阅读说明：本技术 谐振型dc-dc变换器高抗扰快响应控制系统及方法 (High-disturbance-rejection fast-response control system and method for resonant DC-DC converter ) 是由 段彬 白浩 张承慧 宋金秋 杨东江 苏祺钧 于 2020-04-27 设计创作，主要内容包括：本公开提供了一种谐振型DC-DC变换器高抗扰快响应控制系统及方法,属于高效功率变换系统先进控制技术领域,包括跟踪微分器、线性扩张状态观测器和滑膜控制器；跟踪微分器根据接收到的电压参考信号输出跟踪信号、一阶和二阶微分信号,线性扩张状态观测器根据接收到的信号,得到第一、第二估计状态和估计扰动,进而得到第一和第二误差信号；所述滑膜控制器根据预设滑膜控制律以及接收到的第一误差信号、第二误差信号、二阶微分信号和估计的总扰动输出控制信号,经过驱动发生器产生PWM驱动信号,驱动变换器的开关管的动作；本公开兼有自抗扰控制的高抗扰特性和滑模控制的快动态响应特性,能有效缓解传统滑模控制易引起的抖振问题。(The invention provides a high-disturbance-rejection fast-response control system and a high-disturbance-rejection fast-response control method for a resonant DC-DC converter, which belong to the technical field of advanced control of high-efficiency power conversion systems and comprise a tracking differentiator, a linear expansion state observer and a synovial membrane controller; the tracking differentiator outputs a tracking signal and first and second order differential signals according to the received voltage reference signal, and the linear extended state observer obtains a first estimation state, a second estimation state and estimation disturbance according to the received signal so as to obtain a first error signal and a second error signal; the sliding mode controller outputs a control signal according to a preset sliding mode control law, a received first error signal, a received second-order differential signal and an estimated total disturbance, and a PWM (pulse-width modulation) driving signal is generated by a driving generator to drive the action of a switching tube of the converter; the method has the high anti-interference characteristic of active anti-interference control and the fast dynamic response characteristic of sliding mode control, and can effectively solve the problem of buffeting easily caused by traditional sliding mode control.)

1. A high-disturbance-rejection fast-response control system of a resonant DC-DC converter is characterized by comprising a tracking differentiator, a linear extended state observer and a synovial controller;

the linear expansion state observer obtains and outputs a first estimation state, a second estimation state and estimation disturbance according to the compensation signal, the control signal output by the response control system and the output voltage of the converter;

obtaining a first error signal according to the output tracking signal and the first estimation state, and obtaining a second error signal according to the first order differential signal and the second estimation state;

and the sliding mode controller outputs a control signal according to a preset sliding mode control law, the received first error signal, the received second-order differential signal and the estimated total disturbance, and a PWM (pulse-width modulation) driving signal is generated by the driving generator to drive the action of a switching tube of the converter.

2. The high-disturbance-rejection fast-response control system of the resonant DC-DC converter of claim 1, wherein the conversion is an LL C resonant converter, a LL C resonant converter model is established by using an extended description function method, and a transfer function between an output voltage and a switching frequency of the model is as follows:

wherein, C_oTo output filter capacitors, R_LAs load, n is transformer transformation ratio, L_rIn order to be a resonant inductor, the inductor,k_fthe slope of the dc voltage gain curve.

3. The high-disturbance-rejection fast-response control system of the resonant DC-DC converter according to claim 1, wherein the compensation signal is obtained by a compensation function constructed according to a converter model, and the compensation function is specifically:

wherein the content of the first and second substances,R_Lis a load, n is a transformer transformation ratio, C_oIn order to output the filter capacitance,L_ris a resonant inductor.

4. The high-disturbance-rejection fast-response control system of the resonant type DC-DC converter according to claim 3, wherein the linear extended state observer is specifically:

wherein, l₁＝3w₀，w₀Is the pole position, z, of the observer characteristic equation₁Is a first estimated state, z₂For the second estimated state, z₃In order to estimate the disturbance,k_fthe slope of the dc voltage gain curve.

5. The high-disturbance-rejection fast-response control system of the resonant type DC-DC converter according to claim 1, wherein the slip film control law is specifically:

wherein, α and β' k are constants larger than 0, p and q are positive odd numbers and q is positive odd number<p<2q，e₂Is the second error, e₁Is the first error, v₃Is a second order differential signal, z₃In order to estimate the disturbance,k_fis the slope of the dc voltage gain curve,n is the transformer transformation ratio, C_oIn order to output the filter capacitance,L_ris a resonant inductance, f₀(z₁,z₂) As a disturbance compensation function, z₁Is a first estimated state, z₂Is the second estimation state.

6. The high-disturbance-rejection fast-response control system of the resonant DC-DC converter according to claim 1, wherein the tracking differentiator is specifically:

wherein v is₁For tracking input signals v, v₂Is a first order differential signal of v, v₃Is a second order differential signal of v, and r is an adjustable parameter.

7. A resonant type DC-DC converter high immunity fast response control system according to claim 1, wherein the estimated total disturbance is a superposition of the estimated disturbance and a compensation function.

8. A high-disturbance-rejection fast-response control method for a resonant DC-DC converter is characterized by comprising the following steps:

acquiring a tracking signal, a first order differential signal and a second order differential signal according to the received voltage reference signal;

obtaining and outputting a first estimation state, a second estimation state and estimation disturbance according to the compensation signal, a control signal output by the response control system and the output voltage of the converter;

obtaining a first error signal according to the output tracking signal and the first estimation state, and obtaining a second error signal according to the first order differential signal and the second estimation state;

and outputting a control signal according to a preset sliding mode control law, the received first error signal, the received second-order differential signal and the estimated total disturbance.

9. The method according to claim 8, wherein the compensation signal is obtained from a compensation function constructed according to a converter model, and the compensation function is specifically:

wherein the content of the first and second substances,R_Lis a load, n is a transformer transformation ratio, C_oIn order to output the filter capacitance,L_ris a resonant inductor;

alternatively, the first and second electrodes may be,

the synovial membrane control law specifically comprises the following steps:

wherein, α and β' k are constants larger than 0, p and q are positive odd numbers and q is positive odd number<p<2q，e₂Is the second error, e₁Is the first error, v₃Is a second order differential signal, z₃In order to estimate the disturbance,k_fis the slope of the dc voltage gain curve,n is the transformer transformation ratio, C_oIn order to output the filter capacitance,L_ris a resonant inductance, f₀(z₁,z₂) As a disturbance compensation function, z₁Is a first estimated state, z₂Is a second estimated state;

alternatively, the first and second electrodes may be,

acquiring a tracking signal, a first order differential signal and a second order differential signal according to the received voltage reference signal, specifically:

wherein v is₁For tracking input signals v, v₂Is a first order differential signal of v, v₃Is a second order differential signal of v, and r is an adjustable parameter;

alternatively, the first and second electrodes may be,

the estimated total disturbance is a superposition of the estimated disturbance and a compensation function.

10. An electronic device comprising the resonance type DC-DC converter high-immunity fast-response control system according to any one of claims 1 to 7.

Technical Field

The disclosure relates to the technical field of advanced control of high-efficiency power conversion systems, and in particular relates to a high-disturbance-rejection fast-response control system and method for a resonant DC-DC converter.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The LL C type resonant DC-DC converter has wide soft switching range, low switching loss and large output voltage range, is easy to realize the magnetic integration of a resonant inductor and a transformer, and becomes a research and application hotspot.

The charging system of the electric vehicle generally comprises AC-DC and DC-DC, wherein the DC-DC converter is directly connected with the power battery of the vehicle, and the DC-DC converter is required to have fast output response and accurate control due to the large difference between the capacity of the power battery and the charging power.

The inventor of the present disclosure finds that, although the LL C resonant converter has the above advantages, due to the existence of a plurality of resonant elements, the operation process is complex, the voltage gain nonlinearity is strong, the order of the mathematical model is high, so that the accurate model is difficult to establish, and meanwhile, the model is susceptible to disturbance influences such as input voltage fluctuation, resonant element parameter drift, load change and the like, so that the model is time-varying and the accurate control is difficult.

Disclosure of Invention

In order to solve the defects of the prior art, the disclosure provides a high-disturbance-rejection and fast-response control system and method for a resonant DC-DC converter, which have the high-disturbance-rejection characteristic of active disturbance rejection control and the fast dynamic response characteristic of sliding mode control, have a fast and accurate control effect, and can effectively alleviate the problem of buffeting easily caused by traditional sliding mode control.

In order to achieve the purpose, the following technical scheme is adopted in the disclosure:

the first aspect of the disclosure provides a high-disturbance-rejection fast-response control system for a resonant type DC-DC converter.

A high-disturbance-rejection fast-response control system of a resonant DC-DC converter comprises a tracking differentiator, a linear extended state observer and a synovial controller;

the linear expansion state observer obtains and outputs a first estimation state, a second estimation state and estimation disturbance according to the compensation signal, the control signal output by the response control system and the output voltage of the converter;

obtaining a first error signal according to the output tracking signal and the first estimation state, and obtaining a second error signal according to the first order differential signal and the second estimation state;

and the sliding mode controller outputs a control signal according to a preset sliding mode control law, the received first error signal, the received second-order differential signal and the estimated total disturbance, and a PWM (pulse-width modulation) driving signal is generated by the driving generator to drive the action of a switching tube of the converter.

The second aspect of the disclosure provides a high-disturbance-rejection fast-response control method for a resonant type DC-DC converter.

A high-disturbance-rejection fast-response control method for a resonance type DC-DC converter comprises the following steps;

acquiring a tracking signal, a first order differential signal and a second order differential signal according to the received voltage reference signal;

obtaining and outputting a first estimation state, a second estimation state and estimation disturbance according to the compensation signal, a control signal output by the response control system and the output voltage of the converter;

obtaining a first error signal according to the output tracking signal and the first estimation state, and obtaining a second error signal according to the first order differential signal and the second estimation state;

and outputting a control signal according to a preset sliding mode control law, the received first error signal, the received second-order differential signal and the estimated total disturbance.

A third aspect of the present disclosure provides an electronic device including the resonant DC-DC converter high-disturbance-rejection fast-response control system according to the first aspect of the present disclosure.

Compared with the prior art, the beneficial effect of this disclosure is:

1. the high-disturbance-rejection fast-response control system and method for the resonant DC-DC converter are used for improving the dynamic response speed and the disturbance-rejection capacity of the system, can ensure that the system can quickly and accurately control the output voltage under the conditions of output load disturbance, input voltage variation, resonant cavity circuit parameter drift and the like, and are good in accuracy and high in robustness.

2. The high-disturbance-rejection fast-response control system and method for the resonant DC-DC converter can effectively improve the fast dynamic response of the LL C resonant isolated DC-DC converter, can effectively inhibit various disturbances such as load change, resonant element parameter drift, input voltage fluctuation and measurement noise, and is fast in dynamic response.

3. The high-disturbance-rejection fast-response control system and method for the resonant DC-DC converter skillfully apply model information to the design of the hybrid controller, reduce the burden of a linear extended state observer, improve the rapidity and the accuracy of the observer, reduce the delay of disturbance estimation, realize rapid and accurate adjustment on output voltage, and are particularly suitable for the fields of rapid charging and discharging of electric vehicles or power batteries and the like.

4. The resonant DC-DC converter high-disturbance-rejection fast-response control system and method disclosed by the invention have good universality, can be popularized and applied to bidirectional converters and other resonant isolated DC-DC converters, and have wide application prospects.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.

Fig. 1 is a main circuit topology diagram of an LL C resonant isolated DC-DC converter provided in embodiment 1 or embodiment 2 of the present disclosure.

Fig. 2 is a direct-current gain diagram of an LL C resonant isolated DC-DC converter provided in embodiment 1 or embodiment 2 of the present disclosure.

Fig. 3 is a control block diagram of a high disturbance rejection fast response control method for a resonant DC-DC converter provided in embodiment 1 or embodiment 2 of the present disclosure.

Fig. 4 is a design flowchart of a high disturbance rejection fast response control method for a resonant DC-DC converter provided in embodiment 1 of the present disclosure.

Detailed Description

The present disclosure is further described with reference to the following drawings and examples.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 disclosure belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the parts or elements of the present disclosure, and do not refer to any parts or elements of the present disclosure, and are not to be construed as limiting the present disclosure.

In the present disclosure, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present disclosure can be determined on a case-by-case basis by persons skilled in the relevant art or technicians, and are not to be construed as limitations of the present disclosure.

The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.