An Advanced Static Synchronous Compensator Model to Reuse Newton and Decoupled Power Flow Codes

Abstract To reduce the complexities of the computer program codes for a Newton Raphson load flow analysis of a network containing static synchronous compensators (STATCOM), a Newton power flow model of a STATCOM is proposed, which transforms an existing power system installed with one or more STATCOM into an augmented equivalent network without any STATCOM. The absence of STATCOM(s) enables the existing Newton Raphson load flow codes to be reused to solve the original network containing STATCOM(s). Consequently, the complexities of the computer program codes are reduced substantially. Subsequent application of decoupling techniques renders the elements of the Jacobian matrices constants, which are known a priori. This enables the original network containing STATCOM(s) to be solved by reusing the existing fast decoupled load flow codes. As a result, drastic reduction in the complexities of the computer program codes takes place. Both of the proposed models—the Newton and the decoupled power flow models—can handle multiple control functions, STATCOM converter switching losses, losses in the coupling transformer, and various practical device limit constraints of the STATCOM. The feasibility of the proposed models has been validated on the IEEE 118- and 300-bus systems.