Abstract
Induction furnaces of industrial frequency are often used at industrial enterprises for melting ferrous and non-ferrous metals and their alloys, for overheating them before casting. The resistance of the electric furnace is inductive. The total power of the induction installation includes an active component and reactive component, where the reactive power is an adjustable electrical parameter. During the melting of metals, the active-inductive load of the induction installation changes and the value of its power factor reaches 0.3. Compensation of reactive power at the input of induction furnaces inductor leads to a significant decrease in the installed power of the electric furnace transformer controlled under the load, energy losses and the cross section of cable lines. Batteries of electric capacitors are usually used as transverse compensation devices. A scheme and fuzzy algorithm for regulating the reactive power of an induction furnace of industrial frequency based on fuzzy logic are developed. The study of the fuzzy controller operation for reactive power compensation of induction furnaces of industrial frequency based on the Mamdani’s method shows that the fuzzy algorithm better maintains a given amount and direction of reactive power at the connection point of the induction furnace inductor to an electric furnace transformer. Fuzzy controller responds faster to changes in reactive power.
Highlights
A New Approach Based on Fuzzy Controller for Volt/Var Control in Distribution System // Australian Journal of Basic and Applied Sciences. 2010
Induction furnaces of industrial frequency are often used at industrial enterprises for melting ferrous and non-ferrous metals and their alloys, for overheating them before casting
Compensation of reactive power at the input of induction furnaces inductor leads to a significant decrease in the installed power of the electric furnace transformer controlled under the load, energy losses and the cross section of cable lines
Summary
Разработана схема и нечеткий алгоритм регулирования реактивной мощности индукционной печи промышленной частоты на основе нечеткой логики. При исследовании работы нечеткого контроллера управления компенсацией реактивной мощности ИП промышленной частоты на основе алгоритма Мамдани было получено, что нечеткий алгоритм лучше поддерживает заданную величину и направление реактивной мощности на месте подключения индуктора ИП к электропечному трансформатору. Рассматривается задача построения структурной схемы нечеткого контроллера управления компенсацией реактивной мощности ИП, устанавливающего границу мощности конденсаторов КУ или дискретное число единичных элементов батареи конденсаторов для отдельных периодов процесса плавки. 1 приведена структурная схема нечеткого контроллера управления компенсацией реактивной мощности ИП промышленной частоты, осуществляемого изменением числа секций КУ в каждом периоде процесса плавки. ИП; 2) задание для каждой из входных и выходных переменных функции принадлежности; 3) разработка лингвистических правил; 4) выбор и реализация алгоритма нечеткого логического вывода; 5) анализ процесса управления компенсацией реактивной мощности. Общий логический вывод выполняется по схеме, представленной на рис. 2
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