CN201878020U - Integrated gate-commutated thyristor (IGCT)-based hybrid series H-bridge multi-level voltage frequency converter - Google Patents
Integrated gate-commutated thyristor (IGCT)-based hybrid series H-bridge multi-level voltage frequency converter Download PDFInfo
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- CN201878020U CN201878020U CN2010206233587U CN201020623358U CN201878020U CN 201878020 U CN201878020 U CN 201878020U CN 2010206233587 U CN2010206233587 U CN 2010206233587U CN 201020623358 U CN201020623358 U CN 201020623358U CN 201878020 U CN201878020 U CN 201878020U
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Abstract
The utility model relates to an integrated gate-commutated thyristor (IGCT)-based hybrid series H-bridge multi-level voltage frequency converter, which belongs to the technical field of electric driving, and comprises a rectifier unit, a direct current (DC) unit, an inverter unit and a dv/dt filter, wherein a secondary side of a multi-winding rectifier transformer is connected with an input of the rectifier unit, and an output of the rectifier unit is connected with an input of the DC unit; and an output of the DC unit is connected with the inverter unit, and an output of the inverter unit is connected with the dv/dt filter. In the utility model, the problem that the 10kV high-voltage large-capacity output can be obtained without directly connecting IGCT devices in series is solved, the impact on the frequency converter to a power grid in the work process is reduced, the sine degree of output voltage is improved, the control difficulty is relatively small, the reliability is enhanced, and the work stability of the system is improved; and the current harmonic waves of a power grid side are effectively suppressed, so that the distortion rate of linear current of an input side meets the standard requirements.
Description
Technical field
The utility model relates to a kind of mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT, belongs to the driven by power technical field.
Background technology
The world today, the energy becomes the pillar of the national economic development, and energy-conservation and environmental protection become developed country and the common problem of paying close attention to of developing country, show to have had energy development and saving are developed simultaneously, the requirement that saving is put in the first place.The saving of the energy mainly is the saving of electric energy after all.At present, high pressure heavy-duty motor equipment such as middle and high pressure fan, water pump, compressor and mixer use in enterprise such as mine, metallurgy, chemical industry, oil, light textile and water factory, power plant in a large number, and adopt baffle plate and valve regulated flow more, or operating in operating mode well below rated power throughout the year, energy waste is serious.Along with the continuous development of high-power electric and electronic technology, high voltage converter is widely used in high voltage and high power electromotor speed governing field, and shows obvious energy-saving effect.
At present, the high voltage converter that existing research is more successful adopts the three-level inverter topological structure that series multiplex structure and employing power device are directly connected more:
The inverter of respectively organizing of 1 series multiplex structure frequency converter is connected in many windings phase shifting transformer, just can obtain the high-power output of 10kV, because the introducing of output transformer makes the volume of frequency converter and cost increase greatly;
2 because the restriction of power device voltage withstand class must be chosen the identical or close power device of characteristic and connect, and to obtain the high-power output of 10kV, makes number of devices increase sharply the control system complexity;
3 for to satisfy the requirement of electrical network to the high voltage converter input harmonics, and the high voltage converter front end generally need install filter additional;
The output of 4 high voltage converters produces high dv/dt.
Summary of the invention
The utility model mainly is that the inverter of respectively organizing that solves existing in prior technology series multiplex structure frequency converter is connected in many windings phase shifting transformer, just can obtain the high-power output of 10kV, because the introducing of output transformer, the technical problem that makes that the volume of frequency converter and cost increase greatly etc.; A kind of structure that adopts many windings phase shifting transformer and six groups of mutual independent rectifiers is provided, can reduce high voltage converter Harmonic Interference to electrical network in the work engineering, guarantee that the total percent harmonic distortion THD of input current less than 5%, has also reduced the volume of frequency converter and the mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT of cost.
It is to solve existing in prior technology because the restriction of power device voltage withstand class that the utility model also has a purpose, must choose the identical or close power device of characteristic connects, to obtain the high-power output of 10kV, make number of devices increase sharply the technical problem of control system complexity etc.; A kind of structure that has adopted two level H-bridge inverters and three level H-bridge inversions series connection is provided, has obtained the high-voltage large-capacity output of 10kV, thereby overcome the mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT of the restriction that is subjected to the IGCT voltage withstand class.
It is that the solution existing in prior technology is to satisfy the requirement of electrical network to the high voltage converter input harmonics that the utility model has a purpose again, and the high voltage converter front end generally need install filter additional, the technical problem of the dv/dt that high voltage converter output generation is high etc.; A kind of adding dv/dt Filter Design is provided, has reduced the dv/dt of high voltage converter output, protected the mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT of the insulation of load motor.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals:
A kind of mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT is characterized in that: comprise
Many windings rectifier transformer (1): the three-phase voltage that the high pressure three-phase alternating current of electrical network is changed into 9 groups of phase shifts 6.67; And the grid side current harmonics effectively suppressed, make the line current aberration rate of input side satisfy the requirement of IEEE519-1992 standard;
Rectification unit (2): the secondary alternating voltage of many windings rectifier transformer (1) is become six groups of independently pulsating dc voltages, and described secondary alternating voltage is the three-phase voltage of above-mentioned 9 groups of phase shifts 6.67;
Direct current unit (3): the pulsating dc voltage after rectification unit (2) rectification is become galvanic current press, suppress the current changing rate of direct current unit output simultaneously;
Inversion unit (4): the three-phase high-voltage that the stable DC electricity of direct current unit (3) output is become the frequency adjustable joint;
Dv/dt filter (5): the dv/dt of inversion unit (4) output is suppressed, to satisfy of the requirement of load high-tension motor to frequency converter output dv/dt;
Wherein, the secondary of many windings rectifier transformer (1) is connected in the input of rectification unit (2), the output of rectification unit (2) is connected in the input of direct current unit (3), direct current unit (3) output is connected in inversion unit (4), and the output of inversion unit (4) is connected in dv/dt filter (5).
Above-mentioned mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT, described many windings rectifier transformer (1) comprises that former limit is the winding a1b1c1 that lengthened triangular is connected for the three phase winding UVW that the Y type connects with secondary, a2b2c2, a3b3c3, a4b4c4, a5b5c5, a6b6c6, a7b7c7, a8b8c8 and a9b9c9, the phase place of output voltage relative reference voltage is followed successively by-26.67,-20,-13.33,-6.67,0, + 6.67, + 13.33, + 20, + 26.67, described former limit input voltage 10kV, described secondary output voltage is 2020V.
Above-mentioned mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT, described rectification unit (2) comprises three group of six pulse wave rectifier device and three groups of 12 pulsating wave rectifiers, i.e. six pulse wave rectifier devices, one (6), six pulse wave rectifier devices, two (12), six pulse wave rectifier devices three (18), 12 pulsating wave rectifier one (9), 12 pulsating wave rectifier two (15) and 12 pulsating wave rectifier three (21), above-mentioned many windings rectifier transformer (1) secondary a1b1c1 is connected to the input of six pulse wave rectifier devices one (6); Secondary a2b2c2, a3b3c3 are connected to last six pulse wave rectifier devices input and the six pulse wave rectifier devices input down in the 12 pulsating wave rectifier one (9) mutually; Secondary a4b4c4 is connected to the input of six pulse wave rectifier devices two (12); Secondary a5b5c5, a6b6c6 are connected to last six pulse wave rectifier devices input and the six pulse wave rectifier devices input down in the 12 pulsating wave rectifier two (15) mutually; Secondary a7b7c7 is connected to the input of six pulse wave rectifier devices three (18); Secondary a8b8c8, a9b9c9 are connected to last six pulse wave rectifier devices input and the six pulse wave rectifier devices input down in the 12 pulsating wave rectifier three (21) mutually.
