Coordinated Control Strategies with and without Circulating Current in Unified Power Quality Conditioners

Xing-tian Feng; Zhi-hua Zhang

Coordinated Control Strategies with and without Circulating Current in Unified Power Quality Conditioners

Xing-tian Feng

Zhi-hua Zhang

Vol. 15, No. 5, pp. 1348-1357, Sep. 2015

10.6113/JPE.2015.15.5.1348

Circulating current

Coordination control

Optimization condition

power allocation

Reactive power compensation

Super-capacitor energy storage

Unified Power Quality Conditioner

PDF

Abstract

Under traditional unified power quality conditioner (UPQC) control, a UPQC series converter (SC) is mainly used to handle grid-side power quality problems while its parallel converter (PC) is mainly used to handle load-side power quality problems. The SC and PC are relatively independent. The SC is usually in standby mode and it only runs when the grid voltage abruptly changes. In this paper, novel UPQC coordinated control strategies are proposed which use the SC to share the reactive power compensation function of the PC especially without grid-side power quality problems. However, in some cases, there will be a circulating current between the SC and the PC, which will probably influence the compensation fashion, the compensation capacity, or the normal work of the UPQC. Through an active power circulation analysis, strategies with and without a circulating current are presented which fuses the reactive power allocation strategy of the SC and the PC, the composite control strategy of the SC and the compensation strategy of the DC storage unit. Both of the strategies effectively solve the SC long term idle problem, limit the influence of the circulating current, optimize all of the UPQC units and reduce the production cost. An analysis, along with simulation and experimental results, is presented to verify the feasibility and effectiveness of the proposed control strategies.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

X. Feng and Z. Zhang, "Coordinated Control Strategies with and without Circulating Current in Unified Power Quality Conditioners," Journal of Power Electronics, vol. 15, no. 5, pp. 1348-1357, 2015. DOI: 10.6113/JPE.2015.15.5.1348.

[ACM Style]

Xing-tian Feng and Zhi-hua Zhang. 2015. Coordinated Control Strategies with and without Circulating Current in Unified Power Quality Conditioners. Journal of Power Electronics, 15, 5, (2015), 1348-1357. DOI: 10.6113/JPE.2015.15.5.1348.