CN110646698B - Method for obtaining electromagnetic compatibility of traction system of motor train unit - Google Patents
Method for obtaining electromagnetic compatibility of traction system of motor train unit Download PDFInfo
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- CN110646698B CN110646698B CN201910957918.8A CN201910957918A CN110646698B CN 110646698 B CN110646698 B CN 110646698B CN 201910957918 A CN201910957918 A CN 201910957918A CN 110646698 B CN110646698 B CN 110646698B
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Abstract
The invention discloses a method for obtaining electromagnetic compatibility of a traction system of a motor train unit, which is characterized in that an object-oriented method is used for establishing an electromagnetic compatibility object model of the traction system of the high-speed motor train unit, and further establishing a system-level electromagnetic compatibility model of the high-speed motor train unit, the influence of IGBT aging characteristic parameters on the electromagnetic compatibility of the traction system of the high-speed motor train unit is analyzed and evaluated by using an electromagnetic compatibility principle and a high-speed motor train unit traction system conducted EMI analysis method, so that the current situation that only the aging characteristic of IGBT devices and the service lives of the devices are analyzed singly is broken through, the analysis and prediction of the electromagnetic compatibility of the traction system of the motor train unit can be realized, and the electromagnetic compatibility safety of the motor train unit is guaranteed.
Description
Technical Field
The invention relates to the field of performance detection of a motor train unit, in particular to a method for acquiring electromagnetic compatibility of a traction system of the motor train unit.
Background
After a high-power semiconductor device of a high-speed train is operated for a long time, due to the action of various external or internal environments, the performance and grounding quality of part of components are changed, so that the electromagnetic compatibility characteristic of equipment is changed, the change of the electromagnetic compatibility can cause the instability of a system, and potential safety hazards exist. For example, when a key device IGBT in a train converter system is used, the key device IGBT can be affected by thermal shock, collision, extrusion and the like of the surrounding working environment, meanwhile, a large amount of Joule heat can be generated by frequent switching of the device IGBT, fatigue and aging of welding materials among different structures of the device can be accelerated by long-term power cycle impact, a series of temperature-sensitive electrical parameters are changed, meanwhile, parasitic parameters are changed, the electromagnetic compatibility of a working circuit of the device is greatly affected by the change of the parasitic parameters, and therefore the electromagnetic compatibility performance of the high-speed train converter system is affected.
Disclosure of Invention
Aiming at the defects in the prior art, the method for acquiring the electromagnetic compatibility of the traction system of the motor train unit can effectively analyze the influence of the aging of the IGBT on the electromagnetic compatibility of the working circuit of the motor train unit.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the method for obtaining the electromagnetic compatibility of the traction system of the motor train unit comprises the following steps:
s1, analyzing the change of the characteristic parameters of the aged IGBT and the influence of the change on the working characteristics of the IGBT according to the working principle of the IGBT;
s2, establishing an IGBT electromagnetic compatibility equivalent circuit model according to the circuit structure of the IGBT;
s3, in the IGBT electromagnetic compatibility equivalent circuit model, acquiring aging characteristic parameters which affect the electromagnetic compatibility of the circuit of the IGBT system by adopting an electromagnetic compatibility principle analysis method;
s4, establishing an electromagnetic compatibility object model of the motor train unit traction system by adopting an object-oriented method according to the motor train unit traction system principle;
s5, establishing a motor train unit electromagnetic compatibility model according to the electromagnetic compatibility object model of the motor train unit traction system;
s6, taking the aging characteristic parameters which affect the electromagnetic compatibility of the IGBT system circuit as variables of the electromagnetic compatibility model of the motor train unit, and obtaining the electromagnetic compatibility of the traction system in the electromagnetic compatibility model of the motor train unit.
Further, the specific method of step S1 is:
the IGBT is aged under the actions of thermal shock, collision, extrusion and self switching; and acquiring characteristic parameters of the aged IGBT and influences on the working characteristics of the IGBT by adopting a thermodynamic theory according to the internal structure and material characteristics of the IGBT.
Further, the IGBT operating characteristics in step S1 include the switching speed of the IGBT, the threshold voltage of the IBGT, the on-state voltage drop of the IGBT, and the inter-electrode parasitic parameters of the IGBT.