Above-mentioned mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT, described direct current unit (3) comprises one (7), two level DC unit two (13), two level DC unit and two level DC unit three (19), three level DC unit one (10), three level DC unit two (16) and three level DC unit three (22).
Above-mentioned mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT, described one (7), two level DC unit two (13), two level DC unit and two level DC unit three (19) comprise respectively:
Two level DC unit one (7) comprising: voltage transformer VT1a and direct current flat wave capacitor Cd1a two ends are connected to the positive and negative busbar of six pulse wave rectifier devices, one (6) output, and current sensor IT1a gathers the positive bus-bar electric current; Discharge switch KF1a and discharge resistance RF1a are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L1a one end and current-limiting resistance R1a one end is connected in positive bus-bar, the node of the current-limiting inductance L1a other end and current limliting diode Ds1a anode is connected in the positive bus-bar of two-level inverter one (8) input, current limliting diode Ds1a negative electrode, the current-limiting resistance R1a other end and clamp capacitor Cs1a one end are connected, and the clamp capacitor Cs1a other end is connected in negative busbar and is connected in the negative busbar of two-level inverter one (8) input;
Two level DC unit two (13) comprising: voltage transformer VT1b and direct current flat wave capacitor Cd1b two ends are connected to the positive and negative busbar of six pulse wave rectifier devices, two (12) outputs, and current sensor IT1b gathers the positive bus-bar electric current; Discharge switch KF1b and discharge resistance RF1b are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L1b one end and current-limiting resistance R1b one end is connected in positive bus-bar, the node of the current-limiting inductance L1b other end and current limliting diode Ds1b anode is connected in the positive bus-bar of two-level inverter two (14) inputs, current limliting diode Ds1b negative electrode, the current-limiting resistance R1b other end and clamp capacitor Cs1b one end are connected, and the clamp capacitor Cs1b other end is connected in negative busbar and is connected in the negative busbar of two-level inverter two (14) inputs;
Two level DC unit three (19) comprising: voltage transformer VT1c and direct current flat wave capacitor Cd1c two ends are connected to the positive and negative busbar of six pulse wave rectifier devices, three (18) outputs, and current sensor IT1c gathers the positive bus-bar electric current; Discharge switch KF1c and discharge resistance RF1c are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L1c one end and current-limiting resistance R1c one end is connected in positive bus-bar, the node of the current-limiting inductance L1c other end and current limliting diode Ds1c anode is connected in the positive bus-bar of two-level inverter three (20) inputs, current limliting diode Ds1c negative electrode, the current-limiting resistance R1c other end and clamp capacitor Cs1c one end are connected, and the clamp capacitor Cs1c other end is connected in negative busbar and is connected in the negative busbar of two-level inverter three (20) inputs.
Above-mentioned mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT, described three level DC unit one (10), three level DC unit two (16) and three level DC unit three (22) comprise respectively:
Three level DC unit one (10) comprising: the node of the node of voltage transformer VT2a and VT3a and direct current flat wave capacitor Cd2a and Cd3a is connected to the neutral point bus of 12 pulsating wave rectifier one (9) output, the other end of VT2a, the Cd2a other end and VT3a, Cd3a is connected in the positive and negative busbar of 12 pulsating wave rectifier one (9) output, and current sensor IT2a gathers the positive bus-bar electric current; Discharge switch KF2a and discharge resistance RF2a are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L2a one end and current-limiting resistance R2a one end is connected in positive bus-bar, the node of the current-limiting inductance L1a other end and current limliting diode Ds2a anode is connected in the positive bus-bar of three-level inverter one (11) input, and current limliting diode Ds2a negative electrode, the current-limiting resistance R2a other end and clamp capacitor Cs2a one end are connected; The node of clamp capacitor Cs2a and Cs3a is connected in the neutral point bus, the other end of current limliting diode Ds3a anode, current-limiting resistance R3a one end and clamp capacitor Cs3a is connected, the node of current-limiting inductance L3a one end and the current-limiting resistance R3a other end is connected in negative busbar, and the node of the current-limiting inductance L3a other end and current limliting diode Ds3a negative electrode is connected in the negative busbar of three-level inverter one (11) input;
Three level DC unit two (16) comprising: the node of the node of voltage transformer VT2b and VT3b and direct current flat wave capacitor Cd2b and Cd3b is connected to the neutral point bus of 12 pulsating wave rectifier two (15) outputs, the other end of VT2b, the Cd2b other end and VT3b, Cd3b is connected in the positive and negative busbar of 12 pulsating wave rectifier two (15) outputs, and current sensor IT2b gathers the positive bus-bar electric current; Discharge switch KF2b and discharge resistance RF2b are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L2b one end and current-limiting resistance R2b one end is connected in positive bus-bar, the node of the current-limiting inductance L1b other end and current limliting diode Ds2b anode is connected in the positive bus-bar of three-level inverter two (17) inputs, and current limliting diode Ds2b negative electrode, the current-limiting resistance R2b other end and clamp capacitor Cs2b one end are connected; The node of clamp capacitor Cs2b and Cs3b is connected in the neutral point bus, the other end of current limliting diode Ds3b anode, current-limiting resistance R3b one end and clamp capacitor Cs3b is connected, the node of current-limiting inductance L3b one end and the current-limiting resistance R3b other end is connected in negative busbar, and the node of the current-limiting inductance L3b other end and current limliting diode Ds3b negative electrode is connected in the negative busbar of three-level inverter two (17) inputs;
Three level DC unit three (22) comprising: the node of the node of voltage transformer VT2c and VT3c and direct current flat wave capacitor Cd2c and Cd3c is connected to the neutral point bus of 12 pulsating wave rectifier three (21) outputs, the other end of VT2c, the Cd2c other end and VT3c, Cd3c is connected in the positive and negative busbar of 12 pulsating wave rectifier three (21) outputs, and current sensor IT2c gathers the positive bus-bar electric current; Discharge switch KF2c and discharge resistance RF2c are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L2c one end and current-limiting resistance R2c one end is connected in positive bus-bar, the node of the current-limiting inductance L1c other end and current limliting diode Ds2c anode is connected in the positive bus-bar of three-level inverter three (23) inputs, and current limliting diode Ds2c negative electrode, the current-limiting resistance R2c other end and clamp capacitor Cs2c one end are connected; The node of clamp capacitor Cs2c and Cs3c is connected in the neutral point bus, the other end of current limliting diode Ds3c anode, current-limiting resistance R3c one end and clamp capacitor Cs3c is connected, the node of current-limiting inductance L3c one end and the current-limiting resistance R3c other end is connected in negative busbar, and the node of the current-limiting inductance L3c other end and current limliting diode Ds3c negative electrode is connected in the negative busbar of three-level inverter three (23) inputs;
