CN-224218292-U - High-gain bidirectional quasi-Z source T-type three-level inverter

CN224218292UCN 224218292 UCN224218292 UCN 224218292UCN-224218292-U

Abstract

The utility model relates to the technical field of inverters, in particular to a high-gain bidirectional quasi-Z source T-type three-level inverter. The inverter consists of a direct-current voltage source V g , a filter capacitor C g1 、C g2 , a quasi-Z source network (consisting of a capacitor C Z1 ～C Z3 and an inductor L 1 ～L 8 ), an active switch inductance unit S L1 ～S L4 , a switch tube S 01 、S 02 and a T-shaped three-level inverter P. The quasi-Z source network and the active switch inductance unit form a bidirectional energy transmission path through a specific capacitance polarity and inductance connection mode, and the fully-controlled switching tube and the quasi-Z source structure cooperatively realize energy storage and release adjustment of energy, so that the inverter realizes voltage gain adjustment and energy bidirectional flow on the basis of having multi-level output capability, and is suitable for photovoltaic grid connection and other application occasions needing bidirectional power conversion.

Inventors

TIAN ZHIYUN
YAN JINGBIN
ZHAO YU
WEN JIAJUN
ZHANG CHAO

Assignees

哈尔滨理工大学

Dates

Publication Date: 20260508
Application Date: 20241113

Claims (5)

1. A high-gain bidirectional quasi-Z source T-type three-level inverter is characterized by comprising a direct-current voltage source V g , the DC voltage source V is connected with the filter capacitors C1 and C in parallel, the filter capacitors C and C are connected in series, the anode of the capacitor C in the positive active switch inductance unit S of the DC voltage source V is connected with the node connected with the anode of the inductor L, the anode of the capacitor C is connected with the node connected with the anode of the capacitor C in the active switch inductance unit S and the anode of the inductor L, the anode of the capacitor C is connected with the node connected with the collector of the switch tube S and the cathode of the diode D, the anode of the capacitor C is connected with the node connected with the anode of the capacitor C in the active switch inductance unit S and the anode of the inductor L, the anode of the capacitor C is connected with the anode of the diode D, the anode of the capacitor C is connected with the anode of the inductor D, the anode of the capacitor C is connected with the anode of the diode D, and the anode of the capacitor C is connected with the anode of the diode D 3 The positive electrode of the capacitor C Z3 is connected with the positive electrode of the direct current side of the T-shaped three-level inverter P, the negative electrode of the inductor C 8 in the active switch inductance unit S L4 is connected with the positive electrode of the inductor L 7 , the negative electrode of the capacitor C Z3 is connected with the negative electrode of the direct current side of the T-shaped three-level inverter P, the positive electrode of the inductor L 5 in the active switch inductance unit S L3 is connected with the negative electrode of the capacitor C 6 , and the collector of the switch tube S 02 is connected with the negative electrode of the diode D 02 .
2. The inverter of claim 1, wherein the active switching inductance units S L1 ,S L2 ,S L3 and S L4 are each composed of two capacitors, two inductors, two capacitors, and a capacitor, In the active switching inductance unit S, the capacitor Cpositive electrode is connected with the inductor Lpositive electrode, the capacitor Cnegative electrode is connected with the node connected with the collector of the switching tube S and the cathode of the diode D, the capacitor Cnegative electrode is connected with the inductor Lnegative electrode, the capacitor Cnegative electrode is connected with the node connected with the anode of the switching tube S and the cathode of the diode D, the capacitor Cpositive electrode is connected with the inductor Lnegative electrode, the capacitor Cpositive electrode is connected with the inductor Lpositive electrode, the capacitor Cnegative electrode is connected with the node connected with the collector of the switching tube S and the cathode of the diode D, the capacitor Cnegative electrode is connected with the node connected with the emitter of the switching tube S and the anode of the diode D, the capacitor Cnegative electrode is connected with the inductor Lpositive electrode, the capacitor Cpositive electrode is connected with the inductor Lnegative electrode, the capacitor Cpositive electrode is connected with the node connected with the collector of the switching tube S and the cathode of the diode D, the capacitor Cnegative electrode is connected with the capacitor L negative electrode, the capacitor Cpositive electrode is connected with the capacitor L positive electrode, the capacitor Cpositive electrode is connected with the capacitor D and the capacitor L positive electrode is connected with the capacitor L positive electrode of the diode D 6 In the active switch inductance unit S L4 , the anode of the capacitor C 8 is connected with the anode of the inductance L 8 , meanwhile, the anode of the capacitor C 7 is connected with the cathode of the inductance L 7 , the anode of the capacitor C 8 is connected with the anode of the inductance L 7 , and the anode of the capacitor C 7 is connected with the anode of the inductance L 8 .
3. The inverter of claim 1, wherein the capacitor C 1 ＝C 2 ＝C 3 ＝C 4 ＝C 5 ＝C 6 ＝C 7 ＝C 8 and the inductor L 1 ＝L 2 ＝L 3 ＝L 4 ＝L 5 ＝L 6 ＝L 7 ＝L 8 are formed.
4. The inverter of claim 1, wherein the switching tubes are IGBTs and the switching tubes S 01 and S 02 are fully controlled switching tubes, so that the Z-source inverter has energy bi-directional flow capability.
5. The inverter of claim 1, wherein the bidirectional energy flow is realized by adding the active switching inductance and the full-control switching tube, the range of the output voltage is further widened on the basis that the T-type three-level inverter can output multi-level voltage, and high gain is realized.

