【作者】 程成；

【导师】 韩晓娟；

【作者基本信息】 华北电力大学 ， 控制工程（专业学位）， 2014， 硕士

【摘要】 随着风电装机容量和渗透率的不断提高,其波动性和间歇性给电网造成的冲击越来越明显,接入电网的迫切需求与电网有限的承受能力之间的矛盾也逐渐增加。为降低风电功率波动和提高电网的接纳能力,储能系统已得到广泛应用。针对这一现状,本文提出了用于平抑风电功率波动的混合储能系统控制策略,并对容量优化配置方法进行了分析,主要内容如下：首先,本文提出了一种用于平抑风电功率波动的混合储能功率分配方法。在建立系统模型的基础上,根据不同储能设备的特点,使其承担不同的平抑任务。文中基于经验模态分解原理,将风电功率从频域上进行划分并分配给电池和超级电容器,同时根据荷电状态对储能的输出功率进行调整,以避免储能的过充或过放。仿真结果表明,该方法的平抑效果显著,且充分发挥了储能设备的特性,维持了设备荷电状态的稳定。其次,由于系统平抑效果和经济性受容量配置的直接影响,提出一种基于全寿命周期成本的混合储能容量配置方法。该方法利用雨流计数法计算电池放电深度,进而通过等效循环寿命方法对电池的寿命进行量化。在分析各阶段所产生的成本的基础上,以年均成本最小为目标,并考虑置信度和储能设备荷电状态的约束,得到了年均成本与容量配置的对应关系。仿真结果表明,相比于传统的单类型容量配置方法,该方法削减了储能系统在整个生命周期的成本,更具有现实意义。最后,综合前文的研究成果,利用Matlab GUI图形界面开发了混合储能应用平台,并将其编译成为独立可执行文件。该软件具有良好的通用性和交互性,可用于不同风电场功率平抑与容量配置的分析。更多还原

【Abstract】 With the increasing of wind power capacity and penetration, the adverse impacts to the grid have become more and more prominent. The contradiction between the demand of wind farm connected into the grid and the receptivity of the grid is getting expanded. Energy storage systems have been widely used to reduce the wind power fluctuations and improve receptivity of the grid. In response to this situation, this paper proposes the control strategy of hybrid energy storage system to stabilize wind power fluctuations, and analyses the capacity configuration method. Main contents are as follows.Firstly, this paper proposes a power allocation method of hybrid energy storage system for stabilizing wind power fluctuation. Based on the system model, energy storage devices undertake different stabilizing tasks depending on the particular characteristics. In this paper, the wind power is divided and distributed to batteries and supercapacitors from the frequency domain using empirical mode decomposition theory. Simultaneously, according to the state of charge, adjust power outputs of the energy storage to avoid over-charge or over storage discharge. Simulation result shows that the stabilizing effect is remarkable, and gives full play to the characteristics of the energy storage devices, maintaining the stability of state of charge.Secondly, since the stabilizing effect and economy impacted directly by the capacity configuration, a hybrid energy storage configuration method is proposed based on life cycle cost. The paper calculates the depth of battery using the rain-flow-counting method, and quantifies the life according to the equivalent cycle life curve. By analyzing the cost structure of each stage, the paper establishes capacity allocation model using the minimum annual cost as objective and state of charge, confidence as constraints. Simulation result shows that compared to traditional capacity configuration method, this method reduces the life cycle costs of energy storage system and more practical significance.Finally, combining the foregoing findings, the paper develops a hybrid energy storage application platform using Matlab GUI graphical interface, and compiles it as an independent executable file. The software has a good versatility and interactivity, and can be used for various wind farm power stabilizing and capacity configuration analysis.更多还原