Voltage Stability Analysis of Photovoltaic Plant with STATCOM Connected to Weak Buses of Distribution Network

QING-HE OU, BIN WU, CHUAN-KE DUAN, JIAN ZHANG, XIAO-FENG YIN, XING-DE YAN

Abstract


This paper investigates effect of static synchronous compensator (STATCOM) application on voltage stability of photovoltaic (PV) plant connected to weak buses. With integrated to weak grid, PV plant always confront security and stability problems, as the point of common coupling (PCC) voltage is sensitive to PV plant power output, which leads to large variation of PV plant PCC voltage. Meanwhile, PV plant voltage static stability limit and power transmit limit decrease with increase of grid impedance. STATCOM application in PV plant is able to stabilize PCC voltage magnitude by providing reactive power, which contributes to improving PV plant voltage stability. To research effect of STATCOM on PV plant performance, a simplified system of PV plant connected to weak grid with STATCOM application is modeled in Matlab/Simulink. The system is studied in the case of different grid strengths and PV plant power output with small disturbance in grid. Simulation results show that STATCOM application in PV plant connected to weak grid can reduce the variation of PCC voltage and increase PV plant voltage stability limit as well as power transmit limit under low SCR condition.

Keywords


PV plant, STATCOM, Weak busText


DOI
10.12783/dtetr/ecae2018/27728

Full Text:

PDF

Refbacks

  • There are currently no refbacks.