Power adaptive control method and device for improving dynamic performance of converter

Abstract

The invention provides a power adaptive control method for improving the dynamic performance of a converter. The method comprises the following steps: deducing a transfer function Gdi (s) from a duty ratio modulation signal d to a battery charging and discharging current Ibat through a small signal model of a battery charging and discharging system taking a bidirectional Buck-Boost converter as a core; extracting a direct-current gain part Gdi0 related to the battery voltage Vbat and the battery current Ibat in the transfer function Gdi (s), and performing normalization processing on the direct-current gain part Gdi0 to obtain a self-adaptive PI control function Gic (s); the actual voltage Vbat of the battery side and the actual current Ibat of battery charging and discharging are detected; inputting the actual voltage Vbat and the actual current Ibat into the adaptive PI control function Gic (s) to obtain coefficient values of Kp and Ki of the adaptive PI control function Gic (s) in the current control beat; performing subtraction to obtain a current error signal ei, and inputting the current error signal ei into the adaptive PI control function Gic (s) obtained in the step S3 to obtain a corresponding duty ratio modulation signal d; and the PWM modulation module generates a driving pulse signal to control the on-off of the main power switch device.

Description

Technical Field

[0001] The present invention relates to the technical field of power direct current converter control, and in particular to a power adaptive control method and device for improving the dynamic performance of a converter. Background Art

[0002] Under the guidance of the dual carbon goals, renewable energy represented by photovoltaic and wind power will play a supporting role in my country's future energy system. However, renewable energy represented by solar and wind power is intermittent, volatile and uncertain. Large-scale development and utilization of renewable energy poses challenges to the safe and stable operation of the power grid.

[0003] As one of the means to solve the challenges of energy transformation, energy storage has developed rapidly in recent years because of its peak-shaving and valley-filling functions, which is conducive to improving the power supply reliability and operational stability of the power grid system. The battery-based energy storage system absorbs excess power from the grid during low load periods and stores it. During peak load periods, it releases the stored energy to the system load, participates in the peak-shaving and frequency-regulation of the grid, and helps to smoothly absorb new energy power.

[0004] Whether in large-scale energy storage power stations or in the field of electric vehicles connected to the grid, power electronic converters are responsible for matching the grid voltage with the battery voltage. The wide range of battery voltage fluctuations in different access systems poses challenges to the design of power converters. As the proportion of new energy continues to increase, the power response requirements for energy storage systems will become more stringent. However, for power converters, widening the voltage matching range and improving dynamic performance are often a contradiction. When ensuring wide voltage range working conditions, the dynamic performance of the converter within a certain voltage range is inevitably sacrificed.

[0005] As one of the core components of the energy storage system, improving the dynamic response speed of the bidirectional DC / DC converter is an effective means to improve the operating performance of the energy storage system under the premise of meeting the wide voltage range matching. In large-capacity energy storage systems, the DC / DC topology mainly adopts a bidirectional Buck-Boost non-isolated circuit. According to the size of the inductance parameters during design, the converter has continuous working mode and discontinuous working mode. The traditional PI controller can no longer meet the requirements of dynamic performance under a wide battery voltage range.

[0006] In this regard, relevant work on the dynamic characteristics of bidirectional Buck-Boost converters has been continuously carried out, and corresponding improvements have been made. Some scholars have designed PI controllers by accurately modeling the parasitic parameters of the switching devices, and improved the dynamic performance of the converter under specific battery voltage conditions. However, with the fluctuations of battery voltage and transmission power, its characteristics cannot be maintained. Other scholars have introduced model predictive control into the control of bidirectional Buck-Boost converters, and based on the theoretical establishment of system models to control the duty cycle of the output, improve the dynamic response speed of the converter. Since the battery voltage and charging and discharging current parameters are considered in the process of model prediction, this method can effectively widen the voltage range of the battery. However, its control accuracy depends on the theoretically established model, and is subject to the measurement accuracy of the inductance parameters and complex parasitic parameters, so the control accuracy is difficult to improve. Even when the converter operates in the current discontinuous mode, its control gain fluctuates more with these parameters, and the controller design will be more difficult at this time.

[0007] In view of this, it is necessary to provide a new power adaptive control method and device for improving the dynamic performance of the converter to overcome the above-mentioned defects. Summary of the invention

[0008] The purpose of the present invention is to provide a power adaptive control method and device for improving the dynamic performance of a converter, so as to solve the problem of slow dynamic response of a bidirectional Buck-Boost converter applied to the field of battery charging and discharging under the existing control mode.

