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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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A RESEARCH TO HIGH-PERFORMANCE MULTI-LEVEL SINGLE-PHASE AC/DC POWER FACTOR CORRECT SWITCHING CONVERTER
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作者 Gao Chao 《Journal of Electronics(China)》 2008年第5期716-720,共5页
This letter studies and analyzes the working features of main circuit of tri-level boost Power Factor Correct(PFC) converter and the advantages of tri-level switch converter in aspects of bearing high-voltage of power... This letter studies and analyzes the working features of main circuit of tri-level boost Power Factor Correct(PFC) converter and the advantages of tri-level switch converter in aspects of bearing high-voltage of power components,overall system loss and magnetic component selection based upon the single-level boost PFC switch converter.Besides,relying on the application of mi-croprocessor in power converter technology and DSP(Digital Signal Processing) chip's strong cal-culating capacity,the letter presents the adoption of modified scheme of tri-level boost PFC converter under the control of predictive control algorithm.Moreover,the operating principle and control method are specified,the results of circuit test and analysis are provided and the advantages of pre-dictive control technology-based multi-level boost PFC converter is verified. 展开更多
关键词 MULTI-LEVEL power factor Correct (PFC) Digital Signal Processing (DSP) converter Predictive control MICROPROCESSOR
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An Improved Modulation Strategy for Single-phase Three-level Neutral-point-clamped Converter in Critical Conduction Mode
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作者 Ning Li Yujie Cao +4 位作者 Xiaokang Liu Yan Zhang Ruotong Wang Lin Jiang Xiao-Ping Zhang 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2024年第3期981-990,共10页
Two-level totem-pole power factor correction(PFC)converters in critical conduction mode(CRM)suffer from the wide regulation range of switching frequency.Besides,in highfrequency applications,the number of switching ti... Two-level totem-pole power factor correction(PFC)converters in critical conduction mode(CRM)suffer from the wide regulation range of switching frequency.Besides,in highfrequency applications,the number of switching times increases,resulting in significant switching losses.To solve these issues,this paper proposes an improved modulation strategy for the single-phase three-level neutral-point-clamped(NPC)converter in CRM with PFC.By optimizing the discharging strategy and switching state sequence,the switching frequency and its variation range have been efficiently reduced.The detailed performance analysis is also presented regarding the switching frequency,the average switching times,and the effect of voltage gain.A 2 k W prototype is built to verify the effectiveness of the proposed modulation strategy and analysis results.Compared with the totem-pole PFC converter,the switching frequency regulation range of the three-level PFC converter is reduced by 36.48%and the average switching times is reduced by 45.10%.The experimental result also shows a 1.2%higher efficiency for the three-level PFC converter in the full load range. 展开更多
关键词 Critical conduction mode(CRM) on-board charger switching frequency range switching times power factor correction(PFC) three-level converter
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New DCM Operated Single Phase Bridgeless Cuk Derived Converters for Power Factor Correction
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作者 P. M. Dhanasekaran Parasunath Veena Rajaiah Jeyabharath 《Circuits and Systems》 2016年第9期2176-2188,共13页
This paper presents a power factor corrected (PFC) new bridgeless (BL) Cuk Topologies for low power applications. A BL configuration of Cuk converter is proposed which eliminates the usage of diode bridge rectifier at... This paper presents a power factor corrected (PFC) new bridgeless (BL) Cuk Topologies for low power applications. A BL configuration of Cuk converter is proposed which eliminates the usage of diode bridge rectifier at the front end of the PFC converter, thus reducing the switching and conduction losses coupled with it. This new BL Cuk converter has two semiconductors switches. The current flow during each switching cycle interval of the converter reduces the conduction losses compared to the conventional Cuk PFC converter. It also reduces the input current ripple and Electromagnetic Interference (EMI). The inrush current during the starting period is limited and the input, output currents of the converter are continuous with minimum current ripple. Hence it is preferred mostly compared to other PFC circuits. The proposed topology works in the Discontinuous Conduction Mode (DCM) with simple control circuitry to achieve almost a unity power factor with less distortion in the input AC current. The switching of the power switches is done under zero current. The proposed PFC topologies are theoretically investigated and performance comparisons are made with the conventional rectifiers. The proposed PFC converter is simulated in MATLAB/SIMULINK with Fuzzy Logic Controller (FLC) and results are demonstrated to evaluate the effectiveness of the controller. 展开更多
