Voltage unbalance and harmonics are the major power quality issues in inverter‐based low voltage microgrids (MGs). In the presence of nonlinear load, the interconnecting inverters in the MG may not be able to compute the amount of reactive power and harmonics to be compensated independently without violating their respective ratings. This may result in disproportionate sharing of power by the individual inverters, and consequently resulting in the overloading of some of the inverters. Therefore, in the proposed work, a repetitive controller (RC) in addition to an existing controller has been developed and added in the outer most. This RC can control the individual inverters to compensate voltage unbalance and nonlinear loading through proportionate effort sharing by individual inverters in the MG. This technique has been successfully implemented on three‐phase voltage source inverter which is controlled to maintain perfect three‐phase balanced set of voltages under unbalance nonlinear loading conditions. The proposed strategy has shown an effective compensation even under highest degree of unbalance and nonlinear loading in MG. The proposed controller is designed and simulated with MATLAB/Simpower system. Field programmable gate array‐based hardware prototype has been developed to validate the control approach experimentally.

中文翻译：

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使用附加重复控制器在交流微电网中进行电压不平衡和谐波补偿

电压不平衡和谐波是基于逆变器的低压微电网（MG）的主要电能质量问题。在存在非线性负载的情况下，MG中的互连逆变器可能无法计算无功功率和要独立补偿的谐波，而不会违反它们各自的额定值。这可能会导致各个逆变器不均衡地共享功率，从而导致某些逆变器过载。因此，在提出的工作中，除了现有的控制器以外，还开发了重复控制器（RC），并将其添加到最外面。该RC可以控制各个逆变器，以通过MG中各个逆变器按比例分配工作量来补偿电压不平衡和非线性负载。该技术已在三相电压源逆变器上成功实施，该逆变器被控制为在不平衡非线性负载条件下维持完美的三相平衡电压组。所提出的策略即使在MG中最大程度的不平衡和非线性负载下也显示出有效的补偿。所提出的控制器是使用MATLAB / Simpower系统进行设计和仿真的。已经开发了基于现场可编程门阵列的硬件原型，以通过实验验证控制方法。所提出的控制器是使用MATLAB / Simpower系统进行设计和仿真的。已经开发了基于现场可编程门阵列的硬件原型，以通过实验验证控制方法。所提出的控制器是使用MATLAB / Simpower系统进行设计和仿真的。已经开发了基于现场可编程门阵列的硬件原型，以通过实验验证控制方法。