CN107994777A - A kind of CLLLC types bidirectional DC-DC converter method for controlling frequency conversion - Google Patents
A kind of CLLLC types bidirectional DC-DC converter method for controlling frequency conversion Download PDFInfo
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- CN107994777A CN107994777A CN201711302122.6A CN201711302122A CN107994777A CN 107994777 A CN107994777 A CN 107994777A CN 201711302122 A CN201711302122 A CN 201711302122A CN 107994777 A CN107994777 A CN 107994777A
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 18
- 230000002457 bidirectional effect Effects 0.000 title claims description 23
- 238000012546 transfer Methods 0.000 claims description 29
- 230000003750 conditioning effect Effects 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000006641 stabilisation Effects 0.000 abstract description 2
- 238000011105 stabilization Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000010363 phase shift Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 241000290509 Acrossus Species 0.000 description 1
- 101100001677 Emericella variicolor andL gene Proteins 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A kind of two-way DC DC converter method for controlling frequency conversion of CLLLC types is the input using given voltage and the difference of actual output voltage as modulate circuit, input of the output of modulate circuit as compensating controller, input of the output of compensator as voltage controlled oscillator, input of the output of voltage controlled oscillator as switching tube, error voltage signal is converted into frequency signal by voltage controlled oscillator, frequency signal is converted into corresponding drive waveforms, driving switch pipe again.During present method solves using opened loop control and tradition phase-shifting control method, the two-way DC DC converters of CLLLC types are when being subject to voltage or load disturbance, the problem of cannot keeping output voltage stabilization, this method is enabled a system in wider frequency ranges of operation, with higher steady state controling precision, preferable dynamic responding speed, further increases power transmission efficiency.
Description
Technical Field
The invention relates to a control method of a bidirectional DC-DC converter, in particular to a frequency conversion control method of a CLLLC type bidirectional DC-DC converter.
Background
In recent years, countries around the world propose renewable energy development as a development strategy, and bidirectional DC-DC converters are increasingly widely researched as a key link of energy conversion.
The common control methods of the bidirectional DC-DC converter comprise open-loop control, phase-shifting control and the like, the open-loop control method is simple and easy to realize, for example, in the open document 1, the analysis and design of a bidirectional CLLLC resonant direct current transformer [ J ]. China Motor engineering report, 2014,18:2898-2905, the open-loop control method is adopted, but when the load is suddenly changed, the stability of the output voltage cannot be maintained; most of the publications adopt a phase-shifting control method which has good dynamic performance and is easy to control, and the publication number is as follows: CN106357115A discloses a phase-shift control method for a bidirectional full-bridge DC-DC converter, which adjusts the duty ratio by adjusting the phase shift angle between the switching tubes, and controls the output voltage and the output power of the converter; also disclosed are: CN105207486A discloses a bidirectional resonant DC converter and a control method thereof, when energy is transmitted from a low-voltage side to a high-voltage side, a phase-shifting control method is adopted; when the energy is transmitted from the high-voltage side to the low-voltage side, a frequency conversion control method is adopted; the method can realize bidirectional transmission and control of energy at two sides, and can realize soft switching in a full load range, but the control method is more complex and is not easy to realize; aiming at the soft switching characteristic of the CLLLC type bidirectional DC-DC converter, the voltage stabilization can not be realized in the whole working range by adopting a phase-shifting control method; the method comprises the following steps of (1) carrying out soft start and power commutation control on a bidirectional LLC resonant direct current transformer [ J ] by adopting a phase shift control method, wherein the switching frequency works at a resonant frequency, so that harmonic components of resonant current are increased, and the voltage stability cannot be maintained when the resonant current is disturbed by input voltage and load.
Disclosure of Invention
In order to overcome the defects of the conventional control method, the invention provides a variable frequency control method of a CLLLC (logic link control) type bidirectional DC-DC converter.
The technical scheme adopted for improving the defects of the existing control method is as follows.
A CLLLC type bidirectional DC-DC converter frequency conversion control method is characterized by comprising the following steps: the frequency conversion control method is based on a closed-loop control system, and a control loop of the closed-loop control is formed by connecting a sampling circuit, a conditioning circuit, a compensator and a voltage-controlled oscillator; the voltage-controlled oscillator converts an error voltage signal into a frequency signal, and then converts the frequency signal into a corresponding driving waveform to drive the switching tube, wherein the specific frequency conversion control is performed according to the following method:
taking the difference value between the rated output voltage and the actually measured output voltage as the input of the conditioning circuit;
taking the output of the conditioning circuit as the input of the compensator;
taking the output of the compensator as the input of the voltage-controlled oscillator;
the output of the voltage-controlled oscillator is used as the input of the driving circuit, so that the switching tube is driven.