关键词 Bridgeless (BL) Cuk converter Topology power factor Correction (PFC) Total Harmonic Distortion (THD) Fuzzy Logic controller (FLC)
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DC-Modulated PFC Buck-Type AC/AC Converter for Light Dimming 被引量:3
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作者 罗方林 叶虹 《电工电能新技术》 CSCD 北大核心 2007年第2期6-10,38,共6页
Dimmers are very widely applied in theatres,cinemas,dancing-parties, auditoriums and signal systems.They are usually supplied by single-stage AC/AC converters in the past with voltage regulation technique with the dis... Dimmers are very widely applied in theatres,cinemas,dancing-parties, auditoriums and signal systems.They are usually supplied by single-stage AC/AC converters in the past with voltage regulation technique with the disadvantages of high total harmonic distortion,low power factor and poor power transfer efficiency.This paper introduces a novel method-DC-modulation that implements DC/DC conversion technology into AC/AC converters.The DC-modulated single-stage PFC AC/AC converters effectively improved the power factor up to 0.999 and the power transfer efficiency up to 97.8 %.The experimental results verified our design and calculation.This technique will be widely used in light dimming and other industrial applications. 展开更多
关键词 直流电 交流电 节电措施 灯光亮度
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Control strategy optimization for energy efficiency and harmonic mitigation in multi-series converters
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作者 Ronglin HUANG Peng FU +3 位作者 Yinfeng ZHU Liansheng HUANG Ge GAO Liuwei XU 《Plasma Science and Technology》 SCIE EI CAS CSCD 2019年第9期132-139,共8页
To provide electrical power for the Research System of Superconducting Magnets(RSSMs)including the background field superconducting magnet and the tested superconducting objects,the high power phase-controlled convert... To provide electrical power for the Research System of Superconducting Magnets(RSSMs)including the background field superconducting magnet and the tested superconducting objects,the high power phase-controlled converter will be used to develop the power supply system.However, because of its inner nonlinear feature, the current harmonics and the reactive power are injected into the AC power supply system. To improve the quality of the power supply system for RSSMs, an improved synchronous control strategy is suggested for the superconducting magnet power supply system, which comprises four series-connected six-pulse converters fed by a phase-shifting transformer, respectively. According to the proposed control strategy, the basic unit is two 12-pulse converters and the control method will be changed in terms of loadfluctuations which are represented by the per unit value of converter output voltage. As a result,harmonic is greatly reduced but the power factor is also high. 展开更多
关键词 SUPERCONDUCTING MAGNET power supply control strategy harmonic current multi-series converterS power factor
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A repetitive-PI Current Controller for Boost Single Phase PFC Converters
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作者 Turki Kahawish Hassan 《Energy and Power Engineering》 2011年第2期69-78,共10页
In this paper, the Author presents the theory and application of repetitive proportional integral current con-troller for boost single phase ac-dc converter with power factor correction (PFC). A repetitive controller ... In this paper, the Author presents the theory and application of repetitive proportional integral current con-troller for boost single phase ac-dc converter with power factor correction (PFC). A repetitive controller which is inserted in series with the proportional integral ( PI) controller shows very low crossover distortion of input current, low total harmonic distortion and very low tracking error when is compared with the con-ventional proportional integral controller. Full analysis of proposed controller is given and Matlab/Simulink is used for simulation. The simulation results show the validity of the proposed control method. 展开更多
关键词 BOOST converter UNITY power factor CORRECTION REPETITIVE control
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Efficient Supply Current Control Strategies for Bridgeless Interleaved AC-DC Converter
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作者 R.Sasikala R.Seyezhai 《Computer Systems Science & Engineering》 SCIE EI 2022年第10期175-191,共17页
