Full-controlled variable current device based sub-synchronous oscillation suppression method for generating set

Abstract

The invention relates to a generating set sub-synchronous oscillation suppression method adopting a full-controlled variable current device. The method uses the variable quantity of a rotating speed signal of a generating set as a control quantity, and performs filter, phase shift, proportional amplification and operation processing on the variable quantity of the rotating speed signal to acquire a control signal for controlling a variable current power unit by using a voltage synchronization signal as standard, then the full-controlled variable current device generates a sub-synchronous model modulation current, and the current affects the rotating speed of the generating set through a power transmission unit so as to achieve the aim of suppressing the sub-synchronous oscillation of the generating set. A controller comprises a plurality of signal processing subunits and a main control subunit, wherein each signal processing subunit comprises a filter module, a phase shift module, a proportional amplification module and an operation module; and the main control subunit accomplishes the control for the full-controlled device. The method can effectively suppress the sub-synchronous oscillation problem of a power grid system, has high response speed and high tracing precision, and can greatly improve the stability and reliability of a power grid.

Description

technical field [0001] The invention relates to a method for suppressing subsynchronous oscillation of a generator set, in particular to a method for suppressing subsynchronous oscillation of a generator set using a fully-controlled converter device. Background technique [0002] With the development of the power system, the operation of ultra-high voltage, long-distance transmission lines and large-capacity generator sets, as well as measures such as line series capacitance compensation and direct current transmission to improve the stability and transmission capacity of the power system, in addition to the accompanying In addition to the huge economic benefits, it also brings new problems to the safe and stable operation of the power system, one of which is the subsynchronous oscillation of the power system. Series capacitor compensation may cause sub-synchronous resonance in the power system, and then damage the shafting of the turbogenerator. Subsynchronous oscillations...

AI Technical Summary

Problems solved by technology

At the same time, FC needs to filter out the harmonic components generated by SVC itself, and has the disadvantages of large installation capacity and large floor space.

[0006] 2) Generally speaking, after SVC is equipped with FC, the compensation range of SVC is generally 0~+100%, and the compensation range is small

When sub-synchronous oscillation occurs in the power grid, the grid voltage changes greatly, and the ability of SVC to suppress sub-synchronous oscillation is greatly weakened during the voltage valley.

Images