A Fault Alarm Method for Inverter Cooling Water Pump Based on Dynamic Confidence Rule Base
A technology of cooling water pump and fault alarm, applied in the direction of instrument, program control, test/monitoring control system, etc., can solve problems such as catastrophic consequences of frequency converters
Active Publication Date: 2020-09-25
HANGZHOU DIANZI UNIV
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Problems solved by technology
In the complex working environment of the ship, the water cooling device is extremely important to the frequency converter. Once there is a problem with the water cooling system, it will cause disastrous consequences to the frequency converter
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[0042] A kind of frequency converter cooling water pump failure alarm method based on the dynamic confidence rule base proposed by the present invention, its overall flow chart is as follows figure 1 shown, including the following steps:
[0043] Each of the following steps:
[0044] (1) Let x 1 (t) is the speed variable value of the inverter cooling water pump at time t, and its unit is r / s 2 , x 2 (t) is the variable value of the pump fluid flow rate at time t, and its unit is m / s, and y(t) is the variable value of the pressure difference between the inlet and outlet fluids of the water pump at time t, and its unit is Mpa, which is sampled every 1-3s , a total of T S times, general T S >5000, then sampling time t=1,2,...,T S .
[0045] (2) The pump speed variable x 1 and pump fluid flow rate variable x 2 As the input of the alarm model of the confidence rule base, input the set of reference values n=1,2, where J n is the number of reference values, the pressure...
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The invention discloses a fault alarm method of a inverter cooling water pump based on the dynamic confidence rule base, and belongs to the technical field of equipment state monitoring and fault diagnosis. In the invention using the rotation speed of the cooling unit water pump of the inverter and fluid flow rate as the input of the confidence rule base alarm model, and the pressure difference between the pump inlet and outlet fluids as the output of the model, the alarm model of the confidence rule base is established. It is assumed that the model parameters conform to the normal distribution, given the model parameters at the initial time, the alarm model parameters of the confidence rule base at the current time are dynamically determined according to the model parameters at the previous time, and the predicted values at the current time are obtained. At the same time, the error between the predicted value and the real value at the current time is taken as a new feature to distinguish whether the fault occurs or not, it is determined whether to update the model parameters by comparing the error with the alarm threshold value. At the same time, the present invention takes the error between the predicted value and the real value at the current moment as a new feature to distinguish the occurrence of a fault, and determines whether to update the model parameters by comparing the error with an alarm threshold. The model of the invention has a fast updating speed, can timely give a warning to the failure of the cooling unit water pump of the inverter, and is convenient for engineering implementation.
Description
technical field [0001] The invention relates to a fault alarm method for a cooling water pump of a frequency converter based on a dynamic confidence rule base, and belongs to the technical field of state monitoring and fault diagnosis of industrial equipment. Background technique [0002] With the rapid development of power electronics technology and the advancement of ship propulsion technology, the integrated electric propulsion system is more and more widely used on ships, making electric propulsion ships in terms of maneuverability, reliability, flexibility of layout, propeller matching, operation Efficiency and other aspects have been greatly improved, so that the application range of ship electric propulsion technology continues to expand. As the main propulsion system of ships, the electric propulsion system is becoming the main propulsion system favored by large surface ships in the new century due to its high efficiency, high reliability, high automation and low mai...
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IPC IPC(8): G05B23/02
CPCG05B23/027G05B2219/24065
Inventor 徐晓滨俞卓辰侯平智曾九孙胡燕祝黄大荣韩德强
Owner HANGZHOU DIANZI UNIV