The conventional grid-connected inverters require a sophisticated digital signal processor to generate the demanded reference signal as a feedforward signal for the sinusoidal pulse width modulation (SPWM) control. However, the reference signal needs to be re-calculated to maintain the demanded power control as the ac mains varies. It increases the computation burden of the controller and has become a major obstacle of the grid connected energy storage system with demanded power flow control. Therefore, a simplified approach to reduce the computation burden of the controller is proposed in this paper. With the proposed simplified equation for the power flow control, the usage of a low cost microcontroller unit becomes possible. In additional, no additional sensors or circuitries are needed. Meanwhile, the performance of desired power flow control by using the simplified control is almost unaffected. The proposed simplified algorithm is validated via mathematical calculations, computer simulation and experimental results. By using the proposed simplified control, 52.3% of the computational clock cycles can be reduced. Different operation scenarios were tested to validate the performance of the proposed simplified control via the MATLAB/Simulink simulations and the 1kVA prototype experiments.

中文翻译：

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具有简化SPWM控制的单相并网逆变器

传统的并网逆变器需要复杂的数字信号处理器来生成所需的参考信号，作为正弦脉冲宽度调制（SPWM）控制的前馈信号。但是，当交流电源变化时，需要重新计算参考信号以维持所需的功率控制。它增加了控制器的计算负担，并且已成为要求功率流控制的并网储能系统的主要障碍。因此，本文提出了一种简化的方法来减轻控制器的计算负担。利用所提出的用于功率流控制的简化公式，可以使用低成本的微控制器单元。另外，不需要额外的传感器或电路。与此同时，通过使用简化的控制，所需的潮流控制的性能几乎不受影响。通过数学计算，计算机仿真和实验结果验证了所提出的简化算法。通过使用建议的简化控制，可以减少52.3％的计算时钟周期。测试了不同的操作方案，以通过MATLAB / Simulink仿真和1kVA原型实验验证所提出的简化控制的性能。