CN120566919A - Submerged arc furnace variable-frequency power supply system based on mixing of current source and voltage source converter - Google Patents
Submerged arc furnace variable-frequency power supply system based on mixing of current source and voltage source converterInfo
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Abstract
The invention provides an ore-smelting furnace variable-frequency power supply system based on mixing of a current source and a voltage source converter, which comprises 1 multi-winding transformers and n variable-frequency power modules, wherein n is a positive even number, each multi-winding transformer comprises 1 primary winding and n secondary windings, the variable-frequency power modules comprise rectifiers and inverters, and each multi-winding transformer is connected with the n variable-frequency power modules through the n secondary windings. The invention can realize the unit power factor operation at the power grid side, does not need a reactive power compensation device with huge volume and high cost, obviously reduces the cost of the variable-frequency power supply of the submerged arc furnace, does not need a multi-winding phase-shifting transformer, and obviously improves the operation efficiency of the variable-frequency power supply of the submerged arc furnace.
Description
Technical Field
The invention relates to the technical field of submerged arc furnace variable-frequency power supply systems, and particularly provides a submerged arc furnace variable-frequency power supply system based on mixing of a current source and a voltage source converter.
Background
The submerged arc furnace is core equipment for producing industrial raw materials such as industrial silicon, ferroalloy, calcium carbide and the like, and ferroalloy such as silicomanganese, ferrosilicon, high-carbon ferrochrome and the like is an auxiliary material for smelting various steels and is also a basic industrial raw material for supporting social and economic development. The submerged arc furnace is a core device for producing the ferroalloy. The existing high-power submerged arc furnace equipment is generally powered by three single-phase on-load voltage-regulating transformers, the secondary side windings of the three transformers are connected to submerged arc furnace electrodes after being connected in an angular mode, the on-load voltage-regulating transformers are used for regulating power supply voltage, the power supply frequency is 50Hz, large eddy current loss and skin effect exist under the power frequency power supply condition, raw materials such as electrodes and coke are fast in consumption, electric arc instability is low in heating efficiency, and heat loss is high. Taking a silicomanganese furnace with rated capacity of 30MVA as an example, the power consumption of a single year exceeds 2.5 hundred million degrees, and the silicomanganese furnace is typical high-energy-consumption industrial production equipment.
In order to actively respond to the energy-saving carbon reduction call in the national industrial field and solve the problems of high production energy consumption and low heating efficiency of the submerged arc furnace, the scholars and research institutions at home and abroad develop extensive researches and propose to improve the stability and heating efficiency of an electric arc by reducing the power supply frequency of the submerged arc furnace, thereby achieving the purposes of reducing the eddy current loss and the raw material consumption rate of the submerged arc furnace, improving the utilization efficiency of electric energy and reducing the production energy consumption of the submerged arc furnace. Aiming at the problems, the prior art proposes to add a frequency converter between a submerged arc furnace power supply transformer and a short network to change the submerged arc furnace power supply frequency.
Chinese patent CN 217240605U proposes to reduce the submerged arc furnace power supply frequency by using a cycloconverter, but the cycloconverter has a low operating power factor, and requires a bulky and expensive reactive compensation device. Chinese patents CN 109193655A and CN 109672172A propose back-to-back variable frequency power supply schemes in which a front stage employs a diode uncontrolled rectifier bridge and a rear stage employs an active inverter, so that the number of active power semiconductor devices can be reduced, the cost of the variable frequency power supply scheme can be reduced, and the power supply reliability can be improved. However, in order to meet the harmonic content requirement of the power grid side, a multi-winding phase-shifting transformer is needed, and the operation efficiency of the high-transformation ratio phase-shifting transformer is low, so that the overall power supply efficiency of the scheme is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a submerged arc furnace variable-frequency power supply system based on the mixing of a current source and a voltage source converter. The submerged arc furnace variable frequency power supply system based on the mixing of the current source and the voltage source converter can realize unit power factor operation at the power grid side, does not need a reactive power compensation device with huge volume and high cost, obviously reduces the cost of the submerged arc furnace variable frequency power supply, does not need a multi-winding phase-shifting transformer, and obviously improves the operation efficiency of the submerged arc furnace variable frequency power supply.
