5results about How to "Suppressed circulation" patented technology

The application belongs to the technical field of battery management, and discloses a parallel battery cooperative control method and system based on a communication bus. The method adopts a decentralized architecture, each battery module periodically broadcasts its own information containing MOS state semantics through the communication bus, and receives other information; each module autonomously decides the switch of the charging and discharging MOS based on a preset rule. The core innovation includes: the MOS closed state is semantically classified into protection closed, logic closed and other types, precise cooperation is realized; a channel giving mechanism is introduced, so that the recovery process after protection is removed has no circulating current; in the discharging state, the braking signal and voltage judgment are combined to intelligently control the feedback current absorption; each module assigns an ID by broadcasting a unique code, supporting hot plug. The application completely eliminates the single-point fault of the traditional scheme, significantly improves the reliability, expandability, safety and energy efficiency of the parallel system, and is suitable for electric vehicles, energy storage devices and other fields.

The application discloses a fair and sequential model predictive control multi-objective optimization method for a parallel T-type three-level rectifier, and aims at solving the problems of power distribution, midpoint voltage balance, circulating current suppression, DC voltage stability and grid current tracking in a parallel T-type three-level rectifier system in a high-power rectifier occasion. The application adopts double closed-loop control, the outer ring adopts adaptive droop control with voltage feedforward, realizes the stability of DC voltage and load power distribution, the inner ring adopts fair and sequential model predictive control, through the fair priority order, not only the advantage that the sequential model predictive control does not need to select a weight factor is reserved, but also the problem that the optimal solution cannot be selected due to the fixed priority order of the sequential model predictive control is solved, the balance of the midpoint voltage, the circulating current suppression and the tracking of the grid current are realized, and the overall scheme realizes the multi-objective optimization control of the parallel system.

This invention discloses a method, system, controller, and medium for suppressing unbalanced MMC circulating current, relating to the field of MMC control. The method includes: acquiring three-phase voltage parameters, three-phase current parameters, and grid angular frequency of the MMC; performing phase sequence decomposition on the three-phase voltage parameters, three-phase current parameters, and grid angular frequency to obtain the positive-sequence and negative-sequence components of the three-phase voltage and three-phase current; using a PI controller to perform inner-loop regulation on the positive-sequence and negative-sequence components of the three-phase voltage and three-phase current, outputting the positive-sequence and negative-sequence reference components of the three-phase voltage in a synchronous rotating coordinate system; performing inverse transformation of the positive-sequence and negative-sequence reference components of the three-phase voltage according to the grid angular frequency, and adding the results of the inverse transformation to obtain the three-phase voltage reference components; performing carrier phase-shift modulation on the three-phase voltage reference components to generate the port levels required for each phase arm, and controlling the operating state of the IGBTs in each phase arm submodule of the MMC based on the port levels.

The invention discloses an energy router coordination control system, method and device and a medium, and relates to the technical field of direct current distribution networks, and the energy router coordination control system comprises an I-path AC 10 kV and an II-path AC 10 kV; the I-path AC10kV is connected to the power adapter 1, one end of the output end of the power adapter 1 is connected to the DC750V bus, and the other end of the output end of the power adapter 1 is connected to the dual-power quick change-over switch 2; the path II AC10kV is connected to a box transformer substation 3, one end of the output end of the box transformer substation 3 is connected to an AC-DC converter 4, the other end of the output end of the box transformer substation 3 is connected to a dual-power quick change-over switch 2, and a 500kW converter 4 is connected to a DC750V bus; and the dual-power quick change-over switch 2 is connected to an AC 380V bus. By introducing a dynamic virtual impedance adjusting mechanism, the circulating current problem in parallel operation is effectively suppressed, and the stability of bus voltage and power distribution is improved.

This invention belongs to the field of AC / DC hybrid distribution network operation and control technology. A method for autonomous and mutual-assistance operation of AC / DC hybrid distribution networks based on flexible multi-state switches includes the following steps: Step S1: Calculate the comprehensive stability index of each node; Step S2: Monitor the comprehensive stability index in real time; Step S3: In the autonomous mode, the SOP within each zone adopts an AC / DC power decoupling control strategy based on dynamic virtual impedance; Step S4: When the power deficit of a zone exceeds a preset proportion of the zone's rated load and the duration exceeds a preset time threshold, the mutual-assistance mode is activated; Step S5: When a system fault occurs, a fault recovery strategy based on model predictive control is adopted; Step S6: Monitor the communication status between the global coordination unit and the control units of each zone in real time. This achieves safe, stable, efficient, and economical system operation, reduces communication dependence, and improves power supply reliability.