[0009] In order to achieve the above object, the technical solution provided by the present invention is implemented as follows: a power adaptive control method for improving the dynamic performance of a converter, comprising:

[0010] S1: Based on the switch network average model method, a small signal model of the battery charging and discharging system with a bidirectional Buck-Boost converter as the core is established, and the duty cycle modulation signal d is derived to the battery charging and discharging current I bat The transfer function G di (s);

[0011] S2: Let s = 0 and extract the transfer function G di (s) and the battery voltage V bat and the battery current I bat The DC gain part G di0 , and normalize it to get the adaptive PI control function G ic (s);

[0012] S3: Detect the actual voltage V on the battery side of the bidirectional Buck-Boost converter bat and the actual current I of the battery charging and discharging bat ; Using the actual voltage Vbat and the actual current I bat Input to the adaptive PI control function G ic (s) Get the adaptive PI control function G in the current control beat ic (s) K p and K i The coefficient value of

[0013] S4: Set the current command I ref and the actual detected battery current I bat The current error signal e is obtained by subtracting i And input into S3 to obtain the adaptive PI control function G ic (s) obtaining a corresponding duty cycle modulation signal d;

[0014] S5: The duty cycle modulation signal d is used to generate a driving pulse signal through the PWM modulation module to control the on and off of the main power switch device, thereby realizing the battery charging and discharging current instruction I ref Fast follow response.

[0015] Preferably, the transfer function G in step S1 is di (s) is:

[0016]

[0017] In the above formula (1), T s is the switching period, V bat is the battery voltage, I bat is the battery current, R bat is the internal resistance of the connected battery, V in is the input bus voltage.

[0018] Preferably, the battery voltage V bat and the battery current I bat The DC gain part G di0 for:

[0019]

[0020] The adaptive PI control function G described in step S2 ic (s) The structure is:

[0021]

[0022] Preferably, the adaptive PI control function G in step S3 ic (s) K p , K i The coefficient values ​​are:

[0023]

[0024] Preferably, the step S4 comprises:

[0025] S41: The control instruction value I ref With the feedback signal I bat The current error signal e is obtained by subtracting i , e i =I ref -I bat ;

[0026] S42: The current error signal e i Input adaptive PI function G ic (s), according to the battery voltage V bat and current I bat Dynamically adjust its coefficient K p and K i ;PI function G ic The duty cycle modulation signal d output by (s) is modulated by PWM to generate the driving signal of the MOS tubes Q1 and MOSQ2 of the bidirectional Buck-Boost converter. The driving signal is used to control the on and off of the MOS tubes Q1 and Q2.

[0027] A circuit of a power adaptive control method for improving the dynamic performance of a converter comprises: a DC power supply, a half-bridge bidirectional Buck-Boost conversion circuit module, a battery and a control unit; the DC power supply is electrically connected to the half-bridge bidirectional Buck-Boost conversion circuit module, the half-bridge bidirectional Buck-Boost conversion circuit module is electrically connected to the battery and the control unit, and the battery is electrically connected to the control unit.

[0028] Preferably, the half-bridge bidirectional Buck-Boost conversion circuit module includes a capacitor C1, a MOS tube Q1, a MOS tube Q2, a power inductor L1, a power inductor L2 and a filter capacitor C f One end of the capacitor C1 is electrically connected to the positive electrode of the DC power supply and the drain of the MOS tube Q1, the other end of the capacitor C1 is electrically connected to the negative electrode of the DC power supply and the source of the MOS tube Q2, the source of the MOS tube Q1 is electrically connected to the drain of the MOS tube Q2 and one end of the power inductor L1, and the other end of the power inductor L1 is electrically connected to the filter capacitor C f The positive electrode of the battery is electrically connected, the source of the MOS tube Q2 is electrically connected to one end of the power inductor L2, and the other end of the power inductor L2 is electrically connected to the filter capacitor C f Electrically connected to the negative terminal of the battery.

[0029] Preferably, the control unit includes a battery voltage filter capacitor Gf (s) and battery current regulator G ic (s), the battery voltage filter capacitor G f (s) is electrically connected to the battery, the battery current regulator G ic (s) and battery voltage filter capacitor G f (s) is electrically connected to the positive electrode of the battery, and the battery current regulator G ic (s) is also electrically connected to the gate of the MOS tube Q1 and the gate of the MOS tube Q2 through a PWM modulation module.

