CN114142748A - Main circuit topology and control method of high-power direct-current power supply - Google Patents
Main circuit topology and control method of high-power direct-current power supply Download PDFInfo
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- CN114142748A CN114142748A CN202111389450.0A CN202111389450A CN114142748A CN 114142748 A CN114142748 A CN 114142748A CN 202111389450 A CN202111389450 A CN 202111389450A CN 114142748 A CN114142748 A CN 114142748A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
- H01F27/2828—Construction of conductive connections, of leads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/02—Auto-transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/12—Two-phase, three-phase or polyphase transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/10—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in series, e.g. for multiplication of voltage
Abstract
The invention relates to the technical field of power supplies, in particular to a main circuit topology and a control method of a high-power direct-current power supply, which comprise a first rectification voltage-stabilizing direct-current power supply unit and a second rectification voltage-stabilizing direct-current power supply unit; the first rectification voltage-stabilizing direct-current power supply unit and the second rectification voltage-stabilizing direct-current power supply unit are connected in series or in parallel. Based on the modular design concept, the first rectifying and voltage-stabilizing direct-current power supply unit and the second rectifying and voltage-stabilizing direct-current power supply unit are connected in parallel for operation, and the boosting module in each direct-current unit is connected in parallel for output, so that the redundant operation capacity of the system can be improved; for a large-capacity direct current power supply, when low-voltage large current is required, parallel operation is adopted, and when high-voltage small current is required, a serial operation scheme is adopted, so that the system is convenient to combine.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a main circuit topology and a control method of a high-power direct-current power supply.
Background
The basic principle of the rectification voltage-stabilized source is to rectify an alternating voltage into a direct voltage, and then the direct voltage is converted into a stable direct voltage through the processes of filtering and voltage stabilization (or voltage boosting and reducing). For the application occasions requiring low harmonic current input, the rectification link can adopt a PFC rectifier, a three-phase PWM rectifier and a three-phase input multi-pulse rectifier. The PFC rectifier and the three-phase PWM rectifier need to use a high-frequency switching action of a switching device, and have the advantages of large switching loss, low conversion efficiency, weak overload capacity and relatively low system reliability compared with a passive scheme when the power is high. The multi-pulse rectifier is a passive scheme, has the advantages of simple structure, high reliability, high efficiency, strong overload capacity, no generation of extra EMI (electro-magnetic interference) and the like, but has larger volume and weight compared with a high-frequency rectifying circuit. In the field of ships or aviation, a rectifying and voltage-stabilizing direct-current power supply with low harmonic current is generally needed, and the volume weight, reliability, efficiency and the like of the power supply are also required to be very high.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned shortcomings in the prior art, and provides a main circuit topology and a control method for a high-power dc power supply, which has a very small input-side current harmonic, and is high in efficiency, reliability, small in size and light in weight.
The purpose of the invention is realized by the following technical scheme: a main circuit topology of a high-power direct-current power supply comprises a first rectification voltage-stabilizing direct-current power supply unit and a second rectification voltage-stabilizing direct-current power supply unit; the first rectifying and voltage-stabilizing direct-current power supply unit is connected with the second rectifying and voltage-stabilizing direct-current power supply unit in series or in parallel;
the first rectifying and voltage-stabilizing direct-current power supply unit comprises a first soft start module, a triangular autotransformer, a first three-phase uncontrolled rectifying unit and a first boosting module which are sequentially connected; the second rectification voltage-stabilization direct-current power supply unit comprises a second soft start module, a star-shaped autotransformer, a second three-phase uncontrolled rectification unit and a second boosting module which are sequentially connected.
The invention is further provided that the triangular autotransformer comprises a first core column, a second core column and a third core column which are arranged in sequence; a first winding, a second winding and a third winding are respectively wound on the first core column, the second core column and the third core column; the tail end of the first winding is connected with the head end of the second winding; the tail end of the second winding is connected with the head end of the third winding; the tail end of the third winding is connected with the head end of the first winding; the head end of the first winding, the head end of the second winding and the head end of the first winding are respectively connected with the first soft start module; and the tail end of the first winding, the tail end of the second winding and the tail end of the third winding are respectively connected with the first three-phase uncontrolled rectifying unit.
The invention is further provided that a fourth winding, a fifth winding and a sixth winding are respectively wound on the first core column, the second core column and the third core column; the first winding, the second winding and the third winding are respectively provided with an upper interface and a lower interface; the upper interface of the first winding and the lower interface of the third winding are respectively connected with the middle part of the fifth winding; the upper interface of the second winding and the lower interface of the first winding are respectively connected with the middle part of the sixth winding; the upper interface of the third winding and the lower interface of the second winding are respectively connected with the middle part of the fourth winding; one end of the fourth winding, one end of the fifth winding and one end of the sixth winding are respectively connected with the first three-phase uncontrolled rectifying unit; the other end of the fourth winding, the other end of the fifth winding and the other end of the sixth winding are respectively connected with the first three-phase uncontrolled rectifying unit.
