CN111384764A - High-capacity hybrid rectification charging pile and control method thereof - Google Patents
High-capacity hybrid rectification charging pile and control method thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal 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 in a biphase or polyphase circuit arrangement
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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
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/23—Conversion of ac power input into dc power output without possibility of reversal 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 arranged for operation in parallel
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Abstract
The invention relates to the technical field of electronics, and discloses a high-capacity hybrid rectification charging pile and a control method thereof. The first rectifier is a single-switch three-phase boost rectifier, and the second rectifier is a vienna rectifier. By combining a vienna rectifier, which has the advantages of high power factor and low harmonic rate, with a single-switch three-phase boost rectifier, the hybrid rectifier can be made to have the advantages of both the single-switch three-phase boost rectifier and the vienna rectifier. The hybrid rectifier can simultaneously realize the advantages of low harmonic and high power factor of alternating current on the premise of realizing stable output of direct current voltage and quick charging. The control method can ensure that the high-capacity hybrid rectification charging pile does not increase hardware cost, volume and weight, and can optimize current waveform and improve power quality.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a high-capacity hybrid rectification charging pile and a control method thereof.
Background
Along with the rapid increase of the number of electric vehicles, the charging demand of the electric vehicles is also increased, so that the public puts strict requirements on the quality and control of charging piles. The performance of the rectifier in the charging pile has great influence on the electric energy quality of the working environment of the charging pile. In the existing charging pile technology, a single switch three-phase boost rectifier (SSTPBR) -based charging pile has the advantages of high efficiency, high power density, high reliability and low cost, but also has the disadvantages of low power factor and high harmonic rate. It is a problem to provide a rectifier with high efficiency, high power density, high reliability, high power factor, low cost and low harmonic rate.
Disclosure of Invention
In view of the above, it is necessary to provide a large-capacity hybrid rectification charging pile and a control method thereof.
A high-capacity hybrid rectification charging pile is characterized by comprising a charging pile body and a hybrid rectifier arranged on the charging pile body, wherein the hybrid rectifier comprises a first rectifier and a second rectifier, and the first rectifier is connected with the second rectifier in parallel; the first rectifier is a single-switch three-phase boost rectifier, and the second rectifier is a Vienna rectifier.
Above-mentioned large capacity mixes rectification and fills electric pile, including mixing the rectifier. The hybrid rectifier comprises a first rectifier and a second rectifier, the first rectifier is a single-switch three-phase boost rectifier, the second rectifier is a Vienna rectifier, the first rectifier is connected with the second rectifier in parallel, and input ends of the first rectifier and the second rectifier are both connected with an alternating current power supply. By combining a vienna rectifier, which has the advantages of high power factor and low harmonic rate, with a single-switch three-phase boost rectifier, the hybrid rectifier can be made to have the advantages of both the single-switch three-phase boost rectifier and the vienna rectifier. The high-capacity hybrid rectification charging pile realizes low harmonic and high power factor of alternating current on the premise of realizing stable output of direct current voltage and quick charging.
In one embodiment, the hybrid rectifier further comprises a first capacitor and a second capacitor, wherein a cathode of the first capacitor is connected to an anode of the second capacitor.
In one embodiment, the input end of the hybrid rectifier is connected with a three-phase power supply, the three-phase power supply comprises a first-phase power supply, a second-phase power supply and a third-phase power supply, the first rectifier comprises a first switching device, a second switching device, a third switching device, a fourth switching device, a fifth switching device, a sixth switching device, a seventh switching device, an eighth switching device, a ninth switching device, a first inductor and a second inductor; wherein the positive electrode of the first switching device is connected to the first phase power supply and the negative electrode of the fourth switching device, respectively; the anode of the second switching device is respectively connected with the second phase power supply and the cathode of the fifth switching device; the anode of the third switching device is connected with the third phase power supply and the cathode of the sixth switching device respectively; the cathodes of the first switch device, the second switch device and the third switch device are all connected with one end of the first inductor, and the other end of the first inductor is connected with the anode of the seventh switch device; the negative electrode of the seventh switching device is connected with the positive electrode of the first capacitor; the negative electrode of the second capacitor is connected with the positive electrode of the eighth switching device; the negative electrode of the eighth switching device is connected with one end of the second inductor, and the other end of the second inductor is respectively connected with the positive electrodes of the fourth switching device, the fifth switching device and the sixth switching device; a collector of the ninth switching device is connected to an anode of the seventh switching device, and an emitter of the ninth switching device is connected to a cathode of the eighth switching device.
In one embodiment, the second rectifier includes a tenth switching device, an eleventh switching device, a twelfth switching device, a tenth switching device, a fourteenth switching device, a fifteenth switching device, a sixteenth switching device, a seventeenth switching device, an eighteenth switching device, a nineteenth switching device, a twentieth switching device, a twenty-first switching device, a twenty-second switching device, a twentieth switching device, a twenty-fourteenth switching device, a twenty-fifth switching device, a twenty-sixth switching device, a twenty-seventh switching device, a twenty-eighteenth switching device, a twenty-ninth switching device, a thirtieth switching device, a third inductor, a fourth inductor, a fifth inductor, a first resistor, a second resistor, and a third resistor; one end of the third inductor is connected with the first-phase power supply, the other end of the third inductor is connected with one end of the first resistor, and the other end of the first resistor is respectively connected with the anode of the tenth switching device and the cathode of the eleventh switching device; one end of the fourth inductor is connected with the second-phase power supply, the other end of the fourth inductor is connected with one end of the second resistor, and the other end of the second resistor is respectively connected with the anode of the fourteenth switching device and the cathode of the fifteenth switching device; one end of the fifth inductor is connected with the third phase power supply, the other end of the fifth inductor is connected with one end of the third resistor, and the other end of the third resistor is respectively connected with the anode of the eighteenth switching device and the cathode of the nineteenth switching device; a cathode of the tenth switching device, a collector of the twenty-eighth switching device and a cathode of the twelfth switching device are all connected with an anode of the twenty-second switching device, an anode of the eleventh switching device, an emitter of the twenty-eighth switching device and an anode of the tenth switching device are all connected with a cathode of the twenty-fifth switching device, and an anode of the twelfth switching device and a cathode of the tenth switching device are connected with a cathode of the first capacitor; a cathode of the fourteenth switching device, a collector of the twenty-ninth switching device and a cathode of the sixteenth switching device are all connected with an anode of the twentieth switching device, an anode of the fifteenth switching device, an emitter of the twenty-ninth switching device and an anode of the seventeenth switching device are all connected with a cathode of the twenty-sixth switching device, and an anode of the sixteenth switching device and a cathode of the seventeenth switching device are connected with a cathode of the first capacitor; a cathode of the eighteenth switching device, a collector of the thirtieth switching device and a cathode of the twentieth switching device are all connected with an anode of the twenty-fourth switching device, an anode of the nineteenth switching device, an emitter of the thirtieth switching device and an anode of the twenty-first switching device are all connected with a cathode of the twenty-seventh switching device, and an anode of the twentieth switching device and a cathode of the twenty-first switching device are connected with a cathode of the first capacitor; the connection point of the cathodes of the twenty-second switching device, the twenty-fourth switching device and the twenty-second switching device which are sequentially connected serves as the anode of the second rectifier and is connected with the anode of the first capacitor; and the connecting points of the anodes of the twenty-fifth switching device, the twenty-sixth switching device and the twenty-seventh switching device which are sequentially connected are used as the cathode of the second rectifier and are connected with the cathode of the second capacitor.
