期刊文献+
共找到25篇文章
< 1 2 >
每页显示 20 50 100
THREE-PHASE BRIDGE INVERTER FOR 9kW DOUBLY SALIENT PERMANENT MAGNET MOTOR
1
作者 黄伟君 秦海鸿 +1 位作者 王慧贞 严仰光 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2006年第1期27-33,共7页
The three-phase bridge inverter is used as the converter topology in the power controller for a 9 kW doubly salient permanent magnet (DSPM) motor. Compared with common three-phase bridge inverters, the proposed inve... The three-phase bridge inverter is used as the converter topology in the power controller for a 9 kW doubly salient permanent magnet (DSPM) motor. Compared with common three-phase bridge inverters, the proposed inverter works under more complicated conditions with different principles for special winding back EMFs, position signals of hall sensors, and the given mode of switches. The ideal steady driving principles of the inverter for the motor are given. The working state with asymmetric winding back EMFs, inaccurate position signals of hall sensors, and the changing input voltage is analyzed. Finally, experimental results vertify that the given anal ysis is correct. 展开更多
关键词 doubly salient permanent magnet motor three-phase bridge inverter winding back EMF position signal of hall sensor input voltage
下载PDF
A new three-phase 5-level current-source inverter 被引量:4
2
作者 BAO Jian-yu BAI Zhi-hong +1 位作者 WANG Qing-song ZHANG Zhong-chao 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第12期1973-1978,共6页
The new three-phase 5-level current-source inverter (CSI) proposed in this paper was developed by connecting three separate single-phase 5-level CSIs in series, and its operational principle was analyzed. There are tw... The new three-phase 5-level current-source inverter (CSI) proposed in this paper was developed by connecting three separate single-phase 5-level CSIs in series, and its operational principle was analyzed. There are two major problems existing in current-source multilevel inverters, one is the complex PWM control method (2-logic to 3-logic conversion), and the other is the problem of current-unbalance between different levels. A simple current-balance control method via DC current feedback is applied in each single-phase 5-level CSI cell to implement the current-balance control between different levels. And to reduce the output current harmonics, POD PWM control technique was used. Simulation and experimental results showed that this new three-phase 5-level CSI topology operates correctly. 展开更多
关键词 three-phase Current-source inverter (CSI) 5-level HARMONICS POD PWM
下载PDF
Control strategy of LCL-type three-phase photovoltaic grid connected inverter 被引量:2
3
作者 WANG Si-hua WANG Jin-qiang 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2019年第3期254-265,共12页
The grid-connected inverter with LCL filter has the ability of easily attenuating high-frequency current harmonics. However, its suppression effect on the background harmonics in grid voltage is limited. A control str... The grid-connected inverter with LCL filter has the ability of easily attenuating high-frequency current harmonics. However, its suppression effect on the background harmonics in grid voltage is limited. A control strategy is presented, which is composed of an inner loop of capacitor current feedforward, an outer loop of grid-current feedforward and feedforward of grid voltage. The limitations and steps of parameters design for LCL filter are analyzed. Meanwhile, the capacitor current loop is employed to damp the resonant peak caused by the LCL filter and enhance the stability. The properties of different controllers are analyzed and compared, thereinto quasi-proportional-rasonant (PR) controller realizes the control with zero steady-state error of AC variables in static coordinates. In order to suppress the current distortion effected by the background harmonics in grid voltage, the feed-forward function is calculated for the grid-connected inverter with an LCL filter. After simplifying the block diagram, a full-feedforward control strategy for grid voltage is proposed. Theoretical analysis and Matlab/Simulink simulation results show that the proposed method has the advantages of high steady accuracy, fast dynamic response and strong robustness. 展开更多
关键词 three-phase grid-connected inverter LCL filter active damping quasi-proportional-resonant (PR) control full-feedforward of grid voltages
下载PDF
The Research of Three-phase Boost/Buck-boost DC-AC Inverter
4
作者 Xiangli Li Zhaoyang Yan +1 位作者 Yanni Gao Hanhong Qi 《Energy and Power Engineering》 2013年第4期906-913,共8页
