Design of Adaptive PI Controller of STATCOM for Voltage Stability

Abstract

In power system, voltage stability is considered as performance measurement parameter.
Hence to achieve voltage stability, Static Compensator (STATCOM) is used. In last few
years, STATCOM has been used to enhance the performance of the power system. It can
regulate a system’s voltage by providing fast and efficient power support. However,
previously there are many different STATCOM control systems that have been studied which
includes fundamental Proportional Integral (PI) controller. The experimentation approach to
obtain the PI gains or studies with trade off of relevance and execution. Hence, the
performance at an operating point for some control parameters may vary for same control
parameter at different operating point. To improve performance of control system at different
operating conditions, this study proposes the control model which can self-adjust the control
gains such that always give desired response during disturbances. The simulations results of
the adaptive PI control for different operating conditions such as transmission network, load
level, control gain, severe and consecutive disturbances shows excellent consistence. The
conventional STATCOM perform well for same operating condition, but when it comes for
system condition change proposed control method shows upper hand over previous
conventional method.