Water Pump Unit Power-Saving Optimization via Switching Points
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Solution Overview
Problem
Current methods for optimizing the operation of parallel water pump units fail to determine the optimal power-saving switching points and operation methods, leading to inefficient energy consumption and lack of concrete energy-saving design indices.
Innovation Solution
A power-saving optimization operation method and switching point determining method that uses working curves and frequency curves to identify optimal switching points for water pump units operating under constant pressure, allowing for efficient adjustment and control of the number of operating water pumps and their speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional single closed-loop control method is used to meet technological requirements, then the water pump units can operate, but the overall operation efficiency is not maximized and power consumption is not minimized
Solution Approach 1:
The patent divides the control system into multiple independent closed-loop control modules, each managing specific parameters (speed, pressure, power consumption) separately. This segmentation allows each module to optimize its specific function while contributing to overall system efficiency, resolving the contradiction between energy loss reduction and control system complexity by making the complexity manageable through modular design.
Solution Approach 2:
The patent dynamically adjusts multiple operating parameters including water pump speed, outlet pressure, and power consumption levels through coordinated closed-loop controls. By continuously changing these parameters based on real-time feedback, the system achieves minimum power consumption while maintaining technological requirements, effectively resolving the energy loss contradiction without requiring overly complex fixed-parameter systems.
2Loss of energy
If speed controller is used to adjust rotating speed of water pumps, then energy-saving operation is achieved, but the optimal switching points and operation methods are not determined leading to inefficient energy consumption
Solution Approach 1:
The patent implements multiple closed-loop feedback control systems that continuously monitor speed, pressure, and power consumption parameters. This feedback mechanism provides precise measurement data that enables accurate determination of optimal switching points, resolving the contradiction between energy-saving operation and precise measurement requirements by making real-time adjustments based on measured parameters.
Solution Approach 2:
The patent employs dynamic adjustment of operating parameters through coordinated closed-loop controls that adapt to changing conditions. The system dynamically determines optimal switching points based on real-time measurements of speed, pressure, and power consumption, rather than relying on fixed predetermined points, thereby achieving both energy efficiency and measurement precision.
3Productivity
If frequency converter is used for speed control, then operating efficiency is improved, but the efficiency change curve under different frequencies and load rates is not provided making it difficult to determine optimal power-saving operation mode
Solution Approach 1:
The patent performs preliminary characterization of the frequency converter's efficiency across different frequencies and load rates before actual operation. By pre-determining the efficiency change curves through laboratory testing or initial system characterization, the system has the necessary information available to make optimal operational decisions, resolving the information loss problem while maintaining high productivity through informed control decisions.
Solution Approach 2:
The patent implements self-service through automated closed-loop control systems that use real-time parameter measurements to determine optimal operating modes without requiring external efficiency curve data during operation. The system serves itself by using measured parameters (speed, pressure, power) to calculate and adjust for optimal efficiency, eliminating the need for pre-stored efficiency change curve information while maintaining high productivity.
Data Source
AI summary
A power-saving optimization operation method and switching point determining method for a water pump unit. In the parallel water pump units, k water pumps converters form a sub-pump unit A. The water output Q1 of a first water pump in the sub-pump unit A, the input power P1 of the frequency converter corresponding to Q1 and the operating frequency f1 of the frequency converter corresponding to Q1 are recorded, where QA=Q1, PA=P1. The QA-PA curve of an operating water pump serves as the working curve w1, where QA=mQ1 and PA=mP1, and k≥m≥2. The working curve wm of m operating water pumps operating at the same frequency is obtained, where f1=f2= . . . =fm. The intersection point of the working curve wm-1 and the working curve wm is the optimal switching point between m-1 operating water pumps and m operating water pumps under the constant pressure Hs.