2results about How to "Less power conversion stages" patented technology

This invention discloses a quasi-single-stage three-phase pulse power supply and its control method. The quasi-single-stage three-phase pulse power supply includes a three-phase T-type three-level rectifier and a synchronous rectifier converter. By injecting a zero-sequence component into the three-phase modulation wave, the power transferred from the T-type three-level rectifier to the low-voltage port is adjusted. Part of the energy is directly transferred to the load by the T-type three-level rectifier, achieving maximum power single-stage transmission and improving energy transmission efficiency. Furthermore, the wide-range fluctuation of the capacitors at the high-voltage and low-voltage output terminals of the T-type three-level rectifier compensates for the instantaneous power difference between input and output, suppressing the impact of pulse power on the AC power grid. Simultaneously, the synchronous rectifier converter compensates for voltage fluctuations at the low-voltage output terminal capacitor, providing a stable voltage to the pulse load. This invention achieves input-output power decoupling, suppresses the impact of pulse loads on the AC power grid, and improves energy transmission efficiency by maximizing power single-stage transmission, making it suitable for applications with pulse loads.

The invention relates to the technical field of distributed power supply grid-connected control, in particular to a multi-microgrid flexible interconnection control method, system and device based on a common direct current bus and a storage medium. A plurality of optical storage and charging micro-grids are connected to a common direct current bus through a modular multilevel converter, and a micro-grid group flexible interconnection architecture is constructed; a three-layer control architecture is established, the bottom layer executes current inner loop and power outer loop control to realize rapid current tracking and power adjustment, the middle layer realizes distributed automatic power balance among micro-grids based on droop control of DC bus voltage deviation, and the upper layer performs coordinated optimization control according to power generation cost, energy storage charge state and load demand. And solving the optimal power distribution scheme under the condition of meeting the power balance constraint and the equipment constraint. The power conversion level is reduced, the energy transmission loss is reduced, the power balance response time is shortened, the communication coordination complexity is reduced, and the problems of low power conversion efficiency and insufficient direct current side resource utilization in multi-light storage and charging micro-grid interconnection are solved.