In one embodiment, the hybrid rectifier further includes a fourth resistor, one end of the fourth resistor is connected to the positive electrode of the second rectifier, and the other end of the fourth resistor is connected to the negative electrode of the second rectifier.
In one embodiment, the first switch device, the second switch device, the third switch device, the fourth switch device, the fifth switch device, the sixth switch device, the seventh switch device, the eighth switch device, the tenth switch device, the eleventh switch device, the twelfth switch device, the tenth switch device, the fourteenth switch device, the fifteenth switch device, the sixteenth switch device, the seventeenth switch device, the eighteenth switch device, the nineteenth switch device, the twentieth switch device, the twenty-first switch device, the twenty-second switch device, the twenty-third switch device, the twenty-fourteenth switch device, the twenty-fifth switch device, the twenty-sixth switch device, and the twenty-seventh switch device are diodes.
In one embodiment, the ninth switching device, the twenty-eighth switching device, the twenty-ninth switching device and the thirtieth switching device are all fully-controlled power switching tubes.
A control method of a high-capacity hybrid rectification charging pile comprises a hybrid rectifier, wherein the input end of the hybrid rectifier is connected with a three-phase power supply, the hybrid rectifier comprises a first rectifier and a second rectifier, the control method comprises the steps of detecting a first input electric signal and a first rectification signal of the first rectifier, a second input electric signal and a second rectification signal of the second rectifier, and acquiring an alternating current electric signal of the three-phase power supply and a current output signal and a voltage output signal of the hybrid rectifier; wherein the alternating current electrical signal is a sum of the first input electrical signal and the second input electrical signal, and the current output signal is a sum of the first rectified signal and the second rectified signal; acquiring a first control signal of the first rectifier according to the current output signal and the first input electric signal; acquiring a second control signal of the second rectifier according to the alternating current signal, the voltage output signal, the first input electrical signal and the second input electrical signal; transmitting the first control signal to the first rectifier and the second control signal to the second rectifier to regulate power distribution within the hybrid rectifier.
In one embodiment, said obtaining a first control signal of said first rectifier according to said output electrical signal and said first input electrical signal comprises applying a frequency N multiplied alternating current component as a first reference current of said first rectifier to said current output signal; wherein the value of N is 6; carrying out current closed-loop control on the first reference current and the first rectification signal to obtain a duty ratio D of a first driving signal; and according to a sine wave modulation or space vector modulation method, performing pulse control on the duty ratio D to obtain a first driving signal as the first control signal.
In one embodiment, the first reference current is calculated by the following formula:
wherein idc *Is the first reference current iLFor the current output signal, ω is angular velocity, t is time, k1、k2Two scaling factors respectively.
In one embodiment, the obtaining the second control signal of the second rectifier according to the ac electrical signal, the voltage output signal, the first input electrical signal, and the second input electrical signal includes obtaining a current reference value of the hybrid rectifier through PI control based on a difference between a voltage reference value of the voltage output signal and the measured voltage output signal; acquiring a second reference current of the second rectifier according to the current reference value, the first input electric signal and the alternating current electric signal; respectively converting the second reference current, the second input electric signal and the alternating current signal from an abc coordinate system to a dq coordinate system to obtain the second reference current, the second input electric signal and the alternating current signal in the dq coordinate system; performing current closed-loop control on the second reference current, the second input electric signal and the alternating current electric signal in the dq coordinate system to obtain a reference output voltage of the second rectifier in the dq coordinate system; transforming the reference output voltage from a dq coordinate system to an abc coordinate system to obtain the reference output voltage in the abc coordinate system; and according to a sine wave modulation or space vector modulation method, performing pulse generation control on the reference output voltage in an abc coordinate system to obtain a second driving signal, a third driving signal and a fourth driving signal as the second control signal.
In one embodiment, the second reference current is calculated by the following formula:
wherein ia2 *、ib2 *、ic2 *Is the second reference current id *Is the current reference value, va、vb、vcFor said alternating current signal, vamax、vbmax、vcmaxIs the voltage amplitude, i, of the AC signala1、ib1、ic1Is the first input electrical signal.
Drawings
Fig. 1 is a block diagram of a hybrid rectifier according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a basic circuit structure of a hybrid rectifier according to an embodiment of the present invention;
fig. 3 is a block diagram of a high-capacity hybrid rectification charging pile according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for controlling a hybrid rectifier according to an embodiment of the present invention;
FIG. 5 is a control block diagram of a hybrid rectifier according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating a method for acquiring a first control signal according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a first rectifier boost reference current value according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating a method for acquiring a second control signal according to an embodiment of the present invention;
fig. 9 is a diagram illustrating the effect of current simulation waveforms before and after the boost reference current value of the single-switch three-phase boost rectifier is increased by 6 times of the ac circuit component by using the control method according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides a high-capacity hybrid rectification charging pile which comprises a charging pile body and a hybrid rectifier 100 arranged on the charging pile body. Fig. 1 is a block diagram of a Hybrid Rectifier 100 according to an embodiment of the present invention, in which the Hybrid Rectifier 100(Hybrid Rectifier) includes a first Rectifier 110 and a second Rectifier 120, and the first Rectifier 110 is connected in parallel with the second Rectifier 120. The junction of the input of the first rectifier 110 and the input of the second rectifier 120 serves as the input of the hybrid rectifier 100; the junction of the output of the first rectifier 110 and the output of the second rectifier 120 serves as the output of the hybrid rectifier 100. The first Rectifier 110 is a Single Switch Three-Phase Boost Rectifier (SSTPBR), and the second Rectifier 120 is a Virtual Rectifier (VR).
