摘要
若虚拟同步机的振荡能量转移效率能够得到显著提升,风电机组抑制电网功率振荡将更具潜力。该文首先基于虚拟同步机模型,分析风电机组与同步发电机组间装配虚拟联轴器后的功角耦合关系,并建立含虚拟轴系的系统状态空间,利用根轨迹评估虚拟联轴器参数对系统稳定性的影响。其次,基于哈密顿原理,对比分析虚拟同步机及引入虚拟联轴刚度后,风电机组的振荡能量传递过程,获得风机与同步机之间能量完全传递的必要条件,并提出适于双馈风电机组的虚拟联轴控制策略。最后,通过含风电的两区互联系统验证风电机组经所提虚拟联轴器并入系统后,可以更高效的转移振荡能量,显著提升其阻尼功率振荡的能力。
If the oscillating energy transfer efficiency of virtual synchronous generators can be significantly improved,wind power generators will have more potential to suppress grid power oscillations. Based on the virtual synchronous generators model, this paper first analyzed the power-angle coupling relationship between wind generators and synchronous generator sets after the virtual assembly of the coupling. Then, the state space with a virtual shafting system was established, and the root locus was used to evaluate virtual coupling parameters for system stability. Secondly, based on the Hamilton principle, this paper analyzed the oscillating energy transfer process of virtual synchronous generators and the case which introduces virtual shaft coupling stiffness. The necessary conditions for complete energy transfer between wind generators and synchronous generators were obtained. In this way, a virtual coupling control strategy was proposed for wind turbines. Finally, through the two-area interconnection system containing wind power, it can be verified that after the wind turbine is incorporated into the system with the proposed virtual coupling, the oscillation energy could be transferred more efficiently, and its ability to dampen power oscillation could be significantly improved.
作者
刘华志
张祥宇
李永刚
付媛
覃露
LIU Huazhi;ZHANG Xiangyu;LI Yonggang;FU Yuan;QIN Lu(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Baoding 071003,Hebei Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第19期7007-7018,共12页
Proceedings of the CSEE
基金
河北省自然科学基金项目(E2018502108)
中央高校基本科研业务费专项(2020MS087)。
关键词
风力发电机
虚拟联轴
振荡能量
虚拟同步机
wind power generator
virtual shaft coupling
oscillation energy
virtual synchronous generator
作者简介
刘华志(1995),男,博士研究生,研究方向为新能源并网稳定性分析及控制,lhzncepu2018@outlook.com;通信作者:张祥宇(1984),男,博士,副教授,研究方向为风力发电控制技术、电力电子在电力系统中的应用,zh.xy.sq@163.com;李永刚(1967),男,教授,研究方向为大型电机故障诊断、新能源电力系统控制;付媛(1982),女,博士,副教授,研究方向为风力发电控制技术。
