基于电压注入的双PWM变流器直流母线电容的在线检测
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摘要
本文提出了一种三相双PWM变流器的直流母线电容的在线检测方法。在空载条件下,将一个频率略低于母线频率的交流电压信号注入到双PWM变流器的直流母线电压中,在直流输出侧产生同频率的功率波动。通过使用数字滤波器提取直流输出端的交流电压和功率分量,利用最小二乘法可以估算出直流母线电容。所提出的方法可以仅通过软件实现而无需额外的硬件,Matlab/Simulink仿真实验结果表明使用此方法得到的电容值估算误差较小。
In this paper, a new method for the online estimation of DC-link Capacitors in three-phase AC-DC-DC PWM converter was proposed. At no-load condition, a controlled AC voltage with a lower frequency than the line frequency is injected into the DC-link voltage, which then causes the AC power ripples at the DC output side. By extracting the AC voltage and power components on the DC output side using digital filters, the capacitance can be calculated by using the recursive least squares(RLS) method. The proposed method can be implemented by software alone without additional hardware. The simulation results of Matlab/Simulink show that the error of capacitance value obtained by this method is very small.
In this paper, a new method for the online estimation of DC-link Capacitors in three-phase AC-DC-DC PWM converter was proposed. At no-load condition, a controlled AC voltage with a lower frequency than the line frequency is injected into the DC-link voltage, which then causes the AC power ripples at the DC output side. By extracting the AC voltage and power components on the DC output side using digital filters, the capacitance can be calculated by using the recursive least squares(RLS) method. The proposed method can be implemented by software alone without additional hardware. The simulation results of Matlab/Simulink show that the error of capacitance value obtained by this method is very small.
引文
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[10]冬雷,韩劲草,肖辅荣,等.一种基于自适应滤波器的新型单相锁相环技术[J].电工技术学报,2016,31(1):155-161.
[11]苏玉刚,陈龙,王智慧,等.基于最小二乘法的感应电能无线传输系统负载辨识方法[J].电工技术学报,2015,30(5):9-14.
[2]肖雄,张勇军,王京,等.基于全响应功率补偿的电压型PWM整流器直接功率控制[J].电工技术学报,2015,30(4):113-120.
[3]曾宪金,李小为,胡立坤,姬丽雯,卢子广.基于自然坐标与功率前馈的三相电压型PWM变流器控制[J].电力系统保护与控制,2015,43(11):13-20.
[4]Thanh Hai Nguyen,Dong-Choon Lee.Deterioration Monitoring of DC-Link Capacitors in AC Machine Drives by Current Injection[J].IEEE Transactions on Power Electronics,2015,30(3):1126-1130.
[5]Junwon Lee,Hyunsik Jo,Hanju Cha.A new Capacitance Estimation method of Supercapacitor Bank using a Bank Impedance and Current Injection[C].IEEE Applied Power Electronics Conference and Exposition,2016:511-515.
[6]Siyuan Ma,Haoran Wang,Junchaojie Tang,et al.Lifetime estimation of DC-link capacitors in a single-phase converter with an integrated active power decoupling module[C].IECON 2016-42nd Annual Conference of the IEEE Industrial Electronics Society,2016:6824-6829.
[8]Siyuan Ma,Haoran Wang,Junchaojie Tang,et al.Lifetime estimation of DC-link capacitors in a single-phase converter with an integrated active power decoupling module[C].IECON 2016-42nd Annual Conference of the IEEE Industrial Electronics Society,2016:6824-6829.
[8]Liangmei Liu,Yong Guan,Minhua Wu,et al.Failure prediction of electrolytic capacitors in SwitchingMode Power Converters[C].Proceedings of the IEEE2012 Prognostics and System Health Management Conference,2012:1126-1130.
[9]林凌,刘明光.基于变频信号法的一种对地电容电流检测系统[J].电力系统保护与控制,2014,42(23):44-49.
[10]冬雷,韩劲草,肖辅荣,等.一种基于自适应滤波器的新型单相锁相环技术[J].电工技术学报,2016,31(1):155-161.
[11]苏玉刚,陈龙,王智慧,等.基于最小二乘法的感应电能无线传输系统负载辨识方法[J].电工技术学报,2015,30(5):9-14.