A mixed modulating method for three level high-voltage transducer

A high-voltage frequency converter and hybrid modulation technology, applied in the direction of converting irreversible DC power input into AC power output, electrical components, output power conversion devices, etc., can solve the problem of three-level PWM technology with a single PWM method, storage Higher volume requirements, not flexible enough control, etc., to improve waveform quality, not increase storage capacity, and improve system efficiency
CN101018020AInactive Publication Date: 2007-08-15TSINGHUA UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2007-08-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The disclosed modulation technology for three-level high-voltage frequency converter comprises: to three-level NPC frequency converter, using asynchronous SVPWM when frequency less than 45Hz, and obtaining switch frequency as 600Hz; using special eliminating-harmonic PWM when frequency over 45Hz, and obtaining the switch number is seven. This invention avoids defects of space-vector PWM and special eliminating-harmonic PWM, improves waveform quality, reduces heat loss and request on filter, and ensures system security and reliability.
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Description

technical field

[0001] The invention belongs to the technical field of power electronics application, and is aimed at the generation of PWM pulses of three-level high-voltage frequency converters. Space vector PWM is adopted at low frequencies, the DC bus voltage utilization rate is high, and it is easy to digitize. Specific harmonic elimination PWM is adopted at high frequencies to eliminate The low-order harmonics are reduced, the waveform quality is improved, and the heat loss can be greatly reduced. The method of switching at a fixed angle ensures smooth switching between the two PWMs. Background technique

[0002] Compared with the two-level diode neutral point clamped (Neutral Point Clamped) three-level inverter, it can use low withstand voltage devices to achieve high voltage and large capacity, the output waveform is closer to sinusoidal, and the device’s bearing capacity can be reduced under the same DC bus voltage. Compressive stress is one of the main application...

Claims

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