System and method for absorbing regenerative electric energy by isolation conversion of DC bus of frequency converter
A technology of DC bus and DC power, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of limiting the scope of application of power absorption of inverters, inability to connect to inverters, etc., and achieve the effect of broadening the scope of application
Active Publication Date: 2016-05-04
CANADA VFD
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Problems solved by technology
The existing defects of these frequency converter power absorption mechanisms include: they can only work on the same power grid, that is, the power supply of two frequency converters can only be provided by the same power supply network, and cannot be applied to two or more frequency converters Inverters are powered by two different power supply networks; each inverter must have the same voltage level and performance, that is to say, it cannot be applied to the situation where there is voltage level and / or electrical performance between two or more inverters. In the case of the difference in electrical potential, it cannot be applied to the connection of inverters at different potentials, which greatly limits the scope of application of the power absorption of two or more inverters
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[0019] The present invention will be further elaborated below in conjunction with the accompanying drawings.
[0020] The present invention proposes a method for absorbing regenerative electric energy by isolating and transforming the DC bus of the frequency converter, including setting at least two frequency converters each controlling a motor respectively, and each frequency converter includes a rectification unit and an inverter connected through an internal DC bus unit, also includes:
[0021] Set at least two isolation conversion devices respectively connected to the internal DC bus of the corresponding frequency converter. The output terminals of each isolation conversion device are connected in parallel to the same parallel DC bus. Each isolation conversion device includes: DC / AC converter, its Connected to the internal DC bus of the corresponding frequency converter to convert the DC power generated by the corresponding motor into high-frequency AC power; an isolation ...
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Provided is a system and method using direct current buses of frequency converters to isolate, convert and absorb regenerated electric energy. The system comprises at least two frequency converters for respectively controlling one motor, at least two isolating and converting devices respectively connected with the internal direct current buses of the corresponding frequency converters and an inversion device connected with the output ends of the at least two isolating and converting devices. The output ends of the isolating and converting devices are connected to the same external parallel-connected direct current bus in parallel. Each isolating and converting device specifically comprises a DC / AC converter, an isolation transformer and an AC / DC converter. The input end of the inversion device is connected with the external parallel-connected direct current bus and used for converting the direct current electric energy of the external parallel-connected direct current bus to power frequency AC power, thereby being capable of sending the regenerated electric energy provided by the motors back to an AC power supply network and / or directly driving corresponding electric equipment. The system and method can greatly broaden the application scope of two and more than two frequency converter electric power absorption systems.
Description
technical field [0001] The invention relates to a system for absorbing and utilizing the regenerative electric energy of a motor system controlled by a frequency converter, in particular to a system for absorbing and utilizing the regenerative electric energy of a motor system controlled by two or more frequency converters. Background technique [0002] Chinese patent application CN101673953A discloses a new type of energy feedback device that can be connected to multiple inverters, which includes a DC parallel diode and filter capacitor circuit, a three-phase inverter circuit, a three-phase filter circuit, and an intelligent main control unit; the DC parallel A diode and a filter capacitor circuit are connected to multiple frequency converters, limiting the electric energy of each frequency converter to be input into the energy feedback device in the form of direct current, and playing the role of stabilizing and filtering the direct current input; the three-phase inverter c...
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IPC IPC(8): H02J3/38
Inventor 袁德芳
Owner CANADA VFD