Above-mentioned mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT, the output of its six pulse wave rectifiers device one (6) is connected in the input of IGCT two-level inverter one (8) by two level DC unit one (7), the negative electrode of IGCT T1a and the anode of IGCT T2a are connected in the A1 point in the two-level inverter one (8), and the anode of the negative electrode of IGCT T3a and IGCT T4a is connected in the A point; The output of 12 pulsating wave rectifier one (9) is connected in three-level inverter one (11) based on IGCT by three level DC unit one (10), the negative electrode of IGCT T6a and the anode of IGCT T7a are connected in the Na1 point in the three-level inverter one (11), and the anode of the negative electrode of IGCT T10a and IGCT T11a is connected in the Na point; The A1 point of two-level inverter one (8) links to each other with the Na1 point of three-level inverter one (11), is output as A point and Na point;
The output of six pulse wave rectifier devices two (12) is connected in the input of IGCT two-level inverter two (14) by two level DC unit two (13), the negative electrode of IGCT T1b and the anode of IGCT T2b are connected in the B1 point in the two-level inverter two (14), and the anode of the negative electrode of IGCT T3b and IGCT T4b is connected in the B point; The output of 12 pulsating wave rectifier two (15) is connected in three-level inverter two (17) based on IGCT by three level DC unit two (16), the negative electrode of IGCT T6b and the anode of IGCT T7b are connected in the Nb1 point in the inverter two (17), and the anode of the negative electrode of IGCT T10b and IGCT T11b is connected in the Nb point; The B1 point of two-level inverter two (14) links to each other with the Nb1 point of three-level inverter two (17), is output as B point and Nb point;
The output of six pulse wave rectifier devices three (18) is connected in the input of IGCT two-level inverter three (20) by two level DC unit three (19), the negative electrode of IGCT T1c and the anode of IGCT T2c are connected in the C1 point in the two-level inverter three (20), and the anode of the negative electrode of IGCT T3c and IGCT T4c is connected in the C point; The output of 12 pulsating wave rectifier three (21) is connected in three-level inverter three (23) based on IGCT by three level DC unit three (22), the negative electrode of IGCT T6c and the anode of IGCT T7c are connected in the Nc1 point in the three-level inverter three (23), and the anode of the negative electrode of IGCT T10c and IGCT T11c is connected in the Nc point; The C1 point of two-level inverter three (20) links to each other with the Nc1 point of three-level inverter three (23), is output as C point and Nc point;
Na, Nb, the Nc point of inversion unit (4) output are connected in the N point, the A point is connected with the end of the filter inductance La of output filter, the B point is connected with the end of the filter inductance Lb of output filter, and the C point is connected with the end of the filter inductance Lc of output filter.
Above-mentioned mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT, inductance L a, a Lb in the described dv/dt filter (5) and the end of Lc link to each other with inversion unit output, the other end of inductance respectively with dv/dt filter (5) in capacitor C a, Cb and the end of Cc be connected, be connected in the input of motor simultaneously, the other end of electric capacity is connected to resistance R a, Rb and Rc, and the other end of resistance links together and ground connection.
Therefore, the utlity model has following advantage: 1. the structure that adopts many windings phase shifting transformer and six groups of mutual independent rectifiers, can reduce high voltage converter Harmonic Interference to electrical network in the work engineering, guarantee that the total percent harmonic distortion THD of input current is less than 5%; 2. in order to overcome the restriction that is subjected to the IGCT voltage withstand class, adopt the structure of two level H-bridge inverters and three level H-bridge inversions series connection, obtained the high-voltage large-capacity output of 10kV; 3. the voltage of frequency converter output has characteristics such as harmonic content is low, level number is many, electric pressure height; 4. the dv/dt Filter Design has reduced the dv/dt that high voltage converter is exported, and has protected the insulation of load motor.
Description of drawings
Fig. 1 is a frequency converter entire block diagram of the present utility model;
Fig. 2 is many windings rectifier transformer schematic diagram;
Fig. 3 is the rectification unit topology diagram;
Fig. 4 is a direct current unit topology diagram;
Fig. 5 is inversion unit and output dv/dt filter topology figure.
Corresponding figure number and name are called among the figure: multi winding transformer 1, rectification unit 2, direct current unit 3, inversion unit 4, dv/dt filter 5, six pulse wave rectifier devices 1, two level DC unit 1, two level H-bridge inverters 1,12 pulsating wave rectifier 1, three level DC unit 1, three level H-bridge inverters 1, six pulse wave rectifier devices 2 12, two level DC unit 2 13, two level H-bridge inverters 2 14,12 pulsating wave rectifier 2 15, three level DC unit 2 16, three level H-bridge inverters 2 17, six pulse wave rectifier devices 3 18, two level DC unit 3 19, two level H-bridge inverters 3 20,12 pulsating wave rectifier 3 21, three level DC unit 3 22, three level H-bridge inverters 3 23.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.Each Reference numeral name is called among the figure:
Embodiment:
A kind of mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT comprises
Many windings rectifier transformer (1): the three-phase voltage that the high pressure three-phase alternating current of electrical network is changed into 9 groups of phase shifts 6.67; And the grid side current harmonics effectively suppressed, make the line current aberration rate of input side satisfy the requirement of IEEE519-1992 standard; Rectification unit (2): the secondary alternating voltage of many windings rectifier transformer (1) is become six groups of independently pulsating dc voltages, and this secondary alternating voltage is the three-phase voltage of above-mentioned 9 groups of phase shifts 6.67; Direct current unit (3): the pulsating dc voltage after rectification unit (2) rectification is become galvanic current press, suppress the current changing rate of direct current unit output simultaneously; Inversion unit (4): the three-phase high-voltage that the stable DC electricity of direct current unit (3) output is become the frequency adjustable joint; Dv/dt filter (5): the dv/dt of inversion unit (4) output is suppressed, to satisfy of the requirement of load high-tension motor to frequency converter output dv/dt; As shown in Figure 1, rectification unit (2), direct current unit (3), inversion unit (4) and dv/dt filter (5).The 10kV/50Hz high pressure three-phase alternating current of electrical network is the voltage of 2020V through the regulation voltage that multi winding transformer becomes 9 groups of three-phases, become galvanic current through rectification unit, direct current unit again, by inversion unit direct current is become the 10kV high pressure of frequency adjustable joint again, after export to the load high-tension motor after the dv/dt filtering
Wherein, the secondary of many windings rectifier transformer (1) is connected in the input of rectification unit (2), the output of rectification unit (2) is connected in the input of direct current unit (3), direct current unit (3) output is connected in inversion unit (4), and the output of inversion unit (4) is connected in dv/dt filter (5).
As shown in Figure 2, many windings rectifier transformer (1) comprises that former limit is winding a1b1c1, a2b2c2, a3b3c3, a4b4c4, a5b5c5, a6b6c6, a7b7c7, a8b8c8 and the a9b9c9 that lengthened triangular is connected for the three phase winding UVW that the Y type connects with secondary, the phase place of output voltage relative reference voltage is followed successively by-26.67 ,-20 ,-13.33 ,-6.67,0 ,+6.67 ,+13.33 ,+20 ,+26.67, described former limit input voltage 10kV, described secondary output voltage is 2020V.
