基于滞环SVPWM的有源电力滤波器故障容错方法

A Fault-Tolerance Method for Hysteresis SVPWM Based Active Power Filter

为提高有源电力滤波器(active power filter,APF)的故障容错能力,提出了一种基于滞环空间矢量脉宽调制(space vector pulse width modulation,SVPWM)策略的APF故障容错方法。逆变器发生故障时,利用故障状态下有效电压矢量的合成矢量等效替代原控制算法选定的电压矢量,保证APF能在故障状态下继续工作。该方法是在原控制算法的基础上进行容错控制,不需要备用容错算法,降低了计算量。此外,该方法不需要精确估计参考电压值和阻抗参数值,克服了参数估计误差所带来的影响,而且可以实现参数的解耦控制,能够显著提高APF的工作可靠性。仿真和实验结果验证了该方法的有效性。

To improve the fault tolerance ability of active power filter （APF）, a hysteresis space vector pulse width modulation （SVPWM） strategy based fault tolerance method is proposed, that is, when inverter failure happens, the resultant vector of available voltage vector under fault condition is used to equivalently substitute the voltage vector selected by original control algorithm to ensure APF enable to keep working under fault condition. The essence of the proposed method is to perform tolerant control on the basis of original control algorithm, so the spare tolerant algorithm is not needed, thus the calculated amount is reduced. Besides, the values of voltage reference and impedance parameter are not to be estimated accurately, therefore the affect due to parameter estimation error can be overcome and the decoupling control of parameters can be implemented to enhance operational reliability of APF obviously. The effectiveness of the proposed method is validated by results of simulation and experiments.