单相并网逆变器母线电容纹波分析与抑制研究
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摘要
由Boost电路和DC/AC电路组成的两级并网逆变器会在直流母线电容上产生高低频纹波,过大的纹波电压会导致输出电压畸变,而过大的纹波电流会导致电容发热,缩短使用寿命。文章针对某3 kW单相光伏并网逆变器,提出了一种纹波电压和纹波电流综合分析整治方法,依此来指导母线电容参数的选取和抑制纹波幅值。样机试验结果说明了分析方法的正确性。
Two-step single-phase grid-connected inverter consists of boost circuit and DC/AC circuit, which will generate high and low frequency ripple in DC-link capacitance easily, and oversize ripple voltage will make output voltage distortion, oversize ripple current will decrease lifespan of capacitance because of heat production. Aiming at a 3kW single-phase grid-connected inverter, a new theory is proposed to analyze ripple voltage and current and to determine capacitance parameters in this paper. In addition, the theory is effective in ripple suppression. Experimental results are compared in terms of ripple amplitude.
Two-step single-phase grid-connected inverter consists of boost circuit and DC/AC circuit, which will generate high and low frequency ripple in DC-link capacitance easily, and oversize ripple voltage will make output voltage distortion, oversize ripple current will decrease lifespan of capacitance because of heat production. Aiming at a 3kW single-phase grid-connected inverter, a new theory is proposed to analyze ripple voltage and current and to determine capacitance parameters in this paper. In addition, the theory is effective in ripple suppression. Experimental results are compared in terms of ripple amplitude.
引文
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[7]黄建刚,卢旭倩,王建华,等.两级式逆变器输入低频纹波电流抑制[J].电力电子技术,2011,45(3):91-92.[7]Huang Jian gang,Lu Xuqian,Wang Jianhua,et al.Low fequency input current ripple limit in two-stage inverter[J].Power Electronics,2011,45(3):91-92.
[8]王正,于新平.逆变电源直流母线纹波电流分析与抑制研究[J].电力电子技术,2013,47(3):93-95.[8]Wang Zheng,Yu Xinping.Analysis and inhibition studies of the DC-bus ripple of inverter power supply[J].Power Electronics,2013,47(3):93-95.
[9]Texas Instruments.Understanding boost power stages in switchmode power supplies[R].Texas:Texas Instruments Incorporated,1994.
[2]蒋利田.DC-DC变换器的纹波电压测试及数据处理[D].广州:华南理工大学,2010.[2]Jiang Litian.The measurement of ripple voltage for DC/DC converter and data process[D].Guangzhou:South China University of Technology,2010.
[3]丁继华,陈卫东.铝电解电容器耐纹波电流探讨[J].电子元件与材料,2001,20(5):6-7.[3]Ding Jihua,Chen Weidong.Enhancement of ripple current capacity of electrolytic capacitors[J].Electronic Components and Materials,2001,20(5):6-7.
[4]Dahono P A,Sato Y,Kataoka T.Analysis and minimization of ripple components of input current and voltage of PWM inverters[J].IEEE Trans.on Industy Applications,1996,32(4):945-950.
[5]刘亮,邓名高.有源电力滤波器直流母线电容损坏分析[J].电工技术,2011,32(1):69-70.[5]Liu Liang,Deng Minggao.Damage analysis of DC bus capacitor of active power filter[J].Electric Engineering,2011,32(1):69-70.
[6]J W Kolar,S D Round.Analytical calculation of the RMS current stress on the DC-link capacitor of voltage-PWM converter system[J].IEEE Process Electric Power Applications,2006,153(4):535-543.
[7]黄建刚,卢旭倩,王建华,等.两级式逆变器输入低频纹波电流抑制[J].电力电子技术,2011,45(3):91-92.[7]Huang Jian gang,Lu Xuqian,Wang Jianhua,et al.Low fequency input current ripple limit in two-stage inverter[J].Power Electronics,2011,45(3):91-92.
[8]王正,于新平.逆变电源直流母线纹波电流分析与抑制研究[J].电力电子技术,2013,47(3):93-95.[8]Wang Zheng,Yu Xinping.Analysis and inhibition studies of the DC-bus ripple of inverter power supply[J].Power Electronics,2013,47(3):93-95.
[9]Texas Instruments.Understanding boost power stages in switchmode power supplies[R].Texas:Texas Instruments Incorporated,1994.