TY - JOUR T1 - Improvement of steady and transient response of instantaneous power theory compensation method using recursive least squares and wavelet transform under non-ideal voltage condition TT - بهبود پاسخ گذرا و دائم روش جبرانسازی تئوری توان لحظه‌ای با استفاده از حداقل مربعات بازگشتی و تبدیل موجک در شرایط ولتاژ غیر ایده‌آل JF - jnsee JO - jnsee VL - 3 IS - 1 UR - http://journals.sut.ac.ir/jnsee/article-1-96-en.html Y1 - 2015 SP - 5 EP - 21 KW - steady and transient response KW - recursive least squares KW - active filter KW - compensation KW - delta-sigma modulation N2 - Steady-state and transient response of the active power filter based on instantaneous power theory compensation method is dependent on the accurately and quickly extract the DC component of load active power. In this paper, for improving the response of this method, the numerical filter based on recursive least squares with variable forgetting factor in order to separation of DC component of load active power is proposed. Unlike conventional low-pass filters, the feature of designed numerical filter is independent of load harmonic components, quick and precision of the answer. Also, using wavelet transform the performance of active power filter under the non-ideal voltage condition is improved. Finally, the second order delta-sigma modulation is used to generate the switching pulses. Simulation results on MATLAB / SIMULINK software shows that the proposed method is properly. M3 ER -