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Journal ArticleDOI

Object methodology - techtorial

17 Jan 2005-IEEE Power & Energy Magazine (IEEE)-Vol. 3, Iss: 1, pp 18-29
About: This article is published in IEEE Power & Energy Magazine.The article was published on 2005-01-17. It has received 16 citations till now. The article focuses on the topics: Power system simulator for engineering & Power-flow study.
Citations
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Journal ArticleDOI
TL;DR: This study reviews the various control techniques and technologies that offset a decrease in inertia and discusses the inertia emulation control techniques available for inverters, wind turbines, photovoltaic systems, and microgrid.
Abstract: The utilization of power electronic inverters in power grids has increased tremendously, along with advancements in renewable energy sources. The usage of power electronic inverters results in the decoupling of sources from loads, leading to a decrease in the inertia of power systems. This decrease results in a high rate of change of frequency and frequency deviations under power imbalance that substantially affect the frequency stability of the system. This study focuses on the requirements of inertia and the corresponding issues that challenge the various country grid operators during the large-scale integration of renewable energy sources. This study reviews the various control techniques and technologies that offset a decrease in inertia and discusses the inertia emulation control techniques available for inverters, wind turbines, photovoltaic systems, and microgrid. This study attempts to explore future research directions and may assist researchers in choosing an appropriate topology, depending on requirements.

184 citations

Journal ArticleDOI
TL;DR: This paper discusses solutions to some of the challenges in storing and processing large power system network models as native Java objects without sacrificing reliability and robustness and addresses the issue of data processing performance in contrast to other approaches.
Abstract: The common information model (CIM) is an object-oriented representation of a power system and is used primarily as a data exchange format for power system operational control systems. CIM has the potential to be used as much more than an intermediary exchange language. This paper explores the possible use of CIM as the core of a power systems analytical toolkit for storing, processing, extracting, and exchanging data directly from CIM objects. To this end, this paper discusses solutions to some of the challenges in storing and processing large power system network models as native Java objects without sacrificing reliability and robustness. This paper highlights the advantages provided by such a system when dealing with extensions to the CIM standard and overcoming the problems posed with simultaneously maintaining backward compatibility without sacrificing a higher level of detail. This paper also addresses the issue of data processing performance in contrast to other approaches.

46 citations


Cites methods from "Object methodology - techtorial"

  • ...tecture instead of a custom-designed solution as has been used in other object-oriented power system applications [3] to allow...

    [...]

Journal ArticleDOI
TL;DR: This review paper gives an insight into the most important DN- and TS-oriented ASs foreseen to apply in future power systems and state-of-the-art on measurement-based analysis techniques that can be used to facilitate the provision of several ASs by providing in real-time critical information regarding system dynamic performance.
Abstract: Originally, ancillary services (ASs) were provided by large-scale power plants to ensure the secure and reliable operation of power systems. However, with the advent of renewable energy sources either in large-scale or as smaller distributed generation units, there is a strong need to revisit the structure and aim of traditional ASs and reconsider them under two main concepts; ASs provided to distribution networks (DNs), aiming to solve local issues at the distribution level, and ASs offered to transmission system (TS), targeting to solve issues having a wider impact on the power system. The former can be considered as DN-oriented ASs, while the latter as TS-oriented ASs. In this changing environment, the increasing installation of measuring infrastructure has created new sources of data, providing the opportunity to improve the performance of several ASs by applying measurement-based analysis. This review paper gives an insight into the most important DN- and TS-oriented ASs foreseen to apply in future power systems. Additionally, state-of-the-art on measurement-based analysis techniques that can be used to facilitate the provision of several ASs by providing in real-time critical information regarding system dynamic performance is presented.

31 citations

Proceedings ArticleDOI
20 Jan 2009
TL;DR: An architecture based on a novel topology processing method that enables power system planning software to precisely model real-time systems and be used in real- time operations is conceptually described.
Abstract: This paper describes a software tool that supports analysis and simulation of both planning and real-time systems using a single model and software environment. This has been a challenge to the power industry for decades, because during the seventies, distinct models, formats, and applications were assumed by planners and real-time operation due to technological and security reasons. This division continues to be a major limitation for business process integration, software innovation, and deployment of new power system algorithms in the industry. We conceptually describe an architecture based on a novel topology processing method that enables power system planning software to precisely model real-time systems and be used in real-time operations. Experience gained by testing this algorithm on largescale ISO models with several key power system applications is detailed.

