一种基于V2G技术的并网控制策略

A grid control strategy based on the technology of V2G

针对电动汽车并网的特殊要求,提出一种具有V2G功能的主电路拓扑结构,采用了两级式并网系统的结构,它由双向PWM逆变单元和双向DC/DC变换单元组成,并用LCL滤波代替L滤波。为了在并网时输出电流波形的质量,采用了一种新型的控制策略,克服了普通电流PWM控制法和传统PI算法的缺点,即dq坐标系下的电压电流双闭环的电压空间矢量控制策略,然后利用Matlab/Simulink对所提出的控制策略进行仿真,仿真结果验证了该控制策略的鲁棒性,且电流质量能达到并网标准,能够安全并网。

According to the special requirements of interconnection of electric cars, a kind of V2G function of main circuit topology structure is put forward,a structure of two levels of grid system is adopted,it is composed of bidirectional PWMinverter and bidirectional DC/DC converter, and the LCL filter is used to replace L filter. For the quality of output current waveform in grid connection , a new kind of control strategy is adopted , the disadvantage of common current PWM control method and the traditional PI algorithm is overcame , namely the dq coordinates of voltage and current double closed-loop voltage space vector control strategy , and Then, Matlab/Simulink is used to simulate the proposed control strategy , the robustness of the control strategy is verified in the simulation results , and current quality can achieve interconnection standards , and come to a safe interconnection.