基于冗余矢量的中点箝位型三电平双有源桥变换器的电容电压平衡策略  

Capacitor Voltage Balancing Strategy of NPC Three-level Dual-active Bridge Converter Based on Redundant Vector

作　　者：刘超 李驰[2] LIU Chao;LI Chi(Zhuhai EWPE Information Technology Inc.,Zhuhai,Guangdong 519070,China;Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]珠海艾维普信息技术有限公司,广东珠海519070 [2]清华大学电机工程与应用电子技术系,北京100084

出　　处：《控制与信息技术》2023年第1期45-51,共7页CONTROL AND INFORMATION TECHNOLOGY

摘　　要：中点箝位型(NPC)三电平双有源桥(DAB)变换器相对传统DAB变换器可以实现更高的电压等级和更宽的运行范围,具有广阔应用前景;但NPC型DAB变换器存在电容器电压不平衡的问题,影响变换器的运行性能。文章针对NPC型DAB变换器进行了三自由度控制策略的功率传输特性分析,并根据功率传输特性实现了对其功率传输的有效控制。对于其电容电压不平衡问题,文章提出了一种基于冗余矢量的电容电压平衡策略,相对于传统的电容电压平衡策略,该平衡策略可以在不影响传输功率的基础上实现更快的电容电压平衡。仿真结果表明,文章所提控制策略可使变换器在输出电压参考值改变时,电容器电压仍能很好地维持平衡状态,实现在仅有1%波动量的暂态情况下,在0.000 4 s内趋于稳定。The neutral point clamped(NPC) three-level dual-active bridge(DAB) converter can be applied at higher voltage levels and in a wider operating range than the traditional DAB converter, and therefore it is more promising in future applications.However, the NPC DAB converter suffers from unbalanced capacitor voltage, which affects the operating characteristics. This paper analyzes the power transmission characteristics of the NPC DAB converter in the three-degree-of-freedom(3-DOF) control strategy,based on which power transmission can be effectively controlled. For the capacitor voltage imbalance problem, a capacitor voltage balancing strategy based on redundant vector is proposed. Compared to the traditional capacitor voltage balancing strategy, the proposed strategy can achieve faster capacitor voltage balance without affecting the transmission power. The proposed strategy was verified by simulation that it can well maintain the capacitor voltage at a balanced state for the converter subject to changes in the output voltage reference value, i.e. the capacitor voltage balancing can be realized within 0.000 4 s under the transient condition of only 1% fluctuation.

关 键 词：中点箝位型 双有源桥变换器 电容器电压平衡 冗余矢量 功率传输特性 

分 类 号：TM464[电气工程—电器]