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Due to recent changes in electric power system structure and market driven operational changes electric power system operation has increased in its complexity. Engineers and Energy Management System (EMS) suppliers are driven to enhance existing tools and add new tools for control room operators for consistent and faster decisions. Among the two well recognized quality indicators of electric power...
Negotiation of secure bilateral transactions has become an important issue for better operation, planning and management of competitive electricity markets. In this paper, secure bilateral transactions have been determined with minimum deviations in economic generation schedule and real power losses for hybrid electricity markets. The generation pattern and real and reactive power loss has been obtained...
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...
The deployment of plug-in hybrid vehicles (PHEVs) and micro-combined heat and power (μ-CHPs) technologies creates the opportunity for these units to be optimally operated under various control schemes to enhance electric grid operation. In addition, if vehicle-to-grid (V2G) and thermal storage features are considered, these embedded technologies could have even a greater impact on network performance...
In this paper a method for optimal placement of Static Var Compensator (SVC) to maximize power system loadability is presented. The method is based on mixed integer linear programming (MILP) and line flow based equations are used in the formulation. This proposed method has the ability to not only determine the location and settings of SVCs, but to minimize the required compensation as well. The method...
This paper proposes a level playing field for the supply of reactive power ancillary services, wherein not only synchronous generators, but other providers of reactive power are also paid for their services. An Optimal Power Flow (OPF)-based reactive power dispatch model is proposed based on the reactive power payment mechanisms existent in Ontario. Novel cost models are proposed for Static VAR Compensators...
According to Japanese governmental target, more than 50 GW will be penetrated on the whole utility system until 2030. Such large penetration of PV system may cause deterioration of power quality and stability of the whole utility grid. CRIEPI is promoting a study of future Japanese style smart grid called “Triple I (Intelligent, Interactive, Integrated) Power System (TIPS)” to keep stable and to promote...
A new approach to solve the power flow problem based on graphic processing units is presented in this paper. A Newton method is implemented to solve the set of nonlinear equations of the power flow formulation. A parallel kernel for the biconjugate gradient method allows solving the voltage corrections on a graphic processing card. While the evaluation of the Jacobian matrix is carried out on the...
A new optimal power flow (OPF) model accounts for electro-thermal coupling relationship is established based on electro-thermal coordination (ETC) concept in this paper This new OPF model organically combines the traditional OPF with heat balance equation (HBE) which reflects thermal dynamic process of transmission component. It considers the temperature limit of transmission component as its security...
A new approach to harmonic state estimation is proposed by firstly classifying the network nodes into four types. Classification of a particular node into one of the four types is based on the availability or otherwise of node voltage and nodal harmonic injection current measurement at the node. Algebraic expressions to determine all the remaining unknown node harmonic voltages and nodal harmonic...
Preliminary results from an investigation on the application of dynamic power flow controllers to a stretch of the Qatar Transmission System (QTS) along the western coast of Qatar. The main objective of applying the power flow controller is to maintain balance of power flow between the networks or lines that supply to this weaker region of the QTS, and in turn support network security should the demand...
This paper adjusts decentralized OPF optimization to the AC power flow problem in power systems with interconnected areas operated by different transmission system operators (TSO). The proposed methodology allows finding the operation point of a particular area without explicit knowledge of network data of the other interconnected areas, being only necessary to exchange border information related...
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...
Unified Power Flow Controller (UPFC) has a promising effect on controlling the characteristics of the power system operation. During the contingency outage cases, the transmission lines are overloaded and the buses are subjected to voltage violations. Unified Power Flow Controller (UPFC) has both shunt and series controller effect inside its frame. This option gives the UPFC the power to control the...
Power system restructuring with high renewable energy penetration has created some new problems for reliability evaluation. One of the problems is the large computation time due to the increased number of renewable generators. In this regard, the reliability network equivalent techniques have been introduced to simplify calculation. These techniques are simpler than the conventional contingency enumeration...
Under standard approach, locational marginal prices (LMPs) are generally decomposed into system marginal (energy) price (SMP), marginal congestion cost (MCC), and marginal loss cost (MLC). However, earlier work has shown that it is not possible to separate the standard decompositions of LMPs into three mutually orthogonal subspaces. It is also found that MLC term of standard LMP inherently depends...
Locational marginal price (LMP) is a fundamental principle in the majority of electricity markets and is increasingly being employed at a number of ISO's such as PJM, california ISO, etc. It is essential to obtain the accurate value of LMPs. This paper presents an OPF formulation with a composite dynamic load models which is a composite of ZIP and induction motor loads. An improved locational marginal...
Smart Grid initiatives proposed by governments and industry organizations have the potential to support carbon mandates/targets. While the options and scope of the changes that might be deployed within the transmission and distribution system to respond to climate change initiatives, is not yet defined they options could include bi-directional power flow, the increased use of distributed variable...
In this paper, a sequential AC/DC power flow algorithm is proposed to solve networks containing Multi-terminal Voltage Source Converter High Voltage Direct Current (VSC MTDC) systems. In VSC HVDC technology, the converter losses add up to a significant fraction of the overall system losses. However, they are often neglected or not taken into account in a proper manner in VSC HVDC power flows. The...
Congestion management is one of the most important issues for secure and reliable system operations in deregulated electricity market. This paper presents a cost/worth analysis approach for optimal location and sizing of Distributed Resources (DRs) to mitigate congestion and increase security of the system. In order to reduce the solution space a priority of candidate buses is formed, then optimal...
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