CN106849302A - 一种电动汽车用三级式无线电能传输系统 - Google Patents

一种电动汽车用三级式无线电能传输系统 Download PDF

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CN106849302A
CN106849302A CN201710150028.7A CN201710150028A CN106849302A CN 106849302 A CN106849302 A CN 106849302A CN 201710150028 A CN201710150028 A CN 201710150028A CN 106849302 A CN106849302 A CN 106849302A
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CN106849302B (zh
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郑昕昕
刘新天
何耀
曾国建
潘轶山
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Anhui Fusion Intelligent Technology Co ltd
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Intelligent Manufacturing Institute of Hefei University Technology
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007Regulation of charging or discharging current or voltage
    • H02J7/00712Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H02J7/00716Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current in response to integrated charge or discharge current
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33561Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/217Conversion of ac power input into dc power output without possibility of reversal 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

本发明公开了一种电动汽车用三级式无线电能传输系统,采用车外AC/DC环节、DCT环节和车内DC/DC环节构成的三级结构,其中AC/DC环节实现PFC和直流母线稳压功能,DCT环节实现车外和车内电子电力变换器的隔离,省去了电气信号的无线通信环节,DC/DC环节实现充放电模式的切换和功率控制,简化了系统结构、提高效率,且能够实现功率和充电模式的可靠控制。

