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Power Systems Operations and Planning departments historically use different models. Online operations models are based upon node-breaker representation of the system whereas offline planning models are based on bus-branch representation of the same system. Use of different models to represent the same power system leads to discrepancies in data and makes it difficult and inefficient to validate the...
A prompt and accurate bulk system islanding detection capability is essential for real-time operation to maintain system reliability. This paper introduces and proposes two islanding detection methods, “Frequency Standard Deviation” and “Relative Phase Angle Change Rate” based on PMU measurement. The detailed analysis and explanation of the approaches to the design of islanding scheme is provided...
The recent growth in the synchrophasor measurement and communications technology has been an unprecedented change from an Energy Management System (EMS) control center perspective. For decades, traditional EMS capabilities have been based on 2–4 second SCADA measurements. As the number of milli-second rate, time-tagged synchrophasor Phasor Measurement Units (PMUs) grow in number, control centers now...
With smart grid typically characterized by attributes like, reliable and secure, efficient and economic, environment friendly and safe to the extreme extent as feasible, it calls for quality transmission and distribution operation backed by generation with optimum utilization of assets considering expected level of commitment from all stakeholders. Latter encompass investors, owners, traders, service...
State estimator is vital for on-line power system monitoring, analysis and control. With the increasing use of synchronized phasor measurement units (PMU) in power grids, how to utilize phasor measurements to improve the precision of state estimator becomes imperative. In this paper, a state estimator including voltage phasors, injected current phasors and traditional measurements is proposed. 14...
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...
This paper describes the implementation, testing, and performance of phasor measurements in an industrial state estimation at the New York Power Authority (NYPA). Phasor Measurement Units (PMU) with GPS synchronization were incorporated into the data acquisition subsystem of the Energy Management System (EMS). The modified state estimator was subjected to pre- and post-field installation testing....
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...
A major step in the evolution of Energy Management System (EMS) capabilities is towards improved presentation of real-time power system condition information (not just data) to the system operator; the primary purpose being to facilitate prompt identification and location of problem areas, and to expedite confident decision-making, in order to mitigate or obviate escalation of the problem at hand.
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