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    • 6. 发明申请
    • RIDE-THROUGH METHOD AND SYSTEM FOR HVAC&R CHILLERS
    • 用于HVAC&R冷却器的方法和系统
    • WO2007143217A3
    • 2008-08-21
    • PCT/US2007013417
    • 2007-06-07
    • JOHNSON CONTROLS TECH COSCHNETZKA HAROLD RJADRIC IVAN
    • SCHNETZKA HAROLD RJADRIC IVAN
    • H02M5/458
    • H02J9/062H02M5/458
    • A method of providing ride-through capability in a chiller/refrigeration system employs a variable speed drive with an active converter stage, a DC link stage and an inverter stage for providing variable frequency and voltage to power at least one motor. An induction motor is coupled to the output of the inverter stage for driving a compressor in the chiller/refrigeration system. The ride-through method comprises operating the active converter to regulate the DC link voltage of the DC link stage to a predetermined voltage level until the current through the active converter equals a predetermined current limit, then transferring regulation of the DC link to the inverter upon reaching the current limit of the converter. The compressor is unloaded, and the power flow through the inverter is reversed to maintain the voltage level of the DC link stage. Pre-rotation vanes, slide valve, or check valve are used to unload the compressor.
    • 在冷冻机/制冷系统中提供穿越能力的方法采用具有有源转换器级,DC链路级和逆变器级的变速驱动器,用于提供可变频率和电压以对至少一个电动机供电。 感应电动机与变频器级的输出端连接,用于驱动冷冻机/制冷系统中的压缩机。 该直通方法包括操作有源转换器以将DC链路级的DC链路电压调节到预定的电压电平,直到通过有源转换器的电流等于预定的电流限制,然后将DC链路的调节转移到逆变器上 达到转换器的电流极限。 压缩机卸载,逆变器的功率流反转,以保持直流母线的电压电平。 预旋转叶片,滑阀或止回阀用于卸载压缩机。