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Carrier phase shifted SPWM based on current sourced multi-modular converter for active power filter 被引量:5
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作者 王立乔 李建林 张仲超 《Journal of Zhejiang University Science》 EI CSCD 2004年第7期861-866,共6页
A novel current-source active power filter (APF) based on multi-modular converter with carrier phase-shifted SPWM (CPS-SPWM) technique is proposed. With this technique, the effect of equivalent high switching frequenc... A novel current-source active power filter (APF) based on multi-modular converter with carrier phase-shifted SPWM (CPS-SPWM) technique is proposed. With this technique, the effect of equivalent high switching frequency con-verter is obtained with low switching frequency converter. It is very promising in current-source APF that adopt super-conducting magnetic energy storage component. 展开更多
关键词 current sourced multi-modular converter Carrier phase shifted SPWM Active power filter
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Recent Developments of Modulation and Control for High-Power Current-Source-Converters Fed Electric Machine Systems 被引量:3
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作者 Pengcheng Liu Zheng Wang +2 位作者 Sanmin Wei Yuwen Bo Shaoning Pu 《CES Transactions on Electrical Machines and Systems》 CSCD 2020年第3期215-226,共12页
The pulse-width-modulated(PWM)current-source converters(CSCs)fed electric machine systems can be considered as a type of high reliability energy conversion systems,since they work with the long-life DC-link inductor a... The pulse-width-modulated(PWM)current-source converters(CSCs)fed electric machine systems can be considered as a type of high reliability energy conversion systems,since they work with the long-life DC-link inductor and offer high fault-tolerant capability for short-circuit faults.Besides,they provide motor friendly waveforms and four-quadrant operation ability.Therefore,they are suitable for high-power applications of fans,pumps,compressors and wind power generation.The purpose of this paper is to comprehensively review recent developments of key technologies on modulation and control of high-power(HP)PWM-CSC fed electric machines systems,including reduction of low-order current harmonics,suppression of inductor–capacitor(LC)resonance,mitigation of common-mode voltage(CMV)and control of modular PWM-CSC fed systems.In particular,recent work on the overlapping effects during commutation,LC resonance suppression under fault-tolerant operation and collaboration of modular PMW-CSCs are described.Both theoretical analysis and some results in simulations and experiments are presented.Finally,a brief discussion regarding the future trend of the HP CSC fed electric machines systems is presented. 展开更多
关键词 current source converter(CSC) high power(HP)applications electric machine system inductor–capacitor(LC)resonance low-order current harmonics common-mode voltage(CMV) MODULATION control
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Multilevel Current Source Converters for High Power Medium Voltage Applications 被引量:1
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作者 Li Ding Yujuan Lian Yun Wei Li 《CES Transactions on Electrical Machines and Systems》 2017年第3期306-314,共9页
In medium voltage high power applications,multi-level current source converters(CSCs)are good candidate to increase system power region,reliability,and the quality of output waveforms.Compared with widely researched v... In medium voltage high power applications,multi-level current source converters(CSCs)are good candidate to increase system power region,reliability,and the quality of output waveforms.Compared with widely researched voltage source multi-level converters(MLCs),the current source MLCs have the advantages of inherent short-circuit protection,high power capability and high quality of output current waveforms.The main features of MLCs include reduced harmonics,lower switching frequency and reduced current stress on each device which is a particularly important for high power application with low voltage and high current requirements.This paper conducts a general review of the current research about MLCs in higher power medium voltage application.The different types of parallel structure based MLCs and the modulation methodologies will be introduced and compared.Specifically,the circuit analysis of the common-mode(CM)loop for parallel structures will be conducted,the common-mode voltage(CMV)and circulating current suppression methods developed on the base of multilevel modulations will be addressed. 展开更多
关键词 Circulating current common-mode voltage current source converters multi-level converter high power medium voltage parallel structure
