The purpose of the publication is to use the methods of the similarity theory to control power consumption in industrial enterprises. On the basis of the fifth additional provision of the theory of similarity, it is proposed to apply the stochastic characteristics of the daily graphs of the electrical load of transformer substations. An approximate method for calculating the coefficient of similarity of both daily schedules of electrical load with each other and the selected daily schedule with the declared schedule on the "Daily market in advance and intraday market" has been developed. This method can be used when choosing the consumption of various energy resources.
The problem of resonance phenomena in power systems of industrial enterprises using capacitor banks for reactive power compensation was detected. Circuit of the capacitor banks tier to downshift main substation tires is present. But there is no common algorithm to calculate and avoid such trouble. The main goal of this article is to introduce some basics for power supply systems with possible resonant circuits engineering. Methodology. At the first step the data on the change of the current in the chemical company network when changing capacitor banks value are received. For these purposes the oscilloscope function of digital protection relay was used. Current data samples were analyzed by spectrum detection software. Most significant levels of the 3rd and 5th harmonics were achieved. Comparison of harmonic distortion levels with and without capacitor bank is given. Results. Achieved data allow making conclusion about overloading reasons of capacitor banks while higher harmonics currents presence. A voltage and current harmonious composition measuring in the absence of power quality analyzers using digital protection relay terminals or emergencies registers are proposed. The necessity of power quality monitoring near capacitor banks connections to avoid resonance phenomena (current and voltage resonance) in industrial power supply systems is proven. The control algorithm of capacitor banks to provide electromagnetic compatibility, while various modes of nonlinear load operation is given. Originality. Using of digital protection relay oscilloscoping for current resonant detection can allow to significally reduce time and cost of solution. Replacement parallel circuit comprising a branch and one active-inductive load to another branch network in the presence of higher harmonics source are proposed. Practical value. A sequence for measuring the levels of harmonic components at the connections of capacitor banks in the absence of specialized instruments is proposed. The algorithm to avoid possible resonance currents in the presence of condensing units is proposed. References 9, tables 2, figures 2.
Research purpose is generalization and further development of economic-mathematical methods for ensuring energy-efficient operation mode of production facilities. The above methods can be used for selection of the most energy-efficient production lines, mechanisms; pumping, compression, ventilation installations or other electric receivers among several similar ones by using equal and unequal weight criteria. An example of comparing the efficiency of the production facilities of the chemical industry is showed by a priori ranking and morphological (geometric) methods. The method of control the correctness of the production facilities in the case when the electric load depends on two parameters in triangular coordinates in the presence of boundary restrictions is described. The identity of the current energy values calculated by Holt predicted value at a predetermined optimal smoothing constant determines the stability of the process. Expedience of application the autocorrelation coefficient for testing processes on the stability is proved. References 10, tables 3, figures 5. Key words: power consumption, criteria of equal and unequal weights, the autocorrelation coefficient, energy efficiency.Целью исследования является обоснование выбора наиболее целесообразных экономико-математических методов обеспечения энергоэффективного режима работы производственных объектов. Рассмотренные методы могут быть использованы для выбора наиболее энергоэффективных технологических линий, агрегатов, насосных, компрессорных, вентиляторных установок или других электроприемников с нескольких им подобных по равновесным и неравновесным критериям. Приведен пример сравнения эффективности работы производственных объектов химической промышленности методами априорного ранжирования и морфологическим (геометрическим). Описан способ контроля энергоэффективности работы производственных объектов в случае, когда электрическая нагрузка зависит от двух параметров при наличии предельных ограничений их, используя треугольные координаты. Сделан вывод о том, что тождество текущего значения энергопотребления с рассчитанным методом Хольта прогнозируемым значением при определенных заранее оптимальных постоянных сглаживания определяет стабильность работы технологического процесса. Доказана целесообразность применения коэффициента автокорреляции первого порядка выборок электропотребления для проверки технологических процессов на стабильность работы. Библ. 10, табл. 3, рис. 5. Ключевые слова: электропотребление, равновесные и неравновесные критерии, энергоэффективность, коэффициент автокорреляции.
Aims of this research are development of a complex statistical analysis algorithm for active electric power consumption data, consumption of energy resources and manufacturing products, implementation of statistical analysis in practice. Proposed parameters and criteria, which can help to technical staff in factories, to provide optimal and economical operating of supply and distribution systems as electricity, water, gas, heat, compressed air, etc. for production facilities, based on the collected active electric power consumption data for previous periods, information about consumption dynamic. It is concluded that the statistical analysis of the data, obtained for each type of engineering equipments (water supply and sewage, supply systems of compressed air, gas, electricity and steam) and various consumables coefficients (in the proposed algorithm) make possible to identify "weak areas" and to determine the most rational ways to optimize energy usage.
У статті детально досліджена проблема відновлення одиночних даних технічного обліку електроенергії методом експоненційного згладжування. Перевірена гіпотеза про ефективність знаходження оптимального значення постій-ної згладжування α в діапазоні 0 < α < 2. Встановлено діапазони зміни значень середньої абсолютної відсоткової поми-лки прогнозу залежно від значень коефіцієнта варіації часового ряду для конкретних процесів електроспоживання з різним розкидом даних. В статье детально исследована проблема восстановления одиночных данных технического учета электроэнергии методом экспоненциального сглаживания. Проверена гипотеза об эффективности находить оптимальное значение постоянной сглаживания α в диапазоне 0 < α < 2. Установлены диапазоны изменения значений средней абсолютной процентной ошибки прогноза в зависимости от значений коэффициента вариации временного ряда для конкретных процессов электропотребления с различным разбросом данных.
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