A multi-functional power conditioner with real-time voltage regulation for energy saving

2008 ◽  
Vol 18 (1) ◽  
pp. 15-28 ◽  
Author(s):  
T. T. Ma ◽  
S. J. Chiang
Keyword(s):  
Energy Saving ◽  
Real Time ◽  
Voltage Regulation ◽  
Power Conditioner

Energy-Efficient Scheduling for Embedded Real-Time Systems Using Threshold Work-Demand Analysis

2017 ◽  
Vol 26 (06) ◽  
pp. 1750091 ◽  
Author(s):  
Linwei Niu ◽  
Wei Li
Keyword(s):  
Energy Saving ◽  
Real Time ◽  
Energy Efficient ◽  
Critical Speed ◽  
Demand Analysis ◽  
Real Time Systems ◽  
Work Demand ◽  
Hard Real Time ◽  
Time Systems ◽  
Earliest Deadline

In this paper, we study the problem of reducing the energy consumption for hard real-time systems scheduled according to either fixed-priority (FP) or earliest-deadline-first (EDF) scheme. To balance the static and dynamic energy consumptions, the concept of critical speed was proposed in previous research. Moreover, when combined with the processor idle/shutdown state, the critical speed was widely used as the lower bound for voltage scaling in literature. In this paper, we show that this strategy might not always be more energy efficient than the traditional DVS strategy and there exists a dynamic tradeoff between these two strategies depending on the job’s work-demand to be finished within certain intervals. To effectively address this issue, we propose a unified approach that combines these two strategies to achieve better overall energy saving performance. Our approach determines the energy-efficient speeds for real-time jobs in their corresponding feasible intervals based on the threshold work-demand analysis. Our experimental results demonstrate that the proposed techniques significantly outperform previous approaches in the overall energy saving performance.

Blackout Avoidance and Energy Saving Services with Alert Aggregation

2012 ◽  
Vol 3 (4) ◽  
pp. 40-56
Author(s):  
Erica Fong ◽  
Dickson K.W. Chiu ◽  
Haiyang Hu ◽  
Yi Zhuang ◽  
Hua Hu
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Real Time ◽  
Mobile Devices ◽  
Critical Energy ◽  
The Internet ◽  
Monitor System ◽  
Energy Usage ◽  
Huge Number ◽  
Smart Meters

Peak electricity demands from huge number of households in a mega-city would cause contention, leading to potential blackout. This paper proposes bi-directional collaboration via a Smart Energy Monitor System (SEMS) between consumers and energy suppliers, exchanging real-time energy usage data with smart meters over the Internet and mobile devices for well-informed decisions and even predictions. The authors further propose the use of an Alert Management System (AMS) to monitor and aggregate critical energy consumption events for this purpose.

scholarly journals Flywheel vs. Supercapacitor as Wayside Energy Storage for Electric Rail Transit Systems

Inventions ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 62
Author(s):  
Mahdiyeh Khodaparastan ◽  
Ahmed Mohamed
Keyword(s):  
Energy Storage ◽  
Energy Saving ◽  
Voltage Regulation ◽  
Appropriate Technology ◽  
Rail Transit ◽  
Peak Demand ◽  
Transit System ◽  
Transit Systems ◽  
Industrial Sectors ◽  
Demand Reduction

Energy storage technologies are developing rapidly, and their application in different industrial sectors is increasing considerably. Electric rail transit systems use energy storage for different applications, including peak demand reduction, voltage regulation, and energy saving through recuperating regenerative braking energy. In this paper, a comprehensive review of supercapacitors and flywheels is presented. Both are compared based on their general characteristics and performances, with a focus on their roles in electric transit systems when used for energy saving, peak demand reduction, and voltage regulation. A cost analysis is also included to provide initial guidelines on the selection of the appropriate technology for a given transit system.

Smart LED Lawn Lamp Control System

2013 ◽  
Vol 437 ◽  
pp. 678-681
Author(s):  
Shinnfwu Wang ◽  
Hao Ma ◽  
Yi Chu ◽  
Yu Pin Liao ◽  
Shyhrong Lay ◽  
...  
Keyword(s):  
Control System ◽  
Energy Saving ◽  
Environmental Protection ◽  
Real Time ◽  
Energy Management ◽  
Traffic Safety ◽  
Pwm Control ◽  
Real Time Monitoring ◽  
Control Center ◽  
Control Circuits

In this paper, a smart LED lawn lamp control system is proposed. The system consisting of LED lawn lamps, PWM control circuits and ZigBee module is used to control the light dimming and energy management. Thus, the goals of environmental protection and energy-saving features can be achieved. In addition, the automatic warning mechanism in the street light is included in the system for the sake of traffic safety. The control center will receive the message immediately only if some sudden events. At this moment, the system will notice the maintenance man or related organization. However, the system has several advantages such as real-time monitoring, energy saving, easy maintenance and management, etc.

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