Estimation of ESR in the DC-Link Capacitors of AC Motor Drive Systems with a Front-End Diode Rectifier

Title
Estimation of ESR in the DC-Link Capacitors of AC Motor Drive Systems with a Front-End Diode Rectifier
Author(s)
이동춘누옌탄하이리쿠억안
Keywords
ALUMINUM-ELECTROLYTIC-CAPACITORS; PWM CONVERTERS; FAULT-DIAGNOSIS; MACHINE DRIVES; INJECTION; INVERTER
Issue Date
201503
Publisher
KOREAN INST POWER ELECTRONICS
Citation
JOURNAL OF POWER ELECTRONICS, v.15, no.2, pp.411 - 418
Abstract
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.
URI
http://hdl.handle.net/YU.REPOSITORY/33054http://dx.doi.org/10.6113/JPE.2015.15.2.411
ISSN
1598-2092
Appears in Collections:
공과대학 > 전기공학과 > Articles
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