AC motor drive system

A technology of AC motor and drive system, which is applied in the direction of AC motor control, DC motor deceleration device, motor generator control, etc. It can solve the problems of DC bus voltage drop and DC bus voltage rise, and achieve reliable power regeneration Effect
CN106464187BInactive Publication Date: 2019-01-22MITSUBISHI ELECTRIC CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
MITSUBISHI ELECTRIC CORP
Publication Date
2019-01-22
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

In order to obtain an AC motor drive motor system in which the converter (11) reliably regenerates electric power to the system power supply (10), there is a method based on the DC voltage value on the output side of the converter (11) and the charging and discharging of the power storage device (17). The charging and discharging control unit (2) controls the charging and discharging circuit (15) according to the current value. The electric storage device (17) is charged with DC power from the DC bus (12) and discharged to the DC bus (12). The control unit (2) charges the power storage device (17) so that the DC voltage value becomes the The voltage threshold corresponding to the power threshold, in the case that the regenerative power is less than or equal to the power threshold, if the DC voltage value reaches greater than or equal to the regeneration start voltage threshold, the converter (11) performs a regeneration action, and if the regenerative power is less than or equal to the regeneration end voltage threshold, the converter (11) ends the regenerative operation, and the time average value of the DC voltage value during the regenerative operation is lower than the no-load condition when the converter (11) does not perform power supply and regeneration.
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Description

technical field

[0001] The invention relates to an AC motor driving system. Background technique

[0002] At present, as an example of the configuration of an AC motor drive system, an AC motor drive system in which an inverter and a charging / discharging circuit are connected via a smoothing capacitor to convert AC power from a system power supply is given. The output side of the DC power converter, that is, the DC bus, is connected in parallel. The inverter converts the DC power into AC power with a voltage value and frequency different from that of the system power supply in order to drive the AC motor. The charging and discharging circuit is used for storage. , Release DC power storage equipment for charging and discharging.

[0003] For example, Patent Document 1 discloses a technique of charging a part of the regenerative power to the power storage device based on the voltage value of the DC bus line raised by the regenerative power from the AC motor to regenerate the ...

Claims

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