scholarly journals Use of the Particle Swarm Technique to Optimize Parameters of Photovoltaic Generators on Networks with High Integration of Distributed Generation

2020 ◽  
Author(s):  
Luiz G. R. Tonini ◽  
Felipe Z. da Silva ◽  
Renato S. F. Ferraz ◽  
Oureste E. Batista ◽  
Augusto C. Rueda-Medina
Keyword(s):  
Distributed Generation ◽  
Reactive Power ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Energy Sources ◽  
High Penetration ◽  
Power Injection ◽  
Major Disruption ◽  
Electricity Power ◽  
Photovoltaic Generators

In search of greater diversity in energy sources, to meet the demand of the electricity power, the use of photovoltaic generators is increasing. Such components have their power generation specified by IEEE 1547/2018, which limits the power parameters of each one. In a situation of high penetration of distributed generation, generators can contribute to the electric current that will circulate within the system in case of a fault, causing major disruption to the mesh and the users. Seeking to reduce this impact, the paper will minimize the value of the short circuit current by adjusting the parameters of the photovoltaic generators. The analysis will be done on IEEE Test Feeder 13 and 34 nodes and will refer to generators from category A, B and without reactive power injection in the mesh.

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.

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 Techniques for Ensuring Fault Ride-Through Capability of Grid Connected DFIG-Based Wind Turbine Systems: A Review

2021 ◽  
Vol 18 (1) ◽  
pp. 39-46
Author(s):  
M. Shuaibu ◽  
A.S. Abubakar ◽  
A.F. Shehu
Keyword(s):  
Renewable Energy ◽  
Wind Turbine ◽  
Electricity Market ◽  
Energy Demand ◽  
Reactive Power ◽  
Short Circuit ◽  
Renewable Energy Sources ◽  
Dynamic Performance ◽  
Energy Sources ◽  
Fault Ride Through

Renewable energy sources (RES) are being integrated to electrical grid to complement the conventional sources to meet up with global electrical energy demand. Among other RES, Wind Energy Conversion Systems (WECS) with Doubly Fed Induction Generator (DFIG) have gained global electricity market competitiveness because of the flexible regulation of active and reactive power, higher power quality, variable speed operation, four quadrant converter operation and better dynamic performance. Grid connected DFIG-based WECS are prone to disturbances in the network because of direct connection of stator windings to grid. The ability of the Wind Turbine (WT) to remain connected during grid faults is termed the Fault Ride-Through (FRT) capability. The grid code requirement for integrating the DFIG-based WTs to power networks specified that they must remain connected and support the grid stability during grid disturbances of up to 1500 ms. The use of compensation devices offers the best FRT compliance thereby protecting the DFIG and the converters from voltage fluctuations and over currents during the grid fault. The paper presents a review of techniques employed in ensuring FRT compliance. The article also proposes the state-of-the-art techniques for compensating voltage sag/swell and limiting the fault short-circuit current. Keywords: Renewable energy sources, DFIG, wind turbine system, fault ride-through, grid codes, dual-functional DVR

scholarly journals Study and modelling of droop-controlled islanded mesh microgrids

2021 ◽  
Vol 280 ◽  
pp. 05015
Author(s):  
Youssef Hennane ◽  
Abdelmajid Berdai ◽  
Serge Pierfederici ◽  
Farid Meibody-Tabar ◽  
Vitaliy Kuznetsov
Keyword(s):  
Distributed Generation ◽  
Reactive Power ◽  
Control Method ◽  
Logical Consequence ◽  
Single Point ◽  
State Space Model ◽  
Power Sharing ◽  
Active And Reactive Power ◽  
High Penetration ◽  
Point Of Common Coupling

The active and reactive power sharing of distributed generation sources (DGs) connected to isolated microgrids with a single point of common coupling (mono-PCC) to which the loads are also connected has already been the subject of several studies. A high penetration rate of DGs based on renewable energies has as a logical consequence the development and implementation of mesh and more complex multi- PCC microgrids. In this paper, a developed droop control method for synchronization and power sharing between different DGs connected to a mesh islanded multi-PCC microgrid with many distributed generation sources (DGs) and different type of loads (including active load (CPL)) randomly connected to different PCCs is applied. Then, a state model of the entire mesh microgrid is developed integrating the generators with their controllers, power lines, droop algorithms and dynamic loads. This model is then used to study the asymptotic stability and robustness properties of the system. The simulation results confirm the effectiveness of the applied strategies for the synchronization of the different DGs to the microgrid while ensuring an efficient active and reactive power sharing. also, they confirm the validity of the developed state space model of the system.

scholarly journals Protection philosophy in low short-circuit capacity distribution grids with high penetration of converter-interfaced distributed renewable energy sources

2020 ◽  
Vol 14 (22) ◽  
pp. 4978-4988
Author(s):  
Spyros I. Gkavanoudis ◽  
Dimitrios Tampakis ◽  
Kyriaki-Nefeli D. Malamaki ◽  
Georgios C. Kryonidis ◽  
Eleftherios O. Kontis ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Short Circuit ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
High Penetration ◽  
Distribution Grids

scholarly journals Improved Faulted Phase Selection Algorithm for Distance Protection under High Penetration of Renewable Energies

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 558
Author(s):  
Eduardo Martínez Carrasco ◽  
María Paz Comech Moreno ◽  
María Teresa Villén Martínez ◽  
Samuel Borroy Vicente
Keyword(s):  
Short Circuit ◽  
Renewable Energy Sources ◽  
Short Circuit Current ◽  
Renewable Energies ◽  
Photovoltaic System ◽  
Fault Current ◽  
Distance Protection ◽  
Phase Selection ◽  
High Penetration ◽  
Analysis Of Results

The high penetration of renewable energies will affect the performance of present protection algorithms due to fault current injection from generators based on power electronics. This paper explains the process followed for analyzing this effect on distance protection and the development of a new algorithm that improves its performance in such a scenario. First of all, four commercial protection relays were tested before fault current contribution from photovoltaic system and full converter wind turbines using the hardware in the loop technique. The analysis of results obtained, jointly with a theoretical analysis based on commonly used protection strategy of superimposed quantities, lead to a conclusion about the cause of observed wrong behaviors of present protection algorithms under a high penetration of renewables. According to these conclusions, a new algorithm has been developed to improve the detection of faulted phase selection and directionality on distance protection under a short circuit current fed by renewable energy sources.

Study on Protection for Islanded Micro-Grid

2012 ◽  
Vol 614-615 ◽  
pp. 916-920
Author(s):  
Xue Ling Zhu ◽  
Fei Han ◽  
Jia Liu
Keyword(s):  
Distributed Generation ◽  
Power Distribution ◽  
Distribution System ◽  
Short Circuit ◽  
Relay Protection ◽  
Short Circuit Current ◽  
Power Distribution System ◽  
Protection Strategy ◽  
Islanded Operation ◽  
Micro Grid

Technology of Micro-grid emerges, and power distribution system faults, allowing for the distributed generation keeping alive the islanded operation with the important load . But if the interior of Micro-grid happens a fault again, the short-circuit current of Micro-grid is so insufficient that traditional current protection can not play a part in the protection. In order to solve this problem, it introduced a new relay protection strategy, and provided the basis for the relay protection design of Micro-grid in the future.

Sign in / Sign up

Export Citation Format

Share Document