Aiming at the problems, the invention provides a submerged arc furnace variable frequency power supply system based on the mixture of a current source and a voltage source converter, wherein the submerged arc furnace variable frequency power supply system comprises 1 multi-winding transformer and n variable frequency power modules (n is an even number);
the multi-winding transformer comprises 1 primary winding and n secondary windings;
The frequency conversion power module comprises a rectifier and an inverter,
The multi-winding transformer is connected with n variable frequency power modules through n secondary windings;
wherein, the
The i-th variable frequency power module rectifier comprises an input side filter C f, a first power semiconductor device Ti1, a second power semiconductor device Ti2, a third power semiconductor device Ti3, a fourth power semiconductor device Ti4, a fifth power semiconductor device Ti5, a sixth power semiconductor device Ti6 and a direct current filter inductor L dc;
the i-th variable-frequency power module inverter comprises a direct-current supporting capacitor C, a first power semiconductor device Si1, a second power semiconductor device Si2, a third power semiconductor device Si3, a fourth power semiconductor device Si4 and an output filter inductor L i;
i is a positive integer, and the i is a positive integer, i is more than or equal to 1 and n is more than or equal to n.
Further, the primary winding of the multi-winding transformer is connected to the power grid through a connection terminal A, B, C;
Further, n winding connection terminals are arranged on the secondary side of the multi-winding transformer, wherein the ith winding connection terminal ui, vi and wi are connected with the alternating current side of the ith variable frequency power module rectifier;
The rectifier direct-current side filter inductor L dc of the ith variable-frequency power module is connected with the direct-current support capacitor C of the inverter;
the alternating current sides of all the inverters are connected in parallel through output filter inductors L to form output terminals a and b, and the output terminals a and b are connected to a submerged arc furnace short network to supply power to loads.
Furthermore, the variable-frequency power supply system of the submerged arc furnace further comprises a controller, wherein the controller structurally comprises a main control board card, a control protection board card, a sampling board card, a communication board card, a fault wave recording board and a man-machine interaction system;
the variable-frequency power supply system of the submerged arc furnace takes the zero-crossing point of the jth winding wire voltage U uwj of the secondary side of the multi-winding transformer as a phase starting reference point, and distributes the on-off state of a rectifier of a variable-frequency power module according to a phase-changing angle theta issued by a controller, wherein j is more than or equal to 1 and less than or equal to n/2, and theta is more than or equal to 0 and less than or equal to 180 degrees.
Further, the control process of the on-off state of the rectifier is as follows:
(1) When the phase of the line voltage U uwj is theta-theta+60 degrees, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is conducted, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned on;
(2) When the phase of the line voltage U uwj is theta+60-theta+120 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is conducted, the second power semiconductor device Tj2 is conducted, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned off;
(3) When the phase of the line voltage U uwj is theta+120-theta+180 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned on, the third power semiconductor device Tj3 is turned on, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned off;
(4) When the phase of the line voltage U uwj is theta+180-theta+240 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned on, the fourth power semiconductor device Tj4 is turned on, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned off;
(5) When the phase of the line voltage U uwj is theta+240-theta+300 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned on, the fifth power semiconductor device Tj5 is turned on, and the sixth power semiconductor device Tj6 is turned off;
(6) When the phase of the line voltage U uwj is theta+300-theta+360 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned on, and the sixth power semiconductor device Tj6 is turned on.
Furthermore, the zero crossing point of the kth winding wire voltage U uwk of the secondary side of the multi-winding transformer is used as a phase starting reference point, and the on-off state of the rectifier of the variable frequency power module is distributed according to the phase conversion angle-theta issued by the controller, wherein n/2+1 is not less than k and not more than n.
