The article deals with equivalenting of complex electrical networks of industrial enterprises. In the article the different methods of averaging equivalenting elements in power systems are compared, specifically, the method of moments, the equivalent section method, and the average value method. The current value of the capacitor bank as part of the electrotechnical complex of the enterprise is the main criterion for determining the equivalenting error of the electric network. The equivalenting in the presence of high harmonics in electrical networks of the enterprise is considered by applying the methods under discussion. Comparison of these equivalenting methods in the presence of high harmonics shows that the error in the calculation of capacitor bank current ranges from 3,8 to 14,7 %. In addition, the most accurate method for determining the capacitor bank overload is the method of moments.
In this article considered the rational formation of the complex electrical load schedule. Application of this method allows to achieve savings in the payment of electricity and increase the possibility of energy transfer. The effect is achieved by uniform distribution of energy consumption during the day.
In article the new approach to modelling of processes arising in the presence of the frequency electric drives is offered, offering to consider corners of shift of phases on various harmonics. Research of power characteristics of a frequency drive was spent on the basis of the spent experiment.
The optimization of reactive power compensation in the presence of harmonics in the electrical network complex is a complicated computational problem. The authors propose a calculation method that significantly reduce the computation procedure and still get the desired result as the choice of device parameters for reactive power compensation and harmonics filters.
This work contains brief analysis of high harmonics reduction methods. It is offered to make a choice between reduction methods of high harmonics influence on condenser batteries depending on factors of harmonics occurrence. Definition algorithm for the most effective method of high harmonics reduction on condenser batteries operation is created.
In the recent years, the researchers and experts in the field of energetics often mention in their publications a need to reduce power transmission losses. Among different ways to accomplish this goal the method of the company load leveling stands out due to its simplicity, accessibility and efficiency. The paper proposes a new assessment factor for additional power losses in distribution network. It is known that dispersion of the load curve correlates with the amount of power losses, which is why the proposed factor is put in a position of dependency on the shape of the load curve of the company. It is demonstrated that the proposed factor can help to identify without any strain a need in technical measures for levelling the load curve of the company and to assess efficiency thereof.
The article discusses the issues of identifying the location of non-linear loads in electrical networks which makes the main contribution to the distortion of the non-sinusoidal voltage and current in the distribution network of an industrial enterprise, including mining enterprises. The existing methods for determining the location of the source of higher harmonic components in voltage and current are considered, their advantages and disadvantages are revealed. The main disadvantages of the methods used include the low accuracy and incorrectness of their use in existing enterprises. When developing a new method, the authors were faced with the task of simplicity of its use in the conditions of industrial operation of electrical equipment and the absolute correctness of the results obtained. The proposed method of identifying the source of higher harmonics is based on the variation of the parameters of the power system, in particular, the change in resistance of power transformers taking into account their transformation ratio. It is shown that by varying the transformation ratio during regulation under load, the total coefficient of the harmonic components of the voltage changes. Based on the constructed dependencies, the variation of the derivative of this function with different variations of the parameters of sources of higher harmonics is analyzed and a method is developed that allows determining the share contribution of consumers to the total harmonic component of the voltage.