scholarly journals Optimization for Postearthquake Resilient Power System Capacity Restoration Based on the Degree of Discreteness Method

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Lihua Wang ◽  
Donghui Ma ◽  
Xu Han ◽  
Wei Wang
Keyword(s):  
Power System ◽  
Power Supply ◽  
Power Supply System ◽  
Recovery Process ◽  
Supply System ◽  
System Capacity ◽  
Normal Operation ◽  
Relative Importance ◽  
Equilibrium Degree ◽  
Power Restoration

The occurrence of a natural disaster such as a strong earthquake affects not only the capacity of a city’s power supply system but also the normal operation of other lifeline systems. An urban emergency power supply system is used to manage the power supply restoration with the consumers divided into three types based on their impact and importance during a power failure. In this study, a power supply system equipped to meet the requirements of different restoration level facilities and enable the restoration of power after the occurrence of an earthquake was developed. A three-stage power restoration curve was formulated based on the postearthquake recovery process. The relative importance factors of consumers can be calculated with a normalization model based on membership degree. These relative importance factors were then combined with the postearthquake recovery capabilities of each consumer to calculate the overall recovery capability and equilibrium degree of the urban power system. Using the two foregoing indicators, the power supply recovery level of the power system after an earthquake was quantitatively analyzed, and the power supply scheme of the consumers with different power supply guarantee types was rationally optimized.

Optimization of Active Magnetic Bearings’ Power Supply System for Main Helium Fan in High Temperature Gas-Cooled Reactor

2021 ◽  
Author(s):  
Huan Luo ◽  
Zhengang Shi ◽  
Yan Zhou ◽  
Ni Mo
Keyword(s):  
High Temperature ◽  
Power Supply ◽  
Power Supply System ◽  
Magnetic Bearing ◽  
Supply System ◽  
Buck Converter ◽  
Normal Operation ◽  
Rotating Equipment ◽  
Amb System ◽  
High Temperature Gas

Abstract High temperature gas-cooled reactor (HTR) is a kind of reactor with inherent safety developed by Institute of Nuclear Energy and New Energy Technology of Tsinghua University. In the first circuit, pure helium is used as coolant and the main helium fan is used to promote the coolant circulation. In order to meet the requirements of service environment and performance, the main helium fan adopts the non-lubricant active magnetic bearing (AMB) system as its support system. For the high-speed rotating equipment supported by AMBs, losing power would lead to bearing failure and cause serious damage to the equipment. In this paper, the power supply system of AMBs is optimized. The power supply of AMB system is connected with the DC-link of the motor converter through DC/DC converter. During normal operation, the AMB system is supplied by external power supply, and the DC/DC converter is used as the backup redundant power supply. In the event of a power failure accident, the DC/DC converter is put into operation, converting the remanet kinetic energy of the motor into stable power to maintain the normal operation of the AMB system. The DC/DC converter adopts two-stage topology structure of the former BUCK converter and the later LLC converter, and completes the voltage stabilization control of the latter LLC converter through the digital signal processor (DSP). Experimental results show that this scheme can realize the power loss protection function of the rotating equipment supported by AMBs.

scholarly journals Model and Simulation of Permanent Magnets Synchronous Machine (PMSM) of the Electric Power Supply System (EPS), in Accordance with the Concept of a More Electric Aircraft (MEA)

2018 ◽  
Vol 16 ◽  
pp. 03004 ◽  
Author(s):  
Lucjan Setlak ◽  
Rafał Kowalik
Keyword(s):  
Power System ◽  
Electric Power ◽  
Power Supply ◽  
Power Supply System ◽  
Permanent Magnets ◽  
Synchronous Generator ◽  
Supply System ◽  
Power Sources ◽  
Electric Aircraft ◽  
More Electric Aircraft

Based on the mathematical model of synchronous electric machine, basing on permanent magnets, presented in this paper, the key importance of alternator AC power sources in the form of generator (for conventional aircraft) and in the form of integrated unit starter/AC synchronous generator S/G AC (with respect to advanced aircraft concept in the field of more/all electric power MEA/AEA) was highlighted. In addition, through the analysis and selected simulations of the power supply system of a modern aircrafts, sources of onboard electrical energy (synchronous generator, integrated unit starter/AC generator) were located in board autonomic power system ASE (EPS, PES). Key components of this system are the electro-energetic power system EPS and the energo-electronic power system PES. Additionally, the analysis and exemplary simulations of key electricity sources based on mathematical models have contributed to highlighting the main practical applications in line with the trend of a more electric aircraft.