Further, the control process of the on-off state of the rectifier is as follows:
(1) When the phase of the line voltage U uwk is theta-theta+60 degrees, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is conducted, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned on;
(2) When the phase of the line voltage U uwk is theta+60-theta+120 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is conducted, the second power semiconductor device Tk2 is conducted, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned off;
(3) When the phase of the line voltage U uwk is theta+120-theta+180 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned on, the third power semiconductor device Tk3 is turned on, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned off;
(4) When the phase of the line voltage U uwk is theta+180-theta+240 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned on, the fourth power semiconductor device Tk4 is turned on, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned off;
(5) When the phase of the line voltage U uwk is theta+240-theta+300 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned on, the fifth power semiconductor device Tk5 is turned on, and the sixth power semiconductor device Tk6 is turned off;
(6) When the phase of the line voltage U uwk is theta+300-theta+360 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned on, and the sixth power semiconductor device Tk6 is turned on.
Furthermore, the inverter of the ith variable-frequency power module of the variable-frequency power supply system of the submerged arc furnace generates on-off instructions of the first power semiconductor device Si1, the second power semiconductor device Si2, the third power semiconductor device Si3 and the fourth power semiconductor device Si4 according to the reference voltage and the carrier wave issued by the controller, and adopts a unipolar or bipolar modulation method.
Further, the structures of the first power semiconductor device Ti1, the second power semiconductor device Ti2, the third power semiconductor device Ti3, the fourth power semiconductor device Ti4, the fifth power semiconductor device Ti5 and the sixth power semiconductor device Ti6 comprise 1 NPN transistor and 1 diode, wherein the cathode of the diode is connected to the emitter of the transistor.
Further, the structures of the first power semiconductor device Si1, the second power semiconductor device Si2, the third power semiconductor device Si3 and the fourth power semiconductor device Si4 comprise 1 NPN triode and 1 diode, wherein the anode and the cathode of the diode are respectively connected to the emitter and the collector of the triode.
Compared with the prior art, the submerged arc furnace variable-frequency power supply system based on the mixing of the current source and the voltage source converter has the following outstanding beneficial effects:
The variable-frequency power supply system of the submerged arc furnace based on the mixing of the current source and the voltage source converter can realize the unit power factor operation at the power grid side, does not need a reactive power compensation device with huge volume and high cost, obviously reduces the cost of the variable-frequency power supply of the submerged arc furnace, does not need a multi-winding phase-shifting transformer, and obviously improves the operation efficiency of the variable-frequency power supply of the submerged arc furnace.
Drawings
Fig. 1 is a schematic diagram of a variable frequency power supply topology of an submerged arc furnace based on a mixture of a current source and a voltage source converter.
Detailed Description
The invention will be described in further detail with reference to the drawings and examples.
As shown in fig. 1, the submerged arc furnace variable-frequency power supply system based on the mixing of a current source and a voltage source converter comprises 1 multi-winding transformer and n variable-frequency power modules (n is an even number). Wherein the multi-winding transformer comprises 1 primary winding and n secondary windings, each variable-frequency power module consists of a rectifier and an inverter,
The i (i is a positive integer, i is more than or equal to 1 and n) variable frequency power module rectifier comprises an input side filter C f, a first power semiconductor device Ti1, a second power semiconductor device Ti2, a third power semiconductor device Ti3, a fourth power semiconductor device Ti4, a fifth power semiconductor device Ti5, a sixth power semiconductor device Ti6 and a direct current filter inductor L dc;
wherein the first power semiconductor device Ti1 and the fourth power semiconductor device Ti4 are connected in series; the second power semiconductor device Ti2 is connected in series with the fifth power semiconductor device Ti5, the third power semiconductor device Ti3 is connected in series with the sixth power semiconductor device Ti6, and the power semiconductor devices after being connected in series are connected in parallel;
The i-th variable-frequency power module inverter comprises a direct-current supporting capacitor C, a first power semiconductor device Si1, a second power semiconductor device Si2, a third power semiconductor device Si3, a fourth power semiconductor device Si4 and an output filter inductor L i.