This paper presents a new inverter based on three-phase Boost/Buck-boost single-stage inverter. The basic configuration of the new topology and their fundamental principle are firstly introduced, the method of design ... This paper presents a new inverter based on three-phase Boost/Buck-boost single-stage inverter. The basic configuration of the new topology and their fundamental principle are firstly introduced, the method of design double-loop controller and sliding mode controller are clarified, analyzed and compared in the following. Finally the validity and feasibility of the new topology are tested by simulation. The results indicate that regulation of the voltage transfer ratio and output frequency can be realized optionally by the new converter, furthermore the harmonic distortion of waveform is low. So the inherent drawback of low voltage transfer ratio of traditional converter is effectively settled. This study may provide inspiration for further engineering application. 展开更多
关键词 three-phase BOOST SINGLE-STAGE inverter three-phase BUCK-BOOST SINGLE-STAGE inverter Double-loop CONTROLLER Sliding Mode CONTROLLER
下载PDF
The Control Technology Research of the Z-source Three-phase Four-bridge Arm Inverter
5
作者 Xiangli Li Zhaoyang Yan +2 位作者 Keke Pan Chenghao Ma Hanhong Qi 《Energy and Power Engineering》 2013年第4期733-739,共7页
Z-source inverter can boost the voltage of the DC-side, allow the two switches of the same bridge arm conducting at the same time and it has some other advantages. The zero-sequence current flows through the fourth le... Z-source inverter can boost the voltage of the DC-side, allow the two switches of the same bridge arm conducting at the same time and it has some other advantages. The zero-sequence current flows through the fourth leg of the three-phase four-leg inverter so the three-phase four-leg inverter can work with unbalanced load. This paper presents a Z-source three-phase four-leg inverter which combines a Z-source network with three-phase four-leg inverter. The circuit uses simple SPWM modulation technique and the fourth bridge arm uses fully compensated control method. The inverter can maintain a symmetrical output voltage when the proposed scheme under the unbalanced load. 展开更多
关键词 Z-SOURCE inverter three-phase FOUR-LEG inverter Unbalanced Load Imbalanced VOLTAGE
下载PDF
The improved PAC method for a three-phase PWM grid-connected inverter
6
作者 李杰 马祎炜 +2 位作者 陈国呈 王得利 俞俊杰 《Journal of Shanghai University(English Edition)》 CAS 2008年第6期560-564,共5页
In this paper, a vector regulating principle of the phase and amplitude control PAC method for three-phase grid-connected inverters is presented.To solve the problem of heavy inrush current and slow dynamic response w... In this paper, a vector regulating principle of the phase and amplitude control PAC method for three-phase grid-connected inverters is presented.To solve the problem of heavy inrush current and slow dynamic response when system starts up, the starting voltage prediction control and the current feed-forward control are proposed and used, which improve the dynamic performance of the system in the PAC.The experimental results carried out on a three-phase grid-connected inverter proved the validity of the proposed method. 展开更多
关键词 three-phase pulse width modulation (PWM) grid-connected inverter phase and amplitude control (PAC) starting voltage prediction control current feed-forward control
下载PDF
Finite Set-Model Predictive Current Control of Three-Phase Voltage Source Inverter for RES (Renewable Energy Systems) Applications
7
作者 Ali Almaktoof Atanda Raji Tariq Kahn 《Journal of Energy and Power Engineering》 2014年第4期749-756,共8页
This paper focuses on a combination of three-phase VSI (voltage source inverter) with a predictive current control to provide an optimized system for three-phase inverters that control the load current. A FS-MPC (f... This paper focuses on a combination of three-phase VSI (voltage source inverter) with a predictive current control to provide an optimized system for three-phase inverters that control the load current. A FS-MPC (finite set-model predictive control) strategy for a three-phase VSI for RES (renewable energy systems) applications is implemented. The renewable energy systems model is used in this paper to investigate the system performance when power is supplied to resistive-inductive load. With three different cases, the evaluation of the system is done. Firstly, the robustness of control strategy under variable DC-Link is done in terms of the THD (total harmonic distortion). Secondly, with one prediction step, the system performance is tested using different sampling time, and lastly, the dynamic response of the system with step change in the amplitude of the reference is investigated. The simulations and result analyses are carried out using Matlab/Simulink to test the effectiveness and robustness of FS-MPC for two-level VSI with AC filter for resistive-inductive load supplied by a renewable energy system. 展开更多
关键词 Finite set-model predictive control three-phase voltage source inverter renewable energy system application AC filter Matlab/Simulink.