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Bifurcation and chaos in high-frequency peak current mode Buck converter
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作者 常昌远 赵欣 +1 位作者 杨帆 吴承恩 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第7期171-178,共8页
Bifurcation and chaos in high-frequency peak current mode Buck converter working in continuous conduction mode(CCM) are studied in this paper. First of all, the two-dimensional discrete mapping model is established.... Bifurcation and chaos in high-frequency peak current mode Buck converter working in continuous conduction mode(CCM) are studied in this paper. First of all, the two-dimensional discrete mapping model is established. Next, reference current at the period-doubling point and the border of inductor current are derived. Then, the bifurcation diagrams are drawn with the aid of MATLAB. Meanwhile, circuit simulations are executed with PSIM, and time domain waveforms as well as phase portraits in i_L–v_C plane are plotted with MATLAB on the basis of simulation data. After that, we construct the Jacobian matrix and analyze the stability of the system based on the roots of characteristic equations. Finally, the validity of theoretical analysis has been verified by circuit testing. The simulation and experimental results show that,with the increase of reference current I_(ref), the corresponding switching frequency f is approaching to low-frequency stage continuously when the period-doubling bifurcation happens, leading to the converter tending to be unstable. With the increase of f, the corresponding Irefdecreases when the period-doubling bifurcation occurs, indicating the stable working range of the system becomes smaller. 展开更多
关键词 peak current mode Buck converter high frequency bifurcation chaos
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Model Predictive Control Circuit of the Current Source Matrix Converter
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作者 Grzegorz Tadra Zbigniew Fedyczak Pawel Szczesniak 《Journal of Power and Energy Engineering》 2015年第4期136-145,共10页
In this paper, a new predictive control strategy for current source matrix converter (CSMC) is presented. Proposed predictive control strategy allows for creating output voltages with boost type voltage transfer ratio... In this paper, a new predictive control strategy for current source matrix converter (CSMC) is presented. Proposed predictive control strategy allows for creating output voltages with boost type voltage transfer ratio and desired frequency. The description of predictive control circuit of the CSMC is presented. Furthermore the simulation test results to confirm functionality of the proposed control strategy and converter properties under this strategy are shown. 展开更多
关键词 AC/AC Frequency converters current Source Matrix converter Predictive Control Strategy
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Design of small-area and high-efficiency DC-DC converter for 1 T SRAM
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作者 LEE Jae-hyung 金丽妍 +4 位作者 余忆宁 JANG Ji-hye KIM Kwang-il HA Pan-bong KIM Young-hee 《Journal of Central South University》 SCIE EI CAS 2012年第2期417-423,共7页
The direct current-direct current (DC-DC) converter is designed for 1 T static random access memory (SRAM) used in display driver integrated circuits (ICs), which consists of positive word-line voltage (VpwL),... The direct current-direct current (DC-DC) converter is designed for 1 T static random access memory (SRAM) used in display driver integrated circuits (ICs), which consists of positive word-line voltage (VpwL), negative word-line voltage (VinyL) and half-VDD voltage (VHDo) generator. To generate a process voltage temperature (PVT)-insensitive VpWL and VNWL, a set of circuits were proposed to generate reference voltages using bandgap reference current generators for respective voltage level detectors. Also, a VOWL regulator and a VNWL charge pump were proposed for a small-area and low-power design. The proposed VpwL regulator can provide a large driving current with a small area since it regulates an input voltage (VCI) from 2.5 to 3.3 V. The VmvL charge pump can be implemented as a high-efficiency circuit with a small area and low power since it can transfer pumped charges to VNWL node entirely. The DC-DC converter for 1 T SRAM were designed with 0.11 μm mixed signal process and operated well with satisfactory measurement results. 展开更多
关键词 1 T-static random access memory direct current-direct current converter positive word-line voltage negative word-line voltage half- VDb generator
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REALIZATION OF THE RMB'S CONVERTIBILITY UNDER THE CURRENT ACCOUNT AND ITS INFLUENCE
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作者 Ji Caihui 《China's Foreign Trade》 1996年第11期8-9,6,共3页