[0030] A system for a power adaptive control method for improving the dynamic performance of a converter comprises: a detection module, a differential module, an input module and a control module, wherein the detection module, the differential module, the input module and the control module are electrically connected to each other;

[0031] Detection module, used to detect the battery voltage V in the bidirectional Buck-Boost converter charging and discharging device bat And the battery current I bat ; The actual battery voltage V bat and the battery current I bat Input to the calculation module to calculate the adaptive PI function G ic (s), the battery current I bat Input to the difference module;

[0032] As a differential module, it is used to convert the reference output current I ref and the battery current I bat The current error signal e is obtained by subtracting i ;

[0033] Computation module, used to calculate the adaptive PI function G ic The coefficient value K of (s) p and K i ;

[0034] The control module is used to obtain the corresponding driving pulse signal using the duty cycle modulation signal d to realize the battery charging and discharging current instruction I ref Fast follow response.

[0035] A non-transitory computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a power adaptive control method for improving the dynamic performance of a converter.

[0036] Compared with the prior art, the beneficial effects are:

[0037] 1. The control method provided by the present invention establishes a small signal model of a battery charging and discharging system with a Buck-Boost converter as the core, and separates the physical quantities related to the battery load parameters. A corresponding adaptive PI controller is designed to normalize the model, and the PI controller coefficient is adjusted in real time according to the battery voltage and charging and discharging current parameters.

[0038] 2. When different batteries are connected to the system and the current command changes, the PI control coefficient in this control scheme can be adjusted accordingly, dynamically following the changes in the state of the control variable, and realizing fast following of any current command within a wide battery voltage range. Compared with the traditional PI control scheme, it adapts to a wider battery voltage range, can maintain excellent dynamic response under any current command, and has higher tracking accuracy for current commands.

[0039] Other features and advantages of the present invention will be set forth in the following description, and part will be apparent from the description, or can be understood by implementation of the present invention. Features and advantages of the present invention can be realized and obtained by the elements and combinations specifically pointed out in the appended application scope. These and other features of the present invention will become more clearly understood according to the following description and the appended claims, or can be understood by the implementation of the embodiments described in the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 Circuit diagram of a power adaptive control circuit for improving the dynamic performance of a bidirectional Buck-Boost converter.

[0042] Figure 2 Flowchart of a power adaptive control method for improving the dynamic performance of a bidirectional Buck-Boost converter.

[0043] Figure 3 It is a small signal model of a battery charging and discharging system with a bidirectional Buck-Boost converter as its core.

[0044] Figure 4a is the battery voltage V in the embodiment of the present invention bat =350V, the dynamic response waveform of the bidirectional Buck-Boost converter to battery charging and discharging.

[0045] Figure 4bis the battery voltage V in the embodiment of the present invention bat =450V, the dynamic response waveform of the bidirectional Buck-Boost converter to battery charging and discharging.

[0046] Figure 5 The block diagram of the power adaptive control system for the dynamic performance of the bidirectional Buck-Boost converter. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and beneficial technical effect of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining the present invention, not for limiting the present invention.

[0048] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be determined according to the specific circumstances.

[0050] See also Figures 1 to 5 The present invention provides a power adaptive control method for improving the dynamic performance of a (bidirectional Buck-Boost) converter, comprising:

[0051] S1: Based on the switch network average model method, a small signal model of the battery charging and discharging system with a bidirectional Buck-Boost converter as the core is established, and the duty cycle modulation signal d is derived to the battery charging and discharging current I bat The transfer function G di (s);

[0052] S2: Let s = 0 and extract the transfer function G di (s) and the battery voltage V bat and the battery current I bat The DC gain part G di0, and normalize it to get the adaptive PI control function G ic (s);

[0053] S3: Detect the actual voltage V on the battery side of the bidirectional Buck-Boost converter bat and the actual current I of the battery charging and discharging bat ; Using the actual voltage V bat and the actual current I bat Input to the adaptive PI control function G ic (s) Get the adaptive PI control function G in the current control beat ic (s) K p and K i The coefficient value of

[0054] S4: Set the current command I ref and the actual detected battery current I bat The current error signal e is obtained by subtracting i And input into S3 to obtain the adaptive PI control function G ic (s) obtaining a corresponding duty cycle modulation signal d;

[0055] S5: The duty cycle modulation signal d is used to generate a driving pulse signal through the PWM modulation module to control the on and off of the main power switch device, thereby realizing the battery charging and discharging current instruction I ref Fast follow response.