The invention is further provided that the star-shaped autotransformer comprises a fourth core column, a fifth core column and a sixth core column which are arranged in sequence; a seventh winding, an eighth winding and a ninth winding are respectively wound on the fourth core column, the fifth core column and the sixth core column; the tail end of the fourth core column, the tail end of the fifth core column and the tail end of the sixth core column are connected; the head end of the fourth core column, the head end of the fifth core column and the head end of the sixth core column are respectively connected with the first soft start module; and the middle parts of the fourth core column, the fifth core column and the sixth core column are respectively connected with the second three-phase uncontrolled rectifying unit.
The invention is further provided that a tenth winding, an eleventh winding and a twelfth winding are respectively wound on the fourth core column, the fifth core column and the sixth core column; the head end of the seventh winding is connected with the middle part of the eleventh winding and the tail end of the twelfth winding respectively; the head end of the eighth winding is connected with the middle part of the twelfth winding and the tail end of the tenth winding respectively; and the head end of the ninth winding is respectively connected with the middle part of the tenth winding and the tail end of the eleventh winding.
The invention is further arranged that the first boost module and the second boost module each comprise a boost inductor L1, a boost inductor L2, a switch tube T1, a diode D1 and a diode D2; one end of the boosting inductor L1 and one end of the boosting inductor L2 are both connected to the output ends of the first three-phase uncontrolled rectifying unit and the second three-phase uncontrolled rectifying unit; the other end of the boosting inductor L1 and the other end of the boosting inductor L2 are respectively connected with the switching end of a switching tube T1; the other end of the boosting inductor L1 is connected with the anode of a diode D1; the other end of the boosting inductor L2 is connected with the cathode of a diode D2.
A control method based on main circuit topology of high-power DC power supply comprises connecting a first rectifying voltage-stabilizing DC power supply unit and a second rectifying voltage-stabilizing DC power supply unit in parallel; further comprising the steps of:
a1: regulating the difference value between the instruction value udc of the direct current voltage output by the main circuit topology and the actual feedback value udc of the direct current voltage output by the system through a PI regulator;
a2: the output regulated by the PI regulator is subjected to amplitude limiter to obtain the uniform command current i _ L of each input inductive current;
a3: respectively adjusting the difference between the unified command current i _ L and the actual detection value of the input inductive current of each boosting module through respective PI regulators;
a4: and comparing the modulation waves obtained by the respective output amplitude limiters with respective triangular carriers to obtain PWM pulse driving signals of respective switching tubes to control the on-off of the respective switching tubes.
A control method based on main circuit topology of high-power DC power supply comprises connecting a first rectifying voltage-stabilizing DC power supply unit and a second rectifying voltage-stabilizing DC power supply unit in series; further comprising the steps of:
b1: regulating a difference value between a main circuit topology output direct current voltage instruction value udc and an actual feedback value udc1 of the first rectification voltage-stabilizing direct current power supply unit output direct current voltage and a difference value between an actual feedback value udc2 of the second rectification voltage-stabilizing direct current power supply unit output direct current voltage through a PI regulator;
b2: the output regulated by the PI regulator is subjected to amplitude limiter to respectively obtain a unified command current i1_ L of the input inductive current of the first rectifying and voltage-stabilizing direct-current power supply unit and a unified command current i2_ L of the input inductive current of the second rectifying and voltage-stabilizing direct-current power supply unit;
b3: respectively regulating the differences between the unified command current i1_ L and the unified command current i2_ L and the actual detection value of the input inductive current of each boosting module through respective PI regulators;
a4: and comparing the modulation waves obtained by the respective output amplitude limiters with respective triangular carriers to obtain PWM pulse driving signals of respective switching tubes to control the on-off of the respective switching tubes.
