In laboratory-scale studies, researchers usually prefer to use diesel generator emulator, instead of real diesel generator due to its flexibility in parameters design. Using diesel generator emulator, the behavior of a real diesel generator is emulated by a voltage source converter with voltage and current control loops in d – q frame. In this paper, an inverter-based prototype of a simple diesel generator emulator is presented for frequency variation studies in laboratory-scale microgrids. The proposed control system includes two separated paths for frequency and voltage. In the first path, two cascaded voltage and current control loops in d – q frame are employed to regulate the voltage like AVR system. In the second path, a proposed transfer function and a P – f droop curve are used to generate the reference frequency for inverse park transformation considering the transfer functions of prim-mover, governor and synchronous machine. The real diesel generator and the diesel generator emulator are simulated in MATLAB/Simulink software and compared to investigate the proposed control system. Also the experimental results verify the performance of the implemented prototype of the proposed diesel generator emulator in AUT microgrid.

中文翻译：

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用于微电网频率控制研究的基于下垂的柴油发电机仿真器

在实验室规模的研究中，由于其参数设计的灵活性，研究人员通常更喜欢使用柴油发电机模拟器，而不是真正的柴油发电机。使用柴油发电机模拟器，真实柴油发电机的行为由电压源转换器模拟，电压和电流控制回路位于 d – q 框架中。在本文中，提出了一种基于逆变器的简单柴油发电机仿真器原型，用于实验室规模微电网中的频率变化研究。建议的控制系统包括两个独立的频率和电压路径。在第一条路径中，d – q 框架中的两个级联电压和电流控制回路用于像 AVR 系统一样调节电压。在第二条道路上，考虑到原动机、调速器和同步电机的传递函数，建议的传递函数和 P-f 下垂曲线用于生成逆公园变换的参考频率。真实柴油发电机和柴油发电机仿真器在 MATLAB/Simulink 软件中进行仿真，并比较研究所提出的控制系统。实验结果也验证了所提出的柴油发电机仿真器在 AUT 微电网中实现的原型的性能。