文章摘要
袁志昌,吴志力,金强,等.含直流电压二次调节的VSC-MTDC互联系统频率稳定控制[J].电力系统自动化,2018,42(23):9-13. DOI: 10.7500/AEPS20180312007.
YUAN Zhichang,WU Zhili,JIN Qiang, et al.Frequency Stabilization Control Strategy with DC Voltage Secondary Regulation of VSC-MTDC Based Interconnected Systems[J].Automation of Electric Power Systems,2018,42(23):9-13. DOI: 10.7500/AEPS20180312007.
含直流电压二次调节的VSC-MTDC互联系统频率稳定控制
Frequency Stabilization Control Strategy with DC Voltage Secondary Regulation of VSC-MTDC Based Interconnected Systems
DOI:10.7500/AEPS20180312007
关键词: 柔性直流输电  附加频率控制  主从控制  下垂控制  直流电压二次调节
KeyWords: voltage source converter based multi-terminal DC(VSC-HVDC)  auxiliary frequency control  master-slave control  droop control  DC voltage secondary regulation
上网日期:2018-07-03
基金项目:国家电网公司科技项目(SGAH0000KJJS201600091)
作者单位E-mail
袁志昌 清华大学电机工程与应用电子技术系, 北京市 100084 yuanzc@tsinghua.edu.cn 
吴志力 国网北京经济技术研究院有限公司, 北京市 102209  
金强 国网北京经济技术研究院有限公司, 北京市 102209  
姜世公 国网北京经济技术研究院有限公司, 北京市 102209  
黄寅 国网安徽省电力有限公司, 安徽省合肥市 230061  
摘要:
      多端柔性直流输电(VSC-MTDC)可用于在多个异步互联的交流电网之间提供灵活受控的功率支援。实现上述功能的众多方法中,在下垂控制的基础上附加频率调节是一种典型的方法,由于其不依赖于站间通信,在灵活性和可靠性上均有突出的优势。然而,这种方法存在直流电压偏离额定值、严重时可能影响多端直流(MTDC)系统正常运行的不足。提出一种含直流电压二次调节的频率稳定控制策略,可以在保证频率调节效果的基础上,缓慢调整直流电压直至恢复额定值,提高了MTDC系统运行的稳定性。通过一个三端柔性直流系统的仿真验证了所提方法的有效性。
Abstract:
      Voltage source converter based multi-terminal DC(VSC-MTDC)can provide flexible frequency support control for asynchronous interconnected AC systems. Among many methods, droop control with frequency regulator is a typical method, which works without communication between voltage source converter(VSC)stations and has advantages in flexibility and reliability. While DC-voltage deviating from nominal voltage is a drawback of droop control with frequency regulator. A frequency control method of multi-terminal DC(MTDC)with DC voltage secondary regulator is proposed, which can recover DC-voltage slowly after frequency regulation settled down without loss of frequency regulation performance, improving the operation stability of MTDC system. The method is verified through digital simulation based on a three-terminals VSC-MTDC system.
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