Further, the specific method of step S2 is:
according to the internal circuit structure of the IGBT, an NPN type triode in the IGBT is removed, the nonlinear capacitor is divided, an IGBT equivalent circuit with parasitic parameters is obtained, and an IGBT electromagnetic compatibility equivalent circuit model is obtained.
Further, the specific method of step S4 is:
according to the principle of a traction system of the motor train unit, an electromagnetic compatibility object model of the traction system of the motor train unit is obtained by establishing a power supply, a traction transformer, a traction rectifier, an intermediate direct-current circuit, a traction inverter, a traction rectifier and a control circuit of the traction inverter and a motor equivalent load.
Furthermore, the network side voltage of an electromagnetic compatibility object model of the motor train unit traction system is 25kV, the control circuits of the traction rectifier and the traction inverter adopt PWM control, and the power supply mode is AC-DC-AC.
Further, the specific method of step S5 is:
optimizing the electromagnetic compatibility of a traction system model of the motor train unit according to an analysis method of common-mode and differential-mode conducted EMI coupling paths in the traction system of the high-speed motor train unit to obtain an electromagnetic compatibility model of the motor train unit; the optimization objects specifically comprise a traction transformer, a traction rectifier, an intermediate direct-current circuit, a traction inverter, a motor equivalent load and a capacitive coupling path.
Further, the traction rectifier is a four-quadrant pulse rectifier.
The invention has the beneficial effects that: according to the method, the object model of the electromagnetic compatibility of the traction system of the high-speed motor train unit is established by using an object-oriented method, the electromagnetic compatibility model of the system level of the high-speed motor train unit is further established, the influence of the IGBT aging characteristic parameters on the electromagnetic compatibility of the traction system of the high-speed motor train unit is analyzed and evaluated by using an electromagnetic compatibility principle and a high-speed motor train unit traction system conducted EMI analysis method, the current situation that only the aging characteristic of an IGBT device and the service life of the device are analyzed singly is broken, the analysis and prediction of the electromagnetic compatibility of the traction system of the motor train unit can be realized, and the electromagnetic compatibility safety of the motor train unit is guaranteed.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic diagram of an equivalent circuit model for IGBT electromagnetic compatibility;
FIG. 3 is a schematic diagram of an electromagnetic compatibility object model of a traction system of a motor train unit;
FIG. 4 is a schematic diagram of an electromagnetic compatibility model of a motor train unit;
FIG. 5 is a control circuit of an inverter in an electromagnetic compatibility model of a motor train unit;
FIG. 6 is a comparison graph of the frequency spectrum results of the system conducted common mode voltage before and after the IGBT is aged in the frequency range of 10kHz-3 MHz;
FIG. 7 is a comparison graph of the frequency spectrum results of the conducted common mode voltage of the system before and after the IGBT is aged in the high frequency band of 0.08-2.7 GHz;
FIG. 8 is a comparison graph of the system conduction differential mode voltage spectrum results before and after IGBT aging.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, the method for obtaining the electromagnetic compatibility of the traction system of the motor train unit includes the following steps:
s1, analyzing the change of the characteristic parameters of the aged IGBT and the influence of the change on the working characteristics of the IGBT according to the working principle of the IGBT;
s2, establishing an IGBT electromagnetic compatibility equivalent circuit model according to the circuit structure of the IGBT;
s3, in the IGBT electromagnetic compatibility equivalent circuit model, acquiring aging characteristic parameters which affect the electromagnetic compatibility of the circuit of the IGBT system by adopting an electromagnetic compatibility principle analysis method;
s4, establishing an electromagnetic compatibility object model of the motor train unit traction system by adopting an object-oriented method according to the motor train unit traction system principle;
s5, establishing a motor train unit electromagnetic compatibility model according to the electromagnetic compatibility object model of the motor train unit traction system;
s6, taking the aging characteristic parameters which affect the electromagnetic compatibility of the IGBT system circuit as variables of the electromagnetic compatibility model of the motor train unit, and obtaining the electromagnetic compatibility of the traction system in the electromagnetic compatibility model of the motor train unit.
The specific method of step S1 is: the IGBT is aged under the actions of thermal shock, collision, extrusion and self switching; and acquiring characteristic parameters of the aged IGBT and influences on the working characteristics of the IGBT by adopting a thermodynamic theory according to the internal structure and material characteristics of the IGBT. The IGBT operating characteristics in step S1 include the switching speed of the IGBT, the threshold voltage of the IBGT, the on-state voltage drop of the IGBT, and the inter-electrode parasitic parameters of the IGBT.
