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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. Introduction With continuous development of distributed power technology, the power distribution network has gradually developed from passively to actively. Photovoltaic (PV) generation system is an important distributive generation form of active power distribution network [1]. However, voltage stability problems of weak bus in power distribution network can be influenced by large scale of distributed PV power [2]. Bus voltage variety can be easily caused when PV generation system access in power distribution network. Dynamic performance of PV plant becomes more complicated when integrated to weak buses of power distribution network, which is often associated with stability issues. For one thing, in weak distribution network, the magnitude of point of common coupling (PCC) voltage turns highly sensitive to active and reactive power output from PV plant, which leads to large fluctuation of PV plant PCC voltage [3]. For another, the transmission line will consume large amounts of reactive power, which decreases PV plant voltage stability limit as well as active power transfer capacity [4]. However, Reactive power output by PV plant is usually confined considering the capacity of power converter. Reactive power compensation is one of the major issues concerning a PV plant connected to weak bus of distribution network. Flexible AC Transmission System (FACTS) facility is needed to apply in PV plant to provide reactive power. Static Synchronous Compensator (STATCOM) application is able to satisfy reactive power requirements and improve voltage dynamic performance of PV plant. Some papers have investigated effect of STATCOM on PV plant dynamic performance. In [5], simulation results showed that the STATCOM helps to improve dynamic characteristics of PV plant during severe faults. In [6]-[7], the author discussed the effectiveness of STATCOM in terms of fast damping the power system oscillations and restoring stability. In [8], STATCOM application for improving stability of PV plant fed to a multi-machine system is investigated. However, these papers

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