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Trico Electric Cooperative Inc (Trico) is a nonprofit cooperative serving more than 38,000 rural customers in southern Arizona. Trico is challenged with managing a distribution system with a wide geographical dispersion. Trico required a system to centralize, control and manage access to all of its substation devices and related data. Trico sought to diversify available substation information and...
This paper describes the objectives of the Working Group (WG) on Test Systems for Economic Analysis of Power Systems, and presents the current activities of the WG as well as the future plan.
The aim of the present paper is that of assessing the role of the transmission system in a liberalized electricity market, pointing out that the presence of transmission capacity limits may influence the market outcomes and above all it may make profitable a strategic behaviour rather than a competitive one by one or more producers. From this point of view, the transmission system development becomes...
Interior point method (IPM), as one of the most efficient methods, is being extended to solve different types of optimization problems in electric power domain. In this paper, the nonlinear OPF problem, formulated with a rectangular coordinate form, is solved using the enhanced multiple predictor-corrector interior point method, which is combined with the selection of the optimal composite direction...
A methodology to solve the network expansion planning problem considering N-1 security criterion is proposed. The main idea to achieve the desired results is to separate the whole problem into two subproblems and solve them iteratively. The aim of upper level problem is to solve the mixed-integer programming model with all identified constraints. For the lower level problem, all N-1 contingencies...
Ensuring system reliability and security while operating electricity markets is the primary responsibility of independent system operators. Maintaining system security in real-time is a significant challenge due to limited time frame permitted for analyzing and responding to security issues. This paper focuses on the applications designed to address static security in the real-time operations of ERCOT...
In this paper, an enhanced congestion control scheme for market related applications is presented. Based on the concept of Marginal Value Expansion, violated transmission constraints can be handled more effectively in the optimization process. Compared to the traditional congestion control method, available resources in system can be utilized more sufficiently. The effectiveness of the new scheme...
Summary form only given. The paper presents that smart microgrid could offer a perfect power system with higher reliabilities which could guide customers to lower their costs and utilize electricity more efficiently. The task of improving the efficiency and upgrading the resiliency of the electric grid, in order to support clean and renewable energy, is one we cannot let be exported or delegated overseas...
This paper presents an efficient security assessment system for validating power system operation planning, which has been used in Henan provincial power grid in China. Daily operation planning is to schedule unit commitment and to dispatch generator output economically considering next day generators and transmission components' maintenance planning. The security assessment for validating the daily...
The smart grid concept was introduced to the US utility industry by the Department of Energy (DOE). It was based on the visions of DOE's Grid 2030 and National Electric Delivery Technologies Roadmap. The debate over what constitutes a smart grid is still emerging. Nevertheless, we all agree that smart grid concept is complex and contains many interdisciplinary technologies and strategies. It is difficult...
This paper presents an early warning and preventive control system for dynamic security, which has been used in several provincial power grids in China. The framework and the main modules of the proposed system are introduced. The system architecture is based on a Multi-agent system which is developed by our team. The modules like on-line contingency assessment, total transfer capacity evaluation,...
This paper presents the practical experience of the Brazilian System Operator with the online dynamic security assessment. More specifically, it describes the adopted models, analytical methods and functions, performance, EMS integration, user interface and implementation issues. Examples of situations in which the online security assessment was very useful are also shown.
A method to determine the coordinated operation of power electronics equipment in extra-high voltage networks is described. The method can be used for evaluating network expansion scenarios that use power electronics equipment. At first, the load flow is simplified by using node-branch and branch-branch sensitivities. With these sensitivities a linear problem is defined and used to determine solutions...
Security constrained optimal VAR despatch using 3500 bus Great Britain transmission planning models is investigated in this paper. The investigation demonstrates the value of applying practical reactive branch flow constraints to generator transformers in order to limit the pre-fault reactive utilization. This research also demonstrates that a multi-staged optimization approach can be used to remove...
Advances in technology and major programs to enhance the electric power system throughout the world have led to the concept of the “Smart Grid”. This concept has been formally defined in various places and is driving many of the current changes in educational curricula at all levels. This paper provides a brief summary of the known definitions and the resulting educational needs for the technical...
The complex system architecture required to support smart grid technology introduces an undetermined level of risk in power systems. Many current techniques to evaluate cyber specific risk fail to scale to such a large environment. While attack graphs and trees are frequently used to model system security, both approaches require the ability to predict potential attack vectors. Access graphs have...
The simultaneous feasibility test (SFT) performs the network sensitivity analysis under the base case and contingency cases in power systems. This paper presents the practical implementation of the simultaneous feasibility test in the energy market. SFT calculation includes loss sensitivities and constraint shift factors either for E-nodes or P-nodes and the used reference is the distributed load...
The growth and loading of today's power system needs more elaborated tools to monitor the system security in order to find countermeasures in case of system insecurity and instability. Studying system security refers to analysis of system voltage, transient and small signal stability. The paper will combine a set of indexes for the overall system behavior ranking small system behavior, transient stability,...
Methods for the assessment of the dynamic network security, with regard to the installed protection system, are introduced. Currently, an accordant online system is under development together with European Universities and European Transmission System Operators. Here, the purpose is the observation of the security of the overall system, consisting of primary network and the superimposed interacting...
A communication system plays an important role in SCADA system, and various communication media have been applied to meet the SCADA system's objective. Wireless communication becomes an attractive option as communication network in some cases, such as small amount of data communication for extremely remote substation, remote debugging temporarily for newly-built generation plants and backup communication...
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