Abstract:  This paper first analyzes the stability problems of electromagnetic loop network and the characteristics of VSC-HVDC system. Then, this paper puts forward the necessity of coordinated control of VSC-HVDC and stability control system when VSC-HVDC applied in electromagnetic loop network, and presents the coordinated control method of VSC-HVDC and stability control system, the calculation principle of measure quantity, as well as the alculation method of the coordinated control measures for transient stability. The numerical calculation of coordinated control measures based on equal area criterion considers the influences of action time delay and the reactance of the system, which can make the calculation results more accurate and the maximum use of the capacity of VSC power support for the power system in transient process. Finally, this paper adopts BPA simulation tool to establish the mechanical and electrical simulation model of VSC-HVDC applied in electromagnetic loop network. The simulation results show that the coordination control of VSC-HVDC and stability control systemwill reduce total number of the generator cutting compared to traditional stability control, and improve the voltage stability of AC system, which has a good engineering and practical value.

Key words:  electromagnetic loop network, VSC-HVDC, transient stability, stability control strategy, coordinated control