考虑电能质量问题的分布式光伏接入规划方法
发布时间：2019-05-28 19:23
【摘要】：随着智能电网技术的迅速发展,越来越多的新能源或节能低耗的分布式发电设备(DG)接入配电网,其中分布式光伏电源因其本身受太阳辐射强度的影响,具有随机性和波动性,接入后会改变系统的原拓扑结构和潮流,并对电网的电能质量产生影响。随着分布式光伏发电在配电网中的渗透率不断上升,对配电网的电能质量影响严重时会对电网的安全经济运行构成威胁。因此在含分布式光伏的电网规划阶段计及电能质量评估是必要的。本文首先理论分析了分布式光伏接入对电网的电压偏差、电压波动、谐波及三相不平衡度的影响,并以IEEE-33节点为例仿真验证;接着介绍了一种基于数据包络分析的电能质量综合评估方法,用该方法评估分布式光伏接入点的电能质量,并与其他综合评估方法的评估结果对比,验证了数据包络分析评估方法的有效性;然后提出了一种基于改进粒子群优化算法的分布式光伏电源的优化配置方法:以分布式光伏的接入容量最大为目标函数,采用改进粒子群优化算法进行计算,得到分布式光伏电源的接入位置和容量,并以IEEE-33节点为例验证所提方法的有效性。在确认基于改进粒子群算法的分布式光伏电源的优化配置方法和数据包络分析综合评估方法的有效性基础上,本文提出了一种考虑电能质量约束的分布式光伏接入规划方法。该方法首先对待规划地区进行潮流分析计算,根据待规划地区的光伏发展需求,选择电能质量达标的可接入点,确定可接入点的集合,同时用灰色-马尔科夫链预测模型预测待规划地区的光伏电源出力;接着,利用改进的粒子群算法求解考虑电能质量约束的光伏电源优化配置模型,得到光伏电源接入配网的接入点和接入容量;最后用数据包络分析(DEA)的电能质量评估方法对接入方案中的各接入点进行电能质量评估,如果接入方案中有接入点的电能质量评估指标不合格,则给出修正方案,最后给出电能质量水平良好的分布式光伏电源接入的规划方案。本文以某地一实际10kV线路和IEEE-33节点三相不平衡系统为例,对三相平衡和三相不平衡的情况分别进行仿真计算,验证了本文规划方法的可行性。
[Abstract]:With the rapid development of smart grid technology, more and more new energy or energy-saving and low-consumption distributed power generation equipment (DG) are connected to distribution network, in which distributed photovoltaic power supply is affected by solar radiation intensity. With randomness and volatility, the original topological structure and power flow of the system will be changed after access, and the power quality of the power grid will be affected. With the increasing permeability of distributed photovoltaic power generation in distribution network, it will pose a threat to the safe and economic operation of power network when it has a serious impact on the power quality of distribution network. Therefore, it is necessary to consider power quality assessment in the power grid planning stage with distributed photovoltaic. In this paper, the effects of distributed photovoltaic access on voltage deviation, voltage fluctuation, harmonics and three-phase imbalance of power grid are analyzed theoretically, and the IEEE-33 node is taken as an example to verify the voltage deviation, voltage fluctuation, harmonics and three-phase imbalance. Then, a comprehensive power quality evaluation method based on data envelopment analysis (DEA) is introduced, which is used to evaluate the power quality of distributed photovoltaic access points, and the results are compared with those of other comprehensive evaluation methods. The effectiveness of the data envelopment analysis (DEA) evaluation method is verified. Then an optimal configuration method of distributed photovoltaic power supply based on improved particle swarm optimization algorithm is proposed: taking the maximum access capacity of distributed photovoltaic as the objective function, the improved particle swarm optimization algorithm is used to calculate. The access location and capacity of distributed photovoltaic power supply are obtained, and the effectiveness of the proposed method is verified by taking IEEE-33 node as an example. On the basis of confirming the effectiveness of the optimal configuration method and data envelopment analysis comprehensive evaluation method of distributed photovoltaic power supply based on improved particle swarm optimization algorithm, a distributed photovoltaic access planning method considering power quality constraints is proposed in this paper. The method first carries on the power flow analysis and calculation to the planned area, according to the photovoltaic development demand of the planned area, selects the access point which the power quality meets the standard, and determines the set of the access point. At the same time, the grey Markov chain prediction model is used to predict the output of photovoltaic power supply in the area to be planned. Then, the improved particle swarm optimization algorithm is used to solve the optimal configuration model of photovoltaic power supply considering power quality constraints, and the access point and access capacity of photovoltaic power supply access network are obtained. Finally, the power quality evaluation method of data envelopment analysis (DEA) is used to evaluate the power quality of each access point in the access scheme. If the power quality evaluation index of the access point in the access scheme is not up to standard, the correction scheme is given. Finally, the planning scheme of distributed photovoltaic power supply access with good power quality level is given. In this paper, taking a practical 10kV line and IEEE-33 node three-phase unbalanced system as examples, the simulation calculation of three-phase equilibrium and three-phase imbalance is carried out respectively, which verifies the feasibility of the planning method in this paper.
