scholarly journals Renewable energy integrated multi-terminal transmission system using wavelet based protection scheme

2019 ◽  
Vol 10 (2) ◽  
pp. 995
Author(s):  
Savarapu Chandra Sekhar ◽  
G. Ravi Kumar ◽  
S.V.N.L Lalitha
Keyword(s):  
Power Plants ◽  
Satellite Communication ◽  
Research Work ◽  
Fast Response ◽  
Transmission System ◽  
Protection System ◽  
Mother Wavelet ◽  
Protection Scheme ◽  
Distributed Generators ◽  
Protection Systems

The power plants behavior is crucial under faulted conditions and responses on protection systems. Major microgrid (MG) protection problem is the problem between the fault current in utilitygrid mode and microgrid mode. As conventional protection system doesn’t offer solution for all MG protection challenge, but it needs advanced protection strategy. Protection system must response to both the utilitygrid and MG faults. Fast response of protection is necessary as early as possible if the fault is occurs on utilitygrid and if the fault is occurs on MG, the protection scheme must seperate the small possible portion of MG to remove the fault. This work presents a typical MG protection scheme using digital relaying and satellite communication with wavelet detailed D<sub>1</sub>-coefficients of mother wavelet Bior 1.5. This research work is done for the detection, discrimination and locality of faults at distributed generators (DG’s) integration in multi-terminal transmission system. The algorithm tested under various faults with fault inception angles (FIA), fault impedances and fault distance of feeder line.

scholarly journals ANALISIS PROTEKSI KEBAKARAN PADA PERUSAHAAN PRODUKSI GAS DAN PEMBANGKIT LISTRIK

2018 ◽  
Vol 7 (2) ◽  
pp. 142
Author(s):  
Bery Romadhon
Keyword(s):  
Fire Protection ◽  
Power Plants ◽  
Fire Hazard ◽  
Protection System ◽  
Fuel Oil ◽  
Active Fire ◽  
Oil Storage ◽  
Production Site ◽  
Passive Fire Protection ◽  
Protection Systems

PT. Gresik Gases Indonesia and PT. Gresik Power Indonesia is a company engaged in the production of gas and power plants with natural gas and diesel power. This production site has a potential fire hazard so it must be implemented active and passive fire protection system. This research held to determine the suitability of active fire protection systems, passive in the workplace based on with several standards such as the SNI 03-3985-2000, NFPA 13, Permenaker no. 04/1980, Permen PU no. 26/PRT/M/2008, SNI 03-1745-2000. Observational data collection used regulated checklists, with cross-sectional research design. This production site was the potential for serious hazards to cause large area fire and in a short time. Classification of fire in this production of type A, B, C were derive from fuel oil storage tanks, T 80 C, T 80 D, MCC 20 KV, SHEQ and admin office, ware house, gas compressor area, gas engines, combustion turbine, control room, centrifuge pump, and regent heater. Active fire protection was several assessments such as alarm, detector, sprinkler, exhaust, and hydrant. On passive fire protection, the assessment was based on buildings. Field observations obtained the following results active protection system such as alarm with enough categories, detector with enough categories, sprinkler with enough categories, a fire extinguisher with a good category, hydrants with good categories and on passive fire protection systems with sufficient category.Keywords: fire protection, gas production, power plant

scholarly journals Fault Analysis and Design of a Protection System for a Mesh Power System with a Co-Axial HTS Power Cable

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 220 ◽  
Author(s):  
Thai-Thanh Nguyen ◽  
Woon-Gyu Lee ◽  
Hak-Man Kim ◽  
Hyung Yang
Keyword(s):  
Power System ◽  
Fault Analysis ◽  
Protection System ◽  
Power Cable ◽  
Analysis And Design ◽  
Protection Scheme ◽  
System Protection ◽  
Protection Systems ◽  
Overcurrent Relays ◽  
System Characteristics

The uses of high-temperature superconducting (HTS) cables pose a challenge of power system protection since the impedance of the HTS cable is varied during fault conditions. The protection systems should be designed properly to ensure the reliability and stability of the whole system. This paper presents a fault analysis of the co-axial HTS cable in the mesh system and proposes a coordinated protection system. In the proposed protection system, the main protection is the differential current relay whereas the backup protections are the overcurrent and directional overcurrent relays. The normal and abnormal relay operations are considered to analyze the transient fault current in the HTS cable and evaluate the performance of the proposed coordinated protection system. Characteristics of cable impedances and temperatures under various fault conditions are presented. The proposed protection scheme is validated by the simulation in the PSCAD/EMTDC program. Simulation results show that the coordinated protection scheme could successfully protect the HTS cables in both normal and abnormal relay operations.

