Thermal power unit power prediction control system for ensuring safety and stability of sending-end electric grid

Abstract

The invention discloses a thermal power unit power prediction control system for ensuring the safety and stability of a sending-end electric grid. The thermal power unit power prediction control system comprises a high-frequency emergency state and prediction unit (1), a speed regulator prediction control unit (2) and a boiler prediction control unit (3), wherein the high-frequency emergency state and prediction unit (1) is electrically connected with the speed regulator prediction control unit (2) and the boiler prediction control unit (3); the speed regulator prediction control unit (2) is electrically connected with a servo of a speed regulating mechanism; and the boiler prediction control unit (3) is electrically connected with a boiler and an auxiliary machinery. According to the invention, when the sending-end electric grid is split, the power naturally distributed to a unit by the sending-end electric grid is measured, unit prediction power setting for keeping isolated grid balance and equitable distribution is obtained through conversion, fast and accurate control regulation is carried out through a unit prediction control method on a steam turbine and the boiler, so that the dynamic energy balance among the boiler, the steam turbine and the sending-end electric grid is effectively ensured, the problem of oscillation of OPC (Overspeed Protection Control) is solved, and the high-frequency stable level of the sending-end electric grid and the safety of the unit are greatly enhanced.

Description

technical field [0001] The invention relates to the field of power grid safety control and the thermal control field of a steam turbine generator set, in particular to a thermal power unit power prediction control system for ensuring the safety and stability of a sending end power grid. Background technique [0002] The power generated by the turbo-generator unit in the sending-end power grid is sent to the receiving-end power grid through the power grid. If the sending-end power grid and the receiving-end power grid fail to separate or the load line trips in the isolated grid state, the power of the turbo-generator exceeds the load. It will cause the frequency of the grid and the speed of the unit to increase. If the grid power is unbalanced, the excessively high speed will endanger the safety of the steam turbine blades and cause the machine to be cut, thereby causing high-frequency instability of the grid. [0003] In the high-frequency state of the power grid, the oversp...

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Problems solved by technology

[0006]The technical problem to be solved by the present invention: Provide a thermal power unit power predictive control system to ensure the safety and stability of the power grid at the sending end to solve the problem of The slowness of the power adjustment process of the steam turbine leads to too high speed, which causes safety problems of the steam turbine blades; the slowness of the energy adjustment process of the boiler causes the main steam pressure to be too high, resulting in the action of the safety door, which easily leads to problems such as unit shutdown

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