Due to the components at twice the fundamental frequency of output voltage in the instantaneous output power of a two-stage single-phase inverter(TSI),the second harmonic current(SHC)is generated in the frontend dc-dc...Due to the components at twice the fundamental frequency of output voltage in the instantaneous output power of a two-stage single-phase inverter(TSI),the second harmonic current(SHC)is generated in the frontend dc-dc converter(FDC).To reduce the SHC,optimizing the control strategy of the FDC is an effective and costless approach.Fromthe view of visual impedance,this paper conducts an intensive study on the SHC reduction strategies.Origin of the SHC is illustrated first.Then,the equivalent circuit models of the FDC under different control strategies are proposed to analyse the SHC propagation characteristic.The derived model can offer a better insight into how the inductor SHC is affected by the control parameters.According to the derived models,a synthesis of different control strategies is presented and the relevant parameters are listed for control design to achieve better suppression effect.The benefits and limitations of these control strategies are also discussed.Based on the proposed equivalent circuit models,several optimization methods are proposed to enhance the effect.A 1500 VA TSI prototype is built and simulated on MATLAB/Simulink,verifying the effectiveness of the proposed optimization methods.This paper is aimed to provide a guideline for the control design and control optimization of the TSIs.展开更多
基于基频调制的电流源型换流器(fundamental frequency modulation-based current source converter,FFMCSC)采用先进的逆阻型集成门极换流晶闸管,通过模仿电网换相换流器的控制方式,降低开关损耗,同时具备抵御换相失败的能力。为解决FF...基于基频调制的电流源型换流器(fundamental frequency modulation-based current source converter,FFMCSC)采用先进的逆阻型集成门极换流晶闸管,通过模仿电网换相换流器的控制方式,降低开关损耗,同时具备抵御换相失败的能力。为解决FFM-CSC稳态应力分析过程中非线性、不定初值微分问题,该文提出一种基于循环分段解析的建模方法,利用解算出的时域表达式进行交流基波电流、谐波电流等主要电气应力分析,最后,通过仿真验证该建模方式的准确性以及对FFM-CSC特性分析的便捷性。展开更多
基金This work was supported in part by the Natural Science Foundation of Jiangsu Province under Grant BK20200969(L.Z.,http://std.jiangsu.gov.cn/).
文摘Due to the components at twice the fundamental frequency of output voltage in the instantaneous output power of a two-stage single-phase inverter(TSI),the second harmonic current(SHC)is generated in the frontend dc-dc converter(FDC).To reduce the SHC,optimizing the control strategy of the FDC is an effective and costless approach.Fromthe view of visual impedance,this paper conducts an intensive study on the SHC reduction strategies.Origin of the SHC is illustrated first.Then,the equivalent circuit models of the FDC under different control strategies are proposed to analyse the SHC propagation characteristic.The derived model can offer a better insight into how the inductor SHC is affected by the control parameters.According to the derived models,a synthesis of different control strategies is presented and the relevant parameters are listed for control design to achieve better suppression effect.The benefits and limitations of these control strategies are also discussed.Based on the proposed equivalent circuit models,several optimization methods are proposed to enhance the effect.A 1500 VA TSI prototype is built and simulated on MATLAB/Simulink,verifying the effectiveness of the proposed optimization methods.This paper is aimed to provide a guideline for the control design and control optimization of the TSIs.
文摘基于基频调制的电流源型换流器(fundamental frequency modulation-based current source converter,FFMCSC)采用先进的逆阻型集成门极换流晶闸管,通过模仿电网换相换流器的控制方式,降低开关损耗,同时具备抵御换相失败的能力。为解决FFM-CSC稳态应力分析过程中非线性、不定初值微分问题,该文提出一种基于循环分段解析的建模方法,利用解算出的时域表达式进行交流基波电流、谐波电流等主要电气应力分析,最后,通过仿真验证该建模方式的准确性以及对FFM-CSC特性分析的便捷性。