下载PDF
Topological Comparison and Analysis of Medium-voltage and High-power Direct-linked PV Inverter 被引量:14
8
作者 Xing Zhang Mingda Wang +3 位作者 Tao Zhao Wang Mao Yuhua Hu Renxian Cao 《CES Transactions on Electrical Machines and Systems》 CSCD 2019年第4期327-334,共8页
Among all the renewable energy sources,the installed capacity of solar power generation is the fastest growing in recent years,so photovoltaic(PV)power generation still has great market potential.Compared with low-pow... Among all the renewable energy sources,the installed capacity of solar power generation is the fastest growing in recent years,so photovoltaic(PV)power generation still has great market potential.Compared with low-power systems,large-scale PV systems are more commercially attractive,because they can reduce the cost of the system per watt.The PV inverters with centralized and string structure have been applied in large-scale PV plant,but it is difficult to further increase the voltage and power levels for a single converter.In addition,the line-frequency isolation transformer requires a large amount of materials and has a large volume and weight.Therefore,it is a current trend for large-scale PV system to increase the voltage and power levels to directly connect to the medium-voltage power grid.Based on this,this paper investigates and compares several topologies of PV inverters without line-frequency transformer,including the MMC structure and the three-phase cascaded H-bridge(CHB)structure,which are able to directly connect to the 35kV medium-voltage power grid,and can not only make the voltage and power levels higher,but also further reduce the cost and volume of the whole system. 展开更多
关键词 Direct-linked PV inverter large-scale PV system MMC structure three-phase CHB structure.
下载PDF
Robust Dichotomy Solution-Based Model Predictive Control for the Grid-Connected Inverters with Disturbance Observer 被引量:5
9
作者 Huanyue Liao Xin Zhang Zhijun Ma 《CES Transactions on Electrical Machines and Systems》 CSCD 2021年第2期81-89,共9页
This paper proposes a robust dichotomy-based model predictive control(DS-MPC)with a fixed switching frequency for the grid-connected inverter(GCI).The proposed fast dichotomy algorithm can select and deduce the optima... This paper proposes a robust dichotomy-based model predictive control(DS-MPC)with a fixed switching frequency for the grid-connected inverter(GCI).The proposed fast dichotomy algorithm can select and deduce the optimal voltage vector dynamically through the space vector plane.Therefore,the proposed DS-MPC strategy could ensure dynamic performance and steady-state performance as well.Also,the current control robustness can be improved through DS-MPC with disturbance observer(DO)based on the extended Kalman filter(EKF).The novelty of this control is that the current control with fast dynamic response can be realized in the weak grid,even if the grid voltages are greatly distorted.Simulation and hardware experiments on the weak grid validate the effectiveness of the proposed DS-MPC with the EKF observer approach. 展开更多
关键词 Dichotomy solution-based model predictive control(DS-MPC) three-phase grid-connected inverter(GCI) weak grid voltage vector dichotomy
下载PDF
Dual-loop Control Strategy for Grid-connected Inverter with LCL Filter
10
作者 Qiubo Peng Hongbin Pan +1 位作者 Yong Liu Lidan Xiang 《Energy and Power Engineering》 2013年第4期97-101,共5页
As to the concrete topology of three-phase LCL type grid-connected inverter with damping resistance, mathematical model was deduced in detail, using method of equivalent transformation to the structure diagram, dampin... As to the concrete topology of three-phase LCL type grid-connected inverter with damping resistance, mathematical model was deduced in detail, using method of equivalent transformation to the structure diagram, damping resistance was virtualized, mathematical model under the DQ frame that can realize decoupling control was established, a dual-loop control strategy for grid-connected inverter with LCL filter was proposed, the system stability was analyzed and the design method of controller was given. The proposed method overcame the flaws of loss increase, efficiency reduce and cost increase which were caused by damping resistance in LCL type grid-connected inverter, the system efficiency and power supply quality of the output were improved. Feasibility and effectiveness of the new method were validated by simulation and experimental results. 展开更多
关键词 Virtual DAMPING LCL Filter three-phase GRID-CONNECTED inverter DECOUPLING Control
下载PDF
Research on a New Control Strategy of Three Phase Inverter for Unbalanced Loads
11
作者 Wenhua HU Weiming Ma Chunxi LIU 《Journal of Electromagnetic Analysis and Applications》 2010年第1期39-44,共6页
