CN114844364B - DAB converter no-current sensor control method based on model prediction - Google Patents
DAB converter no-current sensor control method based on model prediction Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—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 with automatic control of the output voltage or current, e.g. flyback converters with digital control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—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
- H02M3/33569—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 several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
-
- 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
- H02M3/33569—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 several active switching elements
- H02M3/33576—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- 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
- H02M3/33569—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 several active switching elements
- H02M3/33576—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a DAB converter no-current sensor control method based on model prediction, wherein a reference voltage V Ref and an output voltage V O are subjected to a voltage compensator G V to obtain a current reference value I Ref; the digital controller obtains an input voltage V In and an output voltage V O of the converter, combines a phase shift angle p output by the current compensator G C, predicts load current by using a load current prediction model, and takes a load current prediction result I O(pre) as a feedback value of the current compensator G C; the current reference value I Ref and the load current prediction result I O(pre) are passed through the current compensator G C to obtain a phase shift angle p. The phase shifting angle p is converted into a switching signal for driving the primary side switching tube and the secondary side switching tube through the PWM modulation module, so that the control of the converter is realized. The voltage and current control realized by the method only needs a voltage sensor and does not need a current sensor, so that the dynamic response speed higher than that of the voltage control can be realized, and the current limiting control is supported.
Description
Technical Field
The invention belongs to the technical field of power electronic converter control, and relates to a DAB converter current-free sensor control method based on model prediction.
Background
The DAB converter has the advantages of small voltage and current stress of a switching device, symmetrical structure, easy realization of ZVS and the like, and is suitable for the occasion of medium and high power direct current power supply conversion.
Compared with voltage control, the DAB converter with voltage and current double-loop control has higher dynamic response performance. In addition, the addition of current control can support the converter to operate in a current limited mode.
However, current control requires the addition of more sensors and sampling circuitry, increasing system complexity and cost. Therefore, the invention discloses a DAB voltage and current control double-loop control method based on model prediction without a current sensor, which improves the prior art to overcome the defects in the prior art.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a DAB converter current-free sensor control method based on model prediction.
Technical proposal
A DAB converter no-current sensor control method based on model prediction is characterized by comprising the following steps:
Step 1: the output voltage given value V ref and the output voltage sampling value V out are subjected to difference to obtain a voltage error value, and then the voltage error value passes through a voltage compensator G v to obtain a given value I ref of the current inner ring;
step 2, predicting load current I o(pre):
1. Sampling an input voltage V in and an output voltage V out of the DAB converter, and calculating turning points of the inductive current in the current switching period by combining a phase-shifting angle p k of the current switching period, wherein the turning points are respectively as follows:
Wherein: i L (T) is the value of the inductive current at the T moment, T 0 is the starting moment of the current switching period, T 1,t2,t3 is the 1 st, 2 nd and 3 rd turning moments of the inductive current, T 4 is the ending moment of the current switching period, T s is the switching period, V in is the input voltage of the converter, V out is the output voltage of the converter, n is the turn ratio of the transformer, and L is the inductive value;
2. Calculating to obtain a secondary side current waveform i sec＝niL of the transformer according to the turn ratio n of the transformer;
3. performing half-period polarity inversion on the secondary side current i sec to obtain a current i H flowing out of the secondary side H bridge;
4. Calculating the average value of the current I H flowing out of the secondary side rectifier bridge to obtain a load current prediction result I o(pre);
Step 3: the current inner loop given value I ref and the load current predicted value I o(pre) are subjected to difference to obtain an error value of the current, and the error value is subjected to a current compensator G c to obtain a phase shift control signal p k+1 of the next switching period;
Step 4: and generating square wave signals with the phase difference of p k+1Ts according to the phase-shift control signal p k+1, respectively driving the primary side H bridge and the secondary side H bridge, and repeating the processes in the next period to realize the control of the DAB converter.
The voltage compensator G v is replaced with PI.
The current compensator G C is replaced with PI.
Advantageous effects
According to the DAB converter current-free sensor control method based on model prediction, a reference voltage V ref and an output voltage V out are subjected to a voltage compensator G V to obtain a current reference value I ref; the digital controller obtains an input voltage V in and an output voltage V out of the converter, combines a phase shift angle p k output by the current compensator G C, predicts load current by using a load current prediction model, and takes a load current prediction result I o(pre) as a feedback value of the current compensator G C; the current reference value I ref and the load current prediction result I o(pre) are passed through the current compensator G C to obtain a phase shift angle p k+1. The phase shift angle p k+1 is converted into a switching signal for driving the primary side switching tube and the secondary side switching tube through the PWM modulation module, so that the control of the converter is realized. The voltage and current control realized by the method only needs a voltage sensor and does not need a current sensor, so that the dynamic response speed higher than that of the voltage control can be realized, and the current limiting control is supported.