scholarly journals The Power System and Microgrid Protection—A Review

2020 ◽  
Vol 10 (22) ◽  
pp. 8271 ◽  
Author(s):  
Jalal Sahebkar Farkhani ◽  
Mohammad Zareein ◽  
Arsalan Najafi ◽  
Rui Melicio ◽  
Eduardo M. G. Rodrigues
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Renewable Energy Sources ◽  
Distribution Network ◽  
Protection System ◽  
Local Network ◽  
Energy Sources ◽  
Generation Model ◽  
Protection Scheme ◽  
Protection Systems

In recent years, power grid infrastructures have been changing from a centralized power generation model to a paradigm where the generation capability is spread over an increasing number of small power stations relying on renewable energy sources. A microgrid is a local network including renewable and non-renewable energy sources as well as distributed loads. Microgrids can be operated in both grid-connected and islanded modes to fill the gap between the significant increase in demand and storage of electricity and transmission issues. Power electronics play an important role in microgrids due to the penetration of renewable energy sources. While microgrids have many benefits for power systems, they cause many challenges, especially in protection systems. This paper presents a comprehensive review of protection systems with the penetration of microgrids in the distribution network. The expansion of a microgrid affects the coordination and protection by a change in the current direction in the distribution network. Various solutions have been suggested in the literature to resolve the microgrid protection issues. The conventional coordination of the protection system is based on the time delays between relays as the primary and backup protection. The system protection scheme has to be changed in the presence of a microgrid, so several protection schemes have been proposed to improve the protection system. Microgrids are classified into different types based on the DC/AC system, communication infrastructure, rotating synchronous machine or inverter-based distributed generation (DG), etc. Finally, we discuss the trend of future protection schemes and compare the conventional power systems.

scholarly journals Outage Analysis and System Disturbances on 330 kV and 132 kV Transmission System in Nigeria

2020 ◽  
Vol 5 (1) ◽  
pp. 100-102
Author(s):  
Najeem Olawale Adelakun ◽  
Banji Abubakar Olanipekun
Keyword(s):  
Power Supply ◽  
Electricity Generation ◽  
Research Work ◽  
Transmission System ◽  
The Body ◽  
Power Outage ◽  
Grid Network ◽  
Protection Scheme ◽  
The Government ◽  
Outage Analysis

The Persistent power outage in the country due to faults has become alarming to the government and the body responsible for electricity generation in the country. It also creates a major problem for electricity consumers in Nigeria, there must be an improvement in the reliability of the transmission system in Nigeria. This research work is predominantly concerned with the analysis of outages on 330kV and 132kV transmission system, and system disturbances on generation and transmission system for five (5) years. The result shows that the forced outages are the most occurred outages on the 330 kV line, while on 132 kV line, emergency outages have the highest number of outages in 2014 but decreases rapidly over the years, similarly, twenty-seven (27) major system disturbances occurred in 2016 with 31% against ten (10) with 11% disturbances in 2015, while 2014 and 2018 with the same number of system disturbances of thirteen (13) with 15%, it is apparent that more disturbances occur on the transmission system, and there should be a proper protection scheme to maintain stable grid network. Consequently, Mini-grid and off-grid solutions will prominently address the issue of power supply shortage and instability in Nigeria. Keywords: outage, transmission, generation, disturbances, grid.

scholarly journals Modelling of FPGA-based Reactor Protection Systems of an Experimental Power Reactor

2021 ◽  
Vol 2048 (1) ◽  
pp. 012038
Author(s):  
T J Suryono ◽  
Sudarno ◽  
S Santoso ◽  
R Maerani
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Power Reactor ◽  
Reactor Core ◽  
Protection System ◽  
Programmable Logic ◽  
Fission Reaction ◽  
Protection Systems ◽  
Reactor Protection System ◽  
Control Rods

Abstract The reactor protection system of nuclear power plants including an experimental power reactor which will be built by Indonesia is a safety system that actuates the control rods to be inserted in the reactor core to absorb the neutron to stop the fission reaction and then shut down the reactor (reactor trip). The reactor protection system (RPS) is actuated when the level of signals from the sensors of important components in the reactors deviates from the setpoint determined in the bi-stable processor of the RPS. RPS for the experimental power reactor has 3 redundant channels for reliability and to minimize fake signals from the sensors due to electrical noise. It can be done by selecting the channels in local coincidence logic in the RPS by voting 2 of 3 channels which are eligible to generate actuation signals to trip the reactor. Recently, the RPSs are based on the programmable logic controller (PLC). However, now the trend changes to FPGA-based RPS because of its simplicity and reliability. This paper investigates the model of the FPGA-based RPS for an experimental power reactor and the functionality of each component of the model. The results show that the model can represent the functionality of RPS for the experimental power reactor.

