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首页> 外文期刊>Journal of power electronics >Estimation of ESR in the DC-Link Capacitors of AC Motor Drive Systems with a Front-End Diode Rectifier
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Estimation of ESR in the DC-Link Capacitors of AC Motor Drive Systems with a Front-End Diode Rectifier

机译：带有前端二极管整流器的交流电动机驱动系统的直流环节电容器中的ESR估算

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摘要

In this paper, a new method for the online estimation of equivalent series resistances (ESR) of the DC-link capacitors in induction machine (IM) drive systems with a front-end diode rectifier is proposed, where the ESR estimation is conducted during the regenerative operating mode of the induction machine. In the first place, a regulated AC current component is injected into the q-axis current component of the induction machine, which induces the current and voltage ripple components in the DC-link. By processing these AC signals through digital filters, the ESR can be estimated by a recursive least squares (RLS) algorithm. To acquire the AC voltage across the ESR, the DC-link voltage needs to be measured at a double sampling frequency. In addition, the ESR current is simply reconstructed from the stator currents and switching states of the inverter. Experimental results have shown that the estimation error of the ESR is about 1.2%, which is quite acceptable for condition monitoring of the capacitor.
机译：本文提出了一种在线估计带有前端二极管整流器的感应电机（IM）驱动系统中直流链电容器等效串联电阻（ESR）的新方法，该方法是在电感二极管驱动期间进行的。感应电机的再生运行模式。首先，将经过调节的交流电流分量注入到感应电机的q轴电流分量中，从而在直流母线中感应出电流和电压纹波分量。通过通过数字滤波器处理这些AC信号，可以通过递归最小二乘（RLS）算法估算ESR。为了获取ESR两端的交流电压，需要以两倍采样频率测量直流母线电压。此外，只需从定子电流和逆变器的开关状态中重建ESR电流即可。实验结果表明，ESR的估计误差约为1.2％，这对于电容器的状态监测是完全可以接受的。

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