A method of, system for, and related components for excitation control of a main generator

Abstract

The application discloses a main generator excitation control method, system and related components, the method comprises the following steps: obtaining the real-time power of the traction motor and the traction gear; determining the first excitation trigger angle according to the real-time power and the traction gear; obtaining the real-time intermediate voltage of the intermediate DC circuit; determining the second excitation trigger angle through the PI regulator according to the real-time intermediate voltage and the preset intermediate voltage of the intermediate DC circuit; summing the first excitation trigger angle and the second excitation trigger angle to obtain the action excitation trigger angle, so that the auxiliary generation rectifier bridge works according to the action excitation trigger angle. This method can quickly determine the first excitation trigger angle, then obtain the second excitation trigger angle, and finally determine the action excitation trigger angle to make the auxiliary generation rectifier bridge work. The oscillation time is short, the real-time intermediate voltage of the intermediate DC circuit can be stabilized relatively quickly, the effects of high precision and high response speed are achieved, and finally the efficient regulation of the main generator excitation control is realized.

Description

Technical Field

[0001] This invention relates to the field of generator control, and in particular to an excitation control method, system and related components for a main generator. Background Technology

[0002] Currently, the main generator is a key piece of equipment in diesel locomotives, driven by a diesel engine to generate three-phase AC power to supply the locomotive's traction converter. The excitation system is used to adjust the excitation current of the main generator in a timely manner to maintain the intermediate DC voltage of the traction converter. Whether the intermediate DC voltage can remain constant is crucial to the stability and reliability of the entire diesel engine traction system.

[0003] Traditional excitation systems typically use feedback from the current, power, or voltage of the downstream traction converter for PI regulation to adjust the firing angle of the excitation current. This feedback method can ultimately achieve high-precision results, but the required feedback parameters can only be obtained after the traction system has been running for a period of time, resulting in a slow adjustment speed.

[0004] Therefore, how to provide a solution to the above-mentioned technical problems is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a highly efficient and fast excitation control method, system, and related components for a main generator. The specific solution is as follows:

[0006] An excitation control method for a main generator is applied to an excitation drive system, the excitation drive system comprising, in sequence, an auxiliary generator, an auxiliary generator rectifier bridge, a main generator, a main generator rectifier bridge, an intermediate DC circuit, a traction inverter, and a traction motor, the excitation control method comprising:

[0007] Obtain the real-time power and traction level of the traction motor;

[0008] The first excitation trigger angle is determined based on the real-time power and the traction stage position;

[0009] Obtain the real-time intermediate voltage of the intermediate DC circuit;

[0010] The second excitation trigger angle is determined by a PI regulator based on the real-time intermediate voltage and the preset intermediate voltage of the intermediate DC circuit.

[0011] The first excitation trigger angle and the second excitation trigger angle are summed to obtain the operating excitation trigger angle, so that the auxiliary generator rectifier bridge operates according to the operating excitation trigger angle.

[0012] Preferably, the process of determining the first excitation firing angle based on the real-time power and the traction stage position specifically includes:

[0013] Based on the traction level, determine the preset intermediate voltage, the preset speed of the diesel engine connected to the auxiliary generator, and the preset output voltage of the auxiliary generator;

[0014] The first excitation trigger angle is determined based on the real-time power, the preset rotational speed, the preset intermediate voltage, and the preset output voltage.

[0015] Preferably, after determining the first excitation trigger angle based on the real-time power and the traction stage position, the method further includes:

[0016] The first excitation trigger angle is corrected based on the speed correction coefficient and / or voltage correction coefficient;

[0017] The speed correction coefficient is specifically a correction coefficient that is positively correlated with the real-time speed of the diesel engine and is 1 when the real-time speed is equal to the preset speed;

[0018] The voltage correction factor is specifically a correction factor that 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.

[0019] Preferably, the speed correction coefficient is linearly positively correlated with the real-time speed, and the voltage correction coefficient is linearly positively correlated with the real-time output voltage.

[0020] Preferably, the process of determining the first excitation firing angle based on the real-time power and the traction stage position specifically includes:

[0021] The first excitation trigger angle corresponding to the real-time power and traction stage is determined by consulting the test data table.

[0022] Preferably, the process of determining the first excitation firing angle based on the real-time power and the traction stage position specifically includes:

[0023] The first excitation trigger angle corresponding to the real-time power and traction stage position is determined by steady-state calculation.

