Neutral-point voltage control system and method for parameter on-line tuning

A technology of DC bus voltage and DC bus midpoint, which is applied in the field of midpoint voltage control system, can solve problems such as midpoint voltage fluctuation, achieve the effects of reducing output voltage, improving output waveform quality, and facilitating digital realization
CN104601028AInactive Publication Date: 2015-05-06NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF SCI & TECH
Publication Date
2015-05-06
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a neutral-point voltage control system for parameter on-line tuning and a neutral-point voltage control method for parameter on-line tuning. The neutral-point voltage control system comprises a three-level inverter and a digital processing control module, wherein the digital processing control module comprises a sampling unit, a digital phase-locked loop unit, an output loop-closed control unit, a PI parameter online tuning unit, a neutral-point voltage PI control unit and an SVPWM (Space Vector Pulse Width Modulation) vector control unit; the output end of the SVPWM vector control unit is connected with each phase bridge arm of the three-level inverter through a driving circuit. The direct-current bias of the neutral-point voltage and the neutral-point voltage fluctuation can be restrained by the system and the method, so that the neutral-point voltage balance control can be realized.
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Description

technical field

[0001] The invention belongs to the field of control technology in power electronic conversion technology, in particular to a midpoint voltage control system and method for parameter online setting. Background technique

[0002] With the rapid development of power electronic devices, high-voltage and high-power power electronic devices and AC speed control systems have been widely used in steelmaking and rolling industrial systems, electrochemical industrial systems, railway ship power systems and other fields. These power electronic devices have the characteristics of high control requirements, high power, high voltage level, and complex systems. Two-level inverters have many limitations such as high switching loss, high electromagnetic interference, and high voltage stress on the switch tubes, making it difficult for two-level inverters to meet these applications. Compared with the two-level inverter, the multi-level inverter has more output levels, and th...

Claims

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