基于谐波注入法的互联变流器功率偏差控制  

Power Deviation Control of Interlinking Converter Based on Harmonic Injection Method

作　　者：王树彪 张昊亮 吴昊[1] 邢益斌 WANG Shu-biao;ZHANG Hao-liang;WU Hao;XING Yi-bin(State Grid Nanjing Power Supply Company,Nanjing 210019,China)

机构地区：[1]国网南京供电公司,江苏南京210019

出　　处：《电力电子技术》2023年第2期26-29,共4页Power Electronics

摘　　要：混合微电网(HM)中线路阻抗的存在会导致连接交、直流子网两侧的互联变流器(ILC)传输功率偏离实际值,影响HM的稳定运行。为此,这里提出了一种基于谐波注入法的ILC控制策略。该策略首先通过向ILC中注入一幅值较小的电压谐波信号,该注入的电压谐波信号频率与母线电压保持一定函数关系。然后通过ILC侧检测注入的谐波频率,并根据ILC传输的有功功率、电压及线路阻抗的关系获得线路阻抗。其次在获得线路阻抗的基础上进行线路压降补偿,从而降低了ILC传输功率的偏差。最后基于StarSim搭建实验平台验证了所提方法的可行性。The existence of line impedance in the hybrid microgrid(HM) can cause the transmission power of the interlinking converter(ILC) connecting the two sides of the alternating current and direct current subgrids to deviate from the actual value,which affects the stable operation of the HM.To this end,an ILC control strategy based on the harmonic injection method is proposed.The strategy starts by injecting a small voltage harmonic signal into the ILC,and the frequency of the injected voltage harmonic signal keeps a certain function with the bus voltage.Then the injected harmonic frequency is detected by the ILC side,and the line impedance is obtained according to the relationship among the active power,voltage and line impedance transmitted by the ILC.Next,the line voltage drop compensation is performed on the basis of the obtained line impedance,thus reducing the deviation of the power transmitted by the ILC.Finally,an experimental platform based on StarSim is built to verify the feasibility of the proposed method.

关 键 词：互联变流器 混合微电网 电压谐波信号 线路压降补偿 

分 类 号：TM46[电气工程—电器]