Three-power-supply three-phase efficient elevator energy recovery multi-level converter

Abstract

The utility model relates to a three-power three-phase efficient elevator energy recovery multi-level converter, which comprises a first direct-current voltage source, a second direct-current voltage source, a third direct-current voltage source, a first direct-current bus capacitor, a second direct-current bus capacitor and a third direct-current bus capacitor, the first DC voltage source is connected in parallel with a first DC bus capacitor, the second DC voltage source is connected in parallel with a second DC bus capacitor, the third DC voltage source is connected in parallel with a third DC bus capacitor, the anode end of the first DC voltage source is connected with the DC bus anode P end, and the cathode end of the third DC voltage source is connected with the DC bus cathode N end; the direct-current bus positive pole P end and the direct-current bus negative pole N end are connected with the input ends of the A-phase converter, the B-phase converter and the C-phase converter respectively, and the output ends of the A-phase converter, the B-phase converter and the C-phase converter are connected with the traction motor. The efficiency of the elevator energy recovery converter can be effectively improved, and consumption reduction and energy conservation are achieved.

Description

Technical Field

[0001] The utility model relates to a three - power - supply three - phase high - efficiency elevator energy - recovery multilevel converter. Background Art

[0002] The elevator energy - recovery converter is an extremely important part of the elevator control system, directly affecting the performance of the elevator control system. With the progress of technology and the development of society, higher requirements are put forward for elevator converters. First, the efficiency of the elevator energy - recovery converter should be improved as much as possible to achieve energy consumption reduction and energy conservation. Second, the elevator converter should output high - quality voltage and be able to more accurately control the speed and torque of the elevator system motor. Third, it should be able to achieve bidirectional energy flow. During the elevator's downward movement, mechanical energy is converted into electrical energy, and this part of electrical energy can be effectively fed back to the power grid to save electrical energy.

[0003] If a traditional three - phase diode uncontrolled rectifier is used in the elevator control system, only single - phase energy flow can be achieved, and the output voltage quality is poor, and the torque and speed of the motor cannot be effectively controlled.

[0004] For a two - level converter using silicon - based fully - controlled devices, although bidirectional energy flow can be achieved, due to the small number of output voltage levels, the control accuracy of the motor speed and torque is limited, and the silicon - based fully - controlled devices have large switching losses and on - state losses, resulting in low efficiency.

[0005] Therefore, it is urgent to propose an elevator converter with high efficiency, high - quality output voltage, and bidirectional energy flow. Content of the Utility Model

[0006] The purpose of the utility model is to provide a three - power - supply three - phase high - efficiency elevator energy - recovery multilevel converter to overcome the existing defects, which can effectively improve the efficiency of the elevator energy - recovery converter and achieve energy consumption reduction and energy conservation.

[0007] The technical solution to achieve the above purpose is as follows:

[0008] A three - power - supply three - phase high - efficiency elevator energy - recovery multilevel converter, comprising: a first DC voltage source, a second DC voltage source, a third DC voltage source, a first DC bus capacitor, a second DC bus capacitor, a third DC bus capacitor, and three completely symmetrical phase - converters, namely, a phase - A converter, a phase - B converter, and a phase - C converter. The first DC voltage source, the second DC voltage source, and the third DC voltage source are connected in series in sequence. The first DC bus capacitor, the second DC bus capacitor, and the third DC bus capacitor are connected in series in sequence. The first DC voltage source is connected in parallel with the first DC bus capacitor. The second DC voltage source is connected in parallel with the second DC bus capacitor. The third DC voltage source is connected in parallel with the third DC bus capacitor. The positive terminal of the first DC voltage source is connected to the positive P - terminal of the DC bus. The negative terminal of the third DC voltage source is connected to the negative N - terminal of the DC bus. The positive P - terminal and the negative N - terminal of the DC bus are respectively connected to the input terminals of the phase - A converter, the phase - B converter, and the phase - C converter. The output terminals of the phase - A converter, the phase - B converter, and the phase - C converter are all connected to the traction motor.

