基于双馈感应风力发电机虚拟惯量和桨距角联合控制的风光柴微电网动态频率控制  

Dynamic Frequency Control Strategy of Wind/Photovoltaic/Diesel Microgrid Based on DFIG Virtual Inertia Control and Pitch Angle Control

作　　者：赵晶晶[1] 吕雪[1] 符杨[1] 胡晓光[1] 

机构地区：[1]上海电力学院电气工程学院,上海市杨浦区200090

出　　处：《中国电机工程学报》2015年第15期3815-3822,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51207087);上海市教委科研创新项目(12YZ143);上海绿色能源并网工程技术研究中心资助项目(13DZ2251900)~~

摘　　要：微电网孤岛模式下的频率稳定性是微电网安全稳定运行的重要保证。为提高微电网频率动态特性,通过在双馈感应风电机组(doubly fed induction generator,DFIG)中加入虚拟惯量控制环节,增加微电网惯性,释放转子中储存的部分动能为微电网频率提供动态支持;为解决虚拟惯性控制环节加入后转子转速恢复过程中DFIG的有功功率跌落问题,采用桨距角控制,在频率跌落时释放DFIG备用功率,从而弥补转速恢复过程的功率跌落,并减小电网的稳态频率偏差。结合DFIG虚拟惯量特性和桨距角控制,配合柴油机的一次调频功能,有效抑制了负荷变化引起的微电网频率波动。最后在DIg SILENT Power Factory仿真软件中建立含柴油发电机、光伏电池、DFIG的微电网控制模型,验证了所提策略的有效性。Frequency stability is an important guarantee for islanded microgrid, which can ensure it operate safe and steady. In order to improve microgrid dynamic frequency characteristic, this paper represented a virtual inertia control strategy of doubly fed induction generator （DFIG） to increase the amount of microgrid inertia via releasing part of the kinetic energy stored in the rotating rotor, so DFIG can provide a transient frequency support for microgrid. To compensate the decrease of output wind power during the recovery period of the rotor speed, this paper presented the pitch angle control strategy. As a result, the released reserve power caused by decrease of pitch angle can compensate the output power sag, and reduce steady state frequency deviation. This paper combined characteristic of virtual inertial control and pitch angle control of DFIG~ and coordinated primary frequency control of diesel generator, consequently islanded microgrid frequency fluctuations caused by load variation can be effectively restrained. Finally, this paper established the microgrid control model include the diesel generator, photovoltaic cell and DFIG, the simulation results showed that this control strategy is valid.

关 键 词：孤岛运行微电网 动态频率控制 双馈感应风力发电机 虚拟惯量控制 桨距角控制 

分 类 号：TM71[电气工程—电力系统及自动化]