Rectification unit (2) comprises three group of six pulse wave rectifier device and three groups of 12 pulsating wave rectifiers, i.e. six pulse wave rectifier devices, one (6), six pulse wave rectifier devices, two (12), six pulse wave rectifier devices three (18), 12 pulsating wave rectifier one (9), 12 pulsating wave rectifier two (15) and 12 pulsating wave rectifier three (21), above-mentioned many windings rectifier transformer (1) secondary a1b1c1 is connected to the input of six pulse wave rectifier devices one (6); Secondary a2b2c2, a3b3c3 are connected to last six pulse wave rectifier devices input and the six pulse wave rectifier devices input down in the 12 pulsating wave rectifier one (9) mutually; Secondary a4b4c4 is connected to the input of six pulse wave rectifier devices two (12); Secondary a5b5c5, a6b6c6 are connected to last six pulse wave rectifier devices input and the six pulse wave rectifier devices input down in the 12 pulsating wave rectifier two (15) mutually; Secondary a7b7c7 is connected to the input of six pulse wave rectifier devices three (18); Secondary a8b8c8, a9b9c9 are connected to last six pulse wave rectifier devices input and the six pulse wave rectifier devices input down in the 12 pulsating wave rectifier three (21) mutually.As shown in Figure 3, rectification unit 2 comprises six pulse wave rectifier devices 1, six pulse wave rectifier devices 2 12 and six pulse wave rectifier devices 3 18,12 pulsating wave rectifier 1,12 pulsating wave rectifier 2 15 and 12 pulsating wave rectifier 3 21 directly are not electrically connected between each rectifier is mutual.Six pulse wave rectifier devices 1 are made of power diode D1a, D2a, D3a, D4a, D5a and D6a, six pulse wave rectifier devices 212 are made of power diode D1b, D2b, D3b, D4b, D5b and D6b, and six pulse wave rectifier devices 3 18 are made of power diode D1c, D2c, D3c, D4c, D5c and D6c; 12 pulsating wave rectifier 1 is made of power diode D7a, D8a, D9a, D10a, D11a, D12a, D13a, D14a, D15a, D16a, D17a and D18a, 12 pulsating wave rectifier 2 15 is made of power diode D7b, D8b, D9b, D10b, D11b, D12b, D13b, D14b, D15b, D16b, D17b and D18b, and 12 pulsating wave rectifier 3 21 is made of power diode D7c, D8c, D9c, D10c, D11c, D12c, D13c, D14c, D15c, D16c, D17c and D18c.Six pulse wave rectifier device output voltages are 2.3kV ~ 3kV, and 12 pulsating wave rectifier output voltage is 4.6kV ~ 6kV.
The input of six pulse wave rectifier devices 6 one is connected in transformer secondary winding a1b1c1, and output is connected in the input of two level DC unit 1; The input of six pulse wave rectifier devices 2 12 is connected in transformer secondary winding a4b4c4, and output is connected in the input of two level DC unit 2 13; The input of six pulse wave rectifier devices 3 18 is connected in transformer secondary winding a7b7c7, and output is connected in the input of two level DC unit 3 19.
The input of 12 pulsating wave rectifier 1 is connected in transformer secondary winding a2b2c2 and a3b3c3, and output is connected in the input of three level DC unit 1; The input of 12 pulsating wave rectifier 2 15 is connected in transformer secondary winding a5b5c5 and a6b6c6, and output is connected in the input of three level DC unit 2 16; The input of 12 pulsating wave rectifier 3 21 is connected in transformer secondary winding a8b8c8 and a9b9c9, and output is connected in the input of three level DC unit 3 22.
Direct current unit (3) comprises one (7), two level DC unit two (13), two level DC unit and two level DC unit three (19), three level DC unit one (10), three level DC unit two (16) and three level DC unit three (22).As shown in Figure 4, direct current unit 3 comprises two level DC unit 1, two level DC unit 2 13 and two level DC unit 3 19, three level DC unit 1, three level DC unit 2 16 and three level DC unit 3 22 directly are not electrically connected between each unit is mutual.Two level DC unit 1 are made of voltage transformer VT1a, current sensor IT1a, direct current flat wave capacitor Cd1a, discharge switch KF1a, discharge resistance RF1a, current-limiting inductance L1a, current-limiting resistance R1a, current limliting diode Ds1a and clamp capacitor Cs1a; Two level DC unit 2 13 are made of voltage transformer VT1b, current sensor IT1b, direct current flat wave capacitor Cd1b, discharge switch KF1b, discharge resistance RF1b, current-limiting inductance L1b, current-limiting resistance R1b, current limliting diode Ds1b and clamp capacitor Cs1b; Two level DC unit 3 19 are made of voltage transformer VT1c, current sensor IT1c, direct current flat wave capacitor Cd1c, discharge switch KF1c, discharge resistance RF1c, current-limiting inductance L1c, current-limiting resistance R1c, current limliting diode Ds1c and clamp capacitor Cs1c; Three level DC unit 1 is made of voltage transformer VT2a and VT3a, current sensor IT2a, direct current flat wave capacitor Cd2a and Cd3a, discharge switch KF2a, discharge resistance RF2a, current-limiting inductance L2a and L3a, current-limiting resistance R2a and R3a, current limliting diode Ds2a and Ds3a, clamp capacitor Cs2a and Cs3a; Three level DC unit 2 16 is made of voltage transformer VT2b and VT3b, current sensor IT2b, direct current flat wave capacitor Cd2b and Cd3b, discharge switch KF2b, discharge resistance RF2b, current-limiting inductance L2b and L3b, current-limiting resistance R2b and R3b, current limliting diode Ds2b and Ds3b, clamp capacitor Cs2b and Cs3b; Three level DC unit 3 22 is made of voltage transformer VT2c and VT3c, current sensor IT2c, direct current flat wave capacitor Cd2c and Cd3c, discharge switch KF2c, discharge resistance RF2c, current-limiting inductance L2c and L3c, current-limiting resistance R2c and R3c, current limliting diode Ds2c and Ds3c, clamp capacitor Cs2c and Cs3c.
The voltage transformer in the control system collection direct current unit and the data of current sensor prevent dc bus over-voltage and over-current or under-voltage; The voltage harmonic of direct current flat wave capacitor filtering rectifier output is guaranteed dc voltage stability; The effect of discharge switch and resistance is a frequency converter when maintenance, guarantees that dc capacitor does not have voltage; The effect of current limliting link is to reduce di/dt and overvoltage in the IGCT switching process, protection IGCT device.