The hybrid rectifier 100 described above combines a single-switch three-phase boost rectifier with a vienna rectifier, which has the advantages of high power factor and low harmonic frequency, so that the hybrid rectifier 100 has the advantages of both the single-switch three-phase boost rectifier and the vienna rectifier. The hybrid rectifier 100 realizes low harmonic and high power factor of the ac current on the premise of realizing stable output of the dc voltage and fast charging, and is a rectifier having high efficiency, high power density, high reliability, high power factor, low cost, and low harmonic rate.
Fig. 2 is a schematic diagram of a basic circuit structure of the hybrid rectifier 100 according to an embodiment of the present invention, in which the hybrid rectifier 100 further includes a first capacitor C1 and a second capacitor C2, and a cathode of the first capacitor C1 is connected to an anode of the second capacitor C2. The first rectifier 110 and the second rectifier 120 are both connected to the first capacitor C1 and the second capacitor C2. The first capacitor C1 and the second capacitor C2 play the same role in the first rectifier 110 circuit and the second rectifier 120 circuit, and are used for buffering the energy exchange between the ac side and the dc load, stabilizing the dc voltage, and suppressing the harmonic voltage on the dc side. The first rectifier 110 and the second rectifier 120 share the first capacitor C1 and the second capacitor C2, which not only simplifies the circuit structure and reduces the components, but also stabilizes the dc voltage of the first rectifier 110 and the second rectifier 120 and suppresses the harmonic voltage on the dc side.
In one embodiment, as shown in the basic circuit schematic diagram of the hybrid rectifier 100 shown in fig. 2, a connection point of the input terminal of the first rectifier 110 and the input terminal of the second rectifier 120 is used as the input terminal of the hybrid rectifier 100, and the input terminal of the hybrid rectifier 100 is connected to a three-phase power source. The three-phase power supply is three-phase symmetrical and comprises a first-phase power supply vaSecond phase power supply vbAnd a third phase supply vc. Three-phase power supply v in the figurea、vb、vcThe signs next to indicate the reference direction of each phase of the three phase power supply. Said three-phase power supply va、vb、vcCorresponding input current, i.e. three-phase current, being ia、ib、icThe three-phase current i in the figurea、ib、icThe side arrows indicate the reference direction of each phase circuit in the three-phase current. In fig. 2, the circuit configuration within a smaller dashed box is the basic circuit configuration of the first rectifier 110. The first rectifier 110 includes a first switching device D1, a second switching device D2, a third switching device D3, a fourth switching device D4, a fifth switching device D5, a sixth switching device D6, and a seventh switching device D4Device VD1And an eighth switching device VD2A ninth switching device Q1, a first inductor Ld1A second inductor Ld2。
The connection relationship of each device in the first rectifier 110 is as follows: the first phase power vaAre respectively connected with the anode of the first switching device D1 and the cathode of the fourth switching device D4, and provide a first phase current i of a first input current to the first rectifier 110a1(ii) a Said second phase power vbA second phase current i connected to the anode of the second switching device D2 and the cathode of the fifth switching device D5, respectively, and providing the first input current to the first rectifier 110b1(ii) a Said third phase supply vcA third phase current i connected to the positive electrode of the third switching device D3 and the negative electrode of the sixth switching device D6, respectively, and providing the first rectifier 110 with the first input currentc1。
The cathodes of the first, second and third switching devices D1, D2, D3 and the first inductor Ld1Is connected to the first inductor Ld1And the other end of the seventh switching device VD1The positive electrode of (1) is connected; the seventh switching device VD1Is connected with the anode of the first capacitor C1; a negative electrode of the second capacitor C2 and the eighth switching device VD2The positive electrode of (1) is connected; the eighth switching device VD2And the second inductor Ld2Is connected to the second inductor Ld2The other end of the first switch is respectively connected with the anodes of the fourth switching device D4, the fifth switching device D5 and the sixth switching device D6; a collector of the ninth switching device Q1 and the seventh switching device VD1The emitter of the ninth switching device Q1 is connected with the eighth switching device VD2Is connected to the negative electrode of (1).
In one embodiment, the first switching device D1, the second switching device D2, the third switching device D3, the fourth switching device D4, the fifth switching device D5, the sixth switching device D6, and the seventh switching device VD1And an eighth switching device VD2All are diodes, and the ninth switching device Q1 is a fully-controlled power switching tube.
Specifically, the three-phase power source is connected to the input terminal of the first rectifier 110, and the three-phase power source is respectively connected to three uncontrolled rectifier bridges formed by a pair of diodes and output to the single-phase boost switching circuit through a boost inductor. Before the ninth switching device Q1 in the single-phase boost switching circuit is turned on, the first inductor Ld1And the second inductance Ld2The current on is zero; after the ninth switching device Q1 is turned on, the uncontrolled rectifier bridge is short-circuited through the ninth switching device Q1, and when the voltage direction of the three-phase power supply is positive, the first inductor Ld1The voltage born by the transformer is the phase voltage of the alternating current input; when the voltage direction of the three-phase power supply is negative, the second inductor Ld2The upper voltage is the phase voltage of the AC input. The first inductor Ld1Or the second inductance Ld2The current in (1) rises from zero, the rate of rise and the peak value of the input current being proportional to the respective phase voltage. After the ninth switching device Q1 is turned off, the three-phase input current will be forced to flow through the switching diodes to output energy to the load; at the same time, the first inductor Ld1Or the second inductance Ld2The stored energy is also released to the load. The first rectifier 110 can realize that the peak value of the input current is in direct proportion to the input phase voltage by only one switch, and the first rectifier 110 has high efficiency, high power density, high reliability and low cost when rectifying the three-phase power supply.
