CN117977968A - Control method, device, equipment and medium of double-active full-bridge converter - Google Patents
Control method, device, equipment and medium of double-active full-bridge converter Download PDFInfo
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Abstract
The application discloses a control method, a device, equipment and a medium of a double-active full-bridge converter, wherein the method comprises the following steps: constructing an observer reference model of the double-active full-bridge converter according to circuit parameters of the double-active full-bridge converter; acquiring fundamental wave amplitude and phase of the high-frequency chain current in the current period by using an observer reference model; solving the characteristic feedback quantity of the high-frequency chain current according to the circuit parameters and the fundamental wave amplitude and the phase; the characteristic feedback quantity is added to a control loop of the double-active full-bridge converter to control the double-active full-bridge converter. According to the application, a current sensor is not needed, the influence of the electric noise of the converter on the current sensor is avoided, the fundamental wave amplitude and the phase of the high-frequency chain current in the current period can be obtained through the reference model of the observer, the high-frequency chain current is observed, the purpose of replacing the current sensor is achieved, the characteristic feedback quantity is introduced into the feedback control loop, the double-active bridge double-closed loop dynamic control is realized, and the method can be widely applied to the technical field of converter control.
Description
Technical Field
The present application relates to the field of converter control technologies, and in particular, to a method, an apparatus, a device, and a medium for controlling a dual active full bridge converter.
Background
In practical operation, the dynamic performance of a DC-DC converter (direct current to direct current converter) is important. When the operating conditions of the DC-DC converter change, for example: the bus voltage fluctuates, circuit parameters change, output impedance change or environmental noise influence, and the DC-DC converter needs to be stabilized again by realizing rapid dynamic response of the DC-DC converter through a reasonably designed controller. The control method generally adopted by the current Dual-active-bridge DC-DC converter (DAB) control is a direct voltage feedback method under single phase shift control (SINGLE PHASE SHIFT, SPS) modulation, or a high-frequency chain current feedforward method of voltage feedback, which is feedforward control, but the high-frequency chain current feedforward often needs a better-performing current sensor because the Dual-active-bridge high-frequency chain current has high frequency (such as 250kHz-1 mHz), has a large instantaneous peak value (several hundred amperes) and is a pure alternating current component, and the current sensor is extremely easily influenced by the electrical noise of the converter under such high-frequency working condition, thereby causing larger error and further affecting the dynamic performance of the Dual-active-bridge DC-DC converter.
Disclosure of Invention
The embodiment of the application mainly aims to provide a control method, a device, equipment and a medium of a double-active full-bridge converter so as to improve the dynamic performance of the double-active full-bridge DC-DC converter.
To achieve the above object, an aspect of an embodiment of the present application provides a control method of a dual active full bridge converter, including:
constructing an observer reference model of the double-active full-bridge converter according to circuit parameters of the double-active full-bridge converter;
Acquiring fundamental wave amplitude and phase of the high-frequency chain current in the current period by using the observer reference model;
Solving the characteristic feedback quantity of the high-frequency chain current according to the circuit parameters, the fundamental wave amplitude and the phase;
and adding the characteristic feedback quantity to a control loop of the double-active full-bridge converter to control the double-active full-bridge converter.
In some embodiments, the constructing the observer reference model of the dual active full bridge inverter from circuit parameters of the dual active full bridge inverter includes:
acquiring the circuit parameters of the double-active full-bridge converter;
solving a phase shift working point of the double-active full-bridge converter in a steady state according to the circuit parameters;
Constructing a third-order large signal model of the double-active full-bridge converter according to the circuit parameters and the phase shift working point;
constructing the observer reference model according to the third-order large signal model;
the calculation formula for solving the phase shift working point is as follows:
Wherein the circuit parameters include primary side leakage inductance L s, primary side bus resistance R t, primary side bus voltage V in, and output voltage reference value The rated frequency f of the MOS tube, the secondary side output resistor R, the secondary side filter capacitor C 2 and the high-frequency transformer transformation ratio n; d represents the phase shift operating point.
In some embodiments, the constructing a third order large signal model of the dual active full bridge converter from the circuit parameters and the phase shift operating point includes:
Constructing the third-order large signal model according to the circuit parameters, the phase shift working points and the switch states at two sides of the high-frequency chain;
The third-order large signal model is as follows:
wherein:
The method comprises the steps of selecting output capacitor voltage v o (T) and high-frequency chain current i s (T) as state variables, carrying out per unit on the state variables, and carrying out moving average on the state variables by taking T as a time window to obtain < v o(t)>、<i′s (T); Representing the real part of the primary component of < i' s (t) >, v > Represents the imaginary part of the primary component of < i' s (t) >, and < v o(t)>0 represents the direct component of < v o (t) >; s 1(t)、s2 (t) is the switching state of the two sides of the high-frequency chain; r' t is the primary side resistance; r is a load resistor; /(I)Is the primary side capacitance voltage; is the secondary side capacitor voltage.
