分析了变频驱动并联水泵变压变流量运行优化调度问题的常用建模方法，并比较了各种方法的优劣。 常用的方法是以水泵轴功率作为目标函数，以供水指标和高效区为约束条件。另一种方法是以满足扬程指标时 的实际流量与所需流量之差的二次方作为目标函数，以水泵的高效区作为约束条件。提出了一种新的建模方法， 模型物理意义与实际工况严格相符，具有较高的精度，满足了工程中对水泵切换频率尽量小的要求。仿真结果 表明该方法是有效的。

The paper analyzes common methods for the optimal scheduling modeling problem of variable-pressure variable-flow operation of inverter-drive pumps connected in parallel and compares the merits and defects of them. In the common method, the objective function is the shaft horsepower of the pumps and the constrained conditions are water supply target and high-efficiency area of pumps. In another method, the objective function is the square of the difference between the actual and needed flow when satisfying the lift target and the constrained conditions are high-efficiency areas of pumps. The paper proposes a new modeling method, which is compatible with the actual operation and has higher precision and satisfies the engineering requirement on lower switching frequency. Simulation results have proved its validity.