CN107492900B - 一种用于PWM整流器的基于αβ坐标系的PR控制方法 - Google Patents

一种用于PWM整流器的基于αβ坐标系的PR控制方法 Download PDF

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CN107492900B
CN107492900B CN201710804306.6A CN201710804306A CN107492900B CN 107492900 B CN107492900 B CN 107492900B CN 201710804306 A CN201710804306 A CN 201710804306A CN 107492900 B CN107492900 B CN 107492900B
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Abstract

一种用于PWM整流器的基于αβ坐标系的PR控制方法，包括以下步骤：1)构建PWM整流器拓扑结构；2)αβ坐标系的PR控制步骤为：a.软件查正弦表的方式得到电网的相角；b.检测PWM整流器输出电流利用3/2变换将iA、iB、iC变换到αβ坐标系，得到iα、iβ；c.检测母线电压数值，与给定控制目标电压值做差，做PI调节器控制，得到d轴有功分量，变换到αβ坐标系得到idα、idβ有功稳压成份；d.将所得αβ坐标系信息，分别做差，进行α轴的PR谐振器控制和β轴的PR谐振器控制；e.步骤d所得的控制信息，得到三相调制波；形成PWM驱动脉冲驱动IGBT逆变桥动作，整流稳压控制；该方法运算量少，电网不平衡度适应性高，基波控制效果好，电流畸变率小，应用前景好。

Description

一种用于PWM整流器的基于αβ坐标系的PR控制方法
技术领域
本发明属于电力电子控制技术领域，特别涉及一种用于PWM整理器的基于αβ坐标系的PR控制方法。
背景技术
随着电力电子技术的发展，PWM整流器替代不控二极管整流的趋势越来越明显，PWM整流器可以实现网侧电流的正弦化、单位功率因数，几乎对电网没有任何的污染。
PWM整流的拓扑有很多，但是其的控制方式无外乎以下几种：1)三相坐标系的单P控制方法，因为是交流控制使用单p控制器往往比PI控制器要好，缺点明显：开环增益较低，电网的不平衡度、谐波抑制能力较差。2)基于DQ轴的PI控制方法，此控制方法因为将交流分量变化到DQ轴成为直流分量，可以利用PI实现误差控制，但是PI调节器只可以对直流实现无差，对电网中的谐波扰动成份作用很差；对于电网的不平衡问题，因为DQ轴变化需要分正序变换和负序变化，想要很好的抑制不平衡扰动，需要再做负序轴的PI控制，运算量增加不少；同时DQ轴在动态情况下两个轴存在耦合，动态特性较差。
发明内容
为克服上述现有技术的不足，本发明的目的是提供一种用于PWM整理器的基于αβ坐标系的PR控制方法，在解耦的αβ轴进行PR控制(多种谐波次数)，不仅动态解耦，动态响应较快，而且能够在较少运算量的情况下实现对电网不平衡度的抑制，同时灵活的增加需要的次数的谐振器可以对PWM整理器的电流畸变率进行有效的控制改善。
为实现上述目的，本发明采用的技术方案是：一种用于PWM整理器的基于αβ坐标系的PR控制方法，包括以下步骤：
1)构建PWM整流器拓扑结构：三相电压型逆变器与电网通过一相一个电抗器连接，直流母线存在储能电容，通过变流器的开关动作实现稳压和输入电流的正弦化；
2)αβ坐标系的PR控制步骤如下：
a.利用硬件锁相电路取电网过零点，软件查正弦表的方式得到电网的相角；
b.检测PWM整流器输出电流利用3/2变换将iA、iB、iC变换到αβ坐标系，得到iα、iβ；
c.检测母线电压数值，与给定控制目标电压值做差，做PI调节器控制，限幅后得到d轴有功分量，变换到αβ坐标系得到idα、idβ有功稳压成份；
d.将步骤b、步骤c所得αβ坐标系信息，分别做差，进行α轴的PR谐振器控制，同时进行β轴的PR谐振器控制，基波PR谐振器是基础，其他的低次或者高次谐振器根据入网电流畸变率情况决定增减；
e.步骤d所得的控制信息，经过2相坐标系变换到3相坐标系，得到三相调制波；
三相调制波，最终利用SPWM调制方式形成PWM驱动脉冲，来驱动IGBT逆变桥动作，进行整流稳压控制。
本发明具有以下有益效果：
1)基于αβ坐标系的解耦控制，动态响应快(无DQ轴不解耦的问题)；2)采用αβ坐标系的PR控制方法，可以很好的抑制电网不平衡对PWM整流器的影响。3)可以灵活的增加其他需要的谐波次数的PR谐振器对PWM整流器的电流畸变率进行改善。该控制方法相较DQ轴控制方法运算量少，电网不平衡度适应性高，相较三相坐标系基波控制效果好，电流畸变率小，具有非常大的应用前景。
附图说明
图1是本发明所介绍的用于PWM整流器的基于αβ坐标系的PR控制方法的主电路拓扑结构示意图。
图2是本发明所介绍的一种用于PWM整流器的基于αβ坐标系的PR控制方法的控制方法控制框图。
具体实施方式
下面结合具体实施方式和附图对本发明进一步详细说明。
参见图1，图1为PWM整流器拓扑结构。构建PWM整流器拓扑结构：三相电压型逆变器与电网通过一相一个电抗器连接，直流母线存在储能电容，通过变流器的开关动作实现稳压和输入电流的正弦化；
本发明所提的αβ坐标系的PR控制方法实现步骤如下：如图2所示。其具体实现部分如下：
a.利用硬件锁相电路取电网过零点，软件查正弦表的方式得到电网的相角；
b.检测PWM整流器输出电流利用3/2变换将iA、iB、iC变换到αβ坐标系，得到iα、iβ：
Figure BDA0001402325100000031
其中，，
Figure BDA0001402325100000032
c.检测母线电压数值，与给定控制目标电压值做差，做PI调节器控制，限幅后得到d轴有功分量，变换到αβ坐标系得到idα、idβ有功稳压成份；
Figure BDA0001402325100000033
其中，
Figure BDA0001402325100000034
d.将b、c所得αβ坐标系信息，分别做差，进行α轴的PR谐振器控制，同时进行β轴的PR谐振器控制，基波PR谐振器是基础，其他的低次或者高次谐振器根据入网电流畸变率情况决定增减；
PR谐振器的s域传函：
Figure BDA0001402325100000041
对PR谐振器的进行离散化得到：
Figure BDA0001402325100000042
其中：与s域的对应关系
Figure BDA0001402325100000043
Figure BDA0001402325100000044
Figure BDA0001402325100000045
a0＝4kqωqT
a1＝0
a2＝-4kqωqT
利用上面两个式子，得到差分表达式，利用代码实现。
e.步骤d所得控制信息，经过2相坐标系变换到3相坐标系，的到三相调制波。
三相调制波，最终利用SPWM调制方式形成PWM驱动脉冲，来驱动IGBT逆变桥动作，进行整流稳压控制。