This paper presents an efficient supply current wave shaping technique for bridgeless interleaved Single Ended Primary Inductor Converter(SEPIC).The SEPIC converter converts an Alternating Current(AC)to Direct Current... This paper presents an efficient supply current wave shaping technique for bridgeless interleaved Single Ended Primary Inductor Converter(SEPIC).The SEPIC converter converts an Alternating Current(AC)to Direct Current(DC)with the boost converter.Power Factor Correction(PFC)is progressively significant to achieve high energy efficiency.The overall system efficiency can be increased as the bridgeless topology has less conduction losses from rectifying bridges.Also,the bridgeless and interleaved techniques are incorporated in this study to achieve better performance.The performance of the system is analyzed on both current control and sensor-less techniques.Different controllers such as Proportional Integral(PI)control,peak current control,Non-Linear Carrier(NLC)control,and sensor-less current control are integrated.All the above controllers are implemented using MATrix LABoratory(MATLAB)/SIMULINK.The performance parameter,namely Power Factor(PF),Total Harmonic Distortion(THD),is computed for both open loop and closed loop condition.The sensor-less current control method is implemented using the DsPIC30F2010 controller.The circuit performance is also verified from the simulation and hardware results.The proposed controller has inbuilt Analog-to-Digital Converter(ADC),Digital-to-Analog Converter(DAC),Pulse Width Modulation(PWM)generator,and provides fast responses. 展开更多
关键词 Light emitting diode power factor correction SEPIC converter current control method sensor-less method fast Fourier transform analysis for input current
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A novel technology for control of variable speed pumped storage power plant 被引量:1
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作者 Seyed Mohammad Hassan Hosseini Mohammad Reza Semsar 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第8期2008-2023,共16页
Variable speed pumped storage machines are used extensively in wind power plant and pumped storage power plant. This paper presents direct torque and flux control(DTFC) of a variable speed pumped storage power plant(V... Variable speed pumped storage machines are used extensively in wind power plant and pumped storage power plant. This paper presents direct torque and flux control(DTFC) of a variable speed pumped storage power plant(VSPSP). By this method both torque and flux have been applied to control the VSPSP. The comparison between VSPSP's control strategies is studied. At the first, a wind turbine with the capacity 2.2 k W and DTFC control strategies simulated then a 250 MW VSPSP is simulated with all of its parts(including electrical, mechanical, hydraulic and its control system) by MATLAB software. In all of simulations, both converters including two-level voltage source converter(2LVSC) and three-level voltage source converter(3LVSC) are applied. The results of applying 2LVSC and 3LVSC are the rapid dynamic responses with better efficiency, reducing the total harmonic distortion(THD) and ripple of rotor torque and flux. 展开更多
关键词 direct torque and flux control(DTFC) two-level three-level voltage source converter(2LVSC&3LVSC) variable speed pumped storage power plant(VSPSP)
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Efficient Single-Stage Bridgeless AC to DC Converter Using Grey Wolf Optimization
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作者 Prema Kandasamy K.Prem Kumar 《Computer Systems Science & Engineering》 SCIE EI 2022年第11期487-499,共13页
Bridgeless single-stage converters are used for efficient(alternative current)AC-(direct current)DC conversion.These converters control generators,likeelectromagnetic meso-and micro-scale generators with low voltage.P... Bridgeless single-stage converters are used for efficient(alternative current)AC-(direct current)DC conversion.These converters control generators,likeelectromagnetic meso-and micro-scale generators with low voltage.Power factorcorrection helps increase the factor of the power supply.The main advantage ofthe power factor is it shapes the input current for increasing the real power of theAC supply.In this paper,a two-switch bridgeless rectifier topology is designedwith a power factor correction capability.For the proposed converter topologyto have good power quality parameters,the closed loop scheme,which uses thegrey wolf optimization(GWO)algorithm,is implemented.The successes ofGWO encourage this research to implement GWO in the topology.The performanceof the proposed topology is analyzed under different load conditions.Simulation is carried out using the MATLAB/Simulink environment,and theresults are compared with those of conventional(proportional integral derivative)PID and(particle swarm optimization)PSO controllers.To validate the simulation results,a 350-W hardware prototype is implemented,and the voltage ripple,efficiency,and power factor under different load conditions are analyzed and tabulated.The comparative study clearly indicates that the proposed convertertopology with a closed loop control scheme using the GWO algorithm improves the power factor to 0.9732 and reduces the voltage ripple to 0.12%with a conversion efficiency of 98.25%. 展开更多
