Analysis of the Control Process of a Unified Power Quality Regulator During Rapid Voltage Changes

The article analyzes the control processes of a unified power quality conditioner (UPQC) in the event of rapid voltage changes in electrical grids. The parallel-serial and serial-parallel UPQC schemes are considered, which allow for small reactive power compensation to ensure load voltage stability. Mathematical models are presented for estimating load voltage and reactive power of compensators. Studies have shown that a parallel compensator effectively reduces reactive power consumption from the grid, while a serial compensator increases load voltage. The results obtained demonstrate the change in load voltage depending on voltage fluctuations of the power source, as well as the effect of active regulation of UPQC parameters on network voltage stability. Special attention is paid to adaptive regulation, studied within the framework of a mathematical model, which provides optimal quality of reactive power compensation and load voltage stabilization. The results obtained confirm the effectiveness of the proposed approach to UPQC control, which ensures stable system operation and increases energy efficiency of electrical networks. In addition, it is shown that the implementation of such regulators into distribution networks significantly improves their reliability and ensures compliance with modern requirements for electricity quality. The proposed control methods allow for effective adaptation of the operation of the UPQC to the conditions of the alternating mode of the electrical network. Analysis of the mathematical model confirmed that the use of the considered approaches provides voltage stability and reduced power losses. The results obtained can be the basis for further research in the field of electricity quality management.