新能源电力系统国家重点实验室(华北电力大学), 北京市 102206
针对两级双向充/放电机,提出一种接入微电网的电动汽车充电控制策略。首先,将虚拟同步机控制技术应用于前级AC/DC控制,引入虚拟惯量、阻尼和虚拟励磁,使得充电机具有与同步机类似的惯性阻尼特性和电压调节特性。然后,重点设计了辅助调频控制算法,根据考虑电动汽车的负载有功功率—频率特性曲线计算“功率参考值修正量”,改变电动汽车的充/放电功率参考值,使得电动汽车参与微电网一次、二次调频。基于MATLAB/Simulink仿真平台搭建有电动汽车接入的微电网模型,算例验证表明,所提出的控制策略能够在实现电动车与电网的双向功率交互的同时为微电网提供惯量、阻尼、电压和频率支撑,实现了对独立模式下微电网频率的无差调节,提高了微电网动态稳定性。
国家重点研发计划资助项目(2016YFB0101900)
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University), Beijing 102206, China
For the two levels of two-way charging machine, a kind of charge/discharge control strategy is proposed based on the virtual synchronous machine(VSM)in microgrid. First of all, the VSM is applied to control the first-level AC/DC converter, while introducing the virtual inertia, damping and excitation to make the charging machine possess the same operation characteristics as the synchronous machine. Secondly, an auxiliary frequency modulation algorithm is designed by using the active power-frequency operation curve to calculate the “correction of the active power reference” and change the power reference, which makes electrical vehicles participate in the primary and secondary frequency regulation of microgrid. Based on the MATLAB/Simulink, the microgrid model with electrical vehicles is developed. The results show that electric vehicles controlled by the proposed strategy can transmit electricity to the power system, which supports the inertia, damping, voltage and frequency, realizes the non-differential regulation of frequency in microgrid at independent mode, and improves the dynamic stability of microgrid.
[1] | 刘其辉,逯胜建.参与微电网调频的电动汽车虚拟同步机充放电控制策略[J].电力系统自动化,2018,42(9):171-179. DOI:10.7500/AEPS20170508009. LIU Qihui, LU Shengjian. Charging and Discharging Control Strategy Based on Virtual Synchronous Machine for Electrical Vehicles Participating in Frequency Regulation of Microgrid[J]. Automation of Electric Power Systems, 2018, 42(9):171-179. DOI:10.7500/AEPS20170508009. |