关键词 Bridgeless AC converter DC converter GWO controller power factor
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Power Factor Correction Rectifier with a Variable Frequency Voltage Source in Vehicular Application 被引量:1
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作者 Amine Toumi Mohamed Radhouan Hachicha +1 位作者 Moez Ghariani Rafik Neji 《Intelligent Control and Automation》 2014年第1期1-11,共11页
This paper presents a PFCVF (Power Factor Correction) rectifier that uses a variable frequency source for alternators for electric and hybrid vehicles application. In such application, the frequency of the signal in t... This paper presents a PFCVF (Power Factor Correction) rectifier that uses a variable frequency source for alternators for electric and hybrid vehicles application. In such application, the frequency of the signal in the alternator changes according to the vehicle speed, more over the loading effect on the alternator introduces harmonic currents and increases the alternator apparent power requirements. To overcome these problems and aiming more stability and better design of the alternator, a new third harmonic injection technique is proposed. This technique allows to preserve a good THD (Total Harmonic Distortion) of the input source at any frequency and to decrease losses in semiconductors switches, thereby allowing more stability and reducing the apparent power requirements. A comparative study between the standard and the new technique is made and highlights the effectiveness of the new design. A detailed analysis of the proposed topology is presented and simulations as well as experimental results are shown. 展开更多
关键词 ASYNCHRONOUS Machine control-Oriented Vector of Rotor Flux PWM BOOST converter HARMONIC Injection power factor Correction THREE-PHASE RECTIFIER JUNCTION Temperature
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High Power Density Three-Level Three-Phase AC-DC 48 V Power Supply
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作者 Alessandro Lidozzi Andrea Romanelli Luca Solero 《Journal of Energy and Power Engineering》 2012年第10期1624-1634,共11页
International standards impose several constraints concerning the electric power quality and require that the harmonic content of the line current of grid connected equipment is below assigned limits; for this reason,... International standards impose several constraints concerning the electric power quality and require that the harmonic content of the line current of grid connected equipment is below assigned limits; for this reason, operating of AC-DC converters with high power factor and low line current distortion has become essential. In this paper, the prototypal realization of a three-phase AC-DC 48 V power electronic converter for telecom system supplying is described and experimental testing results are discussed. The main constraints in the power supply design are the required power density of about 900 W per dm3 as well as the absence of the neutral wire in the supply grid. The carried out investigation is focused on three-level power converter configurations which are considered in order to reduce voltage rating of power switches. As a result of the reduced voltage, low on-resistance metal-oxide-semiconductor field effect transistors can be used in the power stage, solution which allows to achieve improved efficiency as well as increased switching frequency with respect to the insulated gate bipolar transistors based two-level topologies. 展开更多
关键词 power electronics power factor correction three-level converter efficiency.
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Unified algorithm of single-phase active AC-DC converters and its applications
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作者 杨喜军 凌志斌 +1 位作者 龚幼民 叶芃生 《Journal of Shanghai University(English Edition)》 CAS 2006年第2期151-153,共3页
This paper discusses a novel boost single-phase active AC-DC converters, named low-end semi-controlled bridge AC-DC converter. By analysis, its topology and principle can be derived from the conventional single-phase ... This paper discusses a novel boost single-phase active AC-DC converters, named low-end semi-controlled bridge AC-DC converter. By analysis, its topology and principle can be derived from the conventional single-phase power factor corrector ( PFC). But it has also some differences, such as power device positions, inductor type, input voltage waveform detection and induction current detection, so its design is also different. The converter is implemented by employing two current detection approaches, i.e., current transformer detection and shunt resistor detection. Consequently, it can provide a steady DC output voltage with a low voltage ripple, approximately unitary input power factor and 2.5 kW output power. The experimental results show validity of the theoretical analysis. 展开更多
关键词 single-phase active AC-DC converter low-end semi-controlled bridge power factor correction (PFC).
