摘要
为解决工业现场多电机运行及再生能量利用问题,提出一种可同时驱动双电机异步运行的三端口级联多电平变换器拓扑及控制系统。将传统H桥级联多电平变换器与六边形变换器拓扑结合构成一个三端口AC/AC/AC结构。其中,H桥级联变换器每单元前端通过移相变压器接入电网,作为输入端口;六边形拓扑相邻顶点则构成两交流输出端口。采用恒压频比控制,结合功率分配分析,分别给定两输出端口控制信号,驱动双电机异步运行。六桥臂可等效为两组耦合三相对称电源,将一台电机再生能量转移供给另一台电机的电动运行,以此提出新的能量流动路径,降低单元直流侧电容电压泵升。以12单元6桥臂的三端口级联多电平变换器为例,通过Matlab仿真及实验结果验证了该拓扑及控制策略的可行性和有效性。
In order to drive multi-motor in industrial field and recycle their regenerative energy,a tri-port cascaded multilevel converter for two-motor asynchronous drive was proposed.The H-bridge cascade multilevel converter and the hexagonal topology were combined to form a tri-port AC/AC/AC system,in which the front end in each cell of H-bridge converter was connected to the main grid by a phase shifting transformer as the in-port,and the two out-port were connected to the endpoints of the hexagonal converter.Considering the analysis of power distribution,two different control instructions based on V/f control were sent to drive two asynchronous-operation motors.The six branches of converter equaled to two sets of coupling three-phase symmetric power,through which the regenerative energy from the generated motor can be supplied to another one in motoring mode directly.So a new method of energy conservation was proposed,and the voltage increase of the cell's DC-link capacitor was suppressed.A tri-port cascaded multilevel converter with twelve cells,six branches was taken as an example.The simulation in Matlab/Simulink and experimental platform were built.The results demonstrate the effectiveness of the proposed topology and control strategy.
作者
王盼
刘飞
查晓明
宫金武
冯锟
熊晓琪
WANG Pan;LIU Fei;ZHA Xiaoming;GONG Jinwu;FENG Kun;XIONG Xiaoqi(School Of Electrical Engineering, Wuhan University, Wuhan 430072, Hubei Province, Chin)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第6期1799-1809,共11页
Proceedings of the CSEE
基金
国家自然科学基金项目(51577137,51637007)~~
关键词
三端口级联多电平
六边形
双电机异步运行
功率分配
再生能量利用
tri-port cascaded multilevel
hexagon
two- motor asynchronous drive
power distribution
regenerative energy recycling