CN-115706547-B - Excitation control method and system of main generator and related components

CN115706547BCN 115706547 BCN115706547 BCN 115706547BCN-115706547-B

Abstract

The application discloses an excitation control method, a system and related components of a main generator, wherein the method comprises the steps of obtaining real-time power and traction level of a traction motor; the method comprises the steps of determining a first excitation trigger angle according to real-time power and traction level, obtaining real-time intermediate voltage of an intermediate direct current loop, determining a second excitation trigger angle through a PI regulator according to the real-time intermediate voltage and preset intermediate voltage of the intermediate direct current loop, summing the first excitation trigger angle and the second excitation trigger angle to obtain an action excitation trigger angle, and enabling an auxiliary rectifier bridge to work according to the action excitation trigger angle. The method can quickly determine the first excitation trigger angle, then acquire the second excitation trigger angle, finally determine the action excitation trigger angle to enable the auxiliary rectifier bridge to work, has short oscillation time consumption, can quickly stabilize the real-time intermediate voltage of the intermediate direct current loop, achieves the effects of high precision and high response speed, and finally realizes the efficient adjustment of excitation control of the main generator.

Inventors

CHEN ZHIBO
HE LIANG
ZHAO JUNWEI
YANG GE
XIAO MENGYING
WU BAIHUA

Assignees

株洲中车时代电气股份有限公司

Dates

Publication Date: 20260512
Application Date: 20210817

Claims (11)

1. The utility model provides a excitation control method of main generator, its characterized in that is applied to excitation transmission system, excitation transmission system includes auxiliary generator, auxiliary rectifier bridge, main generator, main rectifier bridge, intermediate direct current return circuit, traction inverter and traction motor that connect gradually, excitation control method includes: acquiring real-time power and traction level of the traction motor; Determining a first excitation trigger angle according to the real-time power and the traction level; acquiring real-time intermediate voltage of the intermediate direct current loop; Determining a second excitation trigger angle through a PI regulator according to the real-time intermediate voltage and the preset intermediate voltage of the intermediate direct current loop; summing the first excitation trigger angle and the second excitation trigger angle to obtain an action excitation trigger angle so that the auxiliary rectifier bridge works according to the action excitation trigger angle; The process of determining the first excitation trigger angle according to the real-time power and the traction level specifically comprises the following steps: Determining the preset intermediate voltage, the preset rotating speed of the diesel engine connected with the auxiliary generator and the preset output voltage of the auxiliary generator according to the traction level; determining a first excitation trigger angle according to the real-time power, the preset rotating speed, the preset intermediate voltage and the preset output voltage; after the first excitation trigger angle is determined according to the real-time power and the traction level, the method further comprises the following steps: Correcting the first excitation trigger angle according to a rotation speed correction coefficient and/or a voltage correction coefficient; The rotational speed correction coefficient is specifically a correction coefficient positively correlated with the real-time rotational speed of the diesel engine, and is 1 when the real-time rotational speed is equal to the preset rotational speed; The voltage correction coefficient is specifically a correction coefficient which is positively correlated with the real-time output voltage of the auxiliary generator and is 1 when the real-time output voltage is equal to the preset output voltage.
2. The excitation control method according to claim 1, characterized in that the rotation speed correction coefficient is linearly and positively correlated with the real-time rotation speed, and the voltage correction coefficient is linearly and positively correlated with the real-time output voltage.
3. The excitation control method according to claim 1, wherein the determining the first excitation trigger angle based on the real-time power and the traction level comprises: and determining a first excitation trigger angle corresponding to the real-time power and the traction level by inquiring a test data table.
4. The excitation control method according to claim 1, wherein the determining the first excitation trigger angle based on the real-time power and the traction level comprises: and determining a first excitation trigger angle corresponding to the real-time power and the traction level through steady-state calculation.
5. The utility model provides a main generator's excitation control system, its characterized in that is applied to excitation transmission system, excitation transmission system includes auxiliary generator, auxiliary rectifier bridge, main generator, main rectifier bridge, intermediate direct current return circuit, traction inverter and traction motor that connect gradually, excitation control system includes: The acquisition module is used for acquiring the real-time power and the traction level of the traction motor and also used for acquiring the real-time intermediate voltage of the intermediate direct current loop; The first data module is used for determining a first excitation trigger angle according to the real-time power and the traction level; the second data module is used for determining a second excitation trigger angle through a PI regulator according to the real-time intermediate voltage and the preset intermediate voltage of the intermediate direct current loop; the third data module is used for summing the first excitation trigger angle and the second excitation trigger angle to obtain an action excitation trigger angle so that the auxiliary rectifier bridge works according to the action excitation trigger angle; The first data module is specifically configured to: Determining the preset intermediate voltage, the preset rotating speed of the diesel engine connected with the auxiliary generator and the preset output voltage of the auxiliary generator according to the traction level; determining a first excitation trigger angle according to the real-time power, the preset rotating speed, the preset intermediate voltage and the preset output voltage; the first data module is further configured to: Correcting the first excitation trigger angle according to a rotation speed correction coefficient and/or a voltage correction coefficient; The rotational speed correction coefficient is specifically a correction coefficient positively correlated with the real-time rotational speed of the diesel engine, and is 1 when the real-time rotational speed is equal to the preset rotational speed; The voltage correction coefficient is specifically a correction coefficient which is positively correlated with the real-time output voltage of the auxiliary generator and is 1 when the real-time output voltage is equal to the preset output voltage.
6. The excitation control system of claim 5 wherein the speed correction factor is linearly positively correlated with the real-time speed and the voltage correction factor is linearly positively correlated with the real-time output voltage.
7. The excitation control system of claim 5, wherein the first data module is specifically configured to: and determining a first excitation trigger angle corresponding to the real-time power and the traction level by inquiring a test data table.
8. The excitation control system of claim 5, wherein the first data module is specifically configured to: and determining a first excitation trigger angle corresponding to the real-time power and the traction level through steady-state calculation.
9. An excitation control device of a main generator, comprising: A memory for storing a computer program; A processor for implementing the steps of the excitation control method of the main generator according to any one of claims 1 to 4 when executing the computer program.
10. A readable storage medium, characterized in that the readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the excitation control method of a main generator as claimed in any one of claims 1 to 4.
11. An internal combustion locomotive, comprising: an excitation transmission system; The excitation control device of the main generator according to claim 9; The excitation transmission system comprises an auxiliary generator, an auxiliary rectifier bridge, a main generator, a main rectifier bridge, an intermediate direct current loop, a traction inverter and a traction motor which are sequentially connected.

