Isolated power grid multi-unit parallel load distribution control system

Abstract

The invention discloses an isolated power grid multi-unit parallel load distribution control system comprising a load distribution system and DEH (Digital Electro-Hydraulic) systems. A controller of each of the DEH systems is embedded with a DEH specific control program; state signals and parameters during the running of a steam turbine, and the state signals, running parameters and signaling modes of a DCS (Distributed Control System) system, an electrical system and a boiler FSSS (Furnace Safety Supervision System) are all received by a load distribution system, are judged and processed by a load distribution program and then control signals are sent to each DEH system, and the unit load is distributed by the embedded DEH control logic. The isolated power grid multi-unit parallel load distribution control system realizes the distribution and transfer of loads of an isolated power grid parallel multiunit, displays the running states of each unit, selects the appropriate running mode according to the running parameters of the units, and freely sets the load distribution proportions, thereby realizing the frequency control mode or load control mode of and the load planned scheduling of connected units and guaranteeing the simultaneous safe and reliable running of each steam turbine.

Description

technical field [0001] The present invention relates to a load distribution control system of a steam turbine unit. To be precise, it relates to a multi-unit parallel load distribution control system for an isolated power grid, which ensures the safe operation of multiple generator units in the isolated grid condition and realizes a reasonable load between the generator units. Assignment scheduling. Background technique [0002] In the field of existing technologies, many technologies related to the parallel operation of multiple units in an isolated power grid have been provided, such as: "Discussion on the Operation of Isolated Grids" (published in "Xinjiang Electric Power Technology" 2008 No. 3 Issue No. 98), " Handling Strategies for Various Abnormal Situations in Thermal Power Plants with Isolated Grid Operation" (published in "Guizhou Electric Power Technology" No. 8, 2008), "Deh System Isolated Grid Operation Control Technology Solution" (published in "Heat Turbine" i...

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Problems solved by technology

[0002] In the field of existing technologies, many technologies related to the parallel operation of multiple units in an isolated power grid have been provided, such as: "Discussion on the Operation of Isolated Grids" (published in "Xinjiang Electric Power Technology" 2008 No. 3 Issue No. 98), " Handling Strategies for Various Abnormal Situations in Thermal Power Plants with Isolated Grid Operation" (published in "Guizhou Electric Power Technology" No. 8, 2008), "Deh System Isolated Grid Operation Control Technology Solution" (published in "Heat Turbine" in March 2009 Volume 38, No. 1), "300MW Thermal Power Unit Isolated Grid Stable Operation Control Technology" (published in "Guangxi Electric Power" No. 1, 2009), the regulation system in the above materials has many advantages, but there are also aspects that need to be improved , especially when multiple generating units are running simultaneously in an isolated power grid, because there is no relevant control system to coordinate the working mode of each generating set and the distribution of load; When an organic unit starts and stops, it will also cause large speed fluctuations in the power grid, and the units will be involved in the adjustment of each other, and the load distribution and transfer between the generator units cannot be realized reasonably.

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