CN105846703A - 一种三相t型三电平逆变器正弦脉冲宽度调制策略 - Google Patents
一种三相t型三电平逆变器正弦脉冲宽度调制策略 Download PDFInfo
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac 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
- H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac 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
- H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
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Abstract
本发明是一种三相T型三电平逆变器正弦脉冲宽度调制策略,用于控制T型三电平并网逆变器和离网逆变器,其特点是,提供一种T型三电平逆变器实时SPWM算法,不需要FPGA或者CPLD配合,控制逆变器所需要的12路脉冲由DSP运算产生,输出的PWM信号频率大于或等于20kHz,算法全部通过计算或者调用函数实时实现,没有查表过程,计算误差小,控制精度高。原理简单,实现周期短,非常适合仿真及容易DSP编程实现。
Description
技术领域
本发明涉及电力电子逆变器控制领域,具体是涉及一种三相T型三电平逆变器正弦脉冲宽度调制策略,用于控制三相T型三电平并网逆变器和离网逆变器。
背景技术
三相T型三电平变流器脉冲宽度调制(PulseWidthModulation,PWM)策略直接决定变流器输出电压的波形质量、开关损耗和电能转换效率。三电平变流器的PWM策略主要有基于载波的正弦脉冲宽度调制(Sinusoidal PWM,SPWM)策略和基于空间矢量的空间矢量脉冲宽度调制(SpaceVectorPWM,SVPWM)策略。T型三电平变流器SVPWM策略电压利用率高、矢量选择灵活,但该策略算法复杂、计算量大,无法在短时间内完成变流器的控制算法设计。相对于SVPWM策略,基于载波的三电平SPWM策略具有算法简单、易于实现的优点,适用于多种三电平拓扑,且可扩展应用于更多电平的变流器拓扑。
双载波同相型SPWM策略是常用的三电平载波SPWM策略,但其调制波含有负数部分,不能直接赋值给DSP的比较寄存器,因此需要用DSP+FPGA(或CPLD)方案实现,DSP执行控制算法,FPGA生成PWM信号。双载波同相型SPWM策略需要同时完成DSP和FPGA程序设计,开发周期较长,成本较高。
发明内容
本发明的目的是为了克服上述背景技术的不足,提供一种三相T型三电平逆变器正弦脉冲宽度调制策略,此策略不需要FPGA或者CPLD配合,用单DSP方案既能产生驱动三相T型三电平逆变器的12路PWM脉冲,原理简单,实现周期短,非常适合仿真及DSP编程实现。
本发明的目的是由下述技术方案来实现的:一种三相T型三电平逆变器正弦脉冲宽度调制策略,其特征是,它包括以下内容:
设原始调制波的数学表达式为公式(1),
unom=Unom sin(ωt) (1)式中,Unom和ω分别是调制波的幅值和角频率;
调制波ur1的数学表达式与unom相同,如公式(2),
ur1=Unom sin(ωt) (2)
调制波ur2的数学表达式如公式(3),
ur2=Unom sin(ωt)+Utr (3)
式中,Utr为载波的幅值;
调制波ur1大于0的部分与载波uc1比较,生成PWM信号Vg1和Vg4,调制波ur2大于0的部分与载波uc1比较,生成PWM信号Vg2和Vg3,PWM信号与调制波和载波的关系如下:
Vg1和Vg4控制逆变器交流侧电压正半周,Vg2和Vg3控制逆变器交流侧电压负半周;
三相T型三电平逆变器a、b、c三相调制波数学表达式如公式(6),
式中,M为调制度,ura1、urb1、urc1和ura2、urb2、urc2分别为a、b、c三相的原始调制波和重新计算的调制波;
a相调制波ura1、ura2大于0的部分与载波uc1比较,得到4路PWM信号Vga1、Vga4、Vga3、Vga2,PWM信号Vga1、Vga4、Vga3、Vga2驱动a相桥臂的IGBT器件TA1、TA4、TA3、TA2;
b相调制波urb1、urb2大于0的部分与载波uc1比较,得到4路PWM信号Vgb1、Vgb4、Vgb3、Vgb2,PWM信号Vgb1、Vgb4、Vgb3、Vgb2驱动b相桥臂的IGBT器件TB1、TB4、TB3、TB2;
c相调制波urc1、urc2大于0的部分与载波uc1比较,得到4路PWM信号Vgc1、Vgc4、Vgc3、Vgc2,PWM信号Vgc1、Vgc4、Vgc3、Vgc2驱动c相桥臂的IGBT器件TC1、TC4、TC3、TC2。