One of the very important functions of three-phase inverter is to maintain the symmetric three-phase output voltage when the three-phase loads are unbalanced. Although the traditional symmetrical component decomposing... One of the very important functions of three-phase inverter is to maintain the symmetric three-phase output voltage when the three-phase loads are unbalanced. Although the traditional symmetrical component decomposing and superimpose theory can keep the voltage balance through compensating the positive-, negative- and zero-sequence components of the output voltage of inverter, however, this method is time-consuming and not suitable for control. Aiming at high power medium frequency inverter source, a P+Resonant (Proportion and Resonant) controller which ensured a balanced three phase output voltage under unbalanced load is proposed in this paper. The regulator was proved to be applicable to both three-phase three-wire system and three-phase four-wire system and developed two methods of realization. The simulation results verified that this method can suppressed effectively the output voltage distorted caused by the unbalanced load and attained a high quality voltage waveforms. 展开更多
关键词 three-phase inverter Unbalanced Load the three-phase OUTPUT Voltage SYMMETRIC Medium Frequency P+Resonant CONTROLLER
下载PDF
SVM strategy and analysis of a three-phase quasi-Z-source inverter with high voltage transmission ratio
12
作者 CHEN DaoLian ZHAO JiaWei QIN ShuRan 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2023年第10期2996-3010,共15页
Herein,we propose a novel three-phase quasi-Z-source inverter with a high voltage transmission ratio to address challenges such as high switching loss and sizeable magnetic components in the basic quasi-Z-source inver... Herein,we propose a novel three-phase quasi-Z-source inverter with a high voltage transmission ratio to address challenges such as high switching loss and sizeable magnetic components in the basic quasi-Z-source inverter.The proposed circuit topology,control strategy,and related analysis are presented.The circuit topology of the inverter comprises a quasi-Z-source network with an integrated magnetic inductor,an active clamp circuit,a three-phase inverter bridge,and an output LC filter,all of which are connected in series.An improved 12-sector space vector modulation scheme is proposed based on the root-mean-square value of the voltage and the instantaneous value of the current.Furthermore,analyses of the inverter voltage transmission ratio,resonant process,and parametric design guidelines for integrated magnetic inductor and zero-voltage switching conditions are presented.Experimental results on a 1-kVA prototype inverter demonstrate that the proposed inverter exhibits a higher transmission ratio and efficiency than existing inverters;thus,the proposed inverter would have broad prospects in low-voltage DC-AC applications. 展开更多
关键词 quasi-Z-source inverter three-phase inverter ZERO-VOLTAGE-SWITCHING magnetically integrated inductor space vector modulation
原文传递
Practical Implementation of Embedded Controlled Reduced Switch Z-Source Inverter-Fed Induction Motor Drive
13
作者 K. Srinivasan T. Vijayakumar 《Circuits and Systems》 2016年第9期2189-2195,共8页
A cost-effective component minimized embedded controlled Z-source inverter for induction motor drive is presented. The proposed topology combines the advantages of a traditional four-switch three-phase inverter with t... A cost-effective component minimized embedded controlled Z-source inverter for induction motor drive is presented. The proposed topology combines the advantages of a traditional four-switch three-phase inverter with the advantages of the z impedance network (two inductors in series and two X connected capacitors). This new topology, besides the self-boost property, has low switch count and it can operate as a buck-boost inverter. As a result, the new embedded controlled reduced switch Z-source inverter system provides ride through capability during voltage sags, reduces line harmonics, improves power factor, reliability and extends output voltage range. Analysis, simulation and experiment result will be presented to demonstrate these new features. 展开更多
关键词 Embedded Controller Harmonic Distortion Four-Switch three-phase inverter Z-Source inverter
下载PDF
Microcontroller-Based Variable Speed Drive for Three-Phase Induction Motor in Cooling Applications
14
作者 Kondapalli Siva Rama Rao Lee Teng Hong 《Journal of Energy and Power Engineering》 2012年第4期656-662,共7页
This paper presents an electronic VSD (variable speed drive) for three-phase IM (induction motor) using a microcontroller. The VSD is designed for cooling applications where the 1M is coupled to a cooling fan. The... This paper presents an electronic VSD (variable speed drive) for three-phase IM (induction motor) using a microcontroller. The VSD is designed for cooling applications where the 1M is coupled to a cooling fan. The drive receives temperature feedback from objects to be cooled and output a corresponding frequency to the IM. A prototype of the VSD is constructed to control a 175 W, four pole, squirrel cage three-phase IM. The heart of the control circuit is a low-cost microchip's PICI6F777 microcontroller which is programmed using C language to generate variable frequency SPWM (sinusoidal pulse width modulation) switching signals. These switching signals are fed to an 1GBT inverter. The VSD constructed can be switched between two modes of speed control" automatic temperature-controlled mode and manual user-controlled mode. Cost savings using the prototype are demonstrated. 展开更多
关键词 IGBT inverter PIC microcontroller SPWM three-phase induction motor variable speed drive.
