System and method for stabilizing frequency and voltage of system during large load phase step of isolated power grid system

Abstract

The invention discloses a system and a method for stabilizing frequency and voltage of the system during large load phase step of the isolated power grid system. The method includes: S1, increasing evaporation capacity of a boiler, starting a bypass system to maintain stability of steam pressure and automatically regulating opening of a bypass valve via a pressure control mode; and S2, opening a regulating valve of a steam turbine after a DEH (digital electric hydraulic) speed regulating system detects that the rotation speed of a generator set is reduced, and simultaneously reducing the opening of the bypass valve under a pressure feedback effect of the bypass system. By the aid of a large-capacity energy storage effect of the bypass system, the bypass valve is opened quickly, load of the boiler is reduced, and the system is protected against being in an over-voltage state; the bypass valve is closed quickly, output power of the generator set is quickly adjusted, large motor load is carried, balance of total power supply quantity is realized, and accordingly an isolated power grid outputs current with stable frequency and voltage under the condition of large load phase step; and required high power electric energy does not need to be outputted in advance, heat dissipation of the generator set of the isolated power grid can be realized effectively, debugging of the set is carried out conveniently, and cost is saved.

Description

technical field [0001] The invention relates to a method and a system for stabilizing system frequency and voltage when an isolated grid system has a large load step, and belongs to the technical field of power generation control of an isolated grid system. Background technique [0002] It is the primary task of the power sector to continuously and stably provide users with electric energy whose quality (frequency, voltage, etc.) indicators meet national standards, so as to meet the needs of national economic construction and people's production and life. The power grid transports electric energy from power producers to power consumers. The stability and accuracy of grid power supply frequency and voltage are important indicators of power supply quality. When the total production and consumption of electric energy in the grid are out of balance, the power supply frequency will increase or decrease. As long as we try to control the total production and consumption of electr...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method and system for stabilizing the system frequency and voltage during a large load step of the isolated grid system, which can make the isolated grid system Output current with stable fr

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