電網中的主要設備都是感性負載,這就要求電源必須提供無功功率。本文論述了一種
DSP 控制的新型固態無功功率補償器,它基于離散傅立葉變換(DFT)的諧波檢測方法。該系統采用自身控制的直流電壓供電方式,其無功功率的補償是靠DSP 控制逆變器的輸出以一個固定的開關頻率跟蹤一個正弦參考波形而實現的,從而使用戶側的功率因數接近為1,同時極大地抑制了高次諧波,實驗結果證明了理論分析的正確性。
關鍵字: DSP; 離散傅立葉變換; 功率補償
Abstract: A new Solid-State Var Compensator controlled by DSP is analyzed in this paper, which is based on the DFT (Discrete Fourier Transform) detection method. It uses a self-controlled DC bus. Reactive power compensation is achieved by forcing the inverter output current to follow a sinusoidal waveform at a constant switching frequency. Thus enable the power factor of the user side to approach one; it also has suppressed the higher harmonic .The experimental result has proven the theoretical analysis accuracy.
Keywords: DSP; Discrete Fourier Transform; Var Compensator