Using VFD to save energy is great concept. However, what are the impaction interim of ability to develop a robust and efficient control strategy that involves manipulation the pump speed to control flow rate and discharge pressure. Id the typical PID control algorithm effective here or VFD need different control algorithm. I appreciate sharing your experience.

These feature are in Build in some VFDs no seperate Algorith is required. Directly Flow & Pressure feedback can be provided to VFD it uses its internal PID and provide the flow as per process requirement.