CN117134644A - Control method of bidirectional ac/dc converter compatible with single/three-phase operation in single-phase inversion mode - Google Patents

Control method of bidirectional ac/dc converter compatible with single/three-phase operation in single-phase inversion mode Download PDF

Info

Publication number
CN117134644A
CN117134644A CN202311124116.1A CN202311124116A CN117134644A CN 117134644 A CN117134644 A CN 117134644A CN 202311124116 A CN202311124116 A CN 202311124116A CN 117134644 A CN117134644 A CN 117134644A
Authority
CN
China
Prior art keywords
phase
voltage
current
value
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311124116.1A
Other languages
Chinese (zh)
Inventor
李贺龙
陈鹏
苑梓恒
吴周宇
杨之青
赵爽
于子翔
丁立健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hefei University of Technology
Original Assignee
Hefei University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hefei University of Technology filed Critical Hefei University of Technology
Priority to CN202311124116.1A priority Critical patent/CN117134644A/en
Publication of CN117134644A publication Critical patent/CN117134644A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
    • 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
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac 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
    • H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current

Abstract

The invention discloses a control method of a bidirectional ac/dc converter compatible with single/three-phase operation in a single-phase inversion mode, which comprises the following steps: 1. the invention discloses a three-phase four-wire system converter with a split capacitor, which comprises a three-phase active bridge arm formed by a power device and an N-phase passive bridge arm formed by the split capacitor, wherein under a single-phase inversion mode, an A phase and a B phase are connected in parallel through a relay, a C phase and the N phase are connected in parallel through the relay to form single-phase inversion output, 3, three-ring control of a voltage effective value outer ring, a voltage instantaneous value inner ring and a current instantaneous value inner ring is adopted for the A phase and the B phase, an alternating current output voltage is regulated, independent current ring control is adopted for the C phase, and C, N interphase current stress is regulated.

