摘要
基于T型三电平拓扑的变流器结合了传统两电平和三电平变流器的优点,可以改善并提高系统的输出特性和运行效率,有效降低功率开关管的电压应力和导通损耗。超导磁储能（superconducting magnetic energy storage,SMES）系统拥有很高的功率密度,作为新型储能装置应用于电力系统是未来的必然趋势。提出了一种基于T型三电平变流器的新型SMES拓扑结构,针对其运行过程中的非线性特性进行了端口受控哈密尔顿建模,并设计了SMES基于反馈互联结构的能量成型控制策略。仿真结果表明,基于能量成型控制及T型三电平拓扑的SMES具有较小的谐波畸变率和很好的功率跟踪性能。将其应用在风力发电系统中,有效平抑了风电波动,增强了风电场的并网能力。
Three-level T-type converter（3 LT2 C） combines advantages of two-level converter and conventional three-level converter. It can improve output performance and operation efficiency of the system and reduce voltage stress and conduction loss of power switches. As a new type of energy storage device, superconducting magnetic energy storage（SMES） system has broad application prospects in power grids because of its high power density. In this paper, mathematic models and port-controlled Hamiltonian（PCH） models of SMES based on 3 LT2 C are established. Through analysis of SMES passivity proof, energy-shaping control strategy based on feedback interconnection structure is designed to eliminate nonlinear effect. Finally, simulation results show that the proposed topology and control strategy can reduce total harmonic distortion and improve SMES power tracking capability. Its application in wind power generation system also shows that the proposed SMES can effectively stabilize wind power fluctuations and achieve an efficient grid connection of wind farms.
出处
《电网技术》
EI
CSCD
北大核心
2018年第2期607-613,共7页
Power System Technology
