Evaluation of the Effect of Static Load Characteristics on the Level of Frequency during Separate Operations with the Grid

Abstract

ue to the requirements for the quality of electrical energy becoming stricter, it is now relevant to assess the impact of various factors on the main quality indicators: voltage and frequency deviations of the network. One of these factors is the static characteristics of various loads, which under certain conditions can have a significant impact on the parameters of the power system. In this article, it is proposed to evaluate the influence of static characteristics on the network’s frequency level when it enters separate operation with the power system and with various changes in the steady-state mode, and also to investigate the relationship between the coef­ficients of the load regulating effect and the value of the short-circuit power or the length of the supply cable. Separate operation was considered because in this mode, the influence of the regulating effect of a powerful load on the mode parameters becomes more pronounced. The scientific novelty of this study consists in an algorithm that allows refining the frequency deviation of an isolated electric power system, taking into account and without taking into account the static load characteristics when changing the length of the supply cable in the KATRAN software package. The main result of this study is the almost direct relationship revealed between the influence of static load characteristics on the network frequency and the distance of the load with a large proportion of synchronous motors from the power source in an autonomous electric power system. We also evaluated the feasibility of taking the regulatory effect of the load into account when calculating electrical modes depending on the type of load and the calculated value of the short-circuit power.