An H-Bridge-based single-phase VAr generator with minimum DC capacitance

Yunting Liu, Xiaorui Wang, Fang Zheng Peng

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Conventional single-phase H-bridge applications have second-order harmonic ripple power on the dc bus. The second-order harmonic power is usually filtered by a bulk capacitor on the dc bus to maintain a constant dc-bus voltage, which results in low power density. However, in applications like VAr generator, a larger dc-bus voltage fluctuation is acceptable since the dc bus connects to no load. This paper releases the constraints on dc-bus voltage fluctuation so that the dc-bus capacitor can be fully utilized. Based on this idea, an H-bridge-based single-phase VAr generator with minimum dc capacitance is proposed, which reduces the dc-bus capacitor to 1/10th of the size compared to that of the sinusoidal pulse width modulation (SPWM)-modulated H-bridge inverter, without increasing components' count. A general modulation method of the proposed VAr generator is derived to utilize the fluctuating dc-bus voltage. The system volume and power loss are assessed to compare with the conventional SPWM-modulated H-bridge and the circuits with power-decoupling cells. A proportional-integral controller is applied to the system to control the input ac current. The analysis and design are validated by simulations and experiments.

Original languageEnglish (US)
Article number8326488
Pages (from-to)2001-2014
Number of pages14
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Issue number4
StatePublished - Dec 2018

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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