摘要
针对宽负载范围工况脉冲序列(PT)控制三相离网逆变器存在输出电压低频振荡问题,提出一种三相离网逆变器功率基准型脉冲序列(PRM-PT)控制技术。针对不同的输出电压和输出功率,PRM-PT控制在不同功率基准的多个高功率脉冲和低功率脉冲中选择合适的控制脉冲对输出电压进行控制,减小不同输出功率时高、低功率脉冲差异,有效抑制了输出电压低频振荡现象。PRM-PT控制器以离散化方式拟合占空比函数,不需要误差放大器及相应补偿网络,具有环路设计简单、控制运算量低的优点。仿真分析和实验结果表明PRM-PT控制相比PT控制输出电压纹波小、动态响应速度更快,有效抑制了输出电压的低频振荡问题。
For the problem of low-frequency voltage oscillations existing in pulse train(PT)controlled three-phase off-grid inverter operated in wide load range,three-phase off-grid inverter controlled by power reference mode pulse train(PRM-PT)was proposed.For different output voltage and output power,PRM-PT method controls output voltage by selecting appropriate control pulse among several high and low power pulses based on different power references.In this way,the difference of high and low power pulses under different output power was reduced,and low-frequency oscillation was effectively suppressed.Without error amplifiers and compensation networks,PRMPT controller fits duty cycle function in a discrete manner which has the advantages of simple loop design and low control calculation.Finally,simulation analysis and experimental results show that PRM-PT control has smaller ripple and faster dynamic response than PT control,which can effectively suppress the low-frequency voltage oscillation.
作者
王志福
杨平
王一帆
许建平
WANG Zhifu;YANG Ping;WANG Yifan;XU Jianping(Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle,Ministry of Education,SouthwestJiaotong University,Chengdu 610031,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2024年第2期75-86,共12页
Electric Machines and Control
基金
国家自然科学基金(52277201)。
关键词
功率基准
脉冲序列控制
脉冲系数
低频振荡
三相离网逆变器
power reference mode
pulse train control
pulse coefficient
low frequency oscillation
three-phase offgrid inverter
