A method of voltage stability control based on avc

Abstract

The invention relates to a voltage stability control method based on AVC (Automatic Voltage Control). The voltage stability control method comprises the following steps: 1) collecting the current bus voltage data in real time by an AVC substation center control unit, and sending the data to an AVC substation monitoring unit; 2) comparing the received current bus voltage data with a target value by the AVC substation monitoring unit, and performing the 3) step when the detected current bus voltage is higher than the maximum target value and the error is greater than a set threshold value, or performing the 4) step when the detected current bus voltage is lower than the minimum target value and the error is greater than the set threshold value; 3) sending a demagnetizing command to the AVC substation center control unit by the AVC substation monitoring unit, and controlling an AVC substation execution unit to perform demagnetizing action by the AVC substation center control unit; 4) sending a magnetizing command to the AVC substation center control unit by the AVC substation monitoring unit, and controlling the AVC substation execution unit to perform magnetizing action by the AVC substation center control unit. Compared with the prior art, the voltage stability control method has the advantages that the adjustment of voltage can be high in precision, high in speed, stable to change and the like.

Description

technical field [0001] The invention relates to a voltage stability control method, in particular to an AVC-based voltage stability control method. Background technique [0002] Voltage is an important indicator of power quality. Voltage quality has an important impact on the safe and economical operation of the power system, on ensuring the safe production of users and product quality, as well as the safety and life of electrical equipment. Reactive power compensation and reactive power balance are the basic conditions to ensure voltage quality. [0003] According to the statistics of 96 500kV plant and station voltage monitoring points in the East China Grid, the qualification rate of the main grid voltage in 2008 was 100%, which was the same as that in 2007. In order to complete the voltage qualification rate target, East China Network Commissioning, in view of the main contradiction of reactive power and voltage operation, vigorously started to strengthen related work, ...

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Problems solved by technology

The annual voltage fluctuation amplitude of Tianhuangping Power Plant, Hemu Station, and Nanyan Station exceeds 25kV. These areas lack reactive power regulation capabilities, voltage control methods are still insufficient, and the ability to cope with changes in power grid operation mode is poor

[0005] In terms of reactive power and voltage control, there are still some uncoordinated and unreasonable problems. For example, the reactive power exchange between power grids in some areas and between 500kV and 220kV of some main transformers is still too large, and the reactive power control strategy between plants and stations lacks unity. coordination

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