• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2019, Vol. 40 ›› Issue (2): 100-.doi: 10.3969/j.issn.1000-7229.2019.02.013

• 智能电网 • 上一篇    下一篇

 基于VSG技术的VSC-HVDC输电系统受端换流器控制策略

 刘中原1,王维庆1,王海云1,袁成玉1,王亮1,李永钦1,丁文彬2

 
  

  1.  1. 新疆大学电气工程学院可再生能源发电与并网技术教育部工程研究中心,乌鲁木齐市 830047;
    2. 国网乌鲁木齐西郊供电公司,乌鲁木齐市 830047
  • 出版日期:2019-02-01
  • 作者简介:刘中原(1993),男,硕士研究生,主要研究方向为柔性输电技术、新能源发电与并网技术; 王维庆(1959),男,教授,博士研究生导师,主要研究方向为电力系统自动化和风电机组智能控制; 王海云(1973),女,教授,硕士研究生导师,主要研究方向为可再生能源发电与并网技术; 袁成玉(1993),男,硕士研究生,主要研究方向为新能源发电及直流并网技术; 王亮(1993),男,硕士研究生,主要研究方向为混合直流输电技术; 李永钦(1994),男,硕士研究生,主要研究方向为电机转矩控制技术; 丁文彬(1992),男,助理工程师,主要从事电网供配电运行方面的工作。
  • 基金资助:
    国家自然科学基金项目(51667020);新疆维吾尔自治区重点实验室项目(2016D3021)
     

 VSC-HVDC Inverter Control Strategy Based on VSG Technology
 

 LIU Zhongyuan1, WANG Weiqing1, WANG Haiyun1, YUAN Chengyu1, WANG Liang1, LI Yongqin1, DING Wenbin2

 
  

  1.  1. Engineering Research Center of Ministry of Education for Renewable Energy Power Generation & Grid Technology,School of Electrical Engineering, Xinjiang University,Urumqi 830047,China;
    2. State Grid Urumqi Western Suburb Power Supply Company,Urumqi 830047,China
  • Online:2019-02-01
  • Supported by:
     This work is supported by National Natural Science Foundation of China (No.51667020) and Xinjiang Uygur Autonomous Region Key Laboratory Project(No.2016D3021)
     

摘要:  针对传统换流器控制策略下柔性直流(voltage source converter based HVDC,VSC-HVDC)输电系统难以有效参与交流系统频率的动态调节以及交直流系统间功率传输不平衡等问题,在对虚拟同步发电机(virtual synchronous generator,VSG)运行机制特性进行研究的基础上,提出了一种基于VSG技术的VSC-HVDC输电系统受端换流器控制策略。首先,基于VSC-HVDC输电系统拓扑模型,分析了换流站虚拟同步化的可行性;其次,将具有有功模糊PI下垂控制的VSG技术引入到高压直流输电系统,通过调整下垂系数,使柔性直流输电系统逆变器在稳态运行及暂态故障下可以保障系统有功功率平衡传输,使其具有协调控制交流系统频率和直流系统电压的能力;最后,在Matlab/Simulink中构建了一个三端系统用于仿真验证。结果表明:VSC-HVDC输电系统在采用VSG控制策略后,可以改善交流电网的惯性水平,使频率变化得到衰减,其调压控制功能也能在稳态和暂态下提供较好的功率支撑作用,有效提高了交直流系统的稳定性和可靠性。

 

关键词:  , 柔性直流输电, 虚拟同步机, 受端换流器, 调频特性, 直流电压协调控制

Abstract:  With the traditional converter control strategies, the dynamic frequency regulation of the AC power system and the unbalanced power transmission between the AC and DC systems are hard to be involved in voltage source converter based high voltage direct current(VSC-HVDC)system. Aiming at the problem, on the basis of the research on the characteristics of the virtual synchronous generator (VSG) technology, a VSC-HVDC inverter control strategy based on VSG technology is proposed. Firstly, according to the VSC-HVDC system topology model, the feasibility of virtual synchronization of converter station is analyzed. Secondly, the VSG technology with fuzzy PI droop control for active power is introduced into the HVDC transmission system. By adjusting the droop coefficient, the inverter of the flexible HVDC transmission system can ensure the active power transmission balance when the system under steady-state operation and transient faults, so that it has the ability to coordinate control the AC system frequency and the DC system voltage. Finally, a model of three-terminal system is built in Matlab/Simulink for simulation verification. The results show that the VSC-HVDC system can improve the inertial of the AC grid and reduce the change rate of frequency after adopting the VSG control strategy. The FM control can provide better support in the steady state and transient state, which improved the performance of AC and DC system effectively, as well as the reliability of the system. 

This work is supported by National Natural Science Foundation of China (No.51667020) and Xinjiang Uygur Autonomous Region Key Laboratory Project(No.2016D3021)
 

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