配电网分布式光伏准入容量计算

发布时间：2018-06-12 22:16

本文选题：配电网 + 分布式光伏　；参考：《西安科技大学》2017年硕士论文

【摘要】：光伏分布式接入配电网无论是通过主动配电网技术或是微电网技术,准入容量都是配电网侧必须考虑的问题。《太阳能发展“十三五”规划》提出单个村级电站不超过300kW。但我国幅员辽阔,区域差异大,如何配制分布式光伏准入容量,以保证充分利用太阳能资源和配电网资源显得尤为重要。本文采用最优化的方法计算分布式光伏准入容量,并从电网运行角度对现有的约束条件进行了归类。提出一种基于矩阵描述的准入容量计算方案。该方案以电压降落为约束、以配电网分布式光伏准入容量之和最大为目标函数、以遗传算法为计算工具。提出了用点间矩阵来描述节点之间的关系,并通过点间矩阵得出矩阵形式的电压降落约束。从灵敏度的角度分析出在电阻不可忽略的低压配电网中,有功功率的变化对电压降落的变化起主要作用,进而在电压降落计算时略去了无功功率。使用电压降落约束替换潮流约束,避免了潮流迭代计算,并推导了电压降落约束与潮流约束之间的等价性。针对分布式光伏的无区域分布约束、按距离均匀分布、按节点均匀分布三种情景,将准入容量计算方案应用于典型配电网,得到各个节点的分布式光伏准入容量值,并对计算结果进行仿真验证。仿真中,在加入计算值大小的分布式光伏后,各节点电压满足电压降落约束,这证明了准入容量计算方案的可行性。基于计算结果分析出对分布式光伏准入容量限定的一般性原则。并利用潮流的力矩法对总结出的分布式光伏准入容量限定的一般性原则进行了证明。
[Abstract]:Whether through active distribution network technology or microgrid technology, the access capacity of photovoltaic distributed distribution network must be considered by the distribution network side. In the 13th Five-Year Plan of Solar Energy Development, it is proposed that the single village level power station should not exceed 300kW. However, China has a vast territory and large regional differences, so it is particularly important to prepare distributed photovoltaic access capacity to ensure the full use of solar energy resources and distribution network resources. In this paper, the optimal method is used to calculate the access capacity of distributed photovoltaic system, and the existing constraints are classified from the point of view of grid operation. In this paper, a method of calculating access capacity based on matrix description is proposed. This scheme takes the voltage drop as the constraint, takes the maximum of the distributed photovoltaic access capacity as the objective function, and takes the genetic algorithm as the calculation tool. The relationship between nodes is described by the matrix between points, and the voltage drop constraints in the form of the matrix are obtained by the matrix between the points. From the point of view of sensitivity, it is analyzed that the change of active power plays a major role in the variation of voltage drop in the low-voltage distribution network where resistance cannot be ignored, and then the reactive power is omitted in the calculation of voltage drop. Instead of power flow constraints, voltage drop constraints are used to avoid power flow iterative calculation, and the equivalence between voltage drop constraints and power flow constraints is derived. Aiming at three scenarios of distributed photovoltaic (DPV), which are distributed evenly according to distance and nodes, the access capacity calculation scheme is applied to typical distribution network, and the value of distributed photovoltaic admission capacity of each node is obtained. The results are verified by simulation. In the simulation, the voltage of each node satisfies the voltage drop constraint after adding the distributed photovoltaic with the calculated value, which proves the feasibility of the scheme to calculate the admission capacity. Based on the calculation results, the general principle of limiting the access capacity of distributed photovoltaic is analyzed. The general principle of limiting the access capacity of distributed photovoltaic is proved by the torque method of power flow.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM615

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