Proper control of distributed generator (DG) interfacing inverter can enhance the power quality and stability of microgrid (MG). For this purpose, a fractional proportional-resonant controller (FPR) is introduced in this article. Using fractional-order computation reduces the voltage and current harmonics of the controller which enables better performance of the system under non-linear load conditions. The proposed controller is used for both voltage control and current control inner loops. The main contribution of this article is controlling the voltage source converters using the voltage control method with proposed FPR controller. The proposed FPR controller improves the power quality parameters of DG in MG more than other conventional controllers. Also, tuning the coefficients of the proposed controller is optimized by the particle swarm optimization (PSO) algorithm which leads to presenting the new PSO-FPR controller. The new controller formulation is implied in a simulated 650V, 2.2kW islanding microgrid with a non-linear load in Matlab-Simulink software. Finally, the results show that the amount of total harmonic distortion (THD) of the inverter output voltage reduces.

正确控制分布式发电机（DG）接口逆变器可以提高微网（MG）的电能质量和稳定性。为此，本文引入了分数比例谐振控制器（FPR）。使用分数阶计算可降低控制器的电压和电流谐波，从而在非线性负载条件下实现更好的系统性能。所提出的控制器可用于电压控制和电流控制内部环路。本文的主要贡献是使用电压控制方法和提出的FPR控制器来控制电压源转换器。提出的FPR控制器比其他传统控制器更能改善MG中DG的电能质量参数。还，通过粒子群优化（PSO）算法对建议控制器的系数进行优化调整，从而提出了新的PSO-FPR控制器。在Matlab-Simulink软件中，具有非线性负载的模拟650V，2.2kW孤岛微电网中隐含了新的控制器公式。最后，结果表明，逆变器输出电压的总谐波失真（THD）量减少了。