Improving the quality of electricity in local supply systems by managing operating mode bidirectional three-phase voltage converter

Abstract

The possibility of a comprehensive improvement the quality of electricity in local power supply systems, in particular small distribution systems based on the concept of “Microgrid Plus”, is explored due to the use of the capabilities of three phase bidirectional semiconductor transducers operating in the mode of three-phase active correction factors of power factor, by forcing the formation of input currents. It is shown that the use of the proposed methods for forming the reference signal of the input currents of the indicated converters allows, while maintaining the low values of the total harmonic distortion coefficients of the input currents inherent to the active correction factors of the power factor, to realize the possibility of maintaining the level of the voltage of the local system within the established limits by compensating the inductive component of the group’s current loads and at the same time ensure the simulation of the phase loads of the local power supply systems. The implementation of this feature in “Microgrid Plus” systems is facilitated by the presence of a ramified system for controlling the parameters of consumption and generation of electricity and the transmission of the data received between users of the local system, which allows formulating tasks to maintain the quality of voltage within the limits set by normative documents. The realization of such an opportunity becomes especially relevant in these local systems when integrating them into electric power drives based on the use of bi-directional converters of electricity, weighing the rated power of the power storage units comparable to the installed capacity of the local system and the capabilities of the output two-way converters of accumulation systems in the specified modes