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CONTROL OF POWER CONVERTERS IN DC MICROGRIDS WITH RES E.S. Andreenkov
ORCID: 0000-0002-9928-5354 e-mail: root67@mail.ru
Smolensk branch of «National Research University «MPEI»
Smolensk, Russia
Abstract. The paper examines a distributed control system for power converters
in a microgrid with a DC bus and the integrated use of renewable energy power sources.
A comparative analysis of the main methods for implementing distributed control is provided. The concept of power and energy flow control is presented, within which the DC
bus voltage is used as the only means of communication between the controlled components of the microgrid, and which allows for independent control of the operation of several
sources, including renewable ones, in one microgrid, considering their priority. An algorithm that implements the presented five-state control concept is shown. Models and operating modes of power converters of sources and storage devices that implement the presented control concept are considered. To demonstrate the operation of the control algorithm based on the bus voltage level, simulation of a microgrid with a DC bus, three sources
and a load was carried out in the Simulink (Matlab). In this case, a simplified model was
used, which did not consider transient effects when switching converters, inductance, and
capacitance of transmission lines. The results of modeling a microgrid with transitions between several operating states are presented. In each state, power balance and a stable voltage level are ensured, which confirms the performance of the proposed control strategy.
The presented concept makes it possible to implement operating modes of sources depending on their priority, which is especially important for renewable energy sources, while
several sources can operate in each state, and the use of a DC bus as a communication
channel ensures maximum simplicity and reliability of the system.
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