Kurdi B. Estimation and normalization of power quality in electrical networks of the large industrial center

The object of research - city electrical networks with the big densities of industrial loadings. The purpose of research is the development of methods of account and normalization of power quality indices in distributed electrical networks with the big densities of industrial loadings. Investigations were carried out by using of methods of the theory of stochastic processes and theories of electrical circuits. Measurements were carried out by means of such instruments: recorder H-115, spectrum analyzer CK4-56, oscilloscopes. Accounts and researches were carried out with the help of a computer. The method of an experimental research of merit numbers of the electric power in urban networks with the big densities of industrial loadings is developed, thus parameters of correlation functions and laws of their allocation which can be used as standard for such networks are defined. The program of account voltage distortion for large industrial center is developed. The model differs the registration of amplitude-frequency responses of active, entry and mutual resistances of units of the electrical network which allow to receive acceptable accuracy of account. Expressions for definition of parameters of simple and complicated filters with which help it is proved, expediency of application of tuned filters are obtained from the point of view of their installed capacity. The method of the centralized compensation of the higher harmonics is offered, permitting in complicated networks at presence of several sources of higher harmonics to optimize capacity of filters in view of their overload ability. Outcomes of researches may be used in electric power industry at system design of general purpose electro supply Outcomes of operation are received the General Electrical company of Syria for approbation.