In one embodiment, as shown in the schematic diagram of the basic circuit structure of the hybrid rectifier 100 shown in fig. 2, the circuit structure within the larger dashed box is the basic circuit structure of the second rectifier 120. The second rectifier 120 includes a tenth switching device d1, an eleventh switching device d2, a twelfth switching device d3, a thirteenth switching device d4, a fourteenth switching device d5, a fifteenth switching device d6, a sixteenth switching device d7, a seventeenth switching device d8, an eighteenth switching device d9, a nineteenth switching device d10, a twentieth switching device d11, a twenty-first switching device d12, a twenty-second switching device d8Switching device VDa1And a twentieth switching device VDb1And a twenty-fourth switching device VDc1Twenty-fifth switching device VDa2Twenty sixth switching device VDb2Twenty-seventh switching device VDc2The inductor comprises a twenty-eighth switching device SWa, a twenty-ninth switching device SWb, a thirtieth switching device SWc, a third inductor La, a fourth inductor Lb, a fifth inductor Lc, a first resistor Ra, a second resistor Rb and a third resistor Rc.
The connection relationship of each device in the second rectifier 120 is as follows: the first phase power vaA first phase current i connected to one end of the third inductor La and providing a second input current to the second rectifier 120a2(ii) a The other end of the third inductor La is connected to one end of the first resistor Ra, and the other end of the first resistor Ra is respectively connected to the anode of the tenth switching device d1 and the cathode of the eleventh switching device d 2. Said second phase power vbA second phase current i connected to one end of the fourth inductor Lb and providing a second input current to the second rectifier 120b2The other end of the fourth inductor Lb is connected to one end of the second resistor Rb, and the other end of the second resistor Rb is connected to the anode of the fourteenth switching device d5 and the cathode of the fifteenth switching device d6, respectively. Said third phase supply vcA third phase current i connected to one end of the fifth inductor Lc and providing a second input current to the second rectifier 120c2The other end of the fifth inductor Lc is connected to one end of the third resistor Rc, and the other end of the third resistor Rc is connected to the anode of the eighteenth switching device d9 and the cathode of the nineteenth switching device d10, respectively.
A cathode of the tenth switching device d1, a collector of the twenty-eighth switching device SWa, and a cathode of the twelfth switching device d3 are all connected to the twenty-second switching device VDa1The anode of the eleventh switching device d2, the emitter of the twenty-eighth switching device SWa, and the anode of the thirteenth switching device d4 are all connected with the twenty-fifth switching device VDa2To the negative electrode of saidThe anode of the twelfth switching device d3 and the cathode of the tenth switching device d4 are connected to the cathode of the first capacitor C1.
A cathode of the fourteenth switching device d5, a collector of the twenty-ninth switching device SWb, and a cathode of the sixteenth switching device d7 are all connected to the twenty-third switching device VDb1The anode of the fifteenth switching device d6, the emitter of the twenty-ninth switching device SWb and the seventeenth switching device VDc2And the positive electrode of the second switching device VD is connected with the third switching device VDb2The anode of the sixteenth switching device d7 and the cathode of the seventeenth switching device d8 are connected to the cathode of the first capacitor C1.
A cathode of the eighteenth switching device d9, a collector of the thirtieth switching device SWc, and a cathode of the twentieth switching device d11 are all connected to the twenty-fourth switching device VDc1The anode of the nineteenth switching device d10, the emitter of the thirtieth switching device SWc and the anode of the twenty-first switching device d12 are all connected with the twenty-seventh switching device VDc2The anode of the twentieth switching device d11 and the cathode of the twenty-first switching device d12 are connected to the cathode of the first capacitor C1.
The twenty-second switching device VDa1The twentieth switching device VDb1And a twenty-fourth switching device VDc1The connection point of the negative electrodes in turn serves as the positive electrode of the second rectifier 200 and is connected to the positive electrode of the first capacitor C1. The twenty-fifth switching device VDa2The twenty-sixth switching device VDb2Twenty-seventh switching device VDc2Is connected to the negative electrode of the second rectifier 120, and is connected to the negative electrode of the second capacitor C2.
In one embodiment, the tenth switching device d1, the eleventh switching device d2, the twelfth switching device d3, the thirteenth switching device d4, the fourteenth switching device d5, the fifteenth switching device d6, the sixteenth switching device d7, the seventeenth switching device d8, the eighteenth switching device d7A switching device d9, a nineteenth switching device d10, a twentieth switching device d11, a twenty-first switching device d12, a twenty-second switching device VDa1, a twenty-third switching device VDb1And a twenty-fourth switching device VDc1Twenty-fifth switch VDa2Twenty sixth switching device VDb2And twenty-seventh switching device VDc2Are all diodes; the twenty-eighth switching device SWa, the twenty-ninth switching device SWb and the thirtieth switching device SWc are all full-control power switching tubes.
Specifically, the main circuit of the second rectifier 120 is composed of three boost inductors, three power bridge arms, and two output capacitors on the dc side. The three power bridge arms of the second rectifier 120 are respectively composed of a bidirectional power switch and two diodes, wherein the bidirectional power switch is composed of a fully-controlled power switch tube and a rectifier composed of four diodes. The operation mode of the second rectifier 120 is determined by the input current direction of the ac side during operation. Taking the first phase power supply as an example, when the first phase inputs the current ia2When the twenty-eighth switching device SWa in the first power leg which is positive and connected with the first-phase power supply is closed, current flows into a connection point of the first capacitor C1 and the second capacitor C2 from the third inductor La, the connection point defines a midpoint O, and a current path in the first power leg is a tenth switching device d1, a second eighteen switching device SWa, and a thirteenth switching device d 4. When the first phase input current ia2Positive and disconnected from the eighteenth switching device SWa, a current flows from the third inductor La through the tenth switching device d1 and the twenty-second switching device VDa1Into the first capacitor C1. When the first phase input current ia2When the current is negative and the twenty-eighth switching device SWa is closed, the current flows into the third inductor La from the midpoint O, and the current path in the first power bridge arm is the twelfth switching device d 3-the twenty-eighth switching device SWa-the eleventh switching device d 2. When the first phase input current ia2Is negative and is disconnected from the twenty-eighth switching device SWa, current flows through the second capacitor C2The twenty-fifth switching device VDa2 and the eleventh switching device d2 enter the third inductor La. The working modes of the second power bridge arm and the third power bridge arm are the same as the working mode of the first power bridge arm. The power control of the second rectifier 120 is relatively simple, the input current harmonic and the output voltage ripple performance are excellent, the voltage stress borne by the power device is half of the output direct current voltage, and the output voltage direct connection phenomenon does not exist among the three power bridge arms, so that the second rectifier is suitable for application with high requirements on power density and electric energy quality.
