Anhui Province Renewable Energy Utilization and Energy Saving Laboratory (Hefei University of Technology), Hefei 230009, China
This work is supported by National Natural Science Foundation of China (No.51907045) and Anhui Provincial Natural Science Foundation of China (No. JZ2019AKZR0255).
Parameters optimization of secondary voltage and frequency regulation controllers plays a key role in improving voltage and frequency quality in microgrid, especially for a microgrid system which consists of inverters controlled by droop or virtual synchronous generator (VSG) control. In order to complete the process of parameters optimization, the first step is to construct the voltage and frequency response model of microgrid. However, due to the complex structure of the microgrid system, multiple kinds of micro sources, loads and widely-used commercial power supply, the source model is hard to be obtained, which brings about lots of difficulties in microgrid mechanism modeling. To solve the above problem, a model structure of voltage and frequency at point of common coupling (PCC) for microgrid system is established. The transfer function in the model is identified by operation data sampled in the microgrid and system identification algorithm, and the parameters of second voltage and frequency controller in microgrid system is optimized by identified model. The proposed method can model the microgrid without knowing the inter structure of microgrid and source model, and the order of built model is low which is convenient for parameter planning of regulator. Finally, the effectiveness of proposed method is verified by experiments in test platform for microgrid.
SHI Yong,XU Dong,YU Hongru,et al.Parameters Design Method of Secondary Voltage and Frequency Regulation Controller in Microgrid Based on System Identification Modeling[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190712002.