Reactive Power Compensation with Improvement of Current Waveform Quality for Single-Phase Buck-Type Dynamic Capacitor

Xinwen Chen, Ke Dai, Chen Xu, Ziwei Dai, Li Peng

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

6 Citations (Scopus)


Due to relatively low cost and flexible performance, Dynamic Capacitor (D-CAP) is often designed to implement dynamic reactive power compensation, whose output current might distort under the effects of background harmonic voltage from the grid or non-ideal PWM mode caused by non-linear switch characteristics. This paper presents a reactive power compensation control strategy with waveform quality amelioration of output capacitive current for single-phase Buck-type D-CAP. Through establishing basic control equations, reactive power compensation principle and equivalent model of single-phase Buck-type D-CAP are analyzed. In order to suppress output harmonic current, duty ratio of Buck-type D-CAP is generated by means of introducing Even Harmonic Modulation (EHM). Then a selective current control strategy in multiple synchronous reference frames is adopted to track reactive power compensation current reference with nearly zero steady-state error and alleviate output current distortion with demanded harmonic components. Finally, a series of experimental results from single-phase Buck-type D-CAP laboratory prototype are provided to verify the validity of dynamic reactive power compensation and almost sinusoidal output current waveform optimizing method.
Original languageEnglish
Title of host publication2016 IEEE Applied Power Electronics Conference and Exposition (APEC)
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Electronic)978-1-4673-9550-2
ISBN (Print)978-1-4673-8393-6
Publication statusPublished - 2016
Externally publishedYes


  • Buck-type dynamic capacitor
  • reactive power compensation
  • current waveform improvement
  • even harmonic modulation
  • selective current tracking control


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