scholarly journals The Study of Permanent Magnets Synchronous Machine (PMSM) of the Autonomous Electric Power Supply System (ASE), compatible with the Concept of a More Electric Aircraft (MEA)

2018 ◽  
Vol 16 ◽  
pp. 03001 ◽  
Author(s):  
Lucjan Setlak ◽  
Rafał Kowalik
Keyword(s):  
Power System ◽  
Mathematical Models ◽  
Power Supply ◽  
Power Supply System ◽  
Permanent Magnets ◽  
Supply System ◽  
Power Sources ◽  
Electric Power Supply ◽  
Electric Aircraft ◽  
More Electric Aircraft

Based on the analysis and mathematical models of synchronous electric machines (motor/generator), basing on permanent magnets, presented in this paper, the main importance of alternator AC power sources in the form of starter/generator (for conventional aircraft) and in the form of integrated unit starter (motor)/AC synchronous generator S/G AC (with respect to advanced aircraft concept in terms of more electric aircraft) was highlighted. Additionally, through the analysis and selected simulations of the on-board autonomous power supply system of the modern aircrafts, sources of electrical energy (synchronous motor/generator, integrated unit starter/AC generator) were located in board autonomic power system ASE (EPS, PES). Main components of this system are the electro-energetic power system EPS and the energo-electronic power system PES. In addition, the analysis and exemplary simulations of main electricity sources based on mathematical models have contributed to highlighting the main practical applications in accordance with the concept of MEA.

scholarly journals The Efficiency of Distributed and Centralized Power System Integration

2019 ◽  
Vol 114 ◽  
pp. 05007 ◽  
Author(s):  
Felix Byk ◽  
Yana Frolova ◽  
Ludmila Myshkina
Keyword(s):  
Power Systems ◽  
Power System ◽  
Distributed Generation ◽  
Power Supply ◽  
Power Plants ◽  
Power Supply System ◽  
Supply System ◽  
Technical Solution ◽  
Local Power ◽  
The Impact

The existing centralized power supply system has the alternative due to distributed generation. By certain conditions distributed cogeneration allows to increase the reliability and quality of power supply and to reduce the cost of electricity for consumers. Therefore, a lot of energy-intensive consumers switched to their own power supply systems, as it turned out to be a competitive technical solution. The total gasification of the country’s regions and the presence of domestic manufacturers of gas turbine and gas piston power plants accelerated this process. Nowadays local power systems are emerging with cogeneration plants are the main source of heat and electricity there. The feasibility justification of the kind and type of generation is determined by many factors, including circuit-mode parameters in the local power system and adjacent network. Local power systems based on the principles of self-balance are proposed to name as energy cells. The integration of energy cells with regional power system increases the technical and economic effectiveness of power supply system for consumers. The proposed power systems transition leads to certain systemic effects. Received effects are depending on functions of distributed generation. This paper explores the impact of scheme and mode factor on the technical effects.

scholarly journals Optimization of the power supply system for connection of the end user to electric grids according to the scheme of the third category of reliability

2018 ◽  
Vol 58 ◽  
pp. 02011
Author(s):  
Ivan Bandurin ◽  
Alexey Khaimin
Keyword(s):  
Mathematical Model ◽  
Power System ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
End User ◽  
The Third ◽  
Electric Grids ◽  
The Mathematical Model ◽  
Optimal Type

The article first developed a mathematical model of optimization of the power supply system for connection of the end user to electric grids according to the scheme of the third category of reliability. The mathematical model allows to choose the optimal type and brand power system equipment.

Improving the fuel supply system of the vehicle

2021 ◽  
pp. 7-11
Author(s):  
Keyword(s):  
Power System ◽  
Power Supply ◽  
Heat Exchangers ◽  
Power Supply System ◽  
Supply System ◽  
Fuel System ◽  
Fuel Temperature ◽  
Ambient Temperatures ◽  
Positive Results ◽  
Testing Fuel

Today, one of the urgent problems of car operation is the problem of fuel overheating at elevated ambient temperatures, resulting in an error " fuel overheating" on the car, which in turn affects the car’s performance. This article presents research on testing fuel heat exchangers as part of a car’s fuel system by improving the design of the car’s power system. Three experiments were carried out to determine the temperature regime of the vehicle’s power supply system. Positive results of the work were obtained, which made it possible to eliminate the occurrence of the error " fuel overheating" and obtain stabilization of the fuel temperature. Keywords: power system, heat exchanger, cooling

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