The input of two level DC unit 1, two level DC unit 2 13, two level DC unit 3 19 is connected to the output of six pulse wave rectifier devices 1, six pulse wave rectifier devices 2 12, six pulse wave rectifier devices 3 18, and the input of three level DC unit 1, three level DC unit 2 16, three level DC unit 3 22 is connected to the output of 12 pulsating wave rectifier 1,12 pulsating wave rectifier 2 15,12 pulsating wave rectifier 3 21; The output of two level DC unit 1, two level DC unit 2 13, two level DC unit 3 19 is connected to the input of two level H-bridge inverters 1, two level H-bridge inverters 2 14, two level H-bridge inverters 3 20, and the output of three level DC unit 1, three level DC unit 2 16, three level DC unit 3 22 is connected to the input of three level H-bridge inverters 1, three level H-bridge inverters 2 17, three level H-bridge inverters 3 23;
One (7), two level DC unit two (13), two level DC unit and two level DC unit three (19) comprise respectively:
Two level DC unit one (7) comprising: voltage transformer VT1a and direct current flat wave capacitor Cd1a two ends are connected to the positive and negative busbar of six pulse wave rectifier devices, one (6) output, and current sensor IT1a gathers the positive bus-bar electric current; Discharge switch KF1a and discharge resistance RF1a are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L1a one end and current-limiting resistance R1a one end is connected in positive bus-bar, the node of the current-limiting inductance L1a other end and current limliting diode Ds1a anode is connected in the positive bus-bar of two-level inverter one (8) input, current limliting diode Ds1a negative electrode, the current-limiting resistance R1a other end and clamp capacitor Cs1a one end are connected, and the clamp capacitor Cs1a other end is connected in negative busbar and is connected in the negative busbar of two-level inverter one (8) input;
Two level DC unit two (13) comprising: voltage transformer VT1b and direct current flat wave capacitor Cd1b two ends are connected to the positive and negative busbar of six pulse wave rectifier devices, two (12) outputs, and current sensor IT1b gathers the positive bus-bar electric current; Discharge switch KF1b and discharge resistance RF1b are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L1b one end and current-limiting resistance R1b one end is connected in positive bus-bar, the node of the current-limiting inductance L1b other end and current limliting diode Ds1b anode is connected in the positive bus-bar of two-level inverter two (14) inputs, current limliting diode Ds1b negative electrode, the current-limiting resistance R1b other end and clamp capacitor Cs1b one end are connected, and the clamp capacitor Cs1b other end is connected in negative busbar and is connected in the negative busbar of two-level inverter two (14) inputs;
Two level DC unit three (19) comprising: voltage transformer VT1c and direct current flat wave capacitor Cd1c two ends are connected to the positive and negative busbar of six pulse wave rectifier devices, three (18) outputs, and current sensor IT1c gathers the positive bus-bar electric current; Discharge switch KF1c and discharge resistance RF1c are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L1c one end and current-limiting resistance R1c one end is connected in positive bus-bar, the node of the current-limiting inductance L1c other end and current limliting diode Ds1c anode is connected in the positive bus-bar of two-level inverter three (20) inputs, current limliting diode Ds1c negative electrode, the current-limiting resistance R1c other end and clamp capacitor Cs1c one end are connected, and the clamp capacitor Cs1c other end is connected in negative busbar and is connected in the negative busbar of two-level inverter three (20) inputs.
Three level DC unit one (10), three level DC unit two (16) and three level DC unit three (22) comprise respectively:
Three level DC unit one (10) comprising: the node of the node of voltage transformer VT2a and VT3a and direct current flat wave capacitor Cd2a and Cd3a is connected to the neutral point bus of 12 pulsating wave rectifier one (9) output, the other end of VT2a, the Cd2a other end and VT3a, Cd3a is connected in the positive and negative busbar of 12 pulsating wave rectifier one (9) output, and current sensor IT2a gathers the positive bus-bar electric current; Discharge switch KF2a and discharge resistance RF2a are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L2a one end and current-limiting resistance R2a one end is connected in positive bus-bar, the node of the current-limiting inductance L1a other end and current limliting diode Ds2a anode is connected in the positive bus-bar of three-level inverter one (11) input, and current limliting diode Ds2a negative electrode, the current-limiting resistance R2a other end and clamp capacitor Cs2a one end are connected; The node of clamp capacitor Cs2a and Cs3a is connected in the neutral point bus, the other end of current limliting diode Ds3a anode, current-limiting resistance R3a one end and clamp capacitor Cs3a is connected, the node of current-limiting inductance L3a one end and the current-limiting resistance R3a other end is connected in negative busbar, and the node of the current-limiting inductance L3a other end and current limliting diode Ds3a negative electrode is connected in the negative busbar of three-level inverter one (11) input;
Three level DC unit two (16) comprising: the node of the node of voltage transformer VT2b and VT3b and direct current flat wave capacitor Cd2b and Cd3b is connected to the neutral point bus of 12 pulsating wave rectifier two (15) outputs, the other end of VT2b, the Cd2b other end and VT3b, Cd3b is connected in the positive and negative busbar of 12 pulsating wave rectifier two (15) outputs, and current sensor IT2b gathers the positive bus-bar electric current; Discharge switch KF2b and discharge resistance RF2b are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L2b one end and current-limiting resistance R2b one end is connected in positive bus-bar, the node of the current-limiting inductance L1b other end and current limliting diode Ds2b anode is connected in the positive bus-bar of three-level inverter two (17) inputs, and current limliting diode Ds2b negative electrode, the current-limiting resistance R2b other end and clamp capacitor Cs2b one end are connected; The node of clamp capacitor Cs2b and Cs3b is connected in the neutral point bus, the other end of current limliting diode Ds3b anode, current-limiting resistance R3b one end and clamp capacitor Cs3b is connected, the node of current-limiting inductance L3b one end and the current-limiting resistance R3b other end is connected in negative busbar, and the node of the current-limiting inductance L3b other end and current limliting diode Ds3b negative electrode is connected in the negative busbar of three-level inverter two (17) inputs;
Three level DC unit three (22) comprising: the node of the node of voltage transformer VT2c and VT3c and direct current flat wave capacitor Cd2c and Cd3c is connected to the neutral point bus of 12 pulsating wave rectifier three (21) outputs, the other end of VT2c, the Cd2c other end and VT3c, Cd3c is connected in the positive and negative busbar of 12 pulsating wave rectifier three (21) outputs, and current sensor IT2c gathers the positive bus-bar electric current; Discharge switch KF2c and discharge resistance RF2c are composed in series discharge paths and are connected in positive and negative dc bus; The node of current-limiting inductance L2c one end and current-limiting resistance R2c one end is connected in positive bus-bar, the node of the current-limiting inductance L1c other end and current limliting diode Ds2c anode is connected in the positive bus-bar of three-level inverter three (23) inputs, and current limliting diode Ds2c negative electrode, the current-limiting resistance R2c other end and clamp capacitor Cs2c one end are connected; The node of clamp capacitor Cs2c and Cs3c is connected in the neutral point bus, the other end of current limliting diode Ds3c anode, current-limiting resistance R3c one end and clamp capacitor Cs3c is connected, the node of current-limiting inductance L3c one end and the current-limiting resistance R3c other end is connected in negative busbar, and the node of the current-limiting inductance L3c other end and current limliting diode Ds3c negative electrode is connected in the negative busbar of three-level inverter three (23) inputs;
The output of six pulse wave rectifier devices one (6) is connected in the input of IGCT two-level inverter one (8) by two level DC unit one (7), the negative electrode of IGCT T1a and the anode of IGCT T2a are connected in the A1 point in the two-level inverter one (8), and the anode of the negative electrode of IGCT T3a and IGCT T4a is connected in the A point; The output of 12 pulsating wave rectifier one (9) is connected in three-level inverter one (11) based on IGCT by three level DC unit one (10), the negative electrode of IGCT T6a and the anode of IGCT T7a are connected in the Na1 point in the three-level inverter one (11), and the anode of the negative electrode of IGCT T10a and IGCT T11a is connected in the Na point; The A1 point of two-level inverter one (8) links to each other with the Na1 point of three-level inverter one (11), is output as A point and Na point;
The output of six pulse wave rectifier devices two (12) is connected in the input of IGCT two-level inverter two (14) by two level DC unit two (13), the negative electrode of IGCT T1b and the anode of IGCT T2b are connected in the B1 point in the two-level inverter two (14), and the anode of the negative electrode of IGCT T3b and IGCT T4b is connected in the B point; The output of 12 pulsating wave rectifier two (15) is connected in three-level inverter two (17) based on IGCT by three level DC unit two (16), the negative electrode of IGCT T6b and the anode of IGCT T7b are connected in the Nb1 point in the inverter two (17), and the anode of the negative electrode of IGCT T10b and IGCT T11b is connected in the Nb point; The B1 point of two-level inverter two (14) links to each other with the Nb1 point of three-level inverter two (17), is output as B point and Nb point;
The output of six pulse wave rectifier devices three (18) is connected in the input of IGCT two-level inverter three (20) by two level DC unit three (19), the negative electrode of IGCT T1c and the anode of IGCT T2c are connected in the C1 point in the two-level inverter three (20), and the anode of the negative electrode of IGCT T3c and IGCT T4c is connected in the C point; The output of 12 pulsating wave rectifier three (21) is connected in three-level inverter three (23) based on IGCT by three level DC unit three (22), the negative electrode of IGCT T6c and the anode of IGCT T7c are connected in the Nc1 point in the three-level inverter three (23), and the anode of the negative electrode of IGCT T10c and IGCT T11c is connected in the Nc point; The C1 point of two-level inverter three (20) links to each other with the Nc1 point of three-level inverter three (23), is output as C point and Nc point;
Na, Nb, the Nc point of inversion unit (4) output are connected in the N point, the A point is connected with the end of the filter inductance La of output filter, the B point is connected with the end of the filter inductance Lb of output filter, and the C point is connected with the end of the filter inductance Lc of output filter.