It was approved by the State Council in I984 to establish economicand technological development zones in 14 coastal port cities tofunction as windows for those cities to attract foreign investment,introduce advanced t... It was approved by the State Council in I984 to establish economicand technological development zones in 14 coastal port cities tofunction as windows for those cities to attract foreign investment,introduce advanced technology and management methods andexpand the export-oriented economy.Since 1992,18 other developmentzones have been approved by the Council,increasing the number ofsuch zones to 32. 展开更多
关键词 REALIZATION OF THE RMB’S CONVERTIBILITY UNDER THE current ACCOUNT AND ITS INFLUENCE WILL US RATE ITS
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RESEARCH & DESIGN OF 60 kW SOFT-SWITCHING PLASMA CONVERTER
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作者 DU Gulping HUANG Shisheng +2 位作者 WANG Zhenmin ZENG Min CHEN Lijun 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第1期28-31,共4页
A novel 60 kW plasma converter with full range soft-switch by utilizing magnetizing inductance, leakage inductance and distributed inductance is introduced. The current injection phase-shifting technique is introduced... A novel 60 kW plasma converter with full range soft-switch by utilizing magnetizing inductance, leakage inductance and distributed inductance is introduced. The current injection phase-shifting technique is introduced into the research of soft-switching plasma converter successfully. The magnetic bias of transformer and the protection of switching parts are solved. The tests state that the power supply has excellent characteristics and higher efficiency and can meet the demand of large power plasma process well. 展开更多
关键词 Soft-switching current injection technique Plasma converter
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AC current automatic calibration using two different TCC designs
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作者 Rasha S M Ali 《Journal of Measurement Science and Instrumentation》 CAS 2013年第3期205-209,共5页
AC currents are automatically calibrated by two different thermal current converter(TCC)designs.The two designs are different in the used number of the thermal-elements(TEs).Consequently they differ in their output el... AC currents are automatically calibrated by two different thermal current converter(TCC)designs.The two designs are different in the used number of the thermal-elements(TEs).Consequently they differ in their output electro motive force(EMF).Studying the effect of changing the output EMF is done in this paper through calibrating AC currents.5 mA and 5 A are accurately calibrated at different frequencies 55 Hz,1 kHz and10 kHz by the two TCCs.A comparison is made between the results to evaluate the effect of the output EMF value on the accuracy and the uncertainty of the low and higher AC current calibration.A LabVIEW program is designed for this accurate automatic calibration to overcome the problems of the manual calibration on the thermal converters. 展开更多
关键词 AC current calibrations thermal current converter (TCC) current shunt resistor electromotive force (EMF) AC-DC difference uncertaintyCLC number:TM930.12 Document code:AArticle ID:1674-8042(2013)03-0205-05
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FCS-MPC for four-switch three-phase AC-DC converters with DC-link capacitor voltage balancing
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作者 MA Wei-jie ZHANG Bao-ge 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2019年第2期150-156,共7页
Due to the decrease in the number of switches for the four-switch three-phase alternating current-direct current(FSTP AC-DC)converter,it can easily lead to DC-link capacitor voltage imbalance and the system stability ... Due to the decrease in the number of switches for the four-switch three-phase alternating current-direct current(FSTP AC-DC)converter,it can easily lead to DC-link capacitor voltage imbalance and the system stability reduction.In order to solve these problems,a finite control set model predictive control(FCS-MPC)for FSTP AC-DC converters with DC-link capacitor voltage balancing is proposed.In this strategy,in order to facilitate calculation,theαβcoordinate system model is established and all voltage vectors are evaluated by establishing a cost function.During the whole process,phase locked loop(PLL)and complex modulation strategy are not required.In the new established cost function,the additional objective term of suppressing capacitor voltage fluctuation is to eliminate effectively the capacitor voltages oscillations and deviations and improve the system reliability.The simulation results show that the proposed strategy can keep the capacitor voltage balancing and has good dynamic and static performance. 展开更多
