scholarly journals Analysis and summary of the influence of distributed power supply access on relay protection of distribution network

2019 ◽  
Vol 677 ◽  
pp. 042040
Author(s):  
Rui Miao ◽  
Guoqing Zhang ◽  
Hongbo Li ◽  
Guizhong Wang ◽  
Yingwei Hou ◽  
...  
Keyword(s):  
Power Supply ◽  
Distribution Network ◽  
Relay Protection ◽  
Distributed Power

Influence of distributed power supply in distributed power distribution network

2021 ◽  
pp. 1-8
Author(s):  
Xin Shen ◽  
Hongchun Shu ◽  
Min Cao ◽  
Nan Pan ◽  
Junbin Qian
Keyword(s):  
Power Supply ◽  
Power Distribution ◽  
Short Circuit ◽  
Power Grid ◽  
Distribution Network ◽  
Distribution Networks ◽  
Power Supplies ◽  
Power Distribution Network ◽  
Power Sources ◽  
Distributed Power

In distribution networks with distributed power supplies, distributed power supplies can also be used as backup power sources to support the grid. If a distribution network contains multiple distributed power sources, the distribution network becomes a complex power grid with multiple power supplies. When a short-circuit fault occurs at a certain point on the power distribution network, the size, direction and duration of the short-circuit current are no longer single due to the existence of distributed power, and will vary with the location and capacity of the distributed power supply system. The change, in turn, affects the current in the grid, resulting in the generation and propagation of additional current. This power grid of power electronics will cause problems such as excessive standard mis-operation, abnormal heating of the converter and component burnout, and communication system failure. It is of great and practical significance to study the influence of distributed power in distributed power distribution networks.

scholarly journals A comprehensive evaluation method for the security situation of distributed power supply in distribution network

2021 ◽  
Vol 236 ◽  
pp. 01024
Author(s):  
Bo Wu
Keyword(s):  
Power Supply ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Distribution Network ◽  
Entropy Weight ◽  
Analytic Hierarchy ◽  
Chi Square ◽  
Distributed Power ◽  
Assessment Index ◽  
Comprehensive Evaluation Method

In order to study the influence of distributed power access on the security state of distribution network, a comprehensive evaluation method for the security state of distribution network including distributed power access was proposed.Based on the output model and load model of photovoltaic power supply, the security situation assessment index system of distributed power supply access distribution network is established. Then combined with fuzzy analytic hierarchy process and entropy weight method, the composite weight of each index is obtained, and the combined weight is optimized based on chi-square distance. Finally, the evaluation method based on ER algorithm (Evidential Reasoning) is proposed. Simulation results verify the effectiveness and accuracy of the proposed method.

scholarly journals Reliability Analysis of Distribution Network with Distributed Power Supply

2020 ◽  
Vol 1518 ◽  
pp. 012010
Author(s):  
Shenghui Li ◽  
Xue Bai ◽  
Xiaotong Zhang ◽  
Cailian Gu ◽  
Zixuan Chen
Keyword(s):  
Reliability Analysis ◽  
Power Supply ◽  
Distribution Network ◽  
Distributed Power

scholarly journals Study on Voltage Characteristics of Distributed Power Supply Connected to Distribution Network

2019 ◽  
Vol 7 (4) ◽  
pp. 99-104
Author(s):  
Zetian Zhong ◽  
Hang Zhang ◽  
Jiashu Wang ◽  
Gang Ma ◽  
Wei Qiu ◽  
...  
Keyword(s):  
Power Supply ◽  
Distribution Network ◽  
Distributed Power

scholarly journals Multi-Objective Reactive Power Optimization Including Distributed Generation

2019 ◽  
Vol 11 (1) ◽  
pp. 46-52
Author(s):  
Hong WANG ◽  
Zhijie WANG
Keyword(s):  
Power Supply ◽  
Distribution System ◽  
Reactive Power ◽  
Power Optimization ◽  
Distribution Network ◽  
Constraint Equation ◽  
Reactive Power Optimization ◽  
Multiple Perspectives ◽  
Distributed Power ◽  
Multi Objective

 In order to solve the problem of reactive power optimization of distribution network with distributed power supply, the multi-objective reactive power optimization function is established from multiple perspectives, and the equation constraint and inequality constraint equation of power system are considered. Secondly, taking IEEE33 node distribution system with distributed power supply as an example, reactive power optimization of single objective function is carried out to verify that the proposed algorithm has a global convergence and a great advantage in convergence speed. Finally, multi-objective reactive power optimization of distribution network with distributed power supply is carried out. Simulation results demonstrate the effectiveness of the proposed algorithm.