Compared with the prior art, the application has the following beneficial effects: the control method of the application realizes the control of output voltage and current and has good dynamic response performance. Meanwhile, the load current is predicted through the load current prediction model, an additional current sensor is not needed, and the complexity of the system is reduced.
Drawings
FIG. 1 is a DAB converter topology of the present invention;
FIG. 2 is a control block diagram of the DAB converter no-current sensor control method based on model prediction of the present invention;
fig. 3 is a timing diagram of a digital implementation of the DAB converter currentless sensor control method of the present invention during a control period based on model prediction.
Detailed Description
The invention will now be further described with reference to examples, figures:
the invention provides a DAB converter no-current sensor control method based on model prediction, which aims to solve the problems that an extra sensor and a sampling circuit are needed in a voltage and current control system in the prior art, and the system is too complex.
The aim of the application is achieved by the following technical scheme:
the output voltage control implementation method comprises the following steps:
The output voltage V out of the DAB converter is obtained and compared with the output voltage reference value V ref to obtain a voltage error value, and then the voltage error value passes through the voltage compensator G V to obtain the given value I ref of the current inner loop.
The load current prediction method comprises the following steps:
Wherein i L (T) is the value of the inductive current at the time T, T 0 is the starting time of the current switching period, T 1,t2,t3 is the 1 st, 2 nd and 3 rd turning times of the inductive current, T 4 is the ending time of the current switching period, T s is the switching period, V in is the input voltage of the converter, V out is the output voltage of the converter, n is the turn ratio of the transformer, and L is the inductive value;
calculating to obtain a secondary side current waveform i sec＝niL of the transformer according to the turn ratio n of the transformer;
Performing half-period polarity inversion on the secondary side current i sec to obtain a current i H flowing out of the secondary side H bridge;
Calculating the average value of the current I H flowing out of the secondary side rectifier bridge to obtain a load current prediction result I o(pre);
In an embodiment, a DAB converter no-current sensor control method based on model prediction is disclosed:
fig. 1 is a structural diagram of a topology used in the present invention, and by controlling a phase shift angle between primary and secondary sides of a transformer, power transmission control can be realized, and the control method is as follows:
Acquiring input voltage, output reference voltage and output voltage of the double-active-bridge converter;
obtaining a phase shift angle according to the obtained input voltage, output voltage and output reference voltage and a voltage-current controller;
Controlling power transmission according to the phase shift angle under the phase shift control;
Fig. 2 is a model prediction-based DAB converter currentless sensor control method, which comprises the following specific steps:
And obtaining the phase shift angle under phase shift control according to the inductance current prediction model. The inductance current prediction model is obtained through the following steps: carrying out induction current waveform prediction according to the relation between the phase shift angle of the converter and the input voltage, the output voltage and the induction current;
Further, according to the turn ratio of the transformer, an average value is calculated, and a load current can be obtained.
The control implementation process of the load current comprises the following steps:
and obtaining an error value of the load current through the output value of the voltage compensator and the load current predicted value, and controlling the load current by utilizing the current compensator.
The control sequence of the DAB converter no-current sensor control method based on model prediction disclosed in this embodiment is described in detail:
fig. 3 is a timing diagram of a digital implementation of the DAB converter currentless sensor control method of the present invention during a control period based on model prediction.
The control period is selected as a switching period Ts in the figure;
In the control period, the following process is completed: after the V in、Vout is sampled, carrying out induction current waveform prediction, load current calculation and phase shift angle calculation;
The above process is completed in one control period, so that the PWM comparator of the control program is in a waiting loading state, and the PWM output of the beginning of the next period is ensured.
The control method in the invention comprises the following steps: the given value I ref of the current inner loop is obtained through a voltage compensator G V (which can be PI); simultaneously, a load current prediction result I o(pre) is calculated by using a load current prediction model and is used as a feedback value of a current compensator; and then the voltage and current double-loop control is realized through the control of a current compensator G C (which can be PI).