In one embodiment, the hybrid rectifier 100 further includes a fourth resistor RLSaid fourth resistor RLIs connected to the positive electrode of the second rectifier 120, and the fourth resistor RLAnd the other end thereof is connected to the cathode of the second rectifier 120. The fourth resistor RLAs a load resistor, the fourth resistor RLFor receiving energy output by the first rectifier 110 and the second rectifier 120.
Fig. 3 is a block diagram illustrating a structure of a large-capacity hybrid rectification charging pile 10 according to an embodiment of the present invention, where in an embodiment, the large-capacity hybrid rectification charging pile 10 includes a hybrid rectifier 100, a sampling unit 200, and a control unit 300. The hybrid rectifier 100 is the hybrid rectifier 100 in any of the above embodiments. The collecting unit 200 is connected to the hybrid rectifier 100, and is configured to collect a data signal of the hybrid rectifier and transmit the data signal to the control unit 300. The control unit 300 is respectively connected to the acquisition unit 200 and the hybrid rectifier 100, and is configured to output a control signal to the hybrid rectifier 100 according to the received data signal, so as to adjust power distribution in the hybrid rectifier 100. The high-capacity hybrid rectification charging pile based on the SSPBR and VR parallel hybrid rectifier shown in figure 2 has the advantages of SSPBR and VR. On the premise of realizing stable direct-current voltage output and quick charging, low harmonic and unit power factor of alternating current are realized, high efficiency of the charging pile can be realized by regulating power flowing through the SSTPBR and the VR, and the charging pile is suitable for application scenes of large-capacity charging piles.
Although the hybrid rectifier 100 combines the advantages of the two rectifiers SSTPBR and VR, the alternating currents of the SSTPBR are square waves with conduction pi/6 of positive and negative half cycles respectively, and in order to make the current of the charging pile be a perfect sine wave without harmonics, the VR also needs the current to have corresponding sudden changes so as to compensate the sudden changes of the SSTPBR current; therefore, the alternating current of the high-capacity hybrid rectification charging pile has the problem of burrs, so that the quality of electric energy is reduced, and the voltage stress of a power electronic switching device in the high-capacity hybrid rectification charging pile is increased.
In one embodiment, inductance is added on the ac side of the first rectifier 110 of the hybrid rectifier 100. The current abrupt change in the circuit is reduced by using the inductor so as to reduce the burr. However, the problem of power quality by increasing inductance is not enough to increase the circuit production cost, the circuit volume and the weight. Therefore, a method for optimizing the current waveform of the high-capacity hybrid rectification charging pile, improving the quality of electric energy and reducing the voltage stress of the power electronic switch on the premise of not increasing any hardware cost, volume and weight is needed to be found.
Aiming at the problem of the quality of electric energy, meanwhile, in order to improve the control effect on the high-capacity hybrid rectifier charging pile, on one hand, a closed-loop control method with good dynamic performance, strong anti-interference capability and small static error needs to be selected, and on the other hand, the reference current of the high-capacity hybrid rectifier charging pile needs to be controlled. Therefore, the invention provides a control method of a high-capacity hybrid rectification charging pile.
Fig. 4 is a flowchart illustrating a control method of the hybrid rectifier 100 according to an embodiment of the present invention, wherein the control method includes the following steps S100 to S400:
s100: detecting a first input electric signal and a first rectification signal of the first rectifier and a second input electric signal and a second rectification signal of the second rectifier, and acquiring an alternating current electric signal of the three-phase power supply and a current output signal and a voltage output signal of the hybrid rectifier; wherein the alternating current signal is a sum of the first input electrical signal and the second input electrical signal, and the current output signal is a sum of the first rectified signal and the second rectified signal.
S200: a first control signal of the first rectifier is derived from the current output signal and the first input electrical signal.
S300: and acquiring a second control signal of the second rectifier according to the alternating current signal, the voltage output signal, the first input electric signal and the second input electric signal.
S400: transmitting the first control signal to the first rectifier and the second control signal to the second rectifier to regulate power distribution within the hybrid rectifier.
Specifically, the sampling unit 200 samples the hybrid rectifier 100 to obtain data information of the hybrid rectifier 100, where the data signal includes a first input electrical signal and a first rectified signal of the first rectifier 110, a second input electrical signal and a second rectified signal of the second rectifier 120, an ac electrical signal of the three-phase power source, and a current output signal and a voltage output signal of the hybrid rectifier 100. After receiving the data signal, the control unit 300 obtains a first control signal of the first rectifier according to the current output signal and the first input electrical signal; and acquiring a second control signal of the second rectifier according to the alternating current signal, the voltage output signal, the first input electric signal and the second input electric signal. The control unit 300 transmits the first control signal to the first rectifier 110 and transmits the second control signal to the second rectifier 120 to adjust power distribution within the hybrid rectifier 100. Wherein the first input signal is a three-phase input current i of the first rectifier 110a1、ib1、ic1(ii) a The first rectified signal is the output DC signal i of the first rectifier 110dc(ii) a The second input signal is the three-phase input current i of the second rectifier 120a2、ib2、ic2(ii) a The alternating current signal is three-phase voltage v of a three-phase power supplya、vb、vc(ii) a The current output signal is the DC output current i of the hybrid rectifier 100L(ii) a The voltage output signal is the DC output voltage v of the hybrid rectifier 100dc(ii) a The first control signal comprises a first driving signal Q of the first rectifier 1101(ii) a The second control signal comprises a second driving signal SW of the second rectifier 120aA third driving signal SWbA fourth drive signal SWc。
According to the control method of the high-capacity hybrid rectification charging pile, provided by the invention, on the premise of not increasing any hardware cost, volume and weight, the power distribution in the hybrid rectifier 100 is adjusted in a mode of injecting the auxiliary reference current into the reference current, so that the current waveform of the high-capacity hybrid rectification charging pile is optimized, the electric energy quality is improved, and the voltage stress of a power electronic switch is reduced.
