Research on the control strategy of the transformer-isolated multilevel H-bridges DSTATCOM for three-phase unbalanced load compensation

Author

Yang, Xiao-ping ; Feng, Fan ; Duan, Xian-Feng ; Tian, Lu-lin

Author_Institution

Xi´´an Univ. of Technol., Xi´´an, China

fYear

2008

fDate

10-13 Dec. 2008

Firstpage

1

Lastpage

6

Abstract

A novel control strategy is proposed based on topology of transformer-isolated multilevel H-bridge inverter for DSTATCOM. Rotating coordinate transformation is used to determine the compensation currents for unbalanced load. A control method of single-phase instantaneous reactive power theory is designed to improve the dynamic response speed of DSTATCOM. According to the structural characteristics of the main circuit of inverter, a technique of carrier phase-shifting PWM is put forward to eliminate harmonic. Finally, the simulation results show that the validity of the proposed control strategy, this method can be applied to compensate power quality problems in three-phase three-wire system.

Keywords

PWM invertors; bridge circuits; compensation; dynamic response; power conversion harmonics; power transformers; reactive power; static VAr compensators; control strategy; distribution static compensation; dynamic response; harmonic elimination; inverter circuit structural characteristics; phase-shifting PWM; power quality compensation; reactive power theory; three-phase three-wire system; three-phase unbalanced load compensation; transformer-isolated multilevel H-bridges DSTATCOM; Circuit simulation; Circuit topology; Load management; Network topology; Phase modulation; Power system harmonics; Pulse width modulation inverters; Reactive power; Reactive power control; Support vector machines; Distribution static compensation (DSTATCO-M); carrier phase-shifted; instantaneous reactive power; isolating transformer; unbalanced load;

fLanguage

English

Publisher

ieee

Conference_Titel

Electricity Distribution, 2008. CICED 2008. China International Conference on

Conference_Location

Guangzhou

Print_ISBN

978-1-4244-3373-5

Electronic_ISBN

978-1-4244-3372-8

Type

conf

DOI

10.1109/CICED.2008.5211729

Filename

5211729