关键词 finite control set model predictive control(FCS-MPC) four-switch three-phase alternating current-direct current(FSTP AC-DC)converters cost function capacitor voltage balancing
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Design Consideration for High Power Density GaN Buck-Rectifier in ISOP-IPOS Converter based dc Distribution, System
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作者 Yusuke Hayashi Hiroshi Iso +1 位作者 Daisuke Hara Akira Matsumoto 《Journal of Energy and Power Engineering》 2015年第6期574-584,共11页
GaN (gallium nitride) buck-rectifier has been proposed to realize high power density ISOP (input series and output parallel)-IPOS (input parallel and output series) converter-based dc distribution system. The ul... GaN (gallium nitride) buck-rectifier has been proposed to realize high power density ISOP (input series and output parallel)-IPOS (input parallel and output series) converter-based dc distribution system. The ultra-low loss bi-directional switch can be developed by the GaN power device because of the low on-resistance, the high-speed switching behavior and its own device structure. The buck-rectifier using the GaN bi-directional switches has the potential to achieve higher power density than the commonly utilized boost-rectifier. Availability of the GaN-HEMT (high electron mobility transistor) for the buck rectifier has been verified taking the theoretical limit of the on-resistance and the switching loss energy into account. Design consideration for a high power density buck-rectifier has been also conducted and the application effect of the GaN bidirectional switches has been evaluated quantitatively. The ISOP-IPOS converter-based dc (direct current) distribution system takes full advantage of the buck-rectifier and the rectifier using GaN devices contributes to realizing higher power density dc distribution system. 展开更多
关键词 ac (alternate current)-dc converter GaN (gallium nitride) power device power density dc distribution ISOP-IPOStopology.
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Comparisons and Improvements of Key Operating Characteristics of Current Source Converter Applied in HVDC System
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作者 Wenwen Zhang Longlong Chen +4 位作者 Xiaoguang Wei Guangfu Tang Lei Qi Chong Gao Zhiyuan He 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2023年第5期1601-1612,共12页
Because of its controlled power factor and no commutation failure,current source converter(CSC)made up of reverse-blocking IGCTs(RB-IGCTs)offers broad application prospects in the field of HVDC system.Valve voltage an... Because of its controlled power factor and no commutation failure,current source converter(CSC)made up of reverse-blocking IGCTs(RB-IGCTs)offers broad application prospects in the field of HVDC system.Valve voltage and power operating range as the most important operating characteristics should be paid attention to but they are always contradictory.First,the relationship between valve voltage and modulation index is obtained.In particular,valve voltage of converter under the three typical modulation methods is compared,analyzed,and verified.Second,with the help of the independent control strategy and coordinated control strategy of both ends,power operating ranges of the three modulation methods are comprehensively analyzed and compared.Third,in order to solve power coupling at a low active power,the improved coordination control strategy at both ends in this paper is proposed and the relationships among active power,reactive power,DC current and phase angle difference are given in detail.Finally,a 500 kV/3 kA simulation system was built in PSCAD/EMTDC to obtain comparison results of the key operating characteristics of CSC under different modulation methods and the converter can realize unity power operation under random active power after adopting the improved coordinated control strategy,and DC current does not decrease to zero,verifying effectiveness of the coordinated control strategy. 展开更多
关键词 current source converter improved coordinated control strategy reverse-blocking IGCT valve voltage
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Single-ended Fault Detection Scheme Using Support Vector Machine for Multi-terminal Direct Current Systems Based on Modular Multilevel Converter
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作者 Guangyang Zhou Xiahui Zhang +2 位作者 Minxiao Han Shaahin Filizadeh Zhi Geng 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2023年第3期990-1000,共11页
