基于反步控制的特定次谐波电流补偿研究

Research on specific subharmonic current compensation based on backstepping control

电网中广泛采用非线性负载,由此造成的谐波污染问题日益严重,有源电力滤波器是解决谐波污染的有效手段之一。基于谐波提取算法,兼顾稳态响应以及参数选取,提出将反步法引入谐波补偿的设计,对谐波电流跟踪控制器进行重新构建。依据反步法理论进行控制器的设计,能够达到较好的稳态补偿效果,其参数的选取较易。在MATLAB/Simulink中进行PI控制与反步控制的仿真对比,结果验证了所提控制策略对特定次谐波补偿的有效性,直流侧电容电压的反步控制较PI控制超调小、响应速度快,仿真结果证明了反步控制具有更高的补偿精度以及较快的动态响应。

The widespread use of nonlinear loads in power grids has led to increasingly severe harmonic pollu-tion problems.Active power filters are one effective means to address harmonic pollution.Based on harmonic extraction algorithms,considering both steady-state response and parameter selection,this study proposes the integration of backstepping control into harmonic compensation design,aiming to reconstruct the harmonic current tracking controller.By utilizing the theoretical framework of backstepping,the controller design achieves favorable steady-state compensation effects with relatively straightforward parameter selection.Simu-lation comparisons between PI control and backstepping control in MATLAB/Simulink validate the effective-ness of the proposed control strategy in compensating specific-order harmonics.Backstepping control of DC side capacitor voltage exhibits smaller overshoot and faster response compared to PI control.The simulation re-sults collectively demonstrate that backstepping control offers higher compensation precision and faster dynamic response.