Sensor-less variable frequency constant-pressure water supply control method

Abstract

The invention discloses a sensorless frequency conversion constant pressure water supply control method. Based on the pump characteristic model established based on the flow and head (pressure) curve, flow and power curve, the feedback of the pressure sensor is simulated through the pump characteristic model to achieve closed-loop frequency conversion without the pressure sensor. Constant pressure water supply control. After the model is established, the expected pressure value can be rewritten arbitrarily without re-measurement. The effect of sensor movement can be reproduced by setting the inverter parameters to complete the constant pressure control of any end load.

Description

technical field [0001] The invention relates to a water supply control method, in particular to a sensorless frequency conversion constant pressure water supply control method. Background technique [0002] The patent CN201410815493.4 jointly applied by Wolong Electric Group Co., Ltd. and Wolong Electric Group Hangzhou Research Institute Co., Ltd. discloses a constant pressure water supply control method without a pressure sensor, which realizes the function of maintaining a constant outlet pressure of the water pump under the condition of no pressure sensor, avoiding It solves many problems caused by the use of pressure sensors, reduces the purchase and maintenance costs of the system, and improves the reliability of the system. However, the water pump constant pressure data calibration step is only for one pressure value. When the expected pressure value changes, it needs to be re-calibrated. And it can only simulate the constant pressure effect of the sensor installed at ...

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Problems solved by technology

[0002] The patent CN201410815493.4 jointly applied by Wolong Electric Group Co., Ltd. and Wolong Electric Group Hangzhou Research Institute Co., Ltd. discloses a pressure sensorless constant pressure water supply control method, which realizes the function of maintaining a constant water pump outlet pressure without a pressure sensor, avoiding It solves many problems caused by the use of pressure sensors, reduces the purchase and maintenance costs of the system, and improves the reliability of the system. However, the water pump constant pressure data calibration step is only for one pressure value. When the expected pressure value changes, it needs to be re-calibrated. And it can only simulate the constant pressure effect of the sensor installed at the near end of the pump, but cannot simulate the constant pressure effect of the sensor installed at the load end, and when there are multiple loads in the system, the method mentioned in the above patent document can only be constant at the near end of the pump. The pressure of the remote end load cannot be constant

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