含分布式电源的配电网继电保护研究
发布时间：2019-03-08 15:43
【摘要】：近年来,分布式电源(Distributed Generation,DG)因其消纳新能源的方式最为友好而得到了快速的发展。但是,随着DG的接入,配电网原有的单辐射供电网络会转变为双端或多端供电型,短路电流大小、方向均发生变化,使配电网原有的继电保护装置可能出现拒动、误动等问题,特别是当大规模DG接入时,这种影响将更加明显。本文从尽可能少的改变原有配电网继电保护配置出发,提出了一套完整的包括主保护与后备保护的配电网保护方案。首先针对应用最为广泛的含逆变的分布式电源(Inverter Interfaced Distributed Generation,IIDG)根据其控制方式及配电网故障时IIDG的输出特性,建立了数学模型。在两相短路时将其等效为受母线正序电压控制电流源,在三相短路时将其等效为受母线电压控制的电流源。其次,从IIDG的接入容量与故障点发生在IIDG接入点的不同位置两方面出发,理论定性地分析了IIDG接入后对原有配电网继电保护以及自动重合闸的影响;随后通过仿真软件MATLAB/Simulink搭建了含IIDG的10KV典型辐射型配电网仿真模型,仿真分析了IIDG接入对原有配电网继电保护的影响。再次,根据IIDG的接入对配电网继电保护产生的不同影响,提出一种改进的自适应电流速断保护为主保护的保护方案,使配电网不同的故障特性有不同的整定值。当故障发生在IIDG下游时,引入负荷电流对保护的影响,提高了两相短路的灵敏度。当故障发生在IIDG上游时,根据两相短路故障和三相短路故障时保护安装处的正序电压与流过该保护安装处的正序电流之间的关系,改变已有的自适应电流保护的整定公式中的某些参数,使其整定计算更准确。最后提出将基于功率平衡的广域保护作为后备保护引入含IIDG的配电网中,根据IIDG容量和负荷大小预测对含IIDG的配电网区域进行划分,通过信息交换实现故障区域定位及IIDG的孤岛运行。
[Abstract]:In recent years, distributed Power supply (Distributed Generation,DG) has been developed rapidly because of its friendliest way to absorb new energy. However, with the access of DG, the original single radiation power supply network of distribution network will be transformed into double-or multi-terminal power supply type, the size and direction of short-circuit current will change, and the original relay protection device of distribution network may appear some problems such as failure to operate, misoperation, and so on. Especially when large-scale DG access, the impact will be more obvious. In order to change the relay protection configuration of distribution network as little as possible, a set of complete protection scheme including main protection and backup protection is proposed in this paper. Firstly, a mathematical model is established for the most widely used distributed power supply, (Inverter Interfaced Distributed Generation,IIDG (distributed Power supply), according to its control mode and the output characteristics of IIDG when the distribution network fails. The two-phase short circuit is equivalent to the current source controlled by the bus positive sequence voltage, and the three-phase short circuit is equivalent to the current source controlled by the bus voltage. Secondly, starting from the two aspects of IIDG access capacity and failure point occurring in different locations of IIDG access point, the influence of IIDG access on the relay protection and automatic reclosing of the original distribution network is analyzed theoretically and qualitatively. Then the simulation model of the typical radiative distribution network of 10KV with IIDG is built by the simulation software MATLAB/Simulink. The influence of IIDG access on the relay protection of the original distribution network is simulated and analyzed. Thirdly, according to the different effects of IIDG access on relay protection of distribution network, an improved adaptive current quick-break protection scheme is proposed, which makes different fault characteristics of distribution network have different setting values. When the fault occurs downstream of IIDG, the influence of load current on protection is introduced, and the sensitivity of two-phase short circuit is improved. When the fault occurs upstream of the IIDG, the relationship between the positive sequence voltage at the protection installation and the positive sequence current flowing through the protection installation is based on the relationship between the two-phase short-circuit fault and the three-phase short-circuit fault. Some parameters in the existing setting formula of adaptive current protection are changed to make the setting calculation more accurate. Finally, the wide area protection based on power balance is introduced into the distribution network with IIDG as backup protection. According to the capacity and load forecast of IIDG, the distribution network area with IIDG is divided. The location of fault area and the island operation of IIDG are realized through information exchange.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM77
本文编号：2436952
[Abstract]:In recent years, distributed Power supply (Distributed Generation,DG) has been developed rapidly because of its friendliest way to absorb new energy. However, with the access of DG, the original single radiation power supply network of distribution network will be transformed into double-or multi-terminal power supply type, the size and direction of short-circuit current will change, and the original relay protection device of distribution network may appear some problems such as failure to operate, misoperation, and so on. Especially when large-scale DG access, the impact will be more obvious. In order to change the relay protection configuration of distribution network as little as possible, a set of complete protection scheme including main protection and backup protection is proposed in this paper. Firstly, a mathematical model is established for the most widely used distributed power supply, (Inverter Interfaced Distributed Generation,IIDG (distributed Power supply), according to its control mode and the output characteristics of IIDG when the distribution network fails. The two-phase short circuit is equivalent to the current source controlled by the bus positive sequence voltage, and the three-phase short circuit is equivalent to the current source controlled by the bus voltage. Secondly, starting from the two aspects of IIDG access capacity and failure point occurring in different locations of IIDG access point, the influence of IIDG access on the relay protection and automatic reclosing of the original distribution network is analyzed theoretically and qualitatively. Then the simulation model of the typical radiative distribution network of 10KV with IIDG is built by the simulation software MATLAB/Simulink. The influence of IIDG access on the relay protection of the original distribution network is simulated and analyzed. Thirdly, according to the different effects of IIDG access on relay protection of distribution network, an improved adaptive current quick-break protection scheme is proposed, which makes different fault characteristics of distribution network have different setting values. When the fault occurs downstream of IIDG, the influence of load current on protection is introduced, and the sensitivity of two-phase short circuit is improved. When the fault occurs upstream of the IIDG, the relationship between the positive sequence voltage at the protection installation and the positive sequence current flowing through the protection installation is based on the relationship between the two-phase short-circuit fault and the three-phase short-circuit fault. Some parameters in the existing setting formula of adaptive current protection are changed to make the setting calculation more accurate. Finally, the wide area protection based on power balance is introduced into the distribution network with IIDG as backup protection. According to the capacity and load forecast of IIDG, the distribution network area with IIDG is divided. The location of fault area and the island operation of IIDG are realized through information exchange.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM77
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