AVC control method and system based on coordinated control of phase modifier and capacitor bank, and medium

Abstract

The invention discloses an AVC control method and system based on coordinated control of a phase modifier and a capacitor bank, and a medium. The method comprises the following steps: if a control instruction is within a first specified threshold range, when a set of standby capacitors is brought into AVC coordinated control, the standby capacitors are switched off, and reactive power output is conducted on the control instruction through a phase modifier after power distribution; if the value of the control instruction is within a second specified threshold range, whether there is a set of standby capacitors brought into AVC coordinated control or not is detected; if there is no set of standby capacitors brought into AVC coordinated control, short-time reactive power output is conducted on the control instruction through the phase modifier after power distribution, a set of standby capacitors is switched in, and reactive power reserve of the phase modifier is released; and if there isa set of standby capacitors brought into AVC coordinated control, average output is performed by the phase modifier after the capacitor capacity is subtracted from the control instruction. Under thecondition that the change in available dynamic reactive power reserve of the phase modifier is small, the range of the control instruction can be increased and widened without greatly affecting the reactive group switching instruction of an original DC control and protection system. The method has the advantages of being good in compatibility and convenient for technical upgrade and reconstruction.

Description

technical field [0001] The invention relates to power system operation and control, in particular to an AVC control method, system and medium based on coordinated control of a condenser and a capacitor bank. Background technique [0002] With the rapid development of UHV DC in my country, the large-scale development of clean energy, and the concentration of a large proportion of power-receiving areas, the characteristics of the power grid have undergone major changes, and the problems of dynamic reactive power reserve decline and insufficient voltage support in some areas have become more prominent. The voltage stability problem has become one of the main problems of the safety and stability of the large power grid. In order to improve the dynamic reactive power compensation capability of the power grid and increase the dynamic reactive power reserve level of the regional power grid, it is usually considered to install a dynamic reactive power compensation device to improve t...

AI Technical Summary

Problems solved by technology

Taking Shaoshan Converter Station as an example, under the current control mode of each SC configured in the station, the steady-state reactive power output of a single unit is within ±50MVar, that is, the current control command Q AVC The adjustment range is within ±100MVar, which is relatively narrow

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