This paper proposes a single-ended fault detection scheme for long transmission lines using support vector machine(SVM)for multi-terminal direct current systems based on modular multilevel converter(MMC-MTDC).The sche... This paper proposes a single-ended fault detection scheme for long transmission lines using support vector machine(SVM)for multi-terminal direct current systems based on modular multilevel converter(MMC-MTDC).The scheme overcomes existing detection difficulties in the protection of long transmission lines resulting from high grounding resistance and attenuation,and also avoids the sophisticated process of threshold value selection.The high-frequency components in the measured voltage extracted by a wavelet transform and the amplitude of the zero-mode set of the positive-sequence voltage are the inputs to a trained SVM.The output of the SVM determines the fault type.A model of a four-terminal DC power grid with overhead transmission lines is built in PSCAD/EMTDC.Simulation results of EMTDC confirm that the proposed scheme achieves 100%accuracy in detecting short-circuit faults with high resistance on long transmission lines.The proposed scheme eliminates mal-operation of DC circuit breakers when faced with power order changes or AC-side faults.Its robustness and time delay are also assessed and shown to have no perceptible effect on the speed and accuracy of the detection scheme,thus ensuring its reliability and stability. 展开更多
关键词 Fault detection short-circuit fault multi-terminal direct current systems based on modular multilevel converter support vector machine(SVM) wavelet transform
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R&D and application of voltage sourced converter based high voltage direct current engineering technology in China 被引量:56
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作者 Guangfu TANG Zhiyuan HE Hui PANG 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2014年第1期1-15,共15页
As a new generation of direct current(DC)transmission technology,voltage sourced converter(VSC)based high voltage direct current(HVDC)has been widely developed and applied all over the world.China has also carried out... As a new generation of direct current(DC)transmission technology,voltage sourced converter(VSC)based high voltage direct current(HVDC)has been widely developed and applied all over the world.China has also carried out a deep technical research and engineering application in this area,and at present,it has been stepped into a fast growing period.This paper gives a general review over China’s VSC based HVDC in terms of engineering technology,application and future development.It comprehensively analyzes the technical difficulties and future development orientation on the aspects of the main configurations of VSC based HVDC system,topological structures of converters,control and protection technologies,flexible DC cables,converter valve tests,etc.It introduces the applicable fields and current status of China’s VSC based HVDC projects,and analyzes the application trends of VSC based HVDC projects both in China and all over the world according to the development characteristics and demands of future power grids. 展开更多
关键词 Voltage sourced converter based high voltage direct current(VSC based HVDC) Two-level converter Modular multi-level converter(MMC) Direct current grid(DC grid)
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高压直流换流站穿墙套管的局部放电在线测量(英文) 被引量:8
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作者 Nathan D.Jacob William M.McDermid Behzad Kordi 《高电压技术》 EI CAS CSCD 北大核心 2011年第11期2636-2642,共7页
An online partial discharge(PD) measurement performed on a high voltage direct current(HVDC) wall bushing successfully identified the presence of internal discharges.The wall bushing is a sulfur hexafluoride gas-insul... An online partial discharge(PD) measurement performed on a high voltage direct current(HVDC) wall bushing successfully identified the presence of internal discharges.The wall bushing is a sulfur hexafluoride gas-insulated bushing,rated for 500 kV dc and terminated on a thyristor-controlled HVDC converter bridge.The measurement of PD within the HVDC station environment is particularly challenging due to the high levels of electromagnetic noise caused by thyristor switching events and external air-corona from the neighboring high-voltage equipment.An additional challenge is the""mixed"voltage stress on the bushing insulation,which has both ac and dc high-voltage components.There are also fast transients during the firing of thyristors in the HVDC conversion process that cause added stress to the insulation.As a result,the analysis and interpretation of PD data for HVDC equipment is more complex;PD pulses may occur in response to the ac,dc,or switching transient voltage stresses.In this paper,an online PD measurement strategy for noise filtering and isolation of PD sources within the bushing are discussed.The PD measurement data is plotted on a phase-resolved diagram where the line supply power cord voltage was used as a reference. The phase-resolved diagram appears to suggest that the fast transients,caused during switching,trigger some PD events.Measurements were also performed with the aid of a modern PD measurement instrument having noise separation capabilities.The findings from the online PD measurements are verified with physical evidence,found after the bushing was removed from service,suggested internal PD had occurred inside the bushing. 展开更多
