Operation control and stability study of converters for battery energy storage under weak grid conditions

作者：Sang, Shun; Gao, Ning; Cai, Xu; Li, Rui

来源：Proceedings of the CSEE, 2017, 37(1): 54-63.

DOI：10.13334/j.0258-8013.pcsee.151940

• Battery energy storage
• Impedance analysis
• Impedance modeling
• Low frequency range
• Operation stability
• Parallel condition
• Voltage-controlled
• Weak grid

The traditional current-controlled method has been widely used in distributed converters for battery energy storage. Based on current-controlled method, the converter has capacitive equivalent output impedance in low-frequency range, which reduces its operation stability under weak grid. In additional, resonance happens in multi-converters parallel condition. To solve this issue, the voltage-controlled method for energy storage converters was analyzed. The converter's impedance model based on voltage-controlled method was built to analyze its operation stability under weak grid. Through impedance analysis, based on voltage-controlled method, the converter has inductive equivalent output impedance, which is just like the characteristic of non-ideal voltage source and is not easy to oscillate with the increasing grid impedance. Thus, the converter is more adaptive in a weak grid. The simulation and experimental results verify the theoretical analysis.

• 出版日期2017
• 单位上海交通大学