平抑风电功率波动的混合储能控制策略研究

发布时间：2019-01-01 16:23

【摘要】：平抑风电功率短时波动可有效抑制风电并网对电力系统调频的不良影响，而受物理条件约束，，单一类型储能介质都难以单独承担对风电功率短时波动的平抑任务。由多类型储能介质构成的混合储能系统具有循环次数高、功率密度高和能量密度高等优点，可望成为平抑风电功率波动的有效储能形态。混合储能系统应用的关键是如何选择其配置并设计合理有效的控制策略，在满足风电功率波动平抑需求的基础上实现运行成本的最小化。以某风电场运行数据为基础，分析了风电机组-风电场短时波动特性，为混合储能系统在平抑风电功率短时波动中的应用提供实证基础。针对电池-超级电容器构成的混合储能系统，设计了含滞环控制的低通滤波平滑控制策略以抑制风电功率短时波动。考虑储能系统工作状态，基于滑动平均值原理确定了电池参考输出功率，以实现电池对风电功率趋势性波动分量的控制，超级电容器用以平抑风电功率快变波动分量。研究最小化混合储能系统成本的优化配置方法。综合考虑储能介质自身特性，建立了基于全生命周期成本的混合储能系统年均成本计算模型。以最小化混合储能系统年均成本为目标，研究满足风电功率波动平抑要求的最优运行控制参数和两种储能介质的配置及成本。仿真分析基于风电场运行数据验证了所提控制策略的有效性，并分析了相关运行控制参数对混合储能系统运行技术性和经济性的影响，得到储能系统的最优控制参数和配置结果。基于所研究的混合储能系统控制策略及配置方法，在Visual Studio和SQLsever环境下构建了风-储联网运行分析平台。实现对风电/负荷数据的管理及分析，为实际工程中储能系统运行性能分析及配置选择提供可视化操作平台。
[Abstract]:The short term fluctuation of wind power can effectively restrain the adverse effect of wind power grid connection on frequency modulation of power system. However, the single type of energy storage medium can hardly take the task of suppressing the short term fluctuation of wind power alone, which is restricted by physical conditions. The hybrid energy storage system composed of multi-type energy storage media has the advantages of high cycle times, high power density and high energy density, which is expected to be an effective energy storage form for suppressing the fluctuation of wind power. The key to the application of hybrid energy storage system is how to select its configuration and design a reasonable and effective control strategy to minimize the operation cost on the basis of satisfying the demand of wind power fluctuation. Based on the operation data of a wind farm, the short-time fluctuation characteristics of wind turbine and wind farm are analyzed, which provides an empirical basis for the application of hybrid energy storage system in stabilizing the short-term fluctuation of wind power. A low pass filter smoothing control strategy with hysteresis control is designed for hybrid energy storage system composed of battery and supercapacitor to suppress short term fluctuation of wind power. Considering the working state of the energy storage system, the reference output power of the battery is determined based on the principle of sliding average, so as to realize the control of the trend fluctuation component of the wind power by the battery, and the supercapacitor is used to stabilize the fast fluctuating component of the wind power. The optimal configuration method for minimizing the cost of hybrid energy storage system is studied. Considering the characteristics of energy storage medium, an annual cost calculation model of hybrid energy storage system based on full life cycle cost is established. Aiming at minimizing the average annual cost of hybrid energy storage system, the optimal operating control parameters and the configuration and cost of two kinds of energy storage media are studied to meet the requirements of wind power fluctuation and stabilization. The effectiveness of the proposed control strategy is verified by simulation analysis based on wind farm operation data, and the influence of related operation control parameters on the technical and economic performance of hybrid energy storage system is analyzed. The optimal control parameters and configuration results of the energy storage system are obtained. Based on the control strategy and configuration method of hybrid energy storage system, an analysis platform of air-storage network operation is constructed under Visual Studio and SQLsever environment. It realizes the management and analysis of wind power / load data and provides a visual operating platform for performance analysis and configuration selection of energy storage system in practical engineering.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

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