Subsynchronous oscillation method and apparatus for static synchronous series compensator suppression system

Abstract

The invention relates to a subsynchronous oscillation method and apparatus for a static synchronous series compensator suppression system. The subsynchronous oscillation method comprises the steps of taking an included angle between an SSSC (static synchronous series compensator) output voltage and an alternating current circuit current, and modulation ratio of the SSSC as generator influencing parameters by the SSSC according to a system linear model of an SSSC-containing single-machine infinite-bus system; taking voltage frequency deviation and active power flow of an SSSC apparatus mounting point as SSSC modulation ratio influencing parameters; taking the voltage frequency deviation and active power flow of the SSSC apparatus mounting point as input to establish a transfer function of a damping controller, wherein the voltage frequency deviation and the active power flow of the SSSC apparatus mounting point are taken as input of the damping controller; and optimizing control parameters of the transfer function of the damping controller. By adoption of the technical scheme provided by the invention, the power grid operating damping and stability can be improved; meanwhile, the damping characteristic of the power grid in a region where the static synchronous series compensator is located is optimal; and the subsynchronous oscillation method is also applicable to design of an actual controller.

Description

technical field [0001] The invention relates to the technical field of flexible AC power transmission, in particular to a static synchronous series compensator suppressing a system subsynchronous oscillation method and device. Background technique [0002] In recent years, with the rapid development of the power system and the increase of power flow demand, in order to improve the power transmission capacity of the system, reactive power compensation devices in the form of series and parallel have been widely used. Static synchronous series compensator (SSSC), as a new type of series reactive power compensation device, has the advantages of flexible control, simple structure, fast and effective regulation of system power flow, and can suppress subsynchronous oscillation (SSR) to a certain extent. There is no capacitance in SSSC that may have subsynchronous oscillation with the inductance parameters of the AC system, which reduces the probability of subsynchronous oscillation...

AI Technical Summary

Problems solved by technology

Although the time-domain analysis method based on power electronic devices has a more accurate judgment basis, it cannot directly obtain the relationship between damping and frequency, which is not conducive to judging from the physical sense

[0003] At present, in the research methods for the SSR problem and the design of the damping controller of the SSSC system, some only consider the single-machine infinite system model when the amplitude and the modulation ratio are input from the system point of view; some methods propose the SSR based on the test signal method. Design of multi-mode damping control parameters; some methods design control parameters from an empirical point of view; these methods will consider the main factors of SSR, which actually simplifies the problem, and may not be able to find the optimal control amount of damping control parameters

Images