Relay Protection of Multilevel Differential Distribution Network Based on Feeder Segment Switch

2021 ◽  
Author(s):  
Qingjie Wang
Keyword(s):  
Power Supply ◽  
Fault Location ◽  
Distribution Network ◽  
Relay Protection ◽  
Voltage Source ◽  
Location Error ◽  
Differential Distribution ◽  
Protection Method ◽  
Contact Switch ◽  
The Ideal

Abstract In order to solve the problems existing in the traditional relay protection methods, such as poor relay safety and large fault location error of distribution network, this paper proposes a multilevel differential relay protection method based on feeder segment switch. The configuration principle and the selection principle of multilevel range are determined, and the objective function of multilevel difference distribution network feeder segment switch configuration is set. After considering the target of economic benefit, the main feeder of distribution network is segmented and a contact switch is set at the end of the feeder. The equivalent topology of multilevel differential distribution network is analyzed to make the power supply at the first end of the line connected with the substation, which is regarded as the ideal voltage source. Considering the jurisdiction index of the switch, greedy algorithm is adopted to optimize the switch configuration of feeder segment. This paper analyzes the protection misoperation of multilevel differential distribution network and the sensitivity of feeder segment switch to realize the relay protection of multilevel differential distribution network. The experimental results show that the proposed method has higher safety and lower fault location accuracy, and is feasible to some extent.

Issue of Distributed Power Supply Is Introduced into Distribution Network

2015 ◽  
Vol 734 ◽  
pp. 736-739
Author(s):  
Zhi Qiang Du
Keyword(s):  
Network Security ◽  
Power Quality ◽  
Power Supply ◽  
Distribution Network ◽  
Power Source ◽  
Distributed Power ◽  
The Impact

This article through to the tianjin area distributed power source development situation investigation, this paper introduces the concept of distributed power supply, this paper expounds the types and characteristics of distributed power supply, analyzes the distributed power supply stability, access to distribution network security protection, power quality, reliability, the influence of the impact puts forward the main technical key.

scholarly journals Adaptive Current Protection Technology for Distribution Network with Distributed Power Sources Based on Local Information

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Shijie Cui ◽  
Peng Zeng ◽  
Zhongfeng Wang ◽  
Yue Zuo
Keyword(s):  
Power Supply ◽  
Power Distribution ◽  
Negative Impact ◽  
Short Circuit ◽  
Distribution Network ◽  
Local Information ◽  
Power Supplies ◽  
Power Sources ◽  
Distributed Power ◽  
Protection Technology

Because the distributed power supply is connected to the distribution network, its structure has also changed the original traditional method. The original single power supply method was originally used. The network provided is a radial network and it is connected to the distributed power supply. Later, it became a structure with small- and medium-sized power supplies inside, and its network power supply became dual or multiple power supplies. Such a structural change affected the coordination of power distribution protection devices, which would impose current on the distribution network. Protection has a negative impact. This paper aims to study the adaptive current protection technology of distribution network with distributed power based on local information. On the basis of analyzing the characteristics of distributed power, the classification of distributed power, and the operation mode of distributed power, according to the access of IIDG, as well as different influences of relay protection of distribution network, an improved protection scheme with adaptive current quick-break protection as the main protection is proposed, so that different fault characteristics of the distribution network have different setting values, and then simulation experiments are carried out on this scheme. The experimental results show that the setting value of three-phase short-circuit fault proposed in this paper can well protect the protection range, which is larger than the traditional protection setting and self-adaptive setting.

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