Current sharing method for parallel inverters based on impedance matching mode
Current sharing method for parallel inverters based on impedance matching mode
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基于阻抗匹配模式的并联逆变器均流方法
DOI：
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发表时间：
2012
影响因子：
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通讯作者：
Yan, Shi-Jie
中科院分区：
文献类型：
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作者：
Wang, Xu;Liu, Jian-Chang;Song, Chong-Hui;Yan, Shi-Jie
为解决逆变器并联系统的动态均流问题，提出了一种阻抗匹配模式的逆变器并联控制方案，根据电路等效理论，将开环控制的逆变器等效为恒压源和串联形式的虚拟阻抗，给出了阻抗参数辨识方法，将逆变器的等效电路视为被控对象和控制对象，推导了改变逆变器输出虚拟阻抗的方法，给出了并联逆变器之间的虚拟阻抗匹配条件，该方案除了给出逆变器共享的正弦电压信号外，本文对两台容量分别为1kVA和1kVA的逆变器并联运行进行了仿真和实验研究，并对两台逆变器并联运行的情况进行了仿真和实验研究，结果表明，该控制方法简单，易于实现仿真和实验结果表明，在负载阶跃变化下，两台逆变器输出电流峰值相差小于0.1 A，且无过渡过程。
To solve the dynamic current sharing problem of inverter parallel system,a parallel inverter control scheme with impedance matching mode was proposed.According to the equivalent theory of circuit,the inverter of open-loop control was equivalent to the constant voltage source and the virtual impedance in series form,the impedance parameters identification method was given.The equivalent circuit of the inverter was treated as the controlled plant and the control method was derived to change the output virtual impedance of the inverter.Virtual impedance matching condition between the parallel inverters was given.Besides the given sinusoidal voltage signal shared by the invert in the proposal,the current sharing independently was realized.The control methods are simple and easy to be applied.Simulation and experimental studies have been carried out on two parallel connected inverters which capacities are 1 kVA and no-load output voltages are 220 V.Simulation and experimental results show that the difference of the two inverter output current peak is less than 0.1 A and there is no transition process under load step change.