[0009] Preferably, the connection modes of the phase - A converter, the phase - B converter, and the phase - C converter are completely the same. Then, the phase - A converter includes: a first silicon carbide fully - controlled device, a second silicon carbide fully - controlled device, a third silicon carbide fully - controlled device, a fourth silicon carbide fully - controlled device, a fifth silicon carbide fully - controlled device, a sixth silicon carbide fully - controlled device, a seventh silicon carbide fully - controlled device, an eighth silicon carbide fully - controlled device, a ninth silicon carbide fully - controlled device, and a tenth silicon carbide fully - controlled device.

[0010] The positive terminal of the first DC voltage source is connected to the drain terminal of the first silicon carbide fully - controlled device of the phase - A converter. The negative terminal of the first DC voltage source is respectively connected to the source terminal of the seventh silicon carbide fully - controlled device and the drain terminal of the eighth silicon carbide fully - controlled device of the phase - A converter.

[0011] The source terminal of the first silicon carbide fully - controlled device is respectively connected to the drain terminal of the seventh silicon carbide fully - controlled device and the drain terminal of the second silicon carbide fully - controlled device.

[0012] The source terminal of the second silicon carbide fully - controlled device is respectively connected to the drain terminal of the third silicon carbide fully - controlled device, the cathode terminal of the first SiC Schottky diode, and the drain terminal of the ninth silicon carbide fully - controlled device.

[0013] The source terminal of the eighth silicon carbide fully - controlled device is connected to the source terminal of the fourth silicon carbide fully - controlled device, the drain terminal of the fifth silicon carbide fully - controlled device, and the anode terminal of the second SiC Schottky diode.

[0014] The source terminal of the ninth silicon carbide fully - controlled device is respectively connected to the negative terminal of the second DC voltage source and the drain terminal of the tenth silicon carbide fully - controlled device.

[0015] The source terminal of the tenth silicon carbide fully-controlled device is connected to the source terminal of the fifth silicon carbide fully-controlled device and the drain terminal of the sixth silicon carbide fully-controlled device;

[0016] The source terminal of the sixth silicon carbide fully-controlled device is connected to the negative terminal of the third DC voltage source;

[0017] The source terminal of the third silicon carbide fully-controlled device is respectively connected to the negative terminal of the second SiC Schottky diode and one end of the first split inductor;

[0018] The drain terminal of the fourth silicon carbide fully-controlled device is respectively connected to the positive terminal of the first SiC Schottky diode and one end of the second split inductor;

[0019] The other ends of the first split inductor and the second split inductor are both connected to the traction motor.

[0020] Preferably, the negative terminal of the first DC voltage source is connected to the source terminal of the seventh silicon carbide fully-controlled device and the drain terminal of the eighth silicon carbide fully-controlled device of the A-phase converter through point O1 and X a1 ;

[0021] The negative terminal of the second DC voltage source is connected to the source terminal of the ninth silicon carbide fully-controlled device and the drain terminal of the tenth silicon carbide fully-controlled device through point O2 and X a2 ;

[0022] Preferably, the source terminal of the first silicon carbide fully-controlled device is connected to the drain terminal of the seventh silicon carbide fully-controlled device and the drain terminal of the second silicon carbide fully-controlled device through point X a3 ;

[0023] The source terminal of the second silicon carbide fully-controlled device is connected to the drain terminal of the third silicon carbide fully-controlled device and the negative terminal of the first SiC Schottky diode through point X a4 ;

[0024] The source terminal of the third silicon carbide fully-controlled device is connected to the negative terminal of the second SiC Schottky diode and the first split inductor through point X a5 ;

[0025] The drain terminal of the fourth silicon carbide fully-controlled device is connected to the positive terminal of the first SiC Schottky diode and the second split inductor through point X a6 ;