[0024] Accordingly, this application also discloses an excitation control system for a main generator, applied to an excitation drive system. The excitation drive system includes, in sequence, an auxiliary generator, an auxiliary generator rectifier bridge, a main generator, a main generator rectifier bridge, an intermediate DC circuit, a traction inverter, and a traction motor. The excitation control system includes:

[0025] The acquisition module is used to acquire the real-time power and traction level of the traction motor, and also to acquire the real-time intermediate voltage of the intermediate DC circuit.

[0026] The first data module is used to determine the first excitation trigger angle based on the real-time power and the traction stage position;

[0027] The second data module is used to determine the second excitation trigger angle by means of a PI regulator based on the real-time intermediate voltage and the preset intermediate voltage of the intermediate DC circuit.

[0028] The third data module is used to sum the first excitation trigger angle and the second excitation trigger angle to obtain the action excitation trigger angle, so that the auxiliary generator rectifier bridge works according to the action excitation trigger angle.

[0029] Preferably, the first data module is specifically used for:

[0030] Based on the traction level, determine the preset intermediate voltage, the preset speed of the diesel engine connected to the auxiliary generator, and the preset output voltage of the auxiliary generator;

[0031] The first excitation trigger angle is determined based on the real-time power, the preset rotational speed, the preset intermediate voltage, and the preset output voltage.

[0032] Preferably, the first data module is further used for:

[0033] The first excitation trigger angle is corrected based on the speed correction coefficient and / or voltage correction coefficient;

[0034] The speed correction coefficient is specifically a correction coefficient that is positively correlated with the real-time speed of the diesel engine and is 1 when the real-time speed is equal to the preset speed;

[0035] The voltage correction factor is specifically a correction factor that 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.

[0036] Preferably, the speed correction coefficient is linearly positively correlated with the real-time speed, and the voltage correction coefficient is linearly positively correlated with the real-time output voltage.

[0037] Preferably, the first data module is specifically used for:

[0038] The first excitation trigger angle corresponding to the real-time power and traction stage is determined by consulting the test data table.

[0039] Preferably, the first data module is specifically used for:

[0040] The first excitation trigger angle corresponding to the real-time power and traction stage position is determined by steady-state calculation.

[0041] Accordingly, this application also discloses an excitation control device for a main generator, comprising:

[0042] Memory, used to store computer programs;

[0043] A processor for executing the computer program to implement the steps of the excitation control method for the main generator as described in any of the preceding descriptions.

[0044] Accordingly, this application also discloses a readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the excitation control method for the main generator as described in any of the above claims.

[0045] Accordingly, this application also discloses a diesel locomotive, including:

[0046] Excitation drive system;

[0047] The excitation control device for the main generator as described above;

[0048] The excitation drive system includes an auxiliary generator, an auxiliary generator rectifier bridge, a main generator, a main generator rectifier bridge, an intermediate DC circuit, a traction inverter, and a traction motor connected in sequence.

[0049] This application discloses an excitation control method for a main generator, comprising: acquiring the real-time power and traction stage position of the traction motor; determining a first excitation trigger angle based on the real-time power and traction stage position; acquiring the real-time intermediate voltage of the intermediate DC circuit; determining a second excitation trigger angle using a PI regulator based on the real-time intermediate voltage and a preset intermediate voltage of the intermediate DC circuit; and summing the first and second excitation trigger angles to obtain an operating excitation trigger angle, so that the auxiliary generator rectifier bridge operates according to the operating excitation trigger angle. This method can quickly determine the first excitation trigger angle, then acquire the second excitation trigger angle, and finally determine the operating excitation trigger angle to make the auxiliary generator rectifier bridge operate. It has a short oscillation time and can quickly stabilize the real-time intermediate voltage of the intermediate DC circuit, achieving high precision and high response speed, ultimately realizing efficient regulation of the main generator excitation control. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0051] Figure 1 This is a structural distribution diagram of the excitation drive system in an embodiment of the present invention;

[0052] Figure 2 This is a flowchart of the excitation control method for the main generator in an embodiment of the present invention;

[0053] Figure 3a This is a schematic diagram illustrating the relationship of the speed correction coefficients in an embodiment of the present invention;

[0054] Figure 3b This is a schematic diagram illustrating the relationship of voltage correction coefficients in an embodiment of the present invention;

[0055] Figure 4 This is a control principle diagram of the excitation control method in an embodiment of the present invention;

[0056] Figure 5a The waveform diagram shows the parameter changes of the traditional excitation control method.

