Inaccurate reactive power sharing and voltage distortion at the point of common coupling (PCC) always exist in a parallel inverter system due to feeder impedance mismatches and nonlinear load disturbances. An enhanced inverter control scheme through an output impedance adjustment is proposed to address these issues. Inverter output impedance is regulated considering fundamental and harmonic frequencies, and accurate power sharing and improved PCC voltage quality are realized at the steady state. In addition, the compensation scheme is easily applied in multiple parallel inverters without any prior knowledge of the feeder impedance. Experimental results with three parallel inverters validate the feasibility of the proposed control scheme.

中文翻译：

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单相电压源逆变器并联运行的精确功率分配和谐波抑制方案

由于馈线阻抗不匹配和非线性负载扰动，并联逆变器系统中始终存在共耦合点 (PCC) 处的不准确无功功率分配和电压失真。提出了通过输出阻抗调整的增强型逆变器控制方案来解决这些问题。考虑基频和谐波频率调节逆变器输出阻抗，并在稳态下实现准确的功率分配和改善的 PCC 电压质量。此外，补偿方案很容易应用于多个并联逆变器，而无需任何馈线阻抗的先验知识。三个并联逆变器的实验结果验证了所提出的控制方案的可行性。