The invention has the beneficial effects that: based on the modular design concept, the first rectifying and voltage-stabilizing direct-current power supply unit and the second rectifying and voltage-stabilizing direct-current power supply unit are connected in parallel for operation, and the boosting module in each direct-current unit is connected in parallel for output, so that the redundant operation capacity of the system can be improved; for a large-capacity direct current power supply, when low-voltage large current is required, parallel operation is adopted, and when high-voltage small current is required, a serial operation scheme is adopted, so that the system is convenient to combine.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic diagram of the architecture of the present invention in parallel operation;
FIG. 2 is a schematic diagram of the architecture of the present invention when operating in tandem;
FIG. 3 is a schematic diagram of a triangular autotransformer of the present invention;
FIG. 4 is a schematic diagram of a triangular autotransformer of the present invention;
FIG. 5 is a vector phase diagram of the input voltage versus the output voltage of the triangular autotransformer of the present invention;
FIG. 6 is a diagram of the external wiring interface of the triangular autotransformer of the present invention;
FIG. 7 is a schematic diagram of a star autotransformer of the present invention;
FIG. 8 is a schematic diagram of the construction of the star autotransformer of the present invention;
FIG. 9 is a vector phase diagram of the input voltage versus the output voltage of the star autotransformer of the present invention;
FIG. 10 is a diagram of the external wiring interface of the star autotransformer of the present invention;
FIG. 11 is a diagram of a simulation model of the present invention;
FIG. 12 is a control schematic of the invention operating in parallel;
FIG. 13 is a control schematic of the present invention operating in series;
wherein: 1. a first rectifying and voltage-stabilizing direct-current power supply unit; 11. a first soft start module; 12. a triangular autotransformer; 13. a first three-phase uncontrolled rectifying unit; 14. a first boost module; 2. a second rectifying and voltage-stabilizing direct-current power supply unit; 21. a second soft start module; 22. a star autotransformer; 23. a second three-phase uncontrolled rectifying unit; 24. a second boost module; 31. a first stem; 32. a second stem; 33. a third stem; 41. a first winding; 42. a second winding; 43. a third winding; 44. a fourth winding; 45. a fifth winding; 46. a sixth winding; 51. a fourth leg; 52. a fifth stem; 53. a sixth leg; 61. a seventh winding; 62. an eighth winding; 63. a ninth winding; 64. a tenth winding; 65. an eleventh winding; 66. and a twelfth winding.
Detailed Description
The invention is further described with reference to the following examples.
As shown in fig. 1 to 11, the main circuit topology of the high-power dc power supply according to the present embodiment includes a first rectifying and voltage-stabilizing dc power supply unit 1 and a second rectifying and voltage-stabilizing dc power supply unit 2; the first rectifying and voltage-stabilizing direct-current power supply unit 1 and the second rectifying and voltage-stabilizing direct-current power supply unit 2 are connected in series or in parallel;
the first rectifying and voltage-stabilizing direct-current power supply unit 1 comprises a first soft start module 11, a triangular autotransformer 12, a first three-phase uncontrolled rectifying unit 13 and a first boosting module 14 which are sequentially connected; the second rectifying and voltage-stabilizing direct-current power supply unit 2 comprises a second soft start module 21, a star-shaped autotransformer 22, a second three-phase uncontrolled rectifying unit 23 and a second boosting module 24 which are sequentially connected.
Specifically, in the main circuit topology of the high-power dc power supply described in this embodiment, when the first rectifying and voltage-stabilizing dc power supply unit 1 and the second rectifying and voltage-stabilizing dc power supply unit 2 are connected in parallel, the boost module in each rectifying and voltage-stabilizing dc power supply unit is connected in parallel for output, so that the redundant operation capability of the system can be improved; in addition, the first rectification voltage-stabilizing direct-current power supply unit 1 and the second rectification voltage-stabilizing direct-current power supply unit 2 are connected in parallel to operate, 18-pulse autotransformer rectification with the main windings in triangular connection is adopted in the first rectification voltage-stabilizing direct-current power supply unit 1, 18-pulse autotransformer rectification with the main windings in star connection is adopted in the second rectification voltage-stabilizing direct-current power supply unit 2, the harmonic content of input current of a system with the two connected in parallel to operate is reduced by more than half, and the system is equivalent to 36-pulse rectification.
When a high-capacity direct-current power supply needs low-voltage and high-current application, the first rectification voltage-stabilization direct-current power supply unit 1 and the second rectification voltage-stabilization direct-current power supply unit 2 are operated in parallel, and when high-voltage and low-current application is needed, the first rectification voltage-stabilization direct-current power supply unit 1 and the second rectification voltage-stabilization direct-current power supply unit 2 are operated in series, so that the system is convenient to combine.
Because the system adopts an 18-pulse autotransformer rectification mode, the total capacity of the transformer can be greatly smaller due to the technical characteristics of the transformer, even can be smaller than 1/3 of the total system power, and the high power factor can be realized. Besides, the direct-current voltage is used for boosting and stabilizing voltage, and a small number of switching devices are used, other main devices are high-reliability devices, and switching loss is small, so that the system is high in reliability and high in efficiency compared with a PWM (pulse-width modulation) rectification power supply and the like. Meanwhile, the system adopts a system current control mode of a concentrated voltage outer closed loop and an independent current inner closed loop of each boosting and voltage stabilizing unit, so that the current equalizing condition of each boosting and voltage stabilizing unit and each three-phase uncontrolled rectifier bridge can be effectively improved, the power balance is realized, the heat dissipation design of the system is facilitated, and the high reliability of the system is promoted.