Cloud-Based Multimedia Content Protection System

2020 ◽  
pp. 164-169
Author(s):  
B. Aparna ◽  
S. Madhavi ◽  
G. Mounika ◽  
P. Avinash ◽  
S. Chakravarthi
Keyword(s):  
Large Scale ◽  
Protection System ◽  
Multimedia Content ◽  
Computationally Efficient ◽  
Content Protection ◽  
Protection Systems ◽  
Multimedia Content Protection ◽  
High Scalability ◽  
Cloud Infrastructures ◽  
Rapid Deployment

We propose a new design for large-scale multimedia content protection systems. Our design leverages cloud infrastructures to provide cost efficiency, rapid deployment, scalability, and elasticity to accommodate varying workloads. The proposed system can be used to protect different multimedia content types, including videos, images, audio clips, songs, and music clips. The system can be deployed on private and/or public clouds. Our system has two novel components: (i) method to create signatures of videos, and (ii) distributed matching engine for multimedia objects. The signature method creates robust and representative signatures of videos that capture the depth signals in these videos and it is computationally efficient to compute and compare as well as it requires small storage. The distributed matching engine achieves high scalability and it is designed to support different multimedia objects. We implemented the proposed system and deployed it on two clouds: Amazon cloud and our private cloud. Our experiments with more than 11,000 videos and 1 million images show the high accuracy and scalability of the proposed system. In addition, we compared our system to the protection system used by YouTube and our results show that the YouTube protection system fails to detect most copies of videos, while our system detects more than 98% of them.

The Impact of Plant Protection Systems on the Productivity of Soybean Varieties under Irrigated Conditions

2019 ◽  
pp. 109-117
Keyword(s):  
Plant Protection ◽  
Crop Protection ◽  
Production Costs ◽  
Protection System ◽  
Average Weight ◽  
The South ◽  
Biological Origin ◽  
Chemical Protection ◽  
Protection Systems ◽  
The Impact

The application of preparations of biological origin in the protection system of soybean grown under conditions of intensive irrigated crop rotations conforms to the modern tendencies of science and production development. The use of them contributes to solving ecological, production and social-economic problems. The study presents the three-year research on the efficiency of systems protecting soybean from pests and diseases based on biological and chemical preparations. The research was conducted in typical soil and climate conditions of the South of Ukraine. Zonal agricultural methods and generally accepted research methodology were used. The purpose of the research was to create a soybean protection system based on preparations of biological origin, ensuring high productivity of high-quality products reducing a negative impact of the crop production on the environment. The study emphasizes that, under irrigated conditions of the South of Ukraine, the application of biological preparations has a positive impact on the indexes of growth, development and formation of the elements of soybean yield structure. There was an increase in the crop biological weight by 13.8 % and 22.1 % and the number of seeds per plant rose by 11.6 and 14.6 % as a consequence of eliminating harmful organisms with the plant protection systems. The larger ground mass was formed by medium-ripe varieties Danai and Svyatogor, on which the increase from protection measures was higher. Weight 1000 pcs. the seeds did not undergo significant changes. It is established that the larger seeds were formed by Danaya and Svyatogor varieties, in which the average weight is 1000 pcs. seeds were 142 and 136 g, respectively, while in the variety Diona this figure was 133 g. There was an increase in the height of the lowest pod when the total plant height rose. For medium-ripe varieties was characterized by a higher attachment of beans, where the highest values of this indicator acquired in the variety Svyatogor. The medium maturing soybean variety Danaia formed the maximum yield of 3.23 and 3.35 t/ha respectively, when biological and chemical protection systems were applied. The research establishes that the application of the bio-fungicide Psevdobakterin 2 (2.0 l/ha) in the crop protection system at the beginning of soybean flowering and the bio-fungicide Baktofit (2.5 l/ha) with the bio-insecticide Lepidotsid-BTU (10.0 l/ha) at the beginning of pod formation does not reduce the productivity of the soybean varieties under study considerably, when compared to the application of chemical preparations. The research determines that the soybean protection system under study ensures a decrease in the coefficient of soybean water uptake by 7.2-13.0 %, increasing the total water intake to an inconsiderable degree. Biologization of the soybean crop protection system leads to a reduction in production costs compared to the chemical protection system. Taking into account the needs for the collection of additional products, costs increase by an average of 1 thousand UAH/ha, while for chemical protection systems by 1.8 thousand UAH/ha. At the same time, the cost is reduced by 220-360 UAH/t and the profitability of growing crops is increased by 3.8-7.8 %. There has been a reduction in the burden of pesticides on the environment and the production of cleaner products. This indicates the prospect of using the biofungicides Pseudobacterin 2 and Bactophyte and the bioinsecticide Lepidocid-BTU on soybeans to protect plants from pests.

Sign in / Sign up

Export Citation Format

Share Document