基于DFT諧波檢測(cè)的無功補(bǔ)償系統(tǒng)設(shè)計(jì)

電網(wǎng)中的主要設(shè)備都是感性負(fù)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(tài)無功功率補(bǔ)償器,它基于離散傅立葉變換(DFT)的諧波檢測(cè)方法。該系統(tǒng)采用自身控制的直流電壓供電方式,其無功功率的補(bǔ)償是靠DSP 控制逆變器的輸出以一個(gè)固定的開關(guān)頻率跟蹤一個(gè)正弦參考波形而實(shí)現(xiàn)的,從而使用戶側(cè)的功率因數(shù)接近為1,同時(shí)極大地抑制了高次諧波,實(shí)驗(yàn)結(jié)果證明了理論分析的正確性。
關(guān)鍵字: DSP; 離散傅立葉變換; 功率補(bǔ)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