[0057] Figure 5b This is a waveform diagram showing the parameter changes in an embodiment of the present invention;

[0058] Figure 6 This is a structural distribution diagram of the excitation control system of the main generator in an embodiment of the present invention;

[0059] Figure 7 This is a structural distribution diagram of an internal combustion locomotive according to an embodiment of the present invention. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] Traditional excitation systems typically use feedback from the current, power, or voltage of the downstream traction converter for PI regulation to adjust the firing angle of the excitation current. This feedback method can ultimately achieve high-precision results, but the required feedback parameters can only be obtained after the traction system has been running for a period of time, resulting in a slow adjustment speed.

[0062] This application can quickly determine the first excitation trigger angle, then obtain the second excitation trigger angle, and finally determine the action excitation trigger angle to make the auxiliary generator rectifier bridge work. The oscillation time is short, and the real-time intermediate voltage of the intermediate DC circuit can be stabilized relatively quickly, achieving the effect of high precision and high response speed, and finally realizing the efficient regulation of the main generator excitation control.

[0063] This invention discloses an excitation control method for a main generator, applied to an excitation drive system. (See also...) Figure 1As shown, the excitation drive system includes an auxiliary generator GS1, an auxiliary generator rectifier bridge 01, a main generator GS2, a main generator rectifier bridge 02, an intermediate DC circuit 03, a traction inverter 04, and a traction motor M connected in sequence. (See also...) Figure 2 As shown, the excitation control method includes:

[0064] S1: Obtain the real-time power and traction level of the traction motor M;

[0065] S2: Determine the first excitation trigger angle based on real-time power and traction stage position;

[0066] Specifically, step S2, which involves determining the first excitation firing angle based on real-time power and traction stage position, includes:

[0067] Based on the traction level, determine the preset speed, preset intermediate voltage, and preset output voltage of the diesel engine connected to the auxiliary generator GS1.

[0068] The first excitation trigger angle is determined based on real-time power, preset speed, preset intermediate voltage, and preset output voltage.

[0069] It is understandable that the traction stage corresponding to the traction motor M actually corresponds to the locomotive's operating speed. Each traction stage corresponds to a predetermined preset speed of the diesel engine, a preset intermediate voltage of the intermediate DC circuit, and a preset output voltage of the auxiliary generator. With the traction stage determined, the real-time power of the traction motor changes with the locomotive's load. Therefore, the current first excitation trigger angle is determined based on the real-time power of the current traction stage. This first excitation trigger angle, as a feedforward trigger angle, is essentially the reference excitation trigger angle of the auxiliary generator rectifier bridge. In order to stabilize the intermediate DC voltage, the subsequent trigger angles of the auxiliary generator rectifier bridge are finely adjusted using this angle as a reference point.

[0070] Furthermore, considering the complex relationship between traction stage position, real-time power, and the first excitation trigger angle, the first excitation trigger angle can be determined by consulting the test data table for the corresponding real-time power and traction stage position, or by steady-state calculation. The test data table contains data determined through multiple test calibrations.

[0071] Furthermore, considering that there may be differences between the preset data corresponding to the traction level and the actual operating data, a correction coefficient is set here to correct the first excitation trigger angle. Specifically, the first excitation trigger angle is corrected according to the speed correction coefficient and / or voltage correction coefficient. The speed correction coefficient is specifically a correction coefficient that is positively correlated with the real-time speed of the diesel engine and is 1 when the real-time speed is equal to the preset speed. The voltage correction coefficient is specifically a correction coefficient that is positively correlated with the real-time output voltage of the auxiliary generator GS1 and is 1 when the real-time output voltage is equal to the preset output voltage.