The specific method of step S2 is: according to the internal circuit structure of the IGBT, an NPN type triode in the IGBT is removed, the nonlinear capacitor is divided, an IGBT equivalent circuit with parasitic parameters is obtained, and an IGBT electromagnetic compatibility equivalent circuit model is obtained.
The specific method of step S4 is: according to the principle of a traction system of the motor train unit, an electromagnetic compatibility object model of the traction system of the motor train unit is obtained by establishing a power supply, a traction transformer, a traction rectifier, an intermediate direct-current circuit, a traction inverter, a traction rectifier and a control circuit of the traction inverter and a motor equivalent load. The network side voltage of an electromagnetic compatibility object model of the motor train unit traction system is 25kV, the control circuits of the traction rectifier and the traction inverter adopt PWM control, and the power supply mode is AC-DC-AC.
The specific method of step S5 is: optimizing the electromagnetic compatibility of a traction system model of the motor train unit according to an analysis method of common-mode and differential-mode conducted EMI coupling paths in the traction system of the high-speed motor train unit to obtain an electromagnetic compatibility model of the motor train unit; the optimization objects specifically comprise a traction transformer, a traction rectifier, an intermediate direct-current circuit, a traction inverter, a motor equivalent load and a capacitive coupling path. The traction rectifier is a four-quadrant pulse rectifier.
In one embodiment of the present invention, fig. 2 provides a schematic diagram of an equivalent circuit model of an IGBT electromagnetic compatibility. Fig. 3 provides an object model of electromagnetic compatibility of a traction system of a high-speed motor train unit, the model adopts an 'ac-dc-ac' power supply mode, the voltage of a grid side is 25kV, a converter adopts a two-level structure, two four-quadrant pulse rectifiers are connected in parallel, an intermediate dc link comprises an LC filter and a support capacitor, a traction rectifier and a traction inverter control strategy adopts PWM control, and a control circuit thereof is shown in fig. 4 and 5. The load end adopts simple Y-shaped three-phase resistive load. The model abstracts an IGBT component in a traction system of the high-speed motor train unit into one object by adopting an object-oriented method, and each object simultaneously has a node characteristic, an output channel characteristic and an input channel characteristic.
As shown in fig. 6, 7 and 8, the analysis result of the IGBT aging characteristic parameter is input to the electromagnetic compatibility model of the motor train unit as an object, and the system conduction common-mode and differential-mode voltage spectrum results before and after the IGBT aging are obtained. It can be seen that in the frequency band of 10kHz-3MHz, the amplitude of the common mode voltage is attenuated to-80 dBV from-10 dBV, and higher harmonics are accompanied, and the frequency spectrum of the conducted common mode voltage before and after aging has a certain deviation on certain frequency bands; in a high frequency band of 0.08-2.7GHz, the frequency spectrum amplitude of the conducted common-mode voltage is obviously increased after aging, and the common-mode interference is increased by about 10 dB. Within a frequency band of 10kHz-3MHz, the amplitude variation range of the differential mode voltage is-20 dBV to-100 dBV, the frequency spectrum of the differential mode voltage before and after aging is obviously increased within certain frequency bands, particularly the frequency spectrum amplitude of 200kHz to 400kHz and 600kHz to 2MHz is obviously increased, and the differential mode interference is increased by about 10 dB. The embodiment illustrates that the influence of the IGBT aging on the electromagnetic compatibility of the working circuit of the motor train unit can be effectively analyzed.
In summary, the invention establishes the electromagnetic compatibility object model of the traction system of the high-speed motor train unit by using an object-oriented method, further establishes the system-level electromagnetic compatibility model of the high-speed motor train unit, analyzes and evaluates the influence of the IGBT aging characteristic parameters on the electromagnetic compatibility of the traction system of the high-speed motor train unit by using an electromagnetic compatibility principle and a conducted EMI analysis method of the traction system of the high-speed motor train unit, breaks through the current situation that only the aging characteristic of an IGBT device and the service life of the device are analyzed singly, can realize the analysis and prediction of the electromagnetic compatibility of the traction system of the motor train unit, and ensures the electromagnetic compatibility safety of the motor train unit.
