RESEARCH ON FREQUENCY SUPPORT OF OFFSHORE WIND POWER VSC-MTDC GRID CONNECTED SYSTEM

Chen Helin; Zheng Xiaoyun

doi:10.19912/j.0254-0096.tynxb.2020-0593

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (3) : 356-365. DOI: 10.19912/j.0254-0096.tynxb.2020-0593

RESEARCH ON FREQUENCY SUPPORT OF OFFSHORE WIND POWER VSC-MTDC GRID CONNECTED SYSTEM

Chen Helin, Zheng Xiaoyun

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Abstract

This paper focused on the offshore wind power voltage sourced converter based multi-terminal high voltage direct current transmission （VSC-MTDC） grid connected system. The frequency modulation function of wind power VSC-MTDC for onshore power grid was mainly studied. Detailed wind farm, converter station and power grid model were established. A dynamic frequency modulation method for VSC-MTDC grid connected offshore wind power system, named improved slope control was proposed. The whole offshore wind farm VSC-MTDC was added with the improved slope control. Active power among several shore converter stations could be reasonable distributed. Active power balance of corresponding onshore power grid could be ensured. Frequency modulation of VSC-MTDC for onshore power grid was realized. Frequency stability of power grid was improved. At the same time, the quantitative index of wind power VSC-MTDC for power grid frequency modulation was given. Participating frequency modulation contribution index and participating frequency modulation capability index respectively reflected the energy and instantaneous frequency modulation capability of VSC-MTDC participating in power grid frequency modulation. Based on PSCAD / EMTDC simulation platform, a simulation model of four terminal offshore wind power VSC-MTDC grid connected system was built. The dynamic simulation was conducted. When one of the onshore power grid load changes and frequency offsets, corresponding frequency modulation control of wind power VSC-MTDC system was activated. Simulation results showed that the proposed control method could help the frequency stability and transient stability of power grid.

Key words

offshore wind farms / voltage sourced converter based multi-terminal high voltage direct current transmission（VSC-MTDC） / improved slope control / dynamic frequency scaling / transient stability

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Chen Helin, Zheng Xiaoyun. RESEARCH ON FREQUENCY SUPPORT OF OFFSHORE WIND POWER VSC-MTDC GRID CONNECTED SYSTEM[J]. Acta Energiae Solaris Sinica. 2022, 43(3): 356-365 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0593

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