[0026] The source terminal of the tenth silicon carbide fully-controlled device is connected to the source terminal of the fifth silicon carbide fully-controlled device and the drain terminal of the sixth silicon carbide fully-controlled device through point X a7 ;

[0027] The drain terminal of the fifth silicon carbide fully-controlled device is connected to the anode terminal of the second SiC Schottky diode and the source terminal of the fourth silicon carbide fully-controlled device through point X; a8 The anode terminal of the second SiC Schottky diode and the source terminal of the fourth silicon carbide fully-controlled device are connected through point X;

[0028] Both the first split inductor and the second split inductor are connected to the traction motor through point X; a9 The first split inductor and the second split inductor are both connected to the traction motor through point X.

[0029] Preferably, the current paths of the three-source three-phase high-efficiency elevator energy recovery multilevel converter include but are not limited to:

[0030] The first silicon carbide fully-controlled device - the second silicon carbide fully-controlled device - the third silicon carbide fully-controlled device - the first split inductor - the traction motor;

[0031] The seventh silicon carbide fully-controlled device - the second silicon carbide fully-controlled device - the third silicon carbide fully-controlled device - the first split inductor - the traction motor;

[0032] The tenth silicon carbide fully-controlled device - the fifth silicon carbide fully-controlled device - the second SiC Schottky diode - the first split inductor - the traction motor;

[0033] The sixth silicon carbide fully-controlled device - the fifth silicon carbide fully-controlled device - the second SiC Schottky diode - the first split inductor - the traction motor.

[0034] The beneficial effects of the present utility model are as follows:

[0035] 1) The present utility model uses silicon carbide fully-controlled devices. Compared with the fully-controlled devices made of traditional silicon materials, the switching loss and conduction loss are lower, which can effectively improve the efficiency of the elevator energy recovery converter and achieve energy consumption reduction and energy conservation;

[0036] 2) The present utility model adopts a new multilevel circuit, which increases the number of output voltage levels, and the output voltage is closer to a sine wave, enabling more precise control of the motor speed and torque;

[0037] 3) The present utility model can realize bidirectional energy flow. During the elevator's descent, mechanical energy is converted into electrical energy, and this part of electrical energy can be effectively fed back to the power grid, saving electrical energy;

[0038] 4) In the present utility model, three DC voltage sources are connected in series on the DC side, enabling the three capacitor voltages on the DC bus side to be maintained at about 1 / 3 of the total DC bus voltage without deviation, improving the output performance of the elevator energy recovery multilevel converter. Description of the Drawings

[0039] Figure 1 is the circuit diagram of a three-source three-phase high-efficiency elevator energy recovery multilevel converter of the present utility model;

[0040] Figure 2 It is a schematic diagram of the current path 1 of the three - power - source three - phase high - efficiency elevator energy - recovery multilevel converter in the present utility model;

[0041] Figure 3 It is a schematic diagram of the current path 2 of the three - power - source three - phase high - efficiency elevator energy - recovery multilevel converter in the present utility model;

[0042] Figure 4 It is a schematic diagram of the current path 3 of the three - power - source three - phase high - efficiency elevator energy - recovery multilevel converter in the present utility model;

[0043] Figure 5 It is a schematic diagram of the current path 4 of the three - power - source three - phase high - efficiency elevator energy - recovery multilevel converter in the present utility model. Detailed implementation manners

[0044] Next, the technical solutions of the present utility model will be clearly and completely described with reference to the accompanying drawings. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] Next, the present utility model will be further described with reference to the accompanying drawings.

