配电网中分布式电源选址与定容问题的研究

发布时间：2019-03-27 11:57

【摘要】：国民经济的发展，电力的需求量也越来越大。为了应对日益增长的用电量，一方面要增加装机容量，另外一方面要节约电能。传统的发电方式会产生大量污染物，并且不经济。分布式电源多使用清洁能源，对环境友好，同时又是可再生能源。分布电源接入配电网后，会对配电网的潮流、继电保护等方面造成影响。合理的规划分布式电源的接入点和接入容量，会减小对配电网保护的冲击，并且能够降低系统网损，改善电压水平，增强配电网的可靠性。因此，本文研究分布式电源接入配电网后的选址与定容问题。论文在阐述各种分布式电源出力特性、控制特性及优缺点等的基础上，分析了分布式电源对配电网潮流、电压水平、保护、稳态电压分布等的影响。以分布式电源运行费用和网损费用之和最小为目标，以电压约束条、功率约束条件、潮流约束、分布式电源容量约束条件等为约束条件，建立数学模型，采用惩罚函数处理约束条件，利用遗传算法对所建立的模型进行求解，采用自适应的交叉率和变异率，对遗传算法采用精英策略进行改进。利用Matlab软件进行编程计算，分析计算了六种不同的分布式电源组合接入配电网的接入点和接入容量，表明了算法的有效性，，证明了分布式电源的接入点和接入容量不同会对配电网造成影响，不同分布式电源组合，其最佳接入点、接入容量以及接入配电网后的经济性也不同。利用本文提出的方法，编制了基于VC6.0的分布式电源选址与定容辅助决策软件，通过本软件能方便地确定分布式电源的接入点和接入容量。
[Abstract]:With the development of the national economy, the demand for electricity is also increasing. In order to cope with the increasing electricity consumption, the installed capacity is increased on the one hand, and the electric energy is saved on the other hand. The traditional way of power generation produces a large amount of pollutants and is not economical. The distributed power supply uses clean energy, is environment-friendly, and is also a renewable energy source. After the distributed power supply is connected to the distribution network, the power flow, relay protection and other aspects of the distribution network are affected. The reasonable planning of the access point and the access capacity of the distributed power supply can reduce the impact on the protection of the distribution network, and can reduce the loss of the system network, improve the voltage level and enhance the reliability of the distribution network. Therefore, this paper studies the location and constant volume of distributed power supply in the distribution network. In this paper, the power flow, voltage level, protection and steady-state voltage distribution of the distribution network are analyzed on the basis of describing the output characteristics, control characteristics and advantages and disadvantages of the distributed power supply. In response to that sum of the operating cost and the network loss cost of the distributed power supply, a mathematical model is set up by using the constraint of voltage constraint, power constraint condition, power flow constraint and distributed power supply capacity constraint condition, and the constraint bar is treated with a penalty function. In this paper, a genetic algorithm is used to solve the established model, and the self-adaptive cross-rate and variation rate are used to correct the genetic algorithm with the elite strategy. In this paper, the access point and the access capacity of six different distributed power distribution networks are calculated and calculated by using the Matlab software. The effectiveness of the algorithm is shown. It is proved that the access point and the access capacity of the distributed power supply can cause shadow to the distribution network. in response to that combination of different distributed pow sources, the optimal access point, the access capacity, and the economy after access to the distribution network are not By using the method proposed in this paper, a distributed power supply location and constant volume auxiliary decision-making software based on V6.0 is developed, and the access point and the access capacity of the distributed power source can be easily determined by the software.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM715

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