THE SIMULATION MODEL DESIGN FOR THE SECTION OF 10 kV NETWORK WITH CONTROLLABLE ENERGY STORAGE DEVICE

Abstract

Currently, there is a tendency to apply new approaches to optimize the capacity balance and reduce electric energy losses in 10 kV distribution networks, which is reflected in the updated federal standards and standards of PJSC “ROSSETI”. In this regard, the issues of the use of controlled energy storage devices become relevant. The study purpose is to assess the impact of a controlled electricity storage device on the operating mode of the distribution network. Materials and methods. Simulation modeling methods are used in the paper: simulation models of a section of a distribution network and a controlled electric power storage device are developed in the Matlab/Simulink dynamic modeling environment using typical mathematical blocks of Simulink base libraries. The distribution network section is represented by six transformer substations of 10/0.4 kV, which are connected to a power source according to the highway power supply scheme. A controlled electric power storage device is implemented in the model by an electric power storage subsystem and combines a battery subsystem, which consists of eight cells of series-connected Li-Ion batteries with DC-DC converters, and a controller subsystem with PI current and voltage regulators. The energy exchange between the network and the energy storage system is realized in the model by means of an AC-DC converter with an intermediate DC link C0. The controlled electric energy storage device in such system is used as an additional source of electrical energy. A mathematical description of the relationship between the physical parameters of the power supply network and the controlled electric energy storage device is performed. The work results. On the basis of the developed simulation model, the study of the possibility of increasing the efficiency of the electrical energy system through the use of a controlled electric energy storage device was carried out. Transient processes were observed in a controlled electric power storage by measuring the parameters of the battery such as state of charge SOC, %; voltage VB, V and current IB, A. Voltage and power measurements were carried out in nodes on the sides of the lower (0.4 kV) and higher (10 kV) voltage. Conclusions. The analysis results of simulation of the distribution network with a connected controlled electric energy storage device at the end of the trunk line showed a possible increase in the efficiency of the system.