[0072] Specifically, the positive correlation between the correction coefficient and the actual parameter can be set to linear positive correlation, i.e., the speed correction coefficient is linearly positively correlated with the real-time speed, and the voltage correction coefficient is linearly positively correlated with the real-time output voltage. Alternatively, it can be adjusted to other types of positive correlation based on actual needs or experimental data. For examples of linear positive correlation, see [link to documentation]. Figure 3a and Figure 3b As shown, Figure 3a In the middle, when the real-time speed of the diesel engine equals the preset speed n＝nN Speed ​​correction factor kn＝1 When the diesel engine speed n In n1＜n＜n2 At that time, speed correction coefficient kn Existence Relationship kn1＜kn＜kn2 ;akin, Figure 3b In the middle, when the actual output voltage of the auxiliary generator GS1 is equal to the preset output voltage u＝uN At that time, voltage correction factor ku＝1 When the actual output voltage u In u1＜u＜u2 At that time, voltage correction factor ku Existence Relationship ku1＜ku＜ku2 The first excitation trigger angle is corrected by multiplying the initial first excitation trigger angle by a speed correction factor and / or a voltage correction factor.

[0073] S3: Obtain the real-time intermediate voltage of intermediate DC circuit 03;

[0074] S4: Determine the second excitation trigger angle through the PI regulator based on the real-time intermediate voltage and the preset intermediate voltage of the intermediate DC circuit 03;

[0075] It is understandable that steps S3 and S4 are a feedback adjustment, which obtains the second excitation trigger angle to adjust the disturbance after passing through the PI regulator.

[0076] S5: Summing the first excitation trigger angle and the second excitation trigger angle yields the action excitation trigger angle, so that the auxiliary generator rectifier bridge 01 operates according to the action excitation trigger angle.

[0077] For details on the control principle of the entire excitation control method, please refer to [link / reference]. Figure 4 As shown, it can be understood that if the first excitation trigger angle is corrected, the angle added to the second excitation trigger angle in step S5 is the corrected first excitation trigger angle.

[0078] Understandably, the feedforward method is an open-loop control, which has the advantage of fast adjustment speed but lower accuracy. The feedback method is a closed-loop control, which has the advantages of no steady-state error and high accuracy, but the adjustment depends on parameter feedback and the adjustment speed is slow. This embodiment combines the first excitation trigger angle in the feedforward method and the second excitation trigger angle in the feedback method to achieve a balance between high response speed and high control accuracy in excitation regulation, ultimately achieving efficient regulation of the main generator excitation and ensuring the stability of the intermediate DC voltage. See also Figure 5a and Figure 5b As shown, Figure 5a The waveforms of the excitation trigger angle alfa and the intermediate DC voltage ud1 when the power of the traction motor M suddenly increases, as defined by the traditional excitation control method. Figure 5b The waveforms of the excitation trigger angle alffa and the intermediate DC voltage ud1 when the power of the traction motor M suddenly increases are shown in this embodiment. It can be clearly seen that when the power of the traction motor M suddenly increases, the excitation in this embodiment stabilizes to the new trigger angle more quickly, the adjustment speed is faster, and the intermediate DC voltage stabilizes back to its original value more quickly. The intermediate DC voltage drops less during the adjustment process. Therefore, the method of this embodiment enhances the dynamic response capability of the excitation control, which is very helpful in improving the stability and reliability of the internal combustion locomotive.

[0079] This application discloses an excitation control method for a main generator, comprising: acquiring the real-time power and traction stage position of the traction motor; determining a first excitation trigger angle based on the real-time power and traction stage position; acquiring the real-time intermediate voltage of the intermediate DC circuit; determining a second excitation trigger angle using a PI regulator based on the real-time intermediate voltage and a preset intermediate voltage of the intermediate DC circuit; and summing the first and second excitation trigger angles to obtain an operating excitation trigger angle, so that the auxiliary generator rectifier bridge operates according to the operating excitation trigger angle. This method can quickly determine the first excitation trigger angle, then acquire the second excitation trigger angle, and finally determine the operating excitation trigger angle to make the auxiliary generator rectifier bridge operate. It has a short oscillation time and can quickly stabilize the real-time intermediate voltage of the intermediate DC circuit, achieving high precision and high response speed, ultimately realizing efficient regulation of the main generator excitation control.

[0080] Accordingly, this application also discloses an excitation control system for a main generator, applied to an excitation drive system. The excitation drive system includes an auxiliary generator, an auxiliary generator rectifier bridge, a main generator, a main generator rectifier bridge, an intermediate DC circuit, a traction inverter, and a traction motor connected in sequence. (See also...) Figure 6As shown, the excitation control system includes:

[0081] The acquisition module 10 is used to acquire the real-time power and traction level of the traction motor, and also to acquire the real-time intermediate voltage of the intermediate DC circuit.