In some embodiments, the constructing the observer reference model from the third order large signal model comprises:
Inputting the actual output voltage of the double active full-bridge converter into the observer reference model and making a difference with the output voltage of the observer reference model to obtain an error feedback matrix output by the observer reference model;
configuring poles of the observer reference model, verifying observability conditions of the observer reference model, and solving the error feedback matrix;
The error feedback matrix obtained through solving is put into the observer reference model after pole allocation, and the observer reference model is obtained;
the observer reference model is:
Wherein, Representing the output capacitance voltage observed by the observer,/>Representing the high frequency link current observed by the observer; g 1、g2、g3 is a state feedback coefficient; v i denotes an input voltage.
In some embodiments, the obtaining the fundamental amplitude and phase of the high frequency link current in the present period using the observer reference model includes:
acquiring a reference waveform of a primary fundamental component of a high-frequency chain current of the double-active full-bridge converter by using the observer reference model;
and calculating a sliding average value of the waveform in the current period in the reference waveform by using a time window to obtain the fundamental wave amplitude and the phase.
In some embodiments, said solving for the characteristic feedback quantity of the high-frequency link current from the circuit parameter and the fundamental wave amplitude and phase comprises:
Solving the characteristic feedback quantity of the high-frequency chain current by utilizing a characteristic feedback quantity calculation method;
The characteristic feedback calculation formula is:
Wherein, The steady-state average value is represented, and the circuit parameters comprise primary side leakage inductance L s, primary side bus voltage V in and rated frequency f of the MOS tube; v o denotes the output voltage amplitude.
In some embodiments, the adding the characteristic feedback quantity to a control loop of the dual active full bridge inverter to control the dual active full bridge inverter includes:
And adding the characteristic feedback quantity to a voltage control loop under proportional-integral control of the double-active full-bridge converter so as to control the double-active full-bridge converter.
To achieve the above object, another aspect of the embodiments of the present application provides a control device for a dual active full bridge converter, the device including:
the observer reference model construction unit is used for constructing an observer reference model of the double-active full-bridge converter according to circuit parameters of the double-active full-bridge converter;
The fundamental wave amplitude acquisition unit is used for acquiring the fundamental wave amplitude of the high-frequency chain current in the current period by using the observer reference model;
The characteristic feedback quantity solving unit is used for solving the characteristic feedback quantity of the high-frequency chain current according to the circuit parameters, the fundamental wave amplitude and the phase;
And the characteristic feedback control unit is used for adding the characteristic feedback quantity to a control loop of the double-active full-bridge converter so as to control the double-active full-bridge converter.
To achieve the above object, another aspect of the embodiments of the present application provides an electronic device, which includes a memory storing a computer program and a processor implementing the above method when executing the computer program.
To achieve the above object, another aspect of the embodiments of the present application proposes a computer-readable storage medium storing a computer program which, when executed by a processor, implements the above-mentioned method.
The embodiment of the application at least comprises the following beneficial effects:
According to the application, an observer reference model of the double-active full-bridge converter is constructed according to circuit parameters of the double-active full-bridge converter; obtaining the fundamental wave amplitude of the high-frequency chain current in the current period by using an observer reference model; solving the characteristic feedback quantity of the high-frequency chain current according to the circuit parameters, the fundamental wave amplitude and the phase; the characteristic feedback quantity is added to a control loop of the double-active full-bridge converter to control the double-active full-bridge converter. According to the application, an external current sensor is not needed, the current sensor is prevented from being influenced by electric noise of the converter, but the fundamental wave amplitude of the high-frequency chain current in the current period can be obtained through the observer reference model, the high-frequency chain current is observed, the purpose of replacing the current sensor is achieved, and then the characteristic feedback quantity is introduced into the feedback control loop, so that the double-active-bridge double-closed-loop dynamic control is realized.
Drawings
Fig. 1 is a schematic flow chart of a control method of a dual-active full-bridge converter according to an embodiment of the present application;
fig. 2 is a circuit diagram of a dual active bridge DC-DC converter and a conversion model diagram thereof according to an embodiment of the present application;
FIG. 3 is a block diagram of a method for observing states and controlling feedback of characteristic quantities of a current-free sensor according to an embodiment of the present application;
Fig. 4 is a waveform diagram of a high frequency chain operation of a dual active bridge DC-DC converter according to an embodiment of the present application;
fig. 5 is an observation effect diagram of a high-frequency chain current fundamental wave provided by the embodiment of the application;
FIG. 6 is a graph showing the comparison of the effects of the control method according to the embodiment of the present application and the conventional control method;
fig. 7 is a schematic structural diagram of a control device of a dual-active full-bridge converter according to an embodiment of the present application;
Fig. 8 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with embodiments of the application, but are merely examples of apparatuses and methods consistent with aspects of embodiments of the application as detailed in the accompanying claims.