Fig. 5 is a control block diagram of a hybrid rectifier according to an embodiment of the present invention, and fig. 5 shows specific processing steps of data signals of the first rectifier 110 and the second rectifier 120 in the control method, and how to obtain the first control signal and the second control signal. The control unit 300 transmits the first control signal and the second control signal to the first rectifier 110 and the second rectifier 120, respectively, to adjust power distribution within the hybrid rectifier 100, thereby optimizing a current waveform of the hybrid rectifier 100.
Fig. 6 is a flowchart of a method for obtaining a first control signal according to an embodiment of the present invention, where in the embodiment, the obtaining the first control signal of the first rectifier according to the output electrical signal and the first input electrical signal includes the following steps S210 to S230:
s210: applying an N-fold frequency alternating current component on the current output signal as a first reference current of the first rectifier; wherein the value of N is 6.
S220: and carrying out current closed-loop control on the first reference current and the first rectification signal to obtain the duty ratio D of the first driving signal.
S230: and according to a sine wave modulation or space vector modulation method, performing pulse control on the duty ratio D to obtain a first driving signal as the first control signal.
Specifically, after the sampling unit 200 collects data information of the hybrid rectifier 100 and transmits the data information to the control unit 300, the control unit 300 obtains a first control signal of the first rectifier 110 according to the data information. Referring to fig. 5, the dc output current i of the hybrid rectifier 100LApplying an N-times frequency AC current component as the first reference current i of the first rectifier 110dc *(ii) a Wherein the value of N is 6. For the first reference current idc *And said first rectified signal idcPerforming current closed-loop control to obtain the first drive signal Q1The duty ratio D of the first drive signal Q1For driving the ninth switching device Q1 to operate. The current closed-loop control can select a control method such as instantaneous value current control or passive control. According to a sine wave modulation or space vector modulation method, performing pulse control on the duty ratio D to obtain the first driving signal Q1The first driving signal Q1Is a first control signal of the first rectifier 110. The control method of the high-capacity hybrid rectification charging pile is a control method of a current reference value introduced for auxiliary current injection, and a 6-frequency-doubled alternating current component is added on the basis of the original direct current reference value of the first rectifier 110, so that the electric energy quality of the high-capacity hybrid rectification charging pile is improved.
In one embodiment, the first reference current idc *The calculation formula of (2) is as follows:
wherein idc *Is the first reference current iLFor the current output signal, ω is angular velocity, t is time, k1、k2Two scaling factors respectively. Specifically, k1iLAdding a 6-fold frequency AC current component to the original DC reference current of the first rectifier 110 to obtain idc *As a first reference current for the first rectifier 110. The phase of the 6 times multiplied alternating current component is pi different from the phase angle of the first phase voltage, which makes the phase of the first rectifier 110 and the phase of the three-phase voltage consistent. FIG. 7 is a diagram of a first rectifier step-up reference current value according to an embodiment of the present invention, wherein vdcsIs the waveform of the output voltage of the three-phase voltage rectified by the hybrid rectifier 100. As can be seen from fig. 7, the first reference current added with the 6-fold frequency ac component effectively suppresses the current glitch caused by the abrupt current change of the first rectifier 110.
Fig. 8 is a flowchart of a method for obtaining a second control signal according to an embodiment of the present invention, where in the obtaining the second control signal of the second rectifier according to the ac electrical signal, the voltage output signal, the first input electrical signal, and the second input electrical signal includes the following steps S310 to S360:
s310: and obtaining a current reference value of the hybrid rectifier through PI control based on a difference value between a voltage reference value of the voltage output signal and the actually measured voltage output signal.
S320: and acquiring a second reference current of the second rectifier according to the current reference value, the first input electric signal and the alternating current electric signal.
S330: and respectively transforming the second reference current, the second input electric signal and the alternating current signal from an abc coordinate system to a dq coordinate system to obtain the second reference current, the second input electric signal and the alternating current signal in the dq coordinate system.
S340: and carrying out current closed-loop control on the second reference current, the second input electric signal and the alternating current electric signal in the dq coordinate system to obtain a reference output voltage of the second rectifier in the dq coordinate system.
S350: and transforming the reference output voltage from a dq coordinate system to an abc coordinate system to acquire the reference output voltage in the abc coordinate system.
S360: and according to a sine wave modulation or space vector modulation method, performing pulse generation control on the reference output voltage in an abc coordinate system to obtain a second driving signal, a third driving signal and a fourth driving signal as the second control signal.
Specifically, after the sampling unit 200 collects data information of the hybrid rectifier 100 and transmits the data information to the control unit 300, the control unit 300 obtains a second control signal of the second rectifier 110 according to the data information. Please refer to FIG. 5, vdc *Is a reference value of the DC output voltage, vdcFor measured DC output voltage, vdc *And vdcThe difference value of the reference voltage of the hybrid rectifier is obtained through PI controld *. Firstly, according to the current reference value id *The first input electrical signal ia1、ib1、ic1And said alternating current signal va、vb、vcObtaining a second reference current i of the second rectifiera2 *、ib2 *、ic2 *. Respectively for the second reference current ia2 *、ib2 *、ic2 *The second input signal ia2、ib2、ic2And said alternating current signal va、vb、vcPerforming transformation from the abc coordinate system to the dq coordinate system to obtain the second reference current i in the dq coordinate systemd2 *、iq2 *The second input signal id2、iq2And said alternating current signal vd、vq. Then, for the second reference current id2 *、iq2 *The second input signal id2、iq2And said alternating current signal vd、vqPerforming current closed-loop control to obtain a reference output voltage v of the second rectifier in dq coordinate systemrdo、vrqo. The current closed-loop control can select a control method such as instantaneous value current control or passive control. Reference output voltage v to the second rectifierrdoConverting the dq coordinate system into the abc coordinate system to obtain the reference output voltage v of the second rectifier under the abc coordinate systemrao、vrbo、vrco. Finally, the reference output voltage v to the second rectifier is modulated according to a sine wave modulation or space vector modulation methodrao、vrbo、vrcoPerforming pulse generation control to obtain the second drive signal SWaThe third driving signal SWbThe fourth drive signal SWc. The second drive signal SWaThe third driving signal SWbThe fourth drive signal SWcThe twenty-eighth switching device SWa, the twenty-ninth switching device SWb and the thirtieth switching device SWc are driven to operate respectively. The second drive signal SWaThe third driving signal SWbThe fourth drive signal SWcIs the second control signal.