In the main circuit topology of the high-power dc power supply described in this embodiment, the triangular autotransformer 12 includes a first core column 31, a second core column 32, and a third core column 33, which are sequentially arranged; a first winding 41, a second winding 42 and a third winding 43 are respectively wound on the first core limb 31, the second core limb 32 and the third core limb 33; the tail end of the first winding 41 is connected with the head end of the second winding 42; the tail end of the second winding 42 is connected with the head end of the third winding 43; the tail end of the third winding 43 is connected with the head end of the first winding 41; the head end of the first winding 41, the head end of the second winding 42 and the head end of the first winding 41 are respectively connected with the first soft start module 11; the end of the first winding 41, the end of the second winding 42 and the end of the third winding 43 are connected to the first three-phase uncontrolled rectifying unit 13, respectively.
In the main circuit topology of the high-power dc power supply described in this embodiment, a fourth winding 44, a fifth winding 45, and a sixth winding 46 are respectively wound on the first core limb 31, the second core limb 32, and the third core limb 33; the first winding 41, the second winding 42 and the third winding 43 are respectively provided with an upper interface and a lower interface; the upper interface of the first winding 41 and the lower interface of the third winding 43 are respectively connected with the middle part of the fifth winding 45; the upper interface of the second winding 42 and the lower interface of the first winding 41 are respectively connected with the middle part of a sixth winding 46; the upper interface of the third winding 43 and the lower interface of the second winding 42 are respectively connected with the middle part of the fourth winding 44; one end of the fourth winding 44, one end of the fifth winding 45 and one end of the sixth winding 46 are respectively connected with the first three-phase uncontrolled rectifying unit 13; the other end of the fourth winding 44, the other end of the fifth winding 45 and the other end of the sixth winding 46 are connected to the first three-phase uncontrolled rectifying unit 13, respectively.
Specifically, the main windings connected to the input voltage of the autotransformer of the first rectifying, voltage-stabilizing, dc power supply unit 1 of the present embodiment are connected in delta, and as shown in fig. 3 and 4, the first winding 41, the second winding 42, and the third winding 43 (windings ab, bc, and ca) are main windings connected in delta end-to-end, and are wound on three different magnetic bead columns, and are externally connected to the input line voltages (UAB, UBC, UCA), while the other windings are auxiliary windings, and are used to form the required output voltage magnitude and phase shift. The magnitude and phase relationship of the input voltage and the output voltage are shown in FIG. 5, and a three-phase symmetrical voltage vector U is outputa、UbAnd UcSequentially and respectively symmetrical with three-phase input voltage vectorQuantity UAB、UBCAnd UCASame phase, Ua'Leading UaElectrical angle 20 degree, Ua”Lagging UaElectrical angle 20 degrees, similarly, Ub'Leading UbElectrical angle 20 degree, Ub”Lagging UbElectrical angle 20 degree, Uc'Leading UcElectrical angle 20 degree, Uc”Lagging UcThe electrical angle is 20 degrees, and the U is designed by proper winding turnsa、Ua'、Ua”、Ub、Ub'、Ub”、Uc、Uc'、Uc”The magnitude of the 9 output voltage vectors is substantially the same. Output voltage Ua、UbAnd UcFor supplying a three-phase uncontrolled rectifier bridge, Ua'、Ub'And Uc'For supplying a three-phase uncontrolled rectifier bridge, Ua”、Ub”And Uc”And supplying power to a three-phase uncontrolled rectifier bridge.
In the main circuit topology of the high-power dc power supply according to this embodiment, the star autotransformer 22 includes a fourth core limb 51, a fifth core limb 52, and a sixth core limb 53, which are sequentially disposed; a seventh winding 61, an eighth winding 62 and a ninth winding 63 are wound on the fourth core leg 51, the fifth core leg 52 and the sixth core leg 53 respectively; the tail end of the fourth core leg 51, the tail end of the fifth core leg 52 and the tail end of the sixth core leg 53 are connected; the head end of the fourth core column 51, the head end of the fifth core column 52 and the head end of the sixth core column 53 are respectively connected with the first soft start module 11; the middle part of the fourth core column 51, the middle part of the fifth core column 52 and the middle part of the sixth core column 53 are respectively connected with the second three-phase uncontrolled rectifying unit 23.
