In vehicle-to-grid (V2G) applications, a voltage source inverter (VSI) directly connects to a residential load or grid for DC/AC conversion and power flow control. In VSI, dead-time is employed to prevent the breakdown of switching devices, however, the introduction of dead-time leads to distortions of output voltage and current in both stand-alone and grid-tie modes. For the case of a power factor of 1, by analyzing the dead-time effect of digital-controlled double-frequency sinusoidal pulse width modulation, a compensation amount is proposed to introduce in the modulation signals, the value of which is half of the delay register that generates a dead-time of t_d. Moreover, considering the phase delay caused by hardware and software filtering in sampling, the grid-tie mode control strategy based on dead-time compensation is further proposed, which introduces the grid voltage as a feedforward signal. A 3.5 kW V2G experimental prototype is built and tested to verify the feasibility of the proposed strategies. The simulation and experimental results show that the proposed methods are effective for both modes, which improve the output distortion for different dead-time without additional hardware circuits.

中文翻译：

---

V2G系统中单相逆变器输出质量的改善

在车辆到电网（V2G）应用中，电压源逆变器（VSI）直接连接到住宅负载或电网以进行直流/交流转换和潮流控制。在VSI中，采用死区时间来防止开关器件击穿，然而，死区时间的引入会导致独立模式和并网模式下输出电压和电流的畸变。针对功率因数为1的情况，通过分析数控双频正弦脉宽调制的死区效应，提出在调制信号中引入补偿量，补偿量的值为延迟的一半产生死区时间t _d的寄存器。此外，考虑到采样时硬件和软件滤波引起的相位延迟，进一步提出了基于死区时间补偿的并网模式控制策略，该策略引入电网电压作为前馈信号。搭建并测试了 3.5 kW V2G 实验样机，以验证所提出策略的可行性。仿真和实验结果表明，所提出的方法对于两种模式都是有效的，无需额外的硬件电路即可改善不同死区时间的输出失真。