Inductance L a, a Lb in the dv/dt filter (5) and the end of Lc link to each other with inversion unit output, the other end of inductance respectively with dv/dt filter (5) in capacitor C a, Cb and the end of Cc be connected, be connected in the input of motor simultaneously, the other end of electric capacity is connected to resistance R a, Rb and Rc, and the other end of resistance links together and ground connection.
As shown in Figure 5, inversion unit is output as the ABC three-phase, and A is made of two level H-bridge inverters 1 and three level H-bridge inverters 1, and this has exported A point and Na point two points mutually; B is made of two level H-bridge inverters 2 14 and three level H-bridge inverters 2 17, and this has exported B point and Nb point two points mutually; C is made of two level H-bridge inverters 3 20 and three level H-bridge inverters 3 23, and this has exported C point and Nc point two points mutually; Na, Nb, 3 of Nc are connected in the N node, and A, B, 3 of C are the output point of inversion unit, are connected in the input of dv/dt filter.
Inversion unit A phase: IGCT T1a and T2a are composed in series a brachium pontis of two level H-bridge inverters, and IGCT T3a and T4a are composed in series another brachium pontis of two level H-bridge inverters, two brachium pontis formation in parallel two level H-bridge inverters 1; IGCT T5a, T6a, T7a and T8a are connected into a branch road, by power diode DT1a, the branch road of DT2a series connection is attempted by IGCT T5a, the node of T6a and IGCT T7a, between the node of T8a, a brachium pontis forming three level H-bridge inverters, IGCT T9a, T10a, T11a and T12a are connected into a branch road, by power diode DT3a, the branch road of DT4a series connection is attempted by IGCT T9a, the node of T10a and IGCT T11a, between the node of T12a, another brachium pontis of forming three level H-bridge inverters, power diode DT1a, the node of DT2a and DT3a, the node of DT4a links to each other and constitutes the mid point of three level input, two brachium pontis formation in parallel three level H-bridge inverters 11; The node of IGCT T1a, T2a is connected with the node of IGCT T6a, T7a, and the node of IGCT T10a and T11a is the Na point, and the node of IGCT T3a, T4a is the end that the A point is connected in inductance L a;
Inversion unit B phase: IGCT T1b and T2b are composed in series a brachium pontis of two level H-bridge inverters, and IGCT T3b and T4b are composed in series another brachium pontis of two level H-bridge inverters, two brachium pontis formation in parallel two level H-bridge inverters 2 14; IGCT T5b, T6b, T7b and T8b are connected into a branch road, by power diode DT1b, the branch road of DT2b series connection is attempted by IGCT T5b, the node of T6b and IGCT T7b, between the node of T8b, a brachium pontis forming three level H-bridge inverters, IGCT T9b, T10b, T11b and T12b are connected into a branch road, by power diode DT3b, the branch road of DT4b series connection is attempted by IGCT T9b, the node of T10b and IGCT T11b, between the node of T12b, another brachium pontis of forming three level H-bridge inverters, power diode DT1b, the node of DT2b and DT3b, the node of DT4b links to each other and constitutes the mid point of three level input, two brachium pontis formation in parallel three level H-bridge inverters 17; The node of IGCT T1b, T2b is connected with the node of IGCT T6b, T7b, and the node of IGCT T10b and T11b is the Nb point, and the node of IGCT T3b, T4b is the end that the B point is connected in inductance L b;
Inversion unit C phase: IGCT T1c and T2c are composed in series a brachium pontis of two level H-bridge inverters, and IGCT T3c and T4c are composed in series another brachium pontis of two level H-bridge inverters, two brachium pontis formation in parallel two level H-bridge inverters 20; IGCT T5c, T6c, T7c and T8c are connected into a branch road, by power diode DT1c, the branch road of DT2c series connection is attempted by IGCT T5c, the node of T6c and IGCT T7c, between the node of T8c, a brachium pontis forming three level H-bridge inverters, IGCT T9c, T10c, T11c and T12c are connected into a branch road, by power diode DT3c, the branch road of DT4c series connection is attempted by IGCT T9c, the node of T10c and IGCT T11c, between the node of T12c, another brachium pontis of forming three level H-bridge inverters, power diode DT1c, the node of DT2c and DT3c, the node of DT4c links to each other and constitutes the mid point of three level input, two brachium pontis formation in parallel three level H-bridge inverters; The node of IGCT T1c, T2c is connected with the node of IGCT T6c, T7c, and the node of IGCT T10c and T11c is the Nc point, and the node of IGCT T3c, T4c is the end that the C point is connected in inductance L c.
The end of the inductance L a of dv/dt filter, Lb and Lc links to each other with A, B, the C point of the ABC three-phase of inversion unit output, the other end of inductance is connected with the end of capacitor C a, Cb and Cc respectively, be connected in the input of load motor simultaneously, the other end of electric capacity is connected to resistance R a, Rb and Rc, and the other end of resistance links together and is connected in ground.Test shows that this filter can obviously reduce the dv/dt of high voltage converter output, has effectively protected insulation of Electric Motor.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although this paper has used multi winding transformer 1 morely, rectification unit 2, direct current unit 3, inversion unit 4, dv/dt filter 5, six pulse wave rectifier devices 1, two level DC unit 1, two level H-bridge inverters 1,12 pulsating wave rectifier 1, three level DC unit 1, three level H-bridge inverters 1, six pulse wave rectifier devices 2 12, two level DC unit 2 13, two level H-bridge inverters 2 14,12 pulsating wave rectifier 2 15, three level DC unit 2 16, three level H-bridge inverters 2 17, six pulse wave rectifier devices 3 18, two level DC unit 3 19, two level H-bridge inverters 3 20,12 pulsating wave rectifier 3 21, three level DC unit 3 22, three level H-bridge inverters, 3 23 terms such as grade, but do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present utility model more easily; They are construed to any additional restriction all is contrary with the utility model spirit.
Claims (8)
1. the mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT is characterized in that: comprising: many windings rectifier transformer (1), rectification unit (2), direct current unit (3), inversion unit (4), dv/dt filter (5); Wherein, the secondary of many windings rectifier transformer (1) is connected in the input of rectification unit (2), the output of rectification unit (2) is connected in the input of direct current unit (3), direct current unit (3) output is connected in inversion unit (4), and the output of inversion unit (4) is connected in dv/dt filter (5).
