模糊算法下电力多相电流扰动控制方法研究

Research on Control Method of Power Multiphase Current Disturbance Based on Fuzzy Algorithm

多相电力电子负载电流的控制存在电流解耦困难、波形特征不规律的问题,且与单相电流相比,多相扰动电流的功率值更难获取。为有效增强多相流供电的稳定性,提出基于模糊算法的电力多相电流扰动控制方法。经三相/两相坐标转换,根据瞬时功率理论计算出电流扰动下多相电网的有功、无功功率值。根据三角函数正交定理,通过陷波器去除由于正弦分量产生的谐波,确保电网电压的负序分量幅值为0。基于此,利用模糊规则,计算离散化后PID比例、积分及微分系数,通过模糊判决加权平均法计算得出电流控制输出结果。仿真结果证明,所提算法能够降低谐波对电流影响,滤除谐波扰动,响应速度快,具有可行性和适用性的应用优势。

Compared with single-phase current,it is more difficult to obtain the power value of multiphase disturbance current.In order to effectively enhance the stability of multiphase current power supply,a method of controlling multiphase current disturbance is proposed based on fuzzy algorithm.After the three-phase/two-phase coordinate conversion,based on the instantaneous power theory,the active and reactive power values of multiphase grid under current disturbance were calculated.According to the orthogonal theorem of trigonometric functions,a notch filter was used to remove the harmonic waves generated by sinusoidal components,and thus to ensure that the amplitude of the negative sequence component of grid voltage was zero.On this basis,the PID ratio,integral and differential coefficients after discretization were calculated by fuzzy rules.Finally,the output result of current control was calculated by the weighted average method based on fuzzy decision.Simulation results prove that the proposed algorithm can reduce the influence of harmonics on current,filter harmonic disturbance,and respond quickly,so it has the advantages of feasibility and applicability.