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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...
The rapid increase in installed distributed generation (DG) has led to concerns about the impact on the proper operation of the protection system. In particular, the limited fault current capability of inverter interfaced distributed generation (IIDG) could lead to malfunctioning of the distribution network protection system which largely relies on overcurrent based protection techniques. The absence...
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...
This paper proposes a new pricing mechanism and dispatch model for reactive power service from distributed generation (DG) resources, including wind turbines and solar photovoltaic plants, connected to a low voltage distribution system. Novel cost functions of reactive power service are proposed for DG resources as well as alternative VAR suppliers such as STATCOM and capacitor banks, taking into...
Distribution Systems traditionally have a tree-like structure with several branches. They supply loads that vary through the day and as a result, some branches are loaded more than others are. By reconfiguring the system, loads from the overloaded branches may be moved to under-loaded branches. Consequently, loads in the branches can be balanced so that the real power losses are reduced and the voltage...
Deregulated electricity markets in the U.S. currently minimize total bid costs to select bids and their generation levels but determine payments based on market clearing prices. The inconsistency between auction and settlement mechanisms can lead to a significantly higher consumer payment. This gives rise to the “payment cost minimization,” an alternative auction mechanism that minimizes consumer...
The application of simple fuzzy power systems stabilizers (SFPSSs) to enhance the damping of inter-area oscillations of the Mexican Interconnected System (MIS) is presented. In particular, the work is focused on improving the damping of one of the most critical oscillation modes of the MIS: the north-south inter-area mode. The SFPSSs used in this work are characterized by a significantly reduced fuzzy...
This paper describes research in progress for a panel session presentation on how phasor measurement unit (PMU) values can be used to improve power system operations beyond their use in state estimation.
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...
This paper discusses a study funded the California Energy Commission (CEC), performed by New Power Technologies with Southern California Edison to validate a system-wide, distribution element-level (high definition) power system simulation using field measurements. Comparisons of system simulation results and field measurements showed that the simulation is a statistically significant predictor of...
Improvements in transmission and distribution networks can be noticed in most countries that had their system architecture changed by the deregulation process. In this new environment one of the biggest challenges is the transmission and distribution open access. In Brazil, the National Electricity Regulatory Agency has established that the monthly amount of transmission system usage contracted by...
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...
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 inherent variability and uncertainty of wind power generation is a major issue for countries attempting to harness large quantities of wind-based renewable energy. Such properties of wind make optimal balancing of demand and generation a much more complex task. Clearly the flexibility of thermal plant in the electrical power system is of key importance, especially in smaller systems with high...
Voltage Stability Analysis has become more important as a result of insufficient reactive resources in bulk transmission systems. Usually the objective of Voltage Stability Analysis is to identify the weak regions in terms of reactive power deficiency and determine the critical contingencies and voltage stability margins for various power transfers within regions. This paper presents a practical method...
In this paper a fast, practical maximum loading point (MLP) calculation method is presented. The calculation process is based on the properties of the normal vector to the feasibility boundary computed close to MLP, which is calculated through a load flow method with step size optimization (LFSSO). Moreover, a practical procedure is added to the overall calculation process to include the operator's...
This paper presented a new approach to address the frequently encountered Standing Phase Angle (SPA) reduction problem during a power system restoration process. The proposed method was based on a modified Genetic Algorithm (GA). The problem of the SPA reduction was modeled as a mixed discrete-continuous optimization problem with various constraints. The objective function that needed to be minimized...
The electric power industry is and will continue to be a primary focus of existing and future greenhouse gas (GHG) emissions regulations. Different from other air pollutant regulations such as sulfur dioxide (SO2) and nitrous oxides (NOX), GHG regulations have the potential to significantly affect electric power system dispatch and operations soon, so the implications are significant enough to warrant...
Summary form only given. Increasing connection of variable distributed generation, like wind power, to distribution networks requires new control strategies to provide greater flexibility and use of existing network assets. Active Network Management (ANM) will play a major role in this but there is a continuing need to demonstrate the benefit in facilitating connection of new generation without the...
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