基于直流环流注入的MMC储能系统相间功率均衡控制策略Interphase Power Equalization Control Strategy for MMC Energy Storage System Based on DC Circulating Current Injection
王帅;荆龙;吴学智;李金科;武文;王小星;杨海倩;
摘要(Abstract):
在网压不平衡工况下,模块化多电平储能系统(modular multilevel converter energy storage system,MMCESS)如果以并网电流平衡为控制目标,虽然可以保证交流系统安全运行,但是会引起各相放电速度不同,导致子模块储能电池荷电状态(state of charge,SOC)的不均衡。为解决上述问题,首先对比分析了传统MMC和MMC-ESS的内部环流特性;然后分析了以并网电流平衡为目标的不平衡网压控制对电池SOC的影响;针对这一问题,提出了利用注入直流环流的控制策略,有效地实现了相间功率均衡,并论述了直流环流控制器参数对系统稳定性的影响;以各相电压跌落度为变量,绘制各相注入的直流环流占额定桥臂电流比例的三维图,针对不同跌落度分析了各相桥臂电流的变化,为设备器件选型提供了依据;最后,通过仿真和实验验证了理论分析的正确性及控制策略的可行性。
关键词(KeyWords): 模块化多电平变流器;储能系统;不平衡网压;环流
基金项目(Foundation): 国家能源应用技术研究及工程示范项目(NY20150301)~~
作者(Author): 王帅;荆龙;吴学智;李金科;武文;王小星;杨海倩;
Email:
DOI: 10.13335/j.1000-3673.pst.2017.0021
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