DC converter switching control method, system and equipment

Abstract

The invention belongs to the field of direct-current converter switching control, and particularly relates to a direct-current converter switching control method, system and equipment, and the method comprises the steps: building a direct-current converter switching control system suitable for boost chopping according to a circuit topology equation of a direct-current converter; constructing a switching mechanism depending on the residence time, and setting a residence time constraint condition; based on the state of the DC converter switching control system, introducing an undisturbed switching performance index to obtain an undisturbed switching mechanism; determining an event triggering sampling mechanism; obtaining an undisturbed switching event triggering control scheme based on an undisturbed switching mechanism and an event triggering sampling mechanism; and determining an undisturbed switching event trigger controller parameter according to a dwell time dependent switching mechanism and an undisturbed switching event trigger control scheme. According to the invention, the dynamic difference of the DC converter in different working states can be effectively handled, and more accurate and flexible control is realized.

Description

Technical Field

[0001] This invention belongs to the field of DC-DC converter switching control, and specifically relates to a DC-DC converter switching control method, system and device. Background Technology

[0002] DC-DC converter control technology is widely used in various power conversion systems, and its control performance has a significant impact on the safe and stable operation of the power system. As a key component of modern power systems, DC-DC converters need to adapt to various operating states during actual operation, and their dynamic characteristics are directly related to the system's operational reliability and energy utilization efficiency.

[0003] However, due to factors such as circuit nonlinearity, parameter uncertainty, and operational constraints, DC-DC converters exhibit significant dynamic differences under different operating modes. Existing DC-DC converter control methods based on a single control strategy are difficult to meet the control performance requirements under various operating conditions.

[0004] Especially in modern power systems, more precise and flexible regulation is often required to improve the output voltage and current response of converters and enhance their operational stability. Existing technologies cannot ensure the safety of power systems and have low energy utilization efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a method, system, and device for switching control of a DC-DC converter.

[0006] A DC-DC converter switching control method includes the following steps: S1. Based on the KCL equations of the DC-DC converter topology, establish the switching control system of the DC-DC converter; S2. Based on the state changes of the switching control system, construct a switching mechanism; S3. Based on the state of the switching control system, introduce disturbance-free switching constraints to limit sudden changes in control input, and obtain the disturbance-free switching mechanism. S4. Based on the switching mechanism and the non-disruptive switching mechanism, determine the event-triggered sampling mechanism. Based on the non-disruptive switching mechanism and the event-triggered sampling mechanism, obtain the state sample value of the switching control system. Based on the state sample value of the switching control system, obtain the non-disruptive switching event-triggered controller. S5. Incorporate the disturbance-free switching event trigger controller into the switching control system to obtain a closed-loop control system; S6. Based on the closed-loop control system, switching mechanism, and bumpless switching event trigger controller, determine the parameters of the bumpless switching event trigger controller.

[0007] In S4, based on the handover mechanism and the disturbance-free handover mechanism, the event triggering sampling mechanism is determined. The specific operation is as follows: Define To trigger the sampling sequence, The sampling time is defined as k, where k is the kth sampling time. It is the set of natural numbers, and the sequence of trigger sampling times is strictly increasing. And the next trigger sampling time for: , in, This indicates the state sampling error of the switching control system. This represents the state sample value of the switching control system at time t. Indicates the sampling time triggered by the most recent event. The obtained state sample values ​​of the switching control system; For the given maximum trigger time interval; This is the event trigger threshold; For controller mode The corresponding positive definite weight matrix, Indicates a switching signal. Indicates controller mode. for or , and They represent the first and the One controller, It is the system uptime. It represents the infimum of a set.

[0008] Based on the state sampling values ​​of the switching control system in S4, a disturbance-free switching event trigger controller is obtained. The specific operation is as follows: , in, It is the control input of the bumpless switching event trigger controller. It is the system uptime. Indicates the sampling time triggered by the most recent event. The obtained state sample values ​​of the switching control system; To trigger the sampling time, For the next trigger sampling time; Indicates in The constantly updated, seamless switching event triggers the controller's control input; It is to be designed, and the controller pattern The corresponding controller gain matrix.

[0009] In S6, based on the closed-loop control system, switching mechanism, and bumpless switching event-triggered controller, the parameters of the bumpless switching event-triggered controller are determined. The specific method is as follows: When switching signals When, define a given constant matrix. ; in, Indicates the first Subsystems and Indicates the first The system matrix of each subsystem; When controller mode When, define , ; Among them, the first of the subscripts Indicates the first Subsystem, the second one in the subscript Indicates the first One controller mode; When controller mode When, define , , Among them, the first of the subscripts Indicates the first Subsystem, the second one in the subscript Indicates the first One controller mode; Solve the following inequalities to obtain the parameters of the bumpless handover event trigger controller: , in, These represent the closed-loop control system at the [number]th [position]. When the controller is in the first subsystem... The first pattern and the first One pattern, An identity matrix consistent with the state dimension of the closed-loop control system. It's about adjusting parameters. It is a positive definite matrix. , It is a positive definite weight matrix. The controller gain matrix is ​​to be determined. It is a virtual control gain matrix. For a given maximum trigger time interval, , , , It is the system matrix corresponding to the closed-loop control system in different controller modes. These are constraint parameters.

[0010] In S2, a switching mechanism is constructed based on the state changes of the switching control system. The specific operation is as follows: , Where t1 and t2 represent the start and end times of the switching time interval, respectively. Represents the number of switches within a time interval, a constant. Indicates the initial number of switches. This represents the average dwell time in a particular subsystem.

[0011] The specific steps for establishing a switching control system for the DC-DC converter in S1 are as follows: , in, Indicates the rate of change of the state of the switching control system. This represents the state sample value of the switching control system at time t. It is the control input of the bumpless switching event trigger controller. and Given a constant matrix, It is a switching signal. It is a set of positive integers. The number of subsystems This indicates the running time of the switching control system.

[0012] The bumpless handover mechanism in S3 is as follows: , in, It is a performance indicator of seamless handover. It is a virtual control signal that triggers the controller via a bumpless switching event. This represents the state sample value of the switching control system at time t. It is the control input of the bumpless switching event trigger controller. The Euclidean norm of a vector is denoted by .

[0013] In S5, the disturbance-free switching event trigger controller is incorporated into the switching control system to obtain a closed-loop control system, specifically: , in, Indicates the rate of change of the state of the switching control system. , In order to switch signals The corresponding known constant matrix below, This represents the state sample value of the switching control system at time t. The control input for the controller is to trigger a bumpless switching event. Indicates the sampling time triggered by the most recent event. The obtained state sample values ​​of the switching control system It is the design and controller pattern The corresponding controller gain.

[0014] A DC-DC converter switching control system, used to implement the aforementioned DC-DC converter switching control method, includes: The switching control system acquisition module establishes the switching control system of the DC-DC converter based on the KCL equations of the DC-DC converter topology. The switching mechanism acquisition module constructs the switching mechanism based on the state changes of the switching control system. The bumpless switching mechanism acquisition module, based on the state of the switching control system, introduces bumpless switching constraints to limit sudden changes in control input, and obtains the bumpless switching mechanism. The module for acquiring the event-triggered controller for seamless handover determines the event-triggered sampling mechanism based on the handover mechanism and the seamless handover mechanism. Based on the seamless handover mechanism and the event-triggered sampling mechanism, it obtains the state sample value of the handover control system. Based on the state sample value of the handover control system, it obtains the event-triggered controller for seamless handover. The closed-loop control system acquisition module inputs the disturbance-free switching event trigger controller into the switching control system to obtain the closed-loop control system. The parameter acquisition module determines the parameters of the disturbance-free switching event trigger controller based on the closed-loop control system, the switching mechanism, and the disturbance-free switching event trigger controller.

[0015] A DC-DC converter switching control device includes a processor and a memory, wherein the processor executes a computer program stored in the memory to implement the DC-DC converter switching control method.

[0016] Through the above design, the beneficial effects of this invention are as follows: The introduction of DC-DC converter switching control technology enables the system to effectively cope with the dynamic differences of the DC-DC converter under different operating states, achieving more precise and flexible control. This technology can adjust the control strategy in real time according to changes in the converter's state, thereby ensuring stable and efficient operation under various load conditions and environmental changes.

[0017] Furthermore, this switching control technology significantly improves the response capability of the DC-DC converter, enabling it to react quickly to load changes or input voltage fluctuations, ensuring the stability of output voltage and current. This not only improves the system's operational stability but also optimizes switching losses, reduces energy waste caused by frequent switching, and thus improves overall power transmission efficiency.

[0018] Especially with the designed switching mechanism, a smooth transition can be achieved between different operating modes, avoiding voltage or current surges that may occur during switching in traditional control methods. This smooth transition reduces switching disturbances between controllers, ensuring that the system does not cause excessive transient responses during frequent state switching, further improving the reliability and long-term stability of the DC-DC converter. Detailed Implementation

[0019] Example To further understand the content of this invention, the invention will be described in detail with reference to the embodiments.

[0020] A DC-DC converter switching control method includes the following steps: S1. Based on the KCL equations of the DC-DC converter topology, establish the switching control system of the DC-DC converter.

[0021] The specific steps for establishing a switching control system for the DC-DC converter in S1 are as follows: , in, Indicates the rate of change of the state of the switching control system. This represents the state sample value of the switching control system at time t. It is the control input of the bumpless switching event trigger controller. and Given a constant matrix, It is a switching signal. It is a set of positive integers. The number of subsystems This indicates the running time of the switching control system.

[0022] The switching time is determined by the switching signal. The jump is determined.

[0023] Specifically, the DC-DC converter switching control system can be further refined as follows: , in, and These are the increments of inductor current and capacitor voltage, respectively. It is the change in the increment of the inductor current. It is the change in the increment of the capacitor voltage; and It also serves as an indication of switching control system states. It is the input voltage of the DC-DC converter, let The switching control system matrix can be parameterized as follows: , , , , in, This is the system matrix.

[0024] S2. Based on the state changes of the switching control system, construct a switching mechanism.

[0025] The specific steps are as follows: , Where t1 and t2 represent the start and end times of the switching time interval, respectively. Represents the number of switches within a time interval, a constant. Indicates the initial number of switches. This represents the average dwell time in a particular subsystem.

[0026] It is usually a constant related to the switching interval. The expression means "for all," that is, the above inequality satisfies for any... Both are true. The switching interval is satisfied. This ensures that the system does not generate excessive operational disturbances when performing a switch.

[0027] For system switching signals, this implementation scheme takes , .

[0028] S3. Based on the state of the switching control system, introduce disturbance-free switching constraints to limit sudden changes in control input, thus obtaining the disturbance-free switching mechanism.

[0029] The bumpless handover mechanism reduces the disturbances caused by the controller switching when a bumpless handover event is triggered. Specifically: , in, It is a performance indicator of seamless handover. It is a virtual control signal that triggers the controller via a bumpless switching event. This represents the state sample value of the switching control system at time t. It is the control input of the bumpless switching event trigger controller. The Euclidean norm of a vector is denoted by .

[0030] , , Indicates the state of the DC-DC converter switching control system. It is the control input of the bumpless switching event trigger controller. It is a virtual control gain. K i It is the gain of the controller triggered by the bumpless switching event. For use as virtual control inputs in analysis and design, To trigger the sampling time, This indicates the status value of the last transmission.

[0031] In this example, the specific parameter can take the following values: The virtual control gain matrix can be, for example, taken as... , The dimension of the system matches the dimension of the system state.

[0032] S4. Based on the switching mechanism and the non-disruptive switching mechanism, determine the event-triggered sampling mechanism. Based on the non-disruptive switching mechanism and the event-triggered sampling mechanism, obtain the state sample value of the switching control system. Based on the state sample value of the switching control system, obtain the non-disruptive switching event-triggered controller.

[0033] Based on the handover mechanism and the disturbanceless handover mechanism, the event triggering sampling mechanism is determined. The specific operation is as follows: Define To trigger the sampling sequence, The sampling time is defined as k, where k is the kth sampling time. It is the set of natural numbers, and the sequence of trigger sampling times is strictly increasing. And the next trigger sampling time for: , in, This indicates the state sampling error of the switching control system. This represents the state sample value of the switching control system at time t. Indicates the sampling time triggered by the most recent event. The obtained state sample values ​​of the switching control system; For the given maximum trigger time interval; This is the event trigger threshold; For controller mode The corresponding positive definite weight matrix, Indicates a switching signal. This indicates the controller mode; therefore, asynchronous switching may occur between the control system and the controller. for or , and They represent the first and the One controller, It is the system uptime. Let represent the infimum of the set, that is, the smallest lower bound in time that satisfies the triggering condition. In this formula... This means that the value is the minimum value of the set listed within the curly braces.

[0034] State sample values ​​are obtained using the designed event-triggered sampling mechanism. For the next step of controller design, in this example implementation, the specific parameters can be taken as follows: =0.1, .

[0035] Based on the event-triggered sampling mechanism and the disturbance-free handover condition, the state sample value is calculated, and the disturbance-free handover event-triggered controller is: , in, It is the control input of the bumpless switching event trigger controller. It is the system uptime. Indicates the sampling time triggered by the most recent event. The obtained state sample values ​​of the switching control system; To trigger the sampling time, For the next trigger sampling time; Indicates in The constantly updated, seamless switching event triggers the controller's control input; It is to be designed, and the controller pattern The corresponding controller gain matrix.

[0036] Switching signal with switching control system They may be out of sync. This indicates that the trigger time lags behind the switching time, the controller mode has not been updated, and the switching control system starts from the [previous stage]. The subsystem switches to the first The subsystem, the controller is still in the first stage. Subsystems.

[0037] S5. Integrate the disturbance-free switching event trigger controller into the switching control system to obtain a closed-loop control system.

[0038] Specifically: , in, Indicates the rate of change of the state of the switching control system. , In order to switch signals The corresponding known constant matrix below, This represents the state sample value of the switching control system at time t. The control input for the controller is to trigger a bumpless switching event. Indicates the sampling time triggered by the most recent event. The obtained state sample values ​​of the switching control system It is the design and controller pattern The corresponding controller gain.

[0039] State sampling error defined by the DC-DC converter switching control system The closed-loop system can be further expressed as follows: , Further define the matrix of the composite closed-loop system: , Among them, subscript This indicates a combination of system switching mode and controller switching mode.

[0040] The closed-loop system model can then be written as: , in It is the design and controller pattern Controller gain, This indicates a controller switching signal, because Only at the time of triggering sampling Updates may occur asynchronously, as the subsystem and its corresponding controller may not update simultaneously. This indicates the state sampling error of the DC-DC converter switching control system. , This represents the system matrix in a closed-loop system.

[0041] when When, define , and Indicates the first The system matrix of each subsystem. When When, define , ;when When, define The first subscript Indicates the controller mode index, the second subscript This represents the index of a system subsystem. A closed-loop system is modeled in the following form; .

[0042] S6. Based on the closed-loop control system, switching mechanism, and bumpless switching event trigger controller, determine the parameters of the bumpless switching event trigger controller.

[0043] When switching signals When, define a given constant matrix. ; in, Indicates the first Subsystems and Indicates the first The system matrix of each subsystem; When controller mode When, define , ; Among them, the first of the subscripts Indicates the first Subsystem, the second one in the subscript Indicates the first One controller mode; When controller mode When, define , , Among them, the first of the subscripts Indicates the first Subsystem, the second one in the subscript Indicates the first One controller mode; To ensure the following inequality holds, solve the following inequality to obtain the parameters of the bumpless handover event trigger controller: , , , , , in, These represent the closed-loop control system at the [number]th [position]. When the controller is in the first subsystem... The first pattern and the first One pattern, The identity matrix is ​​consistent with the state dimension of the closed-loop control system. Therefore, the term "closed-loop control system" will also refer to a switching control system thereafter. It's about adjusting parameters. It is a positive definite matrix. , It is a positive definite weight matrix. The controller gain matrix is ​​to be determined. It is a virtual control gain matrix. For a given maximum trigger time interval, , , , It is the system matrix corresponding to the closed-loop control system in different controller modes. These are constraint parameters.

[0044] This indicates a closed-loop control system. This indicates that the controller is triggered by a disturbance-free switching event. This indicates the switching mechanism.

[0045] Solving symmetric matrices , and matrix , And select positive numbers , , , , , For any The above nonlinearity is transformed into a linear inequality, which facilitates calculation and solution: , , , , in, It is a positive definite adjustment matrix; a constant. It refers to adjusting parameters; , It is a positive definite weight matrix; It is a positive number; This is the system matrix corresponding to the i-th subsystem; An identity matrix that matches the system dimension; , and , These are the decision matrices introduced in the system-controller synchronous switching mode and the asynchronous switching mode, respectively; This represents the subsystem index set.

[0046] In this implementation, let the subsystem index set be... ,Right now The deviation of the system's initial state from its steady-state operating point is selected as... Based on the data given above, we can obtain: , , , Control gain It is given by the following formula: , .

[0047] A DC-DC converter switching control system, used to implement the aforementioned DC-DC converter switching control method, includes: The switching control system acquisition module establishes the switching control system of the DC-DC converter based on the KCL equations of the DC-DC converter topology. The switching mechanism acquisition module constructs the switching mechanism based on the state changes of the switching control system. The bumpless switching mechanism acquisition module, based on the state of the switching control system, introduces bumpless switching constraints to limit sudden changes in control input, and obtains the bumpless switching mechanism. The module for acquiring the event-triggered controller for seamless handover determines the event-triggered sampling mechanism based on the handover mechanism and the seamless handover mechanism. Based on the seamless handover mechanism and the event-triggered sampling mechanism, it obtains the state sample value of the handover control system. Based on the state sample value of the handover control system, it obtains the event-triggered controller for seamless handover. The closed-loop control system acquisition module inputs the disturbance-free switching event trigger controller into the switching control system to obtain the closed-loop control system. The parameter acquisition module determines the parameters of the disturbance-free switching event trigger controller based on the closed-loop control system, the switching mechanism, and the disturbance-free switching event trigger controller.

[0048] A DC-DC converter switching control device includes a processor and a memory, wherein the processor executes a computer program stored in the memory to implement the DC-DC converter switching control method.

[0049] Through the above design, the beneficial effects of this invention are as follows: The introduction of DC-DC converter switching control technology enables the system to effectively cope with the dynamic differences of the DC-DC converter under different operating states, achieving more precise and flexible control. This technology can adjust the control strategy in real time according to changes in the converter's state, thereby ensuring stable and efficient operation under various load conditions and environmental changes.

Claims

1. A switching control method for a DC-DC converter, characterized in that, Includes the following steps: S1. Based on the KCL equations of the DC-DC converter topology, establish the switching control system of the DC-DC converter; S2. Based on the state changes of the switching control system, construct a switching mechanism; S3. Based on the state of the switching control system, introduce disturbance-free switching constraints to limit sudden changes in control input, and obtain the disturbance-free switching mechanism. S4. Based on the switching mechanism and the non-disruptive switching mechanism, determine the event-triggered sampling mechanism. Based on the non-disruptive switching mechanism and the event-triggered sampling mechanism, obtain the state sample value of the switching control system. Based on the state sample value of the switching control system, obtain the non-disruptive switching event-triggered controller. S5. Incorporate the disturbance-free switching event trigger controller into the switching control system to obtain a closed-loop control system; S6. Based on the closed-loop control system, switching mechanism, and bumpless switching event trigger controller, determine the parameters of the bumpless switching event trigger controller.

2. The method according to claim 1, characterized in that, In S4, based on the handover mechanism and the disturbance-free handover mechanism, the event triggering sampling mechanism is determined. The specific operation is as follows: Define To trigger the sampling sequence, The sampling time is defined as k, where k is the kth sampling time. It is the set of natural numbers, and the sequence of trigger sampling times is strictly increasing. And the next trigger sampling time for: , in, This indicates the state sampling error of the switching control system. This represents the state sample value of the switching control system at time t. Indicates the sampling time triggered by the most recent event. The obtained state sample values ​​of the switching control system; The maximum trigger time interval is given. The event trigger threshold; For controller mode The corresponding positive definite weight matrix, Indicates a switching signal. Indicates controller mode. for or , and They represent the first and the One controller, It is the system uptime. It represents the infimum of a set.

3. The method according to claim 1, characterized in that, Based on the state sampling values ​​of the switching control system in S4, a disturbance-free switching event trigger controller is obtained. The specific operation is as follows: ， in, It is the control input of the bumpless switching event trigger controller. It is the system uptime. Indicates the sampling time triggered by the most recent event. The obtained state sample values ​​of the switching control system; To trigger the sampling time, For the next trigger sampling time; Indicates in The constantly updated, seamless switching event triggers the controller's control input; It is to be designed, and the controller pattern The corresponding controller gain matrix.

4. The method according to claim 1, characterized in that, In S6, based on the closed-loop control system, switching mechanism, and bumpless switching event-triggered controller, the parameters of the bumpless switching event-triggered controller are determined. The specific method is as follows: When switching signals When, define a given constant matrix. ; in, Indicates the first Subsystems and Indicates the first The system matrix of each subsystem; When controller mode When, define , ; Among them, subscript Indicates the first Subsystems, in subscript Indicates the first One controller mode; When controller mode When, define , , Among them, the first of the subscripts Indicates the first Subsystem, the second one in the subscript Indicates the first One controller mode; Solve the following inequalities to obtain the parameters of the bumpless handover event trigger controller: ， ， ， ， ， in, These represent the closed-loop control system at the [number]th [position]. When the controller is in the first subsystem... The first pattern and the first One pattern, An identity matrix consistent with the state dimension of the closed-loop control system. It's about adjusting parameters. It is a positive definite matrix. , It is a positive definite weight matrix. The controller gain matrix is ​​to be determined. It is a virtual control gain matrix. For a given maximum trigger time interval, , , , It is the system matrix corresponding to the closed-loop control system in different controller modes. These are constraint parameters.

5. The method according to claim 1, characterized in that, In S2, a switching mechanism is constructed based on the state changes of the switching control system. The specific operation is as follows: , Where t1 and t2 represent the start and end times of the switching time interval, respectively. Represents the number of switches within a time interval, a constant. Indicates the initial number of switches. This represents the average dwell time in a particular subsystem.

6. The method according to claim 1, characterized in that, The specific steps for establishing a switching control system for the DC-DC converter in S1 are as follows: , in, Indicates the rate of change of the state of the switching control system. This represents the state sample value of the switching control system at time t. It is the control input of the bumpless switching event trigger controller. and Given a constant matrix, It is a switching signal. It is a set of positive integers. The number of subsystems This indicates the running time of the switching control system.

7. The method according to claim 1, characterized in that, The bumpless handover mechanism in S3 is as follows: , in, It is a performance indicator for seamless handover. It is a virtual control signal that triggers the controller via a bumpless switching event. This represents the state sample value of the switching control system at time t. It is the control input of the bumpless switching event trigger controller. The Euclidean norm of a vector is denoted by .

8. The method according to claim 1, characterized in that, In S5, the disturbance-free switching event trigger controller is incorporated into the switching control system to obtain a closed-loop control system, specifically: , in, Indicates the rate of change of the state of the switching control system. , In order to switch signals The corresponding known constant matrix below, This represents the state sample value of the switching control system at time t. The control input for the controller is to trigger a bumpless switching event. Indicates the sampling time triggered by the most recent event. The obtained state sample values ​​of the switching control system It is the design and controller pattern The corresponding controller gain.

9. A DC-DC converter switching control system, used to implement the DC-DC converter switching control method according to any one of claims 1-8, characterized in that, include: The switching control system acquisition module establishes the switching control system of the DC-DC converter based on the KCL equations of the DC-DC converter topology. The switching mechanism acquisition module constructs the switching mechanism based on the state changes of the switching control system. The bumpless switching mechanism acquisition module, based on the state of the switching control system, introduces bumpless switching constraints to limit sudden changes in control input, and obtains the bumpless switching mechanism. The module for acquiring the event-triggered controller for seamless handover determines the event-triggered sampling mechanism based on the handover mechanism and the seamless handover mechanism. Based on the seamless handover mechanism and the event-triggered sampling mechanism, it obtains the state sample value of the handover control system. Based on the state sample value of the handover control system, it obtains the event-triggered controller for seamless handover. The closed-loop control system acquisition module inputs the disturbance-free switching event trigger controller into the switching control system to obtain the closed-loop control system. The parameter acquisition module determines the parameters of the disturbance-free switching event trigger controller based on the closed-loop control system, the switching mechanism, and the disturbance-free switching event trigger controller.

10. A DC-DC converter switching control device, characterized in that, It includes a processor and a memory, wherein the processor executes a computer program stored in the memory to implement a DC-DC converter switching control method as described in any one of claims 1-8.

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