Description

一种电动汽车用三级式无线电能传输系统
技术领域
本发明涉及电动汽车无线电能传输系统领域,具体是一种电动汽车用三级式无线电能传输系统。
背景技术
对于电动汽车中典型的无线电能传输系统,由于输出侧动力电池和输入侧电网无电气连接,需要增加一套无线信号传输设备,通过无线通信向将输出反馈信号传输给主控制器,从而导致系统结构复杂化,且信号易受高频电磁辐射干扰,降低系统工作的可靠性。
发明内容
本发明的目的是提供一种电动汽车用三级式无线电能传输系统,以解决现有技术电动汽车中采用无线信号传输设备存在的问题。
为了达到上述目的,本发明所采用的技术方案为:
一种电动汽车用三级式无线电能传输系统,其特征在于:采用车外AC/DC环节、DCT环节和车内DC/DC环节构成的三级结构,由DCT环节连接车外AC/DC环节和车内DC/DC环节并实现开环控制,其中:
所述AC/DC环节采用三相变流器,该三相变流器由主电路为三相桥式拓扑,三相交流器的交流侧连接三相电网,三相交流器的直流侧通过直流母线连接DCT环节,所述三相变流器由直流稳压环节控制三相变流器的直流侧的电压为恒定值,该直流稳压环节作为三相变流器的电压外环,直流稳压环节的输出作为有功电流基准id *,该有功电流基准id *参与基于坐标变换的直接电流控制,直接电流控制是指通过坐标变换,将交流侧的三相电流转换为两相电流,然后通过直接电流控制使实际电流跟踪电流基准,以实现功率因数校正PFC,并以功率因数校正PFC作为电流内环,由电流内环与电压外环共同实现三相变流器的闭环控制;
所述车内DC/DC环节为电池充放电控制电路,由电池充放电控制电路与车内电池管理系统BMS和整车控制器VMS通信以获知动力电池的状态参数和电网的需求,从而进行恒压或恒流充放电及功率控制,车内DC/DC环节中以恒流充放电环节作为电压外环,恒流充放电环节的输出作为电流内环及恒流充放电环节的电流基准,通过改变电压基准Up *,该电压基准由DSP控制器直接给定,使车内DC/DC环节中电压外环工作在正常或饱和状态,即可实现恒压和恒流模式的切换及功率的控制;
所述DCT环节采用直流变压器,该直流变压器以一个逆变整流桥作为原边与AC/DC环节控制连接,该直流变压器以另一个逆变整流桥作为副边与车内DC/DC环节控制连接,原边的逆变整流桥、副边的逆变整流桥中桥臂功率管分别以0.5满占空比互补导通的开环控制方式,实现车外AC/DC环节和车内DC/DC环节之间实现高频开环控制,并且原边的逆变整流桥、副边的逆变整流桥中分别由桥臂中二极管进行不控整流;DCT环节判断充放电模式的依据为车外的AC/DC环节有功电流基准id *的极性,以动力电池充电时的电流方向为正方向,当id *>0时,说明有功功率由电网向直流母线侧传输,AC/DC环节整流工作,此时原边的逆变整流桥的功率管占空比D=0.5,当id *≤0时,AC/DC环节逆变工作,占空比D=0;同理,副边的逆变整流桥的功率管占空比由车内的DC/DC环节中动力电池充放电电流Ip *,即DC/DC环节中的电流基准的极性决定,占空比D根据充放电时不同的功率流向在0.5和0之间切换。
所述的一种电动汽车用三级式无线电能传输系统,其特征在于:AC/DC环节中,通过直流稳压环节与车内DC/DC环节实现功率的自动匹配。
所述的一种电动汽车用三级式无线电能传输系统,其特征在于:DC/DC环节与DCT环节相连接的直流电压受到AC/DC环节中直流侧的直流母线电压UDC的钳位,能够保持在一定范围内,无需进行稳压控制。
本发明中,DCT环节中原边的逆变整流桥、副边的逆变整流桥分别对应由车外AC/DC环节和车内DC/DC环节的电流基准决定,因此车外和车内无需互通电气信号。
本发明中,电力系统中电网的能量需求不能仅由简单的电气参数进行判断,而是往往通过潮流分析等手段后,经整车控制器VMS与电动汽车沟通,因此动力电池的放电指令由整车控制器VMS发出,而不是由充放电设施直接检测电网的电气参数进行判断,因此无线电力传输系统的车内和车外部分的电气参数始终无需无线通信。
与现有技术相比,本发明的优点在于:
1、能够在没有车内和车外电气信号无线通信的情况下进行充放电控制,简化了系统结构,避免干扰,提高系统工作可靠性。
2、通过AC/DC级的稳压控制的DC/DC级的功率控制,能够实现功率自动匹配,实现了功率和充电模式的可靠控制。
附图说明
图1为本发明系统原理图。
具体实施方式
如图1所示,一种电动汽车用三级式无线电能传输系统,采用车外AC/DC环节、DCT环节和车内DC/DC环节构成的三级结构,由DCT环节连接车外AC/DC环节和车内DC/DC环节并实现开环控制,其中:
AC/DC环节采用三相变流器,其是一个逆变-整流桥式电路,该三相变流器由主电路为三相桥式拓扑,三相交流器的交流侧连接三相电网,三相交流器的直流侧通过直流母线连接DCT环节,所述三相变流器由直流稳压环节控制三相变流器的直流侧的电压为恒定值,直流稳压环节是基于能够实现SVPWM功能的DSP控制系统实现的,该直流稳压环节作为三相变流器的电压外环,直流稳压环节的输出作为有功电流基准id *,该有功电流基准id *参与基于坐标变换的直接电流控制,直接电流控制是指通过坐标变换,将交流侧的三相电流转换为两相电流,然后通过直接电流控制使实际电流跟踪电流基准,以实现功率因数校正PFC,并以功率因数校正PFC作为电流内环,由电流内环与电压外环共同实现三相变流器的闭环控制;
AC/DC环节有功功率P和无功功率Q的计算公式为:
由于电网电压在dq坐标轴上的投影ed和eq为定值,且电流无功分量iq的基准iq *定为0,则AC/DC环节的有功功率由有功电流基准id *决定,id *为电压外环的输出值,而电压外环仅实现高压直流母线的稳压,因此AC/DC环节仅能被动地接受直流母线端输入或吸收的有功功率,不具备主动功率调节功能。
车内DC/DC环节为电池充放电控制电路,由电池充放电控制电路与车内电池管理系统BMS和整车控制器VMS通信以获知动力电池的状态参数和电网的需求,从而进行恒压或恒流充放电及功率控制,车内DC/DC环节中以恒流充放电环节作为电压外环,恒流充放电环节的输出作为电流内环及恒流充放电环节的电流基准,通过改变电压基准Up *,该电压基准由DSP控制器直接给定,使车内DC/DC环节中电压外环工作在正常或饱和状态,即可实现恒压和恒流模式的切换及功率的控制;
DC/DC环节与DCT环节相连接的直流电压受到AC/DC环节中直流侧的直流母线电压UDC的钳位,能够保持在一定范围内,无需进行稳压控制。
DCT环节采用直流变压器,该直流变压器以一个逆变整流桥作为原边与AC/DC环节连接,该直流变压器以另一个逆变整流桥作为副边与车内DC/DC环节连接,原边的逆变整流桥、副边的逆变整流桥中桥臂功率管分别以0.5满占空比互补导通的开环控制方式,实现车外AC/DC环节和车内DC/DC环节之间实现高频开环控制,并且原边的逆变整流桥、副边的逆变整流桥中分别由桥臂中二极管进行不控整流;DCT环节判断充放电模式的依据为车外的AC/DC环节有功电流基准id *的极性,如图1箭头方向所示,以动力电池充电时的电流方向为正方向,当id *>0时,说明有功功率由电网向直流母线侧传输,AC/DC环节整流工作,此时原边的逆变整流桥的功率管占空比D=0.5,当id *≤0时,AC/DC环节逆变工作,占空比D=0;同理,副边的逆变整流桥的功率管占空比由车内的DC/DC环节中动力电池充放电电流Ip *,即DC/DC环节中的电流基准的极性决定,占空比D根据充放电时不同的功率流向在0.5和0之间切换。

