针对单相矩阵式无线电能传输MC-WPT(matrix converter based wireless power transfer)系统网侧电流谐波含量大的问题,提出1种谐波抑制调制策略,可有效降低网侧电流低次谐波含量及总谐波失真度THD(total harmonic distortion)。分析谐...针对单相矩阵式无线电能传输MC-WPT(matrix converter based wireless power transfer)系统网侧电流谐波含量大的问题,提出1种谐波抑制调制策略,可有效降低网侧电流低次谐波含量及总谐波失真度THD(total harmonic distortion)。分析谐振槽电压电流特性,基于参数归一化方法得到2个基波分量的等效电路,进而推导出MC-WPT的数学模型。在此基础上,以消除低次谐波含量为目标,应用计算法得到接收侧H桥的优化调制波,使网侧电流低频成分仅有工频分量,从而降低网侧电流THD。最后搭建实验平台,验证所提谐波抑制调制策略的可行性与有效性。展开更多
This paper proposes a dual vector control scheme based on the sequence component separation strategy(SCSS)for second harmonic suppression in DC power.Firstly,an analytical model is established to depict the positive a...This paper proposes a dual vector control scheme based on the sequence component separation strategy(SCSS)for second harmonic suppression in DC power.Firstly,an analytical model is established to depict the positive and negative sequences of the controllable current source converter(CSC)under unbalanced grid conditions.Moreover,the generation mechanism of the DC power second harmonic component in the hybrid VSC-CSC HVDC system is demonstrated.This paper summarizes the impact of the modulation index(MI)and power factor(PF)on the operating characteristics of the modular multilevel converter(MMC)during the variation of the DC voltage.Based on the above analysis,the proposed control scheme extracts the sequence components of the CSC capacitor voltage and directly computes the sequence voltage reference value using instantaneous power.This approach effectively suppresses the second-harmonic component in DC power and significantly reduces the range of capacitor-voltage fluctuations in MMC submodules.Finally,an electromagnetic transient model of the hybrid HVDC system is constructed to validate the accuracy of the theoretical analysis and the effectiveness of the proposed control scheme.展开更多
文摘针对单相矩阵式无线电能传输MC-WPT(matrix converter based wireless power transfer)系统网侧电流谐波含量大的问题,提出1种谐波抑制调制策略,可有效降低网侧电流低次谐波含量及总谐波失真度THD(total harmonic distortion)。分析谐振槽电压电流特性,基于参数归一化方法得到2个基波分量的等效电路,进而推导出MC-WPT的数学模型。在此基础上,以消除低次谐波含量为目标,应用计算法得到接收侧H桥的优化调制波,使网侧电流低频成分仅有工频分量,从而降低网侧电流THD。最后搭建实验平台,验证所提谐波抑制调制策略的可行性与有效性。
基金supported by Smart GridNational Science and Technology Major Project(2025ZD0803700).
文摘This paper proposes a dual vector control scheme based on the sequence component separation strategy(SCSS)for second harmonic suppression in DC power.Firstly,an analytical model is established to depict the positive and negative sequences of the controllable current source converter(CSC)under unbalanced grid conditions.Moreover,the generation mechanism of the DC power second harmonic component in the hybrid VSC-CSC HVDC system is demonstrated.This paper summarizes the impact of the modulation index(MI)and power factor(PF)on the operating characteristics of the modular multilevel converter(MMC)during the variation of the DC voltage.Based on the above analysis,the proposed control scheme extracts the sequence components of the CSC capacitor voltage and directly computes the sequence voltage reference value using instantaneous power.This approach effectively suppresses the second-harmonic component in DC power and significantly reduces the range of capacitor-voltage fluctuations in MMC submodules.Finally,an electromagnetic transient model of the hybrid HVDC system is constructed to validate the accuracy of the theoretical analysis and the effectiveness of the proposed control scheme.
