A DC continuous commutation failure suppression method based on reactive power adaptive regulation of photovoltaic power station

Abstract

The present invention proposes a DC continuous commutation failure suppression method based on reactive power self-adaptive adjustment of a photovoltaic power station for an AC-DC interconnection system. This method calculates the reactive power output required by the photovoltaic power station by collecting the operating status data of the photovoltaic power station and the DC system after the commutation failure of the DC system, and uses this to perform adaptive adjustment of the control parameters of the photovoltaic power station to support the commutation failure of the DC system The dynamic reactive power demand in the recovery process can suppress the occurrence of continuous commutation failure of the system. The method of the present invention determines the reactive power output required by the photovoltaic power station by detecting the leading trigger angle of the DC system, and provides dynamic reactive power support for the system during the recovery process of the commutation failure of the DC system, thereby suppressing the occurrence of continuous commutation failure of the system, and effectively It helps to improve the safety and stability of the AC-DC interconnection system, and has good engineering application value.

Description

technical field [0001] The invention belongs to the field of electric power technology, and relates to the research field of direct current continuous commutation failure suppression strategy, in particular to a direct current continuous commutation failure suppression method based on reactive power adaptive adjustment of photovoltaic power plants. Background technique [0002] Because of its technical advantages that the transmission distance is not limited by the stability of synchronous operation, and the transmission power is flexibly and quickly adjusted, HVDC is widely used in long-distance large-capacity power transmission, large-area grid interconnection, and cross-strait power transmission. The implementation of the energy development strategy of "transmitting electricity from the west to the east, mutual aid between the north and the south, and national interconnection". While solving the problem of energy transmission, HVDC also introduces a series of problems, po...

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Problems solved by technology

[0003] DC commutation failure will cause loss of power transmission, and in the recovery process of DC commutation failure, the inverter station needs to absorb a large amount of reactive power from the AC system, resulting in further deterioration of the voltage of the converter station. If the system cannot provide sufficient reactive power support , the DC system will experience continuous commutation failures, and even lead to DC blocking in severe cases, seriously endangering the safe and stable operation of the power grid.

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