Claims (3)

1.一种电动汽车用三级式无线电能传输系统,其特征在于:采用车外AC/DC环节、DCT环节和车内DC/DC环节构成的三级结构,由DCT环节连接车外AC/DC环节和车内DC/DC环节并实现开环控制,其中:
所述AC/DC环节采用三相变流器,该三相变流器由主电路为三相桥式拓扑,三相交流器的交流侧连接三相电网,三相交流器的直流侧通过直流母线连接DCT环节,所述三相变流器由直流稳压环节控制三相变流器的直流侧的电压为恒定值,该直流稳压环节作为三相变流器的电压外环,直流稳压环节的输出作为有功电流基准id *,该有功电流基准id *参与基于坐标变换的直接电流控制,直接电流控制是指通过坐标变换,将交流侧的三相电流转换为两相电流,然后通过直接电流控制使实际电流跟踪电流基准,以实现功率因数校正PFC,并以功率因数校正PFC作为电流内环,由电流内环与电压外环共同实现三相变流器的闭环控制;
所述车内DC/DC环节为电池充放电控制电路,由电池充放电控制电路与车内电池管理系统BMS和整车控制器VMS通信以获知动力电池的状态参数和电网的需求,从而进行恒压或恒流充放电及功率控制,车内DC/DC环节中以恒流充放电环节作为电压外环,恒流充放电环节的输出作为电流内环及恒流充放电环节的电流基准,通过改变电压基准U p *,该电压基准由DSP控制器直接给定,使车内DC/DC环节中电压外环工作在正常或饱和状态,即可实现恒压和恒流模式的切换及功率的控制;
所述DCT环节采用直流变压器,该直流变压器以一个逆变整流桥作为原边与AC/DC环节连接,该直流变压器以另一个逆变整流桥作为副边与车内DC/DC环节连接,原边的逆变整流桥、副边的逆变整流桥中桥臂功率管分别以0.5满占空比互补导通的开环控制方式,实现车外AC/DC环节和车内DC/DC环节之间实现高频开环控制,并且原边的逆变整流桥、副边的逆变整流桥中分别由桥臂中二极管进行不控整流;DCT环节判断充放电模式的依据为车外的AC/DC环节有功电流基准i d *的极性,以动力电池充电时的电流方向为正方向,当i d *>0时,说明有功功率由电网向直流母线侧传输,AC/DC环节整流工作,此时原边的逆变整流桥的功率管占空比D=0.5,当i d *≤0时,AC/DC环节逆变工作,占空比D=0;同理,副边的逆变整流桥的功率管占空比由车内的DC/DC环节中动力电池充放电电流I p *,即DC/DC环节中的电流基准的极性决定,占空比D根据充放电时不同的功率流向在0.5和0之间切换。
2.根据权利要求1所述的一种电动汽车用三级式无线电能传输系统,其特征在于:AC/DC环节中,通过直流稳压环节与车内DC/DC环节实现功率的自动匹配。
3.根据权利要求1所述的一种电动汽车用三级式无线电能传输系统,其特征在于:DC/DC环节与DCT环节相连接的直流电压受到AC/DC环节中直流侧的直流母线电压U DC的钳位,能够保持在一定范围内,无需进行稳压控制。
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