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A method for designing a frequency converter alarm of a marine electric propulsion system

A technology of electric propulsion and design method, applied in the direction of instruments, calculations, computer components, etc., can solve the problems of inability to achieve real-time monitoring and accurate alarm, high false alarm rate and false negative rate, etc.

Active Publication Date: 2019-01-04
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, considering the complex working conditions on the ship, these traditional methods cannot well eliminate various uncertainties in the operation of the frequency converter and the interference of sensor information collection, resulting in excessive false alarm rates and false alarm rates, and cannot achieve real-time monitoring. With the purpose of precise alarm

Method used

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  • A method for designing a frequency converter alarm of a marine electric propulsion system
  • A method for designing a frequency converter alarm of a marine electric propulsion system
  • A method for designing a frequency converter alarm of a marine electric propulsion system

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Embodiment Construction

[0051] The present invention proposes a method for designing a frequency converter alarm for a ship electric propulsion system, the flow chart of which is as follows figure 1 shown, including the following steps:

[0052] (1) For the 380V power station in the ship's electric propulsion system, according to the "Code for the Classification of Sea-going Steel Ships", the normal working range of the effective value x of the input voltage of the inverter phase A of the power station is 304V ~ 456V, and x is lower than 304V It is an abnormally low operating state, and it is an abnormally high operating state when it is higher than 456V. The sampling frequency for x is 10.24KHz. Let x(k), k=1,2,3,...,K is the sensor’s monitoring voltage x In the online measurement sequence, k is the sampling time, and the number of samples K must be greater than 20,000.

[0053] (2) Set the identification frame of the inverter alarm as Θ={NA,LA,HA}, where NA=0 means that the inverter is in normal o...

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Abstract

The invention relates to a design method of a frequency converter alarm of a ship electric propulsion system, belonging to the field of ship safe operation and maintenance. At first, the historical data of the effective value of the A-phase input voltage of the frequency convert is converted into an alarm reliability vector by using a relational mapping transformation method, and the alarm reliability vector is then recursively fused at the current time with the alarm reliability vector at the past time by using the alarm reliability fusion rule, the fusion process can effectively reduce the influence of uncertainty and reduce the false alarm rate and missed alarm rate of the alarm device. The global alarm reliability vector at the current time is obtained and the global alarm reliabilityvector is used to determine whether the alarm is issued.

Description

technical field [0001] The invention relates to a design method for a frequency converter alarm of a ship electric propulsion system, belonging to the field of safe operation and maintenance of ships. Background technique [0002] In the process of research and application of ship electric propulsion technology, the advantages of electric propulsion technology, such as high efficiency, maneuverability, light weight, small size, and flexible layout, are favored by more and more ships. According to statistics, since the 1980s, about 1 / 3 of newly built passenger ships, icebreakers, ferries, etc. have adopted electric propulsion systems, and in recent years, more and more other types of newly built ships have adopted electric propulsion systems. On the one hand, electric propulsion technology is gradually becoming a trend of ship propulsion. On the other hand, there are still many operational safety and fault alarm problems that need to be solved in modern ship electric propulsi...

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Application Information

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IPC IPC(8): G06K9/62
CPCG06F18/22G06F18/214
Inventor 徐晓滨翁旭高海波盛晨兴高迪驹李建宁
Owner HANGZHOU DIANZI UNIV
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