The load current prediction model comprises the following components: the method comprises the steps of obtaining input voltage V in and output voltage V out of the double-active-bridge converter, and realizing equivalent prediction of load current according to the relation between phase shift angle p k of the current period of the converter, input voltage V in, output voltage V out and load current.
The load current prediction process comprises the following steps: and calculating inductance current waveform information, and calculating a load current average value according to the turn ratio of the transformer.
The control process of the voltage compensator comprises the following steps: the output voltage reference value V ref and the output voltage feedback value V out are subjected to difference to obtain a voltage error value, and then the voltage error value passes through a voltage compensator G V to obtain a given value I ref of the current inner loop.
The control process of the current compensator comprises the following steps: the current reference value I ref and the load current predicted value I o(pre) are subjected to difference to obtain a current error value, and the phase-shift control signal p k+1 is obtained through the current compensator G C, so that the control of the working voltage and the current of the converter is realized.
Claims (3)
1. A DAB converter no-current sensor control method based on model prediction is characterized by comprising the following steps:
Step 1: will output voltage set value And output voltage sample value/>Obtaining a voltage error value by making a difference, and then passing through a voltage compensator/>Obtain the given value/>, of the inner current loop；
Step2, predicting load current：
Step 2-1, sampling the input voltage of the DAB converterAnd output voltage/>Phase shift angle combined with current switching periodThe turning points of the inductance current in the current switching period are calculated as follows:
Wherein: is the value of the inductance current at the time t,/> For the current switching cycle start time,/>Respectively the 1 st, 2 nd and 3 rd turning moments of the inductive current,/>For the current switching cycle termination time,/>For the switching period of the switch-on and switch-off period,For the output voltage of the converter,/>For the turn ratio of the transformer,/>Is the inductance value;
Step 2-2, according to the turn ratio of the transformer Calculating to obtain the current waveform/>, of the secondary side of the transformer；
Step 2-3, the secondary side current is calculatedPerforming half-period polarity inversion to obtain the current/>, flowing out of the secondary side H bridge；
Step 2-4, for the current flowing out of the secondary side rectifier bridgeCalculating the average value to obtain a load current prediction result/>；
Step 3: by setting the inner loop of the current to a given valueAnd load current prediction value/>Obtaining an error value of the current by making a difference, and passing the error value through a current compensator/>Obtaining the phase shift control signal/>, of the next switching period；
Step 4: according to the phase-shift control signalGenerating a phase difference of/>The square wave signals of the primary side H bridge and the secondary side H bridge are respectively driven, and the process is repeated in the next period, so that the DAB converter is controlled.
2. The DAB converter currentless sensor control method based on model predictive as recited in claim 1, wherein: the voltage compensator。
3. The DAB converter currentless sensor control method based on model predictive as recited in claim 1, wherein: the current compensatorReplaced with PI.
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| US10454366B1 (en) * | 2018-09-19 | 2019-10-22 | Shanghai Jiao Tong University | Current sensorless control method for DAB-based single stage isolated PFC converters |
| CN113206499A (en) * | 2021-04-23 | 2021-08-03 | 西安理工大学 | DAB converter control method based on double closed-loop model prediction and PI composite control |
| WO2021179709A1 (en) * | 2020-03-11 | 2021-09-16 | 合肥科威尔电源***股份有限公司 | Three phase dual active bridge direct current converter control system and control method |
| CN113765408A (en) * | 2021-10-08 | 2021-12-07 | 山东大学 | DAB converter turn-off loss optimization control method and system based on predictive control |
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2022
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| US10454366B1 (en) * | 2018-09-19 | 2019-10-22 | Shanghai Jiao Tong University | Current sensorless control method for DAB-based single stage isolated PFC converters |
| WO2021179709A1 (en) * | 2020-03-11 | 2021-09-16 | 合肥科威尔电源***股份有限公司 | Three phase dual active bridge direct current converter control system and control method |
| CN113206499A (en) * | 2021-04-23 | 2021-08-03 | 西安理工大学 | DAB converter control method based on double closed-loop model prediction and PI composite control |
| CN113765408A (en) * | 2021-10-08 | 2021-12-07 | 山东大学 | DAB converter turn-off loss optimization control method and system based on predictive control |
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| 基于移相控制的DAB变换器的研究;邓和睿;《中国优秀硕士学位论文全文数据库（电子期刊）工程科技II辑》;20220315(第3期);全文 * |
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