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In this study, we analyzed the operational situation and cost for Tokyo Electric Power Company's service area by 2030, when a high penetration of variable renewable energy (VRE) sources will have been attained. Day-ahead unit commitment and real-time economic dispatch simulation were carried out by taking into account photovoltaic power yield forecasts and errors. The analysis allowed us to evaluate...
This paper presents a deterministic unified unit commitment and economic dispatch model that integrates storage devices in the short-term power system scheduling under high renewable energy penetration. The presented model is a single multi-hour look-ahead real time tool that uses multiple time resolution to reduce its computational requirements. Operating on a rolling basis, the decisions of the...
This paper presents a new locational allocation method for automatic reserves that accounts for both the transmission network security and balancing power aspects using a security-constrained multi-period AC optimal power flow formulation and co-optimization of reserves. The proposed method's novelty includes going beyond linear DC-based dispatch security models with fixed reserve requirements, employing...
Recent studies have shown that multi-step optimization based on Model Predictive Control (MPC) can effectively coordinate the increasing number of distributed renewable energy and storage resources in the power system. However, the computation complexity of MPC is usually high which limits its use in practice. To improve the efficiency of MPC, in this paper, we apply a distributed optimization method...
The AC optimal power flow problem is a non-convex optimization problem that is difficult to solve quickly and reliably for large-scale grids. To enable the application of efficient and robust solution algorithms, various linear approximations of the nonlinear system model are used. However, this may lead to solutions that are AC suboptimal or even infeasible. This paper proposes new linearization...
Nodal pricing or LMP is one option to deal with congestion in the distribution grids that are expected due to the emergence of electric vehicles. When optimal power flow (OPF) with losses is used to determine optimal dispatch and locational marginal prices (LMP) of a power systems, the prices include marginal losses. Marginal losses are double the amount of the real physical losses. This leads to...
The main idea of the paper is to provide a detailed analysis of market set-ups in Europe, North America and Australia as well as to define obstacles and potentials for full market integration for renewable and distributed energy resources. Comparing rules and market operational principles from different continents, elaborated through examples of most evolved markets, indicates how different technologies...
With the introduction of more and more renewables into the power system both the inertia and the primary frequency reserves are expected to decrease. It is therefore a growing concern that the frequency quality will deteriorate. One way of mitigating these problems may be a more detailed monitoring of the generators providing the primary reserves. A promising approach for monitoring the generators...
Current models of capacity market designs in the U.S. and elsewhere ignore the important issue of carbon emission produced by power generators. While the current designs may produce optimal and efficient capacity market prices, these designs contribute little or nothing to reduce such emission. In this paper, we present a novel alternative to the current capacity market design which can realistically...
Modern society is inextricably linked to the use of electric energy in many areas of his life and activities. The fleet is no exception, which is equipped with electrical items of various complexity. Currently, hundreds of thousands of commercial, fishing, passenger and other ships are operational and perform their functions. Further progress in the field of shipboard electrical equipment is closely...
Nowadays, diesel and turbo-generator sets operated with a constant speed are most widely used as marine power sources. Advantages of standard generator sets include a relatively high efficiency. When generator set is operated as a part of the unified electric power grids with an electric propulsion system and load varying within a wide range, efficiency and reliability of a standard generator set...
In recent years, semiconductor converters are widely applied in marine electric power systems. Semiconductor converters are used in ship electric propulsion systems consisting of shaft generator units, a variable frequency drive, and alternators. The use of semiconductor converters results in decrease of power quality in ship networks, in particular, in an increased ratio of non-sinusoidal voltage...
This paper presents the development and characterization of an electric power generator device using a piezoelectric material made of Lead Zirconate Titanate (PZT). The device was built like a mechanical structure in which were coupled eight piezoelectric cells subjected to cyclical loads of traction and compression, which work as electricity generator. For the experimental characterization, a system...
With blossoming of wind power generation in the grid, many system operators recognize the requirement for additional flexibility to accommodate the variability and uncertainty from wind generation. Because of the high penetration of wind power, power systems are facing great operational challenges in maintaining generation balance. This study reviews the system flexibility requirement in a high wind...
To enhance the reliability of the power system, newer technologies are being incorporated day by day. Predictions of different states can significantly increase the reliability of the system. To predict the frequency, a cellular computational generalized neuron network (CCGNN) that is trained with particle swarm optimization (PSO) is proposed recently. However, with the size of the system, the dimension...
Transmission line switching is an important operational action in power transmission systems, and has been successfully applied to reduce generation costs and eliminate congestions. Prior work mainly focus on tackling the Optimal Transmission Switching problem based on steady states. This paper studies how to generalize these results when transmission switching is performed on highly congested systems...
This paper presents an online distributed control design for suppressing inter-area oscillations in large power systems under structural constraints posed on the underlying communication network. The presence of multiple clusters of generators in a power system results in several inter-area oscillation modes. By modal analysis, we first show that the contribution of each inter-area mode on the electromechanical...
This paper considers the problem of optimally dispatching a set of generators in a power system; these generators are interconnected to some loads via a network of buses. We consider scenarios when the power network is operating at a steady state, and a small change in the load occurs at some of the load buses. Upon occurrence of this event, the network seeks to find the change in generator injections...
This paper focuses on securely estimating the state of a nonlinear dynamical system from a set of corrupted measurements. In particular, we consider a wide class of nonlinear systems, and propose a technique which enables us to perform secure state estimation for such nonlinear systems. We then provide guarantees on the achievable state estimation error against arbitrary corruptions, and analytically...
State of power system is often determined by taking simultaneous measurements across the grid. However, in developing countries with geographically expansive grid, if the measurements are not GPS time-stamped there are latencies owing to distance of sensor from control center or communication system performance. The latency and resulting time-skews in data fed as input to state estimator program may...
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