基于变频控制的实体模型流量控制

设计了变频流量控制系统，改进了变频器控制方法，采用标准电压输出模块和电压检测模块组合成变频器反馈控制系统，实时调整变频器端子电压调节水泵流量输出。变频器和水泵输出流量成线性关系，通过试验测试了3台泵不同组合条件下频率流量关系，单台泵频率流量线性关系相关系数达到0.99，而多台泵频率流量关系不同于单台泵对应关系，且相关系数有所减小。因此，多泵变频控制系统应采用组合率定法标定不同泵组合时频率流量关系。以甬江模型为例，组合率定法流量控制偏差小于0.5%。

Discharge control of physical model based on frequency converter

Designing converting frequency flow control system, improving the frequency converter control method,combining the standard voltage output mode and the voltage detection module into the inverter feedback control system, and the inverter terminal voltage is adjusted in real-time for adjusting the pump flow output. There is the linear relationships between the inverter and the output flow of the pump. The relationships between the frequency and flow of the three pumps under different combinations are tested. The experiments show that when a pump works, the frequency and flow linearity reach 0.99; however, when several pumps work, the frequency flow relation changes and correlation coefficient is reduced. Therefore, for the multi-pump system, it is necessary to use the combination calibration method to calibrate the frequency flow relationships of different pump combinations, and the experiments by the Yongjiang model have showed the rate of flow control deviation is less than 0.5%.