It is to be understood that the terms "first," "second," and the like, as used herein, may be used to describe various concepts, but are not limited by these terms unless otherwise specified. These terms are only used to distinguish one concept from another. For example, the first information may also be referred to as second information, and similarly, the second information may also be referred to as first information, without departing from the scope of embodiments of the present application. The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination", depending on the context.
The terms "at least one", "a plurality", "each", "any" and the like as used herein, at least one includes one, two or more, a plurality includes two or more, each means each of the corresponding plurality, and any one means any of the plurality.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the application only and is not intended to be limiting of the application.
Before describing embodiments of the present application in detail, a description is first given of related technologies that may be involved in the embodiments of the present application, as follows:
Renewable energy sources, clean energy sources such as distributed generation and the like become main energy development targets. In this context, energy transformation and energy revolution motivated the concept of the energy internet with intelligent management grid scheduling capability. In the architecture of the energy internet, it becomes important to support the plug and play capability of devices such as distributed generation, energy storage and controllable loads, and the power electronic interface technology for effectively managing, scheduling and fault isolation of electric energy.
Among the key technologies for implementing the energy internet, a power electronic transformer (also called a high-frequency isolation transformer) with advantages of high-frequency electrical isolation, adjustable power factor, fault isolation, and high degree of freedom in control is considered as an ideal choice of an energy router. These power electronic transformers serve as core devices for energy routers, providing flexible and efficient energy management and scheduling functions for the energy internet.
Compared with the traditional power frequency transformer, the power electronic transformer not only has advantages in the aspects of higher power density, effective harmonic wave filtering and noise reduction, but also can realize electrical isolation, improve voltage bearing capacity and provide reactive compensation function. In a direct current micro grid, a DC-DC converter is a core component of a high frequency transformer that is not only required to have a power bi-directional flow capability, but also to provide electrical isolation to ensure safety. The Dual active-bridge DC-DC converter (DAB) is considered to be the core circuit most suitable for medium-high voltage high-capacity high-frequency transformers because of its bi-directional flow capability, easy implementation of soft switching, easy implementation of modularization, fast dynamic response, high power density, etc.
In practical operation, the dynamic performance of a DC-DC converter (direct current to direct current converter) is important. When the operating conditions of the DC-DC converter change, for example: the bus voltage fluctuates, circuit parameters change, output impedance change or environmental noise influence, and the DC-DC converter needs to be stabilized again by realizing rapid dynamic response of the DC-DC converter through a reasonably designed controller. The control method adopted by the prior Dual active full-bridge DC-DC converter (DAB) control is a direct voltage feedback method under single phase shift control (SINGLE PHASE SHIFT, SPS) modulation, or a high-frequency chain current feedforward method with voltage feedback, which are both feedforward control, but the high-frequency chain current feedforward often needs a better-performing current sensor because the Dual active full-bridge high-frequency chain current has high frequency (such as 250kHz-1 mHz), has a large instantaneous peak value (several hundred amperes) and is a pure alternating current component, and the current sensor is extremely easily influenced by environmental white noise under such high-frequency working condition, thereby causing larger error and further affecting the dynamic performance of the Dual active full-bridge DC-DC converter.
In view of the above, the embodiments of the present application provide a control method, apparatus, device and medium for a dual-active full-bridge converter. According to the application, an observer reference model of the double-active full-bridge converter is constructed according to circuit parameters of the double-active full-bridge converter; acquiring fundamental wave amplitude and phase of the high-frequency chain current in the current period by using an observer reference model; solving the characteristic feedback quantity of the high-frequency chain current according to the circuit parameters, the fundamental wave amplitude and the phase; the characteristic feedback quantity is added to a control loop of the double-active full-bridge converter to control the double-active full-bridge converter. According to the application, an external current sensor is not needed, the current sensor is prevented from being influenced by electric noise of the converter, but the fundamental wave amplitude of the high-frequency chain current in the current period can be obtained through the observer reference model, the high-frequency chain current is observed, the purpose of replacing the current sensor is achieved, and then the characteristic feedback quantity is introduced into the feedback control loop, so that the double-active-bridge double-closed-loop dynamic control is realized.
