基于小信号稳定性的直流微电网多控制器参数全局优化方法  

Global Optimization Method for Multi-controller Parameters of DC Microgrids Based on Small-Signal Stability

作　　者：朱晓荣[1] 冯天娇 ZHU Xiaorong;FENG Tianjiao(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Resources(North China Electric Power University),Baoding 071003,Hebei Province,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),河北省保定市071003

出　　处：《电力建设》2023年第6期112-125,共14页Electric Power Construction

基　　金：国家自然科学基金项目(52077079)。

摘　　要：直流微电网中存在多个控制器,而不同控制器参数的组合对系统的整体稳定性影响也存在差异。为提升系统稳定性,提出了一种基于小信号稳定性的直流微电网多控制器参数全局优化方法。首先,推导了系统的小信号模型,对系统进行特征值分析和参与因子分析,确定了PI参数、下垂系数、虚拟惯性系数等关键控制参数的稳定域;其次,建立了包含系统主导极点实部、阻尼比和储能最大输出功率的目标函数,并采用正交实验法获得样本数据,利用综合赋权法对多目标进行赋权;然后,采用结合灰狼优化的改进粒子群算法对系统的关键参数进行优化,结果表明参数优化后的系统特征值更加远离虚轴,阻尼比增大,储能最大输出功率增加,系统稳定性得到了提升;最后,通过仿真验证了所提方法的有效性和优越性。DC microgrid systems have multiple controllers,and the combination of different controller parameters has different effects on the stability of the entire system.To improve system stability,a multi-controller parameter global optimization method based on small-signal stability is proposed.First,the small-signal model of the system is deduced,and eigenvalue and participation factor analyses of the system are performed to determine the stability domain of key control parameters such as PI parameters,droop coefficients,and virtual inertia coefficients.The objective function,including the maximum real part of the eigenvalue,damping ratio,and maximum output power of the energy storage,is established.The sample data are obtained by using an orthogonal experiment,and the multi-objective is weighted by using a comprehensive weighting method.The key parameters of the system are then optimized using improved particle swarm optimization based on the grey wolf algorithm,thereby yielding the optimization results.The results show that the eigenvalues of the system after parameter optimization are farther away from the imaginary axis,the damping ratio increases,and the maximum output power of the energy storage increases,which improves system stability.Finally,the effectiveness and superiority of the proposed method are verified by building a model on the MATLAB Simulink simulation platform.

关 键 词：直流微电网 控制器参数优化 综合赋权法 改进粒子群算法 稳定性分析 

分 类 号：TM73[电气工程—电力系统及自动化]