Description

Excitation control method and system of main generator and related components Technical Field The invention relates to the field of generator control, in particular to an excitation control method, an excitation control system and related components of a main generator. Background Currently, a main generator is key equipment of an internal combustion locomotive, and is dragged by the diesel engine to generate three-phase alternating current for a traction converter of the locomotive to use. The exciting system is used for timely adjusting exciting current of the main generator so as to maintain the middle direct-current voltage of the traction converter, and whether the middle direct-current voltage is constant or not is related to stability and reliability of the whole internal combustion engine traction system. The traditional excitation system generally utilizes feedback of current, power or voltage of a rear-stage traction converter to carry out PI adjustment, so that the triggering angle of the excitation current is adjusted, and the feedback method can finally obtain a high-precision result, but the required feedback parameters can be obtained only after the traction system has been operated for a period of time, so that the adjustment speed is slower. Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art. Disclosure of Invention In view of the above, the present invention is directed to a method, a system and related components for controlling excitation of a main generator with high efficiency and rapidness. The specific scheme is as follows: an excitation control method of a main generator is applied to an excitation transmission system, the excitation transmission system comprises an auxiliary generator, an auxiliary rectifier bridge, a main generator, a main rectifier bridge, an intermediate direct current loop, a traction inverter and a traction motor which are sequentially connected, and the excitation control method comprises the following steps: acquiring real-time power and traction level of the traction motor; Determining a first excitation trigger angle according to the real-time power and the traction level; acquiring real-time intermediate voltage of the intermediate direct current loop; Determining a second excitation trigger angle through a PI regulator according to the real-time intermediate voltage and the preset intermediate voltage of the intermediate direct current loop; And summing the first excitation trigger angle and the second excitation trigger angle to obtain an action excitation trigger angle so that the auxiliary rectifier bridge works according to the action excitation trigger angle. Preferably, the process of determining the first excitation trigger angle according to the real-time power and the traction level specifically includes: Determining the preset intermediate voltage, the preset rotating speed of the diesel engine connected with the auxiliary generator and the preset output voltage of the auxiliary generator according to the traction level; and determining a first excitation trigger angle according to the real-time power, the preset rotating speed, the preset intermediate voltage and the preset output voltage. Preferably, after determining the first excitation trigger angle according to the real-time power and the traction level, the method further includes: Correcting the first excitation trigger angle according to a rotation speed correction coefficient and/or a voltage correction coefficient; The rotational speed correction coefficient is specifically a correction coefficient positively correlated with the real-time rotational speed of the diesel engine, and is 1 when the real-time rotational speed is equal to the preset rotational speed; The voltage correction coefficient is specifically a correction coefficient which is positively correlated with the real-time output voltage of the auxiliary generator and is 1 when the real-time output voltage is equal to the preset output voltage. Preferably, the rotation speed correction coefficient is linearly and positively correlated with the real-time rotation speed, and the voltage correction coefficient is linearly and positively correlated with the real-time output voltage. Preferably, the process of determining the first excitation trigger angle according to the real-time power and the traction level specifically includes: and determining a first excitation trigger angle corresponding to the real-time power and the traction level by inquiring a test data table. Preferably, the process of determining the first excitation trigger angle according to the real-time power and the traction level specifically includes: and determining a first excitation trigger angle corresponding to the real-time power and the traction level through steady-state calculation. Correspondingly, the application also discloses an excitation control system of the m