[0056] In a preferred embodiment, the transfer function G in step S1 is di (s) is:

[0057]

[0058] In the above formula (1), T s is the switching period, V bat is the battery voltage, I bat is the battery current, R bat is the internal resistance of the connected battery, V in is the input bus voltage.

[0059] In a preferred embodiment, the step S2 described in step S2 and the battery voltage V bat and the battery current I bat The DC gain part G di0 for:

[0060]

[0061] The adaptive PI control function G described in step S2 ic (s) The structure is:

[0062]

[0063] In a preferred embodiment, the adaptive PI control function G in step S3 ic (s) K p , K i The coefficient values ​​are:

[0064]

[0065] In a preferred embodiment, the step S4 comprises:

[0066] S41: The control instruction value I ref With the feedback signal I bat The current error signal e is obtained by subtracting i , e i =I ref -I bat ;

[0067] S42: The error signal e i Input to the adaptive PI function G ic (s) obtains the duty cycle modulation signal d.

[0068] Specifically, the step S42 further includes:

[0069] The current error signal e i Input adaptive PI function G ic (s) After processing, according to the battery voltage V bat and current I bat Dynamically adjust its coefficient K p and K i ;PI function G ic The duty cycle modulation signal d output by (s) is PWM modulated to generate the driving signals of the MOS tubes Q1 and Q2 of the bidirectional Buck-Boost converter. The driving signals are sent to the gates of the MOS tubes Q1 and Q2 to control the switching of the MOS tubes Q1 and Q2 according to a preset rule, thereby achieving excellent dynamic performance within the full load range.

[0070] Finally, a bidirectional Buck-Boost converter charging and discharging operation platform was built through the PLECS simulation platform. The parameters are as shown in the above example. When the battery voltage V bat =350V, the system's dynamic response waveform is as follows Figure 4a As shown, specifically including the inductor current i L , battery current I bat And the battery voltage V bat . By the current iL The enlarged waveform shows that the converter is working in the current discontinuous mode. ref When switching from 10A to 20A, the battery current response time is about 1.4ms, and there is no overshoot. The current command I ref When switching from 20A to 10A, the current response time is about 1.5ms, and there is no overshoot. bat =450V, the system's dynamic response waveform is as follows Figure 4b As shown, at this time the current command I ref When switching from 10A to 20A, the battery current response time is about 1.9ms, and there is no overshoot. The current command I ref When switching from 20A to 10A, the current response time is about 1.8ms without overshoot.

[0071] Combination Figure 4a and Figure 4b According to the results in FIG. 1 , when the battery voltage fluctuates from 350 V to 450 V, the power adaptive self-adaptive PI control algorithm proposed in the present invention can ensure that the dynamic response of the system is within 2 ms without overshoot.

[0072] The present invention also provides a power adaptive control circuit for improving the dynamic performance of a bidirectional Buck-Boost converter, comprising: a DC power supply, a half-bridge bidirectional Buck-Boost conversion circuit module, a battery and a control unit; the DC power supply is electrically connected to the half-bridge bidirectional Buck-Boost conversion circuit module, the half-bridge bidirectional Buck-Boost conversion circuit module is electrically connected to the battery and the control unit, and the battery is electrically connected to the control unit.

[0073] Specifically, the half-bridge bidirectional Buck-Boost conversion circuit module includes a capacitor C1, a MOS tube Q1, a MOS tube Q2, a power inductor L1, a power inductor L2 and a filter capacitor C f One end of the capacitor C1 is electrically connected to the positive electrode of the DC power supply and the drain of the MOS tube Q1, the other end of the capacitor C1 is electrically connected to the negative electrode of the DC power supply and the source of the MOS tube Q2, the source of the MOS tube Q1 is electrically connected to the drain of the MOS tube Q2 and one end of the power inductor L1, and the other end of the power inductor L1 is electrically connected to the filter capacitor C f The positive electrode of the battery is electrically connected, the source of the MOS tube Q2 is electrically connected to one end of the power inductor L2, and the other end of the power inductor L2 is electrically connected to the filter capacitor C f Electrically connected to the negative terminal of the battery.

[0074] Specifically, the control unit includes a battery voltage filter capacitor G f (s) and battery current regulator G ic(s), the battery voltage filter capacitor G f (s) is electrically connected to the battery, the battery current regulator G ic (s) and battery voltage filter capacitor G f (s) is electrically connected to the positive electrode of the battery, and the battery current regulator G ic (s) is also electrically connected to the gate of the MOS transistor Q1 and the gate of the MOS transistor Q2.

