PLC控制器6ES7414-3XJ00-0AB0

技术HD92四象限高压变频器拓扑优势

国内市场上绝大多数高压变频器均采用功率单元串联多电平结构，其中，功率单元采用两电平拓扑结构，10kV高压变频器每相由8或9个功率单元组成，整机由24或27个功率单元组成，具有功率单元数量众多，体积大的缺点。根据此种情况，汇川公司创新性的提出了三电平功率单元串联多电平结构，使得每个功率单元具有更高的输出电压，10kV高压变频器整机只需要15个功率单元（6kV整机只需要9个功率单元组成），从根本上减少了功率单元数量，减小了变频器整机体积。10kV高压变频器整机拓扑图如图二：

图二：10kV四象限高压变频器拓扑

功率单元采用三电平拓扑结构，中心点采用二极管钳位，整个功率单元由AFE整流、直流滤波、逆变三大部分组成，拓扑结构如图三：

图三：功率单元拓扑结构

当变频器输出转速和输出转矩方向一致时，电机处于电动机状态，此时，功率单元AFE侧从电网获取有更多的功功率，提供给电机转化为机械能；当变频器输出转速与输出转矩方向不一致时，电机处于发电机状态，此时，产生的电能会将功率单元的母线电压抬高，AFE侧迅速将多余的能量回馈到电网。

PLC控制器6ES7414-3XJ00-0AB0

PLC控制器6ES7414-3XJ00-0AB0

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PLC控制器6ES7414-3XJ00-0AB0