In the main circuit topology of the high-power dc power supply according to this embodiment, a tenth winding 64, an eleventh winding 65 and a twelfth winding 66 are respectively wound on the fourth core leg 51, the fifth core leg 52 and the sixth core leg 53; the head end of the seventh winding 61 is respectively connected with the middle part of the eleventh winding 65 and the tail end of the twelfth winding 66; the head end of the eighth winding 62 is connected with the middle part of the twelfth winding 66 and the tail end of the tenth winding 64 respectively; the head end of the ninth winding 63 is connected to the middle of the tenth winding 64 and the tail end of the eleventh winding 65, respectively.
Specifically, in the main circuit topology of the high power dc power supply described in this embodiment, the main winding connected to the input voltage of the autotransformer of the second rectifying and voltage-stabilizing dc power supply unit 2 is in a star connection, as shown in fig. 7 and 8, the seventh winding 61, the eighth winding 62, and the ninth winding 63 (windings AN, BN, and CN) are main windings connected in a star shape at the tail end, and are wound on three different magnetic bead columns, and the external input line voltages (UAB, UBC, UCA) are connected thereto, and the other windings are auxiliary windings for forming the required output voltage and phase shift. The magnitude and phase relationship of the input voltage and the output voltage are shown in FIG. 9, and a three-phase symmetrical voltage vector V is outputa、VbAnd VcInput voltage vector U sequentially and respectively symmetrical with three phasesAN、UBNAnd UCNIn phase, Va'Advance VaElectrical angle 20 degree, Va”Hysteresis VaElectrical angle of 20 degrees, likewise, Vb'Advance VbElectrical angle 20 degree, Vb”Hysteresis VbElectrical angle 20 degree, Vc'Advance VcElectrical angle 20 degree, Vc”Hysteresis VcThe electrical angle is 20 degrees, and V is designed by proper winding turnsa、Va'、Va”、Vb、Vb'、Vb”、Vc、Vc'、Vc”The magnitude of the 9 output voltage vectors is substantially the same. Output voltage Va、VbAnd VcFor supplying a three-phase uncontrolled rectifier bridge, Va'、Vb'And Vc'For supplying a three-phase uncontrolled rectifier bridge, Va”、Vb”And Vc”And supplying power to a three-phase uncontrolled rectifier bridge.
As can be seen from fig. 3 to 10, since the input voltage of the autotransformer with the delta-connected main windings is a three-phase line voltage, the phase voltage of the inner main winding in the transformer is an external three-phase ac input line voltage, and in the autotransformer with the star-connected main windings, although the input voltage is still the external three-phase ac input line voltage, the inner main winding in the transformer is still the external three-phase ac input line voltageThe phase voltage of the winding is actually the external power phase voltage, so when the three-phase ac power is shared by the main winding delta-connected autotransformer and the main winding star-connected autotransformer through the common cable, the output voltage V in fig. 6 isaLags behind U in FIG. 4aCorrespondingly, the other output voltage vectors V in FIG. 6a、Va'、Va”、Vb、Vb'、Vb”、Vc、Vc'、Vc”Respectively lagging behind Ua、Ua'、Ua”、Ub、Ub'、Ub”、Uc、Uc'、Uc”And the output voltage amplitude of the autotransformer with the triangular connection of the main winding and the output voltage amplitude of the autotransformer with the star connection of the main winding can be basically consistent by accurately designing the number of turns of the winding.
Under the above conditions, in the system structure shown in fig. 1, the two circuits of the autotransformer rectification with the triangular connection of the main winding and the autotransformer rectification with the star connection of the main winding operate in parallel, and under the condition that each original autotransformer is 18-pulse rectification, the two circuits operate in parallel through 30-degree phase dislocation between the voltages of the main winding, so that the 36-pulse rectification effect can be achieved, and the total harmonic content on the input side of the system is greatly reduced.
Fig. 11 is a theoretical simulation model result, in which the two waveforms of the upper waveform are respectively a waveform of an 18-pulse auto-transformer rectification input a-phase circuit in delta connection with the main winding and a waveform of an 18-pulse auto-transformer rectification input a-phase circuit in star connection with the main winding, and the simulation shows that the current harmonic THD is about 11%, and the lower waveform is a waveform of a total current input by the two parallel connections, and the simulation shows that the current harmonic THD is about 6%. Therefore, the two autotransformers run in parallel, the number of steps of the input current waveform is obviously increased by 1 time, and the current harmonic THD value is greatly reduced.
In the main circuit topology of the high-power dc power supply described in this embodiment, the first boost module 14 and the second boost module 24 each include a boost inductor L1, a boost inductor L2, a switching tube T1, a diode D1, and a diode D2; one end of the boost inductor L1 and one end of the boost inductor L2 are both connected to the output ends of the first three-phase uncontrolled rectifying unit 13 and the second three-phase uncontrolled rectifying unit 23; the other end of the boosting inductor L1 and the other end of the boosting inductor L2 are respectively connected with the switching end of a switching tube T1; the other end of the boosting inductor L1 is connected with the anode of a diode D1; the other end of the boosting inductor L2 is connected with the cathode of a diode D2.
