Optimal Control of Generators and Series Compensators within Multi-space-time Scale

The operation of modern power grid is becoming more complicated and difficult, for such as the fluctuation caused by large-scaled wind power integration. So, a coordinated optimal control method focused on traditional controllers and FACTS (Flexible Alternative Current Transmission Systems) is proposed combined of their different merits both in time and space scale. For easier study, only the generator, FSC (Fixed Series Compensation) and TCSC (Thyristor Controlled Series Compensation) is considered in this paper. Firstly, the coordination of different space scale is studied, where the bulk power grid is divided into several sub-regions and a kind of two-layer frame is presented. Then, the coordination of different time scale is also studied, where the time dimension is divided into three layers including day-ahead schedule (24hour), short-term dispatch (5–15min), and generation control (5–20sec). After that, the correctness and improvement of these methods are verified in IEEE-39 bus case. Finally, the simulation case on real power grid of SGCC is carried on with PSASP software, and the effectiveness is analyzed.