摘要
由于大型并网风电场有功功率与无功功率的波动导致风电场并网母线及受端弱电网系统的电压和频率不稳定,提出用电压源换流器高压直流输电(VSC-HVDC)的电压与频率控制模型控制风电场并网母线的电压和频率。建立风电场经VSC-HVDC并入大电网的电力系统数学模型,详细设计VSC-HVDC的变流器WFVSC(风电场侧变流器)和GSVSC(电网侧变流器)控制环节,在电压和功率外环及电流内环双环控制的基础上,加入频率控制,以解决电网频率发生改变时,双馈变速风机无法对电网提供频率响应的问题。建立相同条件下高压交流(HVAC)并网的模型进行比较,仿真分析风电场风速波动和风电场出口端三相短路故障两种情况下的并网点(PCC)电压与频率变化,仿真结果验证了该控制模型的正确性和有效性。
The reactive and active power variation of grid-connected wind farms leads to voltage and frequency fluctuations and instability of power grid. The voltage and frequency control model of Voltage Source Converter HVDC （VSC-HVDC） was proposed to overcome this problem. The mathematical model of wind farm integration system was systematically built. The control link of VSC-HVDC converter WFVSC and GSVSC was well designed. The frequency link was also added to the traditional control model of voltage and power outer loop control and current inner loop control to solve the problem that double fed variable speed wind turbine could not response to frequency variation when the grid frequency changed. The test system of wind farm integration by VSC-HVDC to grid was established, the corresponding HVAC integration was applied for comparison, and wind speed fluctuations and fault were simulated. The simulation results verify that the proposed control model of VSC-HVDC is correct and valid based on test system.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2014年第8期1355-1362,共8页
Acta Energiae Solaris Sinica
基金
国家高技术研究发展(863)计划(2012AA051707)
上海市教委科研创新项目(12ZZ172)
上海绿色能源并网工程技术研究中心(13DZ2251900)
