摘要
针对双PWM变频调速系统谐波污染严重、动态响应慢等问题,提出了一种基于虚拟磁链的双PWM变频系统预测直接功率控制策略.首先,分析了双PWM变频系统,建立两相静止坐标系数学模型.其次,整流侧采用基于虚拟磁链的模型预测直接功率控制策略,整流侧采用虚拟磁链定向,降低电网电压谐波干扰,增加系统的可靠性.另外,采用两步预测进行延时补偿,且采用重复控制对系统稳态有功和无功功率误差进行修正,并利用空间矢量脉宽调制技术选择整流侧期望开关状态.再次,逆变侧采用转子磁链定向矢量控制策略.最后,以异步电机为负载建立仿真模型.仿真结果表明:该双PWM变频调速方案能够进一步抑制直流电压波动、加快系统动态响应速度、减小交流侧输入电流谐波含量.
There are some deficiencies that the serious harmonic pollution and slow dynamic response of dual PWM(pulse width modulation)frequency-variable speed regulation system.This paper introduces a dualPWM frequency-variable speed regulation system model predictive direct power control strategy based on virtual flux.First of all,the dual-PWM frequency-variable system is analyzed and a mathematical model of two-phase stationary axis system is established.Secondly,in the rectifier side model predictive direct power control strategy based on virtual flux is adopted,rectifier side with virtual flux oriented,reduce the grid voltage harmonic interference and increase the reliability of the system.In addition,two-step prediction is developed to compensate for the delay of the control system;and the repetitive control is used to correct the steady-state active and reactive power errors of the system.Meanwhile,thestateofswitchesforrectifieris determined with the help of space vector pulse width modulation technology.Thirdly,the control strategy for inverter adopted rotor flux orientation control.Finally,the induction motor is used as the load to build a simulation model.The simulation results show that the proposed control strategy has improved the dynamic response of the system,also effectively inhibited the DC bus voltage fluctuation,and reduced total harmonic distortion of the AC side current.
作者
王辉
李宇豪
张文博
李静怡
赵冬阳
Wang Hui;Li Yuhao;Zhang Wenbo;Li Jingyi;Zhao Dongyang(College of Electrical Engineering & Renewable Energy,China Three Gorges Univ.,Yichang 443002,China;Hubei Provincial Engineering Technology Research Center for Microgrid,China Three GorgesUniv.,Yichang 443002,China)
出处
《三峡大学学报（自然科学版）》
CAS
北大核心
2019年第3期69-74,共6页
Journal of China Three Gorges University：Natural Sciences
基金
湖北省微电网工程技术研究中心开放基金(2015KDW05)
关键词
双PWM变频系统
虚拟磁链
模型预测直接功率控制
重复控制
转子磁链定向矢量控制
Dual PWM frequency conversion system
virtual flux
model predictive direct power control
repetitive control
rotor flux orientation control