The embodiment of the application provides a control method of a double-active full-bridge converter, and relates to the technical field of converter control. The control method provided by the embodiment of the application can be applied to the terminal, the server and software running in the terminal or the server. In some embodiments, the terminal may be, but is not limited to, a smart phone, a tablet computer, a notebook computer, a desktop computer, a smart speaker, a smart watch, a vehicle-mounted terminal, and the like; the server side can be configured as an independent physical server, a server cluster or a distributed system formed by a plurality of physical servers, and can be configured as a cloud server for providing cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDNs, basic cloud computing services such as big data and artificial intelligence platforms, and the server can also be a node server in a blockchain network; the software may be an application or the like that realizes the control method, but is not limited to the above form.
The application is operational with numerous general purpose or special purpose computer system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like. The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
Referring to fig. 1, an embodiment of the present application provides a control method of a dual active full bridge converter, which may include, but is not limited to, S100 to S130, specifically as follows:
S100: and constructing an observer reference model of the double-active full-bridge converter according to the circuit parameters of the double-active full-bridge converter.
Specifically, the current sensor is not needed in the embodiment, but the dual-active full-bridge converter can be observed through the observer reference model, so that the current sensor can be prevented from being influenced by electrical noise.
Further, S100 may include S101 to S104:
s101: acquiring the circuit parameters of the double-active full-bridge converter;
s102: solving a phase shift working point of the double-active full-bridge converter in a steady state according to the circuit parameters;
s103: constructing a third-order large signal model of the double-active full-bridge converter according to the circuit parameters and the phase shift working point;
s104: constructing the observer reference model according to the third-order large signal model;
the calculation formula for solving the phase shift working point is as follows:
Wherein the circuit parameters include primary side leakage inductance L s, primary side bus resistance R t, primary side bus voltage V in, and output voltage reference value The rated frequency f of the MOS tube, the secondary side output resistor R, the secondary side filter capacitor C 2 and the high-frequency transformer transformation ratio n; d represents the phase shift operating point.
Still further, S103 may include:
Constructing the third-order large signal model according to the circuit parameters, the phase shift working points and the switch states at two sides of the high-frequency chain;
The third-order large signal model is as follows:
wherein:
The method comprises the steps of selecting output capacitor voltage v o (T) and high-frequency chain current i s (T) as state variables, carrying out per unit on the state variables, and carrying out moving average on the state variables by taking T as a time window to obtain < v o(t)＞、<i′s (T); Representing the real part of the primary component of < i' s (t) >, v > Representing the imaginary part of the primary component of < i' s (t) >, and < v o(t)>0 represents the direct component of < v o (t) >, after which the superscripts of the variables are explained above; s 1(t)、s2 (t) is the switching state of the two sides of the high-frequency chain; r' t is the primary side resistance; r is a load resistor; Is the primary side capacitance voltage; /(I) Is the secondary side capacitor voltage.
Further, S104 may include S1041 to S1043:
S1041: inputting the actual output voltage of the double active full-bridge converter into the observer reference model and making a difference with the output voltage of the observer reference model to obtain an error feedback matrix output by the observer reference model;
s1042: configuring poles of the observer reference model, verifying observability conditions of the observer reference model, and solving the error feedback matrix;
S1043: the error feedback matrix obtained through solving is put into the observer reference model after pole allocation, and the observer reference model is obtained;
the observer reference model is:
Wherein, Representing the output capacitance voltage observed by the observer,/>The high-frequency chain current observed by the observer is represented, and the upper and lower label explanations are identical to those described in S103; g 1、g2、g3 is a state feedback coefficient; v i denotes an input voltage.
S110: and acquiring the fundamental wave amplitude and the phase of the high-frequency chain current in the current period by using the observer reference model.
Further, S110 may include S111 to S112:
S111: acquiring a reference waveform of a primary fundamental component of a high-frequency chain current of the double-active full-bridge converter by using the observer reference model;
s112: and calculating a sliding average value of the waveform in the current period in the reference waveform by using a time window to obtain the fundamental wave amplitude and the phase.
S120: and solving the characteristic feedback quantity of the high-frequency chain current according to the circuit parameter, the fundamental wave amplitude and the phase.
Further, S120 may include:
Solving the characteristic feedback quantity of the high-frequency chain current by utilizing a characteristic feedback quantity calculation method;
The characteristic feedback calculation formula is:
Wherein, The steady-state average value is represented, and the circuit parameters comprise primary side leakage inductance L s, primary side bus voltage V in and rated frequency f of the MOS tube; v o denotes the output voltage amplitude.
S130: and adding the characteristic feedback quantity to a control loop of the double-active full-bridge converter to control the double-active full-bridge converter.