[0082] The first data module 11 is used to determine the first excitation trigger angle based on the real-time power and the traction stage position;

[0083] The second data module 12 is used to determine the second excitation trigger angle by means of a PI regulator based on the real-time intermediate voltage and the preset intermediate voltage of the intermediate DC circuit.

[0084] The third data module 13 is used to sum the first excitation trigger angle and the second excitation trigger angle to obtain the action excitation trigger angle, so that the auxiliary generator rectifier bridge works according to the action excitation trigger angle.

[0085] In this embodiment, the first excitation trigger angle can be quickly determined, and then the second excitation trigger angle can be obtained. Finally, the action excitation trigger angle is determined to make the auxiliary generator rectifier bridge work. The oscillation time is short, and the real-time intermediate voltage of the intermediate DC circuit can be stabilized relatively quickly, achieving the effect of high precision and high response speed, and finally realizing the efficient regulation of the main generator excitation control.

[0086] In some specific embodiments, the first data module 11 is specifically used for:

[0087] Based on the traction level, determine the preset intermediate voltage, the preset speed of the diesel engine connected to the auxiliary generator, and the preset output voltage of the auxiliary generator;

[0088] The first excitation trigger angle is determined based on the real-time power, the preset rotational speed, the preset intermediate voltage, and the preset output voltage.

[0089] In some specific embodiments, the first data module 11 is further configured to:

[0090] The first excitation trigger angle is corrected based on the speed correction coefficient and / or voltage correction coefficient;

[0091] The speed correction coefficient is specifically a correction coefficient that is positively correlated with the real-time speed of the diesel engine and is 1 when the real-time speed is equal to the preset speed;

[0092] The voltage correction factor is specifically a correction factor that 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.

[0093] In some specific embodiments, the speed correction coefficient is linearly positively correlated with the real-time speed, and the voltage correction coefficient is linearly positively correlated with the real-time output voltage.

[0094] In some specific embodiments, the first data module 11 is specifically used for:

[0095] The first excitation trigger angle corresponding to the real-time power and traction stage is determined by consulting the test data table.

[0096] In some specific embodiments, the first data module 11 is specifically used for:

[0097] The first excitation trigger angle corresponding to the real-time power and traction stage position is determined by steady-state calculation.

[0098] Accordingly, embodiments of this application also disclose an excitation control device for a main generator, comprising:

[0099] Memory, used to store computer programs;

[0100] A processor is used to execute the computer program to implement the steps of the excitation control method for the main generator as described in any of the embodiments above.

[0101] Accordingly, embodiments of this application also disclose a readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the excitation control method for the main generator as described in any of the embodiments above.

[0102] It is understood that the detailed description of the excitation control method of the main generator described in this embodiment can be found in the specific content of the above embodiment, and will not be repeated here.

[0103] It is understood that the excitation control device and readable storage medium of the main generator described in this embodiment have the same technical effects as the excitation control method of the main generator described in the previous embodiment, and will not be repeated here.

[0104] Accordingly, this application also discloses an internal combustion engine vehicle, see [link to relevant documentation]. Figure 7 As shown, it includes:

[0105] Excitation drive system 20;

[0106] The excitation control device 21 of the main generator as described above;

[0107] The excitation drive system 20 includes an auxiliary generator GS1, an auxiliary generator rectifier bridge 01, a main generator GS2, a main generator rectifier bridge 02, an intermediate DC circuit 03, a traction inverter 04, and a traction motor M connected in sequence.

[0108] It is understood that the detailed description of the excitation control device of the main generator described in this embodiment can be found in the specific content of the above embodiment, and will not be repeated here.

[0109] It is understood that the diesel locomotive in this embodiment has the same technical effect as the excitation control system of the main generator described in the previous embodiment, and will not be repeated here.

