AC/DC hybrid system power coordination control method for suppressing DC continuous commutation failure

Abstract

The invention discloses an AC/DC hybrid system power coordination control method for suppressing DC continuous commutation failure, which comprises the following steps: when the system faces the risk of continuous commutation failure, reducing the active power of a DC transmission system by adjusting an inverter side DC current instruction, thereby suppressing the DC continuous commutation failure; meanwhile, monitoring the power flow change of the alternating-current and direct-current hybrid system, and performing overload risk judgment on the alternating-current transmission system; and if the overload risk exists, starting a thermal power generating unit frequency modulation system to reduce active power output, and if the thermal power plant adjustment level cannot effectively reduce large-range fluctuation of system power flow, adopting a wind turbine generator active power control method to adjust active power output of a sending-end power grid, and reducing overload harm of an alternating current transmission system. According to the method, the direct-current continuous commutation failure can be inhibited, the overload phenomenon risk of the alternating-current transmission system can be reduced, and the flexibility, rapidity and economical efficiency of power coordination control of the alternating-current and direct-current series-parallel system containing the high-proportion wind power sending end power grid are effectively guaranteed.

Description

technical field [0001] The invention relates to a power coordination control method of an AC / DC hybrid system for suppressing DC continuous commutation failure, and belongs to the technical field of large power grid stability control. Background technique [0002] The construction of my country's wind power bases and thermal power bases is highly overlapping in distribution areas, and they are far away from the load center. Therefore, the power generation method of wind-fired bundling is widely used, and the high-voltage direct current transmission system is in line with the large-capacity, long-distance wind-fired power generation process in the wind-fired bundling power generation process. transmission needs. Combined with the traditional high-voltage AC transmission system, the wind-fired bundled AC-DC hybrid external transmission system will be an important development trend of the power system. Commutation failure on the inverter side of HVDC transmission system is one ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of insufficient power coordination control of the wind-fire bundled AC-DC hybrid transmission system in the prior art when the DC continuous commutation fails, the present invention proposes a power coordinated control of the AC-DC hybrid system to suppress the DC continuous commutation failure method, analyze the power flow distribution characteristics of the wind-fired bundled AC-DC hybrid external transmission system, suppress the DC continuous commutation failure by reducing the reactive power demand of the DC transmission system, and actively control the active power output of the wind turbines at the sending end grid to reduce the AC transmission system. Overload phenomenon hazards, in order to achieve system power coordination optimization control

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