一种双PWM变换器新改进型直接功率控制策略  

Research on improved direct power control for dual PWM converter

作　　者：邱爱中[1] 张海泉[1] 崔晓[1] 邱大为[2] 

机构地区：[1]郑州师范学院,郑州450044 [2]中国科学技术大学,合肥230000

出　　处：《国外电子测量技术》2016年第4期59-63,共5页Foreign Electronic Measurement Technology

基　　金：河南省科技攻关重点项目(142102210008);河南省科技厅开放合作项目(142106000065);郑州市科技发展计划项目(20150536,20150542);国家留学基金委资助项目(201408410203)资助

摘　　要：为了解决双PWM变换器常规直接功率控制的电压外环响应速度慢的问题,提高控制系统跟踪性能,首先,设计了一种新型开关矢量表,在某些扇区由原来的一个矢量控制变为两个矢量控制,从而改善有功功率和无功功率的变化程度在不同扇区影响的差异性,增强灵敏程度和实时性;其次,提出电机侧功率向前反馈的控制策略,增设反馈网络,提高响应速度,确保功率给定,改变了常规电压外环缓慢的调整过程。并在功率波形、突加负载的响应速度、电网电流、谐波等方面,与常规直接功率控制进行了实验对比。实验结果表明,本文设计的控制系统能在负载变化时实现快速跟踪响应并恢复和保持稳态,验证了该策略的有效性。The tracking performance of direct power control for dual PWM converter is poor,and the response speed of voltage out loop.The causes of existing conventional direct power control of the problem is analyzed in this paper.According to the influence of the change of active power and reactive power,a switching vector table model in which there are two voltage vectors in some sectors is used.In order to improve the response,the power strategy of feedforward control is put forward based on the power balance relationship.The power of motor side is feedforward on the network side to ensure the given power adding feedforward channel.In the waveform of the power,sudden load response speed,grid current,harmonics,the contrast experiment was done between this control and direct power.The experimental results show that,this improved direct power control strategy for the dual PWM converter can respond quickly to load changes and restore homeostasis,which is robust to load and system parameters perturbation,those verify the effectiveness of the proposed method.

关 键 词：双PWM变换器 空间矢量脉宽调制 直接功率控制 开关表 功率前馈 

分 类 号：TM461[电气工程—电器] TN98[电子电信—信息与通信工程]