Traction transmission system direct-current side supporting capacitor state monitoring circuit and method
A technology that supports capacitance and traction drive. It is used in capacitance measurement, resistance/reactance/impedance measurement, and electrical measurement. It can solve problems such as difficulty in adding DC side capacitance current sensors.
Active Publication Date: 2019-11-19
重庆中涪科瑞工业技术研究院有限公司
View PDF7 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] Aiming at the defects in the prior art, the DC side supporting capacitor state monitoring circuit and method of the traction transmission system provided by the present invention solve the problem that it is difficult to add a DC side capacitor current sensor, and can monitor the two performance parameters of capacitor degradation in real time: resistance ESR and capacitance C
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0038]Embodiments of the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and therefore are only examples, rather than limiting the protection scope of the present invention.
[0039] refer to Figure 2-3 As shown, the DC side support capacitor state monitoring circuit of the traction drive system includes a power module, an impedance module, a rectifier module, an RC harmonic module and an inverter;
[0040] The common terminal of the power module is grounded, the output terminal of the power module is connected to the input terminal of the impedance module, the output terminal of the impedance module is connected to the rectifier module, and the output terminal of the rectifier module is respectively connected to the input terminal of the RC harmonic module and the input terminal of the ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention belongs to the technical field of capacitor state monitoring and provides a traction transmission system direct-current side supporting capacitor state monitoring circuit and method. Thecircuit comprises a power source module, an impedance module, a rectification module, an RC harmonic module and an inverter. The method includes the following steps that: the output current of the rectification module and the input current of the inverter are calculated; capacitance current is calculated; a capacitance impedance expression is obtained; a capacitance current expression is obtained; differential processing is performed on the capacitance current; a capacitance current integral is obtained; and different band-pass filters are selected, voltage and current components are extracted, and the resistance ESR and capacitance C of a capacitor are solved. With the circuit and method of the invention adopted, the problem that a direct-current side capacitance current sensor is difficult to add can be solved, and the two aging characteristic parameters, resistance ESR and capacitance C of the capacitor are simultaneously monitored.
Description
technical field [0001] The invention relates to the technical field of capacitor state monitoring, in particular to a circuit and a method for monitoring the state of a supporting capacitor on a DC side of a traction drive system. Background technique [0002] Capacitors are widely used in power electronic systems, and with high failure rate, they bring risks to the healthy and stable operation of the system. In the rail transit traction drive system, capacitors are used as DC side support capacitors to filter and balance power differences. Their reliability is related to the healthy operation of the entire system. Therefore, it is very important to monitor the status of DC side support capacitors. [0003] The equivalent circuit model of an electrolytic capacitor is as figure 1 As shown, the capacitance value C and the equivalent series resistance ESR change most obviously during the aging process of the capacitor, so these two parameters are selected as the indicators for...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R27/02G01R27/26
CPCG01R31/00G01R27/02G01R27/2605
Inventor 方晓春都佳美
Owner 重庆中涪科瑞工业技术研究院有限公司