摘要
为了降低静止无功发生器SVG的导通损耗,在SVG中引入TNPC型三电平主电路,构建了TNPC型三电平SVG的总体方案。在分析TNPC型三电平主电路工作状态和死区效应的基础上,提出了无死区效应的三载波层叠PWM控制策略。该方法采用上、下两层载波,每层载波均包含原载波、相位超前和相位滞后载波,超前与滞后的相位与死区时间有关。推导了在不同工作状态各功率开关器件的驱动信号和调制波与三载波比较所得信号的逻辑关系。建立了TNPC型三电平SVG仿真模型,搭建了相应实验平台,仿真与实验结果表明该方法在补偿后电网电流电压同相位,功率因数提高,证明了该方法的有效性和正确性。表明引入无死区效应的TNPC型三电平SVG具有更好的无功补偿能力,同时避免了死区效应带给SVG的不利影响。
In order to reduce the turn-on loss of SVG,the TNPC-type three-level main circuit is introduced into the SVG,and the overall scheme of the TNPC-type three-level SVG is constructed. On the basis of analyzing the working state and dead zone effect of TNPC-type three-level main circuit,a three carrier disposition PWM control strategy without dead zone effect is proposed. The proposed method uses the upper and lower carrier waves,each carrier contains primary carrier,phase lead and phase lag carrier,and the phase of lead and lag is related to deadtime. In this paper,the logic relations between the driving signal of each power switch device and the signal acquired by the modulation wave compared with the three carriers in different working conditions are inferred. The TNPC-type three-level SVG simulation model is established,and the corresponding experimental platform is built.The simulation and experimental results show that the proposed method can make the current and voltage of the grid same phase and the power factor is increased after compensation,and the validity and correctness of the method are proved. It is shown that the TNPC-type three-level SVG with no dead zone effect has better reactive power compensation capability and avoids the adverse effect of dead zone effect on SVG.
出处
《哈尔滨理工大学学报》
CAS
北大核心
2017年第5期46-51,共6页
Journal of Harbin University of Science and Technology
基金
黑龙江省自然科学基金(E201444)
关键词
静止无功发生器
三电平
三波层叠PWM
无死区效应
Static Var Generator
three-level
three carrier disposition PWM
no dead zone effect
