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考虑锁相环影响的直流下垂控制电动汽车系统并网动态特性分析
修连成1, 杜志叶1, 李明贤2, 何靖萱1, 宋汉梁3, 王东杰4
1.武汉大学 电气与自动化学院,湖北 武汉 430072;2.国网浙江省电力有限公司桐乡市供电公司,浙江 桐乡 314500;3.国网山东省电力公司滨州供电公司,山东 滨州 256600;4.国网江苏省电力有限公司超高压分公司,江苏 南京 211102
摘要:
随着新能源在电网中的渗透率不断增加,传统电力系统的惯性效应、阻尼水平以及同步能力都发生了改变,致使电网稳定运行能力下降。为此,基于静止同步发电机模型,建立了考虑锁相环影响的直流下垂控制两级式电动汽车(EV)系统的并网模型,揭示了EV系统惯性、阻尼以及同步特性的影响因素和影响规律,使得EV系统具备辅助电网稳定运行的能力。研究结果表明,变流器控制策略、锁相环、电路结构以及系统的稳态工作点共同决定了系统的动态特性。当EV系统使用直流下垂控制策略时,通过改变频率控制环、功率控制环、恒压控制环和锁相环参数,可等效调节系统的惯性效应、阻尼水平以及同步能力。同时,在强电网中调节锁相环参数对电网侧发生扰动时的动态特性具有改善作用,但对EV侧振荡的改善作用较小。所得结论可以辅助提升电力系统的安全运行能力,实现EV系统与电网的友好互动。
关键词:  电动汽车  直流下垂控制  锁相环  动态特性  静止同步发电机模型
DOI:10.16081/j.epae.202202003
分类号:U469.72;TM761
基金项目:国家自然科学基金资助项目(51977152)
Dynamic characteristic analysis of DC drop control-based grid-connected electric vehicle system considering influence of phase locked loop
XIU Liancheng1, DU Zhiye1, LI Mingxian2, HE Jingxuan1, SONG Hanliang3, WANG Dongjie4
1.School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China;2.Tongxiang Power Supply Company of State Grid Zhejiang Electric Power Co.,Ltd.,Tongxiang 314500, China;3.Binzhou Power Supply Company of State Grid Shandong Electric Power Company, Binzhou 256600, China;4.State Grid Jiangsu EHV Company, Nanjing 211102, China
Abstract:
With the increasing penetration rate of new energy in the power grid, the inertia effect, damping level and synchronization capability of the traditional power system have changed, resulting in the decline of power grid’s stable operation capability. Therefore, based on the model of static synchronous generator, the grid-connected model of DC droop control-based two-stage EV(Electric Vehicle) system considering the influence of PLL(Phase Locked Loop) is established, and the influencing factors and laws of EV system’s inertia, damping and synchronization characteristics are revealed, which makes the EV system capable of assisting the stable operation of power grid. The research results show that the system’s dynamic characteris-tics are determined by the control strategy of converter, PLL, circuit structure and steady-state operation point of the system. When DC droop control strategy is used in EV system, the inertia effect, damping level and synchronization capability of the system can be effectively adjusted by changing the parameters of frequency control loop, power control loop, constant voltage control loop and PLL. At the same time, adjusting PLL parameters in strong power grid can improve the dynamic characteristics when disturbance occurs at power grid side, but the improvement effect on the oscillation at EV side is small. The conclusion can help improve the safe operation ability of power system and realize the friendly interaction between EV system and power grid.
Key words:  electric vehicles  DC droop control  phase locked loops  dynamic characteristics  model of static synchronous generator

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