NPC (neutral point clamped) three-level inverter vector control system based on novel flux observer

A technology of three-level inverter and flux linkage observer, applied in vector control system, control system, motor generator control and other directions, can solve the problems of affecting the accuracy of flux linkage estimation, complicated calculation, DC offset, etc.

Inactive Publication Date: 2013-10-02
HENAN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The SVPWM modulation algorithm is widely used in the NPC three-level inverter control system because of its high voltage utilization rate, low harmonic content of the output waveform, and easy digital realization. chain estimation accuracy
In the vector control system, the observation of the...

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  • NPC (neutral point clamped) three-level inverter vector control system based on novel flux observer
  • NPC (neutral point clamped) three-level inverter vector control system based on novel flux observer
  • NPC (neutral point clamped) three-level inverter vector control system based on novel flux observer

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Embodiment Construction

[0031] The vector control system of NPC three-level inverter based on SVPWM simplified algorithm includes the following steps:

[0032] The first step is to establish the main circuit of the NPC three-level inverter, which is characterized by: each phase of the inverter requires 4 IGBT switch tubes, 4 freewheeling diodes, and 2 clamping diodes; the entire three-phase inverter The DC side of the converter consists of two capacitors , Connect in series to support and balance the DC side voltage, . Through a certain switch logic control, three phase voltages of voltage are generated on the AC side, and sine waves are synthesized at the output end. The mathematical model of the three-level inverter is, let , , Is the switching function of the three phases of inverter A, B, C, , The inverter output phase voltage is expressed as , The whole three-level inverter has three phases of 3×3×3=27 groups of output states. image 3 As shown in the simplified model of the main circuit of...

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Abstract

An NPC (neutral point clamped) three-level inverter vector control system based on a novel flux observer provides a simplified SVPWM (space vector pulse width modulation) algorithm. A three-level space vector is decomposed into a two-level space vector; a reference voltage vector is translated; a two-level SVPWM algorithm is used to obtain action time of each basic vector and to choose a right switching status; and the three-level inverter vector control calculation is reduced. Meanwhile, in the invention, the novel flux observer is employed to calculate the rotor flux, so that a current model and a voltage model are used respectively at a low speed and at a high speed; and when a rotation speed is between the low speed and the high speed, an invented hybrid flux observer is used to calculate the rotor flux.

Description

Technical field [0001] The invention belongs to the field of high-voltage and high-power AC variable frequency speed regulation, and relates to a simplified SVPWM algorithm based on a diode clamped (NPC) three-level inverter, vector control of an induction motor and a novel hybrid flux observer. Background technique [0002] Since the NPC three-level inverter topology was proposed, after years of development and research, it has now been widely used in high-voltage and high-power inverter occasions. The characteristic of this type of topology is that the voltage value of each switching device is equivalent to half of the original DC voltage, so that low-voltage high-speed switching devices (IGBT, etc.) can be used to replace high-voltage low-speed switching devices (GTO, etc.). Its , The common mode interference is relatively small, which greatly reduces the electromagnetic interference and the peak voltage on the motor winding. In AC speed regulation, the insulation performanc...

Claims

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Application Information

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IPC IPC(8): H02P21/13H02P21/14H02P27/08
Inventor 范波谢冬冬许惠赵伟刚
Owner HENAN UNIV OF SCI & TECH
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