电网谐波条件下基于复矢量的单相V2G系统直接功率控制

Direct power control strategy for single-phase V2G system based on complex vector under harmonic grid voltage conditions

为实现在单相电网电压畸变条件下车网互联(V2G)系统的灵活直接功率控制,首先将复矢量引入电网谐波条件下的单相瞬时功率计算,分析了电网电压畸变时的单相有功功率与无功功率的成分。在建立单相V2G系统复矢量信号模型的基础上,设计复数控制器实现了功率稳定与并网电流谐波抑制2个独立目标的控制,并采取功率前馈控制改善了系统动态性能。最后,搭建了3.5 k V·A单相V2G系统的MATLAB/Simulink仿真模型与实验系统,仿真与实验结果验证了理论分析的正确性以及所提控制方案的有效性。

In order to achieve flexible and direct power control for V2G（Vehicle to Grid） system under the condition of voltage distortion in single-phase power grid,complex vector is introduced into the calculation of single-phase instantaneous power. The components of instantaneous active power and reactive power are analyzed,in the condition of gird voltage distorted. Based on the construction of complex vector signal model for single-phase V2G system,the complex vector controller is designed to realize two selective control targets ：constant active and reactive power,sinusoidal grid current. What’s more,the power feed forward control is adopted to improve the dynamic response for V2G system. Finally,MATLAB/Simulink simulation model and experiment platform for 3.5 k V·A single-phase V2G system are developed to validate the availability of the proposed control strategy.