2. the mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT according to claim 1 is characterized in that, described many windings rectifier transformer (1) comprises that former limit is the winding a that lengthened triangular is connected for the three phase winding UVW that the Y type connects with secondary
1b
1c
1, a
2b
2c
2, a
3b
3c
3, a
4b
4c
4, a
5b
5c
5, a
6b
6c
6, a
7b
7c
7, a
8b
8c
8And a
9b
9c
9, the phase place of output voltage relative reference voltage is followed successively by-26.67 ,-20 ,-13.33 ,-6.67,0 ,+6.67 ,+13.33 ,+20 ,+26.67, described former limit input voltage 10kV, described secondary output voltage is 2020V.
3. the mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT according to claim 2, it is characterized in that, described rectification unit (2) comprises three group of six pulse wave rectifier device and three groups of 12 pulsating wave rectifiers, i.e. six pulse wave rectifier devices, one (6), six pulse wave rectifier devices, two (12), six pulse wave rectifier devices three (18), 12 pulsating wave rectifier one (9), 12 pulsating wave rectifier two (15) and 12 pulsating wave rectifier three (21), above-mentioned many windings rectifier transformer (1) secondary a
1b
1c
1Be connected to the input of six pulse wave rectifier devices one (6); Secondary a
2b
2c
2, a
3b
3c
3Be connected to last six pulse wave rectifier devices input and six pulse wave rectifier devices input down in the 12 pulsating wave rectifier one (9) mutually; Secondary a
4b
4c
4Be connected to the input of six pulse wave rectifier devices two (12); Secondary a
5b
5c
5, a
6b
6c
6Be connected to last six pulse wave rectifier devices input and six pulse wave rectifier devices input down in the 12 pulsating wave rectifier two (15) mutually; Secondary a
7b
7c
7Be connected to the input of six pulse wave rectifier devices three (18); Secondary a
8b
8c
8, a
9b
9c
9Be connected to last six pulse wave rectifier devices input and six pulse wave rectifier devices input down in the 12 pulsating wave rectifier three (21) mutually.
4. the mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT according to claim 1, it is characterized in that, described direct current unit (3) comprises one (7), two level DC unit two (13), two level DC unit and two level DC unit three (19), three level DC unit one (10), three level DC unit two (16) and three level DC unit three (22).
5. the mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT according to claim 4 is characterized in that, described one (7), two level DC unit two (13), two level DC unit and two level DC unit three (19) comprise respectively:
Two level DC unit one (7) comprising: voltage transformer V
T1aWith direct current flat wave capacitor C
D1aTwo ends are connected to the positive and negative busbar of six pulse wave rectifier devices, one (6) output, current sensor I
T1aGather the positive bus-bar electric current; Discharge switch K
F1aWith discharge resistance R
F1aBe composed in series discharge paths and be connected in positive and negative dc bus; Current-limiting inductance L
1aOne end and current-limiting resistance R
1aThe node of one end is connected in positive bus-bar, current-limiting inductance L
1aThe other end and current limliting diode D
S1aThe node of anode is connected in the positive bus-bar of two-level inverter one (8) input, current limliting diode D
S1aNegative electrode, current-limiting resistance R
1aThe other end and clamp capacitor C
S1aOne end connects, clamp capacitor C
S1aThe other end is connected in negative busbar and is connected in the negative busbar of two-level inverter one (8) input;
Two level DC unit two (13) comprising: voltage transformer V
T1bWith direct current flat wave capacitor C
D1bTwo ends are connected to the positive and negative busbar of six pulse wave rectifier devices, two (12) outputs, current sensor I
T1bGather the positive bus-bar electric current; Discharge switch K
F1bWith discharge resistance R
F1bBe composed in series discharge paths and be connected in positive and negative dc bus; Current-limiting inductance L
1bOne end and current-limiting resistance R
1bThe node of one end is connected in positive bus-bar, current-limiting inductance L
1bThe other end and current limliting diode D
S1bThe node of anode is connected in the positive bus-bar of two-level inverter two (14) inputs, current limliting diode D
S1bNegative electrode, current-limiting resistance R
1bThe other end and clamp capacitor C
S1bOne end connects, clamp capacitor C
S1bThe other end is connected in negative busbar and is connected in the negative busbar of two-level inverter two (14) inputs;
Two level DC unit three (19) comprising: voltage transformer V
T1cWith direct current flat wave capacitor C
D1cTwo ends are connected to the positive and negative busbar of six pulse wave rectifier devices, three (18) outputs, current sensor I
T1cGather the positive bus-bar electric current; Discharge switch K
F1cWith discharge resistance R
F1cBe composed in series discharge paths and be connected in positive and negative dc bus; Current-limiting inductance L
1cOne end and current-limiting resistance R
1cThe node of one end is connected in positive bus-bar, current-limiting inductance L
1cThe other end and current limliting diode D
S1cThe node of anode is connected in the positive bus-bar of two-level inverter three (20) inputs, current limliting diode D
S1cNegative electrode, current-limiting resistance R
1cThe other end and clamp capacitor C
S1cOne end connects, clamp capacitor C
S1cThe other end is connected in negative busbar and is connected in the negative busbar of two-level inverter three (20) inputs.
6. the mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT according to claim 4 is characterized in that, described three level DC unit one (10), three level DC unit two (16) and three level DC unit three (22) comprise respectively:
Three level DC unit one (10) comprising: voltage transformer V
T2aAnd V
T3aNode and direct current flat wave capacitor C
D2aAnd C
D3aNode be connected to the neutral point bus of 12 pulsating wave rectifier one (9) output, V
T2a, C
D2aThe other end and V
T3a, C
D3aThe other end be connected in the positive and negative busbar of 12 pulsating wave rectifier one (9) output, current sensor I
T2aGather the positive bus-bar electric current; Discharge switch K
F2aWith discharge resistance R
F2aBe composed in series discharge paths and be connected in positive and negative dc bus; Current-limiting inductance L
2aOne end and current-limiting resistance R
2aThe node of one end is connected in positive bus-bar, current-limiting inductance L
1aThe other end and current limliting diode D
S2aThe node of anode is connected in the positive bus-bar of three-level inverter one (11) input, current limliting diode D
S2aNegative electrode, current-limiting resistance R
2aThe other end and clamp capacitor C
S2aOne end connects; Clamp capacitor C
S2aWith C
S3aNode be connected in the neutral point bus, current limliting diode D
S3aAnode, current-limiting resistance R
3aOne end and clamp capacitor C
S3aThe other end connect current-limiting inductance L
3aOne end and current-limiting resistance R
3aThe node of the other end is connected in negative busbar, current-limiting inductance L
3aThe other end and current limliting diode D
S3aThe node of negative electrode is connected in the negative busbar of three-level inverter one (11) input;
Three level DC unit two (16) comprising: voltage transformer V
T2bAnd V
T3bNode and direct current flat wave capacitor C
D2bAnd C
D3bNode be connected to the neutral point bus of 12 pulsating wave rectifier two (15) output, V
T2b, C
D2bThe other end and V
T3b, C
D3bThe other end be connected in the positive and negative busbar of 12 pulsating wave rectifier two (15) output, current sensor I
T2bGather the positive bus-bar electric current; Discharge switch K
F2bWith discharge resistance R
F2bBe composed in series discharge paths and be connected in positive and negative dc bus; Current-limiting inductance L
2bOne end and current-limiting resistance R
2bThe node of one end is connected in positive bus-bar, current-limiting inductance L
1bThe other end and current limliting diode D
S2bThe node of anode is connected in the positive bus-bar of three-level inverter two (17) inputs, current limliting diode D
S2bNegative electrode, current-limiting resistance R
2bThe other end and clamp capacitor C
S2bOne end connects; Clamp capacitor C
S2bWith C
S3bNode be connected in the neutral point bus, current limliting diode D
S3bAnode, current-limiting resistance R
3bOne end and clamp capacitor C
S3bThe other end connect current-limiting inductance L
3bOne end and current-limiting resistance R
3bThe node of the other end is connected in negative busbar, current-limiting inductance L
3bThe other end and current limliting diode D
S3bThe node of negative electrode is connected in the negative busbar of three-level inverter two (17) inputs;
Three level DC unit three (22) comprising: voltage transformer V
T2cAnd V
T3cNode and direct current flat wave capacitor C
D2cAnd C
D3cNode be connected to the neutral point bus of 12 pulsating wave rectifier three (21) output, V
T2c, C
D2cThe other end and V
T3c, C
D3cThe other end be connected in the positive and negative busbar of 12 pulsating wave rectifier three (21) output, current sensor I
T2cGather the positive bus-bar electric current; Discharge switch K
F2cWith discharge resistance R
F2cBe composed in series discharge paths and be connected in positive and negative dc bus; Current-limiting inductance L
2cOne end and current-limiting resistance R
2cThe node of one end is connected in positive bus-bar, current-limiting inductance L
1cThe other end and current limliting diode D
S2cThe node of anode is connected in the positive bus-bar of three-level inverter three (23) inputs, current limliting diode D
S2cNegative electrode, current-limiting resistance R
2cThe other end and clamp capacitor C
S2cOne end connects; Clamp capacitor C
S2cWith C
S3cNode be connected in the neutral point bus, current limliting diode D
S3cAnode, current-limiting resistance R
3cOne end and clamp capacitor C
S3cThe other end connect current-limiting inductance L
3cOne end and current-limiting resistance R
3cThe node of the other end is connected in negative busbar, current-limiting inductance L
3cThe other end and current limliting diode D
S3cThe node of negative electrode is connected in the negative busbar of three-level inverter three (23) inputs.