Description

Control method of bidirectional ac/dc converter compatible with single/three-phase operation in single-phase inversion mode
Technical Field
The invention belongs to the field of control of three-phase four-wire inverter systems, and particularly relates to a control method of a bidirectional ac/dc converter compatible with single/three-phase operation in a single-phase inversion mode.
Background
An on-board charger (OBC) provides the ability to charge an electric car battery directly from the ac power grid, typically operating in grid-to-vehicle (G2V) mode. In addition, the OBC may also operate in a vehicle-to-home (V2H) or vehicle-to-load (V2L) mode as an inverter to provide power. With the increasing popularity of electric vehicles, there is an increasing interest in V2X (V2G, V2L, V H or V2V) mode operation, and thus bi-directional power transfer capability is more important to OBCs.
OBCs are generally classified into two-stage and single-stage configurations, and most industrial electric vehicles employ two-stage OBC configurations. The structure of the two-stage OBC is composed of a bi-directional ac/dc converter and an isolated dc/dc converter. With the increasing demand for fast charging and V2X services, higher power bi-directional ac/dc converters are critical to OBC. As one of potential candidates, three-phase (3-ph) bridge converters are widely used due to their simple structure and mature control schemes. To facilitate interconnection with various grid and load conditions, ac/dc converters also require single phase (1-ph) operation. Thus, bi-directional ac/dc converters capable of 3-ph and 1-ph compatible operation are becoming the first choice for OBC.
Typically a 3-ph bi-directional ac/dc converter can easily achieve single phase operation with a partial branch, but since the devices of the converter stage of each phase are designed according to their three phase power rating, the 1-ph output power is limited to 1/3 of the three phase power rating. For this problem, various solutions are mentioned in many academic papers, such as: "Three-phase 11kW on-board charger with single-phase reverse function", "Mun, choi S W, hong D Y, et al Journal ofPower Electronics 22.8.8 (2022): 1255-1264) proposes an over-design of the inverter stage device such that the single phase output power is increased to 1/2 of the Three phase rated power, but this will result in an increase in the volume of the on-board charger and an increase in cost. There is also a proposal to add an extra set of legs to form a three-phase four-wire four-leg converter to increase the rated power of the single-phase output, but this also increases the cost.
Disclosure of Invention
In order to overcome the limitation of the technical scheme, the invention provides a control method of a bidirectional ac/dc converter compatible with single/three-phase operation in a single-phase inversion mode based on a split capacitor type three-phase four-wire system inverter, so that the single-phase output power can be improved to 1/2 of the three-phase rated power on the premise of not adding additional devices and over-designing, and the power level of single-phase output is improved on the basis of ensuring the stability of alternating-current voltage.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention relates to a control method of a bidirectional ac/dc converter compatible with single/three-phase operation in a single-phase inversion mode, which is characterized by comprising the following steps:
step 1, in a single-phase inversion mode, the A phase and the B phase in the topological structure of the bidirectional ac/dc converter are connected in parallel, and the C phase and the N phase are connected in parallel;
step 2, adopting a three-loop control strategy of a voltage effective value, an instantaneous value and a current instantaneous value to regulate A-phase and B-phase output alternating current voltages of the bidirectional ac/dc inverter, and obtaining A-phase and B-phase control signals;
step 3, adopting an independent alternating current loop control strategy to regulate the current stress between the C phase and the N phase of the bidirectional ac/dc converter to obtain a C phase control signal;
and 4, inputting control signals of the A phase, the B phase and the C phase into a pulse width modulator to generate PWM pulse signals for controlling the on and off of a power device in the bidirectional ac/dc converter, thereby realizing the control of the output alternating voltage of the bidirectional ac/dc converter and the current stress between the C phase and the N phase.
The single-phase control method of the three-phase four-wire system inverter is also characterized in that the A-phase and B-phase output alternating voltages in the step 2 are regulated according to the following process:
step 2.1: collecting A-phase voltage of filter capacitor C at alternating current side in the bidirectional ac/dc converter
Step 2.2: a phase voltage of a filter capacitor C on alternating current sideCalculating effective value RMS to obtain effective value +.A-phase voltage of AC side filter capacitor C>
Step 2.3: reference value of effective value of A phase target voltageEffective value of phase A voltage->After the difference is made, an A phase error value is obtained, and proportional integral control is carried out on the A phase error value, so that an A phase output voltage amplitude reference value is obtained;
step 2.4: multiplying the amplitude reference value of the A-phase output voltage with sin (ωt) to obtain the A-phase voltageInner loop reference value of instantaneous valueInner loop reference value for instantaneous value of phase A voltage +.>Feedback value instantaneous with phase A voltage +.>After the difference is made, an A-phase voltage difference value is obtained, and proportional resonance control is carried out on the A-phase voltage difference value, so that an A-phase inductance current reference value is obtained, wherein ω represents the controlled output voltage angular frequency, ω=2pi f represents the controlled output voltage frequency;
step 2.5: the reference value of the A-phase inductor current and the instantaneous value of the A-phase inductor current are combinedAfter the difference is made, the obtained difference value is subjected to proportional resonance control, and an A-phase modulation signal is obtained;
step 2.6: the A-phase modulation signal is input into a PWM modulator to obtain an inverter A-phase control signal by using the formula (1)A-phase voltage for a filter capacitor C on the AC side>And (3) performing control:
in the formula (1), s is Laplacian, G DVC (s) is a voltage effective value PI controller, andwherein (1)>For the adjustment factor of the ratio P, +.>For integrating the adjustment coefficient of I, G AVC (s) an inner loop PR controller representing the instantaneous value of the voltage, and +>Wherein (1)>For the adjustment factor of the voltage inner loop ratio P, +.>For the adjustment coefficient, ω, of the voltage transient internal loop resonance R g Rated angular frequency for grid voltage; g ACC (s) is a current loop PR controller, and +.>Wherein,for the adjustment factor of the current loop ratio P, +.>Is the tuning coefficient of the current loop resonance R.
The alternating current loop control strategy in the step 3 is carried out according to the following process:
step 3.1: collecting inductance currents of A phase, B phase and C phase of side inductance L in bidirectional ac/dc converter
Step 3.2: inductive current to phase A and phase BAfter addition and inversion, the current distribution coefficient k is multiplied to obtain C phaseInductor current->Reference value of +.>
Step 3.3: inductance current of C phaseReference value of +.>Instantaneous feedback value of inductor current with phase C +.>After the difference is made, the obtained C-phase error value is subjected to proportional resonance control, so that a C-phase control signal in the bidirectional ac/dc inverter is obtained by using a formula (2)>
In the formula (2), s is Laplacian, G' ACC (s) is a C-phase current loop PR controller, and wherein (1)>For the regulation factor of the C-phase current loop ratio P, < >>R regulation factor for C-phase current loop resonance, < >>Is the rated angular frequency of the grid voltage.
The electronic device of the present invention includes a memory for storing a program supporting the processor to execute the control method, and a processor configured to execute the program stored in the memory.
The invention relates to a computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, performs the steps of the control method.
Compared with the prior art, the invention has the following beneficial effects:
1. the control method provided by the invention can flexibly distribute the C-phase current and the N-phase current by setting the corresponding current distribution coefficients, so that the split capacitor plays a role of a fourth bridge arm, and in a single-phase mode, the parallel output of each two bridge arms can be realized, so that the single-phase output power is improved to 1/2 of the three-phase rated power under the condition of not increasing extra device cost, and the advantage of lower cost of the split capacitor type three-phase four-wire inverter is more highlighted compared with a corresponding three-phase four-bridge arm inverter.
2. Aiming at the single-phase control problem of the split capacitor type three-phase four-wire system inverter, the invention is different from the existing pure voltage ring control, adopts three rings of voltage effective value, instantaneous value and current instantaneous value to control the switching device of the A/B phase, adopts an instantaneous current ring to control the switching device of the C phase, and can adjust the current stress between the C phase and the N phase while adjusting the alternating current output voltage.
Drawings
FIG. 1 is a topology diagram of a three-phase four-wire inverter employed in the practice of the present invention during single-phase operation;
FIG. 2 is a block diagram of a control architecture for controlling a three-phase four-wire inverter employed in the practice of the present invention in single-phase operation;
FIG. 3 shows the use of the present inventionOpen control method, three-phase four-wire system inverter at power level S n Voltage current waveform at=6.6kw, k=1/2.
FIG. 4 shows a three-phase four-wire inverter at power level S using the control method of the present invention n Voltage current waveform plot when=6.6kw, k=1/3.
Detailed Description
The following describes the embodiments and working principles of the present invention in further detail with reference to the drawings.
In the embodiment, the control method of the bidirectional ac/dc converter compatible with single/three-phase operation in the single-phase inversion mode considers that the bidirectional vehicle-mounted charger works in the V2L mode, and the vehicle-mounted charger (OBC) with the split capacitive three-phase four-wire system inverter at the front stage can serve as a three-phase 380V power grid for supplying power to a load and a single-phase 220V power grid for supplying power to the load, and simultaneously considers the current sharing problem between a C-phase active bridge arm and an N-phase capacitive passive bridge arm.
The topology structure adopted in the embodiment is shown in fig. 1, and the topology structure is a three-phase four-wire system inverter with split capacitors and comprises a three-phase full-bridge inverter, an alternating current side inductor L and an alternating current side filter capacitor C. In this example, l=300uh and c=10uf.
The single-phase control method of the three-phase four-wire system inverter is that the topological structure of the split capacitor type three-phase four-wire system inverter is used for parallelly connecting the A phase and the B phase, the C phase and the N phase are parallelly connected to form single-phase output, three-loop control is adopted for the A phase and the B phase by adopting voltage effective values, instantaneous values and current instantaneous values, alternating-current voltage is regulated, alternating-current loop control is adopted for the C phase, current between the C phase and the N phase is regulated, and a three-phase control signal is obtained and then is input into a pulse width modulator, so that PWM switching signals for controlling the on and off of a power device in the inverter are generated, and single-phase control of the inverter is realized.
In specific implementation, the control structure block diagram of the control method is shown in fig. 2, and the specific control process is as follows:
step 1, in a single-phase inversion mode, the A phase and the B phase in the topological structure of the bidirectional ac/dc converter are connected in parallel, and the C phase and the N phase are connected in parallel;
step 2, adopting a three-loop control strategy of a voltage effective value, an instantaneous value and a current instantaneous value to regulate A-phase and B-phase output alternating current voltages of the bidirectional ac/dc inverter, and obtaining A-phase and B-phase control signals;
