摘要
分布式电池储能变换器一般采用电流型控制算法,变换器低频段等效容性输出阻抗导致其弱电网运行稳定性较差,多机并列运行时易引发谐振。该文针对储能变换器弱电网运行稳定性问题,研究储能变换器电压型控制算法,建立了基于电压型控制算法的变换器阻抗模型并分析其稳定性。模型的阻抗分析结果表明,采用电压型控制的储能变换器对电网呈现感性输出阻抗的非理想电压源特性,不易与持续增大的电网阻抗发生谐振,具备更佳的电网适应性。通过仿真分析与实验验证,证明了理论分析与建模过程的正确性,以及电压型控制算法的可行性。
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.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2017年第1期54-63,共10页
Proceedings of the CSEE
基金
国家自然科学基金项目(51307110)
国家电网公司科技项目(SGHB0000KXJS1400040)~~
关键词
电压型控制
电流型控制
储能变换器
弱电网运行
阻抗分析
voltage-controlled method
current-controlled method
energy storage converter
weak grid operation
impedance analysis
