Fault Diagnosis Method of Frequency Converter
A fault diagnosis and frequency converter technology, applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve the problems of limited method versatility, poor economy, and dependence on the accuracy of fault detection structures, so as to achieve fault diagnosis and improve versatility. , to avoid the effect of mutual influence
Active Publication Date: 2016-10-05
BEIJING ETECHWIN ELECTRIC
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Problems solved by technology
The first method, although theoretically it can achieve better fault handling and synchronous detection during the working process of the frequency converter, but the cost of the fault diagnosis device and related sensors is basically the same as that of the controller in the frequency converter, so its disadvantage is that it is economical. poor
In the second method, the accuracy of the fault detection structure depends on the experience of the designer, and if the structure of the frequency converter changes, the corresponding signal characteristics and the logic relationship of the fault information will also change. It is necessary to re-establish the classification principle and related database, and the method is universal. restricted
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[0023] Embodiments of the invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
[0024] According to the frequency converter fault diagnosis method conceived in the present invention, by using the inherent controller and sensor of the frequency converter, by making the frequency converter work in the fault diagnosis mode, and starting the components of the frequency converter one by one in the process, according to the actual feedback signal and the standard feedback Signal comparison is used to realize fault diagnosis, thereby avoiding the mutual influence between inverter subsystems, and then not only realizing inverter fault diagnosis, but also better taking into account the requirements of reducing costs and improving versatility.
[0025] The fault di...
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The invention discloses a fault diagnosis method for a frequency converter. The fault diagnosis method includes the steps that whether the frequency converter is in the down state or not is detected, when the frequency converter is detected to be in the down state, a controller starts parts of the frequency converter one by one, whether faults happen to the corresponding parts or not can be judged by detecting the running states of the parts of the frequency converter through inherent sensors of the frequency converter, and fault sources are positioned. According to the fault diagnosis method with the concept, by means of the inherent controller and the inherent sensors of the frequency converter, the frequency converter is made to work in the fault diagnosis mode, the parts of the frequency converter are started one by one in the process, fault diagnosis is achieved according to comparison between a practical feedback signal and a standard feedback signal, and therefore sub-systems of the frequency converter are prevented from influencing one another, fault diagnosis of the frequency converter is achieved, and both the requirement for reducing cost and the requirement for improving universality are well met.
Description
technical field [0001] The invention relates to the field of power electronics, and more specifically, to a fault diagnosis method for a frequency converter. Background technique [0002] The frequency conversion speed control system realizes precise motor speed or torque control through AC-DC-AC power electronic conversion and digital frequency conversion control. Compared with the traditional fixed frequency control method, this control method greatly reduces energy consumption. Therefore, the frequency conversion speed regulation system is widely used in the field of control of various generators and motors. [0003] When faults such as component failure or abnormal cable connection occur in the inverter, the inverter will stop working and report a fault message. Due to the complexity of the structure of the frequency converter, the failure of a single component will often cause abnormal operation of multiple components of the frequency converter, resulting in a large n...
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IPC IPC(8): G01R31/00
Inventor 马乐郭锐武立国
Owner BEIJING ETECHWIN ELECTRIC