Claims (1)

1.一种用于PWM整流器的基于αβ坐标系的PR控制方法，其特征在于，包括以下步骤：
1)构建PWM整流器拓扑结构：三相电压型逆变器与电网通过一相一个电抗器连接，直流母线存在储能电容，通过变流器的开关动作实现稳压和输入电流的正弦化；
2)αβ坐标系的PR控制步骤如下：
a.利用硬件锁相电路取电网过零点，软件查正弦表的方式得到电网的相角；
b.检测PWM整流器输出电流利用3/2变换将iA、iB、iC变换到αβ坐标系，得到iα、iβ；
Figure FDA0002523476330000011
其中，
Figure FDA0002523476330000012
c.检测母线电压数值，与给定控制目标电压值做差，做PI调节器控制，限幅后得到d轴有功分量，变换到αβ坐标系得到idα、idβ有功稳压成份；
Figure FDA0002523476330000013
其中，
Figure FDA0002523476330000014
此为dq坐标系变换到αβ坐标系的变换公式；ωt为步骤a得到的电网的相角；因为为稳压基波成份，因此n＝1；
d.将步骤b、步骤c所得αβ坐标系信息，分别做差，进行α轴的PR谐振器控制，同时进行β轴的PR谐振器控制，基波PR谐振器是基础，其他的低次或者高次谐振器根据入网电流畸变率情况决定增减；
e.步骤d所得的控制信息，经过2相坐标系变换到3相坐标系，得到三相调制波；
三相调制波，最终利用SPWM调制方式形成PWM驱动脉冲，来驱动IGBT逆变桥动作，进行整流稳压控制。
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