大型风光发电并网供电互补系统稳定性仿真

摘要

大规模新能源光伏电池与风机并网时,受光照强度、温度与风力的间歇性影响引起新能源输出功率的波动,以及在系统运行时的不确定因素,对系统稳定性产生影响.考虑光伏发电与风机发电功率的波动性、空间性以及系统运行的不确定因素,建立了风光发电并网系统的模型.以Power Factory/DIgSILENT为开发平台,建立大规模风光发电并网系统模型,在双馈风机转子侧控制中加入阻尼控制器,对大规模风光发电并网系统在3种不同运行方式下系统暂态电压稳定性进行了比较分析.结果表明,风光发电并网系统以风光混合发电方式运行时系统转子电流振荡程度低,有效减小了电压振荡,实现了故障情况下风光互补系统以及电网的安全稳定运行.%Due to these factors,such as light intensity,temperature and wind intermittent,the output power of new energy fluctuations,which can make impact on the stability of the system if large-scale new energy photovoltaic cells and fans are connected with grid.Considering these factors,we established the model of wind & solar complementary power generation.The model of large-scale wind & solar complementary power generation system was established based on power Factory/DIgSILENT simulation software.A damping controller was included in doubly fed wind turbine rotor side control.The effect on system transient voltage stability was analyzed under different operation modes.The simulation results show that the complementary power generation system in operation of wind solar hybrid power generation can reduce the rotor current oscillation,which can realize the complementary system and power grid operate safely and steadily.