Bipolar MMC convertor station control system for offshore wind power grid and control method of bipolar MMC convertor station control system

Abstract

The invention provides a bipolar MMC convertor station control system for an offshore wind power grid and a control method of the bipolar MMC convertor station control system. The system comprises anonshore bipolar MMC convertor station connected to an onshore alternating current system and an offshore bipolar MMC convertor station connected to an offshore wind plant, wherein the onshore bipolarMMC convertor station is connected to the offshore bipolar MMC convertor station; the onshore bipolar MMC converter station comprises positive and negative MMC converters which are respectively connected to the onshore alternating current system and are controlled by constant direct current voltage and constant reactive power; and the offshore bipolar MMC converter station comprises positive and negative MMC converters which are respectively connected to the offshore wind plant, and adopts a master-slave control strategy with power balancing capacity. The system and the method have the advantages that a stable synchronous alternating current power supply can be provided for the offshore wind plant, and the mutual influence between the positive and negative bipolar MMC converters is avoided.

Description

technical field [0001] The invention relates to the technical field of power system transmission and distribution, in particular to a bipolar MMC converter station control system and control method for offshore wind power grid-connected. Background technique [0002] In recent years, in order to reduce the consumption of fossil resources and prevent and control ecological and environmental pollution, my country has vigorously supported the development of new energy power generation industries, such as photovoltaic power generation and wind power generation. At present, the proportion of wind power generation in my country's total installed power capacity has exceeded 7%, becoming the third largest source of power after thermal power and hydropower. Among them, offshore wind energy resources are high-quality and abundant, and are far away from the living and operating areas of residents, so they have little impact on the environment, so they have attracted the attention of ma...

AI Technical Summary

Problems solved by technology

However, when using a true bipolar structure, if both the positive and negative inverters adopt the control mode of constant voltage frequency and voltage amplitude, the output voltages of the two inverters will affect each other, causing oscillation, which is not conducive to system stability

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