Showing papers on "Energy management system published in 2001"

System and method for planning energy supply and interface to an energy management system for use in planning energy supply

Abstract: A system for planning energy supply for energy consumers includes a first sub-system operatively associated with an energy coordinating body, such as an energy management system, and second sub-systems operatively associated with corresponding energy suppliers, such as power plants. A global communication network, such as the Internet, is employed between the first and second sub-systems. Each of the sub-systems includes an interface for exchanging energy planning information between the sub-systems and for negotiating an energy supply specification from the energy supplier to the energy consumers.

Hybrid energy locomotive electrical power storage system

Abstract: A hybrid energy locomotive system having an energy storage and regeneration system. In one form, the system can be retrofitted into existing locomotives, or installed as original equipment. The energy storage and regeneration system captures dynamic braking energy, excess motor energy, and externally supplied energy and stores the captured energy in one or more energy storage subsystems, including a flywheel, a battery, an ultra-capacitor, or a combination of such subsystems. The energy storage and regeneration system can be located in a separate energy tender vehicle. The separate energy tender vehicle is optionally equipped with traction motors. An energy management system is responsive to power storage and power transfer parameters, including data indicative of present and future track profile information, to determine present and future electrical energy storage and supply requirements. The energy management system controls the storage and regeneration of energy accordingly.

Hybrid energy locomotive system and method

Abstract: A hybrid energy locomotive system having an energy storage and regeneration system. In one form, the system can be retrofitted into existing locomotives or installed as original equipment. The energy storage and regeneration system captures dynamic braking energy, excess motor energy, and externally supplied energy, and stores the energy in one or more energy storage subsystems, including a flywheel, a battery, an ultra-capacitor, or a combination of such subsystems. The energy storage and regeneration system can be located in a separate energy tender vehicle. The separate energy tender vehicle is optionally equipped with traction motors. An energy management system is responsive to power storage and power transfer parameters, including data indicative of present and future track profile information, to determine present and future electrical energy storage and supply requirements. The energy management system controls the storage and regeneration of energy accordingly.

Energy is just another resource: energy accounting and energy pricing in the Nemesis OS

Abstract: In this paper, we argue that, with an appropriate operating system structure, energy in mobile computers can be treated and managed as just another resource. In particular, we investigate how energy management could be added to the Nemesis OS which provides detailed and accurate resource accounting capabilities in order to provide Quality of Service (QoS) guarantees for all resources to applications. We argue that, with such an operating system, accounting of energy to individual processes can be achieved. Furthermore, we investigate how an economic model, proposed for congestion avoidance in computer network, and recently applied to CPU resource management, can be used as a dynamic, decentralised energy management system, forming a collaborative environment between operating system and applications.

Locomotive energy tender

Abstract: An energy tender vehicle for use in connection with a hybrid energy locomotive system having an energy storage and regeneration system. The energy storage and regeneration system captures dynamic braking energy, excess motor energy, and externally supplied energy in one or more energy storage subsystems, including a flywheel, a battery, an ultra-capacitor, or a combination of such subsystems. In one form, the energy storage and regeneration system is located in the energy tender vehicle. The energy tender vehicle is optionally equipped with traction motors. In one form, the energy tender is configured to operate without any power connections to the locomotive. An energy management system is responsive to power storage and power transfer parameters, including data indicative of present and future track profile information, to determine present and future electrical energy storage and supply requirements. The energy management system controls the storage and regeneration of energy accordingly.

Community energy consumption management

Abstract: A energy management system provides the capability for a community server 150 to schedule jobs to be done in each household in a community, based on the availability, monetary cost and/or environmental cost of the energy required to complete a specific job, for example a washing cycle in a washing machine. The server receives from each household, task data indicative of at least one indicated task, each indicated task being associated with an energy consuming unit, and the server manages the provision of energy sources by creating a job schedule for scheduling the requested jobs as efficiently as possible and to complete performance of the indicated tasks in accordance with a community energy use strategy. The energy requirements and usage of the community can be tailored to favour usage of preferred and/or available energy resources, for instance by favouring the use of renewable or green energy resources over the use of fossil fuels.

Intelligent energy management of electrical power systems with distributed feeding on the basis of forecasts of demand and generation

Abstract: The intelligent energy management system described in this paper allows optimum short-term scheduling, especially of power systems with distributed feeding, considering energetic, ecological and economical criteria. With it, the demand of the loads is covered with the required reliability of supply regarding all technical constraints. The energy management work with evolutionary methods based on forecasts of the probability distribution of the power generated by the regenerative sources of energy as well as the demand of the load. For the prediction task the use of artificial neural networks is recommended. Precise rules for the design of the prediction system, which have been determined by systematic investigations, are presented. Even though forecasts of renewable energy generation show higher prediction errors than forecasting the load, it is possible to include renewable energy sources into power scheduling.

