摘要
在高压大功率储能应用场景中采用中压储能系统相对低压储能系统具有更高的效率。目前基于级联H桥的中压储能系统研究较多,但已有研究多集中于并网运行,离网控制研究较少。该文对基于级联H桥的模块化多电平中压储能系统的离网运行控制进行了阐述。建立了级联H桥中压储能系统的离网模型,提出了包含交流电压外环和电流内环的中压储能系统离网电压控制策略,并针对离网运行时单相负载较多,三相电压容易不平衡的问题,提出了三相电压不平衡补偿控制方法。搭建了MATLAB/RT_LAB实时仿真系统,对上述控制进行了仿真验证。结果表明,三相负载平衡时,负载端电压保持恒定,电流内环跟踪精确;三相负载不平衡时,经电压不平衡补偿后,负载端的三相电压仍然能保持平衡,负载三相电流则随三相负载的大小而不同,仿真证明了该文提出的级联H桥中压储能系统离网控制策略的有效性。
In the high-voltage high-power energy storage applications,using the medium voltage energy storage system（ ESS） can get higher efficiency than using the lowvoltage ESS. At present,there are some researches on the H-bridge cascaded medium voltage ESS,but most of them are about on-grid control,the off-grid control research is lack. This paper introduces the off-grid control of H-bridge cascaded modular multilevel medium voltage ESS,establishes the off-grid model of H-bridge cascaded medium voltage ESS,proposes the off-grid voltage control strategy for medium voltage ESS with containing both AC voltage outer loop and current inner loop,and presents the compensation control method according to the three-phase voltage unbalance caused by the one-phase load during off-grid operation. Then,we build a real-time simulation system in M ATLAB / RT_ LAB to verify the above control methods. The results showthat,when the three-phase load is symmetrical the load terminal voltage is constant and the current in the inner control loop can followit reference exactly;when the three-phase load is unbalanced,the load terminal three-phase voltage can still be kept symmetrical after the voltage compensation,and the three-phase load current is different depending on the value of the each phase load. The simulation results showthe effectiveness of the proposed off-grid control method for the H-bridge cascaded medium voltage ESS.
作者
陈辉
王德顺
殷正刚
吴敏秀
师长立
汪建威
CHEN Hui WANG Deshun YIN Zhenggang WU Minxiu SHI Changli WANG Jianwei(State Grid Jiangsu Electric Power Company, Nanjing 210024, China China Electric Power Research Institute, Nanjing 210003, China Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China State Grid Yangzhou Power Supply Company, Yangzhou 211400, Jiangsu Province, China China Electric Power Complete Equipment Company, Beijing 100080, China)
出处
《电力建设》
北大核心
2017年第3期69-76,共8页
Electric Power Construction
基金
国网江苏省电力公司科技项目(J2016071)
关键词
中压储能系统
离网控制
级联H桥变流器
medium voltage energy storage system
off-grid control
H-bridge cascaded converter
