Оценка искажений напряжения в системах электроснабжения промышленных предприятий
Аннотация
Отклонения показателей качества электроэнергии (ПКЭ) от нормативных значений в системах электроснабжения промышленных предприятий приводят к браку продукции, полному останову технологических процессов и значительным ущербам. При этом требования промышленных потребителей к ПКЭ различны, что обусловлено особенностями ответственных электроприемников. Для обеспечения их надежной работы требуется внедрять устройства автоматического контроля ПКЭ, оценивающие степень искажения синусоидальной формы напряжения трехфазной системы. Это позволяет дежурному персоналу электросетевых компаний и промышленных предприятий оперативно принимать решения по реализации мероприятий в сетях внешнего и внутреннего электроснабжения для введения ПКЭ в область допустимых значений. Для оценки степени искажений синусоидальной формы напряжения в статье предложен обобщенный показатель, основанный на использовании модуля отношения комплексных амплитуд прямого и обратного вращения пространственного вектора. Представлены блок-схемы алгоритмов и структурные схемы устройств автоматического контроля ПКЭ, в которых реализован параметрический и непараметрический многогипотезный последовательный анализ с применением обобщенного показателя. Использованы алгоритм Палмера и метод «ближайшего соседа». Результатами расчетов обосновано, что разработанные алгоритмы обладают высоким быстродействием и эффективностью выявления отклонений ПКЭ.
Литература
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