Further, the solution of the additional technical feature is as follows.
The transfer functions of the sampling circuit and the conditioning circuit of the system are as follows:
whereinG s (s) is the transfer function of the sampling circuit,G ks (s) is the transfer function of the conditioning circuit.
The transfer function of the compensator of the system is:
wherein,R 1、R 2as is the case with the resistor in the compensator,C 1、C 2is the capacitance in the compensator.
The transfer function of the voltage controlled oscillator of the system is:
wherein, DeltafFor the output frequency measurement range of the voltage-controlled oscillator, ΔUIs the input voltage range of the voltage controlled oscillator.
The control loop transfer function of the closed-loop control is as follows:
wherein,G vωand(s) is the transfer function of output-control when the system output voltage is small in disturbance quantity.
The system output voltage small disturbance quantity is as follows:
wherein,G vl(s)、G vi(s) are transfer functions of output-load, output-current, respectively.
Respectively, the small disturbance amounts of the control variable, the input voltage and the output current.
Compared with the prior art, the CLLLC type bidirectional DC-DC converter frequency conversion control method provided by the invention has the following advantages and positive effects.
The method can realize soft switching through LLC resonance, and has high stable control precision and high transmission efficiency.
The method overcomes the defect that the traditional phase shift control and open loop control can not adjust the voltage, can work in a wider frequency range, has good adjusting performance, and greatly improves the dynamic precision of the system.
Drawings
Fig. 1 is a control block diagram of the present method.
Fig. 2 is a system diagram of the present method.
FIG. 3 shows a voltage controlled oscillator in the methodV-fCurve line.
Fig. 4 is a diagram of the open-loop transfer function Bode of the method.
Fig. 5 is a diagram of the closed-loop compensated transfer function Bode of the method.
Fig. 6 is an open loop experimental waveform of the present method.
Fig. 7 is a steady state experimental waveform of the method.
Fig. 8 is a dynamic experimental waveform of the method.
Detailed Description
Fig. 1 shows a variable frequency control method of a CLLLC bidirectional DC-DC converter provided in the present invention, and the validity and feasibility of the algorithm are designed and verified using a CLLLC bidirectional DC-DC converter as a platform, and the system parameters are as follows:U 1=700V，U 2=400V，f s=20kHz，P=10kW，L 1=35uH，L 2=11.4uH，L m=665uH，C 1=7.24uF，C 2=22.17uF。
figure 2 is a diagram of a system in which,U 1is a direct-current power supply at the high-voltage side,U 2for the low-voltage side DC power supply, the power is transmitted from left to right and then transmitted to the positive direction, and the power is transmitted from right to left and then transmitted to the negative direction, S1-S8Is an IGBT switching tube, and when transmitting in the forward direction, S1-S4Form a full bridge inverter circuit, S5-S8To form a full-bridge rectification circuit,L 1、L 2the resonant inductors respectively comprise leakage inductances of a primary side and a secondary side of the high-frequency transformer,L mis the excitation inductance of the high-frequency transformer,C 1、C 2is a resonant capacitor in which the circuit structure is symmetrical, i.e.L 2、C 2Equivalent to the primary side of the transformer andL 1、C 1the values being equal, i.e.L 1=n2 L 2，C 1=C 2/n2The design ensures that the circuit can realize LLC resonance no matter in the forward direction or the reverse direction, no additional buffer circuit is needed, and when in the forward direction,L 1、L mandC 1forming a resonance unit; when the direction is reversed, the motor is started,L 2、C 2and equivalent to the secondary side of the transformerL mConstituting a resonant cell.
Carrying out small signal modeling according to the topological structure of the main circuit to obtain the relation between an input variable and an output variable:
the VCO is a voltage-controlled oscillator and is a core device for control, and can convert an error voltage signal into a frequency signal, and then convert the frequency signal into a corresponding driving waveform, so as to drive the switching tube.
