摘要
针对典型可控负荷电动汽车,提出一种基于虚拟同步机技术的充放电控制策略。采用两级式拓扑进行研究,前级AC/DC控制引入基于充放电模式的新型虚拟同步机技术,使电动汽车具备传统同步机相似的惯量、阻尼及频率、电压调节特性的同时,该控制中设置的充放电方式防止电池满充满放,提高使用寿命;将直流母线电压的双闭环控制应用于后级DC/DC控制,提高直流接口的电压稳定性。该控制的特点是虚拟同步机和充放电控制均由前级整流器实现,具有较好的协调性。在MATLAB/Simulink平台中通过典型算例证明,在不同初始电池状态、不同电网负荷和分布式电源接入情况下,所提控制策略使电动汽车不仅能向电网提供惯量、阻尼支撑,还可根据电网频率、电压变化情况自动调整有功、无功功率实现功率双向调节,满足用户需求的同时提高电网动态稳定性。
Aiming at a typical controllable load electric vehicle,a charge and discharge control strategy based on virtual synchronous machine technology is proposed in this paper.The two-stage topology is used for the research.The fore-stage AC/DC control introduces a novel virtual synchronous machine technology based on the charge and discharge mode,so that the electric vehicle has the similar inertia,damping,frequency and voltage regulation characteristics of the traditional synchronous machine.Meanwhile,the charging and discharging mode set in the control prevents the battery from being fully charged and discharged,which improves the service life.The double closed-loop control of the DC bus voltage is applied to the subsequent DC/DC control to improve the voltage stability of the DC interface.The characteristic of this control is that the virtual synchronous machine and the charge and discharge control are realized by the front-stage rectifier,which has good coordination.The typical examples in MATLAB/Simulink platform show that under different initial battery states,different power grid loads,and distributed generation access conditions,the proposed control strategy enables electric vehicles not only to provide inertia and damping to support the power grid,but also to automatically adjust the active and reactive power according to change frequency and voltage of the power grid to achieve bidirectional power regulation,which can meet the needs of users and improve the dynamic stability of the power grid.
作者
李佳佳
俞兴伟
洪挺
Li Jiajia;Yu Xingwei;Hong Ting(Zhoushan Power Supply Company,State Grid Zhejiang Electric Power Co.,Ltd.,Zhoushan 316000,Zhejiang,China)
出处
《电测与仪表》
北大核心
2021年第12期39-48,共10页
Electrical Measurement & Instrumentation
基金
国网浙江省电力有限公司群创项目(5211ZS21000A)。
关键词
电动汽车
虚拟同步机
充放电控制
一次调节
动态稳定
electric vehicle
virtual synchronous machine
charge and discharge control
primary regulation
dynamic stability
