In hybrid AC/DC Microgrid, the tightly regulated loads could be regarded as constant power loads (CPLs), usually inducing negative impedance instability problems. This paper investigates large signal stability of hybrid AC/DC microgrid in grid-connected mode based on mixed potential theory, and the characteristics of CPLs are considered in the storage system charging and discharging mode. Firstly, the entire system is converted from abc frame to dq rotating frame. Then the mixed potential models are built, and large signal stability criteria are derived. The obtained criteria interpret relationships among the maximum power of the CPLs, the capacitance, the inductance, the control parameter kip of the current inner loop and the control parameter kvp of the voltage outer loop. When the storage system changes from charging to discharging mode, the maximum power of the CPLs that the system can support would increase significantly. Finally, simulation results are used to verify the validity of the obtained criteria.
刘欣博, 孙晓溪, 宋晓通. 带恒功率负载的交直流混合微电网系统大信号稳定性分析[J]. 电工技术学报, 2021, 36(zk1): 115-125.
Liu Xinbo, Sun Xiaoxi, Song Xiaotong. Large-Disturbance Stability Analysis of Hybrid AC/DC Microgrid with Constant Power Loads. Transactions of China Electrotechnical Society, 2021, 36(zk1): 115-125.
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