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The Topology Processing is a crucial part in the energy management system. The topology processor must handle reading of the input data, treating the splitting and merging buses and their connectivity to the different circuits and proceeding to islanding and energizing analysis of the network. It has also to support all the types of substations configurations. In this paper, the difficulties and constraints...
Variable generation dispatch and load distribution patterns due to renewables connected to transmission, distributed energy resources connected to the distribution system and the operation of electricity markets warrant that historical load and generation conditions be modeled in offline studies on a continuous basis instead of using the traditional peak load cases for Operations Planning studies...
SCADA (supervisory control and data acquisition) is a sophisticated system that allows controlling devices via coded signals into communication channels. Its main function is to allow the control of remote power system devices from a remote control center. In addition to the SCADA, complex software is required in order to analyze the data obtained from the system. Without proper analysis, the operator...
Uncertainty of load models affects state estimation (SE) solution robustness and quality at EMS control center, particularly at the locations where unmeasured loads are outside EMS footprint or when load measurements suddenly become unavailable. It is quite common that loads in external network are not measured and their model uncertainties based on scheduled or forecasted MW values are much higher...
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...
Operation engineers at EMS control center are very interested in the potential use of State Estimation (SE) technologies for identifying parameter and model errors, especially when encountering the scenario of an invalid SE solution or an SE solution with non-trivial residuals. Some network parameter and model errors, like an incorrect transformer tap or an analog measurement with flipped sign, can...
The auxiliary line loss management system in Hebei grid is developed. The data of system are taken from EMS. After getting data from EMS, state estimation will be carried out periodically. The ground state of power flow is from the results of state estimation. The hardware configuration of system is introduced. A data receiving server is configured to receive model, graphic and data in auxiliary line...
On the basis of studying the real-time database technology, combined with CC-2000A system of Kedong company, the CASE management functions is being developed, which improved the history data processing method in the real-time database of SCADA (Supervisory control and data acquisition systems). It can achieve the goal of preserving, recovering and deleting the entities of real-time database, graphics...
This paper describes a laboratory setup as the scaled model of a three substation power system. The scaled model has been developed at the Power System Control and Automation Laboratory of Georgia Institute of Technology. Elaborate physical models for the power system components along with high fidelity models for signal generation and interfacing to the laboratory setup are among its unique features...
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...
This paper presents a cost effective approach, using special-purpose hardware implemented using field programmable gate arrays (FPGA) - commodity programmable hardware, to accelerate the performance of key components of an energy management system (EMS). These components include state estimation, optimal power flow, and load flow computation. All of these components have at their core the solution...
Ontario market system created more stringent requirement on state estimator that support not only the traditional EMS operation but also the real time and pre-dispatch market operations. This paper describes the key requirements for a state estimator in the market environment, functional enhancements implemented to achieve 99.6% availability, and operational experience with the state estimator software
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