МОДЕЛЮВАННЯ ЕНЕРГЕТИЧНИХ ПРОЦЕСІВ В ГІБРИДНІЙ ФОТОЕЛЕКТРИЧНІЙ СИСТЕМІ З АКУМУЛЯТОРОМ ДЛЯ ПОТРЕБ ЛОКАЛЬНОГО ОБ’ЄКТУ

Purpose. Improving the efficiency of a hybrid photoelectric system with a rechargeable battery for the needs of the local object by improving the management of the forecast with simulation of energy processes in the system, development of principles for the implementation of energy management systems.Methodology. Analysis of energy processes in the electrical circuits of the photoelectric system with the formalization of the principles of control reconfiguration and the use of computer modeling based on archival data of photoelectric battery generation to evaluate the efficiency of energy management.Findings. Block structures and the general structure of the model of energy processes in the system for the daily cycle of work with an estimation of the cost of electricity consumed from the grid have been developed. The principles of control modes and power consumption of the system according to the forecast of photoelectric battery generation were formalized.Originality. The principles of setting the battery current according to the forecast of photoelectric energy generation, the state of battery charge and the power limit consumed from the grid have been improved. It will help to make better use of the energy of the photoelectric battery and reduce the consumption of electricity from the grid. The mathematical model of the rechargeable battery, built on the manufacturer's catalog data has been improved. The formalization of energy processes in the system with the use of additional variables, which provide reconfiguration of work with regulation of photoelectric battery generation or battery current and taking into account the power limit consumed from the grid is substantiated.Practical value. The obtained solutions are the basis for designing photoelectric control systems to meet the needs of local objects.

Diagnosis of Gasoline Injection Engine and Fault Tolerant Control

The paper presents some considerations regarding the diagnosis and control of a gasoline injection engine for motor vehicles. The growing importance of diagnosis is highlighted in the conditions in which the practice has shown that there are always some faults, the fault being defined as a deviation of a parameter or a variable from its nominal value. Here are some solutions used in the gasoline injection engine, related to fault tolerant control. It is exemplified by treating the air pressure control system admitted in the engine cylinders of the Audi A6 car, targeting the pressure sensor in the intake manifold. Keywords: motor vehicle, diagnosis, fault tolerant control (FTC), PID controller, fuzzy logic, control reconfiguration

Command Governor strategy based on region of attraction control switching

The command governor (CG) is a useful strategy to avoid constraints violation in case of control reconfiguration or operational conditions changes, like switched systems mode changes. In general, the structure of the CG specializes in producing an alternative reference signal to drive a closed-loop system to the desired reference while avoiding constraints violations in the control signal, state-space, or combinations of them. In this paper, we propose a simple strategy that modifies the conventional structures of the CG and supervisor, yielding a switched rule based on the estimated controllers' region of attraction. We present some simulations to illustrate the proposal's potential and compare it with a competitor scheme exploiting a dwell-time approach. The results suggest that our approach adds new possibilities of CG and supervisor design, reducing the transition time between system modes and improving the closed-loop performance indexes.

Automatic Fault-Tolerant Control of Multiphase Induction Machines: A Game Changer

Until very recently, the fault tolerance in multiphase electric drives could only be achieved after fault localization and a subsequent modification of the control scheme. This scenario was profoundly shaken with the appearance of the natural fault tolerance, as the control reconfiguration was not required anymore. Even though the control strategy was highly simplified, it was still necessary to detect the open-phase fault (OPF) in order to derate the electric drive and safeguard its integrity. This work goes one step beyond and suggests the use of an automatic fault-tolerant control (AFTC) that also avoids the detection of the OPF. The AFTC combines the natural fault-tolerant capability with a self-derating technique, finally obtaining a hardware-free software-free fault tolerance. This achievement changes completely the rules of the game in the design of fault-tolerant drives, easing at the same time their industrial application. Experimental results confirm in a six-phase induction motor (IM) drive that the proposed AFTC provides a simple and safe manner to add further reliability to multiphase electric drives.