A new approach to PID controller design of STATCOM

As a common reactive power compensation equipment in power system, the static synchronous compensator (STATCOM) has played a very important role in the stable operation of power system, which requires fast response and well-designed controller. This paper presents a new approach to proportional-integral-derivative (PID) controller design of STATCOM based on root counting and signature theory with the help of computer-aided calculation. The complete coefficient set of stabilizing PID controllers can be found, which is superior to the traditional trial and error method. The performance specification could be considered within the entire stabilizing set to identify the desired values of coefficient gains of PID controller. Case study is implemented to illustrate and verify the feasibility of the proposed approach.