Midpoint balance control method of flywheel energy storage motor driving circuit in discharging process
A motor drive circuit and flywheel energy storage technology, applied in the field of flywheel energy storage, can solve problems such as poor stability of high-speed flywheel energy storage motors
Active Publication Date: 2021-09-10
DUNSHI MAGNETIC ENERGY TECH
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[0004] In view of this, an embodiment of the present invention provides a midpoint balance control method for a drive circuit of a flywheel energy storage motor to solve the problem of poor stability of a high-speed flywheel energy storage motor in the prior art
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[0033] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
[0034] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.
[0035] In one embodiment, such as figure 1 as shown, figure 1 A schematic diagram of the drive circuit of the flywheel energy storage motor provided in this embodiment is shown, which includes:
[0036] Bus capacitor C1, bus capacitor C2, phase A upper bridge arm out...
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The invention is applicable to the technical field of flywheel energy storage, and provides a midpoint balance control method of a flywheel energy storage motor driving circuit in a discharging process, which comprises the following steps of determining a conduction phase XY of the driving circuit at the current moment based on a rotor position of a flywheel energy storage motor, in the stage of converting mechanical energy into winding magnetic energy, controlling the switching tube in the X-phase lower bridge arm and the switching tube in the Y-phase upper bridge arm to be switched on, in the winding magnetic energy-to-electric energy conversion stage, obtaining the midpoint voltage deviation of the driving circuit at the current moment, and determining the turn-off sequence of the switching tube in the X-phase lower bridge arm and the switching tube in the Y-phase upper bridge arm according to the magnitude of the midpoint voltage deviation. According to the scheme, only two power switching devices can generate switching actions in any conduction interval, so that the loss of the switching devices is reduced, meanwhile, the turn-off time sequence of the power switching devices is controlled by monitoring the voltage balance condition of the direct-current bus terminal, and the balance control of the midpoint voltage of the driving circuit is realized.
Description
technical field [0001] The invention belongs to the technical field of flywheel energy storage, and in particular relates to a midpoint balance control method for a drive circuit of a flywheel energy storage motor during a discharge process. Background technique [0002] At present, high-speed flywheel energy storage systems are widely used in urban rail transit systems to realize regenerative braking energy recovery and smooth traction network pressure fluctuations. The high-speed permanent magnet brushless DC motor is usually used as the energy storage drive motor of the high-speed flywheel energy storage system because of its high efficiency, high power factor, and simple control method. [0003] At present, in order to meet the high power density and high energy density requirements of the urban rail transit system, the flywheel energy storage system adopts a multi-pole composite carbon fiber high-speed motor rotor scheme to increase the speed and torque of the motor. H...
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IPC IPC(8): H02M7/219H02P9/30H02J3/30
CPCH02M7/219H02P9/305H02J3/30Y02E60/16
Inventor 赵思锋陈鹰唐英伟
Owner DUNSHI MAGNETIC ENERGY TECH