Title: Study on the synchronous closing strategy of 10 kV reactive power compensation capacitor banks

Authors: Qinjun Du; Shuai Xu; Yang Wang

Addresses: School of Electrical and Electronic Engineering, Shandong University of Technology, 12 Zhangzhou Road, Shandong Zibo, 255091, China ' School of Electrical and Electronic Engineering, Shandong University of Technology, 12 Zhangzhou Road, Shandong Zibo, 255091, China ' School of Electrical and Electronic Engineering, Shandong University of Technology, 12 Zhangzhou Road, Shandong Zibo, 255091, China

Abstract: In this paper, we propose a closing strategy when the compensation capacitor and system voltage come to the peak voltage, the method of capacitor banks synchronous closing sequence is analysed, and the shortest delay time to switch closing in optimal phase is given. In order to improve the breaker synchronous closing precision, the adaptive digital AC voltage zero crossing detection is adopted to acquire the zero point of the reference signal, and the method of multi-element liner regression is handled to dynamic predict the breaker operating time and trend. Theoretical analysis and simulation result show that the transient overvoltage and inrush current when closing capacitor banks at peak voltage are decreased effectively, which offers the basis of theory and software algorithms for the development of a synchronous switching control system of compensation capacitor.

Keywords: reactive power compensation; capacitor banks; breaker synchronous closing; zero crossing detection; motion control; peak voltage; synchronous switching control.

DOI: 10.1504/IJMIC.2016.081143

International Journal of Modelling, Identification and Control, 2016 Vol.26 No.4, pp.353 - 360

Received: 23 Nov 2015
Accepted: 25 Jan 2016
Published online: 24 Dec 2016 *

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