Synchronization of pulse-width modulation of the active rectifiers connected in parallel

• Published in: 2019 International Conference on Electrotechnical Complexes and Systems (ICOECS) pp. 1 - 6
• Main Authors: Grekov, Eduard L., Sorokin, Victor A., Shelikhov, Evgeny S.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.10.2019
• Subjects: phase locked loop; regulator; The pulse-width modulation
• DOI: 10.1109/ICOECS46375.2019.8949908

In this article the way of synchronization of the pulse-width modulation of the active rectifiers connected in parallel is considered. At the modular principle of increasing the installation capacity, each of them is controlled by a separate control unit. At the same time the mismatch of frequency of the pulse-width modulation of microcontrollers, clocked by different quartz resonators is possible that in turn leads to significant increase in level of subharmonics and, as a result, to an alternation of amplitude of currents and swinging of voltage on the capacitor in a link of constant voltage. The research of influence of a mismatch of frequencies on quality of the network currents formed by the active rectifiers is conducted. For elimination of this shortcoming it is offered to execute synchronization of work of PWM of modules using sine wave of network as a basic signal, and for regulation of frequency to use a phase locked loop. The phase locked loop algorithm with the switching structure used various regulators for larger and small deviations of frequency is offered. The operability of an algorithm is approved on the Matlab Simulink model imitating work of subprogrammes of the microcontroller with quantization on level and time.