光伏电站集群主动协调控制方法研究
发布时间：2018-08-05 14:56
【摘要】：光伏发电具有间歇性和波动性的特点,大规模光伏并网会对电网稳定性造成影响。为了提高光伏的可控能力,本文提出了光伏集群的理念,利用地域上的光照互补能力,从而提高电网对光伏的接纳能力,实现光伏“似常规能源”控制。本文具有一定的理论意义和应用价值,论文的主要研究内容如下:(1)研究光伏电池的基本特性和原理,建立光伏电池模型,建立光伏电站工程模型,然后研究基于扰动观察法的光伏发电最大功率跟踪方法,通过MATLAB仿真验证方法的可行性,最后通过青海实际运行数据,对光伏模型进行仿真。(2)研究光伏电站大规模接入电网后对电网的影响,分析了光伏电站出力波动对系统频率的影响。然后研究了光伏电站有功功率控制的原理,并提出了光伏电站有功功率分层控制结构,在此基础上提出多时间尺度的光伏电站集群有功功率控制原理,对各层控制结构的功能和控制目标进行了分析。(3)对集群内部的光伏电站按照运行状态和可控能力进行分类,将光伏电站划分为三类。根据调度的有功功率调节目标,按照增出力和减出力两种不同的调度安排,建立不同的光伏电站序列。然后提出了两种功率分配方法,将调度下发的有功功率进行合理分配。一种是限出力条件下比例分配法,此方法简单易行,另一种是限出力条件下经济优化分配方法,通过遗传算法多其进行计算。最后通过算例仿真对两种方案进行对比分析,验证控制策略的可行性。
[Abstract]:Photovoltaic power generation has the characteristics of intermittent and volatility, large-scale photovoltaic grid will affect the stability of the grid. In order to improve the controllable ability of photovoltaic, the idea of photovoltaic cluster is put forward in this paper, which makes use of the complementary ability of illumination in the region, so as to improve the accepting ability of the grid to photovoltaic, and realize the control of photovoltaic "like conventional energy". This paper has some theoretical significance and application value. The main contents of this paper are as follows: (1) study the basic characteristics and principles of photovoltaic cells, establish photovoltaic cell model, establish photovoltaic power plant engineering model. Then the maximum power tracking method based on disturbance observation method is studied. The feasibility of the method is verified by MATLAB simulation. The photovoltaic model is simulated. (2) the influence of the photovoltaic power station on the power grid after large-scale connection is studied, and the influence of the fluctuation of the output force of the photovoltaic power station on the frequency of the system is analyzed. Then, the principle of active power control in photovoltaic power plant is studied, and the hierarchical control structure of active power in photovoltaic power station is proposed. Based on this, the principle of active power control in PV power plant cluster with multiple time scales is put forward. The functions and control objectives of each layer control structure are analyzed. (3) the photovoltaic power stations in the cluster are classified into three categories according to the operation state and controllable ability. According to the active power regulation target of dispatching, according to the two different scheduling arrangements of increasing power and reducing power, different sequences of photovoltaic power station are established. Then two power allocation methods are proposed to distribute the active power. One is the method of proportional distribution under the condition of limited output, which is simple and feasible, and the other is the method of economic optimization under the condition of limited output, which is calculated by genetic algorithm. Finally, the feasibility of the control strategy is verified by comparing and analyzing the two schemes.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM615
[Abstract]:Photovoltaic power generation has the characteristics of intermittent and volatility, large-scale photovoltaic grid will affect the stability of the grid. In order to improve the controllable ability of photovoltaic, the idea of photovoltaic cluster is put forward in this paper, which makes use of the complementary ability of illumination in the region, so as to improve the accepting ability of the grid to photovoltaic, and realize the control of photovoltaic "like conventional energy". This paper has some theoretical significance and application value. The main contents of this paper are as follows: (1) study the basic characteristics and principles of photovoltaic cells, establish photovoltaic cell model, establish photovoltaic power plant engineering model. Then the maximum power tracking method based on disturbance observation method is studied. The feasibility of the method is verified by MATLAB simulation. The photovoltaic model is simulated. (2) the influence of the photovoltaic power station on the power grid after large-scale connection is studied, and the influence of the fluctuation of the output force of the photovoltaic power station on the frequency of the system is analyzed. Then, the principle of active power control in photovoltaic power plant is studied, and the hierarchical control structure of active power in photovoltaic power station is proposed. Based on this, the principle of active power control in PV power plant cluster with multiple time scales is put forward. The functions and control objectives of each layer control structure are analyzed. (3) the photovoltaic power stations in the cluster are classified into three categories according to the operation state and controllable ability. According to the active power regulation target of dispatching, according to the two different scheduling arrangements of increasing power and reducing power, different sequences of photovoltaic power station are established. Then two power allocation methods are proposed to distribute the active power. One is the method of proportional distribution under the condition of limited output, which is simple and feasible, and the other is the method of economic optimization under the condition of limited output, which is calculated by genetic algorithm. Finally, the feasibility of the control strategy is verified by comparing and analyzing the two schemes.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM615
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