FIG. 3 is a voltage controlled oscillatorV-fThe curve, in the input voltage range, is linear relation to calculate the transfer function。
Fig. 4 is a Bode diagram of the open-loop transfer function, and the obtained dc steady-state amplitude is smaller than zero, about-20 dB, and the frequency bandwidth is relatively narrow, which indicates that the steady-state value of the converter is relatively low when the open-loop works, the dc output gain does not reach the theoretical value, the dynamic response speed is relatively slow, and as can be seen from the frequency law characteristic curve, the dc output gain is greater than-180 ° in the whole frequency interval, and the system performance is relatively poor when the minimum switching frequency of the converter works in a full load state.
According to the circuit structure of the sampling conditioning circuit, the transfer function is calculatedThe signal conditioning circuit filters out high-frequency noise components of the sampled voltage and current signals and adjusts direct-current components of the voltage and current signals in proper proportion.
Obtaining a transfer function before system compensation according to the relation between the transfer function and the sampling conditioning circuit and the voltage-controlled oscillator:
assigning the value, and eliminating zero pole to obtain
The compensation circuit comprises a PI regulator for performing loop compensation on the transfer function to improve its steady-state amplitude and dynamic response speed, so as to stabilize the system and obtain the transfer function of the compensation circuit
Performing phase compensation on the transfer function before compensation to obtain compensated transfer functionTransfer functionAnd assigning the transfer function to obtain a transfer function as follows:
after the design, the frequency characteristics of the variable frequency control system are shown in fig. 5, the direct current steady-state amplitude, the crossing frequency and the frequency bandwidth are multiplied compared with those before compensation, but the phase margin at the crossing frequency point is reduced and still larger than 45 degrees, so that the direct current output gain of the converter is closer to a theoretical value, the dynamic response speed is higher, and the dynamic response speed of the system is improved.
The accuracy of the proposed control method was verified experimentally in both steady-state and dynamic states, with experimental waveforms as shown in fig. 6, 7 and 8.
FIG. 6 shows the waveform of the open loop experiment of the method, which verifies the resonance of the converter and the driving signalU gs1Before arrival, the switch tube S1Voltage acrossU ceHas dropped to zero, achieving ZVS.
FIG. 7 is a waveform of a steady-state experiment of the method, which verifies that the control method enables the system to have higher steady-state control precision, the experiment is carried out when the input voltage of the high-voltage side is 700V, and the driving voltage can be seen in FIG. 7U gs1When generated, the low voltage side outputs voltageU 2Is 400V, resonant currenti L1Approximately a sine wave.
FIG. 8 shows the dynamic experimental waveforms of the method, which verifies that the control method enables the system to have rapid dynamic response precision, and when the load is changed from no-load to full-load, the system can complete the output voltage in three cyclesU 2Resonant currenti L1The stability of (2).
Claims (6)
1. A CLLLC type bidirectional DC-DC converter frequency conversion control method is characterized by comprising the following steps: the frequency conversion control method is based on a closed-loop control system, and a control loop of the closed-loop control is formed by connecting a sampling circuit, a conditioning circuit, a compensator and a voltage-controlled oscillator; the voltage-controlled oscillator converts an error voltage signal into a frequency signal, and then converts the frequency signal into a corresponding driving waveform to drive the switching tube, wherein the specific frequency conversion control is performed according to the following method:
taking the difference value between the rated output voltage and the actually measured output voltage as the input of the conditioning circuit;
taking the output of the conditioning circuit as the input of the compensator;
taking the output of the compensator as the input of the voltage-controlled oscillator;
the output of the voltage-controlled oscillator is used as the input of the driving circuit, so that the switching tube is driven.
2. Method for controlling the frequency conversion of a bidirectional DC-DC converter of the CLLLC type as claimed in claim 1, characterized in that: the transfer functions of the sampling circuit and the conditioning circuit of the system are as follows:
whereinG s (s) is the transfer function of the sampling circuit,G ks (s) is the transfer function of the conditioning circuit.
3. Method for controlling the frequency conversion of a bidirectional DC-DC converter of the CLLLC type as claimed in claim 1, characterized in that: the transfer function of the compensator of the system is:
wherein,R 1、R 2as is the case with the resistor in the compensator,C 1、C 2is the capacitance in the compensator.
