校正函数修正的风电并网自抗扰控制系统

WIND POWER GRID-CONNECTED ACTIVE DISTURBANCE REJECTION CONTROL SYSTEM WITH CORRECTION FUNCTION

针对风电系统运行过程中受未知扰动影响而出现的直流母线电压波动问题,提出一种校正函数修正的自抗扰控制策略(LADRC-CF)。该方法在线性扩张状态观测器(LESO)的扰动观测通道中引入串联校正的思想,通过校正函数修正LESO对总和扰动的观测偏差,以实现更好的扰动补偿,进而达成对直流母线电压的良好控制。此外,还从理论上分析LADRC-CF的稳定性和扰动跟踪能力,在证明稳定性的同时给出部分参数的整定方法。最后,在半实物仿真平台上对LADRC-CF策略的控制性能进行测试,验证所提策略的有效性和优越性。

To solve the problem of DC bus voltage fluctuation caused by unknown disturbance in wind power system,an active disturbance rejection control with correction function(LADRC-CF)is proposed in this paper.This technique introduces the idea of series correction in the disturbance observation channel of the linear extended state observer(LESO),and uses the correction function to correct the observation deviation of the LESO for the sum disturbance to achieve better disturbance compensation,and then reach a good control of the DC bus voltage.In addition,the stability and perturbation tracking capability of LADRC-CF are analyzed theoretically.The stability is proved while the rectification method of some parameters is given.Finally,the control performance of the LADRC-CF strategy is tested on a hardware-in-the-loop simulation platform to verify the effectiveness and superiority of the strategy.