Further, S130 may include:
And adding the characteristic feedback quantity to a voltage control loop under proportional-integral control of the double-active full-bridge converter so as to control the double-active full-bridge converter.
The following describes and illustrates the embodiments of the present application in detail with reference to specific examples of application:
Referring to fig. 2, the present embodiment provides a circuit diagram of a dual active bridge DC-DC converter and a reduced model diagram thereof. Referring to fig. 3, the present embodiment provides a block diagram of a state observation and characteristic quantity feedback control method of a no-current sensor.
Specifically, with reference to fig. 2 and 3, the present embodiment may include S1 to S8 as follows:
S1, acquiring circuit parameters of a Dual-active-bridge DC-DC converter (DAB), wherein the circuit parameters comprise: primary leakage inductance L s, primary bus resistor R t, primary bus voltage V in, and output voltage reference value The rated frequency f of the MOS tube, the secondary side output resistor R, the secondary side filter capacitor C 2 and the high-frequency transformer transformation ratio n. Optionally, the circuit parameter acquired in this embodiment may be an inaccurate value, that is, the circuit parameter is not required to be acquired accurately, and the corresponding approximate value is acquired.
Optionally, specific values of the circuit parameters in this embodiment are: primary side leakage inductance L s =84 μf, primary side bus resistance R t =0.01Ω, primary side bus voltage V in =700V, output voltage reference valueRated frequency f=1 kHz of the MOS tube, secondary side output resistance R=7.2Ω, secondary side filter capacitor C 2 =650 μF, high frequency transformer transformation ratio n=7/6.
S2, calculating a phase shift working point D in a steady state:
S3, establishing a DAB third-order large signal model, and providing model reference for observer reference model design: and outputting capacitor voltage v o and high-frequency chain current i s as state variables, and S 1(t)、s2 (t) which are the switching states of two sides of the high-frequency chain according to the circuit parameters obtained in the step S1 and the phase-shifting working point obtained in the step S2. Taking T as a time window, carrying out moving average on the state variable v o、is to obtain < v o(t)>、<i′s (T) >, and separating the real part and the imaginary part of the state < i s>k (T) to obtain Finally, a DAB 3-order large signal model is established specifically as follows (the following formula state variables and partial parameters are subjected to per unit):
wherein:
S4, constructing an observer reference model:
S41, taking actual output voltage v o sensor data as an observer reference model correction quantity, and connecting the correction quantity into the observer reference model and the output voltage of the observer reference model Making difference, and finally introducing an observer reference model to output an error feedback matrix/>And correcting the high-frequency chain current fundamental wave of the observer reference model.
S42, configuring poles of the observer reference model, verifying observability conditions of the observer reference model, and finally calculating an error feedback matrix G in S41. Alternatively, the process may be carried out in a single-stage,
S5, introducing the error feedback matrix obtained by solving into an observer reference model after pole allocation to obtain the observer reference model:
S6, referencing the observer obtained in S5 to form a state variable The sine and cosine quantity consistent with the rated frequency f of the MOS tube are multiplied, and the primary fundamental wave component/>, of the high-frequency chain current i s of the double-active full-bridge converter is obtained through reductionIs included in the reference waveform of (a). Alternatively, in the present embodiment/>
S7, extracting a characteristic feedback quantity phi * according to the uniform characteristic of the high-frequency chain current by the reference waveform of the high-frequency chain current fundamental wave waveform observed in S6, whereinThe average value of the steady-state period amplitude of the current waveform observed in the step S6 is obtained. Separating the characteristic feedback quantity phi * from the variable/>, according to the observer reference modelThe corresponding function relation between the two can be used for solving the characteristic feedback quantity phi * according to the following calculation formula:
S8, introducing the characteristic feedback quantity phi * obtained in the S7 into a control loop, and sending the characteristic feedback quantity phi * into a PI controller to form double closed-loop control.
Next, description will be made with reference to the embodiment example drawings.
Fig. 4 is a high-frequency chain operation waveform diagram of the dual-active bridge DC-DC converter according to the present embodiment, which includes a high-frequency chain current waveform i s (this waveform is not required to be detected in practical application in order to verify the validity of the observer reference model), a high-frequency primary side input voltage V AB ≡700V, and a high-frequency secondary side V CD ≡600V, so that the operation effect of the observer reference model is substantially consistent with the calculation effect, and the validity of building the simulink model is illustrated.
Fig. 5 is an observation effect diagram obtained by observing a high-frequency chain current fundamental wave by using an observer reference model in the embodiment, and it can be seen from the effect diagram that when the high-frequency chain current i s tends to be stable, the observer reference model can directly observe the fundamental wave component of i s, and basically no observation delay phenomenon exists, so that the high accuracy provides a basis for accurate calculation and feedback control of the following characteristic quantity phi *.