[0046] As Figure 1 shown, a three - power - source three - phase high - efficiency elevator energy - recovery multilevel converter includes: a first DC voltage source V dc1 、a second DC voltage source V dc2 、a third DC voltage source V dc3 、a first DC bus capacitor C dc1 、a second DC bus capacitor C dc2 、a third DC bus capacitor C dc3 and three completely symmetric phase - converters, namely, phase - A converter, phase - B converter and phase - C converter. The first DC voltage source V dc1 、the second DC voltage source V dc2 and the third DC voltage source V dc3 are connected in series in sequence. The first DC bus capacitor C dc1 、the second DC bus capacitor C dc2 and the third DC bus capacitor C dc3 are connected in series in sequence. The first DC voltage source Vdc1 The first DC bus capacitor C is connected in parallel dc1 , the second DC voltage source Vdc2 is connected in parallel with the second DC bus capacitor Cdc2, the third DC voltage source Vdc3 is connected in parallel with the third DC bus capacitor Cdc3, and the anode terminal of the first DC voltage source V dc1 is connected to the positive terminal P of the DC bus, and the cathode terminal of the third DC voltage source V dc3 is connected to the negative terminal N of the DC bus. The positive terminal P and the negative terminal N of the DC bus are respectively connected to the input terminals of the phase A converter, the phase B converter, and the phase C converter. The output terminals of the phase A converter, the phase B converter, and the phase C converter are all connected to the traction motor M.

[0047] Three DC voltage sources are adopted on the DC side, namely the first DC voltage source V dc1 , the second DC voltage source V dc2 , and the third DC voltage source V dc3 are connected in series in turn, so that the voltages of the three DC bus capacitors on the DC bus side, namely the first DC bus capacitor C dc1 , the second DC bus capacitor C dc2 , and the third DC bus capacitor C dc3 can be maintained at about 1 / 3 of the total DC bus voltage without deviation, improving the output performance of the elevator energy recovery multilevel converter.

[0048] The currents output from the output terminals of the phase A converter, the phase B converter, and the phase C converter are respectively i a , i b , and i c , which are the output currents of the elevator energy recovery converter and are output to the traction motor M. The traction motor M is used to drive the elevator to rise or fall.

[0049] As Figure 1 shown, the connection methods of the phase A converter, the phase B converter, and the phase C converter are exactly the same. Taking the phase A converter as an example, the phase A converter includes: the first silicon carbide fully controlled device Q a1 , the second silicon carbide fully controlled device Q a2 , the third silicon carbide fully controlled device Q a3 , the fourth silicon carbide fully controlled device Q a4 , the fifth silicon carbide fully controlled device Q a5 , the sixth silicon carbide fully controlled device Q a6 , the seventh silicon carbide fully controlled device Q a7 , the eighth silicon carbide fully controlled device Q a8 , the ninth silicon carbide fully controlled device Q a9 , and the tenth silicon carbide fully controlled device Q a10 . The anode terminal of the first DC voltage source V dc1 is connected to the first silicon carbide fully controlled device Q of the phase A convertera1 The leakage extreme end, the first DC voltage source V dc1 The cathode extreme end of is respectively connected to the seventh silicon carbide fully controlled device Q of the A-phase converter a7 The source extreme end of and the eighth silicon carbide fully controlled device Q a8 The leakage extreme end of; The first silicon carbide fully controlled device Q a1 The source extreme end of is respectively connected to the leakage extreme end of the seventh silicon carbide fully controlled device Q a7 And the leakage extreme end of the second silicon carbide fully controlled device Q a2 The second silicon carbide fully controlled device Q a2 The source extreme end of is respectively connected to the leakage extreme end of the third silicon carbide fully controlled device Q a3 The leakage extreme end, the cathode extreme end of the first SiC Schottky diode D a3 And the leakage extreme end of the ninth silicon carbide fully controlled device Q a9 The eighth silicon carbide fully controlled device Q a8 The source extreme end of is connected to the source extreme end of the fourth silicon carbide fully controlled device Q a4 The source extreme end, the leakage extreme end of the fifth silicon carbide fully controlled device Q a5 And the anode extreme end of the second SiC Schottky diode D a4 The ninth silicon carbide fully controlled device Q a9 The source extreme end of is respectively connected to the cathode extreme end of the second DC voltage source V dc2 And the leakage extreme end of the tenth silicon carbide fully controlled device Q a10 The tenth silicon carbide fully controlled device Q a10 The source extreme end of is connected to the source extreme end of the fifth silicon carbide fully controlled device Q a5 The source extreme end and the leakage extreme end of the sixth silicon carbide fully controlled device Q a6 The sixth silicon carbide fully controlled device Q a6 The source extreme end of is connected to the cathode extreme end of the third DC voltage source V dc3 The third silicon carbide fully controlled device Q a3 The source extreme end of is respectively connected to the cathode extreme end of the second SiC Schottky diode D a4 And one end of the first split inductor L a1 The fourth silicon carbide fully controlled device Q a4 The leakage extreme end of is respectively connected to the anode extreme end of the first SiC Schottky diode D a3 And one end of the second split inductor L a2 One end of the first split inductor L a1 And the second split inductor L a2 The other ends of are all connected to the traction motor M.

