Keywords: Modeling, fossil resources, renewable energy, losses.
Introduction
Due to the fact that distribution networks are the most suitable part for connecting to the power system, the most important step in using Distributed Generation (DG) is to place them in distribution networks and their optimal capacity. This is important because it reduces costs associated with casualties, reliability, and the cost of building production units\cite{2017,a2019,Alayi_2019}. and the posts are taken into account. On the other hand, uncertainty is one of the most important factors in increasing risk in the planning of power systems, so failure to consider this parameter leads to significant economic and technical losses.
Today, distributed generation sources are widely used in electrical systems due to their high importance in energy production\cite{f2020,Tribioli_2019}. Sincron generators are one of the most widely used types of dispersed products that are installed in medium pressure distribution systems. Because of the type of synchronous generator, DG performance capabilities, which have different operating modes such as power factor and voltage control, as well as the ability to install in different locations, can also affect the performance of voltage control and reactive power equipment\cite{Cavalcanti_2019,Nguyen_2019,Esmaeili_2019}. Therefore, to ensure ULTC, especially DG, does not adjust the appropriate voltage in the system, the connection of the distribution system units must be done in coordination with other equipment of the system\cite{Valverde_2019,Murty_2018}.
So far, several studies have been proposed on the control of voltage and reactive power in electrical energy distribution systems without examining the effect of DG. \cite{Kim_2020}\cite{Ampofo_2019}\cite{Eltamaly_2019,Kim_2020,Ampofo_2019,Liu_2020,Mahdad_2019}.Given the scope of the problem, most research has sought to achieve the best response in the shortest possible time, with only the feeder capacitors entering the optimal voltage and reactive power control, while the low capacitors not being considered \cite{s2019,Hao_2019,Chen_2019}.
In order to solve the multi-objective problem of voltage control and reactive power, the Phase building of target and constraint functions as well as metal hardening algorithm has been used to determine the final answer \cite{Huang_2020,Saffari_2020}. To reduce the search space, a time-based algorithm was used to predict the 24-hour forecast to determine the position of the pulse at any time interval, as well as the genetic algorithm to determine the optimal response\cite{Alayi_2019a} . The issue of voltage and reactive power control was performed in the presence of a scattering source of induction machine type (wind turbine) and using a combination of local and centralized control of equipment \cite{Alayi_2019a,Shamel_2016}. Feeder capacitors are controlled by a local voltage type controller: an abnormal position in the controller. However, Changer's low and high capacitors can be remotely controlled and thus controlled on a daily basis. Also, in both local and proposed controls, DG and the effect of how the change control function has been proposed have been investigated. Reactive voltage and power control is performed in the presence of scattered generator-based generator sources, and it is assumed that all equipment has only local control capability.
Meanwhile, assuming that the distribution system is equipped with automation, centralized control of control equipment is performed at any time of the day and night, observing the prevailing restrictions and with objectives such as: reducing losses and improving voltage profiles. This control is done in two modes with and without the presence of a scattered production source and in two modes of power factor control and voltage control. Also in the considered problem, DG is the effect of location and capacity. Due to the discrete space of the optimization problem, the genetic algorithm has been used to optimize and determine the position of the equipment 24 hours a day. At present, more than ever, the design and operation of power systems with maximum efficiency and maximum reliability and safety have been important, and this has been the motivation for a series of developments in transmission and distribution technology. One of these cases is reactive power control in transmission and distribution networks and today for various reasons such as increasing the transmission capacity of existing lines, preventing rapid and large changes in the voltage level, improving power factor, balancing the load and so on. It has become increasingly important.