Renewable energy power system voltage stability control method considering grid-related protection

Abstract

The invention relates to a renewable energy power system voltage stability control method considering grid-related protection. High / low voltage grid-related protection of a renewable energy power system and high / low voltage switching reactive power source equipment constant values of a third defense line are set on a voltage stability control device of a renewable energy power generation system booster station. On the basis of a traditional power system voltage stability control device, the reactive power capacity of an inverter cut off due to grid-related protection is considered, the situation that reactive power source equipment is excessively switched due to the fact that the inverter cut off due to grid-related protection is ignored when the renewable energy power system voltage stability control device acts at high / low voltage can be avoided, part of inverters are prevented from continuing to act due to high / low-voltage grid-connected protection caused by high voltage of a renewable energy power generation system due to excessive switching of reactive power source equipment, and voltage collapse of the renewable energy power system due to mismatching of the grid-connected protection and the third defense line is avoided, so that the power failure range and economic loss of the system can be reduced, and the operation stability and reliability of the power system are improved.

Description

technical field [0001] The invention relates to the technical field of power system safe operation control, in particular to a method for voltage stability control of a renewable energy power system considering network-related protection. Background technique [0002] The "Guidelines for the Safety and Stability of Power Systems" stipulates that the safety and stability standards for the ability of my country's power system to withstand large disturbances are divided into three levels: the first level standard maintains stable operation and the normal power supply of the power grid; the second level standard maintains stable operation, but some losses are allowed Load; third-level standard When the system cannot maintain stable operation, it is necessary to prevent the system from collapsing and minimize the loss of load. According to this standard, we set up three lines of defense to ensure the safe and stable operation of the power system in the event of various accidents: ...

AI Technical Summary

Problems solved by technology

[0004] At present, the traditional third line of defense voltage stability control device in the power system only considers removing the reactive power source equipment of the station, but does not consider the negative impact brought by the grid-related protection of the inverter to the power grid. Inverter, and because the network-related protection operates first, it may cause excessive switching of reactive power equipment or over-cutting inverters when high / low voltage operates, so that the application to renewable energy power systems will cause high voltage in the renewable energy power system. Some inverters continue to operate due to the high / low voltage grid-related protection, and the voltage of the renewable energy power system collapses due to the mismatch between the grid-related protection and the third line of defense, resulting in a large-scale blackout of the system

Therefore, if the traditional power system third line of defense voltage stability control device is installed in the step-up transformer of the renewable energy power system, it must be modified accordingly.

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