Specifically, the output of each three-phase uncontrolled rectifier bridge is connected with a boosting module which is improved based on a traditional boost circuit. The voltage-boosting circuit comprises a voltage-boosting inductor L1, a voltage-boosting inductor L2, a semiconductor power switching tube T1 (such as an IGBT), a diode D1, a diode D2, an energy storage capacitor at an output direct-current output side, a current sensor for detecting the inductive current required by control, a voltage detection sensor for outputting voltage and the like. (in the case where a plurality of such voltage boosting regulator circuits are output in parallel, only one voltage sensor needs to be provided in total).
The diode D1 and the diode D2 are introduced to achieve that when one or more switches of the boost circuit are turned off, the current flowing through the current boost circuit can smoothly return from other boost circuits. In addition, the boost inductor of the traditional boost circuit is divided into two parts in the circuit, which is beneficial to improving the control independence of each boost voltage stabilizing circuit.
In addition, a control mode of a voltage outer ring current inner ring is adopted, the difference value of the given output voltage and the output direct current voltage fed back by actual detection is regulated by a PI regulator, the output of the PI regulator is subjected to amplitude limiter to obtain the instruction current of the input inductive current, the difference value of the instruction current and the input inductive current actually detected is regulated by the PI regulator, and the output of the PI regulator is subjected to comparison of the modulation wave obtained by the amplitude limiter and a triangular carrier to obtain a PWM pulse driving signal of a switching tube T1 to control the on-off of the T1.
As shown in fig. 12, in the control method of the main circuit topology based on the high-power dc power supply according to this embodiment, the first rectifying and voltage-stabilizing dc power supply unit 1 is connected in parallel with the second rectifying and voltage-stabilizing dc power supply unit 2; further comprising the steps of:
a1: regulating the difference value between the instruction value udc of the direct current voltage output by the main circuit topology and the actual feedback value udc of the direct current voltage output by the system through a PI regulator;
a2: the output regulated by the PI regulator is subjected to amplitude limiter to obtain the uniform command current i _ L of each input inductive current;
a3: respectively adjusting the difference between the unified command current i _ L and the actual detection value of the input inductive current of each boosting module through respective PI regulators;
a4: and comparing the modulation waves obtained by the respective output amplitude limiters with respective triangular carriers to obtain PWM pulse driving signals of respective switching tubes to control the on-off of the respective switching tubes.
Specifically, three boosting modules in the first rectifying and voltage-stabilizing dc power supply unit 1 and the second rectifying and voltage-stabilizing dc power supply unit 2 respectively share output voltage and operate in parallel, and after the first rectifying and voltage-stabilizing dc power supply unit 1 and the second rectifying and voltage-stabilizing dc power supply unit 2 operate in parallel again, the total of six boosting and voltage-stabilizing circuits share output voltage and operate in parallel. The output voltage control of the system is how to coordinate the high-speed on-off action of the semiconductor power switch tubes in each boost stabilizing circuit from the overall perspective.
The idea here is to adjust the difference between the system output dc voltage command value udc and the actual feedback value udc of the system output dc voltage by a PI regulator, and then output the difference through a limiter to obtain a unified command current i _ L of each input inductor current, and the unified command current value is respectively adjusted by the PI regulator, and the difference between the unified command current value and the actual detected value of the input inductor current of each boost stabilizing circuit is compared with the respective triangular carrier to obtain the PWM pulse driving signal of each switching tube, so as to control the on/off of each semiconductor power switching tube. The triangular carrier frequencies are the same, and in order to realize equivalent high switching frequency and reduce the output direct-current voltage ripple size, a triangular carrier phase shift control method is adopted, namely triangular carriers TR1, TR2 and TR3 are sequentially shifted by 60 degrees from each other, and triangular carriers TR4, TR5 and TR6 are sequentially shifted by 60 degrees from each other.
As shown in fig. 13, in the control method of the main circuit topology based on the high-power dc power supply according to this embodiment, the first rectifying and voltage-stabilizing dc power supply unit 1 is connected in series with the second rectifying and voltage-stabilizing dc power supply unit 2; further comprising the steps of:
b1: regulating a difference value between a main circuit topology output direct current voltage instruction value udc and an actual feedback value udc1 of the direct current voltage output by the first rectifying and voltage-stabilizing direct current power supply unit 1 and a difference value between an actual feedback value udc2 of the direct current voltage output by the second rectifying and voltage-stabilizing direct current power supply unit 2 through a PI regulator;
b2: the output regulated by the PI regulator is subjected to amplitude limiter to respectively obtain a unified command current i1_ L of the input inductive current of the first rectifying and voltage-stabilizing direct-current power supply unit 1 and a unified command current i2_ L of the input inductive current of the second rectifying and voltage-stabilizing direct-current power supply unit 2;
b3: respectively regulating the differences between the unified command current i1_ L and the unified command current i2_ L and the actual detection value of the input inductive current of each boosting module through respective PI regulators;
a4: and comparing the modulation waves obtained by the respective output amplitude limiters with respective triangular carriers to obtain PWM pulse driving signals of respective switching tubes to control the on-off of the respective switching tubes.