下载PDF
Highly efficient three-phase grid-connected parallel inverter system 被引量:4
15
作者 Evren ISEN Ahmet Faruk BAKAN 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2018年第5期1079-1089,共11页
In this paper, a new three-phase grid-connected inverter system is proposed. The proposed system includes two inverters. The main inverter, which operates at a low switching frequency, transfers active power to the gr... In this paper, a new three-phase grid-connected inverter system is proposed. The proposed system includes two inverters. The main inverter, which operates at a low switching frequency, transfers active power to the grid. The auxiliary inverter processes a very low power to compensate for the grid current ripple. Thus, no active power is processed by the auxiliary inverter. The goal is to produce a grid current with a low total harmonic distortion(THD) and to obtain the highest efficiency from the inverter system. The main inverter is controlled via a space-vector pulse-width modulation owing to its optimum switching pattern, and the auxiliary inverter is controlled via a hysteresis current-control technique owing to the technique's fast dynamic response. The proposed system is analyzed in terms of different DC-link voltage, switching frequency,and filter inductance values. The optimum system parameters are selected that provide a THD value of less than 5%.A prototype inverter system at a 10 kW output power has been implemented. The main inverter operates at a 3 kHz switching frequency, and the auxiliary inverter compensates for the grid-current ripple. In total, a THD of 4.33%and an efficiency of 97.86% are obtained using the proposed inverter system prototype. 展开更多
关键词 Active filter inverter efficiency RIPPLE CANCELLATION three-phase GRID-CONNECTED inverter
原文传递
Global synchronous discontinuous pulse width modulation method with fast calculation capability for distributed three-phase inverters 被引量:3
16
作者 Tao XU Ran WEI +1 位作者 Ke ZHOU Feng GAO 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2016年第1期103-112,共10页
When multiple distributed converters are integrated, the high frequency harmonics will randomly accumulate at the point of common coupling(PCC). This paper proposes a new fast global synchronous discontinuous pulse wi... When multiple distributed converters are integrated, the high frequency harmonics will randomly accumulate at the point of common coupling(PCC). This paper proposes a new fast global synchronous discontinuous pulse width modulation(GSDPWM) method of threephase inverters to effectively attenuate the high frequency current harmonics at PCC. Firstly, the basic principle and the realization method of GSDPWM for three-phase inverters are explained, which can be employed for different modulation types. Then a fast calculation method,which can equally derive the minimized total harmonic distortion(THD) of total current, is proposed to release the calculation burden. Finally, MATLAB simulations and experimental results are presented to verify the performance of GSDPWM. 展开更多
关键词 Global synchronous pulse width modulation three-phase inverters High frequency harmonics Discontinuous pulse width modulation
原文传递
Optimized damping for LCL filters in three-phase voltage source inverters coupled by power grid 被引量:2
17
作者 Meng HUANG Jianjun SUN +1 位作者 Yu PENG Xiaoming ZHA 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2017年第4期642-651,共10页
The application of LCL filters has become popular for inverters connected to the power grid due to their advantages in harmonic current reductions. However,the power grid in a distribution system is non-ideal, present... The application of LCL filters has become popular for inverters connected to the power grid due to their advantages in harmonic current reductions. However,the power grid in a distribution system is non-ideal, presenting itself as a voltage source with significant impedance. This means that an inverter using an LCL filter may interact with other grid-connected inverters via the nonideal grid. In this paper, damping optimization of LCLfilters to reduce this interaction is studied for a three-phase voltage source inverter(VSI). Simulation results show that resonant oscillation occurs in a distributed power grid, even if the VSI with an LCL filter is well designed for standalone applications. A small-signal analysis is performed to predict this stability problem and to locate the boundary of the instability using an impedance approach. Based on these analytical results, optimized damping of the LCLfilter can be designed. The oscillation phenomena and optimized damping design are verified by simulations and experimental measurements. 展开更多
关键词 LCL filter three-phase voltage source inverter Non-ideal power grid Optimized design Interacting converters