7. the mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT according to claim 4 is characterized in that:
The output of six pulse wave rectifier devices one (6) is connected in the input of IGCT two-level inverter one (8) by two level DC unit one (7), IGCT T in the two-level inverter one (8)
1aNegative electrode and IGCT T
2aAnode be connected in A1 point, IGCT T
3aNegative electrode and IGCT T
4aAnode be connected in the A point; The output of 12 pulsating wave rectifier one (9) is connected in three-level inverter one (11) based on IGCT by three level DC unit one (10), IGCT T in the three-level inverter one (11)
6aNegative electrode and IGCT T
7aAnode be connected in Na1 point, IGCT T
10aNegative electrode and IGCT T
11aAnode be connected in the Na point; The A1 point of two-level inverter one (8) links to each other with the Na1 point of three-level inverter one (11), is output as A point and Na point;
The output of six pulse wave rectifier devices two (12) is connected in the input of IGCT two-level inverter two (14) by two level DC unit two (13), IGCT T in the two-level inverter two (14)
1bNegative electrode and IGCT T
2bAnode be connected in B1 point, IGCT T
3bNegative electrode and IGCT T
4bAnode be connected in the B point; The output of 12 pulsating wave rectifier two (15) is connected in three-level inverter two (17) based on IGCT by three level DC unit two (16), IGCT T in the inverter two (17)
6bNegative electrode and IGCT T
7bAnode be connected in Nb1 point, IGCT T
10bNegative electrode and IGCT T
11bAnode be connected in the Nb point; The B1 point of two-level inverter two (14) links to each other with the Nb1 point of three-level inverter two (17), is output as B point and Nb point;
The output of six pulse wave rectifier devices three (18) is connected in the input of IGCT two-level inverter three (20) by two level DC unit three (19), IGCT T in the two-level inverter three (20)
1cNegative electrode and IGCT T
2cAnode be connected in C1 point, IGCT T
3cNegative electrode and IGCT T
4cAnode be connected in the C point; The output of 12 pulsating wave rectifier three (21) is connected in three-level inverter three (23) based on IGCT by three level DC unit three (22), IGCT T in the three-level inverter three (23)
6cNegative electrode and IGCT T
7cAnode be connected in Nc1 point, IGCT T
10cNegative electrode and IGCT T
11cAnode be connected in the Nc point; The C1 point of two-level inverter three (20) links to each other with the Nc1 point of three-level inverter three (23), is output as C point and Nc point;
Na, Nb, the Nc point of inversion unit (4) output are connected in the N point, the A point is connected with the end of the filter inductance La of output filter, the B point is connected with the end of the filter inductance Lb of output filter, and the C point is connected with the end of the filter inductance Lc of output filter.
8. the mixing cascaded H bridge multi-level high-voltage frequency transformer based on IGCT according to claim 1, it is characterized in that, inductance L a, a Lb in the described dv/dt filter (5) and the end of Lc link to each other with inversion unit output, the other end of inductance respectively with dv/dt filter (5) in capacitor C a, Cb and the end of Cc be connected, be connected in the input of motor simultaneously, the other end of electric capacity is connected to resistance R a, Rb and Rc, and the other end of resistance links together and ground connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206233587U CN201878020U (en) | 2010-11-24 | 2010-11-24 | Integrated gate-commutated thyristor (IGCT)-based hybrid series H-bridge multi-level voltage frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206233587U CN201878020U (en) | 2010-11-24 | 2010-11-24 | Integrated gate-commutated thyristor (IGCT)-based hybrid series H-bridge multi-level voltage frequency converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219937A (en) * | 2013-03-07 | 2013-07-24 | 上海交通大学 | Control method of duplex-winding high-power explosion-proof electric machine system based on IGCT five electrical levels |
| CN106385163A (en) * | 2015-07-21 | 2017-02-08 | 特变电工新疆新能源股份有限公司 | Phase power unit based on asymmetric IGCT and H bridge chain link structure |
| WO2018177532A1 (en) * | 2017-03-31 | 2018-10-04 | Abb Schweiz Ag | Filter for high-voltage power converters |
-
2010
- 2010-11-24 CN CN2010206233587U patent/CN201878020U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219937A (en) * | 2013-03-07 | 2013-07-24 | 上海交通大学 | Control method of duplex-winding high-power explosion-proof electric machine system based on IGCT five electrical levels |
| CN103219937B (en) * | 2013-03-07 | 2015-08-12 | 上海交通大学 | Based on the control method of the double winding high-power explosion-proof electric system of IGCT five level |
| CN106385163A (en) * | 2015-07-21 | 2017-02-08 | 特变电工新疆新能源股份有限公司 | Phase power unit based on asymmetric IGCT and H bridge chain link structure |
| WO2018177532A1 (en) * | 2017-03-31 | 2018-10-04 | Abb Schweiz Ag | Filter for high-voltage power converters |
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Effective date of registration: 20151009 Address after: 430064, Wuhan City, Hubei province Hongshan District Lion Hill Street South Lake (steam School Village) Patentee after: Wuhan Changhai electric propulsion and chemical power supply Co., Ltd. Address before: 430064 Hubei City, Hongshan District, lion street, steam school, a village Patentee before: No.712 Inst., China Ship Heavy Industry Group Co. |
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