为解决小功率电流源输出波形质量不佳的问题,采用 PI+重复控制算法,应用在单相程控电流源逆变器的输出波形控制上。首先搭建小功率电流源逆变器模型,分析单电流环 PI 控制和 PI+重复控制下系统的传递函数,在此基础上设计 PI 控制器和重...为解决小功率电流源输出波形质量不佳的问题,采用 PI+重复控制算法,应用在单相程控电流源逆变器的输出波形控制上。首先搭建小功率电流源逆变器模型,分析单电流环 PI 控制和 PI+重复控制下系统的传递函数,在此基础上设计 PI 控制器和重复控制器,并做参数设计。仿真对比表明,该复合控制策略比 PI 控制输出波形质量更好、控制精度更高。最后搭建一台功率为25W,输出范围为 0~5A 标准程控电流源实物样机并进行相应实验,验证了理论分析的可行性。展开更多
In this paper,a robust design method for current control is proposed to improve the performance of a three phase voltage source converter(VSC)with an inductorcapacitor-inductor(LCL)filter.The presence of the LCL filte...In this paper,a robust design method for current control is proposed to improve the performance of a three phase voltage source converter(VSC)with an inductorcapacitor-inductor(LCL)filter.The presence of the LCL filter complicates the dynamics of the control system and limits the achievable control bandwidth(and the overall performance),particularly when the uncertainty of the parameters is considered.To solve this problem,the advanced H?control theory is employed to design a robust current controller in stationary coordinates.Both control of the fundamental frequency current and suppression of the potential LC resonance are considered.The design procedure and the selection of the weight functions are presented in detail.A conventional proportional-resonant PR controller is also designed for comparison.Analysis showed that the proposed H∞ current controller achieved a good frequency response with explicit robustness.The conclusion was verified on a 5 kW VSC that had a LCL filter.展开更多
High Voltage Direct Current(HVDC) grids are the most effective solutions for collection, integration and transmission of large scale remote renewable resources to load centers. A HVDC grid test model can provide a com...High Voltage Direct Current(HVDC) grids are the most effective solutions for collection, integration and transmission of large scale remote renewable resources to load centers. A HVDC grid test model can provide a common reference and study platform for researchers to compare the performance and characteristics of a DC grid with different DC control functions and protection strategies. It can also provide reference cases for testing of simulators and digital programs. This paper proposes a comprehensive HVDC grid test model and the associated four sub test models for system studies to meet the research purposes and requirements for different DC grid application scenarios. The design concept, topologies, configurations and functions of the test models are described in detail and their basic system data for load flow studies are provided. Finally load flow simulation studies with PSS/E(Power System Simulator/Engineering) program for each of the models are undertaken and the corresponding results are presented and analyzed in the paper.展开更多
文摘为解决小功率电流源输出波形质量不佳的问题,采用 PI+重复控制算法,应用在单相程控电流源逆变器的输出波形控制上。首先搭建小功率电流源逆变器模型,分析单电流环 PI 控制和 PI+重复控制下系统的传递函数,在此基础上设计 PI 控制器和重复控制器,并做参数设计。仿真对比表明,该复合控制策略比 PI 控制输出波形质量更好、控制精度更高。最后搭建一台功率为25W,输出范围为 0~5A 标准程控电流源实物样机并进行相应实验,验证了理论分析的可行性。
基金This research was supported by the CAS Fraunhofer Joint Doctoral Promotion Program(DPP)and the National High Technology Research and Development Program of China(863 program)(No.2011AA050204).
文摘In this paper,a robust design method for current control is proposed to improve the performance of a three phase voltage source converter(VSC)with an inductorcapacitor-inductor(LCL)filter.The presence of the LCL filter complicates the dynamics of the control system and limits the achievable control bandwidth(and the overall performance),particularly when the uncertainty of the parameters is considered.To solve this problem,the advanced H?control theory is employed to design a robust current controller in stationary coordinates.Both control of the fundamental frequency current and suppression of the potential LC resonance are considered.The design procedure and the selection of the weight functions are presented in detail.A conventional proportional-resonant PR controller is also designed for comparison.Analysis showed that the proposed H∞ current controller achieved a good frequency response with explicit robustness.The conclusion was verified on a 5 kW VSC that had a LCL filter.
基金supported by the State Grid Corporation of China,through the 1000-Plan project(No.[2014]264)
文摘High Voltage Direct Current(HVDC) grids are the most effective solutions for collection, integration and transmission of large scale remote renewable resources to load centers. A HVDC grid test model can provide a common reference and study platform for researchers to compare the performance and characteristics of a DC grid with different DC control functions and protection strategies. It can also provide reference cases for testing of simulators and digital programs. This paper proposes a comprehensive HVDC grid test model and the associated four sub test models for system studies to meet the research purposes and requirements for different DC grid application scenarios. The design concept, topologies, configurations and functions of the test models are described in detail and their basic system data for load flow studies are provided. Finally load flow simulation studies with PSS/E(Power System Simulator/Engineering) program for each of the models are undertaken and the corresponding results are presented and analyzed in the paper.
