PI Parallel VPI Control for Harmonic Suppression of VSC-HVDC System
吴嘉琪 1罗念华 2朱劲磊 1陈文睿 1吴彬兵3
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作者信息
1. 广东电网有限责任公司广州供电局,广州 510630
2. 南京南瑞继保电气有限公司,南京 211102
3. 南京工程学院电力工程学院,南京 211167
折叠
摘要
针对电压源型换流器高压直流输电 VSC-HVDC(voltage source converter based high-voltage direct current)交流系统中占比较大的5、7、11、13等低次谐波,在比例积分PI(proportional integral)控制的基础上,提出1种dq坐标系下基于矢量比例积分VPI(vector proportional integral)调节器的选择性谐波电流控制策略.其中,PI用于控制电流误差直流分量,而VPI用于抑制电流误差的倍频波动.与比例积分谐振PIR(proportional integral resonance)调节器不同,VPI含有二阶分子,可在所设谐振频率点处实现控制系统闭环传递函数的理想0°相位延迟,因此其对谐波电流的控制精度优于PIR.利用Simulink软件建立1个2端VSC-HVDC系统,分别对传统PI、PIR及PI并联VPI这3种控制方式下VSC的2侧交流电流进行仿真,通过对比谐波含量,验证VPI谐波抑制性能的优越性.
Abstract
Aimed at the 5th,7th,11th,13th and other low-order harmonics which account for a large proportion in a voltage source converter based high-voltage direct current(VSC-HVDC)AC system,on the basis of proportional integral(PI)control,a selective harmonic current control strategy based on a vector proportional integral(VPI)regulator in dq coordinate system is proposed,in which PI is used to control the DC component of current error while VPI is used to suppress the frequency doubling fluctuation of current error.Different from the proportional integral resonance(PIR)regulator,VPI contains a second-order numerator,which can achieve an ideal 0° phase delay of the closed-loop transfer function of the control system at the resonance frequency point.As a result,its control accuracy of harmonic current is better than that of PIR.A two-terminal VSC-HVDC system is established by using the Simulink software,and the AC current on two sides of VSC in three control modes of traditional PI,PIR and PI parallel VPI is simulated.Through a comparison of harmonic content,the superior harmonic suppression performance of VPI is verified.
关键词
高压直流输电/电压源型换流器/谐波/矢量比例积分控制器
Key words
High-voltage direct current(HVDC)transmission/voltage source converter(VSC)/harmonic/vector proportional integral(VPI)controller
维普
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