Reactive power optimization configuration method and device for offshore wind plant

Abstract

The invention discloses an offshore wind power plant reactive power optimization configuration method and device, and the method comprises the steps: determining a first reactive power vacancy curved surface and a second reactive power vacancy curved surface through employing the reactive power vacancy of a wind power plant according to a preset equivalent calculation model, and obtaining a first capacitive reactive power compensation amount and a first inductive reactive power compensation amount; the reactive power vacancy of a wind power plant under the no-load and full-load conditions of a wind turbine generator is calculated, the capacity of a high-voltage shunt reactor is determined, and after the capacity of the high-voltage shunt reactor is grouped with harmonic resonance as a constraint condition, a dynamic compensation device is combined with a target function constructed by adopting the sum of the annual investment cost value and the annual active power loss, so that the reactive power vacancy of the wind turbine generator is calculated. And the compensation capacity of the dynamic reactive power compensation device is optimally calculated by taking the static voltage stability margin, the first capacitive reactive power compensation amount, the first inductive reactive power compensation amount and the voltage deviation as constraint conditions. The comprehensive cost is reduced; and the safety of reactive configuration is improved.

Description

technical field [0001] The present invention relates to the technical field of reactive power compensation of wind farms in electric power systems, in particular to a reactive power optimization configuration method and device for offshore wind farms. Background technique [0002] At present, offshore wind farms mostly use high-voltage AC submarine cables to collect wind power, and after boosting the voltage, transport it to the onshore centralized control station for long distances. Since the capacitance of the submarine cable is much higher than that of the overhead line, its capacity rise effect is likely to cause power frequency overvoltage. At the same time, harmonic resonance problems caused by wind turbine converters, reactive power compensation devices and other power electronic devices and line capacitance will also seriously affect the power quality of the grid. Therefore, overvoltage and harmonic resonance problems should be fully considered in the process of rea...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a reactive power optimization configuration method and device for offshore wind farms, in order to solve the problem that the voltage stability of wind farms cannot be guaranteed in the prior art, reduce the overall cost as the goal, and take voltage stability and resonance as constraints to optimize offshore wind farms. Wind farm reactive power configuration, improving the safety of reactive power configuration

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