Harmonic control device and method of frequency converter and frequency converter
A harmonic control and frequency converter technology, applied in the field of frequency converters, can solve the problems of single frequency converter filter parameters and poor harmonic filtering effect of frequency converters, and achieve the effect of improving the filtering effect
Active Publication Date: 2021-11-16
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0004]
The object of the present invention is to provide a harmonic control device and method for a frequency converter and a frequency converter to solve the problem that the nonlinear electronic components inside the frequency converter generate a large number of harmonics during operation, but the filter parameters of the frequency converter are single , there is a problem that the frequency converter has a poor filtering effect on harmonics. By adjusting the filter parameters of the frequency converter according to the harmonic conditions generated by the frequency converter, the effect of the frequency converter on harmonic filtering can be improved.
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[0026] In order to make the objects, technical solutions, and advantages of the present invention, the technical solutions of the present invention will be described in conjunction with the specific embodiments and appended claims. Obviously, the described embodiments are merely embodiments of the invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art are in the range of the present invention without making creative labor premise.
[0027] Since the nonlinear diode drive power electronics, and not with its nonlinear current voltage that varies in synchronism - current characteristic, so that it draws power from the grid runtime manner are not continuous sine wave, but intermittent way to obtain a pulsating current to the grid, this grid impedance along the ripple current and the ripple voltage drops together form, superimposed on the voltage of the grid, the voltage distortion, ...
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The invention discloses a harmonic control device and method for a frequency converter and the frequency converter, and the device comprises a sampling unit which samples the current power transmission parameters at the set position of an N-phase power transmission line of the frequency converter; a control unit which is used for determining whether the current harmonic parameter at the set position of each phase of power transmission line exceeds the set harmonic parameter at the set position of the phase of power transmission line or not according to the current power transmission parameter; wherein if the current harmonic parameter at the set position of each phase of power transmission line exceeds the set harmonic parameter at the set position of the phase of power transmission line, a control signal is sent out; and each filter unit, wherein when each filter unit receives the control signal, the M filter branches in the filter unit are switched on. According to the scheme, the filtering parameter of the frequency converter is adjusted according to the harmonic condition generated by the frequency converter, and the harmonic filtering effect of the frequency converter can be improved.
Description
Technical field [0001] The present invention belongs to the technical field drive, particularly relates to a control device for a harmonic drive, and the drive method, harmonic detection and suppression apparatus in particular relates to a power applied to the inverter, the power inverter and methods . Background technique [0002] Using the inverter-driven motor system, because of its significant energy saving, easy to adjust, easy maintenance, network, etc., are more widely used; but its linearity, impact electricity embodiment, interference caused by too much attention, especially in this high-power high-capacity drive problem is more prominent. The filter parameters of a single drive, the drive of the problems of poor harmonic filtering effect. [0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent the above content is prior art. Inventive content [0004] Object of the present invention is t...
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IPC IPC(8): H02M5/458H02M1/12H02M1/32H02J3/01
CPCH02M5/4585H02M1/126H02M1/32H02J3/01Y02E40/40
Inventor 张旗旗张统世周维邦赵文超归柒荣
Owner GREE ELECTRIC APPLIANCES INC