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A Pulse Modulation Method for Driving Parallel Water Pump Motors

A water pump motor and pulse modulation technology, which is applied in the control of multiple AC motors, sustainable manufacturing/processing, energy industry, etc., can solve the problems of inability to optimize synchronous efficiency of multi-frequency modulation, large heat loss, and low operating efficiency. Achieve the effect of reducing device cost, reducing heat loss and improving operating efficiency

Active Publication Date: 2018-11-20
NINGBO JIURONG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current direct water supply mode of the pump group is a multi-pump parallel constant pressure water supply system. A programmable controller is used to control the speed of one pump, and the other pumps run at a constant speed; but in most operating conditions ( For example, when the flow rate is small), the overall operating efficiency of the system is very low, resulting in waste; even in the case of individual multi-pump speed regulation operation, due to the use of general-purpose frequency converter technology, it is impossible to perform general-purpose multi-frequency modulation and synchronization to achieve efficient operation. , resulting in the need to install too many buffer capacitors on the DC bus, resulting in large heat loss and high cost

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  • A Pulse Modulation Method for Driving Parallel Water Pump Motors
  • A Pulse Modulation Method for Driving Parallel Water Pump Motors

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0015] see Figure 1 to Figure 2 , A pulse modulation method for driving parallel water pump motors. The control module of the water pump motor speed control system is powered by a DC bus. There are several buffer capacitors on the DC bus. The control module is connected to k water pump motors, k is greater than or equal to 2, and each pump The motor is an AC motor, and the number of phases of the pump motors can be the same, for example, three-phase motors; each pump step can also have different motor phases, such as three-phase motors and two-phase motors; the steps are as follows:

[0016] A) The control module performs phasor control on k pump motors, sets the stator voltage component of each pump motor, and obtains the phasors of k voltage components;

[0017] B) The control module uses the phasor and minimization algorithm to calculate the angle between the...

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Abstract

The invention discloses a pulse modulation method for driving parallel water pump motors. A voltage component corresponding to each water pump motor is calculated by a phasor sum minimization algorithm to obtain included angles between the voltage components; and the phasor sum is minimized, so that a DC pulsating current is greatly reduced; the total capacitance value of buffer capacitors on a DC bus is reduced; the cost is reduced; the heating loss of the buffer capacitors is reduced; the operating efficiency of the whole system is improved; and collaborative speed regulation control can be carried out on a plurality of water pump motors.

Description

Technical field [0001] The invention relates to a pulse modulation method, in particular to a pulse modulation method for driving parallel water pump motors. Background technique [0002] There are three traditional water supply methods: the first is direct water supply by the pump set; the second is water tower and high-level water tank; the third is water supply by pressure tank; and for a long time, people have been committed to the exploration of more superior water supply systems , The frequency conversion speed regulating water pump system is one of this ideal system. [0003] However, the current direct water supply method of the pump set is a multi-pump parallel constant pressure water supply system, which uses a programmable controller to control the speed of one pump, and other pumps run at a constant speed; but under most operating conditions ( For example, when the flow rate is small), the overall operating efficiency of the system is very low, causing waste; even in t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P5/74
CPCH02P5/74Y02P80/10
Inventor 迟颂牟介刚
Owner NINGBO JIURONG ENVIRONMENTAL PROTECTION TECH CO LTD