[0075] According to another aspect of the present invention, Figure 5 As shown, a power adaptive control system for improving the dynamic performance of a bidirectional Buck-Boost converter is provided, comprising: a detection module 501, a differential module 502, an input module 503 and a control module 504, wherein the detection module 501, the differential module 502, the input module 503 and the control module 504 are electrically connected to each other;

[0076] Detection module 501, used to detect the battery voltage V in the bidirectional Buck-Boost converter charging and discharging device bat And the battery current I bat ; The actual battery voltage V bat and the battery current I bat Input to the calculation module to calculate the adaptive PI function G ic (s), the battery current I bat Input to the difference module;

[0077] The difference module 502 is used to convert the reference output current I ref and the battery current I bat The current error signal e is obtained by subtracting i ;

[0078] Calculation module 503, used to calculate the adaptive PI function G ic The coefficient value K of (s) p and K i ;

[0079] The control module 504 is used to obtain a corresponding driving pulse signal using the duty cycle modulation signal d to implement the battery charging and discharging current instruction I ref Fast follow response.

[0080] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. The computer program is executed by a processor to implement the steps of a power adaptive control method for improving the dynamic performance of a bidirectional Buck-Boost converter.

[0081] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0082] In particular, according to some embodiments of the present disclosure, the process described above can be implemented as a computer software program. For example, some embodiments of the present disclosure include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In some such embodiments, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device, or installed from a ROM. When the computer program is executed by a processing device, the above-mentioned functions defined in the method of some embodiments of the present disclosure are executed.

[0083] It should be noted that the computer-readable medium recorded in some embodiments of the present disclosure may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In some embodiments of the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In some embodiments of the present disclosure, a computer-readable signal medium may include a mission data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated mission data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0084] In some embodiments, the client and the server may communicate using any currently known or future developed network protocol such as HTTP (HyperTextTransferProtocol), and may be interconnected with any form or medium of digital task data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), an internet (e.g., the Internet), and a peer-to-peer network (e.g., an adhoc peer-to-peer network), as well as any currently known or future developed network.

[0085] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device. The computer-readable medium carries one or more programs. When the one or more programs are executed by the electronic device, the electronic device: in response to detecting a query operation on a production collaboration document in a switch production line management application, determines the network connection status of the switch production line management application; in response to determining that the network connection status of the switch production line management application represents an offline state, replaces the web page entry information corresponding to the production collaboration document with target entry file information, and loads target web page resource information to display the web page of the production collaboration document offline in the switch production line management application, wherein the target entry file information is file information of a pre-downloaded entry file corresponding to the web page of the production collaboration document, and the target web page resource information is locally stored resource information corresponding to the web page; in response to determining that the network connection status of the switch production line management application represents an online state, and the web page resource information corresponding to the production collaboration document is not stored locally, downloads the web page resource information of the web page from the production line document server, wherein the web page resource information includes an entry file and resource information; according to the web page resource information, displays the web page of the production collaboration document in the switch production line management application, and stores the web page resource information in a local database.

[0086] Computer program code for performing the operations of some embodiments of the present disclosure may be written in one or more programming languages ​​or a combination thereof, including product-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0087] The present invention is not limited to what is described in the specification and implementation modes, and therefore additional advantages and modifications can be easily realized by those skilled in the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrative examples shown and described herein.

Claims

1. A power adaptive control method for improving the dynamic performance of a converter, characterized in that: include: S1: Based on the switch network average model method, a small signal model of the battery charging and discharging system with a bidirectional Buck-Boost converter as the core is established, and the duty cycle modulation signal d is derived to the battery charging and discharging current I bat The transfer function G di (s); S2: Let s = 0 and extract the transfer function G di (s) and the battery voltage V bat and the battery current I bat The DC gain part G di0 , and normalize it to get the adaptive PI control function G ic (s); S3: Detect the actual voltage V on the battery side of the bidirectional Buck-Boost converter bat and the actual current I of the battery charging and discharging bat ; Using the actual voltage V bat and the actual current I bat Input to the adaptive PI control function G ic (s) Get the adaptive PI control function G in the current control beat ic (s) K p and K i The coefficient value of S4: Set the current command I ref and the actual detected battery current I bat The current error signal e is obtained by subtracting i And input into S3 to obtain the adaptive PI control function G ic (s) obtaining a corresponding duty cycle modulation signal d; S5: The duty cycle modulation signal d is used to generate a driving pulse signal through the PWM modulation module to control the on and off of the main power switch device, thereby realizing the battery charging and discharging current instruction I ref Fast follow response.