In one embodiment, the second reference current ia2 *、ib2 *、ic2 *Is calculated by the formula
Wherein ia2 *、ib2 *、ic2 *Is the second reference current id *Is the current reference value, va、vb、vcFor the alternating current signal, i.e. the system phase voltage, vamax、vbmax、vcmaxIs the voltage amplitude, i, of the AC signala1、ib1、ic1Is the first input electrical signal. V is thena/vamax，vb/vbmaxAnd vc/vcmaxSystem instantaneous ac voltage of unit amplitude respectively, id *×va/vamax，id *×vb/vbmaxAnd id *×vc/vcmaxRespectively, are reference values of the system alternating current. The reference value of the system ac current and the first input current of the first rectifier 110 are combined to be the second reference current of the second rectifier 120, so as to obtain the second control signal of the second rectifier 120 according to the second reference current, and the second input current of the second rectifier 120 and the corresponding current reduction sudden change of the first rectifier 110 can be made to reduce the current glitch, thereby optimizing the current waveform of the hybrid rectifier 100.
Fig. 9 is a diagram illustrating the effect of current simulation waveforms before and after the boost reference current value of the single-switch three-phase boost rectifier is increased by 6 times of the ac circuit component by using the control method according to an embodiment of the present invention. Before the time t-t 3, setting the proportionality coefficient k2 to 0; when t is t3, the proportionality coefficient k2 of the 6-time-multiplication alternating current component relative to the direct current component is changed to be 0.5. As shown in fig. 9, before time t3, the first input current i of the first rectifier 110 is now obtaineda1A current mutation exists for positive and negative half cycles of conducting pi/6 square waves respectively, and the first input current i of the second rectifier 120a2Also having a sudden change, the input current i of the hybrid rectifieraIs a sine wave with burrs. When t is t3, the first input current i of the first rectifier 110 is measureda1Still, the positive and negative half cycles are respectively conducted by pi/6, but the amplitude is a direct current component and the 6-times frequency alternating current component is superposed, so that the sudden change value of the current of the first rectifier 110 becomes smaller, and similarly, the second input current i of the second rectifier 120 is smallera2The abrupt change value of (a) becomes small, and at this time, the input current of the hybrid rectifier is sinusoidal and has no glitch. It can be seen that the large volume provided by the present inventionThe control method of the high-capacity hybrid rectification charging pile can optimize the current waveform of the high-capacity hybrid rectification charging pile by injecting the auxiliary reference current into the reference current on the premise of not increasing any hardware cost, volume and weight, improve the power quality and reduce the voltage stress of the power electronic switch.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A high-capacity hybrid rectification charging pile is characterized by comprising a charging pile body and a hybrid rectifier arranged on the charging pile body, wherein the hybrid rectifier comprises a first rectifier and a second rectifier, and the first rectifier is connected with the second rectifier in parallel; the first rectifier is a single-switch three-phase boost rectifier, and the second rectifier is a Vienna rectifier.
2. The high-capacity hybrid rectifying charging pile according to claim 1, further comprising a first capacitor and a second capacitor, wherein a negative electrode of the first capacitor is connected to a positive electrode of the second capacitor.
3. The high-capacity hybrid rectifying charging pile according to claim 2, wherein the input end of the hybrid rectifier is connected with a three-phase power supply, the three-phase power supply comprises a first-phase power supply, a second-phase power supply and a third-phase power supply, and the first rectifier comprises a first switching device, a second switching device, a third switching device, a fourth switching device, a fifth switching device, a sixth switching device, a seventh switching device, an eighth switching device, a ninth switching device, a first inductor and a second inductor; wherein,
the anode of the first switching device is respectively connected with the first-phase power supply and the cathode of the fourth switching device;
the anode of the second switching device is respectively connected with the second phase power supply and the cathode of the fifth switching device;
the anode of the third switching device is connected with the third phase power supply and the cathode of the sixth switching device respectively;
the cathodes of the first switch device, the second switch device and the third switch device are all connected with one end of the first inductor, and the other end of the first inductor is connected with the anode of the seventh switch device;
the negative electrode of the seventh switching device is connected with the positive electrode of the first capacitor;
the negative electrode of the second capacitor is connected with the positive electrode of the eighth switching device;
the negative electrode of the eighth switching device is connected with one end of the second inductor, and the other end of the second inductor is respectively connected with the positive electrodes of the fourth switching device, the fifth switching device and the sixth switching device;
a collector of the ninth switching device is connected to an anode of the seventh switching device, and an emitter of the ninth switching device is connected to a cathode of the eighth switching device.
