基于单神经元PI的双馈风力发电系统网侧变流器控制策略研究

Research on Control Strategy of Grid-side Converter for Doubly Fed Wind Power Generation System Based on Single Neuron PI Controller

针对双馈风力发电系统网侧变流器的非线性特性,提出了一种基于单神经元PI算法的网侧变流器控制策略,采用电网电压定向的矢量控制结合单神经元PI控制,实现了网侧变流器有功功率和无功功率的解耦控制,其中单神经元PI控制器的比例、积分系数根据直流侧的电压误差进行自适应调整。在PSCAD/EMTDC环境下,建立了双馈风力发电系统仿真模型。仿真结果表明,该控制策略可实现期望直流母线电压的快速、稳定跟踪,同时能够快速实现单位功率因数控制,具有较强的抗扰动能力与鲁棒性。

A single neuron PI control algorithm of grid-side converter for doubly fed wind power generation system is proposed against its nonlinearity.Grid-voltage oriented vector controller combined with the single neuron PI algorithm is used to realize decoupling control of the reactive power and active power of grid-side converter,in which the proportional coefficient and integral coefficient of the singleneuron PI controller are adjusted adaptively according to the voltage error at DC side of converter.A simulation model of the doubly fed wind power generation system is established with the PSCAD / EMTDC.The simulation results verify that this control strategy has a strong anti-disturbance ability and robustness,which not only can achieve fast and stable tracking of the DC bus voltage,but also achieve quick unity power factor control.