Abstract
This paper presents an improvement in harmonic compensation performance of a previously proposed smart charger (SC) with a constant dc-capacitor voltage-control (CDCVC) strategy for electric vehicles (EVs) in single-phase three-wire distribution feeders (SPTWDFs). A controller for 3rd harmonic currents in d-q coordinates is added to the previously proposed SC. This addition improves harmonic compensation performance of the source currents. We briefly introduce harmonic current compensation using the previously proposed CDCVC-based algorithm for the SC. Then, the basic principles of the proposed controller for the 3rd harmonic currents in d-q coordinates are discussed in detail. It is shown that synchronization of the current controllers for both the fundamental and 3rd harmonic components is required. The switching frequency of a three-leg pulse-width modulated rectifier with a bidirectional dc–dc converter, which performs the SC, is determined considering the synchronization of the current controllers. Simulation and experimental results demonstrate that balanced and sinusoidal source currents with a unity power factor are achieved during both battery charging and discharging operations in EVs, improving the harmonic compensation performance of the previously proposed SC. Experimental results also demonstrate that the total harmonic distortion values of source currents are improved by 8.4% and 3.6% with the proposed controller for 3rd harmonic currents, when the SC is discharging, for example.
Highlights
Single-phase three-wire distribution feeders (SPTWDFs) with pole-mounted distribution transformers (PMDTs) are widely used for home appliances in Japan
The validity and high practicality of the proposed PI controllers in d-q coordinates for the 3rd harmonic components of the currents in the proposed smart charger (SC) are confirmed by computer simulation using the PSIM software
This paper has introduced an improvement in the harmonic compensation performance of the previously proposed SC with a constant dc-capacitor voltage-control (CDCVC) strategy for electric vehicles (EVs) in single-phase three-wire distribution feeders (SPTWDFs)
Summary
Single-phase three-wire distribution feeders (SPTWDFs) with pole-mounted distribution transformers (PMDTs) are widely used for home appliances in Japan. The authors dealt with harmonic current compensation with a CDCVC-based strategy in SPTWDFs with diode rectifiers [2]. The 3rd harmonic currents are dominant in single-phase circuits while the 5th and 7th harmonic currents are dominant in three-phase circuits Suppressing these 3rd harmonic currents of the sources is necessary to improve the THD values in SPTWDFs. In this paper, an improvement in harmonic compensation performance of the proposed SC with a CDCVC strategy is presented. Addition of the current controller for the 3rd harmonic currents improves the harmonic compensation performance of the CDCVC strategy. Simulation and experimental results demonstrate that balanced and sinusoidal source currents with a unity PF are obtained during both battery charging and discharging operations in EVs, thereby improving the harmonic compensation performance of the SC
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