[0110] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0111] The excitation control method, system, and related components of a main generator provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An excitation control method for a main generator, characterized in that, The method is applied to an excitation drive system, which includes an auxiliary generator, an auxiliary generator rectifier bridge, a main generator, a main generator rectifier bridge, an intermediate DC circuit, a traction inverter, and a traction motor connected in sequence. The excitation control method includes: Obtain the real-time power and traction level of the traction motor; The first excitation trigger angle is determined based on the real-time power and the traction stage position; Obtain the real-time intermediate voltage of the intermediate DC circuit; The second excitation trigger angle is determined by a PI regulator based on the real-time intermediate voltage and the preset intermediate voltage of the intermediate DC circuit. The first excitation trigger angle and the second excitation trigger angle are summed to obtain the action excitation trigger angle, so that the auxiliary generator rectifier bridge operates according to the action excitation trigger angle; The process of determining the first excitation firing angle based on the real-time power and the traction stage position specifically includes: Based on the traction level, determine the preset intermediate voltage, the preset speed of the diesel engine connected to the auxiliary generator, and the preset output voltage of the auxiliary generator; The first excitation trigger angle is determined based on the real-time power, the preset rotational speed, the preset intermediate voltage, and the preset output voltage. After determining the first excitation trigger angle based on the real-time power and the traction stage position, the method further includes: The first excitation trigger angle is corrected based on the speed correction coefficient and / or voltage correction coefficient; The speed correction coefficient is specifically a correction coefficient that is positively correlated with the real-time speed of the diesel engine and is 1 when the real-time speed is equal to the preset speed; The voltage correction factor is specifically a correction factor that 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 speed correction coefficient is linearly positively correlated with the real-time speed, and the voltage correction coefficient is linearly positively correlated with the real-time output voltage.

3. The excitation control method according to claim 1, characterized in that, The process of determining the first excitation firing angle based on the real-time power and the traction stage position specifically includes: The first excitation trigger angle corresponding to the real-time power and traction stage is determined by consulting the test data table.

4. The excitation control method according to claim 1, characterized in that, The process of determining the first excitation firing angle based on the real-time power and the traction stage position specifically includes: The first excitation trigger angle corresponding to the real-time power and traction stage position is determined by steady-state calculation.

5. An excitation control system for a main generator, characterized in that, This is applied to an excitation drive system, which includes an auxiliary generator, an auxiliary generator rectifier bridge, a main generator, a main generator rectifier bridge, an intermediate DC circuit, a traction inverter, and a traction motor connected in sequence. The excitation control system includes: The acquisition module is used to acquire the real-time power and traction level of the traction motor, and also to acquire the real-time intermediate voltage of the intermediate DC circuit. The first data module is used to determine the first excitation trigger angle based on the real-time power and the traction stage position; The second data module is used to determine the second excitation trigger angle by means of a PI regulator based on the real-time intermediate voltage and the preset intermediate voltage of the intermediate DC circuit. The third data module is used to sum the first excitation trigger angle and the second excitation trigger angle to obtain the action excitation trigger angle, so that the auxiliary generator rectifier bridge works according to the action excitation trigger angle. The first data module is specifically used for: Based on the traction level, determine the preset intermediate voltage, the preset speed of the diesel engine connected to the auxiliary generator, and the preset output voltage of the auxiliary generator; The first excitation trigger angle is determined based on the real-time power, the preset rotational speed, the preset intermediate voltage, and the preset output voltage. The first data module is also used for: The first excitation trigger angle is corrected based on the speed correction coefficient and / or voltage correction coefficient; The speed correction coefficient is specifically a correction coefficient that is positively correlated with the real-time speed of the diesel engine and is 1 when the real-time speed is equal to the preset speed; The voltage correction factor is specifically a correction factor that 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 according to claim 5, characterized in that, The speed correction coefficient is linearly positively correlated with the real-time speed, and the voltage correction coefficient is linearly positively correlated with the real-time output voltage.

7. The excitation control system according to claim 5, characterized in that, The first data module is specifically used for: The first excitation trigger angle corresponding to the real-time power and traction stage is determined by consulting the test data table.

8. The excitation control system according to claim 5, characterized in that, The first data module is specifically used for: The first excitation trigger angle corresponding to the real-time power and traction stage position is determined by steady-state calculation.

9. An excitation control device for a main generator, characterized in that, include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the steps of the excitation control method for the main generator as described in any one of claims 1 to 4.

10. A readable storage medium, characterized in that, The readable storage medium stores a computer program that, when executed by a processor, implements the steps of the excitation control method for the main generator as described in any one of claims 1 to 4.

11. A diesel locomotive, characterized in that, include: Excitation drive system; The excitation control device for the main generator as described in claim 9; The excitation drive system includes an auxiliary generator, an auxiliary generator rectifier bridge, a main generator, a main generator rectifier bridge, an intermediate DC circuit, a traction inverter, and a traction motor connected in sequence.

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