摘要
研究了连接海上风电场的基于电压源换流器的VSC-HVDC系统。多电平逆变器应用于VSC-HVDC系统提高系统传输容量并改善电能质量问题。利用基于功率控制的方法对VSC-HVDC系统进行了仿真,实现了双侧的独立控制,风电场侧由风机带换流器组成,采用基于滞环比较的功率控制,而系统侧三电平换流器采用基于直接功率控制,三个滞环控制器分别控制有功功率、无功功率和中点电压。仿真结果证实了基于此算法的VSC-HVDC系统连接大型海上风电场,可以正常稳定地运行。系统侧三电平换流器降低谐波含量并提高功率因数。
VSC-HVDC system based on voltage source converter connecting large-scale offshore wind farm is illustrated.To improve the transmission capacity and solve power quality problem,multilevel inverter is used in VS C-HVDC system.The simulation system is built on the basis of power control algorithm,implementing the independent control on b i-lateral sides.On wind turbine side,there are wind generators with respective converte r,adopting the power control method based o n hysteresis comparison and the three-level converter on system side adopting multi-level direct power control,achieved by three hysteresis control devices for active power,reactive power and midpoint voltag e.The results on the simulation prove that under large transmission capacity,VS C-HVDC system connecting large-scale offshore wind farm and power system can operate under a normal and stable situation.Owing to the thre e-level inverter on system side,the power quality is better such as low harmonics and hi gh power factor.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第14期98-103,152,共7页
Power System Protection and Control