本发明的一种三相T型三电平逆变器正弦脉冲宽度调制策略不需要FPGA或者CPLD配合,控制逆变器所需要的12路脉冲由DSP运算产生,输出的PWM信号频率大于或等于20kHz,算法全部通过计算或者调用函数实时实现,没有查表过程,计算误差小,控制精度高。原理简单,实现周期短,非常适合仿真及容易DSP编程实现。
附图说明
图1是本发明的一种三相T型三电平逆变器正弦脉冲宽度调制策略原理图;
图2是本发明的一种三相T型三电平逆变器正弦脉冲宽度调制策略控制框图;
图3是依据本发明的控制策略控制逆变器输出相电压UAO的波形示意图;
图4是依据本发明的控制策略控制逆变器输出线电压UAB的波形示意图。
具体实施方式
下面结合附图和实施例对本发明的一种三相T型三电平逆变器正弦脉冲宽度调制策略进行详细说明。
参照图1和图2,本发明的一种三相T型三电平逆变器正弦脉冲宽度调制策略,包括以下内容:
1)设原始调制波的数学表达式为公式(1),
unom=Unom sin(ωt) (1)
式中,Unom和ω分别是调制波的幅值和角频率。
2)调制波ur1的数学表达式与unom相同,如公式(2)。
ur1=Unom sin(ωt) (2)
3)调制波ur2的数学表达式如公式(3)。
ur2=Unom sin(ωt)+Utr (3)式中,Utr为载波的幅值。
4)调制波ur1大于0的部分与载波uc1比较,生成PWM信号Vg1和Vg4。
5)调制波ur2大于0的部分与载波uc1比较,生成PWM信号Vg2和Vg3。
6)PWM信号与调制波和载波的关系如下:
7)Vg1和Vg4控制逆变器交流侧电压正半周。
8)Vg2和Vg3控制逆变器交流侧电压负半周。
9)三相T型三电平逆变器a、b、c三相调制波数学表达式如公式(6)。
式中,M为调制度,ura1、urb1、urc1和ura2、urb2、urc2分别为a、b、c三相的原始调制波和重新计算的调制波。
10)a相调制波ura1、ura2大于0的部分与载波uc1比较,得到4路PWM信号Vga1、Vga4、Vga3、Vga2。
11)PWM信号Vga1、Vga4、Vga3、Vga2驱动a相桥臂的IGBT器件TA1、TA4、TA3、TA2。
12)b相调制波urb1、urb2大于0的部分与载波uc1比较,得到4路PWM信号Vgb1、Vgb4、Vgb3、Vgb2。
13)PWM信号Vgb1、Vgb4、Vgb3、Vgb2驱动b相桥臂的IGBT器件TB1、TB4、TB3、TB2。
14)c相调制波urc1、urc2大于0的部分与载波uc1比较,得到4路PWM信号Vgc1、Vgc4、Vgc3、Vgc2。
15)PWM信号Vgc1、Vgc4、Vgc3、Vgc2驱动c相桥臂的IGBT器件TC1、TC4、TC3、TC2。
本发明的具体实施方式仅为有限的实施例,并非穷举,本领域技术人员不经过创造性劳动的任何复制与改进均属于本发明权利要求所保护的范围。
Claims (1)
1.一种三相T型三电平逆变器正弦脉冲宽度调制策略,其特征是,它包括以下内容:
设原始调制波的数学表达式为公式(1),
unom=Unomsin(ωt) (1)
式中,Unom和ω分别是调制波的幅值和角频率;
调制波ur1的数学表达式与unom相同,如公式(2),
ur1=Unomsin(ωt) (2)
调制波ur2的数学表达式如公式(3),
ur2=Unomsin(ωt)+Utr (3)
式中,Utr为载波的幅值;
调制波ur1大于0的部分与载波uc1比较,生成PWM信号Vg1和Vg4,调制波ur2大于0的部分与载波uc1比较,生成PWM信号Vg2和Vg3,PWM信号与调制波和载波的关系如下:
Vg1和Vg4控制逆变器交流侧电压正半周,Vg2和Vg3控制逆变器交流侧电压负半周;
三相T型三电平逆变器a、b、c三相调制波数学表达式如公式(6),
式中,M为调制度,ura1、urb1、urc1和ura2、urb2、urc2分别为a、b、c三相的原始调制波和重新计算的调制波;
a相调制波ura1、ura2大于0的部分与载波uc1比较,得到4路PWM信号Vga1、Vga4、Vga3、Vga2,PWM信号Vga1、Vga4、Vga3、Vga2驱动a相桥臂的IGBT器件TA1、TA4、TA3、TA2;
b相调制波urb1、urb2大于0的部分与载波uc1比较,得到4路PWM信号Vgb1、Vgb4、Vgb3、Vgb2,PWM信号Vgb1、Vgb4、Vgb3、Vgb2驱动b相桥臂的IGBT器件TB1、TB4、TB3、TB2;
c相调制波urc1、urc2大于0的部分与载波uc1比较,得到4路PWM信号Vgc1、Vgc4、Vgc3、Vgc2,PWM信号Vgc1、Vgc4、Vgc3、Vgc2驱动c相桥臂的IGBT器件TC1、TC4、TC3、TC2。
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