链式蓄电池/超级电容器混合储能系统在高压大功率储能场合有着广阔的应用前景，但是同相各链节输出电流相同使得输出功率耦合，由此带来了蓄电池输出电流、超级电容器SOC控制和能量均衡等方面的一系列问题，限制了储能系统的应用范围。基于由“正交功率分解”理论构建的辅助功率环，本项目提出了两种新型蓄电池/超级电容器链式混合储能系统拓扑，以及相应的奇次谐波混合调制和双频PS-PWM调制两种新型控制方式。通过向辅助功率环中注入高频电压、电流，实现链式混合储能系统对外功率输出与内部各储能单元之间功率转移的解耦控制。从而在不影响储能系统正常输出的前提下，各储能单元可以工作在不同的充放电状态。项目的研究成果将提高我国储能系统的设计优化和控制理论水平，具有重要的理论研究意义和应用价值。

Battery/supercapacitor cascaded multilevel hybrid energy storage system (CM-HESS) is an attractive solution for high voltage and high energy storage applications. But the output powers of units are coupled because they have the same output current. This situation causes problems of output voltage, battery output current, supercapacitor SOC control and energy balancing. And the control scope is constrained. Based on the auxiliary power loop constructed with orthogonal power control, this project proposes two novel battery/supercapacitor CM-HESS, odd harmonic hybrid PWM and double frequency PS-PWM. According to the orthogonal power theory, by injecting high frequency voltage and current into the novel topologies with the novel PWM methods, the output power and inner power transition between energy storage modular of the CM-HESS can be decoupled. The energy storage modular can have different charging/discharging status without effecting normal operation. Through this project, the theoretical and control level of the energy storage system will be improved apparently. Meanwhile, this project is of important theoretical significance and practical value.