step 2.1: collecting A-phase voltage of filter capacitor C at alternating current side in the bidirectional ac/dc converter
Step 2.2: a phase voltage of a filter capacitor C on alternating current sideCalculating effective value RMS to obtain effective value +.A-phase voltage of AC side filter capacitor C>
Step 2.3: reference value of effective value of A phase target voltageEffective value of phase A voltage->After the difference is made, an A phase error value is obtained, and proportional integral control is carried out on the A phase error value, so that an A phase output voltage amplitude reference value is obtained;
step 2.4: multiplying the amplitude reference value of the A-phase output voltage with sin (ωt) to obtain the inner loop reference value of the A-phase voltage instantaneous valueInner loop reference value for instantaneous value of phase A voltage +.>Feedback value instantaneous with phase A voltage +.>After the difference is made, an A-phase voltage difference value is obtained, and proportional resonance control is carried out on the A-phase voltage difference value, so that an A-phase inductance current reference value is obtained, wherein ω represents the controlled output voltage angular frequency, ω=2pi f represents the controlled output voltage frequency;
step 2.5: the reference value of the A-phase inductor current and the instantaneous value of the A-phase inductor current are combinedAfter the difference is made, the obtained difference value is subjected to proportional resonance control, and an A-phase modulation signal is obtained;
step 2.6: the A-phase modulation signal is input into a PWM modulator to obtain an inverter A-phase control signal by using the formula (1)A-phase voltage for a filter capacitor C on the AC side>And (3) performing control:
in the formula (1), s is Laplacian, G DVC (s) is a voltage effective value PI controller, andwherein (1)>For the adjustment factor of the ratio P, +.>For integrating the adjustment coefficient of I, G AVC (s) an inner loop PR controller representing the instantaneous value of the voltage, and +>Wherein,for the adjustment factor of the voltage inner loop ratio P, +.>For the adjustment coefficient, ω, of the voltage transient internal loop resonance R g Rated angular frequency for grid voltage; g ACC (s) is a current loop PR controller, and +.>Wherein (1)>For the adjustment factor of the current loop ratio P, +.>Is the tuning coefficient of the current loop resonance R.
Step 3, adopting an independent alternating current loop control strategy to regulate the current stress between the C phase and the N phase of the bidirectional ac/dc converter to obtain a C phase control signal;
step 3.1: collecting inductance currents of A phase, B phase and C phase of side inductance L in bidirectional ac/dc converter
Step 3.2: inductive current to phase A and phase BAfter addition and inversion, the current distribution coefficient k is multiplied to obtain C-phase inductance current +.>Reference value of +.>
Step 3.3: inductance current of C phaseReference value of +.>Instantaneous feedback value of inductor current with phase C +.>After the difference is made, the obtained C-phase error value is subjected to proportional resonance control, so that a C-phase control signal in the bidirectional ac/dc inverter is obtained by using a formula (2)>
In the formula (2), s is Laplacian, G' ACC (s) is a C-phase current loop PR controller, and wherein (1)>For the regulation factor of the C-phase current loop ratio P, < >>R regulation factor for C-phase current loop resonance, < >>Is the rated angular frequency of the grid voltage.
In the specific implementation, the control parameters of the AC voltage effective value outer ring PI controller, the AC voltage instantaneous value PR controller and the AC current ring PR controller are based on the system parameters and the rated capacity S of the inverter n Is arranged. The implementation isIn the example, S n ＝6.6kw。
And 4, inputting control signals of the A phase, the B phase and the C phase into a pulse width modulator to generate PWM pulse signals for controlling the on and off of a power device in the bidirectional ac/dc converter, thereby realizing the control of the output alternating voltage of the bidirectional ac/dc converter and the current stress between the C phase and the N phase.
In order to verify the effectiveness of the control method, a corresponding simulation model is built through power electronic simulation software placs, and simulation results are shown in fig. 3 and fig. 4.
FIG. 3 shows a three-phase four-wire inverter at power level S using the control method of the present invention n Output voltage at current distribution coefficient k=1/2=6.6 kwC-phase current i c Current i of N phase n Waveform diagram. As shown in fig. 3: by adopting the control method of the invention, the output voltage is +.>And (2) target voltage->Consistent C phase current i c Current i of N phase n Can realize current sharing control, i c ＝i n And the power supply is approximately equal to 15A, and meets national standard GB/T40432-2021 on-vehicle conduction charger for electric vehicles, so that the single-phase output power is improved to 1/2 of the three-phase rated power under the condition of not increasing extra device cost and over-design of devices.
To further verify the versatility of the control method of the present invention, consider the current distribution coefficient k=1/3, i.e. n ＝2i c In this case.
FIG. 4 shows a three-phase four-wire inverter at power level S using the control method of the present invention n Output voltage at current distribution coefficient k=1/3=6.6 kwC-phase current i c Current i of N phase n Waveform diagram. As shown in fig. 4: by adopting the control method of the invention, the output voltage is +.>And (2) target voltage->Consistent N-phase current i n Is C phase current i c Twice as many as (x).
In this embodiment, an electronic apparatus includes a memory for storing a program for supporting the processor to execute the above-described single-phase control method, and a processor configured to execute the program stored in the memory.
In this embodiment, a computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the single-phase control method described above.
In summary, the control method not only can realize stable output voltage, but also can flexibly distribute C-phase and N-phase currents by setting the current distribution coefficient, thereby avoiding overcurrent, and when the value of the current distribution coefficient k is 1/2, the single-phase output power can be improved to 1/2 of the rated output power of three phases without adding extra devices and elements for over-designing.