4. The high-capacity hybrid rectification charging pile according to claim 3, wherein the second rectifier comprises a tenth switching device, an eleventh switching device, a twelfth switching device, a tenth switching device, a fourteenth switching device, a fifteenth switching device, a sixteenth switching device, a seventeenth switching device, an eighteenth switching device, a nineteenth switching device, a twentieth switching device, a twenty-first switching device, a twenty-second switching device, a twentieth switching device, a twenty-fourteenth switching device, a twenty-fifth switching device, a twenty-sixth switching device, a twenty-seventh switching device, a twenty-eighteenth switching device, a twenty-ninth switching device, a thirty-third switching device, a third inductor, a fourth inductor, a fifth inductor, a first resistor, a second resistor and a third resistor; wherein,
one end of the third inductor is connected with the first-phase power supply, the other end of the third inductor is connected with one end of the first resistor, and the other end of the first resistor is respectively connected with the anode of the tenth switching device and the cathode of the eleventh switching device;
one end of the fourth inductor is connected with the second-phase power supply, the other end of the fourth inductor is connected with one end of the second resistor, and the other end of the second resistor is respectively connected with the anode of the fourteenth switching device and the cathode of the fifteenth switching device;
one end of the fifth inductor is connected with the third phase power supply, the other end of the fifth inductor is connected with one end of the third resistor, and the other end of the third resistor is respectively connected with the anode of the eighteenth switching device and the cathode of the nineteenth switching device;
a cathode of the tenth switching device, a collector of the twenty-eighth switching device and a cathode of the twelfth switching device are all connected with an anode of the twenty-second switching device, an anode of the eleventh switching device, an emitter of the twenty-eighth switching device and an anode of the tenth switching device are all connected with a cathode of the twenty-fifth switching device, and an anode of the twelfth switching device and a cathode of the tenth switching device are connected with a cathode of the first capacitor;
a cathode of the fourteenth switching device, a collector of the twenty-ninth switching device and a cathode of the sixteenth switching device are all connected with an anode of the twentieth switching device, an anode of the fifteenth switching device, an emitter of the twenty-ninth switching device and an anode of the seventeenth switching device are all connected with a cathode of the twenty-sixth switching device, and an anode of the sixteenth switching device and a cathode of the seventeenth switching device are connected with a cathode of the first capacitor;
a cathode of the eighteenth switching device, a collector of the thirtieth switching device and a cathode of the twentieth switching device are all connected with an anode of the twenty-fourth switching device, an anode of the nineteenth switching device, an emitter of the thirtieth switching device and an anode of the twenty-first switching device are all connected with a cathode of the twenty-seventh switching device, and an anode of the twentieth switching device and a cathode of the twenty-first switching device are connected with a cathode of the first capacitor;
the connection point of the cathodes of the twenty-second switching device, the twenty-fourth switching device and the twenty-second switching device which are sequentially connected serves as the anode of the second rectifier and is connected with the anode of the first capacitor;
and the connecting points of the anodes of the twenty-fifth switching device, the twenty-sixth switching device and the twenty-seventh switching device which are sequentially connected are used as the cathode of the second rectifier and are connected with the cathode of the second capacitor.
5. The high-capacity hybrid rectifying charging pile according to claim 4, wherein the first switching device, the second switching device, the third switching device, the fourth switching device, the fifth switching device, the sixth switching device, the seventh switching device, the eighth switching device, the tenth switching device, the eleventh switching device, the twelfth switching device, the tenth switching device, the fourteenth switching device, the fifteenth switching device, the sixteenth switching device, the seventeenth switching device, the eighteenth switching device, the nineteenth switching device, the twentieth switching device, the twenty-first switching device, the twenty-second switching device, the twenty-third switching device, the twenty-fourteenth switching device, the twenty-fifth switching device, the twenty-sixth switching device and the twenty-seventh switching device are diodes;
and the ninth switching device, the twenty-eighth switching device, the twenty-ninth switching device and the thirty-eighth switching device are all full-control power switching tubes.
6. A control method for a high-capacity hybrid rectification charging pile is characterized in that the high-capacity hybrid rectification charging pile comprises a hybrid rectifier, the input end of the hybrid rectifier is connected with a three-phase power supply, the hybrid rectifier comprises a first rectifier and a second rectifier, and the control method comprises the following steps:
detecting a first input electric signal and a first rectification signal of the first rectifier and a second input electric signal and a second rectification signal of the second rectifier, and acquiring an alternating current electric signal of the three-phase power supply and a current output signal and a voltage output signal of the hybrid rectifier; wherein the alternating current electrical signal is a sum of the first input electrical signal and the second input electrical signal, and the current output signal is a sum of the first rectified signal and the second rectified signal;
acquiring a first control signal of the first rectifier according to the current output signal and the first input electric signal;
acquiring a second control signal of the second rectifier according to the alternating current signal, the voltage output signal, the first input electrical signal and the second input electrical signal;
transmitting the first control signal to the first rectifier and the second control signal to the second rectifier to regulate power distribution within the hybrid rectifier.
7. The control method of claim 6, wherein said deriving a first control signal for the first rectifier from the output electrical signal and the first input electrical signal comprises:
applying an N-fold frequency alternating current component on the current output signal as a first reference current of the first rectifier; wherein the value of N is 6;
carrying out current closed-loop control on the first reference current and the first rectification signal to obtain a duty ratio D of a first driving signal;
and according to a sine wave modulation or space vector modulation method, performing pulse control on the duty ratio D to obtain a first driving signal as the first control signal.
8. The control method according to claim 7, wherein the first reference current is calculated by the formula:
wherein idc *Is the first reference current iLFor the current output signal, ω is angular velocity, t is time, k1、k2Two scaling factors respectively.
9. The control method of claim 8, wherein said deriving a second control signal for the second rectifier from the alternating current signal, the voltage output signal, the first input electrical signal, and the second input electrical signal comprises:
obtaining a current reference value of the hybrid rectifier through PI control based on a difference value between a voltage reference value of the voltage output signal and the actually measured voltage output signal;
acquiring a second reference current of the second rectifier according to the current reference value, the first input electric signal and the alternating current electric signal;
respectively converting the second reference current, the second input electric signal and the alternating current signal from an abc coordinate system to a dq coordinate system to obtain the second reference current, the second input electric signal and the alternating current signal in the dq coordinate system;
performing current closed-loop control on the second reference current, the second input electric signal and the alternating current electric signal in the dq coordinate system to obtain a reference output voltage of the second rectifier in the dq coordinate system;
transforming the reference output voltage from a dq coordinate system to an abc coordinate system to obtain the reference output voltage in the abc coordinate system;
and according to a sine wave modulation or space vector modulation method, performing pulse generation control on the reference output voltage in an abc coordinate system to obtain a second driving signal, a third driving signal and a fourth driving signal as the second control signal.
10. The control method according to claim 9, wherein the second reference current is calculated by the formula:
wherein ia2 *、ib2 *、ic2 *Is the second reference current id *Is the current reference value, va、vb、vcFor said alternating current signal, vamax、vbmax、vcmaxIs the voltage amplitude, i, of the AC signala1、ib1、ic1Is the first input electrical signal.
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