Title :
Development of a D-STATCOM prototype based on cascade inverter with isolation transformer for unbalanced load compensation
Author :
Xu, Shukai ; Song, Qiang ; Zhu, Yongqiang ; Liu, Wenhua
Author_Institution :
Dept. of Electr. Eng., Tsinghua Univ., Beijing
Abstract :
This paper describes the distribution level static compensator (D-STATCOM) of three-phase three-wire distribution system for unbalanced load compensation. First, a novel transformer-isolated multilevel H-bridges inverter is introduced, which is suitable for large unbalanced load compensation. For solution to improve the power quality at the point of common coupling (PCC), the compensation scheme is proposed with dual d-q transformation and symmetrical components method. In addition, the balancing design method is employed to equalize the phase currents of triangle connection transformer. Then the computer simulation system is built with software PSCAD to test the functions of the D-STATCOM. Finally, the hardware prototype is made based on two H-bridges voltage source inverter with 1700 V/75 A IGBT. The switching frequency of the space vector modulation (SVM) PWM is set at 500 Hz to generate the compensation currents. The DSP and FPGA based system is employed as the controller. Simulation and experimental results are also given to validate the effectiveness of the proposed D-STATCOM
Keywords :
PWM invertors; bridge circuits; cascade networks; digital signal processing chips; field programmable gate arrays; insulated gate bipolar transistors; power distribution; power supply quality; power system CAD; power transformers; static VAr compensators; switching convertors; 1700 V; 500 Hz; 75 A; D-STATCOM prototype; DSP; FPGA; PWM; balancing design method; cascade inverter; computer simulation system; distribution level static compensator; hardware prototype; isolation transformer; multilevel H-bridges voltage source inverter; phase current equalization; point of common coupling; power quality; software PSCAD; space vector modulation; switching frequency; three-phase three-wire distribution system; unbalanced load compensation; Automatic voltage control; Computer simulation; Design methodology; Load management; PSCAD; Power quality; Prototypes; Pulse width modulation inverters; STATCOM; Software testing; Distribution level static compensator (D-STATCOM); d-q transformer; isolation transformer; symmetrical components method.; unbalanced load compensation;
Conference_Titel :
Industrial Technology, 2005. ICIT 2005. IEEE International Conference on
Conference_Location :
Hong Kong
Print_ISBN :
0-7803-9484-4
DOI :
10.1109/ICIT.2005.1600791
