三端口变换器的电容电荷平衡控制技术研究
Research of Control Strategy Based on Capacitor Charge Balance for the Three-port Converter
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摘要: 集成三端口功率变换器(three-port converter,TPC)具有变换效率高、系统集成度高、功率密度高的优点,广泛应用于新能源系统。传统PI控制可以应用于TPC系统,但PI控制属于线性控制,其基本特性导致系统动态性能难以保证最优。因此,该文提出针对TPC的负载突变以及功率分配的电容电荷平衡控制(capacitive charge balance control,CBC)方案,该算法基于电容电荷平衡原理,推导出最优动态响应曲线,通过控制系统动态过程中的开关状态,使系统按照最优动态响应曲线运行,优化系统动态性能。最后设计并制造一台全桥三端口变换器原理样机,并且通过提供实验结果验证所提出控制方法的有效性。Abstract: The integrated three-port power converter（TPC） is widely used in renewable power system due to its characteristics of high conversion efficiency, high system integration and high power density. Traditional PI control can be used in TPC systems, but its basic characteristics make it difficult to achieve the optimal dynamic performance of the system. Therefore, a novel scheme for TPC load mutation and power distribution based on capacitance charge balance（CBC） was proposed. By calculating the optimal control time points and duty cycle series according to the theoretical ideal dynamic response curve, the optimal dynamic performance of the system was achieved. Finally, a full-bridge three-port converter（FB-TPC） prototype was designed and the effectiveness of the proposed control method was verified by experiments.
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