Specifically, three respective boost voltage stabilizing circuits in the first rectifying and voltage stabilizing direct-current power supply unit 1 and the second rectifying and voltage stabilizing direct-current power supply unit 2 run in parallel with a common output voltage, and the three boost voltage stabilizing circuits of each direct-current unit adopt a coordination control mode of a voltage concentration outer closed loop and a current separation inner closed loop. In order to realize the target value of the system output voltage after the series connection, the output voltage control instruction values of the first rectifying and voltage-stabilizing direct-current power supply unit 1 and the second rectifying and voltage-stabilizing direct-current power supply unit 2 are half of the target value of the system output voltage.
The difference value between the control instruction value of the output direct current voltage of the first rectification voltage-stabilizing direct current power supply unit 1 and the actual feedback value of the output direct current voltage of the second rectification voltage-stabilizing direct current power supply unit 2 is regulated by a PI regulator, the output of the PI regulator is regulated by a limiter to obtain the unified instruction current of the inductive current of each boosting voltage-stabilizing circuit, the unified instruction current value is respectively different from the actual detection value of the input inductive current of each boosting voltage-stabilizing circuit, the unified instruction current value is regulated by the respective PI regulator, and the modulation wave obtained after the respective output is regulated by the limiter is compared with the respective triangular carrier to obtain the PWM pulse driving signal of the respective switching tube to control the on-off of the respective semiconductor power switching tube. The triangular carrier frequencies are the same, and in order to realize equivalent high switching frequency and reduce the output direct-current voltage ripple size, a triangular carrier phase shift control method is adopted, namely triangular carriers TR1, TR2 and TR3 are sequentially shifted by 60 degrees from each other, and triangular carriers TR4, TR5 and TR6 are sequentially shifted by 60 degrees from each other.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A main circuit topology of a high-power direct-current power supply is characterized in that: comprises a first rectifying and voltage-stabilizing direct-current power supply unit (1) and a second rectifying and voltage-stabilizing direct-current power supply unit (2); the first rectifying and voltage-stabilizing direct-current power supply unit (1) and the second rectifying and voltage-stabilizing direct-current power supply unit (2) are connected in series or in parallel;
the first rectifying and voltage-stabilizing direct-current power supply unit (1) comprises a first soft start module (11), a triangular autotransformer (12), a first three-phase uncontrolled rectifying unit (13) and a first boosting module (14) which are sequentially connected; the second rectification and voltage stabilization direct-current power supply unit (2) comprises a second soft start module (21), a star-shaped autotransformer (22), a second three-phase uncontrolled rectification unit (23) and a second boosting module (24) which are sequentially connected.
2. The main circuit topology of a high power dc power supply according to claim 1, wherein: the triangular autotransformer (12) comprises a first core column (31), a second core column (32) and a third core column (33) which are sequentially arranged; a first winding (41), a second winding (42) and a third winding (43) are respectively wound on the first core column (31), the second core column (32) and the third core column (33); the tail end of the first winding (41) is connected with the head end of the second winding (42); the tail end of the second winding (42) is connected with the head end of the third winding (43); the tail end of the third winding (43) is connected with the head end of the first winding (41); the head end of the first winding (41), the head end of the second winding (42) and the head end of the first winding (41) are respectively connected with the first soft start module (11); the tail end of the first winding (41), the tail end of the second winding (42) and the tail end of the third winding (43) are respectively connected with the first three-phase uncontrolled rectifying unit (13).
3. The main circuit topology of a high power dc power supply according to claim 2, wherein: a fourth winding (44), a fifth winding (45) and a sixth winding (46) are respectively wound on the first core column (31), the second core column (32) and the third core column (33); the first winding (41), the second winding (42) and the third winding (43) are respectively provided with an upper interface and a lower interface; the upper interface of the first winding (41) and the lower interface of the third winding (43) are respectively connected with the middle part of a fifth winding (45); the upper interface of the second winding (42) and the lower interface of the first winding (41) are respectively connected with the middle part of a sixth winding (46); the upper interface of the third winding (43) and the lower interface of the second winding (42) are respectively connected with the middle part of the fourth winding (44); one end of the fourth winding (44), one end of the fifth winding (45) and one end of the sixth winding (46) are respectively connected with the first three-phase uncontrolled rectifying unit (13); the other end of the fourth winding (44), the other end of the fifth winding (45) and the other end of the sixth winding (46) are respectively connected with the first three-phase uncontrolled rectifying unit (13).