关键词 partial discharge(PD) electrical insulation high voltage direct current(HVDC) converters SF6 electromagnetic interference electromagnetic coupling
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A DC Chopper Topology to Mitigate Commutation Failure of Line Commutated Converter Based High Voltage Direct Current Transmission 被引量:5
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作者 Chunyi Guo Bo Liu Chengyong Zhao 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2020年第2期345-355,共11页
To reduce the probability of commutation failure(CF)of a line commutated converter based high-voltage direct current(LCC-HVDC)transmission,a DC chopper topology composed of power consumption sub-modules based on thyri... To reduce the probability of commutation failure(CF)of a line commutated converter based high-voltage direct current(LCC-HVDC)transmission,a DC chopper topology composed of power consumption sub-modules based on thyristor full-bridge module(TFB-PCSM)is proposed.Firstly,the mechanism of the proposed topology to mitigate CF is analyzed,and the working modes of TFB-PCSM in different operation states are introduced.Secondly,the coordinated control strategy between the proposed DC chopper and LCC-HVDC is designed,and the voltage-current stresses of the TFB-PCSMs are investigated.Finally,the ability to mitigate the CF issues and the fault recovery performance of LCC-HVDC system are studied in PSCAD/EMTDC.The results show that the probability of CF of LCC-HVDC is significantly reduced,and the performances of fault recovery are effectively improved by the proposed DC chopper. 展开更多
关键词 Line commutated converter based high-voltage direct current(LCC-HVDC)transmission DC chopper power consumption sub-module based on thyristor full-bridge module(TFB-PCSM) commutation failure(CF) fault recovery capability
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Damping controller design based on FO-PID-EMA in VSC HVDC system to improve stability of hybrid power system 被引量:2
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作者 Nima SHAFAGHATIAN Arvin KIANI +2 位作者 Naser TAHERI Zahra RAHIMKHANI Seyyed Saeed MASOUMI 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第2期403-417,共15页
Wind energy sources have different structures and functions from conventional power plants in the power system.These resources can affect the exchange of active and reactive power of the network.Therefore,power system... Wind energy sources have different structures and functions from conventional power plants in the power system.These resources can affect the exchange of active and reactive power of the network.Therefore,power system stability will be affected by the performance of wind power plants,especially in the event of a fault.In this paper,the improvement of the dynamic stability in power system equipped by wind farm is examined through the supplementary controller design in the high voltage direct current(HVDC)based on voltage source converter(VSC)transmission system.In this regard,impacts of the VSC HVDC system and wind farm on the improvement of system stability are considered.Also,an algorithm based on controllability(observability)concept is proposed to select most appropriate and effective coupling between inputs-outputs(IO)signals of system in different work conditions.The selected coupling is used to apply damping controller signal.Finally,a fractional order PID controller(FO-PID)based on exchange market algorithm(EMA)is designed as damping controller.The analysis of the results shows that the wind farm does not directly contribute to the improvement of the dynamic stability of power system.However,it can increase the controllability of the oscillatory mode and improve the performance of the supplementary controller. 展开更多
关键词 hybrid power system high voltage direct current based on voltage source converter(VSC HVDC) fractional order PID(FO-PID)damping controller exchange market algorithm
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A Similarity Comparison Based Pilot Protection Scheme for VSC-HVDC Grids Considering Fault Current Limiting Strategy 被引量:1
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作者 Keao Chen Jinghan He +3 位作者 Meng Li Yong Tang Ming Nie Chenguang Liang 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2023年第4期1305-1315,共11页
