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本文分析了螺杆式制冷压缩机在部分负荷下功率因数下降的原因 ,并提出了采用一个前馈 -反馈控制系统 ,在压缩机负荷下降时同步降低供电电压 ,从而提高功率因数的方法。
In this paper, the reasons for the decrease of power factor of screw refrigeration compressors under partial load are analyzed. A feedforward - feedback control system is proposed to reduce the supply voltage synchronously when the compressor load drops, so as to improve the power factor.