Claims (5)

1. A method for controlling a bi-directional ac/dc converter compatible with single/three phase operation in a single phase inversion mode, comprising the steps of:
step 1, in a single-phase inversion mode, the A phase and the B phase in the topological structure of the bidirectional ac/dc converter are connected in parallel, and the C phase and the N phase are connected in parallel;
step 2, adopting a three-loop control strategy of a voltage effective value, an instantaneous value and a current instantaneous value to regulate A-phase and B-phase output alternating current voltages of the bidirectional ac/dc inverter, and obtaining A-phase and B-phase control signals;
step 3, adopting an independent alternating current loop control strategy to regulate the current stress between the C phase and the N phase of the bidirectional ac/dc converter to obtain a C phase control signal;
and 4, inputting control signals of the A phase, the B phase and the C phase into a pulse width modulator to generate PWM pulse signals for controlling the on and off of a power device in the bidirectional ac/dc converter, thereby realizing the control of the output alternating voltage of the bidirectional ac/dc converter and the current stress between the C phase and the N phase.
2. The method for single-phase control of a three-phase four-wire inverter according to claim 1, wherein the a-phase and B-phase output ac voltages in step 2 are adjusted as follows:
step 2.1: collecting A-phase voltage of filter capacitor C at alternating current side in the bidirectional ac/dc converter
Step 2.2: a phase voltage of a filter capacitor C on alternating current sideCalculating effective value RMS to obtain effective value +.A-phase voltage of AC side filter capacitor C>
Step 2.3: reference value of effective value of A phase target voltageEffective value of phase A voltage->After the difference is made, an A phase error value is obtained, and proportional integral control is carried out on the A phase error value, so that an A phase output voltage amplitude reference value is obtained;
step 2.4: amplitude reference value s of A-phase output voltageAfter in (ωt) multiplication, an inner loop reference value of the A phase voltage instantaneous value is obtainedInner loop reference value for instantaneous value of phase A voltage +.>Feedback value instantaneous with phase A voltage +.>After the difference is made, an A-phase voltage difference value is obtained, and proportional resonance control is carried out on the A-phase voltage difference value, so that an A-phase inductance current reference value is obtained, wherein ω represents the controlled output voltage angular frequency, ω=2pi f represents the controlled output voltage frequency;
step 2.5: the reference value of the A-phase inductor current and the instantaneous value of the A-phase inductor current are combinedAfter the difference is made, the obtained difference value is subjected to proportional resonance control, and an A-phase modulation signal is obtained;
step 2.6: the A-phase modulation signal is input into a PWM modulator to obtain an inverter A-phase control signal by using the formula (1)A-phase voltage for a filter capacitor C on the AC side>And (3) performing control:
in the formula (1), s is Laplacian, G DVC (s) is a voltage effective value PI controller, andwherein (1)>For the adjustment factor of the ratio P, +.>For integrating the adjustment coefficient of I, G AVC (s) an inner loop PR controller representing the instantaneous value of the voltage, and +>Wherein (1)>For the adjustment factor of the voltage inner loop ratio P, +.>For the adjustment coefficient, ω, of the voltage transient internal loop resonance R g Rated angular frequency for grid voltage; g ACC (s) is a current loop PR controller, and +.>Wherein,for the adjustment factor of the current loop ratio P, +.>Is the tuning coefficient of the current loop resonance R.
3. The method for single-phase control of a three-phase four-wire inverter according to claim 1, wherein the ac current loop control strategy in step 3 is performed as follows:
step 3.1: collecting inductance currents of A phase, B phase and C phase of side inductance L in bidirectional ac/dc converter
Step 3.2: inductive current to phase A and phase BAfter addition and inversion, the current distribution coefficient k is multiplied to obtain C-phase inductance currentReference value of +.>
Step 3.3: inductance current of C phaseReference value of +.>Instantaneous feedback value of inductor current with phase C +.>After the difference is made, the obtained C-phase error value is subjected to proportional resonance control, so that a C-phase control signal in the bidirectional ac/dc inverter is obtained by using a formula (2)>
In the formula (2), s is Laplacian, G' ACC (s) is a C-phase current loop PR controller, and wherein (1)>For the regulation factor of the C-phase current loop ratio P, < >>R regulation factor for C-phase current loop resonance, < >>Is the rated angular frequency of the grid voltage.
4. An electronic device comprising a memory and a processor, characterized in that the memory is for storing a program supporting the processor to execute the control method of any one of claims 1-3, the processor being configured for executing the program stored in the memory.
5. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, performs the steps of the control method according to any one of claims 1-3.
CN202311124116.1A 2023-09-01 2023-09-01 Control method of bidirectional ac/dc converter compatible with single/three-phase operation in single-phase inversion mode Pending CN117134644A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311124116.1A CN117134644A (en) 2023-09-01 2023-09-01 Control method of bidirectional ac/dc converter compatible with single/three-phase operation in single-phase inversion mode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311124116.1A CN117134644A (en) 2023-09-01 2023-09-01 Control method of bidirectional ac/dc converter compatible with single/three-phase operation in single-phase inversion mode

