Author
Dariush Shirmohammadi
Bio: Dariush Shirmohammadi is an academic researcher from Pacific Gas and Electric Company. The author has contributed to research in topics: Control reconfiguration & Electric power transmission. The author has an hindex of 4, co-authored 4 publications receiving 378 citations.
Papers
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TL;DR: In this paper, the authors describe the principles and the implementation of a methodology to evaluate the transmission network capacity use for firm transmission services including wheeling transactions, and demonstrate that this methodology, called the MW-mile methodology, is more reflective of the actual usage of the transmission networks in allocating the transmission capacity cost than the now widely used postage stamp rate procedure, and also indicated the potential for realizing greater economic efficiencies through the use of this methodology.
Abstract: The authors describe the principles and the implementation of a methodology to evaluate the transmission network capacity use for firm transmission services including wheeling transactions. In this methodology, transmission network capacity use of a transaction is a function of the magnitude of electric power, the length of the transmission lines, and the type of facility involved in the transaction. This capacity value provides an equitable means of allocating the cost of transmission facilities among users of the firm transmission service. Through examples, it is shown that this methodology, called the MW-mile methodology, is more reflective of the actual usage of the transmission network in allocating the transmission network capacity cost than the now widely used postage stamp rate procedure. Also indicated is the potential for realizing greater economic efficiencies through the use of this methodology. >
219 citations
TL;DR: In this article, an accurate dynamic induction motor model was developed from a knowledge of standard specification data for the motor and the incorporation of the model into the Electromagnetic Transients Program (EMTP) was described.
Abstract: A method is presented by which an accurate dynamic induction motor model may be developed from a knowledge of standard specification data for the motor. The incorporation of the model into the Electromagnetic Transients Program (EMTP) is described. Examples are given of its use in the study of the starting performance of a large induction motor and of the response of the same motor following various electrical faults.
83 citations
TL;DR: In this article, the performance of semi-conductive glaze post insulators was evaluated in HVDC field trial programs and natural wind and rain washing effects on different profiles with conventional glaze.
Abstract: improved contamination performance for HVDC and HVAC. 5. For the range of post diameter tested, the difference in HVDC contamination performance appears to be insignificant considering the spread in results. 6. HVDC field trial programs are planned to study the performance of semi-conductive glaze post insulators and to study natural wind and rain washing effects on different profiles with conventional glaze. Discusser:W. D. Lampe
68 citations
TL;DR: In this article, a multi-attribute auction framework for the procurement of future resources is presented, which uses the attributes of capacity and energy price, dispatchability, location, start date flexibility, price diversity, project viability and environmental impacts to evaluate customer benefits.
21 citations
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01 Jul 1996
TL;DR: In this article, a new method of tracing the flow of electricity in meshed electrical networks is proposed which may be applied to both real and reactive power flows, and a loss-apportioning algorithm has also been introduced which allows the break down of the total transmission loss into components to be allocated to individual loads or generators.
Abstract: Continuing trend towards deregulation and unbundling of transmission services has resulted in the need to assess what the impact of a particular generator or load is on the power system. A new method of tracing the flow of electricity in meshed electrical networks is proposed which may be applied to both real and reactive power flows. The method allows assessment of how much of the real and reactive power output from a particular station goes to a particular load. It also allows the assessment of contributions of individual generators (or loads) to individual line flows. A loss-apportioning algorithm has also been introduced which allows the break down of the total transmission loss into components to be allocated to individual loads or generators. The method can be useful in providing additional insight into power system operation and can be used to modify existing tariffs of charging for transmission loss, reactive power and transmission services.
781 citations
Journal Article•
TL;DR: The goal of this paper is to promote better load modeling and advanced load modeling, and to facilitate data exchange among users of various production-grade simulation programs.
Abstract: The authors recommend standard load models for power flow and dynamic simulation programs. The goal of this paper is to promote better load modeling and advanced load modeling, and to facilitate data exchange among users of various production-grade simulation programs. Flexibility of modeling is an important consideration. For transient stability, longer-term dynamics, and small-disturbance stability programs, the authors recommend the structure of multiple load types connected to a load bus. Load types are static including discharge lighting, induction motors, synchronous motors, and transformer saturation. For each load type, multiple models may be connected to the bus. For longer-term dynamics programs, a model for LTC transformers is also recommended.
561 citations
TL;DR: In this article, the authors proposed a simple method of transmission supplement charge allocation based on topological analysis of power flows in the network. But the method uses the MW-MILE methodology but analyses the share, not the impact of, individual loads and generators in line flows.
Abstract: This paper introduces a simple novel method of transmission supplement charge allocation based on topological analysis of power flows in the network. The method uses the MW-MILE methodology but analyses the share, not the impact of, individual loads and generators in line flows. This results in positive contributions from all the users hence rescinding the problem of counterflows.
454 citations
TL;DR: In this paper, a new simulation tool named EMTP-RV is presented, which uses a new matrix formulation for computing load-flow, steady state and time-domain solutions and an open-architecture graphical user interface (GUI) is developed to maximize flexibility and allow creating and maintaining complex designs.
433 citations
TL;DR: A typology for this broad class of models is offered, some of the types of problems that may be analyzed with these methods are suggested, and the implementation of several MCDM methods in currently evolving IA frameworks are recommended.
306 citations