Method and system for monitoring low-frequency oscillation of turbo generator set speed control system

Abstract

The invention provides a method and a system for monitoring low-frequency oscillation of a turbo generator set speed control system. The method comprises the following steps: an original power signal and an original valve opening signal on the side of a turbo generator set speed control system are acquired, and down-sampling rate processing is carried out on the original power signal and the original valve opening signal respectively to obtain a power signal and a valve opening signal; Wigner-Ville distribution transform is performed on the power signal and the valve opening signal respectively to obtain a first time-frequency distribution characteristic of energy of the power signal and a second time-frequency distribution characteristic of energy of the valve opening signal; and low-frequency oscillation of the turbo generator set speed control system is monitored according to the first time-frequency distribution characteristic and the second time-frequency distribution characteristic. By adopting the scheme of the invention, effective real-time monitoring of low-frequency oscillation of the turbo generator set speed control system is realized, the economic efficiency can be improved, and the grid security can be ensured.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and system for monitoring low-frequency oscillation of a speed regulation system of a steam turbine generator set. Background technique [0002] The phenomenon of low-frequency oscillation occurs from time to time in various regional power grids, which seriously affects the safe and stable operation of the power grid. Effective monitoring of low-frequency oscillations in power systems is the basis for analyzing and suppressing low-frequency oscillations. At present, the monitoring of low-frequency oscillations in power systems is mainly based on the Wide Area Measurement System (WAMS). The wide area measurement system consists of a synchrophasor measurement unit (Phasor Measurement Unit, PMU), a communication network, and a WAMS master station. PMU devices are installed in the main substations and power plants of the power grid. By measuring physical quantities...

AI Technical Summary

Problems solved by technology

Improper setting of the parameters of the turbo-generator speed control system or the presence of disturbance sources within the low-frequency oscillation frequency range may cause low-frequency oscillations in the power system, which seriously threatens the safety of the combined power grid of the turbo-generator. A series of vicious accidents have caused huge economic losses

However, the monitoring of low-frequency oscillation from the side of the turbogenerator speed control system has not been paid attention to at present

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