【摘要】 在传统的基于DFT的谐波电流检测算法的基础上,提出了一种基于时域的电流检测算法,该算法具有DFT算法的灵活性,但克服了DFT需要一个工频周期的延时的缺点,同时又具有物理意义明确的特点,采用该算法可以方便、快速地检测出基波、基波无功、基波有功、基波正序、基波负序、基波正序有功以及各次谐波,该算法实现简单,易于编程,且检测效果很好,为有源电力滤波器满足不同的补偿目的提供了可靠保证。最后通过实验验证了该算法的正确性。更多还原

【Abstract】 A novel current detection algorithm based on time domain for a three-phase shunt active power filter to eliminate harmonics and/or to correct power-factor and/or to balance the nonlinear unbalanced loads is presented and analyzed in this paper. This paper firstly presents the evaluation of the performance of three state-of-the-art current detection algorithms for active power filter. According to the complex power quality problems and various compensation purposes, such as harmonics elimination, special order harmonics elimination, reactive power compensation and fundamental negative-sequence current compensation, a novel current detection algorithm is presented. Comparing with other algorithms, this algorithm has the advantages of short time delay and clear physics concept. Different compensating current references can be obtained accurately and easily by adopting the presented algorithm. It ensures that the APF can achieve different compensation purposes well. Moreover, this algorithm is easy to be implemented in DSP. Experimental results are presented to validate the proposed algorithm.更多还原