风光储混合互补发电系统研究

发布时间：2019-05-10 17:38

【摘要】：近年,传统能源危机使得新能源入网容量不断攀升,新能源的波动特性给系统带来了一系列新的挑战,尤其是在系统稳定方面的问题更加突出。考虑到风力发电、光伏发电的自然特性存在互补性,故利用风光混合发电系统能够有效的降低风力发电、光伏发电等系统独立供电时的功率波动性。为了进一步降低新能源并网对系统稳定性的影响,一般通过储能装置实现对混合系统的功率调节,进而风光混合发电系统又可称为风光储混合发电系统。然而在实际的电力系统调度操作过程中,只有将混合发电系统纳入电网的调度系统中,并按照调度中心下发的调度指令对外送功率实现控制,才是大型风光储混合发电系统安全并网运行的趋势。为了提高风光储混合发电系统外送功率的稳定性,本文主要进行了以下几方面的工作： 1.在不同的时间尺度上分别分析了确定装机容量下风力发电、光伏发电的发电特亲,如按月份及按小时机组发电量的涨落； 2.分别对风力发电、光伏发电的功率特性进行深入研究,尤其是对光伏发电的倾斜角进行了优化,对比了光伏发电不同倾斜角对混合系统的影响； 3.分别以年和天为周期,分析混合系统风、光不同容量配比时的互补效果,优化出出风光容量的最佳配比值,在此基础上,进一步考虑不同容量的储能电池对风光储混合发电系统的影响。本文建立了以维持风、光发电机当前状态不变为优化目标,以调度系统下发指令、国标规定的最小输出功率为限制、风力发电优先等为约束条件。本文所提策略具有以下两点创新：第一,将新能源机组及系统测的预测功率信息加入到分配策略中；第二,在分配策略中考虑了新能源机组的状态信息并对进行分类。在上述控制策略的基础上,本文分别分析了风力发电、光伏发电自身的特性,并搜索出光伏发电的最优倾角,同时对本文所提的功率分配策略进行了仿真验证,将仿真结果与平均分配策略所得仿真结果进行对比分析,结果表明,本文设计的分配策略,能够有效地提供风光储能发电系统的发电效率,并且具有较小的误差。
[Abstract]:In recent years, the traditional energy crisis has led to the rising capacity of new energy into the network, and the fluctuation characteristics of new energy have brought a series of new challenges to the system, especially in the aspect of system stability. Considering that the natural characteristics of photovoltaic power generation are complementary to wind power generation, wind-wind hybrid power generation system can effectively reduce the power volatility of wind power generation, photovoltaic power generation and other independent power supply systems. In order to further reduce the influence of new energy grid connection on the stability of the system, the power regulation of the hybrid system is generally realized through the energy storage device, and then the wind hybrid power generation system can also be called the wind storage hybrid power generation system. However, in the actual power system dispatching process, only the hybrid generation system is included in the dispatching system of the power grid, and according to the dispatching instructions issued by the dispatching center, the power is transmitted to the outside of the power system to achieve control. It is the trend of safe grid-connected operation of large-scale wind storage hybrid power generation system. In order to improve the stability of the outgoing power of the wind storage hybrid power generation system, the main work of this paper is as follows: 1. At different time scales, the special relatives of wind power generation and photovoltaic power generation under fixed installed capacity are analyzed respectively, such as the fluctuation of power generation by month and hour; 2. The power characteristics of wind power generation and photovoltaic power generation are deeply studied, especially the tilt angle of photovoltaic power generation is optimized, and the effects of different tilt angles of photovoltaic power generation on the hybrid system are compared. 3. According to the period of year and day, the complementary effect of different wind and light capacity ratio of hybrid system is analyzed, and the optimum ratio of wind and light capacity is optimized. The influence of different capacity energy storage batteries on wind storage hybrid power generation system is further considered. In this paper, the minimum output power specified by the national standard is limited and the wind power generation priority is taken as the constraint condition to maintain the wind, the current state of the optical generator does not become the optimization goal, the dispatching system issues the instruction, the minimum output power specified by the national standard is limited, and the wind power generation priority is taken as the constraint condition. The strategy proposed in this paper has the following two innovations: first, the predicted power information measured by new energy units and systems is added to the distribution strategy; second, the state information of new energy units is considered and classified in the distribution strategy. On the basis of the above control strategy, this paper analyzes the characteristics of wind power generation and photovoltaic power generation, and finds out the optimal inclination angle of photovoltaic power generation. At the same time, the power allocation strategy proposed in this paper is simulated and verified. The simulation results are compared with the simulation results of the average distribution strategy. The results show that the distribution strategy designed in this paper can effectively provide the power generation efficiency of the wind energy storage power generation system, and has a small error.
【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】：TM61

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