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Described in the article are the multiaccess systems on the basis of the algorithmic language BASIC, developed in the N.I. Lobachevski's Nizhny Novgorod state university in the period of 1969-1978. The first of them was the BASIC- batch-processing system that was introduced on an M-20 type ECM (BESM-3, BESM-4, M-220, M-222) in early 1970. It was actively used in academic processes and, unlike other...
This paper presents a novel cascaded multilevel PWM ac-ac converter that can solve commutation problem. By cascading the single-phase PWM ac-ac converter that uses basic switching cell structure and coupled inductors, the proposed converter does not need to sense the voltage or current polarity for safe commutation. When many unit-cells are cascaded, the proposed converter has more output voltage...
Using one DC source for the dual inverter open-end winding topology can lead to common-mode current circulating through the DC bus connections and, to prevent motor failure, arising of EMI issue and increasing losses in the system this should be avoided. Such common-mode current flow results if there is a common-mode voltage (CMV). Therefore, in this paper, a switching scheme for the dual inverter...
This paper presents an integrated design process that combines theoretical analysis and heuristic verification to develop the magnetic components of a commercial 2.5-kW bidirectional charging system for a vanadium flow battery. The design process aims to fulfill a rigid set of electrical, mechanical, and thermal requirements for the battery charger. The design has been verified using simulation and...
Sampling-based approximate query processing method provides the way, in which the users can save their time and resources for 'Big Data' analytical applications, if the estimated results can satisfy the accuracy expectation earlier before a long wait for the final accurate results. Online aggregation (OLA) is such an attractive technology to respond aggregation queries by calculating approximate results...
A high step-up converter based on three-stage SCVA is proposed. The operation principle and performance analysis of it is evaluated in continuous conduction mode. It has a high voltage gain with low voltage stress across components of the SCVA, as well as a simple control circuit, which is regulated by the conventional pulse-width modulation technique at a constant frequency and duty cycle, as well...
Switched Intelligent Grid Networking Systems (SIGNS) [31] is the result of research, analysis and development of an alternative process for controlling end-user electrical power quality, as well as transients on the incoming electricity supply grid. In the past power quality issues associated with the grid network were usually generated by the connected loads. This has changed in today's grid system...
In this paper, a new single-phase single-stage ZCS PFC boost rectifier with reduced switch count is introduced. The efficiency of the proposed converter is improved by eliminating input stage diode-bridge. Moreover, only two active switches are used to permit bi-directional current flow from high-voltage-rail to low-voltage-rail and vice versa. Hence, no auxiliary switch is needed. A resonant inductor...
A highly reliable and efficient battery management system (BMS) is crucial for applications that are powered by electrochemical power. Cell balancing is one of the most important features of a BMS. Cell balancing techniques help to distribute energy evenly among battery cells. Without cell balancing, a portion of the capacity or energy in the battery bank will be wasted, especially for long battery...
A hybrid AC-DC nanogrid (NG) can be considered as the power supply system for future community houses. In this paper, the operation and control of a NG are presented. The NG consists of an AC bus and a DC bus, interconnected through a tie-converter. Each bus may have several loads and micro sources. The NG should have an adequate generation capacity to supply its loads in off-grid mode as well as...
This paper analyses solar and load data for a typical western Sydney region and the impacts and benefits of embedded solar on the local distribution grid, and proposes a simple real and reactive power control routine of solar sources to avoid excess radial distributor voltage rise and feeder current and losses. The benefits of local storage are also discussed. This paper's conclusions are that significant...
This paper represents a multi-part switching test technique for testing Load Break Switches (LBS) using the basic synthetic test circuit (Weil circuit). In order to define the transient recovery voltage (TRV) due to LBS contact opening, a 4-parameter TRV envelope is proposed with an initial time delay parameter. A comparison between IEEE and IEC standard requirements has been made to compare the relative...
Jigsaw puzzle programming environments manipulate programs primarily by drag-and-drop. Generally these environments are based on their own special-purpose languages, meaning students must move on to another language as their programs grow. Tiled Grace is a tile-based editor for Grace, an educational programming language with a conventional textual syntax. Using Tiled Grace, programmers can move seamlessly...
This article introduced a well water monitoring system based on Freescale Kinetis. In order to improve the efficiency of the local water resources, this system is well designed which is based on the objective condition of the water scarcity. this system can achieve functions which include the automatic control of the water-pump switch, remote monitor, power failure protection, the Data Backup and...
This paper presents the general guidelines on developing a laboratory prototype Voltage Source Converter (VSC). One of the main possible reasons behind the limited hardware verification by postgraduate students, carrying out research in the area of power electronics and especially the VSCs, is the lack of knowledge and unavailability of proper tutorials and guidelines for developing hardware prototypes...
Frequency regulation is central to the successful operation of remote wind-diesel powered electrical grids. Use of secondary or “dump” loads are necessary to allow instantaneous wind generation to exceed grid demand. The present study investigates the feasibility of using a network of Electric Thermal Storage (ETS) units without centralized control as an effective secondary load. Individual ETS units...
In this paper, the configuration composed by a Two-Input Buck (TIBuck) converter and a boost inverter is proposed for low-voltage grid-connected PV systems. This configuration is attractive for this application because it has high efficiency and can achieve dual maximum power point tracking (MPPT) with only one active switch. However, in this system, the nonlinear characteristics of the converter...
The unbalanced conditions are taken into account in the Reactive Power/Voltage control of distribution system. The aim of the control is to simultaneously minimize energy loss and improve voltage profile. The control is carried out by optimal dispatch of load tap changers (LTC) and shunt capacitors considering unbalanced conditions. A genetic algorithm (GA) is developed to determine the load curve...
Double-pulse tests are commonly used as a method for assessing the switching performance of power semiconductor switches in a clamped inductive switching application. Data generated from these tests are typically in the form of sampled waveform data captured using an oscilloscope. In cases where it is of interest to explore a multi-dimensional parameter space and corresponding result space it is necessary...
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