Fig. 6 is a graph comparing the effects of the control method of the present embodiment with those of the existing output point voltage adjusting method with single closed loop voltage feedback, and as can be obtained from fig. 6, the control method of the present embodiment can basically realize overshoot-free control, and the adjusting time is shorter, because the phase shift reference quantity phi * is used as the feedback to be connected to the control loop to realize faster dynamic response.
The embodiment provides a high-order high-precision observer applied to a double-active full-bridge DC-DC converter, namely an observer reference model, wherein the observer reference model does not need an external current sensor, and can observe a high-frequency chain current fundamental wave only through sampling data of a voltage sensor so as to achieve the purpose of replacing the current sensor.
At present, the voltage and current double closed-loop control adopted in DAB requires a high-precision high-frequency chain current sensor, often most of the time is influenced by environmental noise, the high-frequency current is difficult to realize accurate feedback, the high-frequency chain current frequency is 250kHz-1mHz under most conditions, and the current transient value can reach hundreds of amperes, which causes great obstruction to the application of the current sensor. Therefore, the present embodiment provides a dynamic control method for a dual active full-bridge DC-DC converter: and constructing an observer reference model in a third-order state to observe the fundamental wave component and the output voltage of the high-frequency chain alternating current of the double-active full-bridge DC-DC converter, further calculating a characteristic feedback quantity (namely a reference phase shift angle) by using the observer reference model, and introducing the characteristic feedback quantity into a feedback control loop to realize double-closed loop control of the double-active bridge. The embodiment does not need a current sensor, can realize double closed loop control of the double active bridges by only relying on a voltage sensor, has stronger robustness and shorter stabilizing time compared with voltage feedback control, and can realize overshoot-free control under most conditions.
Referring to fig. 7, the embodiment of the present application further provides a control device for a dual active full bridge converter, which may implement the above control method, where the device includes:
the observer reference model construction unit is used for constructing an observer reference model of the double-active full-bridge converter according to circuit parameters of the double-active full-bridge converter;
The fundamental wave amplitude acquisition unit is used for acquiring the fundamental wave amplitude and the phase of the high-frequency chain current in the current period by using the observer reference model;
The characteristic feedback quantity solving unit is used for solving the characteristic feedback quantity of the high-frequency chain current according to the circuit parameters, the fundamental wave amplitude and the phase;
And the characteristic feedback control unit is used for adding the characteristic feedback quantity to a control loop of the double-active full-bridge converter so as to control the double-active full-bridge converter.
It can be understood that the content in the above method embodiment is applicable to the embodiment of the present device, and the specific functions implemented by the embodiment of the present device are the same as those of the embodiment of the above method, and the achieved beneficial effects are the same as those of the embodiment of the above method.
The embodiment of the application also provides electronic equipment, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the control method when executing the computer program. The electronic equipment can be any intelligent terminal including a tablet personal computer, a vehicle-mounted computer and the like.
It can be understood that the content in the above method embodiment is applicable to the embodiment of the present apparatus, and the specific functions implemented by the embodiment of the present apparatus are the same as those of the embodiment of the above method, and the achieved beneficial effects are the same as those of the embodiment of the above method.
Referring to fig. 8, fig. 8 illustrates a hardware structure of an electronic device according to another embodiment, the electronic device includes:
The processor 801 may be implemented by a general-purpose CPU (central processing unit), a microprocessor, an application-specific integrated circuit (ApplicationSpecificIntegratedCircuit, ASIC), or one or more integrated circuits, etc. for executing related programs to implement the technical solution provided by the embodiments of the present application;
Memory 802 may be implemented in the form of read-only memory (ReadOnlyMemory, ROM), static storage, dynamic storage, or random access memory (RandomAccessMemory, RAM), among others. The memory 802 may store an operating system and other application programs, and when the technical solutions provided in the embodiments of the present disclosure are implemented by software or firmware, relevant program codes are stored in the memory 802, and the processor 801 invokes a control method for executing the embodiments of the present disclosure;
an input/output interface 803 for implementing information input and output;
The communication interface 804 is configured to implement communication interaction between the device and other devices, and may implement communication in a wired manner (e.g., USB, network cable, etc.), or may implement communication in a wireless manner (e.g., mobile network, WIFI, bluetooth, etc.);
A bus 805 that transfers information between the various components of the device (e.g., the processor 801, the memory 802, the input/output interface 803, and the communication interface 804);
Wherein the processor 801, the memory 802, the input/output interface 803, and the communication interface 804 implement communication connection between each other inside the device through a bus 805.
