目前，变频驱动器（VFD）一直应用于可变流量系统中的电机，以调节泵水流量。同时，如果单个泵不能满足所需的水流量，则需要多个并联泵。因此，在具有并联泵的可变流量系统中，可以通过在较高转速下运行较少的泵或在较低转速下运行较多的泵来满足水流和水头需求。并联泵的顺序应基于VFD电机泵系统的水-线效率，该系统结合了泵、电机和VFD在任何水流量和水头下的效率。然而，在可变频率下，目前还没有很好地模拟电机效率。本文的目的是开发一种具有精确水-线效率模型的最佳泵顺序控制。首先，变频电机的线到水效率- 采用电机等效电路法对泵系统进行改进，计算变频时的电机效率，然后应用改进的线对水效率，为三台并联泵的二次冷冻水系统确定最佳运行区域。仿真结果表明，与最大流量顺序控制相比，所开发的最佳泵顺序控制可将系统功率输入降低25%，与最佳泵效率控制相比可降低3%。引文:2017年冬季会议，内华达州拉斯维加斯，《交易》，第123卷，第一部分

Currently, variable-frequency drives (VFDs) are alwaysapplied on the motors in variable flow systems to modulate thepump water flow. Meanwhile, multiple parallel pumps arerequired if a single pump cannot satisfy the required water flowrate. Therefore, the water flow and head demand in variableflowsystems with parallel pumps may be satisfied by eitherfewer operating pumps at a higher speed or more operatingpumps at a lower speed. Parallel pumps should be sequencedbased on the water-to-wire efficiency of a VFD-motor-pumpsystem, which combines the efficiencies of the pump, motor,and VFD at any water flow rate and head. However, the motorefficiency is currently not well modeled under variablefrequency. The purpose of this paper is to develop an optimalpump sequencing control with an accurate water-to-wire efficiencymodel. First, the wire-to-water efficiency of a VFDmotor-pump system is improved by applying a motor equivalentcircuit method to calculate the motor efficiency at variablefrequency, and then the improved wire-to-water efficiency isapplied to develop the optimal operating regions for a secondarychilled-water system with three parallel pumps. The simulationresults show that the developed optimal pumpsequencing control can reduce the system power input by upto 25% over the maximum flow sequencing control and by upto 3% over the best pump efficiency control.