The first power semiconductor device Si1 and the third power semiconductor device Si3 are connected in series, the second power semiconductor device Si2 and the fourth power semiconductor device Si4 are connected in series, and the power semiconductor devices after being connected in series are connected in parallel;
The direct-current side filter inductor L dc of the i-th variable-frequency power module rectifier is connected with the direct-current supporting capacitor C of the variable-frequency power module inverter;
all the alternating current sides of the inverter of the variable frequency power module are connected in parallel through an output filter inductor L to form output terminals a and b, and the output terminals a and b are connected to a submerged arc furnace short network to supply power to a load.
The submerged arc furnace variable-frequency power supply system based on the mixing of the current source and the voltage source converter is characterized in that a power grid is connected with a primary side connecting terminal A, B, C of the multi-winding transformer; the ith winding connecting terminal ui, vi and wi of the secondary side of the multi-winding transformer are connected with the alternating current side of the rectifier of the ith variable frequency power module;
According to the submerged arc furnace variable-frequency power supply system based on the mixing of the current source and the voltage source converter, the j (1-j-n/2) th winding wire voltage U uwj zero crossing point of the secondary side of the multi-winding transformer is taken as a phase starting reference point, the on-off state of a variable-frequency power module rectifier is distributed according to a phase change angle theta (0-180 DEG) issued by a controller, and the specific distribution rule is as follows:
(1) When the phase of the line voltage U uwj is theta-theta+60 degrees, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is conducted, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned on;
(2) When the phase of the line voltage U uwj is theta+60-theta+120 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is conducted, the second power semiconductor device Tj2 is conducted, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned off;
(3) When the phase of the line voltage U uwj is theta+120-theta+180 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned on, the third power semiconductor device Tj3 is turned on, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned off;
(4) When the phase of the line voltage U uwj is theta+180-theta+240 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned on, the fourth power semiconductor device Tj4 is turned on, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned off;
(5) When the phase of the line voltage U uwj is theta+240-theta+300 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned on, the fifth power semiconductor device Tj5 is turned on, and the sixth power semiconductor device Tj6 is turned off;
(6) When the phase of the line voltage U uwj is theta+300-theta+360 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned on, and the sixth power semiconductor device Tj6 is turned on.
According to the submerged arc furnace variable-frequency power supply system based on the mixing of the current source and the voltage source converter, the k (n/2+1 is not less than k is not more than n) th winding wire voltage U uwk zero crossing point of the secondary side of the multi-winding transformer is taken as a phase starting reference point, the on-off state of a variable-frequency power module rectifier is distributed according to a phase change angle-theta issued by a controller, and the distribution rule is as follows:
(1) When the phase of the line voltage U uwk is theta-theta+60 degrees, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is conducted, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned on;
(2) When the phase of the line voltage U uwk is theta+60-theta+120 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is conducted, the second power semiconductor device Tk2 is conducted, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned off;
(3) When the phase of the line voltage U uwk is theta+120-theta+180 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned on, the third power semiconductor device Tk3 is turned on, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned off;
(4) When the phase of the line voltage U uwk is theta+180-theta+240 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned on, the fourth power semiconductor device Tk4 is turned on, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned off;
(5) When the phase of the line voltage U uwk is theta+240-theta+300 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned on, the fifth power semiconductor device Tk5 is turned on, and the sixth power semiconductor device Tk6 is turned off;
(6) When the phase of the line voltage U uwk is theta+300-theta+360 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned on, and the sixth power semiconductor device Tk6 is turned on.
According to the submerged arc furnace variable-frequency power supply system based on the mixing of the current source and the voltage source converter, the ith variable-frequency power module inverter generates on-off instructions of the first power semiconductor device Si1, the second power semiconductor device Si2, the third power semiconductor device Si3 and the fourth power semiconductor device Si4 according to the reference voltage and the carrier wave issued by the controller.
