摘要
Vienna整流器在运行中存在模型参数变化和外部扰动等不确定性以及过零点电流畸变问题。为此,提出了一种带过零畸变补偿的改进滑模反推直接功率控制方法。首先,基于考虑不确定性的输出电压–有功功率模型和无功功率模型,采用了带指令滤波器的反推设计方法,并在反推的最后一步使用了滑模控制律;然后,从端电压矢量滞后的角度分析了Vienna整流器固有的电流过零畸变现象,并提出了一种过零畸变补偿机制;最后,通过Matlab/Simulink仿真和半实物实验对所提方法的有效性进行了验证。结果表明:所提方法能使控制系统有效跟踪参考值;与传统比例积分控制相比,其具有更好的动态性能和鲁棒性;与没有过零畸变补偿的情况相比,过零畸变补偿机制下电流畸变得到了有效抑制,电流总谐波畸变率降低了约1%。
During operation,the Vienna rectifier faces zero-crossing current distortion and uncertainties such as changes of model parameters,external disturbances and so on.Therefore,we proposed an improved sliding-mode backstepping direct power control method with zero-crossing distortion compensation.Firstly,based on the models of output voltage and active power and reactive power considering uncertainties,we adopted the backstepping design method with command filter and employed the sliding-mode control law in the last step of backstepping.Secondly,we analyzed the inherent problem of zero-crossing current distortion of the Vienna rectifier from the perspective of terminal voltage vector lagging,and proposed a compensation mechanism for zero-crossing distortion.Finally,the effectiveness of the proposed method was verified by Matlab/Simulink simulations and hardware-in-the-loop experiments.The results show that the proposed method can enable the control system to effectively track the reference value and has better dynamic performance and robustness than the traditional proportional-integral control.Moreover,compared with the case without zero-crossing distortion compensation,the current distortion is effectively suppressed under the zero-crossing distortion compensation mechanism,and the total harmonic distortion rate of the current is reduced by about 1%.
作者
陈才学
欧阳港
王昭鸿
朱江
彭暄惠
熊志刚
CHEN Caixue;OUYANG Gang;WANG Zhaohong;ZHU Jiang;PENG Xuanhui;XIONG Zhigang(School of Automation and Electronic Information,Xiangtan University,Xiangtan 411105,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第10期3996-4005,共10页
High Voltage Engineering
关键词
VIENNA整流器
直接功率控制
反推法
指令滤波
滑模控制
过零畸变补偿
Vienna rectifier
direct power control
backstepping
command filter
sliding-mode control
compensation of zero-crossing distortion
