為了提高小型風(fēng)力發(fā)電系統(tǒng)輸出電能質(zhì)量，設(shè)計了高效、可靠、低成本的正弦波逆變器。主電路由推挽升壓變換器和單相逆變橋組成，采用高頻變壓器實現(xiàn)電壓比調(diào)整和電氣隔離，降低了噪聲，提高了效率、減小了輸出電壓紋波。逆變器功率開關(guān)管采用了RCVD緩沖電路，確保逆變橋安全工作。控制部分采用集成脈寬調(diào)制芯片SG3524和正弦函數(shù)發(fā)生芯片ICL8038實現(xiàn)正弦波脈寬調(diào)制(SPWM)，簡單可靠、易于調(diào)試。實驗樣機(jī)體積減小到傳統(tǒng)逆變器的1/4，效率達(dá)到86%。實驗結(jié)果表明輸出電壓波形失真度小于5%，在復(fù)雜的工況下實現(xiàn)了220 V/50 Hz的市電輸出。

　　Abstract:

　　To improve electric energy quality of small scale wind power generating system output a high efficiency， credible and low cost sine-wave inverter is presented in this paper， High frequency inverter technology is selected. It contains high frequency transformer， which can fulfill voltage ratio regulation and electricity isolation， push-pull converter and single-phase bridge circuit as the main circuit， degrade noise， raise efficiency， reduce voltage ripple. Power switching tube adopts a RCVD cushion circuit to ensure safety working. Sine pulse width modulation control form is selected by using integrated circuit SG3524 and ICL8038， and simple， credibility， easy debug. The experimental model machine reduces the volume to 1/4 of the traditional inverter， system efficiency reach 86%. The experimental result indicates the distortion factor of the output voltage waveform less than 5% and output is 220V/50Hz commercial power in complicated operating mode.