The submerged arc furnace variable-frequency power supply system based on the mixing of the current source and the voltage source converter is arranged, wherein 1 multi-winding transformer is independently arranged in a power distribution room, n variable-frequency power modules (n is an even number) are arranged in 1 or more boxes in a parallel mode to serve as variable-frequency units and are independently arranged in the power distribution room, and a control system is arranged in one or more control cabinets and is independently arranged in the power distribution room or an operation room. The multi-winding transformer is connected to the frequency conversion unit through a cable or a copper bar, the frequency conversion unit is connected to the short network wiring terminal side of the submerged arc furnace through a cable, and the controller is connected with the frequency conversion unit through optical fibers.
The above embodiments are only preferred embodiments of the present invention, and it is intended that the common variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are included in the scope of the present invention.
Claims (10)
1. The submerged arc furnace variable frequency power supply system based on the mixing of the current source and the voltage source converter is characterized by comprising 1 multi-winding transformers and n variable frequency power modules, wherein n is an even number;
the multi-winding transformer comprises 1 primary winding and n secondary windings;
The frequency conversion power module comprises a rectifier and an inverter,
The multi-winding transformer is connected with n variable frequency power modules through n secondary windings;
wherein, the
The i-th variable frequency power module rectifier comprises an input side filter C f, a first power semiconductor device Ti1, a second power semiconductor device Ti2, a third power semiconductor device Ti3, a fourth power semiconductor device Ti4, a fifth power semiconductor device Ti5, a sixth power semiconductor device Ti6 and a direct current filter inductor L dc;
the i-th variable-frequency power module inverter comprises a direct-current supporting capacitor C, a first power semiconductor device Si1, a second power semiconductor device Si2, a third power semiconductor device Si3, a fourth power semiconductor device Si4 and an output filter inductor L i;
i is a positive integer, and the i is a positive integer, i is more than or equal to 1 and n is more than or equal to n.
2. The submerged arc furnace variable frequency power supply system based on the mixture of current sources and voltage source converters of claim 1, wherein the primary windings of the multi-winding transformer are connected to the power grid through connection terminals A, B, C.
3. The submerged arc furnace variable frequency power supply system based on the mixture of the current source and the voltage source converter according to claim 2, wherein,
The secondary side of the multi-winding transformer is provided with n winding connection terminals, wherein the ith winding connection terminals ui, vi and wi are connected with the alternating current side of the rectifier of the ith variable frequency power module;
The rectifier direct-current side filter inductor L dc of the ith variable-frequency power module is connected with the direct-current support capacitor C of the inverter;
the alternating current sides of all the inverters are connected in parallel through output filter inductors L to form output terminals a and b, and the output terminals a and b are connected to a submerged arc furnace short network to supply power to loads.
4. The submerged arc furnace variable frequency power supply system based on the mixture of the current source and the voltage source converter according to claim 3, wherein the submerged arc furnace variable frequency power supply system further comprises a controller, and the controller structure comprises a main control board card, a sampling board card, a communication board card, a fault wave recording board and a human-computer interaction system;
the variable-frequency power supply system of the submerged arc furnace takes the zero-crossing point of the jth winding wire voltage U uwj of the secondary side of the multi-winding transformer as a phase starting reference point, and distributes the on-off state of a rectifier of a variable-frequency power module according to a phase-changing angle theta issued by a controller, wherein j is more than or equal to 1 and less than or equal to n/2, and theta is more than or equal to 0 and less than or equal to 180 degrees.