【学位授予单位】：武汉大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM615;TM715
[Abstract]:With the rapid development of smart grid technology, more and more new energy or energy-saving and low-consumption distributed power generation equipment (DG) are connected to distribution network, in which distributed photovoltaic power supply is affected by solar radiation intensity. With randomness and volatility, the original topological structure and power flow of the system will be changed after access, and the power quality of the power grid will be affected. With the increasing permeability of distributed photovoltaic power generation in distribution network, it will pose a threat to the safe and economic operation of power network when it has a serious impact on the power quality of distribution network. Therefore, it is necessary to consider power quality assessment in the power grid planning stage with distributed photovoltaic. In this paper, the effects of distributed photovoltaic access on voltage deviation, voltage fluctuation, harmonics and three-phase imbalance of power grid are analyzed theoretically, and the IEEE-33 node is taken as an example to verify the voltage deviation, voltage fluctuation, harmonics and three-phase imbalance. Then, a comprehensive power quality evaluation method based on data envelopment analysis (DEA) is introduced, which is used to evaluate the power quality of distributed photovoltaic access points, and the results are compared with those of other comprehensive evaluation methods. The effectiveness of the data envelopment analysis (DEA) evaluation method is verified. Then an optimal configuration method of distributed photovoltaic power supply based on improved particle swarm optimization algorithm is proposed: taking the maximum access capacity of distributed photovoltaic as the objective function, the improved particle swarm optimization algorithm is used to calculate. The access location and capacity of distributed photovoltaic power supply are obtained, and the effectiveness of the proposed method is verified by taking IEEE-33 node as an example. On the basis of confirming the effectiveness of the optimal configuration method and data envelopment analysis comprehensive evaluation method of distributed photovoltaic power supply based on improved particle swarm optimization algorithm, a distributed photovoltaic access planning method considering power quality constraints is proposed in this paper. The method first carries on the power flow analysis and calculation to the planned area, according to the photovoltaic development demand of the planned area, selects the access point which the power quality meets the standard, and determines the set of the access point. At the same time, the grey Markov chain prediction model is used to predict the output of photovoltaic power supply in the area to be planned. Then, the improved particle swarm optimization algorithm is used to solve the optimal configuration model of photovoltaic power supply considering power quality constraints, and the access point and access capacity of photovoltaic power supply access network are obtained. Finally, the power quality evaluation method of data envelopment analysis (DEA) is used to evaluate the power quality of each access point in the access scheme. If the power quality evaluation index of the access point in the access scheme is not up to standard, the correction scheme is given. Finally, the planning scheme of distributed photovoltaic power supply access with good power quality level is given. In this paper, taking a practical 10kV line and IEEE-33 node three-phase unbalanced system as examples, the simulation calculation of three-phase equilibrium and three-phase imbalance is carried out respectively, which verifies the feasibility of the planning method in this paper.
【学位授予单位】：武汉大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM615;TM715
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