CN113346767A - 一种双级矩阵变换器的间接滤波器谐振抑制方法 - Google Patents

一种双级矩阵变换器的间接滤波器谐振抑制方法 Download PDF

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CN113346767A
CN113346767A CN202110624842.4A CN202110624842A CN113346767A CN 113346767 A CN113346767 A CN 113346767A CN 202110624842 A CN202110624842 A CN 202110624842A CN 113346767 A CN113346767 A CN 113346767A
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matrix converter
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狄正飞
徐德民
张克涵
崔荣鑫
严卫生
刘明雍
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Northwestern Polytechnical University
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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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters

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  • Power Engineering (AREA)
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Abstract

本发明提出的一种双级矩阵变换器的间接滤波器谐振抑制方法，利用双级矩阵变换器输入侧与输出侧之间没有中间环节并直接相连的电气关系，通过虚拟一条支路，将输入侧的谐波加入到输出侧的参考电流中，再间接反馈到输入侧，实现闭合回路，最终实现滤波器谐振抑制。通过实验验证，对比附图3和图4，本发明提出的方法能够大大改善电源电流is波形，具有算法简单、易于实施、不改变原有双级矩阵变换器系统电路结构和稳定性的优点。

Description

一种双级矩阵变换器的间接滤波器谐振抑制方法
技术领域
本发明属于双级矩阵变换器控制领域，涉及一种双级矩阵变换器的间接滤波器谐振抑制方法。
背景技术
双级矩阵变换器是一种无中间储能环节的全硅型交-交变换器。它由完全可控双向开关矩阵阵列组成,可实现任意相交流输入到任意相交流输出变换。相比于背靠背式双PWM变换器,矩阵变换器的最大优势在于无需储能环节,这一特性可使其功率密度更高,适应温度范围更宽,动态响应更快。因此,矩阵变换器在变频调速、可再生能源发电和电能质量控制等领域具有广阔的应用前景。
在双级矩阵变换器系统电路中，通常会在输入端连接一个输入滤波器来抑制开关切换带来的过电压和电流谐波。然而输入滤波器存在谐振隐患，在某些情况下网侧电源和输入电流的五次和七次谐波可以激发滤波器的串行谐振和并行谐振，严重降低双级矩阵变换器系统的电能质量，破坏系统稳定性。因此，需要对滤波器谐振进行抑制。
现有的滤波器谐振抑制方法大都存在效率低、过于复杂、计算量大等缺点，此外，一般适用的条件也较为苛刻，比如要求输入电流能够独立控制、具备输入电流参考和调制指数受限等，并不适用于双级矩阵变换器系统。因此，发明一种简单、高效、可靠的双级矩阵变换器滤波器谐振抑制方法显得十分重要。
发明内容
要解决的技术问题
为了避免现有技术的不足之处，本发明提出一种双级矩阵变换器的间接滤波器谐振抑制方法。
技术方案
一种双级矩阵变换器的间接滤波器谐振抑制方法，其特征在于步骤如下：
步骤1：在双级矩阵变换器输入侧与输出侧直接相连电路上，每相虚拟一条支路，将输入侧的谐波加载到输出侧；
步骤2：将输入电压Vi输入到锁相环，得到输入电压的相位θi；
步骤3：以输入电压Vi和从锁相环得到的相位θi输入到abc/dq坐标变换模块，进行abc/dq坐标变换，得到dq坐标系下的输入电压Vi dq；
步骤4：将dq坐标系下的输入电压Vi dq输入到数字直流阻断器，得到输入电压谐波成分
Figure BDA0003101792170000021
其中数字直流阻断器的传递函数为：
Figure BDA0003101792170000022
步骤5：将
Figure BDA0003101792170000023
通过虚拟阻尼Rd得到谐波电流
Figure BDA0003101792170000024
步骤6：将谐波电流
Figure BDA0003101792170000025
加到参考输出电流
Figure BDA0003101792170000026
得到更新的参考输出电流
Figure BDA0003101792170000027
步骤7：将更新的参考输出电流
Figure BDA0003101792170000028
进行dq/abc坐标变换，得到新的三相参考输出电流
Figure BDA0003101792170000029
步骤8：将新的三相参考输出电流
Figure BDA00031017921700000210
作为新的参考值输入到双级矩阵变换器预测控制中，实现对滤波器谐振的间接抑制。
有益效果
本发明提出的一种双级矩阵变换器的间接滤波器谐振抑制方法，利用双级矩阵变换器输入侧与输出侧之间没有中间环节并直接相连的电气关系，通过虚拟一条支路，将输入侧的谐波加入到输出侧的参考电流中，再间接反馈到输入侧，实现闭合回路，最终实现滤波器谐振抑制。通过实验验证，对比附图3和图4，本发明提出的方法能够大大改善电源电流is波形，具有算法简单、易于实施、不改变原有双级矩阵变换器系统电路结构和稳定性的优点。
附图说明
图1：本发明双级矩阵变换器的间接滤波器谐振抑制方法流程图
图2：双级矩阵变换器的系统框图
图3：双级矩阵变换器系统电源电流isA、电源电压VsA、输出电流ioa(未采用本发明提出的间接滤波器谐振抑制方法)
图4：双级矩阵变换器系统电源电流isA、电源电压VsA、输出电流ioa(采用了本发明提出的间接滤波器谐振抑制方法)
具体实施方式
现结合实施例、附图对本发明作进一步描述：
参照附图2，双级矩阵变换器系统由电源、滤波器、整流级、逆变级、负载、本发明提出的间接滤波器谐振抑制方法等构成。
参照附图1，本发明提出的间接滤波器谐振抑制方法包含以下步骤：
步骤1：在双级矩阵变换器输入侧与输出侧直接相连电路上，每相虚拟一条支路，将输入侧的谐波加载到输出侧；
步骤2：将输入电压Vi输入到锁相环，得到相位θi；
定义参考输入电压Viref,误差ek，ek1，中间变量yk，yk1，相位Thetak，Thetak_1，角频率wk，wk_1采样时间Ts,dsp程序代码示例如下：
Figure BDA0003101792170000031
Figure BDA0003101792170000041
步骤3：将输入电压Vi和从锁相环得到的相位θi输入abc/dq坐标变换模块，进行abc/dq坐标变换，得到dq坐标系下的输入电压Vi dq；
定义viA，viB，viC为三相输入电压Vi，Vid，Viq为输入电压Vi在dq坐标下分量，Vialfa，Vibeta为输入电压Vi在αβ坐标下分量，dsp程序代码示例如下：
Figure BDA0003101792170000042
步骤4：将dq坐标系下的输入电压
Figure BDA0003101792170000043
输入到数字直流阻断器，得到输入电压谐波成分
Figure BDA0003101792170000044
定义输入电压谐波成分
Figure BDA0003101792170000045
变量为Vdfk1，Vqfk1,中间变量Vdfk，Vqfk，Vdk1，Vqk1，dsp程序代码示例如下：
Figure BDA0003101792170000046
Figure BDA0003101792170000051
步骤5:将
Figure BDA0003101792170000052
通过虚拟阻尼Rd得到谐波电流
Figure BDA0003101792170000053
定义谐波电流
Figure BDA0003101792170000054
变量idk1，iqk1。
idk1＝Vdk1/Rd；
iqk1＝Vqk1/Rd；
步骤6:将谐波电流
Figure BDA0003101792170000055
加到参考输出电流
Figure BDA0003101792170000056
得到更新的参考输出电流
Figure BDA0003101792170000057
定义参考输出电流
Figure BDA0003101792170000058
变量Iodref,Ioqref,更新的参考输出电流
Figure BDA0003101792170000059
变量Iodref1,Ioqref1。
Iodref1＝Iodref+idk1；
Ioqref1＝Ioqref+iqk1；
步骤7:将更新的参考输出电流
Figure BDA00031017921700000510
进行dq/abc坐标变换，得到新的三相参考输出电流
Figure BDA00031017921700000511
定义新的三相参考输出电流
Figure BDA00031017921700000512
为Ioaref,Iobref，Iocref。
Ioaref＝Iodref1*sin(Thetak)；
Ioaref＝Ioaref-Ioqref1*cos(Thetak)；
Iobref＝Iodref1*sin(fref*Thetak-2.09439510239320)；
Iobref＝Iobref-Ioqref1*cos(Thetak-2.09439510239320)；
Iocref＝-Ioaref-Iobref；
步骤8：将新的三相参考输出电流
Figure BDA00031017921700000513
作为新的参考值输入到双级矩阵变换器预测控制中。

