Adaptive current short-circuit protection in electric systems with distributed generation

2016 ◽  
Author(s):  
N. V. Grebchenko ◽  
D. Y. Osipov ◽  
A.G. Teslya ◽  
J. B. Bozok ◽  
I. I. Koval
Keyword(s):  
Distributed Generation ◽  
Short Circuit

scholarly journals Design and computational modeling of fault current limiter topologies

2020 ◽  
Author(s):  
Alexandre Bitencourt ◽  
Daniel H. N. Dias ◽  
Bruno W. França ◽  
Felipe Sass ◽  
Guilherme G. Sotelo
Keyword(s):  
Electric Power ◽  
Distributed Generation ◽  
Distribution System ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Economic Feasibility ◽  
Fault Current ◽  
Fault Current Limiter ◽  
Fault Current Limiters ◽  
Current Limiter

The increase in demand for electric power and the insertion of a distributed generation led to the rise of the short-circuit current in substations. Most of these Brazilian substations were designed decades ago, because of that their equipment may not support the new short-circuit current levels. To protect the installed equipment and avoid excessive costs replacing old devices, it is possible to install Fault Current Limiters (FCLs). This document is a report from an R&D project that evaluated FCL topologies considering real parameters in simulation from used equipment, concluding that the selected FCL topologies accomplished their technical objective. However, before implementing these topologies in the distribution system, one should consider the technical and economic feasibility of using semiconductor switching devices.

Anti-islanding Protection of Distributed Generation Using Rate of Change of Impedance

2013 ◽  
Vol 14 (5) ◽  
pp. 433-442 ◽  
Author(s):  
Pragnesh Shah ◽  
Bhavesh Bhalja
Keyword(s):  
Distributed Generation ◽  
Distribution System ◽  
Short Circuit ◽  
Rate Of Change ◽  
System Failure ◽  
Switching Event ◽  
Impedance Monitoring ◽  
Personnel Safety ◽  
Utility Network ◽  
Two Phases

Abstract Distributed Generation (DG), which is interlinked with distribution system, has inevitable effect on distribution system. Integrating DG with the utility network demands an anti-islanding scheme to protect the system. Failure to trip islanded generators can lead to problems such as threats to personnel safety, out-of-phase reclosing, and degradation of power quality. In this article, a new method for anti-islanding protection based on impedance monitoring of distribution network is carried out in presence of DG. The impedance measured between two phases is used to derive the rate of change of impedance (dz/dt), and its peak values are used for final trip decision. Test data are generated using PSCAD/EMTDC software package and the performance of the proposed method is evaluated in MatLab software. The simulation results show the effectiveness of the proposed scheme as it is capable to detect islanding condition accurately. Subsequently, it is also observed that the proposed scheme does not mal-operate during other disturbances such as short circuit and switching event.

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.

scholarly journals Effective energy storage power control to extend the acceptable range of generator frequency in distributed generation

2021 ◽  
Vol 288 ◽  
pp. 01006
Author(s):  
Pavel Ilyushin ◽  
Sergey Filippov ◽  
Aleksandr Kulikov
Keyword(s):  
Energy Storage ◽  
Power Control ◽  
Distributed Generation ◽  
Reactive Power ◽  
Control Method ◽  
Short Circuit ◽  
Technical Requirements ◽  
Acceptable Range ◽  
Successful Solution ◽  
Generator Sets

Gas-turbine and gas-piston generator sets (GS) are widely used at distributed generation (DG) facilities. International GS manufacturers configure relay protections (RP) in a way that narrows the acceptable range (AR) and causes properly functioning RPs to effect unnecessary disconnections. It has been shown that the worst disturbances are observed when a microgrid that carries a DG facility is islanded, and power imbalance occurs; when motors start in groups; when the GS’s shed 95% of their output; and when a 3-phase short-circuit occurs in an islanded grid segment. Energy storage units (ESU) are the most recent and highly successful solution to many problems of power engineering. The authors hereof have developed a method that controls active and reactive power of an ESU independently to avoid unnecessary GS disconnections that would otherwise be caused by a short-term deviation in frequency; this will help reliably deliver electricity to the users of an islanded microgrid. Simulation results show that the use of ESUs helps to effectively extend the acceptable range for generator sets. There are recommendations on drawing technical requirements to ES. An important advantage of the proposed ESU power control method is that it does not need to adjust ES-received control actions (CA) online for frequency deviation.

scholarly journals FAST ADAPTIVE PROTECTION AGAINST SHORT CIRCUITS IN MICROGRID ELECTRIC NETWORKS WITH DISTRIBUTED GENERATION

2021 ◽  
Vol 2021 (1) ◽  
pp. 57-60
Author(s):  
N.V. Grebchenko ◽  
◽  
Y.V. Yeromenko ◽  
Keyword(s):  
Distributed Generation ◽  
Short Circuit ◽  
Electric Networks ◽  
Stable Mode ◽  
Power Sources ◽  
Entire Line ◽  
Mode Of Operation ◽  
Operating Current ◽  
Short Circuits ◽  
Response Current

Protection against short circuits in microgrid networks with distributed generation is proposed, in which the power of the power sources and loads are constantly changing, which leads to a change in the sensitivity of relay protection. The response current of the proposed protection automatically adapts to the current value of the line operating current. The protection includes measures to block its action in the event of short-term interference in current circuits. Protection is installed on both sides of the line and protects the entire line, provides a stable mode of operation of the network due to the quick shutdown of short circuits. The algorithm of operation and the scheme for implementing protection are given. The protection operation was tested using the parameters of the real short circuit mode. References 7, figures 3.

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