Suppression method for bus voltage fluctuation in high-voltage frequency converter
A high-voltage inverter, bus voltage technology, applied in electrical components, output power conversion devices, AC power input conversion to AC power output, etc. Influence and suppress the effect of bus voltage fluctuation
Active Publication Date: 2015-12-09
SHANGHAI STEP ELECTRIC +1
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Problems solved by technology
However, this technology can only optimize the grid-side current and voltage waveforms in the topology of the high-voltage inverter, and has no effect on the fluctuation of the bus voltage caused by power mismatch; the second method is to suppress the bus by increasing the given voltage Fluctuations, but this puts higher requirements on the withstand voltage of capacitors, IGBTs, driver boards, etc.
The third method is to suppress fluctuations by increasing the number of capacitors, but this increases the volume of the inverter and increases the cost
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[0021] In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.
[0022] In order to obtain high output voltage with low withstand voltage devices, reduce the rate of change of output voltage over time and suppress harmonics, engineers have designed multi-level converters. In high-voltage frequency converters (such as working voltages of 3KV, 6KV, and 10KV), cascaded multilevel converters ...
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The invention relates to the technical field of motor control, and discloses a suppression method for bus voltage fluctuation in a high-voltage frequency converter. The suppression method for the bus voltage fluctuation in the high-voltage frequency converter includes the following step: adding zero-sequence components into modulating waves of an inverter of the high-voltage frequency converter. In this way, the bus voltage fluctuation of the high-voltage frequency converter can be suppressed, the adverse influence on current loop control of a PWM rectifier AFE is reduced, the lifetime of a capacitor in the frequency converter can be extended, and the damage to the sine degree of output waveform of the frequency converter is reduced.
Description
technical field [0001] The invention relates to the technical field of motor control, in particular to a method for suppressing bus voltage fluctuations in a high-voltage frequency converter. Background technique [0002] When the motor works in the second and fourth quadrants, it is in the generator state, and the electric energy is fed back to the DC bus capacitor of the inverter. The ordinary two-quadrant inverter can only consume this part of electric energy through the braking resistor. However, the four-quadrant inverter composed of filter inductors and IGBTs (insulated gate bipolar transistors) uses PWM (pulse width modulation) rectification technology. The waveform of the input side current allows the inverter to run in the state of "unity power factor", avoiding the harmonic pollution caused by the uncontrolled rectification of the diode or the phase-controlled rectification of the thyristor to the power grid, and obtaining good motor speed regulation performance. ...
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Inventor 王璐琤王亮平张盛孟庆旭
Owner SHANGHAI STEP ELECTRIC