风力太阳能等新能源发电存在不连续、不稳定、随时间和季节变化等特点，直接并网会造成电压闪变、功率频率波动等不良影响。电力储能技术可以有效改善新能源发电的电能质量，减小对电网的不良影响。 风力发电系统中常用的是蓄电池储能，为了降低成本减小电池容量，电池经常处于深度放电的状态，同时又受到充放电次数的限制，导致电池容易损坏。本文采用超导储能和电池储能相结合的混合储能系统，来配合平抑风电功率的波动，同时改善电池的性能提高电池的寿命。 本文首先研究了单一储能系统的拓扑结构和控制策略。储能系统并联在风机出口的交流侧母线上，AC/DC变流器采用功率外环电流内环的前馈解耦方法进行功率控制，超导储能的V/I斩波器采用直接计算占空比的方式实现对超导磁体电流的控制；电池储能的双向DC/DC采用电压电流双闭环来控制功率的交换。储能系统能够实现对功率变化的快速响应，做到有功无功四象限独立运行，满足平滑风电功率波动的需求。 本文以超导储能和蓄电池储能为例，研究了该混合储能系统对风力发电功率波动的抑制。为了发挥两种储能的优势，设计超导储能平抑高频尖峰功率，电池储能平抑低频波动功率。在储能系统输出功率的曲线基础上，给出了储能装置的功率等级和能量容量的设计方法，并在此基础上讨论了功率分配用的低通滤波器的时间常数如何选择。为了度量功率平抑的效果，采用公共连接点功率的标准差作为衡量标准，并入混合储能后公共连接点功率标准差得到了很好的改善。仿真结果表明采用了混合储能后，电池的充放电次数和放电深度明显降低，在一定程度上改善了电池的性能延长了电池的寿命。

Renewable energy generations such as wind power and solar photovoltaic power have characteristics of discontinuity, instability, changing with time and seasons, etc. Connecting with grid directly will cause some bad influences including voltage flicker, power and frequency fluctuations, etc. The usage of electric power energy storage technology can improve the power quality and reduce the bad influences effectively. Battery energy storage is commonly used in wind power generation. But the battery is easily damaged limited by charge and discharge times and deep discharge condition caused by wind power fluctuation and battery capacity limitation. This thesis proposes a hybrid energy storage system combined of superconducting magnetic energy storage (SMES) and battery energy storage system (BESS) to suppress wind power fluctuations, as well as improve the battery performance and working life. Firstly, this thesis studies the single energy storage system topology and control strategy. The energy storage system is located on the AC bus in parallel with wind turbines exportation. The power exchange of AC/DC is controlled by power and current closed loop feedforward decoupling method. The superconduting coils current is controlled by calculating the duty factor of the SMES V/I chopper directly. The power of BESS bidirectional DC/DC is controlled by voltage and current double closed loop. Each energy storage system can reponse the power change fastly, and operate the active and reactive power in four quadrants, to thus meeting the demand of smoothing wind power fluctuations. This thesis studies the wind power suppression by hybrid energy storage system (HESS) combined with SMES and BESS. The SMES and BESS are designed to absorb high frequency power and low frequency power respectively. The power degree and energy capacity is designed based on the curve of the energy storage system output power. The choice of low pass filter time constant is also discussed. The power standard deviation of point of common connection is used to measure the effect of power suppression, which is decreased in the condition of HESS. The simulation results show that the battery charging and discharging times and discharging depth performances are improved after using HESS. Therefore the lifetime of battery is enlengthed to some extent.