Sensitivity analysis on influence of zero-pressure-difference point on stability of distributed variable-frequency pump system

Ks can be used to reflect the stability of each branch. It can be determined by calculating the sensitivity of branch flow rate to the speed of branch pump. Compares the stability of the regulation mode with fixed zero-pressure-difference point and that with variable zero-pressure-difference point. Analyses the influence of the position of the zero-pressure-difference point on the stability in the regulation mode with fixed zero-pressure-difference point. The results show that the stability of the regulation mode with fixed zero-pressure-difference point is better than that with variable zero-pressure-difference point, and it is the most advantageous for the whole stability of system to have the zero-pressure-difference point stay in the middle of network.