高速移相器を用いた連系線潮流制御による連系系統の周波数動揺安定化制御

抄録

Nowadays, the electric power industry is in transition to a deregulated market. Under this circumstance, the power system control such as frequency control will be served as an ancillary service, as well as the configuration of power system will be changed by the proliferation of the Independent Power Producers (IPPs). In this paper a control method using a solid-state phase shifter to provide an active control facility of system frequency, is proposed. In the Load Frequency Control (LFC), the interconnections among some areas are the inputs of disturbances, therefore, it is important to suppress the disturbances by the coordination of governor systems so far. On the contrary, the power flow control by the phase shifter located between two areas makes it possible to stabilize the system frequency positively through the interconnection, which is also expected as a facility to provide a new ancillary service for the power systems. This paper proposes a method to design the frequency stabilization by the phase shifter based on an elementary two area system and an elementary three area loop system, which is extended to the design of general multi-area system by applying a system reduction method. A frequency stabilization controller of phase shifter is designed based on stabilization of an inter-area oscillation mode between interconnected areas. Numerical results demonstrate the significant effect of the proposed control on the frequency stabilization of interconnected power systems.