基于混合储能的双馈风机的电网支撑能力提升策略  

Power grid support capability improvement strategy of doubly-fed wind power generator based on hybrid energy storage system

作　　者：刘刚[1] 袁至[1] 王维庆[1] 何山[1] Liu Gang;Yuan Zhi;Wang Weiqing;He Shan(Engineering Research Center of Renew able Energy Generation and Grid-Connected Control,Ministry of Education,Xinjiang University,Urumqi 830047,China)

机构地区：[1]新疆大学可再生能源发电与并网控制教育部工程研究中心,新疆乌鲁木齐830047

出　　处：《可再生能源》2022年第10期1387-1395,共9页Renewable Energy Resources

基　　金：国家自然科学基金(52067020,51767024);新疆维吾尔自治区重点实验室开放课题(2018D04005);新疆维吾尔自治区高校科研计划项目(XJEDU2021I010)。

摘　　要：电网电压跌落时风电机组须具备低电压穿越能力,但是低电压穿越会造成系统频率不稳定。当传统储能结合双馈风机为系统提供惯量支撑和参与系统的一次调频时,仅以频率作为参考量,因此低电压穿越会加剧直流母线电压升高。文章提出了基于混合储能的双馈风机电网支撑能力提升策略。在直流母线处,加入超级电容与蓄电池组成的混合储能模块,在系统功率波动时,混合储能模块为系统提供惯性支撑和参与系统的一次调频;在电压跌落时,混合储能模块吸收直流母线上多余的能量,维持直流母线电压稳定。文章通过仿真试验验证了所提方法的有效性。When the grid voltage drops,the doubly-fed wind power generator is required to have low voltage ride through capability,but low voltage ride through will cause the system frequency to be unstable.Traditional energy storage combined with doubly-fed wind power generator provide inertia support for the system and only use frequency as a reference when participating in the primary frequency control of the system.Therefore,the unstable system frequency caused by low voltage ride through will aggravate the increase of DC bus voltage.Based on this,a strategy to improve the grid support capacity of doubly-fed wind power generator based on hybrid energy storage system is proposed.Add a hybrid energy storage module composed of super capacitors and batteries to the DC bus.When the system power fluctuates,the hybrid energy storage module provides inertial support for the system and participates in the primary frequency control of the system;when the voltage drops,the hybrid energy storage module absorbs the DC bus The excess energy on the DC bus maintains the stability of the DC bus voltage.Finally,simulation experiments verify the effectiveness of the method proposed in this paper.

关 键 词：双馈风力发电机 惯量支撑 一次调频 混合储能 低电压穿越 

分 类 号：TK51[动力工程及工程热物理—热能工程]