Abstract
Nowadays three-phase power factor correctors (PFC) became widely used. This is dictated by strict requirements of the international electrical technical commission standards to harmonic composition of current supplied by three-phase industrial network. New schematic technical version of three-phase PFC having direct power control and improved efficiency factor is presented. Mathematical description of power component and control system taking in account its functioning depending upon asymmetrical three-phase input voltage was fulfilled. The electrical processes in the presented PFC was analysed by means of computer simulation. The obtained results are of interest to the persons engaged in the development of electrical energy systems and complexes to which higher requirements in respect to power loss reduction and reliable functioning in case of three-phase asymmetrical industrial network are imposed.
Highlights
Nowadays the need for three-phase power factor correctors (PFC) is dictated by the requirements of international electrical technical commission standards (IEC 60028) concerning harmonic composition of current consumed in the view of the fact that electrical energy systems and complexes are connected to power distribution three-phase supply network
Synthesis of the new scheme decision [1, 2] was carried out by means of analysis of the existing three-phase PFC [3,4,5,6,7] and finding out classification signs. This scheme is presented in figure 1, where Ea, Eb, Ec are the EMF of input voltage, RL1...RL6 are the active resistances of input power chokes L1...L6, R is the PFC load
Joining the neutral lead to the middle point of output capacitors gives addition term «ia + ib + ic» in equation for node «N». Taking into account this factor, we developed a three-phase mathematical model for the presented threephase PFC in dq0 coordinate system
Summary
Nowadays the need for three-phase power factor correctors (PFC) is dictated by the requirements of international electrical technical commission standards (IEC 60028) concerning harmonic composition of current consumed in the view of the fact that electrical energy systems and complexes are connected to power distribution three-phase supply network. Besides decreasing the share of higher harmonics in current consumed, it should be noted that PFC application enables decreasing of active current as compared with none-controllable converters of alternating current into direct current. Modern state of the component’s base, namely: power semiconductor elements, passive elements, microprocessor technique, as well as control laws improvement, creates prerequisites for development of the existing PFC schemes to that having higher energetic and dynamic features
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