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三电平辅助变流器寿命优化控制 被引量:2
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作者 向超群 杜京润 +3 位作者 孙士杰 李佳怡 范子寅 于天剑 《铁道科学与工程学报》 EI CAS CSCD 北大核心 2024年第1期328-341,共14页
辅助变流系统是动车组车辆上关键的电气组成部分,主要为空调机组、风机、照明等交流负载提供稳定的三相电源。结温是影响动车组三电平辅助变流器IGBT(Insulated-gate Bipolar Transistor)模块寿命的主要因素。为了提高动车组三电平中点... 辅助变流系统是动车组车辆上关键的电气组成部分,主要为空调机组、风机、照明等交流负载提供稳定的三相电源。结温是影响动车组三电平辅助变流器IGBT(Insulated-gate Bipolar Transistor)模块寿命的主要因素。为了提高动车组三电平中点钳位(Neutral-Point Clamped,NPC)型辅助变流器寿命,提出一种降低结温的模型预测电流控制(Model Predictive Current Control,MPCC)策略。首先,考虑传统MPCC在每个采样周期需要代入27个电压矢量循环计算,计算量较大,因此将三电平基本电压矢量划分在间隔60°的6个扇区中,通过计算电压矢量在两相静止坐标下的相角,进而判断参考电压矢量所处扇区,将备选矢量数目从27缩减至10,减少了计算量;其次,传统MPCC直接应用于动车组辅助变流器会使IGBT模块的结温较高,老化速度加快,对变流器安全稳定运行产生不可预测的损害,本文对IGBT模块的开关损耗和导通损耗进行近似等效,得到了和集射极电压、集电极电流相关的功率损耗因子。通过预测每相电流的方向,进而预测IGBT模块的开关和导通情况,动态加入功率损耗因子,并在代价函数中约束每相IGBT及其续流二极管(Free Wheeling Diode,FWD)的功率损耗,使得最优电压矢量在降低功率损耗的同时保证一定的控制性能。通过仿真与实验验证,本文所提方法相比传统MPCC策略降低了功率器件的结温,提高了变流器寿命。 展开更多
关键词 三电平中点钳位型辅助变流器 功率损耗 模型预测电流控制 损耗因子 变流器寿命
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一类三电平伪图腾柱无桥PFC变换器 被引量:1
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作者 马辉 徐甜川 +3 位作者 范李平 卢云 陈曦 黄悦华 《中国电机工程学报》 EI CSCD 北大核心 2024年第2期691-703,I0022,共14页
针对传统二极管钳位型三电平整流器在单相电源前级功率校正(power factor correction,PFC)电路应用场景下全控开关器件数量多的问题,该文基于3种传统无桥PFC电路进行三电平电路拓扑设计,提出一类三电平伪图腾柱PFC电路(single-phase thr... 针对传统二极管钳位型三电平整流器在单相电源前级功率校正(power factor correction,PFC)电路应用场景下全控开关器件数量多的问题,该文基于3种传统无桥PFC电路进行三电平电路拓扑设计,提出一类三电平伪图腾柱PFC电路(single-phase three-level pseudo totem-pole PFC circuit,STPT-PFC),该类三电平PFC具有双电感支路桥臂,两者相互配合工作为输入电流提供路径,在正负半周两电感支路桥臂工作于不同模态可有效降低分别流过两电感的电流;基于该类PFC的一个代表性电路,从工作电流路径过程、关键波形和调制脉冲分配等方面对其进行工作原理分析,并对其它电路进行电路特性总结,推导桥臂对地电压电平特性与开关脉冲分配的数学关系式。另外,该类STPT-PFC共有5种结构,结合该类STPT-PFC结构特点,提出统一区间判断条件的双层载波调制技术,该类STPT-PFC具有相同开关器件不同拓扑结构可采用同一调制方案的特点,便于该类调制技术移植。最后,基于STPT-PFC-I电路设计1台额定功率1 kW、直流输出电压400 V的实验样机,从稳态及动态两方面进行实验分析,实验结果验证所提出一类三电平伪图腾柱PFC电路的可行性和三电平统一双层调制方法的有效性。 展开更多
关键词 三电平变换器 无桥功率校正电路 三电平双层载波调制技术
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基于无差拍预测算法的双向隔离型AC-DC矩阵变换器高动态电流控制策略 被引量:1
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作者 梅杨 张家奇 《高电压技术》 EI CAS CSCD 北大核心 2024年第3期1090-1099,共10页
