一种改进的任意整数次谐波电压检测方法

基于双d-q变换和三角变换，提出了一种改进的任意整数次谐波电压实时检测方法。该方法通过预设双d-q坐标变换矩阵中的频率，实现了对特定次谐波(包括基波)的检测，通过在检测环节中加入预测补偿角，补偿了数字控制器和逆变器带来的延时。仿真结果验证了该方法的正确性和有效性，表明该方法不仅适用于三相电压对称的理想情况，而且适用于电压不对称、信号非正弦和系统为三相四线制接线的情况。

An Improved Method to Detect Random Integer Order Harmonic Voltage

Based on dual d-q coordinate transformation and trigonometric transform, an improved real-time detection method of random integer-order harmonic voltage is proposed. By means of presupposing the frequency in dual d-q coordinate transformation matrix the detection of specific-order harmonic (including fundamental harmonic) is realized; by way of adding forecasted compensation angle into detecting link, the time-delay brought by digital controller and inverter is compensated. Simulation results validate the correctness and effectiveness of the proposed method and indicate that the proposed method is not only suitable to the optimistic case of symmetrical three-phase voltage, but also for the cases such as unsymmetrical voltage, non-sinusoidal signal and three-phase four-wire system.