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准确、快速地检测系统电流中的谐波成分。是保证有源电力滤波器(APF)具备良好工作性能的关键。受硬件和软件的限制,现有的各种谐波检测方法都存在延时问题,检测结果实际是之前的谐波电流,因此会产生较大误差。对谐波电流进行准确的跟踪和预测,然后根据预测值进行补偿是解决这一问题的有效办法。由此提出了一种改进型预测谐波电流的检测方法,能够在t时刻准确预测出t+2时刻的谐波电流值。经过理论分析和仿真研究表明,该方法检测误差小,并能克服低通滤波器造成的延时,使APF的控制时滞大大减少。
Accurate and fast detection of system current harmonics. It is the key that assures active power filter (APF) with good working performance. Due to the limitations of hardware and software, there are delay problems in all the existing harmonic detection methods. The detection result is actually the harmonic current before, which leads to a large error. Accurately tracking and predicting the harmonic current and then compensating the predicted value is an effective way to solve this problem. Therefore, an improved detection method for predicting harmonic current is proposed, which can accurately predict the harmonic current at t + 2 at time t. The theoretical analysis and simulation results show that this method has small detection error and can overcome the delay caused by the low-pass filter, which greatly reduces the control delay of APF.