[0050] In the embodiment, the cathode extreme end of the first DC voltage source V dc1 Passes through O1 and X a1 Points and the seventh silicon carbide fully controlled device Q of the A-phase converter a7 The source extreme end of and the eighth silicon carbide fully controlled device Qa8 The drain terminal is connected to the second DC voltage source V dc2 The cathode end passes through O2 and X a2 Point and the ninth silicon carbide fully controlled device Q a9 The source terminal and the tenth SiC fully controlled device Q a10 Drain terminal connection.

[0051] In the embodiment, the first silicon carbide fully-controlled device Q a1 The source terminal passes through X a3 Point and the seventh silicon carbide fully controlled device Q a7 The drain terminal and the second SiC fully controlled device Q a2 The drain terminal of the second silicon carbide fully controlled device Q a2 The source terminal passes through X a4 Point and the third silicon carbide fully controlled device Q a3 The drain terminal and the first SiC Schottky diode D a3 The cathode end of the third silicon carbide fully controlled device Q a3 The source terminal passes through X a5 Point and the second SiC Schottky diode D a4 The cathode terminal and the first split inductor L a1 Connection: Fourth SiC fully controlled device Q a4 The drain terminal passes through X a6 Point and the first SiC Schottky diode D a3 The anode terminal and the second split inductor L a2 Connection: The tenth silicon carbide fully controlled device Q a10 The source terminal passes through X a7 Point and the fifth silicon carbide fully controlled device Q a5 The source terminal and the sixth SiC fully controlled device Q a6 The drain terminal of the fifth silicon carbide fully controlled device Q a5 The drain terminal passes through X a8 Point and the second SiC Schottky diode D a4 The anode terminal and the fourth silicon carbide fully controlled device Q a4 The source terminal of the first split inductor L a1 and the second split inductor L a2 All passed X a9 The point is connected to the traction motor M.

[0052] In the embodiment, the current path of the three-power three-phase high-efficiency elevator energy recovery multi-level converter includes but is not limited to:

[0053] like Figure 2 As shown, the current path 1 of the three-power three-phase high-efficiency elevator energy recovery multi-level converter: the first silicon carbide fully controlled device Q a1 -The second silicon carbide fully controlled device Qa2 - The third fully controlled silicon carbide device Q a3 - The first split inductor L a1 - The traction motor M;

[0054] As Figure 3 shown, the current path 2 of the three - power - supply three - phase high - efficiency elevator energy - recovery multilevel converter: The seventh fully controlled silicon carbide device Q a7 - The second fully controlled silicon carbide device Q a2 - The third fully controlled silicon carbide device Q a3 - The first split inductor L a1 - The traction motor M;

[0055] As Figure 4 shown, the current path 3 of the three - power - supply three - phase high - efficiency elevator energy - recovery multilevel converter: The tenth fully controlled silicon carbide device Q a10 - The fifth fully controlled silicon carbide device Q a5 - The second SiC Schottky diode D a4 - The first split inductor L a1 - The traction motor M;

[0056] As Figure 5 shown, the current path 4 of the three - power - supply three - phase high - efficiency elevator energy - recovery multilevel converter: The sixth fully controlled silicon carbide device Q a6 - The fifth fully controlled silicon carbide device Q a5 - The second SiC Schottky diode D a4 - The first split inductor L a1 - The traction motor M.