4. Method for controlling the frequency conversion of a bidirectional DC-DC converter of the CLLLC type as claimed in claim 1, characterized in that: the transfer function of the voltage controlled oscillator of the system is:
wherein, DeltafFor the output frequency measurement range of the voltage-controlled oscillator, ΔUBeing voltage controlled oscillatorsThe input voltage range.
5. Method for controlling the frequency conversion of a bidirectional DC-DC converter of the CLLLC type as claimed in claim 1, characterized in that: the control loop transfer function of the closed-loop control is as follows:
wherein,G vωand(s) is the transfer function of output-control when the system output voltage is small in disturbance quantity.
6. Method for controlling the frequency conversion of a bidirectional DC-DC converter of the CLLLC type as claimed in claim 5, characterized in that: the system output voltage small disturbance quantity is as follows:
wherein,G vl(s)、G vi(s) transfer functions of output-load, output-current, respectively;
respectively, the small disturbance amounts of the control variable, the input voltage and the output current.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI685169B (en) * | 2018-11-15 | 2020-02-11 | 亞力電機股份有限公司 | Bi-directional energy storage system |
| TWI685187B (en) * | 2018-11-15 | 2020-02-11 | 亞力電機股份有限公司 | Bi-directional dc-to-dc converter |
| CN111433075A (en) * | 2019-09-05 | 2020-07-17 | 香港应用科技研究院有限公司 | Intelligent power supply center |
| CN112202336A (en) * | 2020-09-17 | 2021-01-08 | 华南理工大学 | Control method of bidirectional CLLLC type converter capable of automatically switching power directions |
| WO2021042409A1 (en) * | 2019-09-05 | 2021-03-11 | Hong Kong Applied Science and Technology Research Institute Company Limited | Smart power hub |
| CN113794381A (en) * | 2021-09-16 | 2021-12-14 | 国网山西省电力公司电力科学研究院 | SCDAB-CLLLC composite direct current transformer with wide voltage regulation range and control method thereof |
| CN116566209A (en) * | 2023-02-24 | 2023-08-08 | 江苏大学 | Control method of isolated bidirectional CLLLC resonant converter |
| WO2023245864A1 (en) * | 2022-06-22 | 2023-12-28 | Hong Kong Applied Science and Technology Research Institute Company Limited | Adaptive power control for two-stage ac/dc or dc/dc isolated power converters |
| WO2024032330A1 (en) * | 2022-08-09 | 2024-02-15 | 河北科技大学 | Light-load operation control system and method for three-phase clllc resonant converter |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI685169B (en) * | 2018-11-15 | 2020-02-11 | 亞力電機股份有限公司 | Bi-directional energy storage system |
| TWI685187B (en) * | 2018-11-15 | 2020-02-11 | 亞力電機股份有限公司 | Bi-directional dc-to-dc converter |
| CN111433075A (en) * | 2019-09-05 | 2020-07-17 | 香港应用科技研究院有限公司 | Intelligent power supply center |
| WO2021042409A1 (en) * | 2019-09-05 | 2021-03-11 | Hong Kong Applied Science and Technology Research Institute Company Limited | Smart power hub |
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| CN112202336A (en) * | 2020-09-17 | 2021-01-08 | 华南理工大学 | Control method of bidirectional CLLLC type converter capable of automatically switching power directions |
| CN112202336B (en) * | 2020-09-17 | 2022-02-15 | 华南理工大学 | Control method of bidirectional CLLLC type converter capable of automatically switching power directions |
| CN113794381A (en) * | 2021-09-16 | 2021-12-14 | 国网山西省电力公司电力科学研究院 | SCDAB-CLLLC composite direct current transformer with wide voltage regulation range and control method thereof |
| CN113794381B (en) * | 2021-09-16 | 2023-05-23 | 国网山西省电力公司电力科学研究院 | SCDAB-CLLLC composite direct-current transformer with wide voltage regulation range and control method thereof |
| WO2023245864A1 (en) * | 2022-06-22 | 2023-12-28 | Hong Kong Applied Science and Technology Research Institute Company Limited | Adaptive power control for two-stage ac/dc or dc/dc isolated power converters |
| WO2024032330A1 (en) * | 2022-08-09 | 2024-02-15 | 河北科技大学 | Light-load operation control system and method for three-phase clllc resonant converter |
| CN116566209A (en) * | 2023-02-24 | 2023-08-08 | 江苏大学 | Control method of isolated bidirectional CLLLC resonant converter |
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Application publication date: 20180504 |