This paper presents the digital implementation of a current controlled grid connected inverter for Thermoelectric Generator (TEG) sources. Considering the electrical characteristics of a TEG source, several important aspects that a designer has to consider in selecting the rating of power converters for the grid connected operation of TEG source are discussed. The closed loop control of a TEG fed grid connected voltage source inverter (VSI) requires line current control to regulate the power pumped into the grid. Considering the inverter, current sensor and line inductor models, a simplified method is espoused to determine the parameters of the digital current controller. An Altera Cyclone II FPGA board is used to implement the current control strategy in VSI fed with TEG power source. The proposed design approach is validated using simulations and experiments and verified with the time domain specifications.

本文介绍了用于热电发电机（TEG）源的电流控制并网逆变器的数字实现。考虑到TEG源的电气特性，讨论了设计师在选择TEG源并网运行的功率转换器的额定值时必须考虑的几个重要方面。TEG馈入电网的电压源逆变器（VSI）的闭环控制需要线电流控制来调节泵入电网的功率。考虑到逆变器，电流传感器和线路电感器模型，采用简化方法确定数字电流控制器的参数。Altera Cyclone II FPGA板用于在由TEG电源供电的VSI中实施电流控制策略。