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This paper is intended to introduce the project Energy4Growing that aims at studying and setting up a hybrid micro-grid to supply power to a school in rural Tanzania. It describes the results of the early project actions which concerned in: (i) analysing the actual school power supply system through locally metered data; (ii) developing the first step of a new electro-mechanical model which addresses...
We propose a likelihood ratio based physical-layer technique for detecting and mitigating the false data injection attack in cooperative communication systems. We present the optimum detection method that minimizes the end-to-end outage probability and the minmax detection method that minimizes the maximum possible outage probability under unknown attack probability. We show that the optimum detection...
Increasing photovoltaic (PV) penetration is a major driver for developing new methods to integrate renewable generation into distribution systems. For planning of low voltage distribution networks future share of penetrations have to be modeled in an appropriate way, to simulate and analyze the impact of PV generation. Different approaches to model high penetration scenarios - in particular defining...
As one of the Vs defining Big Data, data velocity brings many new challenges to traditional data processing approaches. The adoption of cloud environments in complex event processing (CEP) systems is a recent architectural style that aims to overcome these challenges. Validating cloud-based CEP systems at the required Big Data scale, however, is often a laborious, error-prone, and expensive task....
The recent trend towards accommodating more distributed resources in power systems motivates a transition from the current highly centralized control structure to a more distributed control structure. In this paper, we propose an asynchronous iterative distributed solution approach for the DC Optimal Power Flow problem. This approach constitutes an iterative procedure that solves first order optimality...
The knowledge of the mathematical models of ocean currents and of power coefficients is necessary for a complete marine current generator systems modeling. Review of these models is the topic of this paper. For any of the listed marine current mathematical models, simulation results of marine current velocity as a function of time is presented. Also, using the mathematical model of ocean currents...
The paralleling of synchronous generators is one of the main and frequently implemented power system control tasks. The significant importance of automatic implementation of this task is determined by the need of fast and reliable restoration of an electrical power system (EPS) after emergencies. The value of this task has been dramatically increasing during the last years with the growth of the penetration...
This paper shows that the flux-decay model of a synchronous generator exhibits the property of differential flatness. Differential flatness will be utilized for planning the generator's trajectory as there is a one-to-one correspondence between output curves and trajectories for states and inputs. Flat outputs of the generator are taken to be the generator's complex current injected into the power...
Polar codes have emerged as the most favorable channel codes for their unique capacity-achieving property. To date, numerous approaches for efficient decoding of polar codes have been reported. However, these prior efforts focused on design of polar decoders via deterministic computation, while the behavior of stochastic polar decoder, which can have potential advantages such as low complexity and...
Switched reluctance starter/generator has stronger competition ability in the hybrid system by reason of the large starting torque, easy to switch from electric to power, high power density, wide speed range, high efficiency, high reliability, low cost, etc. In order to improve the performance of switched reluctance starter/generator system, the master switch angle is needed to optimize. In this paper,...
This paper outlines procedures and experience the author had on commissioning and field tuning ABB Unitrol P AVR and PSS of a 160 MW steam turbine. Field measurements are provided in the paper for demonstration of transient responses. In addition, UEL verification test was conducted and test method is described in this paper. Transient responses from computer simulations are also provided in this...
This paper deals with the analysis and design of controllers for speed control loops. Taking a steam turbine as an example the design of robust control systems and the examination of uncertain plant parameters will be carried out by graphically representing the controller and the plant parameters. The analysis of the plant and the controller design is supported by a power plant simulation system.
Quantum-dot Cellular Automata (QCA) is an emerging technology for nano-scale computing. There is an ever increasing demand for reliable data transmission over telecommunication networking systems. The researchers are focusing on developing nano-devices that can detect/check errors during information communication. In this paper novel 3-bit odd- and even-parity generators and checkers using QCA nanotechnology,...
In wireless communication systems like mobile or satellite network a specified band is allotted. Each network has its own allotted spectrum for safe and secure communication. Transferring secure data and receiving it is important and difficult task. Secure transmission of data needs to hide the message signals. Such security to message signal is provided by adding a random noise sequences to it, i...
In [3], we laid out the vision of a novel graph query processing paradigm, where visual subgraph query formulation is interleaved (or “blended”) with query processing by exploiting the latency offered by the gui. Our recent attempts at implementing this vision [6], [7] do not provide any robust framework to systematically investigate the performance of this novel paradigm. This is because it is prohibitively...
Conventionally, the frequency of the power system is controlled by matching the electric supply to the varying demand. Some recent studies demonstrated that demand response (DR) can contribute to the frequency control equally to the generating units. However, to a great extent, the performance depends on the controller design and parameter selection. In this paper, a comprehensive DR control scheme...
This paper focuses on black-start of power system with turbine based combined cooling, heating and power (CCHP) systems as start units. Firstly, the relation among inrush current, the capacity of CCHP systems and transformers are researched and summarized by building models and running simulations in PSCAD. Then three typical black-start cases are designed based on the distribution network, and simulation...
This paper introduces the project Energy4Growing which aims to set up a hybrid micro-grid to supply power to a school in rural Tanzania. It describes the results of the early project actions which concerned: (i) monitoring of the actual school power supply system; (ii) first step development of a new model which addresses the simulation of the electro-mechanical operation and dynamic behavior within...
Sustained load growth in electric power industry has resulted in intensive usage of grid assets including transmission system. Over the years, the transmission infrastructure is unable to evolve at the same proportionate which leads to diminishing reserve capacity in a transmission system. This leads to frequent congestions in the grid. Therefore, congestion management has become vital to maintain...
The expected increase in penetration of renewables in the upcoming decade urges the electricity market to introduce new products — in particular, flexible ramping products — to accommodate their variability and intermittency. While CAISO and MISO are leading the design, it is not clear how such products may affect the electricity market. There has been extensive works investigating the cost incurred...
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