Claims (1)

1.一种双级矩阵变换器的间接滤波器谐振抑制方法，其特征在于步骤如下：
步骤1：在双级矩阵变换器输入侧与输出侧直接相连电路上，每相虚拟一条支路，将输入侧的谐波加载到输出侧；
步骤2：将输入电压Vi输入到锁相环，得到输入电压的相位θi；
步骤3：以输入电压Vi和从锁相环得到的相位θi输入到abc/dq坐标变换模块，进行abc/dq坐标变换，得到dq坐标系下的输入电压
Figure FDA0003101792160000011
步骤4：将dq坐标系下的输入电压
Figure FDA0003101792160000012
输入到数字直流阻断器，得到输入电压谐波成分
Figure FDA0003101792160000013
其中数字直流阻断器的传递函数为：
Figure FDA0003101792160000014
步骤5：将
Figure FDA0003101792160000015
通过虚拟阻尼Rd得到谐波电流
Figure FDA0003101792160000016
步骤6：将谐波电流
Figure FDA0003101792160000017
加到参考输出电流
Figure FDA0003101792160000018
得到更新的参考输出电流
Figure FDA0003101792160000019
步骤7：将更新的参考输出电流
Figure FDA00031017921600000110
进行dq/abc坐标变换，得到新的三相参考输出电流
Figure FDA00031017921600000111
步骤8：将新的三相参考输出电流
Figure FDA00031017921600000112
作为新的参考值输入到双级矩阵变换器预测控制中，实现对滤波器谐振的间接抑制。
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