用于可再生能源发电并网技术的混合储能控制策略研究

发布时间：2018-02-27 00:31

本文关键词： 可再生能源风电混合储能容量配置　出处：《华北电力大学》2014年硕士论文　论文类型：学位论文

【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。
[Abstract]:With the increasing of installed capacity and permeability of wind power, the impact of its volatility and intermittency on the power grid becomes more and more obvious. In order to reduce the fluctuation of wind power and improve the acceptance capacity of power grid, energy storage system has been widely used. In this paper, the control strategy of hybrid energy storage system is proposed to suppress the fluctuation of wind power, and the optimal configuration method of capacity is analyzed. The main contents are as follows:. First of all, a hybrid energy storage power allocation method is proposed to suppress the fluctuation of wind power. Based on the system model, according to the characteristics of different energy storage equipment, Based on the principle of empirical mode decomposition, wind power is divided from frequency domain and distributed to batteries and supercapacitors. At the same time, the output power of storage energy is adjusted according to the charge state. The simulation results show that the proposed method is effective in stabilizing the energy storage equipment, exerting the characteristics of the energy storage equipment and maintaining the stability of the charged state of the equipment. Secondly, because the efficiency and economy of the system are directly affected by the capacity allocation, a hybrid energy storage capacity allocation method based on the whole life cycle cost is proposed, which uses the rain flow counting method to calculate the discharge depth of the battery. Then the life of the battery is quantified by the equivalent cycle life method. Based on the analysis of the cost of each stage, the minimum annual cost is taken as the goal, and the constraints of confidence and the charging state of the energy storage equipment are taken into account. The corresponding relationship between annual cost and capacity allocation is obtained. The simulation results show that compared with the traditional single-type capacity allocation method, this method reduces the cost of energy storage system in the whole life cycle, and has more practical significance. Finally, a hybrid energy storage application platform is developed by using Matlab GUI graphical interface and compiled into an independent executable file. The software has good versatility and interactivity. It can be used to analyze the power stabilization and capacity configuration of different wind farms.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

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