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With the recent emphasis on environmental issues and concerns for global warming, many states have adopted aggressive Renewable Portfolio Standards (RPS) requiring electricity suppliers to obtain a minimum percentage of their power from renewable energy resources by a given date. Among various states, California leads with an RPS of 20% by 2010, and 33% by 2020. Most renewable resources, by their...
This paper has described a high-level plan for wide-area control implementation in an EMS to improve power system grid security. The primary intent is to protect the electrical interconnection from a widespread collapse. Wide area controls are meant to protect the grid as an entity. In some cases, the appropriate action would be islanding and blacking out a portion of the grid in order to prevent...
Application of integrated EMS of dispatching - centralized control in Guangzhou electric network control center is described and analyzed in this paper. As the describe of the architecture and the characters of the Application, the new characters, problem and method is focused on in this paper. The two integrated EMS of dispatching - centralized control in Guangzhou electric network control center...
Energy Management Systems (EMS) play the all important role of monitoring and control of the power systems and state estimation forms its backbone. In these days of increased operation of power system near to its limits and the tendency to utilize the grid to its full potential, monitoring and control with high level of accuracy becomes a boon. Dynamic state estimation (DSE) techniques with their...
Energy management systems (EMSs) suffer from poor external modeling during wide area event occurring in interconnected power systems. In order to improve this situation, an IEC61970 standard based hierarchical network remodeling system for electrical power control centers is designed in China. In this designed system, through a wide-area communication network, each underlying control center automatically...
Powerlink Queensland is currently in the advanced stage of implementing a CIM-based enterprise-wide network asset model maintenance system. This model allows a single common repository for the planned and operational network model for use by planning, operations, EMS and protection. Planners are able to enter future projects with multiple possible scenarios with the capability to move the projects...
The energy management system (EMS) is the core of an electric power control center (EPCC) to manage and control the power system in a secure and economical way. Because the power system nowadays is large and interconnected (in the space dimension), the operational state is continuously varying (in the time dimension), and the control objectives are numerous (in the dimension of objectives), an EMS...
Cyber system plays an important role in supervising and controlling power system. Besides its contribution of much convenience to power industry, the cyber system brings some potential danger because of its inherent vulnerability. It is significant to assess the vulnerability of cyber system, determine its risk to power industry, find out the weak parts, set appropriate strategies to avoid the probable...
The following topics were dealt with: energy storage technologies; on-line reliability assessment and control; HVDC and FACTS technologies; communications for distribution system; power transformer; wind farm; SCADA; EMS; power market; power electronics; power system planning; power quality; power system harmonics; power system protection; power system control; power system simulations; substation;...
As the central nerve system of the power systems, the control center has evolved over the years into a complex communication, computation, and control system. The traditional control center, SCADA/EMS, was built to automate control functions in electric utilities. With the expansion and interconnection of power systems and the advent of electric power deregulation, electric utility organizations require...
PJM Interconnection (USA) and Powertech Labs Inc. (Canada) have successfully designed and implemented a Transient Stability Analysis & Control (TSA&C) system at PJM system control center by using new techniques. This is a first real time transient stability analysis and control tool developed for such a large power system. PJM's EMS provides a real time snapshot including power flow case from...
This paper recalls the 30-year history of wide-area measurements at Hydro-Quebec. At present, a state-of-the art, eight-PMU-based wide-area monitoring system commissioned in 2004 is on line, feeding the EMS with GPS-synchronized angles, frequencies, and harmonic distortion measurements from key 735-kV buses. Specific to Hydro-Quebec is the current use of one such system for frequency regulation reporting...
This paper describes technology required for advanced intelligent voltage and reactive secondary control systems enabling co-ordination of voltage control between main and local power systems. Firstly, the paper comments on the inadequate behavior of voltage and reactive power control systems, such as up-and-down fluctuations, which sometimes occur during off-peak load times, and explains the reasons...
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