Control strategies of the electrical complex of high-voltage electricity transmission lines of the direct current

Currently, the demand for energy is growing at a high rate, and there are problems facing the integration of the electrical network, primarily with the transmission of energy over long distances. The problem described above can be solved using HVDC transmission systems. The main advantages of these transmission systems are associated with lower transmission losses as well as lower costs compared to traditional HVAC transmission systems. For a number of reasons, voltage conversion technology (Voltage Source Converter - VSC) using Pulse Width Modulation (PWM) high voltage direct current (VSC-HVDC) transmission system has a number of potential advantages over a DC transmission system using line commutated converters. (LCC-HVDC), in particular, the implementation of multi-terminal HVDC DC transmission systems is simplified, it becomes possible to quickly and independently control active and reactive power, the possibility of bidirectional power transmission while maintaining the same DC voltage polarity. Due to the high degree of controllability of voltage source converters (VSC), it is mainly dealt with in the recent literature on HVDC operation. Much research and development has been done in the past in the field of VSC-HVDC transmission, especially in its control aspects. However, in most cases, only qualitative methods have been used to describe the operational characteristics of the various proposed management strategies. Therefore, the purpose of the research work in this article is to fill in some of the gaps, such as investigating different control strategies for VSC-HVDC terminals for use in DC networks