2. The power adaptive control method for improving the dynamic performance of the converter according to claim 1, characterized in that: The transfer function G described in step S1 di (s) is: In the above formula (1), T s is the switching period, V bat is the battery voltage, I bat is the battery current, R bat is the internal resistance of the connected battery, V in is the input bus voltage.

3. The power adaptive control method for improving the dynamic performance of a converter according to claim 1, characterized in that: The step S2 is described with the battery voltage V bat and the battery current I bat The DC gain part G di0 for: The adaptive PI control function G described in step S2 ic (s) The structure is:

4. The power adaptive control method for improving the dynamic performance of a converter according to claim 1, characterized in that: The adaptive PI control function G in step S3 ic (s) K p , K i The coefficient values ​​are:

5. The power adaptive control method for improving the dynamic performance of a converter according to claim 1, characterized in that: The step S4 comprises: S41: The control instruction value I ref With the feedback signal I bat The current error signal e is obtained by subtracting i , e i =I ref -I bat ; S42: The current error signal e i Input adaptive PI function G ic (s), according to the battery voltage V bat and current I bat Dynamically adjust its coefficient K p and K i ;PI function G ic The duty cycle modulation signal d output by (s) is modulated by PWM to generate the driving signal of the MOS tubes Q1 and MOSQ2 of the bidirectional Buck-Boost converter. The driving signal is used to control the on and off of the MOS tubes Q1 and Q2.

6. A circuit for a power adaptive control method for improving the dynamic performance of a converter as claimed in any one of claims 1 to 5, characterized in that: include: A DC power supply, a half-bridge bidirectional Buck-Boost conversion circuit module, a battery and a control unit; the DC power supply is electrically connected to the half-bridge bidirectional Buck-Boost conversion circuit module, the half-bridge bidirectional Buck-Boost conversion circuit module is electrically connected to the battery and the control unit, and the battery is electrically connected to the control unit.

7. The circuit of the power adaptive control method for improving the dynamic performance of the converter as claimed in claim 6, characterized in that: The half-bridge bidirectional Buck-Boost conversion circuit module includes a capacitor C1, a MOS tube Q1, a MOS tube Q2, a power inductor L1, a power inductor L2 and a filter capacitor C f One end of the capacitor C1 is electrically connected to the positive electrode of the DC power supply and the drain of the MOS tube Q1, the other end of the capacitor C1 is electrically connected to the negative electrode of the DC power supply and the source of the MOS tube Q2, the source of the MOS tube Q1 is electrically connected to the drain of the MOS tube Q2 and one end of the power inductor L1, and the other end of the power inductor L1 is electrically connected to the filter capacitor C f The positive electrode of the battery is electrically connected, the source of the MOS tube Q2 is electrically connected to one end of the power inductor L2, and the other end of the power inductor L2 is electrically connected to the filter capacitor C f Electrically connected to the negative terminal of the battery.

8. The circuit of the power adaptive control method for improving the dynamic performance of the converter as claimed in claim 7, characterized in that: The control unit includes a battery voltage filter capacitor G f (s) and battery current regulator G ic (s), the battery voltage filter capacitor G f (s) is electrically connected to the battery, the battery current regulator G ic (s) and battery voltage filter capacitor G f (s) is electrically connected to the positive electrode of the battery, and the battery current regulator G ic (s) is also electrically connected to the gate of the MOS tube Q1 and the gate of the MOS tube Q2 through a PWM modulation module.

9. A system for a power adaptive control method for improving the dynamic performance of a converter as claimed in any one of claims 1 to 5, characterized in that: include: A detection module (501), a differential module (502), an input module (503) and a control module (504), wherein the detection module (501), the differential module (502), the input module (503) and the control module (504) are electrically connected to each other; A detection module (501) is used to detect the battery voltage V in the bidirectional Buck-Boost converter charging and discharging device. bat And the battery current I bat ; The actual battery voltage V bat and the battery current I bat Input to the calculation module to calculate the adaptive PI function G ic (s), the battery current I bat Input to the difference module; A difference module (502) is used to convert the reference output current I ref and the battery current I bat The current error signal e is obtained by subtracting i ; A calculation module (503) is used to calculate the adaptive PI function G ic The coefficient value K of (s) p and K i ; The control module (504) is used to obtain a corresponding driving pulse signal using the duty cycle modulation signal d to implement the battery charging and discharging current instruction I ref Fast follow response.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the power adaptive control method for improving the dynamic performance of the converter as described in any one of claims 1 to 5 are implemented.

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