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.

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.

The Locating and Sizing of Distribution Generation Based on the Distribution Network

2014 ◽  
Vol 590 ◽  
pp. 521-525
Author(s):  
Xiao Qian Lu ◽  
Ying Nan Xue ◽  
Xiao Dong Mi ◽  
Xin Hui Du
Keyword(s):  
Power Supply ◽  
Power Distribution ◽  
Distribution Network ◽  
National Policy ◽  
Pso Algorithm ◽  
System Capacity ◽  
Maintenance Cost ◽  
Housing Estate ◽  
Distributed Power ◽  
The Impact

According to the national policy of energy conservation and emissions reduction, using renewable resources and new energy to reduce environmental pollution. Reforming power distribution network system for housing estate in taiyuan. Access to distributed power supply, researching the exact location and capacity. By analyzing the distributed generation of the impact of distribution network,the objective function including investment and operating maintenance cost, environmental factors, network loss costs; putting power flow , current, voltage, system capacity constraints as constraint conditions, Using particle swarm optimization (PSO) algorithm with inertia weight, determine the location and capacity of distributed power supply. The proposed method is testified on the IEEE-33 bus system,and get the reasonable installation position and capacity, the simulation results will be used in transformation housing estate in taiyuan.

scholarly journals The Research of Short-circuit Calculation and Optimization of Contain Distributed Power Distribution Network

2019 ◽  
Vol 260 ◽  
pp. 01005
Author(s):  
Haiyang Yu ◽  
Guangxin Zu ◽  
Meilun Zhang ◽  
Zhipeng Liu ◽  
Guoliang Wu ◽  
...  
Keyword(s):  
Power Distribution ◽  
Optimization Design ◽  
Short Circuit ◽  
Power Grid ◽  
Rapid Development ◽  
Distribution Network ◽  
Power Industry ◽  
Power Distribution Network ◽  
Distributed Power ◽  
Short Circuit Calculation

Electric power industry as an indispensable energy supply in daily life and production, which is the main motive force of equipment operation in the industrial times. Therefore, in order to meet the development needs and ensure the safety of power supply, it is necessary to optimize and transform the power grid. So that energy conservation and security of supply and demand can be ensured. In this paper, the short-circuit calculation and optimization design of distributed power distribution network are studied deeply, aiming at improving the performance of power grid and promoting the rapid development and transformation of power industry.

scholarly journals Characteristic Analysis and Indexing of Multimachine Transient Stabilization Using Virtual Synchronous Generator Control

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 366
Author(s):  
Yuko Hirase ◽  
Kazusa Uezaki ◽  
Dai Orihara ◽  
Hiroshi Kikusato ◽  
Jun Hashimoto
Keyword(s):  
Power Supply ◽  
Synchronous Generator ◽  
Power Supplies ◽  
Characteristic Analysis ◽  
Transient Time ◽  
Power Sources ◽  
Distributed Power ◽  
Grid Connected Inverter ◽  
System Frequency ◽  
Virtual Synchronous Generator

As distributed power sources via grid-connected inverters equipped with functions to support system stabilization are being rapidly introduced, individual systems are becoming more complex, making the quantification and evaluation of the stabilizing functions difficult. Therefore, to introduce distributed power sources and achieve stable system operation, a system should be reduced to a necessary but sufficient size in order to enable the quantification of its behavior supported by transient theory. In this study, a system in which multiple distributed power supplies equipped with virtual synchronous generator control are connected is contracted to a two-machine system: a main power supply and all other power supplies. The mechanical torque of each power supply is mathematically decomposed into inertia, damping, synchronization torques, and the governor effect. The system frequency deviations determined by these elements are quantitatively indexed using MATLAB/Simulink. The quantification index displayed in three-dimensioned graphs illustrates the relationships between the various equipment constants of the main power supply, the control variables of the grid-connected inverter control, and the transient time series. Moreover, a stability analysis is performed in both the time and frequency domains.

scholarly journals Research on Switching Model of Microgrid with Distributed Power Supply

2018 ◽  
Vol 57 ◽  
pp. 03008
Author(s):  
Liu Meiyin ◽  
Lv Zhenhua ◽  
Wu Beibei ◽  
Guo Chongyang ◽  
Han Pingping
Keyword(s):  
Power Supply ◽  
Power Distribution ◽  
Distribution Network ◽  
Great Influence ◽  
Power Converter ◽  
Source Modeling ◽  
Distributed Power ◽  
Hybrid Microgrid ◽  
Pv Inverter ◽  
Smooth Switching

The hybrid microgrid with distributed power supply which includes wind turbine (WT), photovoltaic (PV) inverter and power converter system (PCS), not only could be connected to the power distribution network, but also can operate independently. It is realized switch from grid-connected mode to off-grid mode through the microgrid controller. Whether the microgrid can achieve smooth switching from grid-connected to off-grid has great influence on the safety and stability of the power grid. In order to accurately evaluate the influence of the microgrid switch to the distribution network, it is needed to research on the distributed source modeling technology, and establish an accurate microgrid model. In this paper, using a 400V voltage grade microgrid system with PV, WT and PCS as an example, model the internal equipment and the microgrid control system, and establish a microgrid model for simulation. At the meantime, it carries out the microgrid switch testing, and compare with the measured waveform to verify the accuracy of the model. It is confirmed the accuracy of the microgrid model by the contrast result.

Protection Coordination of 33/11 kV Power Distribution Substation in Iraq

2021 ◽  
Vol 39 (5A) ◽  
pp. 723-737
Author(s):  
Yamur M. Obied ◽  
Thamir M. Abdul Wahhab
Keyword(s):  
Time Delay ◽  
Power System ◽  
Power Distribution ◽  
Software Package ◽  
Short Circuit ◽  
Distribution Network ◽  
Circuit Breaker ◽  
Short Circuit Current ◽  
Earth Fault ◽  
Current Characteristics

The coordination between protective devices is the process of determining the most appropriate timing of power interruption during abnormal conditions in the power system. The aim of this work is to coordinate the protection of the 33/11 kV power distribution substation in Iraq using the CYME 7.1 software package. In this paper overcurrent and earth fault relays are simulated in two cases, with time delay setting and instantaneous setting, to obtain the Time Current Characteristics (TCC) curves for each Circuit Breaker (CB) relay of Al-Karama substation (2×31.5 MVA, 33/11 kV) in Babil distribution network. The short circuit current at each CB is calculated and accordingly, the protection coordination for Al-Karama substation has been simulated. The TCC curves have been obtained in two cases for overcurrent and earth fault relays; in a case with time delay setting and in the case with the instantaneous setting. The setting takes into consideration the short circuit current at the furthest point of the longest outgoing feeder and the shortest outgoing feeder.

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.

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