The embodiment of the application also provides a computer readable storage medium, which stores a computer program, and the computer program realizes the control method when being executed by a processor.
It can be understood that the content of the above method embodiment is applicable to the present storage medium embodiment, and the functions of the present storage medium embodiment are the same as those of the above method embodiment, and the achieved beneficial effects are the same as those of the above method embodiment.
The memory, as a non-transitory computer readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer executable programs. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory remotely located relative to the processor, the remote memory being connectable to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The embodiments described in the embodiments of the present application are for more clearly describing the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application, and those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.
It will be appreciated by persons skilled in the art that the embodiments of the application are not limited by the illustrations, and that more or fewer steps than those shown may be included, or certain steps may be combined, or different steps may be included.
The above described apparatus embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Those of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof.
The terms "first," "second," "third," "fourth," and the like in the description of the application and in the above figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one (item)" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the above-described division of units is merely a logical function division, and there may be another division manner in actual implementation, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including multiple instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method of the various embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory RAM), a magnetic disk, or an optical disk, or other various media capable of storing a program.
The preferred embodiments of the present application have been described above with reference to the accompanying drawings, and are not thereby limiting the scope of the claims of the embodiments of the present application. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the embodiments of the present application shall fall within the scope of the claims of the embodiments of the present application.
Claims (10)
1. A method of controlling a dual active full bridge inverter, the method comprising:
constructing an observer reference model of the double-active full-bridge converter according to circuit parameters of the double-active full-bridge converter;
Acquiring fundamental wave amplitude and phase of the high-frequency chain current in the current period by using the observer reference model;
Solving the characteristic feedback quantity of the high-frequency chain current according to the circuit parameters, the fundamental wave amplitude and the phase;
and adding the characteristic feedback quantity to a control loop of the double-active full-bridge converter to control the double-active full-bridge converter.
2. The method for controlling a dual active full bridge inverter according to claim 1, wherein constructing the observer reference model of the dual active full bridge inverter according to the circuit parameters of the dual active full bridge inverter comprises:
acquiring the circuit parameters of the double-active full-bridge converter;
solving a phase shift working point of the double-active full-bridge converter in a steady state according to the circuit parameters;
Constructing a third-order large signal model of the double-active full-bridge converter according to the circuit parameters and the phase shift working point;
Constructing the observer reference model according to the third-order signal large model;
the calculation formula for solving the phase shift working point is as follows:
Wherein the circuit parameters include primary side leakage inductance L s, primary side bus resistance R t, primary side bus voltage V in, and output voltage reference value The rated frequency f of the MOS tube, the secondary side output resistor R, the secondary side filter capacitor C 2 and the high-frequency transformer transformation ratio n; d represents the phase shift operating point.
3. The method according to claim 2, wherein said constructing a third-order large signal model of the dual-active full-bridge converter according to the circuit parameters and the phase shift operating point comprises:
Constructing the third-order large signal model according to the circuit parameters, the phase shift working points and the switch states at two sides of the high-frequency chain;
The third-order large signal model is as follows:
wherein:
The method comprises the steps of selecting output capacitor voltage v o (T) and high-frequency chain current i s (T) as state variables, carrying out per unit on the state variables, and carrying out moving average on the state variables by taking T as a time window to obtain < v o(t)>、<i′s (T); representing the real part of the primary component of < i' s (t >), Represents the imaginary part of the primary component of < i' s (t) >, and < v o(t)>0 represents the direct component of < v o (t) >; s 1(t)、s2 (t) is the switching state of the two sides of the high-frequency chain; r' t is the primary side resistance; r is a load resistor; /(I)Is the primary side capacitance voltage; /(I)Is the secondary side capacitor voltage.
4. A method of controlling a dual active full bridge inverter according to claim 3, wherein said constructing said observer reference model from said third order signal large model comprises:
Inputting the actual output voltage of the double active full-bridge converter into the observer reference model and making a difference with the output voltage of the observer reference model to obtain an error feedback matrix output by the observer reference model;
configuring poles of the observer reference model, verifying observability conditions of the observer reference model, and solving the error feedback matrix;
The error feedback matrix obtained through solving is put into the observer reference model after pole allocation, and the observer reference model is obtained;
the observer reference model is:
Wherein, Representing the output capacitance voltage observed by the observer,/>Representing the high frequency link current observed by the observer; g 1、g2、g3 is a state feedback coefficient; v i denotes an input voltage.