4. The main circuit topology of a high power dc power supply according to claim 1, wherein: the star-shaped autotransformer (22) comprises a fourth core column (51), a fifth core column (52) and a sixth core column (53) which are sequentially arranged; a seventh winding (61), an eighth winding (62) and a ninth winding (63) are respectively wound on the fourth core column (51), the fifth core column (52) and the sixth core column (53); the tail end of the fourth core leg (51), the tail end of the fifth core leg (52) and the tail end of the sixth core leg (53) are connected; the head end of the fourth core column (51), the head end of the fifth core column (52) and the head end of the sixth core column (53) are respectively connected with the first soft start module (11); the middle part of the fourth core column (51), the middle part of the fifth core column (52) and the middle part of the sixth core column (53) are respectively connected with the second three-phase uncontrolled rectifying unit (23).
5. The main circuit topology of a high power dc power supply according to claim 4, wherein: a tenth winding (64), an eleventh winding (65) and a twelfth winding (66) are respectively wound on the fourth core column (51), the fifth core column (52) and the sixth core column (53); the head end of the seventh winding (61) is respectively connected with the middle part of the eleventh winding (65) and the tail end of the twelfth winding (66); the head end of the eighth winding (62) is respectively connected with the middle part of the twelfth winding (66) and the tail end of the tenth winding (64); the head end of the ninth winding (63) is respectively connected with the middle part of the tenth winding (64) and the tail end of the eleventh winding (65).
6. The main circuit topology of a high power dc power supply according to claim 1, wherein: the first voltage boosting module (14) and the second voltage boosting module (24) respectively comprise a voltage boosting inductor L1, a voltage boosting inductor L2, a switching tube T1, a diode D1 and a diode D2; one end of the boosting inductor L1 and one end of the boosting inductor L2 are both connected to the output ends of the first three-phase uncontrolled rectifying unit (13) and the second three-phase uncontrolled rectifying unit (23); the other end of the boosting inductor L1 and the other end of the boosting inductor L2 are respectively connected with the switching end of a switching tube T1; the other end of the boosting inductor L1 is connected with the anode of a diode D1; the other end of the boosting inductor L2 is connected with the cathode of a diode D2.
7. A control method of a main circuit topology based on the high power DC power supply of claim 6, characterized in that: the first rectifying and voltage-stabilizing direct-current power supply unit (1) is connected with the second rectifying and voltage-stabilizing direct-current power supply unit (2) in parallel; further comprising the steps of:
a1: regulating the difference value between the instruction value udc of the direct current voltage output by the main circuit topology and the actual feedback value udc of the direct current voltage output by the system through an P I regulator;
a2: the output regulated by the P I regulator is subjected to amplitude limiter to obtain the uniform command current i _ L of each input inductive current;
a3: respectively adjusting the difference between the unified command current i _ L and the actual detection value of the input inductive current of each boosting module through respective PI regulators;
a4: and comparing the modulation waves obtained by the respective output amplitude limiters with respective triangular carriers to obtain PWM pulse driving signals of respective switching tubes to control the on-off of the respective switching tubes.
8. A control method of a main circuit topology based on the high power DC power supply of claim 6, characterized in that: the first rectifying and voltage-stabilizing direct-current power supply unit (1) is connected with the second rectifying and voltage-stabilizing direct-current power supply unit (2) in series; further comprising the steps of:
b1: regulating a difference value between a main circuit topology output direct current voltage instruction value udc and an actual feedback value udc1 of the direct current voltage output by the first rectifying and voltage-stabilizing direct current power supply unit (1) and a difference value between an actual feedback value udc2 of the direct current voltage output by the second rectifying and voltage-stabilizing direct current power supply unit (2) through a PI regulator;
b2: the output regulated by the P I regulator is subjected to amplitude limiter to respectively obtain a unified instruction current i1_ L of the inductive current input by the first rectification voltage-stabilizing direct-current power supply unit (1) and a unified instruction current i2_ L of the inductive current input by the second rectification voltage-stabilizing direct-current power supply unit (2);
b3: respectively adjusting the differences between the unified command current i1_ L and the unified command current i2_ L and the actual detection values of the input inductive currents of the boosting modules through respective PI regulators;
a4: and comparing the modulation waves obtained by the respective output amplitude limiters with respective triangular carriers to obtain PWM pulse driving signals of respective switching tubes to control the on-off of the respective switching tubes.
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