Studies of distributed energy supply systems using an innovative energy management system

Abstract: The liberalization of energy markets and the aims of the climate protection promote distributed systems. These systems permit inclusion of all practicable energy resources in the energy mix in connection with storage facilities, controllable loads as well as combined heating and power generation. This article describes an energy management system for distributed energy supply systems and it's application as a planning tool to prepare economy studies. The function of the energy management system is short-term optimization in co-generation systems, incorporating generating units using renewable primary energy. It is based essentially on the function packages forecast (weather, generation and load), operations planning and online modules. The operations planning takes into account different generating units, energy storage mechanisms, demand-side management, contracts and co-generation. The online modules perform redistribution of generation and load schedules, generation control and load control. The studies reported here deal with contract management, evaluation of emissions and renewable energy combined with battery systems.

Automatic decision support with a new visualization concept for power systems

Abstract: The requirements for operators in today's power system control centers increase due to the liberalization of electricity markets. Devices are utilized more efficiently, load flows change frequently according to a growing number of wheeling contracts, and the possibilities for control actions are reduced. Therefore the energy management system must support the control engineer with high-quality state information and proposals for effective actions in a user friendly way. The paper presents a new visualization concept which solves this task in a human focused way. The user interface is adapted to the structure of the human decision process and provides interactive access to different detail levels. Intelligent tools reduce the huge amount of single measurements to a few state indicators, which characterize the operating point and it's distance to the technical limits. Furthermore the automatic provision of control actions to the operator is described in the paper.

Development of PC based energy management system for electrical energy saving of high voltage customer

Abstract: This paper has developed a PC based energy management system associated with automatic meter reading and various load control functions for load management of industrial and commercial customers. Automatic meter reading configured by a programmable logic controller and power meter supports the function of recording 20 power parameters retrieved from an academic substation. Load control functions; which consist of demand control, timer control, cycling on/off control and direct control, are designed to effectively reduce peak load and to save electrical energy. Several types of software program coded by Visual Basic, PLC ladder language, and partial Diamond package, are designed to integrate all hardware equipment in energy management system. The entire system has been installed and successfully operated since October 1997. Statistical data collected from 1997/10 to 1999/10 indicate that the proposed effect for peak load cutting and energy saving may be justified.

Energy management system for motor vehicle on-board electrical system controls energy distribution taking into account current generation, storage, consumption component efficiencies

Abstract: The vehicle on-board electrical system consists of at least one generator and at least one storage battery and a number of loads. Energy distribution in the system is controlled taking into account the efficiency of the individual components involved in the generation of current, the storage of current and the consumption of current.

Ultracaps in power-assist applications in Battery Powered Electric Vehicles - Implications on Energy Management Systems

Abstract: In this paper a research project at the ‘Siemens AG Technical Academy of Berlin’, started in January 2001 will be described. The project focuses on the development of an energy management system for light electric vehicles (LEV), introducing latest technology. A power -assist system (Ultracaps) has to be added to a battery powered LEV. An energy management system to control both sources has to be developed. The Ultracaps used in this project have a capacity of 1200F per cell and are manufactured by EPCOS AG, Munich. 18 cells are connected in series and mounted in a case, resulting in a module capacity of 67F/42V. In that project, as an option, two of these modules can be used. In this case they are connected in parallel due to the voltage requirements of the vehicle. These modules have been designed especially for applications in the new 42V powernet being introduced to internal combustion engine vehicles (ICE) in the near future. The energy management system (EMS) described in this paper controls the flow of energy through the Ultracaps. The behavior of the ultracaps has been measured under different testing conditions on a test bench. Therefore a test bench has been developed allowing discharge currents up to 4kW continuous power, 600A maximum discharge current, 200A constant charging current. The source as well as the sink are parametrized either by a PC or a special microcontroller/DSP. The microcontroller controlling the energy management system is the new 32-Bit TriCore TC1775-B (Audo) Controller from Infineon Technologies AG. It has been designed especially for automotive applications, such as engine management. The bench is controlled by a 80C164 Microcontroller.

Electric Power System's Stability Assessment and Online-Provision of Control Actions Using Self-Organizing Maps

Abstract: Power utilities are interested in operating their grid closer to technical limits. Moreover competition leads to system states which the operators in control centers are not familiar with. In order to operate the higher stressed power system secure, even in critical situations, an efficient security assessment must provide high-quality state information instead of thousands of single values. Furthermore, the energy management system (EMS) must give proposals for control actions. The Self-Organizing Map (SOM) supports both tasks efficiently. The paper presents a SOM-based solution for fast security assessment and the provision of control actions. The application to a real power system also shows the capability of the tool for expressive visualization.