海上风电多端柔性直流并网系统频率支持研究

陈鹤林; 郑晓云

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

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太阳能学报 ›› 2022, Vol. 43 ›› Issue (3) : 356-365. DOI: 10.19912/j.0254-0096.tynxb.2020-0593

海上风电多端柔性直流并网系统频率支持研究

陈鹤林, 郑晓云

作者信息 +

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

Chen Helin, Zheng Xiaoyun

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文章历史 +

摘要

针对海上风电多端柔性直流（VSC-MTDC）并网系统,重点研究风电VSC-MTDC对岸上电网调频功能。通过建立详细风电场、换流站和电网模型,提出一种适用于海上风电VSC-MTDC并网系统动态频率调节方法,即改进斜率控制。整个海上风电场VSC-MTDC加入改进斜率控制后,可使有功功率在若干岸上换流站之间合理分配,从而确保相应岸上电网有功功率平衡,实现VSC-MTDC对于岸上电网频率调节,提升电网频率稳定性。同时给出风电VSC-MTDC对于电网调频的量化指标,即参与调频贡献指数和参与调频能力指数,分别反映VSC-MTDC参与电网调频贡献的能量和瞬时调频能力。在PSCAD/EMTDC仿真平台下搭建一个四端海上风电VSC-MTDC并网系统的仿真模型,并进行动态仿真,其中一个岸上电网发生负荷变化、频率偏移时,风电VSC-MTDC系统实现电网调频控制,仿真结果验证所提并控制方法可为电网频率稳定提供帮助。

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.

导出引用

陈鹤林, 郑晓云. 海上风电多端柔性直流并网系统频率支持研究[J]. 太阳能学报. 2022, 43(3): 356-365 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0593

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

中图分类号： TM614

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