受控电压/电流源型变流器混合多机暂态电压支撑策略  

Transient Voltage Support Strategy for Hybrid Multi-Converter of Controlled Voltage/Current Source Converter

作　　者：杨铭[1] 曹武[1] 赵剑锋[1] 朱凌志 王宝基 Yang Ming;Cao Wu;Zhao Jianfeng;Zhu Lingzhi;Wang Baoji(School of Electrical Engineering Southeast University,Nanjing 210096 China;China Electric Power Research Institute(Nanjing),Nanjing 210003 China;Sungrow Power Supply Co.Ltd,Hefei 230009 China)

机构地区：[1]东南大学电气工程学院,南京210096 [2]中国电力科学研究院有限公司(南京),南京210003 [3]阳光电源股份有限公司,合肥230009

出　　处：《电工技术学报》2023年第19期5207-5223,5240,共18页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2021YFB2400500)。

摘　　要：以新能源为主体的新型电力系统暂态电压问题极大地影响电网稳定运行及大规模新能源消纳,发掘新能源场站多机变流器的动态无功补偿能力是适应新型电力系统暂态电压控制需求的关键。因此该文提出受控电压/电流源型变流器混合多机暂态电压支撑策略,首先分析了暂态电压支撑需求和混合多机暂态电压主动支撑的关键因素;然后研究混合多机暂态电压支撑控制模式,将两变流器控制模式特性进行互补,重点对变流器暂态控制策略进行改进,提出柔性限幅结合暂态有功阻尼控制提高混合多机的动态无功补偿能力及可靠性,自适应补偿控制提高混合多机动态无功输出准确度,共同实现暂态电压的可靠支撑,并进一步分析了参数整定方法;最后通过全面的仿真和实验分析验证所提策略的有效性和实用性。The increasing proportion of renewable energy makes the power system have obvious power electronic characteristics.The converters used for renewable energy is more sensitive to system voltage due to its weak high-low voltage ride-through capability.Under the condition of large disturbance of transient voltage condition,the renewable energy converter is very easy to be locked and cut off.The stable operation of high voltage direct current transmission also highly depends on the transient voltage stability.Therefore,the transient voltage problem of new type power grid with high proportion of renewable energy is the key to the safe and stable operation of the system.Currently,the transient active support capability of the converter is not available due to synchronization problems and reactive power output ability under transient voltage conditions.To solve the problems existing in active support of renewable energy station,controlled voltage/current source converters are connected in parallel to form a hybrid multi-converter system.The controlled voltage source converter realizes power angle control through power control.The synchronization control is not affected by system transient voltage.Therefore,stable synchronization conditions are provided by controlled voltage source converters.The controlled current source converter can output fast and accurate reactive power support.Based on the analysis and summary of active transient voltage support requirements of renewable energy station,a hybrid multi-converter transient voltage support strategy of controlled voltage/current source converter is proposed to improve the transient voltage stability of renewable energy station and enable it to support transient voltage actively.Controlled voltage source converters are prone to lose voltage source characteristics and reduce reactive power output capabilities because of the large power fluctuations under transient conditions.The overcurrent degree of the converter is flexibly limited by virtual impedance to improve the ada

关 键 词：受控电压/电流源 混合多机 暂态电压 支撑策略 

分 类 号：TM464[电气工程—电器]