Multilevel monitor-control method for monitoring and controlling hyposynchronous oscillation of synthesis power generating plant and electric network information

Abstract

The invention relates to a safety monitoring measure of sub-synchronous oscillation / resonance (SSO / SSR) in an electric power system, and discloses a sub-synchronous oscillation multi-level monitoring method of identifying the sub-synchronous oscillation and adopting control and protective measures by a power plant side in coordination with a power grid side. The method comprises the following steps: arranging a unit shafting torsional stress relay (TSR) and a bypass controller in the power plant and the power grid; adequately utilizing the characteristic that the TSR has the highest sensitivity of detecting the sub-synchronous oscillation; identifying different stages of the sub-synchronous oscillation by the TSR setting; adopting different measures including a power plant side warning, bypass serial compensation capacitor or other power electronic devices on the power grid side and removing a set from the power plant according to the different stages of the sub-synchronous oscillation. The method can smartly and accurately identify the sub-synchronous oscillation in the power plant and the power grid, determine the corresponding strategy and measures according to the extent of damage of the sub-synchronous oscillation, and provide an effective method for the power plant and the power grid to harmoniously monitor the sub-synchronous oscillation.

Description

technical field [0001] The invention relates to the application fields of electric power system, large-scale thermal power plant, series compensation transmission, direct current transmission and electric power electronic technology, and electric power field related to power system subsynchronous oscillation (SSO / SSR). Background technique [0002] Large-scale thermal turbine technology is one of the key equipment of major equipment in my country. The shafting of high-power units has the characteristics of light weight and flexibility, multiple supports, large span, and high power density. The utilization factor of generator materials is improved, and the cross-sectional power of the shafting The density is relatively increased, the lengthening of the shaft system reduces the torsional stiffness, the natural frequency spectrum of the shaft system is relatively dense, and the energy induced by vibration is low; at the same time, the ultra-high voltage long-distance transmission...

AI Technical Summary

Problems solved by technology

At present, the power plant and the power grid operation department still lack the technical means to detect subsynchronous oscillation. This patent provides a measure and method for multi-level monitoring subsynchronous oscillation of the combined power plant control center and grid control center.

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