This work deals with the control law design and experimental verification of a grid-forming dispatchable distributed generation based on a back-to-back converter. The proposed system brings several improvements to the prime mover as well as to the microgrid voltage quality. The control strategy is based on an inner current and an outer voltage loop for both sides of the converter. The external loop of the back-to-back input side, which is connected to the generator, is responsible for regulating the DC voltage. On the other hand, in the output side, the voltage loop ensures a high-quality AC waveform to feed the loads. A comprehensive discussion regarding the current controller with harmonic mitigation is performed to justify the controller's choice. It is shown that a suitable current controller significantly improves the disturbance rejection. A feed-forward compensation based on the load current prediction without any additional sensor is proposed to improve the output voltage quality. Experimental results are used to validate the proposed control law and to show the improvements and benefits of the system.

中文翻译：

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使用背对背转换器的可分配分布式发电，用于基于前馈作用和负载电流预测的网格形成改进

这项工作涉及基于背对背转换器的网格形成可调度分布式发电的控制律设计和实验验证。提出的系统为原动机以及微电网电压质量带来了一些改进。控制策略基于转换器两侧的内部电流和外部电压环路。连接到发电机的背对背输入侧的外部环路负责调节直流电压。另一方面，在输出侧，电压环路可确保提供高质量的交流波形以馈入负载。对具有谐波抑制功能的电流控制器进行了全面讨论，以证明控制器的选择合理。结果表明，合适的电流控制器可以显着改善干扰抑制性能。提出了一种基于负载电流预测的前馈补偿，无需任何其他传感器，以提高输出电压质量。实验结果被用来验证所提出的控制律，并显示系统的改进和好处。