Power system voltage stability is an important factor for maintaining high standards of power quality supplied to the consumer. Among many FACTS devices which can provide reactive power compensation to maintain the voltage stability the STATCOM is quite fast and efficient. In the previous works regarding the subject many control methods of STATCOM have been described among which many are Proportional-Integral Controllers. But the problem with these previous works is that they obtain the PI control parameters/gains by trial& error or by detailed studies but with compromise in balance of performance and applicability.
Thus the control parameters for an optimal result at a given operating point may not be efficient at a different point of operation. This paper proposes a relatively new model of controlling the STATCOM via dynamic PI control, which has the capability to dynamically adjust and adapt the control parameters during a disturbance such that the result/performance always matches the desired response, regardless of different or changing point of operating conditions such a transmission network change, varying load levels, different intial control parameters, consecutive and severe disturbances.
While the traditional STATCOM control with fixed and tuned PI parameters may give a fine performance in the original system, but may not perform as effective as the proposed control method when the system conditions are changed.
Voltage stability, control method, STATCOM, PI Control