原文传递
A Sliding Mode Controller Based on Robust Model Reference Adaptive Proportional-integral Control for Stand-alone Three-phase Inverter 被引量:1
18
作者 Hadi Esmaeili Mehdi Asadi 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2021年第3期668-678,共11页
This paper proposes a sliding mode controller based on robust model reference adaptive proportional-integral(RMRA-PI)control for a stand-alone voltage source inverter(SA-VSI).The proposed controller has two control lo... This paper proposes a sliding mode controller based on robust model reference adaptive proportional-integral(RMRA-PI)control for a stand-alone voltage source inverter(SA-VSI).The proposed controller has two control loops where the coefficients of PI controller are regulated by the adaptive sliding law.This method is used to regulate the output voltage of the inverter under different load conditions and uncertainty,and adapts the output to the reference model to reduce the total harmonic distortion(THD).In this paper,the stability of the proposed controller is proven by using Lyapunov's theory and Barbalet’s lemma.The proposed controller performs well in voltage regulation such as low THD under sudden load change and uncertainty.Also,the results of the proposed controller are compared with PI controller to show the effectiveness of the presented control system. 展开更多
关键词 Robust model reference adaptive proportional-integral(RMRA-PI)control stand-alone inverter three-phase inverter voltage control Lyapunov's theory
原文传递
Single-stage Five-level Common Ground Transformerless Inverter with Extendable Structure for Centralized Photovoltaics
19
作者 Vishal Anand Varsha Singh +1 位作者 Jagabar Sathik Dhafer Almakhles 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2023年第1期37-49,共13页
The paper presents a five-level common ground type(5L-CGT),transformer-less inverter topology with double voltage boosting.The proposed inverter uses eight switches and two capacitors,charged at input voltage level.Th... The paper presents a five-level common ground type(5L-CGT),transformer-less inverter topology with double voltage boosting.The proposed inverter uses eight switches and two capacitors,charged at input voltage level.The inverter in its basic form acts as a string inverter for low-power PV applications.However,it can be extended to work as a scalable multi-level inverter with higher power handling capability to act as a centralized inverter.The working of the inverter with the sizing of the components is presented with mathematical analysis.The efficiency of the proposed PV inverter is found using thermal losses associated with switches using PLECS software.A prototype of 1 kW has been designed,and experimentation has been carried out.Various loads with a lagging power factor up to 0.6 have been tested with the inverter to establish the usability of the proposed inverter in a worst-case emulated homeuse scenario.The total harmonic distortion(THD)at the output has been recorded using a power quality analyzer with voltage and current THD values of 4.5%and 2.5%,respectively,which lies within the limits of IEEE 519 standards.The highest power conversion efficiency of the inverter has been recorded to be 96.20%. 展开更多
关键词 Active and reactive power boost inverter common mode voltage(CMV)grid-tied inverters inrush current leakage current photovoltaics
原文传递
Zero Sequence Voltage and Current Control in Four-wire Grids-fed by Grid-forming Inverters
20
作者 Zixian Zhu Wei Chen Vito Giuseppe Monopoli 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2023年第6期2272-2279,共8页
Low voltage three-phase four-wire AC distribution grids may experience high neutral current,mainly caused by asymmetrical distribution of single-phase loads in three phases.High neutral current will not only increase ... Low voltage three-phase four-wire AC distribution grids may experience high neutral current,mainly caused by asymmetrical distribution of single-phase loads in three phases.High neutral current will not only increase line losses but also result in neutral potential variations.For the LV AC distribution grid established by a grid-forming inverter(e.g.,uninterruptible power supply and solid-state-transformer),it also suffers from the same neutral current issues.Therefore,this paper comparatively studies several neutral current control approaches and their impacts on grid voltage balance,which is required by grid code.Then,this paper proposes an optimal neutral current control approach,which can obtain maximum neutral current suppression with less impact on grid voltage balance.The correctness of the theoretical analysis is validated through both simulation and experimental results. 展开更多
关键词 LV AC grid neutral current reduction grid-forming inverter three-phase four-wire system
原文传递
上一页 1 2 下一页 到第
使用帮助 返回顶部