Alexander Suzdalenko

Investigation of power supply methods for intelligent LED luminary

In the context of Intelligent Lighting System various lighting devices and technologies are compared. For the most technically beneficiary and rapidly developing LED luminaries control and power supply methods are analyzed and experimentally tested. The optimal one is chosen. Outlines of the further research are defined.

Current Sensorless Control of Front-end Bidirectional AC/DC Converter Based on Half-bridge Topology

Abstract Electrical grid modernization concept promotes the use of DC subgrids in order to improve efficiency, minimizing energy conversion count in the source-to-load chain. The present paper discusses an average current sensorless control algorithm for proposed bidirectional AC/DC converter, which is based on a dual half-bridge topology with common neutral wire that is not commutating during converter operation. The proposed current sensorless control algorithm has been obtained analytically for rectification, grid-tied and stand-alone inverter modes. The average value of inductor current tracks the reference current signal with constant switching frequency. Two control functions for inductor’s discontinuous and continuous current modes have been defined for each of the operation modes, and a sensorless transition between DCM and CCM modes has been stated. The proposed sensorless control algorithm has been also adapted for use with LCL input filter. The results of simulation in the PSIM software approved the analytical model, keeping the average inductor current to follow the reference value in inductor discontinuous and continuous conduction modes. Experimental investigation of the proposed current control algorithm provided similar results confirming the discussed theory.

Development of Single-Switch Model for Current Sensorless Control of Bidirectional Half-bridge AC/DC Converter

The cost and size of switched mode power supplies can be reduced by eliminating the measurement of inductors instantaneous current value. This paper discusses the implementation of current sensorless control algorithm for bidirectional half-bridge AC/DC converter that allows shaping inductors current without current sensor. The operation of half-bridge converter has been simplified to an equivalent single-switch model that simplifies implementation of a digital control system. The simulation results have confirmed the analytical assumptions and correctness of mathematical model.

Comparative study of LED ballasts for different light regulation techniques

Electronic ballast constitutes a significant part of a luminary equipped with light emitting diodes. Its topology affects strongly the energy efficiency, controllability, as well as weight, size and cost of the luminary. Therefore, this part of the luminary has to be designed especially carefully. Previous research has covered these parameters of dimmable ballasts of several topologies and different modulation techniques intended for the fluent mode light regulation. The findings show that buck topology is preferable for many reasons. This part of research extends the estimation procedure proposed earlier to the step mode and pulse mode light regulators. The controllability and power losses of regulators were taken as criteria for our comparison. First, the controllability and losses were analytically estimated and then the obtained result was experimentally verified. In the concluding part, the preferable light regulation technique is presented.

Development of distributed energy management system for intelligent household electricity distribution grid

Electrical energy consumed in residential sector shares about fourth part of global electricity market, which overlapping with industry and commercial load graphics results in highly uneven demand curve. For this purpose, the demand-side management strategies are utilized to face this problem. This article is dedicated to the development of energy management system for contemporary households utilizing renewable energy sources, energy storages as well as controllable loads, which result in superior operation, capable of controlling local electrical appliances during islanded mode, as well as capable to change the consumption pattern by request from utility grid operator.

Case study on using non-intrusive load monitoring system with renewable energy sources in intelligent grid applications

This paper identifies the problem of the non-intrusive load monitoring method of load disaggregation into separate appliances, when some local generators based on renewable energy sources are connected to the same grid, as they may be mismatched with loads variable in time. Three approaches of electrical energy consumption disaggregation from the energy generated from local renewable energy sources are described.

Comparative study of smart lighting grids with LEDs operated with concentrated, localized or distributed control

Smart lighting grids, consisted of smart luminaries with capability to communicate with each other, have great potential to reduce power consumption in the sphere of artificial illumination. This paper provides comparative study of concentrated, localized or distributed control approaches of smart lighting grids and summarizes mentioned approaches by comparing safety, functionality and expandability factors. Afterwards the illumination diagrams are drawn with mathematically and experimentally acquired data for each of the proposed control methods, energy consumption by each of approaches is calculated and discussed.

Guidelines for autonomous data logger design

The guidelines of autonomous data logger equipped with SD flash card are described. Various micro power sources are proposed for implementation of autonomous work, as well as the problem of uninterruptable power supply is discussed and power supply prototype is built powering from custom design Solar panel and Li-ion battery. In the context of data loggers power consumption minimization, the use of various microcontrollers internal peripheral devices is described and software code is analyzed.

Comparison of two power electronic schemes for 3 kW Li-Ion battery charger

Battery management systems are getting of high importance, mainly due to growing interest in electrical vehicles. It can be concluded that the amount of electrical energy that is going to be transformed to different forms by means of power electronics is growing. In context of energy efficiency and stability two battery charger power circuits are presented, calculated and simulated. The results are discussed and plans for the future work are defined.

Choice of power factor corrector for effective operation of MicroGrid and its elements

The given paper deals with power factor correction circuits in the context of improvement of power supply grids. The concepts and key elements of SmartGrids and MicroGrids are discussed in the beginning. Then their possible configurations are compared (planned) and DC MicroGrids are emphasized. Power factor correctors for such MicroGrids are experimentally compared and the most promising solution is chosen.