[0057] The above - mentioned embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-power three-phase high-efficiency elevator energy recovery multi-level converter, characterized in that: include: The first DC voltage source (V dc1 ), the second DC voltage source (V dc2 ), the third DC voltage source (V dc3 )、The first DC bus capacitor (C dc1 )、The second DC bus capacitor (C dc2 )、The third DC bus capacitor (C dc3 ) and three completely symmetrical phase converters, namely, phase A converter, phase B converter and phase C converter, the first DC voltage source (V dc1 ), the second DC voltage source (V dc2 ) and a third DC voltage source (V dc3 ) are connected in series, the first DC bus capacitor (C dc1 )、The second DC bus capacitor (C dc2 ) and the third DC bus capacitor (C dc3 ) are connected in series, the first DC voltage source (V dc1 ) in parallel with the first DC bus capacitor (C dc1 ), the second DC voltage source (V dc2 ) in parallel with the second DC bus capacitor (C dc2 ), the third DC voltage source (V dc3 ) is connected in parallel with the third DC bus capacitor (C dc3 ), the first DC voltage source (V dc1 ) is connected to the positive terminal of the DC bus P, and the third DC voltage source (V dc3 ) the cathode end is connected to the negative N end of the DC bus, the positive P end of the DC bus and the negative N end of the DC bus are respectively connected to the input ends of the A-phase converter, the B-phase converter and the C-phase converter, and the output ends of the A-phase converter, the B-phase converter and the C-phase converter are all connected to the traction motor (M).

2. A three-power three-phase high-efficiency elevator energy recovery multi-level converter according to claim 1, characterized in that: The connection modes of the A-phase converter, the B-phase converter and the C-phase converter are completely the same. Then, the A-phase converter includes: a first silicon carbide fully controlled device (Q a1 )、The second SiC fully controlled device (Q a2 )、Third SiC Fully Controlled Device (Q a3 )、The fourth silicon carbide fully controlled device (Q a4 )、The fifth silicon carbide fully controlled device (Q a5 )、The sixth silicon carbide fully controlled device (Q a6 )、The seventh silicon carbide fully controlled device (Q a7 )、The eighth silicon carbide fully controlled device (Q a8 )、The ninth silicon carbide fully controlled device (Q a9 ) and the tenth SiC fully controlled device (Q a10 ), The first DC voltage source (V dc1 ) is connected to the anode end of the first silicon carbide fully-controlled device (Q a1 ) at the drain terminal, the first DC voltage source (V dc1 ) are connected to the cathode end of the seventh silicon carbide fully-controlled device (Q a7 ) source terminal and the eighth SiC fully controlled device (Q a8 ) of the drain terminal; The first fully controlled silicon carbide device (Q a1 ) are connected to the source terminals of the seventh silicon carbide fully controlled device (Q a7 ) and the second SiC fully controlled device (Q a2 ) of the drain terminal; The second SiC fully controlled device (Q a2 ) are connected to the source terminals of the third silicon carbide fully controlled device (Q a3 ) of the drain terminal, the first SiC Schottky diode (D a3 ) of the cathode terminal and the ninth SiC fully controlled device (Q a9 ) of the drain terminal; The eighth silicon carbide fully controlled device (Q a8 ) is connected to the source terminal of the fourth SiC fully controlled device (Q a4 ) source terminal, the fifth SiC fully controlled device (Q a5 ) of the drain terminal and the second SiC Schottky diode (D a4 ) at the anode end; The ninth silicon carbide fully controlled device (Q a9 ) are connected to the source terminals of the second DC voltage source (V dc2 ) of the cathode terminal and the tenth SiC fully controlled device (Q a10 ) of the drain terminal; The tenth silicon carbide fully controlled device (Q a10 ) is connected to the source terminal of the fifth SiC fully controlled device (Q a5 ) source terminal and the sixth SiC fully controlled device (Q a6 ) of the drain terminal; The sixth silicon carbide fully controlled device (Q a6 ) is connected to the source terminal of the third DC voltage source (V dc3 ) at the cathode end; The third silicon carbide fully controlled device (Q a3 ) are connected to the source terminals of the second SiC Schottky diodes (D a4 ) of the cathode terminal and the first split inductor (L a1 ) end; The fourth silicon carbide fully controlled device (Q a4 ) are connected to the drain terminals of the first SiC Schottky diodes (D a3 ) of the anode terminal and the second split inductor (L a2 ) end; The first split inductor (L a1 ) and the second split inductor (L a2 ) are connected to the traction motor (M).