5. The submerged arc furnace variable frequency power supply system based on the mixture of the current source and the voltage source converter according to claim 4, wherein the control process of the on-off state of the rectifier is as follows:
(1) When the phase of the line voltage U uwj is theta-theta+60 degrees, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is conducted, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned on;
(2) When the phase of the line voltage U uwj is theta+60-theta+120 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is conducted, the second power semiconductor device Tj2 is conducted, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned off;
(3) When the phase of the line voltage U uwj is theta+120-theta+180 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned on, the third power semiconductor device Tj3 is turned on, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned off;
(4) When the phase of the line voltage U uwj is theta+180-theta+240 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned on, the fourth power semiconductor device Tj4 is turned on, the fifth power semiconductor device Tj5 is turned off, and the sixth power semiconductor device Tj6 is turned off;
(5) When the phase of the line voltage U uwj is theta+240-theta+300 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned on, the fifth power semiconductor device Tj5 is turned on, and the sixth power semiconductor device Tj6 is turned off;
(6) When the phase of the line voltage U uwj is theta+300-theta+360 DEG, the first power semiconductor device Tj1 of the j-th variable-frequency power module rectifier is turned off, the second power semiconductor device Tj2 is turned off, the third power semiconductor device Tj3 is turned off, the fourth power semiconductor device Tj4 is turned off, the fifth power semiconductor device Tj5 is turned on, and the sixth power semiconductor device Tj6 is turned on.
6. The submerged arc furnace variable frequency power supply system based on the mixture of the current source and the voltage source converter according to claim 4, wherein the zero crossing point of the kth winding wire voltage U uwk of the secondary side of the multi-winding transformer is used as a phase starting reference point, and the on-off state of the rectifier of the variable frequency power module is distributed according to the phase change angle-theta issued by the controller, wherein n/2+1 is less than or equal to k is less than or equal to n.
7. The submerged arc furnace variable frequency power supply system based on the mixture of the current source and the voltage source converter according to claim 6, wherein the control process of the on-off state of the rectifier is as follows:
(1) When the phase of the line voltage U uwk is theta-theta+60 degrees, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is conducted, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned on;
(2) When the phase of the line voltage U uwk is theta+60-theta+120 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is conducted, the second power semiconductor device Tk2 is conducted, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned off;
(3) When the phase of the line voltage U uwk is theta+120-theta+180 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned on, the third power semiconductor device Tk3 is turned on, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned off;
(4) When the phase of the line voltage U uwk is theta+180-theta+240 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned on, the fourth power semiconductor device Tk4 is turned on, the fifth power semiconductor device Tk5 is turned off, and the sixth power semiconductor device Tk6 is turned off;
(5) When the phase of the line voltage U uwk is theta+240-theta+300 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned on, the fifth power semiconductor device Tk5 is turned on, and the sixth power semiconductor device Tk6 is turned off;
(6) When the phase of the line voltage U uwk is theta+300-theta+360 DEG, the first power semiconductor device Tk1 of the kth variable-frequency power module rectifier is turned off, the second power semiconductor device Tk2 is turned off, the third power semiconductor device Tk3 is turned off, the fourth power semiconductor device Tk4 is turned off, the fifth power semiconductor device Tk5 is turned on, and the sixth power semiconductor device Tk6 is turned on.
8. The submerged arc furnace variable frequency power supply system based on the mixture of the current source and the voltage source converter according to claim 6 or 7, wherein the inverter of the ith variable frequency power module of the submerged arc furnace variable frequency power supply system generates on-off instructions of the first power semiconductor device Si1, the second power semiconductor device Si2, the third power semiconductor device Si3 and the fourth power semiconductor device Si4 according to the reference voltage and the carrier wave issued by the controller.
9. The submerged arc furnace variable frequency power supply system based on the mixture of a current source and a voltage source converter according to claim 1, wherein the structures of the first power semiconductor device Ti1, the second power semiconductor device Ti2, the third power semiconductor device Ti3, the fourth power semiconductor device Ti4, the fifth power semiconductor device Ti5 and the sixth power semiconductor device Ti6 comprise 1 NPN triode and 1 diode, and the cathode of the diode is connected to the emitter of the triode.
10. The submerged arc furnace variable frequency power supply system based on the mixture of the current source and the voltage source converter according to claim 1, wherein the structures of the first power semiconductor device Si1, the second power semiconductor device Si2, the third power semiconductor device Si3 and the fourth power semiconductor device Si4 comprise 1 NPN triode and 1 diode, wherein the anode and the cathode of the diode are respectively connected with an emitter and a collector of the triode.
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