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With increased penetration of renewable energy sources in the bulk electricity system, it is important for power system planners and operators to maintain grid stability and carry out system impact studies for identifying reliability-related problems. Adequate models have been developed by the industry to represent positive sequence response of solar PV plants for grid interconnection studies. In...
The following paper presents a modular system for active power support in wind generators. It works on the base of a Flywheel Energy Storage System (FESS) coupled to the DC link of a medium voltage back-to-back multilevel converter. Two ANPC-5L compose a full-scale converter interface and a third converter tied to the DC link drives a flywheel through an induction machine. All converters have predictive...
The Transmission Expansion Planning (TEP) is still a highly complex, combinatorial, non-linear and non-convex problem, where more accurate models and more efficient optimization tools are needed. The purpose of this work is to solve the static Transmission Expansion Planning (TEP) problem through the Biogeography Based Optimization (BBO) technique using an AC model, for the simultaneous expansion...
A crude oil production and shipping terminal was built and expanded over time such that the facility was powered by three isolated power systems. These separate plants have since been interconnected to permit the sharing of generation reserves. Initially, the interconnected system was supervised by a power management system (PMS) that relied on isochronous operation of one power plant for frequency...
The Internet of things (IoT) will make it possible to interconnect and simultaneously control distributed electrical loads. Various technical and regulatory concerns have been raised that IoT-operated loads are being deployed without appropriately considering and systematically addressing potential cyber-security challenges. Hence, one can envision a hypothetical scenario when an ensemble of IoT-controlled...
The problem of regulating voltages within the required limits is complicated by the fact that power system supplies power to a vast number of loads and is fed from many generating units. As loads vary, reactive power requirements of the transmission system vary. Moreover, voltage magnitude is relatively less sensitive to active power compared to reactive power due to high X/R ratio of transmission...
Reactive power and voltage support is an essential service to ensure secure power system operations. Low voltages in the transmission grid pose threat to operational security of the grid. Certain control areas in the Southern regional grid in India experience severe low voltages during peak demand period. This paper provides an overview of the different methods being used by the grid operator to access...
This paper presents secondary voltage control of power grid using identification of voltage stability index and voltage control areas. Unlike, the traditional secondary voltage control in North America performed directly by switching capacitor banks and other reactive power sources, in the proposed approach generators are chosen first to perform secondary voltage control. The participation of generators...
This paper introduces a metaheuristic Intervention Scheme Based Mean Variance Mapping Optimization (MVMO-IB) algorithm for solving the Optimal Reactive Power Management (ORPM) problem. The intervention scheme, objectives and constraints used in the MVMO-IB have been derived through surveys conducted at transmission system control center and are supported using literature. Contingency analysis feature...
Photovoltaic generators can provide several benefits for distribution networks, such as power loss reduction, and improvements in voltage level. However, high penetration of these generators can cause voltage rise problems in the distribution network. In this way, voltage control strategies are necessary so that the voltage levels are within the range of operation for any load and generation conditions...
The aim of this work is to evaluate the impact of the incorporation of dynamic voltage support and reactive power injection requirements in PV systems connected at Provincial Interconnected System(PIS) of San Juan-Argentina projected up to the year 2024 under different levels of penetration. To this aim, the calculation of a severity indexes is proposed. It can be concluded that the capacity to withstand...
A liquefied natural gas facility in the United States is being expanded to allow liquefaction of natural gas and export of liquefied natural gas while keeping intact the existing import facilities. This means adding more loads and steam-based generation to the existing gas turbine generator portfolio. The upgraded system will feature six gas turbine generators and two steam turbine generators in an...
A recent report from the German Energy Agency analyzes the possible introduction of the blockchain technology in energy transactions in power distribution. The issue deserves attention since the extensive digitalization of business models puts new challenges to utilities in the power sector. The German decision makers in the energy field claim that blockchain appears as a close perspective and, at...
This study focuses on one of the main concepts regarding strategies to be adopted to reach the European policy targets, regarding Green House Gas emissions (GHG). The subsidization of renewable energy sources showed its limits, due to the fact that such power plants can create several problems to the power grids they are connected to, and for this reason the implementation of new or more advanced...
In order to improve the power quality of wind power generation system, a direct power control (DPC) strategy of open-winding brushless doubly-fed generator (BDFG) system based on dual converters is presented in this paper. The control method is divided into two parts: the grid side converter control and the machine side converter control. In terms of the grid side converter, a model predictive-based...
This paper presents a method to shed off the least important loads in a microgrid operated at constant frequency under the contingency of inadequate power generation. Different from conventional frequency deviation based load shedding, this paper discusses in detail how to shed off load based on the voltage deviation. The key issue is to differentiate whether the voltage deviation is due to sudden...
In this paper, a class of coordination control problems of power system in distribution networks is addressed. The multiple photovoltaic generators (PVs) in network are expected to be operated in a certain level, namely Fair Utilization, in order to provide reliable power of high quality. In other words, the occupancy ratios of all PVs that are determined by the current active and reactive power outputs...
Solar voltaic panels are getting common as a micro grid energy source day by day. Ample requirement of power quality improving devices are there in the grid. The scenario gives rise to a question that how we can avail more power quality improving devices, like static reactive power compensators by effective utilization of available devices. All the grid connected solar plants requires a three phase...
The Cretan power system is the largest autonomous power system in Greece, and it consumes around 5% of the total Greek electricity demand. It contains a large number of conventional power stations that are combined with significant installed capacity of wind farms and photovoltaics. This paper is evaluating the effect of a large wind-hydro hybrid power station installation in this system. The analysis...
The application of technologies for the improvement of voltage stability, particularly during contingencies is a major concern in the field of power networks operation and control. In this paper it is studied the FACTS performance in the dynamic voltage stability of an electric power system. It was considered the influence of two FACTS controllers in parallel or shunt connection, the Static VAR Compensators...
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