3. A three-power three-phase high-efficiency elevator energy recovery multi-level converter according to claim 2, characterized in that: The first DC voltage source (V dc1 ) through the cathode end of O1 and X a1 The seventh silicon carbide fully controlled device (Q a7 ) source terminal and the eighth SiC fully controlled device (Q a8 )’s drain terminal connection; The second DC voltage source (V dc2 ) The cathode end passes through O2 and X a2 Point and the ninth SiC fully controlled device (Q a9 ) source terminal and the tenth SiC fully controlled device (Q a10 )’s drain terminal connection.

4. A three-power three-phase high-efficiency elevator energy recovery multi-level converter according to claim 2, characterized in that: The first fully controlled silicon carbide device (Q a1 ) through the source terminal of X a3 Point and the seventh SiC fully controlled device (Q a7 ) and the second SiC fully controlled device (Q a2 )’s drain terminal connection; The second SiC fully controlled device (Q a2 ) through the source terminal of X a4 Point and the third SiC fully controlled device (Q a3 ) of the drain terminal and the first SiC Schottky diode (D a3 )’s cathode terminal connection; The third silicon carbide fully controlled device (Q a3 ) through the source terminal of X a5 point with the second SiC Schottky diode (D a4 ) of the cathode terminal and the first split inductor (L a1 )connect; The fourth silicon carbide fully controlled device (Q a4 ) through the drain terminal of X a6 point with the first SiC Schottky diode (D a3 ) of the anode terminal and the second split inductor (L a2 )connect; The tenth silicon carbide fully controlled device (Q a10 ) through the source terminal of X a7 Point and the fifth SiC fully controlled device (Q a5 ) source terminal and the sixth SiC fully controlled device (Q a6 )’s drain terminal connection; The fifth silicon carbide fully controlled device (Q a5 ) through the drain terminal of X a8 point with the second SiC Schottky diode (D a4 ) of the anode terminal and the fourth SiC fully controlled device (Q a4 )’s source terminal connection; The first split inductor (L a1 ) and the second split inductor (L a2 ) are all through X a9 The point is connected to the traction motor (M).

5. A three-power three-phase high-efficiency elevator energy recovery multi-level converter according to claim 2, characterized in that: The current paths of the three-power three-phase high-efficiency elevator energy recovery multi-level converter include but are not limited to: The first fully controlled silicon carbide device (Q a1 )-The second SiC fully controlled device (Q a2 )-The third silicon carbide fully controlled device (Q a3 ) - First split inductance (L a1 )-traction motor (M); The seventh silicon carbide fully controlled device (Q a7 )-The second SiC fully controlled device (Q a2 )-The third silicon carbide fully controlled device (Q a3 ) - First split inductance (L a1 )-traction motor (M); The tenth silicon carbide fully controlled device (Q a10 )-Fifth SiC Fully Controlled Device (Q a5 )-Second SiC Schottky diode (D a4 ) - First split inductance (L a1 )-traction motor (M); The sixth silicon carbide fully controlled device (Q a6 )-Fifth SiC Fully Controlled Device (Q a5 )-Second SiC Schottky diode (D a4 ) - First split inductance (L a1 )-Traction motor (M).

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