A Coordinated Control Method of Static Synchronous Compensator and Capacitor Bank in Station

Abstract

The invention relates to a coordinative control method for a static synchronous compensator and an in-station capacitor bank, and belongs to the technical field of power grid stability control of power systems. According to the method, when the bus voltage deviation rated value of an access point is smaller than 10% and the STATCOM runs in a steady-state voltage control mode, the STATCOM and the in-station capacitor bank are coordinatively controlled. The reactive response speed difference of the STATCOM and capacitors are considered; and during steady-state voltage control, the capacitor bank outputs reactive power as far as possible, and maximum dynamic reactive standby capacity is achieved by replacement to meet transient voltage stability control demands of transient faults of a power grid. The method has the characteristics of clear physical significance, simplicity for realization, excellent performance and the like; and when the method is applied to system power stability control and dynamic reactive power storage, the system voltage can be effectively kept in a reasonable range, and the system keeps the storage of a large amount of dynamic reactive power, so that the transient voltage stability of the power grid is effectively improved.

Description

technical field [0001] The invention relates to a method for coordinated control of a static synchronous compensator and a capacitor bank in a station, in particular to a control method for a static var compensator and a capacitor bank in a station under different voltage levels of a power grid, and belongs to the technical field of power grid stability control of a power system . Background technique [0002] The static var compensator (STATCOM) with turn-off devices (IGBT, IGCT) as switching devices is a typical application of modern power electronics technology in power systems, which can help the grid to achieve dynamic reactive power continuous regulation and improve grid voltage stability. , Suppressing the low-frequency power oscillation of the line is one of the main means to realize the controllability and intelligence of the power grid. [0003] When the system has a sudden load increase, short circuit and other factors that cause voltage fluctuations, the system ...

AI Technical Summary

Problems solved by technology

When the system voltage fluctuates, if there is no coordinated control between the static synchronous compensator (STATCOM) and the capacitor bank in the station, the static synchronous compensator (STATCOM) will output a large amount of dynamic reactive power or even output rated dynamic reactive power while the fixed capacitor bank will not In this case, the static synchronous compensator (STATCOM) cannot play the role of storing a large amount of dynamic reactive power to deal with transient faults