Publications (1)

Publication Number Publication Date
CN117134644A true CN117134644A (en) 2023-11-28

Family

ID=88850643

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311124116.1A Pending CN117134644A (en) 2023-09-01 2023-09-01 Control method of bidirectional ac/dc converter compatible with single/three-phase operation in single-phase inversion mode

Country Status (1)

Country Link
CN (1) CN117134644A (en)

Similar Documents

Publication Publication Date Title
CN108493967B (en) Voltage balance control method of microgrid inverter under unbalanced load condition
CN103036236B (en) Control method of wide frequency range multi-type harmonic comprehensive governance system
CN111917119B (en) Solid-state transformer for restraining voltage fluctuation of multi-stage capacitor and control method and equipment
Mortezaei et al. A bidirectional NPC-based level 3 EV charging system with added active filter functionality in smart grid applications
Vardani et al. A single-stage bidirectional inductive power transfer system with closed-loop current control strategy
CN106559006A (en) Two-way AC-DC converter
CN104868762A (en) DES (distributed energy storage) power electronic transformer, and control method therefor
CN110323780A (en) A kind of cluster improvement of damping resonance suppressing method of island UPS multi-machine parallel connection system
CN110663163B (en) Method for controlling a three-phase Vienna rectifier
Nguyen et al. Enhanced performance of charging stations via converter control under unbalanced and harmonic distorted grids
Sinjari et al. Electric vehicle charging with reactive power compensation to distribution systems
CN114123203A (en) Direct-current bus voltage ripple suppression strategy during voltage unbalance of alternating-current power grid
Mittal et al. EV Control in G2V and V2G modes using SOGI Controller
Jeong et al. Controller design for a quick charger system suitable for electric vehicles
Wang et al. Grid-Tied single-phase Bi-directional PEV charging/discharging control
CN109690929B (en) Control method and control device of power factor correction circuit and vehicle
CN117134644A (en) Control method of bidirectional ac/dc converter compatible with single/three-phase operation in single-phase inversion mode
Dwivedi et al. Three-phase AC/DC converter fed two parallel interleaved DC-DC converters for fast charging applications with improved power quality
CN102611109B (en) Method for controlling LC (inductance and capacitance) hybrid active power filter with two switch arms
CN111181365A (en) Filtering method and device of twelve-pulse-wave rectifier transformer
CH711566A2 (en) Inverter for exchanging electrical energy between a DC system and an AC system.
CN114094601B (en) Alternating-current voltage fluctuation control method for isolated network operation of direct-current power distribution network
Zhao et al. A high power density 3-phase/1-phase compatible misn-pfc converter for on-board charger
Forato et al. Dynamic EV charging WPT system control based on Modulated Variable Laplace Transform
Bharat et al. THD analysis and small AC signal analysis of trans-Z-source and quasi-Z-source inverter for linear and non-linear load

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination