CN115065175B - 基于高斯自适应的pwm滑模控制方法 - Google Patents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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Abstract
Description
技术领域
本发明涉及无线电力传输技术领域,具体是基于高斯自适应的PWM滑模控制方法。
背景技术
无线电力传输***作为一种新型的能量传输方式,具有灵活性,安全性高和可移动性等优点,已经被广泛应用于水下应用、可植入式医疗设备和物联网设备等领域。无线电力传输***常使用DC-DC电路+控制器的方案实现输出端的电压管理。控制方式主要有PID控制、基于滞环调制的滑模控制等。PID控制是一种线性控制器,不依赖于***模型,仅仅根据期望与现状的偏差调节,调节参数也只有三个,设计、调节参数简单。
但是,对于非线性的无线电力传输***来说,PID控制用线性近似非线性,精度会有所下降。滑模控制是一种非线性控制策略,且对于扰动不敏感,具有较好的鲁棒性。理论上,***的工作频率越高,滑模控制能取得越好的工作状态,但对于Buck电路来说,开关频率过高会产生较大的开关损耗,电磁干扰也不可忽视。基于滞环调制的滑模控制引入滞环带限制开关频率,但输入电压或负载发生变化时,开关频率会发生变化,这就对器件选型造成了一定困难。
鉴于此,有必要对控制器进行改进,从而优化无线电力传输***的性能。
发明内容
本发明的目的在于提供基于高斯自适应的PWM滑模控制方法,以解决上述背景技术中提出的问题。
本发明的技术方案是:基于高斯自适应的PWM滑模控制方法,包括以下步骤:
优选的,所述S1中使用的高斯函数如公式所示:
优选的,所述S2中,滑模存在条件及控制信号与斜坡信号的关系如下:
优选的,所述无线电力传输***包括耦合***、整流电路和Buck电路,且耦合***通过整流电路与Buck电路相连接,所述耦合***实现能量的无接触传输,所述整流电路将AC信号转换为DC信号,所述Buck电路管理输出电压。
本发明通过改进在此提供基于高斯自适应的PWM滑模控制方法,与现有技术相比,具有如下改进及优点:
其一:本发明使用定频滑模控制方案,可以避免开关频率不确定的情况,有利于电子器件的选型,减小开关损耗;使用PWM方式实现定频滑模控制,不需要附加硬件电路,减少硬件成本。
其二:本发明使用基于高斯自适应的PWM滑模控制方法,控制器参数在***运行期间可以动态调整,无线电力传输***获得了更短的电压跟踪时间,更小的稳态误差和纹波电压。
附图说明
下面结合附图和实施例对本发明作进一步解释:
图1是本发明中基于高斯自适应的PWM滑模控制方法流程框图;
图2是本发明中无线电力传输***的等效电路图。
具体实施方式
下面对本发明进行详细说明,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
本发明通过改进在此提供基于高斯自适应的PWM滑模控制方法,本发明的技术方案是:
基于高斯自适应的PWM滑模控制方法,包括以下步骤:
其中,是高斯函数的输入,是趋于无穷时的边界限制,是为0时的边界限制,与共同决定了高斯函数的开口方向,c决定曲线的凹凸程度(高斯函数是一个光滑函数,其导数也是光滑的,函数存在上下界,曲线凹凸程度可调。曲线光滑的特性使得控制器参数不会出现突变,无线电力传输***的输出电压曲线比较平滑,存在上下界,控制器参数就会受到限制,凹凸程度可以改变控制器参数的变化速度),b是曲线尖峰中心的坐标;
滑模存在条件及控制信号与斜坡信号的关系如下:
如图2所示,所述无线电力传输***包括耦合***、整流电路和Buck电路,且耦合***通过整流电路与Buck电路相连接,所述耦合***实现能量的无接触传输,所述整流电路将AC信号转换为DC信号,所述Buck电路管理输出电压。
具体的,所述耦合***包括一个交流电压源,其频率为2MHz,为电源内阻,一个传输电感,两个谐振电感,一个接收电感,四个谐振电容,三个寄生电阻;其中,所述整流电路包括一个全桥整流器和一个滤波电容;其中,所述Buck电路包括一个电感,一个电容,一个续流二极管,一个输出电阻。
该控制方法通过高斯函数对传统的PWM滑模控制器施加特定的自适应规则,在这种情况下,控制器参数根据高斯函数动态调整,在无线电力传输***中,DC-DC电路作为输出电压管理阶段,其输入电压是随时间变化的,这就规定了静态的控制器参数并不能使***达到最佳性能,在设计自适应控制方案时要注意控制器参数的动态变化必须满足滑模存在条件,使用基于预测比较的方法,首先预测未来n个控制信号的值,然后将控制信号与斜坡信号进行比较决定是否更新控制器参数。该控制方案使无线电力传输***获得了较短的跟踪时间,较小的稳态误差和纹波电压。
上述说明,使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下,在其它实施例中实现。因此,本发明将不会被限制于本文所示的这些实施例,而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。
Claims (7)
1.基于高斯自适应的PWM滑模控制方法,其特征在于:包括以下步骤:
所述S2中,滑模存在条件及控制信号与斜坡信号的关系如下:
所述无线电力传输***包括耦合***、整流电路和Buck电路,且耦合***通过整流电路与Buck电路相连接,所述耦合***实现能量的无接触传输,所述整流电路将AC信号转换为DC信号,所述Buck电路管理输出电压。
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