Optimized Simultaneous Tuning of VSI Controllers in Autonomous Microgrids Using Differential Evolution Metaheuristic

Bruno Leandro Galvão Costa, S. A. Oliveira da Silva
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Abstract

This paper proposes a differential evolution metaheuristic application for simultaneous tuning of parallel-connected three-phase voltage source inverter (VSI) controllers allocated in an autonomous microgrid. The VSIs structures are composed of power-sharing, voltage, and current controllers that dictate the dynamics performance of the microgrid. The tuning of the controllers is modeled as an optimization problem. This procedure involves minimizing a cost function based on a weighted sum of deviations between instantaneous and nominal active/reactive powers, inner control loop errors, control signals saturation, active power-sharing errors, and the total harmonic distortion of the output voltages. It is considered an eigenvalue stability analysis based on a complete autonomous microgrid small-signal model for defining the search range of the optimization parameters by combining three major sub-modules: droop-controlled three-phase VSIs, network and loads, in conjunction with the frequency response method in terms of phase margin and 0dB crossover frequency. Simulation results are obtained to evidencing the effectiveness of the proposed approach.
基于差分进化元启发式的自主微电网VSI控制器同步优化整定
本文提出了一种微分进化元启发式方法,用于自治微电网中并联三相电压源逆变器控制器的同步整定。vsi结构由功率共享、电压和电流控制器组成,这些控制器决定了微电网的动态性能。将控制器的整定建模为优化问题。这个过程包括最小化成本函数,该函数基于瞬时和标称有功/无功功率、内部控制回路误差、控制信号饱和、有功功率共享误差和输出电压的总谐波失真之间的加权和偏差。将下垂控制三相vsi、网络和负载三个主要子模块结合相位裕度和0dB交叉频率的频率响应方法,定义优化参数的搜索范围,认为是基于完整自治微电网小信号模型的特征值稳定性分析。仿真结果证明了该方法的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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