针对双向隔离型AC-DC矩阵变换器采用传统双闭环控制策略存在的控制参数多、整定困难等问题,提出了一种基于无差拍预测算法的高动态电流控制策略,通过引入无差拍预测算法对网侧电流进行控制,以减少控制器参数,消除数字控制时延。考虑到... 针对双向隔离型AC-DC矩阵变换器采用传统双闭环控制策略存在的控制参数多、整定困难等问题,提出了一种基于无差拍预测算法的高动态电流控制策略,通过引入无差拍预测算法对网侧电流进行控制,以减少控制器参数,消除数字控制时延。考虑到算法中电压电流检测量众多,故采用输入电压观测器以降低检测成本,减小采样误差的影响。变换器采用后级单重移相的调制方法来协调配合无差拍预测算法,其中参考输入电流指令与移相角为双射函数关系,简单易实现。仿真和实验结果表明:采用所提控制策略可以实现网侧电流正弦,功率因数接近于1;直流侧电压稳定,电流纹波率小于1%;直流电流在参考值突变时,跟踪快速且无超调、无振荡;同时,在变换器功率正向传输、反向传输以及正反向切换过程中,采用所提控制策略相比于传统的双闭环控制策略,电流动态调节时间分别缩短了69%、85%、67%。由此证明所提控制策略可以保证变换器良好的输入输出性能,并且相比于传统的双闭环控制策略在切换过程中动态性能得到显著提升。 展开更多
关键词 矩阵变换器 预测控制 控制器参数 无差拍预测算法 功率因数 动态性能
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基于PFC电路直流纹波抑制的二阶自适应滑模控制器设计
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作者 马辉 曾雨涵 +3 位作者 苗桂喜 曾斌 卢云 黄悦华 《中国电机工程学报》 EI CSCD 北大核心 2024年第13期5258-5268,I0020,共12页
文中提出一种背靠背型中性点钳位式(back-to-back neutral point clamped,BT-NPC)功率因数校正(power factor correction,PFC)电路,并设计二阶自适应滑模控制方法用于提高电路鲁棒性与降低电流谐波含量。首先,分析所提三电平PFC电路工... 文中提出一种背靠背型中性点钳位式(back-to-back neutral point clamped,BT-NPC)功率因数校正(power factor correction,PFC)电路,并设计二阶自适应滑模控制方法用于提高电路鲁棒性与降低电流谐波含量。首先,分析所提三电平PFC电路工作特性,推导该电路的等效模型及其模态扰动,并分析模态扰动量对其工作特性的影响;然后,结合高阶滑模理论与自适应控制两者的优点,设计二阶自适应滑模控制器,既使电路具有变结构控制的良好鲁棒性,又能最大限度的减小控制震颤。同时,基于电流带宽分析,设计比例谐振控制器补偿交流电流与工频相位,并设计基于扩张状态观测器的直流电压采样滤波方法,用于消除二倍频纹波造成的电流谐波影响。最后,基于BT-NPC电路,搭建220 V/50 Hz、1 kW/400 V的实验样机,实验结果验证所提变换器的可行性和控制方法的有效性。 展开更多
关键词 功率因数校正变换器 扩张状态观测器 滑模控制器 纹波抑制
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结温导向的牵引变流器寿命优化控制
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作者 向超群 杜京润 +2 位作者 陈春阳 李佳怡 成庶 《铁道学报》 EI CAS CSCD 北大核心 2024年第9期45-56,共12页
结温是影响绝缘栅双极型晶体管(IGBT)寿命的主要因素。为了提高地铁两电平牵引变流器寿命,提出一种降低结温的异步牵引电机双矢量模型预测转矩控制(DVMPTC)策略。将传统DVMPTC的第二个电压矢量选择范围缩小在与第一个电压矢量不切换或... 结温是影响绝缘栅双极型晶体管(IGBT)寿命的主要因素。为了提高地铁两电平牵引变流器寿命,提出一种降低结温的异步牵引电机双矢量模型预测转矩控制(DVMPTC)策略。将传统DVMPTC的第二个电压矢量选择范围缩小在与第一个电压矢量不切换或仅切换一次的范围,降低IGBT开关损耗的同时减小系统计算量;在代价函数中约束IGBT及其反并联二极管的损耗,动态加入损耗因子,并赋予权重系数,使得最优矢量的选择兼顾控制性能与降低损耗。通过仿真分析,本文所提方法相较于传统基于分段调制算法的直接转矩控制策略,降低了结温及其波动,提高了牵引变流器寿命。 展开更多
关键词 两电平牵引变流器 IGBT模块结温 双矢量模型预测转矩控制 损耗因子 牵引变流器寿命
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高频链矩阵变换器直接功率反步控制策略
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作者 魏业文 白文静 李明 《电机与控制学报》 EI CSCD 北大核心 2024年第7期55-64,共10页
