微电网是目前国内外应用较为广泛的一种绿色可再生能源，近几年我国微电网产业的发展十分迅速。然后，越来越多的微电网系统建立并网，微电网产生的电能受外界因素影响较大，具有一定的随机性和波动性，给并网后的电力系统稳定性带了巨大的影响。然后建立微电网厂的储能系统是改善此种情况的最好的解决办法。因此，近年来微电网场储能装置的装备、容量配置及风储联合运行控制成为了研究和应用示范的热点。

针对孤岛微电网的优化调度问题进行研究，在考虑一般负荷作为可平移负荷，柴油机的治污成本和蓄电池放电循环损耗成本的基础上，采用以运行成本最低和负荷满意度最大为目标函数。通过对微电网机组、光伏发电和微电网内重要负荷及一般负荷的日前预测，在满足系统供需平衡的前提下，记及蓄电池充放电功率及SOC范围、微电网和光伏最大发电功率、柴油机最大最小发电功率等约束条件。采用混合整数线性优化方法对多目标日前优化调度模型进行求解。仿真结果表明采用该日前优化调度方法，可最小化蓄电池的使用量并充分发挥可再生能源的作用。

同时由于储能电池成本高、使用寿命相对较短，往往需要以很小的储能容量配置来担负微电网场的有功出力平滑任务，这同时也给电池系统的控制带来了挑战。本文中以某中型实际风场为例，就风储联合运行中的控制策略进行了研究，着重探讨了以锂离子电池储能系统、并网、能量转换等相关的控制策略。

关键词：微电网；风力发电；储能系统；并网

Abstract

Microgrid is a kind of green and renewable energy which is widely used at home and abroad. In recent years, China's microgrid industry has developed rapidly.Then, more and more microgrid systems are connected to the grid. The electric energy generated by the microgrid is greatly affected by external factors and has certain randomness and volatility, which has a huge impact on the stability of the power system after grid connection.Then establishing the energy storage system of the microgrid plant is the best solution to improve this situation.Therefore, in recent years, the equipment, capacity configuration and combined operation control of the energy storage device in microgrid field have become the focus of research and application demonstration.

In this paper, the optimal scheduling problem of isolated microgrid is studied. On the basis of considering the general load as the translational load, the pollution control cost of diesel engine and the discharge cycle loss cost of battery, the objective function of the lowest operating cost and the maximum load satisfaction is adopted.Based on the day-ahead prediction of the important and common loads in the micro-grid units, photovoltaic power generation and micro-grid, under the premise of satisfying the balance between supply and demand of the system, the constraints such as battery charge and discharge power, SOC range, maximum power generation of micro-grid and photovoltaic power generation, maximum and minimum power generation of diesel engine, etc., are recorded.The mixed integer linear optimization method was used to solve the multi-objective day-ahead optimization scheduling model.The simulation results show that the optimal scheduling method can minimize the consumption of battery and give full play to the role of renewable energy.

At the same time, due to the high cost and relatively short service life of the energy storage battery, it is often required to undertake the active power output smoothing task of the micro-grid field with a small energy storage capacity configuration, which also brings challenges to the control of the battery system.In this paper, a medium-sized actual wind field is taken as an example to study the control strategy in the combined operation of wind storage, focusing on the Li-ion battery energy storage system, grid connection, energy conversion and other related control strategies.

Keywords: Micro power grid;Wind power generation;Energy storage system;interconnection