5. The method for controlling a dual active full bridge inverter according to claim 1, wherein the obtaining the fundamental wave amplitude and the phase of the high frequency link current in the current period by using the observer reference model comprises:
acquiring a reference waveform of a primary fundamental component of a high-frequency chain current of the double-active full-bridge converter by using the observer reference model;
and calculating a sliding average value of the waveform in the current period in the reference waveform by using a time window to obtain the fundamental wave amplitude and the phase.
6. The method according to claim 1, wherein the step of solving the characteristic feedback quantity of the high-frequency link current according to the circuit parameter and the fundamental wave amplitude and phase comprises:
Solving the characteristic feedback quantity of the high-frequency chain current by utilizing a characteristic feedback quantity calculation method;
The characteristic feedback calculation formula is:
Wherein, The current high-frequency chain current fundamental wave amplitude is represented, the circuit parameters comprise primary side leakage inductance L s, primary side bus voltage V in, rated frequencies f and V o of the MOS tube, and the output voltage amplitude is represented.
7. A method of controlling a dual active full bridge inverter according to any one of claims 1 to 6, wherein said adding the characteristic feedback quantity to the control loop of the dual active full bridge inverter to control the dual active full bridge inverter comprises:
And adding the characteristic feedback quantity to a voltage control loop under proportional-integral control of the double-active full-bridge converter so as to control the double-active full-bridge converter.
8. A control device for a double active full bridge inverter, the device comprising:
the observer reference model construction unit is used for constructing an observer reference model of the double-active full-bridge converter according to circuit parameters of the double-active full-bridge converter;
The fundamental wave amplitude acquisition unit is used for acquiring the fundamental wave amplitude and the phase of the high-frequency chain current in the current period by using the observer reference model;
The characteristic feedback quantity solving unit is used for solving the characteristic feedback quantity of the high-frequency chain current according to the circuit parameters, the fundamental wave amplitude and the phase;
And the characteristic feedback control unit is used for adding the characteristic feedback quantity to a control loop of the double-active full-bridge converter so as to control the double-active full-bridge converter.
9. An electronic device comprising a memory storing a computer program and a processor implementing the method of any of claims 1 to 7 when the computer program is executed by the processor.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the method according to any one of claims 1 to 7.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150349649A1 (en) * | 2014-06-02 | 2015-12-03 | Utah State University | Zero voltage switching operation of a minimum current trajectory for a dc-to-dc converter |
| CN108959780A (en) * | 2018-07-06 | 2018-12-07 | 中国科学院电工研究所 | The big signal simulation model of Monophase electric power electronic transformer |
| CN110518801A (en) * | 2019-07-11 | 2019-11-29 | 杭州电子科技大学 | A kind of lower pair of active full-bridge converter Approach for Modeling of Small-Signal of dual phase shift modulation |
| US20220045618A1 (en) * | 2020-08-04 | 2022-02-10 | Delta Electronics, Inc. | Multiple-port bidirectional converter and control method thereof |
| CN115021570A (en) * | 2022-05-26 | 2022-09-06 | 上海交通大学 | Circuit modeling method and output current control method of double-active-bridge micro inverter |
| CN116317608A (en) * | 2023-05-17 | 2023-06-23 | 国网湖北省电力有限公司经济技术研究院 | Hybrid control method and system for double-active full-bridge DC-DC converter |
-
2024
- 2024-01-03 CN CN202410015028.6A patent/CN117977968B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150349649A1 (en) * | 2014-06-02 | 2015-12-03 | Utah State University | Zero voltage switching operation of a minimum current trajectory for a dc-to-dc converter |
| CN108959780A (en) * | 2018-07-06 | 2018-12-07 | 中国科学院电工研究所 | The big signal simulation model of Monophase electric power electronic transformer |
| CN110518801A (en) * | 2019-07-11 | 2019-11-29 | 杭州电子科技大学 | A kind of lower pair of active full-bridge converter Approach for Modeling of Small-Signal of dual phase shift modulation |
| US20220045618A1 (en) * | 2020-08-04 | 2022-02-10 | Delta Electronics, Inc. | Multiple-port bidirectional converter and control method thereof |
| CN115021570A (en) * | 2022-05-26 | 2022-09-06 | 上海交通大学 | Circuit modeling method and output current control method of double-active-bridge micro inverter |
| CN116317608A (en) * | 2023-05-17 | 2023-06-23 | 国网湖北省电力有限公司经济技术研究院 | Hybrid control method and system for double-active full-bridge DC-DC converter |
Non-Patent Citations (1)
| Title |
|---|
| 卢建华 等；: "基于DPS控制的双向全桥直流变换器的建模", 海军航空工程学院学报, vol. 34, no. 05, 30 October 2019 (2019-10-30), pages 437 - 440 * |
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