scholarly journals Integrated Power Flow and Short Circuit Calculation Method for Distribution Network with Inverter Based Distributed Generation

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Shan Yang ◽  
Xiangqian Tong
Keyword(s):  
Distributed Generation ◽  
Calculation Method ◽  
Power Flow ◽  
Low Voltage ◽  
Short Circuit ◽  
Distribution Network ◽  
Short Circuit Current ◽  
Theoretical Research ◽  
Equivalent Model ◽  
Short Circuit Calculation

Power flow calculation and short circuit calculation are the basis of theoretical research for distribution network with inverter based distributed generation. The similarity of equivalent model for inverter based distributed generation during normal and fault conditions of distribution network and the differences between power flow and short circuit calculation are analyzed in this paper. Then an integrated power flow and short circuit calculation method for distribution network with inverter based distributed generation is proposed. The proposed method let the inverter based distributed generation be equivalent toIθbus, which makes it suitable to calculate the power flow of distribution network with a current limited inverter based distributed generation. And the low voltage ride through capability of inverter based distributed generation can be considered as well in this paper. Finally, some tests of power flow and short circuit current calculation are performed on a 33-bus distribution network. The calculated results from the proposed method in this paper are contrasted with those by the traditional method and the simulation method, whose results have verified the effectiveness of the integrated method suggested in this paper.

The Application of Electronic Communication Relay Protection in Distribution Network with Distributed Generation

2014 ◽  
Vol 1070-1072 ◽  
pp. 938-942 ◽  
Author(s):  
Shu Zheng ◽  
Zhi Hua Xu ◽  
Jia Jia Liu ◽  
Qiang Fu
Keyword(s):  
Distributed Generation ◽  
Power Flow ◽  
Electronic Communication ◽  
Flow Direction ◽  
Short Circuit ◽  
Distribution Network ◽  
Relay Protection ◽  
Short Circuit Current ◽  
Distributed Network ◽  
The Stability

A new relay protection based on electronic communication is presented for the access of distributed generation. After distributed generation access to the system, distribution network power flow direction and short-circuit current level will change. This paper describes the effects of distributed generation on distributed network by building feeder system simplified PSCAD/ EMTDC model. According to the analysis, the new relay protection can improve the stability and reliability of distributed network.

The Impact of Synchronous Distributed Generation (DG) on Distribution System

2015 ◽  
Vol 785 ◽  
pp. 388-392 ◽  
Author(s):  
Hasmaini Mohamad ◽  
Shahrani Shahbudin ◽  
Nofri Yenita Dahlan
Keyword(s):  
Distributed Generation ◽  
Distribution System ◽  
System Performance ◽  
Power Flow ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Voltage Profile ◽  
Before And After ◽  
Potential Benefits ◽  
The Impact

Interconnection of Distributed Generation (DG) in distribution system presents many potential benefits as well as drawbacks. The impacts of DG might vary with the types of generator. This paper presents a study on the impacts of synchronous DG's interconnection in distribution system. Steady state analysis is carried out to analyze the impact of DG on voltage profile and short circuit current considering before and after DG interconnection. Dynamic analysis is also performed for investigating the performance of DG when a part of distribution system is being islanded. Results show that the penetration of DG contributes to the changes of power flow in the system, hence give impacts to the overall system performance.

Comparative Analysis of the Calculation Results of Online Short-Circuit Current Based on PSASP and Fault Wave Recording

2014 ◽  
Vol 1070-1072 ◽  
pp. 897-901
Author(s):  
Guang Ming Lu ◽  
Wei Zhang ◽  
Jian Feng Yan ◽  
Yong Jun Yu ◽  
Zhi Hong Yu ◽  
...  
Keyword(s):  
Power Flow ◽  
Low Voltage ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Online Data ◽  
Operation Process ◽  
Depth Analysis ◽  
Forward Calculation ◽  
Current Calculation ◽  
Wave Recording

In daily operation process,the results of online short-circuit current calculation and fault wave recording is different, the differences between the two results affected the dispatcher’s decision. In-depth analysis of the calculation process and finding the possible causes of the differences should be done. The on-line PSASP short-circuit current calculation based on power flow and scheme was studied. The boundary conditions and calculation models of two methods were studied, the influence of the modeling scope and equivalent circuits to the short-circuit current was also studied. Fault wave recording calculated short-circuit current through forward calculation, the middle to both sides calculation and backward calculation, and the differences of the three calculation mode were also analyzed. Through the above analysis and comparison, online data equivalent to 220kV high voltage side of the transformer greatly impacts short-circuit current, but effective value calculation method of fault wave recording has a little impact on the short-circuit current, mainly in the following reasons, the first one is that non-dispatching power plant is equivalent to a load, the second one is that several different types of load is equivalent to a load using one load model, the third one is that all devices connecting to low voltage side of the 220kV transformers are equivalent to 220kV. Conclusions of the analysis can provide the basis for the practical work of online short-circuit current calculation.

