Hybrid four-level rectifier

A four-level, rectifier technology, applied in the electrical field, can solve the problems of high production cost, high cost, poor switching performance, etc.

Active Publication Date: 2018-10-16
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the voltage level of high-voltage power semiconductor devices is limited, and the higher the voltage level, the higher the cost, and the poor switching performance
[0004] Although there

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] see figure 1 , Figure 12 and Figure 13 , a hybrid four-level rectifier, mainly including A-phase circuit, B-phase circuit, C-phase circuit, capacitor C 1 , capacitance C 2 , capacitance C 3 and resistor R.

[0080] Further, the switching tube in this circuit is an IGBT or a MOSFET. The switching tube of this implementation adopts MOSFET.

[0081] Further, the capacitor C 1 , capacitance C 1 and capacitance C 3 The specifications are the same.

[0082] Note capacitance C 1 The two ends are the g-terminus and the h-terminus respectively. Note capacitance C 2 The two ends are h end and j end respectively. Note capacitance C 3 The two ends of are j-terminal and k-terminal respectively.

[0083] A-phase circuit, B-phase circuit and C-phase circuit are connected in parallel and connected to terminal g. Capacitance C 1 And the capacitor C2 is connected in series through the h terminal. Capacitance C 2 and capacitance C 3 Connected in series through the j ...

Embodiment 2

[0110] When the input voltage is in the positive half cycle, the mixed four-level rectified output level U dc The corresponding equivalent circuit of phase A is as follows figure 2 As shown, the solid line is the on-circuit, and the dotted line is the off-circuit. That is, the switching tube S in the phase A circuit of the hybrid four-level rectifier a1 and diode D a1 conduction, the switch tube S a2 , switch tube S a3 , switch tube S a4 and diode D a2 、D a3 、D a4 disconnect. The B-phase equivalent circuit, the C-phase equivalent circuit, and the A-phase equivalent circuit are the same.

[0111] When the input voltage is in the positive half cycle, the mixed four-level rectified output level is 2 / 3U dc The corresponding equivalent circuit of phase A is as follows image 3 As shown, the solid line is the on-circuit, and the dotted line is the off-circuit. That is, the switching tube S in the phase A circuit of the hybrid four-level rectifier a2 , switch tube S a3...

Embodiment 3

[0117] see Figure 11 , the hybrid four-level rectifier also includes a voltage-oriented control system.

[0118] The voltage-oriented control system uses a PI regulator to realize static-difference-free control.

[0119] The voltage-oriented control system mainly includes a voltage outer loop and a current inner loop.

[0120] The voltage outer loop transfers active power through the stabilized DC bus voltage.

[0121] The current inner loop performs closed-loop control on active current and reactive current. Among them, when the reactive current command is set to 0, the hybrid four-level rectifier operates under the condition of unity power factor. The power factor is 1, which means that the phases of voltage and current coincide, and there are no harmonics. When there are inductance and capacitance in the circuit, the phases of voltage and current will not always coincide, and the phases of sinusoidal signals will not coincide. Capacitive: Current leads voltage. Induct...

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PUM

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Abstract

The invention discloses a hybrid four-level rectifier, which mainly comprises an A-phase circuit, a B-phase circuit, a C-phase circuit, a capacitor C1, a capacitor C2, a capacitor C3 and a resistor R,wherein two ends of the capacitor C1 are recorded as a g end and an h end separately; two ends of the capacitor C2 are recorded as an h end and a j end separately; two ends of the capacitor C3 are recorded as a j end and a k end separately; the A-phase circuit, the B-phase circuit and the C-phase circuit are connected in parallel and then connected to the g end; the capacitor C1 is connected withthe capacitor C2 through the h ends in series; the capacitor C2 is connected with the capacitor C3 through the j ends in series; and the k end of the capacitor C3 is connected with the resistor R inseries and then connected to the g end. According to the hybrid four-level rectifier, the number of output levels is increased, reduction of voltage stress of a switching device is facilitated and theswitching device is applicable to medium-voltage high-power occasions. According to the hybrid four-level rectifier, the harmonic distortion rate of input current is also reduced, the switching lossof a converter is reduced, the switching frequency of the converter is improved, the volume of a passive device is reduced and the power density of the converter can be improved. The hybrid four-levelrectifier is applicable to medium-voltage high-power application occasions and low-voltage high-power density application occasions.

Description

technical field [0001] The invention relates to the electrical field, in particular to a hybrid four-level rectifier. Background technique [0002] Medium and high voltage inverters are widely used in industrial fields such as charging piles, communication power supplies, industrial inverters, and AC / DC transmission systems. The rectifier unit is an important part of the medium and high voltage inverter. [0003] Power semiconductor devices such as insulated gate bipolar transistors are widely used in the field of medium and high voltage inverters. However, at present, the voltage level of high-voltage power semiconductor devices is limited, and the higher the voltage level, the higher the cost, and the poor switching performance. [0004] Although there are two-level and three-level converters with multiple IGBTs connected in series on the market, their design and layout have problems such as poor reliability, large commutation circuits, and high production costs. Theref...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/12
CPCH02M1/12H02M7/219H02M1/0048Y02B70/10
Inventor 陈剑飞李剑
Owner CHONGQING UNIV
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