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This paper is focused on the improvement of the grid current at the point of common coupling of a three-phase grid connected photovoltaic system supplying a non-linear load. This improvement is achieved by using the PV inverter as a shunt active power filter in addition to its main function of power injection in the grid. The shunt active power filtering is performed to compensate the disturbing grid...
In this paper, a DC-DC buck converter using a multi-bit (two-bits) delta-sigma modulator to control segmented output switches of the converter is proposed to enhance its efficiency and improve its output ripple. This converter operates in continuous condition mode (CCM). Here, the two output bits of the modulator control the switching of the main and the supplementary switches. The circuit is simulated...
This paper studies how to determine an optimal order of recovering interdependent Cyber Physical Systems (CPS) after a large scale failure. In such a CPS, some failed devices must be repaired first before others can. In addition, such failed devices require a certain amount of repair resources and may take multiple stages to repair. We consider two scenarios: 1) reserved model where all the required...
In this paper is presented an algorithm for estimating the wind speed by solving the non-linear model of a wind turbine (WT) using the Newton Raphson iterative method. The wind speed estimations obtained are used for computing the WT generator speed that maximize the extraction of wind power. This optimum generator speed is used as reference for the speed controller of a permanent magnet synchronous...
In this paper, a new single-phase multilevel inverter topology suited for distributed DC sources is proposed. The proposed inverter is comprised of a voltage-level generator connected in series to the input of the classical H-bridge. The voltage-level generator is only able to generate positive DC voltage levels at its output. The H-bridge is used to generate the negative and zero voltage levels....
Wind power plant installations continue to increase worldwide because it is a kind of renewable and harmful emissions-free energy source. The increased capacity of wind power needs the new strict requirements related to the grid connections of wind generators. The requirements defined in the grid codes can be states as reactive power control, fault ride-through (FRT) capability of the wind turbines,...
In this paper the authors present an analysis of the command with rectangular (trapezoidal) printed currents of a permanent magnet synchronous motor (PMSM) for driving a bicycle. Constructive details and materials are presented. It also presents the results obtained from numerical simulations of the studied permanent magnet synchronous machine for its operating as a generator. In this operating regime,...
In view of the condition and demand of HulunBuir power grid, it could play an important role in enhancing its restoration speed to find or build new power source applied for black-start. Firstly, a black-start scheme is proposed for it, in which the East Hailar Thermal Power Plant in Hailar district can be started through using the Daliang wind farm configured with high-capacity battery energy storage...
Blind recognition of error correcting code over GF (2) have been studied intensively in past few years, however, few works have been involved the case of non-binary codes. In order to approach the problem, a novel method for blind recognition of Reed-Solomon (RS) codes is proposed in this paper, which is based on Galois Field Fourier Transform of code polynomial. Moreover, theoretical analysis of...
This paper addresses the issue of selecting architecture of smart grid that can be used so as to test applications and uses cases related to services. Most existing architectures are based on the NIST conceptual model that defines seven high-level domains (Bulk Generation, Transmission, Distribution, Customers, Operations, Markets and Service Providers), which is not suitable with recent progress...
CISPR25 is the reference standard in the automotive industry for performing radiated emissions measurements in a semi-anechoic chamber. Significant differences can be observed between different CISPR25-compliant laboratories when measuring emissions on the same device under test. In this paper, these differences are evaluated through an interlaboratory comparison across 17 laboratories, with a special...
The paper presents a comparison of the power output of wind driven generators coupled to active and passive converter circuits at certain site in Bulgaria. A table compares the power output difference expressed in percent. Actual wind resource data gives the opportunity to have evaluation and analysis at three different heights. Advantages of active and passive control are derived and summarized....
This paper deals with energy and economic analysis of grid-connected photovoltaic (PV) systems with storage. According to the current Italian market rules, the first goal is to calculate the capacities of PV systems and batteries corresponding to the cost-optimal solution. Then, cost-effective solutions are investigated to maximize self-consumption, minimizing grid injections. Simulations are performed...
In this paper are presented the simulation results of the locomotion of MECABOT, a Modular Robotic System designed and developed in the Militar Nueva Granada University. A Webots controller file is developed starting from the equations that describe the movement of MECABOT chain architecture, considering the caterpillar and snake configurations. The variation of the parameters of the equation in the...
This paper describes under frequency based islanding scheme of the Rawatbhatta Atomic Power Plant (RAPP) situated in Rajasthan. The islanding power system consists of seven generators having total 780 MW generation capacity. On the basis of simulation studies, under frequency based islanding scheme have been designed. Under frequency based islanding relays are placed at interconnecting points. Further...
This paper deals with the creation of models to simulate the signal contours of multiple-input multiple-output (MIMO) processes. The simulated signal contours are synthesized by a wavelet-based generator. The parameters necessary to adjust the contour generator are predicted from the machine settings. The predictor coefficients for the generator parameters are estimated from a set of designed experiments...
Gain scheduling for the widely-used NREL 5-MW proportional-integral blade pitch controller can be implemented either by the original documented method (Integrate First): integrate the generator speed error before multiplying by the gain-scheduling correction factor, or the Multiply First method: multiply the generator speed error by the gain-scheduling correction factor, then integrate. The results...
Decoding of Raptor codes consists of decoding of both the LT part and the precode part of the codes. When LT decoding is performed, a scenario may arise where the message passing-based decoding process is unable to provide non-zero log-likelihood ratio (LLR) updates to a fraction of input symbols even if it is mathematically possible to do so. The problem is even more critical for codes with short...
This article presents a case study and comparison of simulations carried out by SimPy 3.0 of Python module and OMNeT++ tool to explore the performance. The target of this comparison is in particular configuration of network for future steps what tools would be good to use. Two simple models of a network were created with Python and C++ language.
Some aspects of simulation of the energy systems for full-scale mode simulator, staff training and teaching in order to develop its skills of complex accidents rapid elimination at the Ukrainian power supply systems are considered.
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