应用于钠硫电池的双级式储能变流器控制策略  

Control Strategy of Two-stage Power Conversion System for Sodium Sulfur Battery

作　　者：蒋顺平[1] 丁勇[1] 李旭[1] 石祥建[1] JIANG Shun-ping;DING Yong;LI Xu;SHI Xiang-jian(NR Electric Co., Ltd., Nanjing 211102, China)

机构地区：[1]南京南瑞继保电气有限公司

出　　处：《电力电子技术》2019年第4期88-90,共3页Power Electronics

摘　　要：钠硫电池具备低电压、大电流的特性,储能变流器(PCS)的接入具有一定的挑战,此处采用双级式PCS有效解决接入问题。前级DC/DC变换器提高直流母线电压,釆用六相交错并联技术,有效解决大电流问题,降低直流电流纹波;后级DC/AC变流器通过同步旋转坐标变换,釆用前馈解耦实现有功、无功的独立控制;同时釆用顺序控制逻辑启停前后级变流器,保证储能系统的安全可靠运行。最后通过200kW钠硫电池储能系统实时数字仿真仪(RTDS)实验分析,验证所提控制策略的合理性和可靠性。The sodium sulfur battery has characteristics of low voltage and high current which bring certain challenges to the access of power conversion system(PCS).A two-stage PCS is used to effectively solve the access problem.The pre-stage DC/DC converter upgrades the direct current bus voltage and adopts a six-phase interleaving parallel connection technology to effectively solve the large current problem and reduce the direct current ripple.The post-stage DC/AC conerter adopts synchronous rotation coordinate transformation , realizes independent control of active and reactive power by feedforward decoupling control. Besides, sequential control logic is used to start and stop the pre-stage and poststage converters to ensure safe and reliable operation of total system.Finally, the real time digital simulator(RTDS) ex? perimental analysis based on 200 kW sodium sulfur energy storage system proves the rationality and reliability of the control strategy.

关 键 词：钠硫电池 双级式储能变流器 控制策略 

分 类 号：TM911[电气工程—电力电子与电力传动]