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Tri-level inversion indirect vector control system based on simplified SVPWM (space vector pulse width modulation)

A technology of three-level inverter and three-level inverter, which is applied in the direction of vector control system, control system, motor generator control, etc., can solve the problem of breakdown of DC side capacitance, increase of voltage stress of switching devices, increase of Output voltage waveform harmonic content and other issues

Inactive Publication Date: 2013-08-14
HENAN UNIV OF SCI & TECH
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Problems solved by technology

The unbalanced capacitor voltage will increase the harmonic content of the output voltage waveform, and at the same time increase the voltage stress of the switching device, and even damage the switching device and break down the DC side capacitor

Method used

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  • Tri-level inversion indirect vector control system based on simplified SVPWM (space vector pulse width modulation)
  • Tri-level inversion indirect vector control system based on simplified SVPWM (space vector pulse width modulation)
  • Tri-level inversion indirect vector control system based on simplified SVPWM (space vector pulse width modulation)

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Embodiment Construction

[0024] A three-level inverter indirect vector control system based on simplified SVPWM, including the following steps:

[0025] The first step is to establish the main circuit of the NPC three-level inverter. Each phase of the inverter needs 4 IGBT switch tubes, 4 freewheeling diodes, and 2 clamping diodes; the DC side of the entire three-phase inverter is composed of Two capacitors Cl and C2 are connected in series to support and balance the DC side voltage, Cl=C2. Through a certain switching logic control, the phase voltage of the three voltages is generated on the AC side, and a sine wave is synthesized at the output terminal. The mathematical model of the three-level inverter is, let , , is the switching function of the three phases of inverter A, B, and C, then, , the output phase voltage of the inverter is expressed by the switching function as , there are 3×3×3=27 sets of output states in the three phases of the whole three-level inverter, as image 3 The sim...

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Abstract

The invention relates to a tri-level inversion indirect vector control system based on simplified SVPWM (space vector pulse width modulation). On bases of the SVPWM simplification algorithm under a 60-degree coordinate system, an asynchronous motor dynamic mathematical model, a vector control fundamental principle and a main circuit in the step A, the tri-level inverter vector control system based on network parameter control (NPC) is established. The method dispenses with judgment that a reference voltage vector is in a large section or a small section, as well as a great deal of trigonometric functional operation, and only requires simple logical judgment, so that nearest three vectors for synthesizing the reference voltage vector can be obtained; and meanwhile, an output switch state equation is introduced in the algorithm, so that midpoint electric potential balance on the direct current side can be effectively controlled, and the method can be easily popularized to inverters with higher level.

Description

technical field [0001] The invention belongs to the field of high-voltage and high-power AC frequency conversion speed regulation, and relates to an indirect vector control system of a diode clamp type (NPC) three-level inverter based on a simplified SVPWM algorithm. Background technique [0002] Since the NPC three-level topology was proposed, it has been widely used in the fields of medium and high voltage AC motor drives, reactive power compensation in power grids, and new energy power generation. Compared with the two-level inverter, the NPC three-level inverter has the characteristics that the output voltage is closer to the sine wave, the voltage change rate is small, the equivalent switching frequency is high, and the harmonic wave is small. However, since the load current passes through the bridge arms of each phase, a certain current will be generated at the midpoint of the DC side, which will make the voltage of the voltage dividing capacitor unbalanced. The unbal...

Claims

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Application Information

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IPC IPC(8): H02P21/08H02P27/08H02M7/487
Inventor 范波赵伟刚许惠史光辉谢冬冬
Owner HENAN UNIV OF SCI & TECH
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