Analysis of Short-Circuit Calculation in Microgrid with Wind/Solar Micro-Sources Based on IEC STANDARD 60909

2014 ◽  
Vol 1008-1009 ◽  
pp. 155-159
Author(s):  
Xu Ri Song ◽  
Lei Wang ◽  
Lin Ye ◽  
Yu Zou ◽  
Jie Xu ◽  
...  
Keyword(s):  
Control Strategies ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Equivalent Model ◽  
Electric Networks ◽  
Actual System ◽  
Distributed Generators ◽  
Short Circuit Calculation ◽  
The Common ◽  
Operation Characteristics

Microgrid are LV or MV electric networks which utilize various distributed generators (DG) to serve local loads.In this paper an equivalent model of a hybrid system including wind power and solar power generating units has been built based on the mathematical models of wind turbine(WT) and photovoltaic(PV).Control strategies of the converters have been also developed. The short-circuit current and voltage levels of the microgrid have been calculated respectively based on the IEC 60909 standard corresponding to the occurrence of a three-phases short-circuit at the Point of the Common Coupling(PCC). Simulation results verified that the micro sources and microgrid built in this paper can simulate the actual system operation very well, and it can provide a simulation platform for further study of operation characteristics of system-integrated microgrid.

Microgrid Protection Based on Specific Current Injection

2013 ◽  
Vol 805-806 ◽  
pp. 1082-1086
Author(s):  
Jun Li ◽  
Zhi Fei Chen ◽  
Jun Xia Qian ◽  
Hui Gang Zhang
Keyword(s):  
Power Flow ◽  
Short Circuit ◽  
Distribution Network ◽  
Short Circuit Current ◽  
Current Injection ◽  
Harmonic Current ◽  
Matlab Simulink ◽  
Injection Method ◽  
Protection Scheme ◽  
Fault Type

Considering that microgrid (MG) can be controlled flexibly, its short circuit-current is limited and power flow is bidirectional. The paper presents a new relay protection scheme of microgrid based specific harmonic injection method. The injective harmonic flows all over microgrid and the amplitude of specific harmonic current will enhance in fault occasion. So the above characteristic can solve the problem of fault position and the symmetric characteristic can complete the identification of fault type. The discussion about the compatibility of microgrid protection and conventional distribution network line protection. At last, the combined microgrid model is built in Matlab/Simulink environment. The simulation result demonstrated that the above method can complete the identification of fault position and type and it also can coordinate with the traditional line protection well.

scholarly journals Equivalent model of multi-type distributed generators under faults with fast-iterative calculation method based on improved PSO algorithm

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Puyu Wang ◽  
Jinyuan Song ◽  
Fangyu Liang ◽  
Fang Shi ◽  
Xiangping Kong ◽  
...  
Keyword(s):  
Calculation Method ◽  
Low Voltage ◽  
Distribution Network ◽  
Pso Algorithm ◽  
Equivalent Model ◽  
Synchronous Generators ◽  
Fault Calculation ◽  
Distributed Generators ◽  
Current Characteristics ◽  
Integration Strategies

AbstractThere are various types of distributed generators (DGs) with different grid integration strategies. The transient characteristics of the fault currents provided by the DGs are different to those of conventional synchronous generators. In this paper, a distribution network with multi-type DGs is investigated, including consideration of DG low-voltage ride through (LVRT). The fault current characteristics of two typical DGs, i.e. an inverter-interfaced distributed generator (IIDG) and a doubly-fed induction generator (DFIG), are analyzed, considering the specific operation modes. Based on analysis of the fault characteristics, an equivalent model of the multi-type DGs under symmetrical/asymmetrical fault conditions is established. A fast-iterative fault calculation method for enhancing the calculation efficiency while avoiding local convergence is then proposed using an improved particle swarm optimization (PSO) algorithm. A simulation system of the distribution network with multi-type DGs is established in PSCAD/EMTDC. The simulation results validate the high accuracy and calculation efficiency of the proposed calculation method of the fault components. This can assist in the settings of the protection threshold.

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