Large combined cycle set before-separation automatic idle work reducing method and control device

Abstract

The invention relates to a large combined cycle set before-separation automatic idle work reducing method and a control device. The method is characterized in that a distributed control system (DCS) is used for detecting the working state of a set, and by controlling exciting currents through an excitation system of the set, the fact that large combined cycle set before-separation idle work is reduced to a target value automatically is achieved. The structure is characterized in that the DCS, a detecting loop and a generator excitation controller AVR are included, the detecting loop is provided with a halt signal detecting end, a generator power utilization end voltage detecting end, an active power detecting end and an idle work detecting end, an output end of the detecting loop is connected with an input end of the DCS, an output end of the DCS is connected with a control input end of the generator excitation controller AVR, and an output end of the generator excitation controller AVR is connected with an input end of the excitation system of the generator set. The large combined cycle set before-separation automatic idle work reducing method and the control device have the advantages that voltage fluctuation caused by the fact that work conditions are changed suddenly, voltages at the generator end can jump because of separation, and a power grid gets rid of a large amount of idle work suddenly can be avoided.

Description

Technical field: [0001] The invention relates to a method and a control device for automatically reducing reactive power before disassembling a large combined cycle unit. It belongs to the field of power generation technology equipment. Background technique: [0002] In the field of power generation technology, in order to reduce the impact on the power grid and the generator set, when the generator set is normally shut down, it is generally required to reduce the active and reactive power to nearly zero and split, which can reduce the impact on the power grid and the generator set. At present, the control system of large-scale gas-steam combined cycle unit is often designed with gas turbine control as the main control, ignoring the control of motor reactive power. During the splitting process, the generators often carry high reactive power loads, resulting in sudden changes in power conditions at the moment of splitting, and the generator terminal voltage will suddenly rise. Th...

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Problems solved by technology

[0004] One of the purposes of the present invention is to provide a method for automatically reducing reactive power before decommissioning of large combined cycle units in order to solve the problems of sudden changes in power grid power status and violent voltage fluctuations when the current technology is shut down

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