9 citations

Journal ArticleDOI
TL;DR: The use of a unified network applications framework for planning contingency analysis capable of incorporating contingencies that involve arbitrary configurations of switching devices is proposed, providing full temporal interoperability between offline contingency analysis and real-time security assessment.
Abstract: Existing power system planning software is not capable of simulating large numbers of contingencies that involve bus mergers and bus splits without cumbersome modifications to planning models either manually or through scripting. This means that some of the events that can occur in a bulk power system are not studied in detail prior to real-time operation. This paper proposes the use of a unified network applications framework for planning contingency analysis capable of incorporating contingencies that involve arbitrary configurations of switching devices. The method handles any type of bus split or bus merger events automatically without requiring case conversion or modification. This drastically simplifies the tabulation of results of complex contingencies and makes potential unsecure system conditions visible during the planning stage. The efficiency of the algorithm is demonstrated in large-scale ISO models that incorporate full-topology switching modeling, and it is shown to be at least ten times faster than scripting. The proposed method hence supports direct comparison of planning and real-time grid security assessment evaluation, providing full temporal interoperability between offline contingency analysis and real-time security assessment.

8 citations

References
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Journal ArticleDOI
TL;DR: It is demonstrated that object-oriented technology, when applied to each stage of software development, can help achieve complicated tasks in power system simulations.
Abstract: The software systems developed for power system simulations have evolved into such complicated systems that the applied design practices appear inadequate to support further enhancement and maintenance. The major obstacles stem directly or indirectly from the conventional function-oriented software development methodologies. To overcome the drawbacks of these methodologies, this paper proposes applying an object-oriented technology for power system software development. As an illustration of this approach, the object modeling technique (OMT), an object-oriented software development methodology, is used to develop a distribution network analysis system. With this technique, a generic distribution circuit object model (DCOM) is designed based on the real-world concepts and implemented with object-oriented programming techniques. The developed DCOM is capable of supporting a wide range of distribution applications and allowing modification and maintenance over a long period of time. The performed case study has demonstrated that object-oriented technology, when applied to each stage of software development, can help achieve complicated tasks in power system simulations.

67 citations

Journal ArticleDOI
TL;DR: The design perspective provided in this article can be used for many applications, such as power system state estimation and optimal power flow (OPF), and the sparse matrix class can be developed further to include eigenvalue analysis.
Abstract: A sound design method is based upon a sound theoretical foundation, yet it offers degrees of freedom for artistic innovation. In the object oriented paradigm, the world is viewed as a collection of objects interacting with each other to achieve a meaningful behavior. The design perspective provided in this article can be used for many applications, such as power system state estimation and optimal power flow (OPF), and the sparse matrix class can be developed further to include eigenvalue analysis. As such, the architecture presented in this article is scalable.

25 citations

Journal ArticleDOI
01 Feb 1998
TL;DR: In this article, the authors examine the open system concept from the viewpoints of users and suppliers, and present current technologies for open distributed EMS/SCADAs and their possible future trends.
Abstract: Based on the current situation and emerging trends of development of EMS/SCADA systems throughout the world, this report examines the `open system' concept from the viewpoints of users and suppliers. Current technologies for open distributed EMS/SCADAs and their possible future trends are described.

20 citations

Journal ArticleDOI
TL;DR: An overview of an electric distribution management system that can support evolution and flexibility for customers in the 1990s and beyond is provided and the ability to evolve, system integration, and user-focused development are discussed.
Abstract: A system solution approach to information management for electrical distribution that meets the requirements being imposed by industry trends and the electric utility customer is presented. The approach is based on three significant phenomena in the computer industry: the replacement of traditional mainframe computer solutions with networked microcomputer and workstation solutions; the emergence of a standards-based software products industry; and the movement toward object-oriented software methodologies. The resulting technology enables the construction of generalized information systems that can evolve and be augmented over extended life cycles while containing maintenance and lifetime costs. An overview of an electric distribution management system that can support evolution and flexibility for customers in the 1990s and beyond is provided. The ability to evolve, system integration, and user-focused development are discussed. >

17 citations

Journal ArticleDOI
TL;DR: The use of object- oriented (OO) methods to develop expert systems and, in particular, the object-oriented expert system for the power system protective relay operation and management (OOPRES) are described.
Abstract: China is a developing country, and shortages in electrical power supply exist in most provincial power systems. Stability margins are always very limited, which requires operators to run the system carefully. With each change in either the power system configuration or operating conditions, a series of actions must be taken to guarantee the safety of the power system. The actions adopted for the protective relays include arranging protective devices appropriately and setting relays at their appropriate values for all elements involved. In addition, as power systems are developing very fast in China, the number of skilled operators available is far less than required. Expert systems are urgently needed. This article describes the use of object-oriented (OO) methods to develop expert systems and, in particular, features the object-oriented expert system for the power system protective relay operation and management (OOPRES). The article covers knowledge acquisition and representation, knowledge management, and inference engine.

10 citations