针对高频链矩阵变换器(HFLMC)电路前后级耦合导致系统动态性能和鲁棒性降低的问题,提出一种基于直接功率的非线性反步控制策略(BS-DPC)。首先,建立HFLMC非线性数学模型和有功、无功功率动态模型,分析双极性电流空间矢量调制策略;然后,... 针对高频链矩阵变换器(HFLMC)电路前后级耦合导致系统动态性能和鲁棒性降低的问题,提出一种基于直接功率的非线性反步控制策略(BS-DPC)。首先,建立HFLMC非线性数学模型和有功、无功功率动态模型,分析双极性电流空间矢量调制策略;然后,在考虑系统不确定性情况下引入2个解耦控制分量,设计直流输出电流和无功功率反步控制器,实现电池不同工况下输出电流参考值的快速跟踪控制;最后,根据李雅普诺夫稳定性理论证明HFLMC闭环系统全局渐进稳定性,并对比传统PI直接功率控制和BS-DPC策略。仿真和实验结果表明,所提BS-DPC策略控制HFLMC提高了输出电流的动态性能和电网波动及直流滤波电感变化下的鲁棒性,响应时间减少了约78%,网侧THD降低了0.98%。 展开更多
关键词 高频链矩阵变换器 双极性电流空间矢量调制 PI直接功率控制 直接功率反步控制 动态响应 鲁棒性
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Harmonic influence analysis of unified power flow controller based on modular multilevel converter 被引量:15
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作者 Yubo YUAN Peng LI +3 位作者 Xiangping KONG Jiankun LIU Qun LI Ye WANG 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2016年第1期10-18,共9页
The unified power flow controller(UPFC)based on modular multilevel converter(MMC) is the most creative flexible ac transmission system(FACTS) device. In theory, the output voltage of the series MMC in MMCUPFC can be r... The unified power flow controller(UPFC)based on modular multilevel converter(MMC) is the most creative flexible ac transmission system(FACTS) device. In theory, the output voltage of the series MMC in MMCUPFC can be regulated from 0 to the rated value. However,there would be relatively large harmonics in the output voltage if the voltage modulation ratio is small. In order to analyze the influence of MMC-UPFC on the harmonics of the power grid, the theoretical calculation method and spectra of the output voltage harmonics of MMC are presented. Subsequently, the calculation formulas of the harmonics in the power grid with UPFC are proposed. Based on it, the influence of UPFC on the grid voltage harmonics is evaluated, when MMC-UPFC is operated with different submodular numbers and voltage modular ratios. Eventually, the proposed analysis method is validated using digital simulation. The study results would provide guideline for the design and operation of MMC-UPFC project. 展开更多
关键词 Unified power flow controller(UPFC) modular multilevel converter(MMC) Harmonic features Voltage modulation ratio Submodular number
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