针对光伏等可再生能源发电的间歇性和功率波动问题，提出一种新型的用于混合储能的组合级联式隔离型多端口变流器拓扑结构及其控制策略。该装置由蓄电池组、超级电容器组、多端口隔离半桥DC/DC变换器和级联式H桥DC/AC变换器组合而成。首先对该拓扑的工作原理进行了分析；然后结合相应的控制策略，通过滑动平均滤波算法将外界给定目标功率指令在各储能单元之间进行合理分配，并在PLECS上搭建了基于该装置的光伏电站并网模型进行仿真；最后，结合仿真结果和实际工程案例对该装置可带来的经济效益进行了定量分析。结果表明，所提出的混合储能拓扑结构可有效结合超级电容器功率密度高、响应速度快，和蓄电池能量密度高、适用于平抑长周期缓慢功率波动的特点，提高了间歇式电源并网运行的电能质量和可调度性，同时避免了蓄电池频繁充放电，显著延长了电池使用寿命。该装置可用于基于蓄电池-超级电容器混合储能（BSHES）的大功率储能电站，实现平滑可再生能源发电输出功率波动和微电网中的调频调压功能，模块集成度高，可实现模块化生产，具有广阔的应用前景。%For the photovoltaic and intermittent energy power generation power fluctuation, this paper presents a novel multiport isolated converter topology and its control strategy of combination cascade type for hybrid energy storage. The device consists of battery packs, super capacitor packs, multiport isolated half-bridge DC/DC converter and cascaded H-bridge DC/AC converter. The working principle of this topology is analyzed, and then combined the corresponding control strategy, through the sliding average filter algorithm, the outside given power instructions will be in all storage allocation units;and finally, this paper makes a quantitative analysis on economic benefits of the device based on the simulation results and the actual project data. The results of simulation show that the proposed topology can be effectively combined with the characteristics of super capacitor of high power density, fast response speed and battery applied to stabilize the long periodic slow power fluctuation, improving the operation of intermittent power grid power quality and dispatchableability, while avoiding the battery charge and discharge frequently. The device can be used for high power energy storage power station based on battery and super-capacitor hybrid energy storage (BSHES), to realize the function of smoothing renewable energy power generation output power and frequency or voltage modulation in the micro grid;each module can realize high integration degree and modular production, so it has a broad application prospect.
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