In the voltage source converter based high-voltage direct current(VSC-HVDC)grids,fast and reliable protections are the key technologies.The traditional protection schemes are easily affected by fault resistance,line d... In the voltage source converter based high-voltage direct current(VSC-HVDC)grids,fast and reliable protections are the key technologies.The traditional protection schemes are easily affected by fault resistance,line distributed capacitance,etc.Meanwhile,the influence of fault current limiting strategy(FCLS)has not been fully considered.In this paper,the fault characteristics under FCLS and the feasibility of traditional travelling wave protections are analyzed.To improve the reliability and sensibility,a similarity comparison based pilot protection scheme is proposed,which focuses on the relationship between the fault characteristics and the state of the protected transmission line,with the establishment of a precise frequencydependent transmission line model.The criteria based on the similarity comparison calculated by cross-wavelet can identify the fault effectively.Meanwhile,the protection scheme can also endure the influence of error synchronization.Finally,the protection performance is verified in the PSCAD/EMTDC under different fault conditions. 展开更多
关键词 Voltage source converter based high voltage direct current(VSC-HVDC) fault current limiting strategy(FCLS) fault characteristic pilot protection similarity comparison frequency-dependent transmission line model
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Harmonic Transfer Function Based Single-input Single-output Impedance Modeling of LCC-HVDC Systems 被引量:1
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作者 Yang Wang Fei Xia +1 位作者 Ying Wang Xianyong Xiao 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2024年第4期1327-1332,共6页
This study presents a harmonic transfer function(HTF)based single-input single-output(SISO)impedance modeling method.The method converts an HTF from phase domain to sequence domain and then transforms it into an SISO ... This study presents a harmonic transfer function(HTF)based single-input single-output(SISO)impedance modeling method.The method converts an HTF from phase domain to sequence domain and then transforms it into an SISO impedance while preserving the frequency coupling information of different sequences and different harmonics.Applications of this method to a line-commutated converter based high-voltage direct current(LCC-HVDC)system are presented.The results demonstrate the accuracy of the derived SISO impedance,and a truncation-order selection is suggested.The case study shows that the proposed method facilitates simpler impedance measurements and associated stability analysis. 展开更多
关键词 Line-commutated converter based high-voltage direct current(LCC-HVDC) harmonic transfer function(HTF) single-input single-output(SISO)impedance frequency coupling
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High-frequency Resonance Analysis and Impedance Reshaping Control of MMC-HVDC System Based on Frequency Coupling Impedance Model
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作者 Juanjuan Wang Wei Chen +3 位作者 Yuekun Liu Chuang Fu Yunming Ye Junjie Feng 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2024年第2期646-657,共12页
In recent years, high-frequency resonance (HFR) events occurred in several modular multilevel converter based high-voltage direct current (MMC-HVDC) projects. The time delay of an MMC-HVDC system is the critical facto... In recent years, high-frequency resonance (HFR) events occurred in several modular multilevel converter based high-voltage direct current (MMC-HVDC) projects. The time delay of an MMC-HVDC system is the critical factor that induces HFR. The frequency coupling affects the impedance characteristics of an MMC and further deteriorates system stability. Therefore, in this paper, a multi-input multi-output admittance model of an MMC-HVDC system is developed to analyze its frequency characteristics. The effects of current loop, power loop, phase-locked loop, and operating point on the MMC frequency coupling degree are analyzed in detail. Meanwhile, to further suppress HFR in the MMC-HVDC system, an enhanced impedance reshaping control strategy based on the equivalent single-input single-output impedance model is proposed. Finally, the accuracy of the enhanced impedance model and the effectiveness of the impedance reshaping control are verified by electromagnetic transient simulations in PSCAD. 展开更多
关键词 Modular multilevel converter based high-voltage direct current(MMC-HVDC) high-frequency resonance frequency coupling impedance model impedance reshaping control
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