Description

High-gain bidirectional quasi-Z source T-type three-level inverter Technical Field The utility model relates to the technical field of inverters, in particular to a high-gain bidirectional quasi-Z source T-type three-level inverter. Technical Field The new energy represented by solar energy has the advantages of wide distribution, low carbon, environmental protection, abundant reserves and the like, and the great development of the new energy power generation technology is the most effective means for relieving the current energy consumption and environmental problems. In recent years, new energy power generation technology is rapidly developed, and a plurality of distributed power generation systems based on new energy are connected to a micro-grid, which causes the quality of power supply of the micro-grid to be reduced, even impacts on a large power grid and influences the stability of the large power grid. This is a challenge that current research needs to face. In the practical process of the new energy power system, the key component is a grid-connected inverter, which needs to complete the function of voltage up/down conversion and meet the requirement of wide voltage range. Meanwhile, photovoltaic power generation has the characteristic of strong intermittence and randomness. The bidirectional quasi-Z source inverter has the characteristic of large input voltage adjustable range, and is more suitable for photovoltaic grid-connected power generation with large input range. In order to solve the problems, the utility model provides a high-gain bidirectional quasi-Z source T-type three-level inverter, which has the characteristic of large adjustable range of input voltage, can realize bidirectional flow of energy, and is more suitable for photovoltaic grid-connected power generation with larger input range. Disclosure of utility model The utility model aims to provide a high-gain bidirectional quasi-Z-source T-shaped three-level inverter, which solves the problems that the traditional Z-source T-shaped inverter is not strong in boosting capacity and cannot flow in two directions. The switching tubes S 01 and S 02 are full-control switching tubes, so that the Z-source inverter has energy bidirectional flow capacity, and bidirectional flow of energy is realized by adding the active switching inductance and the full-control switching tubes, so that the Z-source inverter is more suitable for photovoltaic grid-connected power generation with a larger input range. The high-gain bidirectional quasi-Z source T-type three-level inverter is characterized by comprising a direct-current voltage source V g, filter capacitors C g1 and C g2, capacitors C1、C2、C3、C4、C5、C6、C7、C8、CZ1、CZ2 and C Z3, an inductor L 1、L2、L3、L4、L5、L6、L7、L8, a switching tube S 01、S02, a diode D 01、D02, active switching inductance units S L1,SL2,SL3 and S L4 and a T-type three-level inverter P. The direct-current voltage source V g is connected with the filter capacitors C g1 1 and C g2 in parallel, the filter capacitors C g1 and C g2 are connected in series, and the negative electrode of the capacitor C 1 in the positive electrode active switch inductance unit S L1 of the direct-current voltage source V g is connected with a node connected with the positive electrode of the inductance L 2. The positive electrode of the capacitor C Z1 is connected with a node of the positive electrode of the capacitor C 3 in the active switch inductance unit S L2 and the positive electrode of the inductor L 4, and is connected with a node of the negative electrode of the diode D 4 and the collector of the switch tube S 4, the negative electrode of the capacitor C 4 is connected with a node of the positive electrode of the capacitor C 4 in the active switch inductance unit S 4 and the negative electrode of the inductor L 4, and is connected with a point of the positive electrode of the switch tube S 4 and the positive electrode of the diode D 4, and is connected with a point of the positive electrode of the inductor C 4 in the active switch inductance unit S 4 and the negative electrode of the inductor L 4, and is connected with a point of the positive electrode of the capacitor C 4 in the active switch inductance unit S 4 and a point of the negative electrode of the inductor L 4, and a point of the positive electrode of the capacitor C 4 in the positive electrode of the active switch inductance unit S 4 and a point of the negative electrode of the inductor L 4 are connected with a point of the positive electrode of the inductor C 4 in the T-type three-level inverter P, and a point of the positive electrode of the capacitor C 4 in the positive electrode of the capacitor C 4 is connected with a point of the positive electrode of the inductor C 4 in the active switch inductance unit S 4 and a point of the negative electrode of the inductor S 4 is connected with a point of the positive electrode of the negative electrode of the inductor C 4 in the positive electrode