Claims (8)
1. A method for obtaining electromagnetic compatibility of a traction system of a motor train unit is characterized by comprising the following steps:
s1, analyzing the change of the characteristic parameters of the aged IGBT and the influence of the change on the working characteristics of the IGBT according to the working principle of the IGBT;
s2, establishing an IGBT electromagnetic compatibility equivalent circuit model according to the circuit structure of the IGBT;
s3, in the IGBT electromagnetic compatibility equivalent circuit model, acquiring aging characteristic parameters which affect the electromagnetic compatibility of the circuit of the IGBT system by adopting an electromagnetic compatibility principle analysis method;
s4, establishing an electromagnetic compatibility object model of the motor train unit traction system by adopting an object-oriented method according to the motor train unit traction system principle;
s5, establishing a motor train unit electromagnetic compatibility model according to the electromagnetic compatibility object model of the motor train unit traction system;
s6, taking the aging characteristic parameters which affect the electromagnetic compatibility of the IGBT system circuit as variables of the electromagnetic compatibility model of the motor train unit, and obtaining the electromagnetic compatibility of the traction system in the electromagnetic compatibility model of the motor train unit.
2. The method for obtaining the electromagnetic compatibility of the traction system of the motor train unit according to claim 1, wherein the specific method of the step S1 is as follows:
the IGBT is aged under the actions of thermal shock, collision, extrusion and self switching; and acquiring characteristic parameters of the aged IGBT and influences on the working characteristics of the IGBT by adopting a thermodynamic theory according to the internal structure and material characteristics of the IGBT.
3. The method for obtaining the electromagnetic compatibility performance of the traction system of the motor train unit according to claim 1 or 2, wherein the operating characteristics of the IGBTs in the step S1 include switching speeds of the IGBTs, threshold voltages of the IBGTs, on-state voltage drops of the IGBTs, and inter-electrode parasitic parameters of the IGBTs.
4. The method for obtaining the electromagnetic compatibility of the traction system of the motor train unit according to claim 1, wherein the specific method of the step S2 is as follows:
according to the internal circuit structure of the IGBT, an NPN type triode in the IGBT is removed, the nonlinear capacitor is divided, an IGBT equivalent circuit with parasitic parameters is obtained, and an IGBT electromagnetic compatibility equivalent circuit model is obtained.
5. The method for obtaining the electromagnetic compatibility of the traction system of the motor train unit according to claim 1, wherein the specific method of the step S4 is as follows:
according to the principle of a traction system of the motor train unit, an electromagnetic compatibility object model of the traction system of the motor train unit is obtained through a power supply, a traction transformer, a traction rectifier, an intermediate direct-current circuit, a traction inverter, a control circuit of the traction rectifier and the traction inverter and a motor equivalent load.
6. The method for obtaining the electromagnetic compatibility of the traction system of the motor train unit according to claim 5, wherein the network side voltage of the electromagnetic compatibility object model of the traction system of the motor train unit is 25kV, the control circuits of the traction rectifier and the traction inverter adopt PWM control, and the power supply mode is AC-DC-AC.
7. The method for obtaining the electromagnetic compatibility of the traction system of the motor train unit according to claim 5, wherein the specific method of the step S5 is as follows:
optimizing the electromagnetic compatibility of a traction system model of the motor train unit according to an analysis method of common-mode and differential-mode conducted EMI coupling paths in the traction system of the high-speed motor train unit to obtain an electromagnetic compatibility model of the motor train unit; the optimization objects specifically comprise a traction transformer, a traction rectifier, an intermediate direct-current circuit, a traction inverter, a motor equivalent load and a capacitive coupling path.
8. The method for obtaining the electromagnetic compatibility performance of the traction system of the motor train unit according to claim 5 or 7, wherein the traction rectifier is a four-quadrant pulse rectifier.
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| CN112557860A (en) * | 2020-11-02 | 2021-03-26 | 中国南方电网有限责任公司超高压输电公司广州局 | Aging method of IGBT switch of buck converter circuit under power frequency |
| CN112444711A (en) * | 2020-12-09 | 2021-03-05 | 电子科技大学 | IGBT parallel system health assessment method based on electromagnetic radiation |
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