Oscillation suppression device and method for diesel-electric power system and diesel-electric power system

Abstract

The present invention discloses an oscillation suppression device and method of a diesel-electric power system and a diesel-electric power system, the device includes an oscillation suppression controller, the oscillation suppression controller collects the gear signal of the locomotive through a DI acquisition module; receives the speed signal sent by the engine through a CAN communication module; determines whether the engine speed oscillates according to the gear signal and the speed signal through an oscillation decision module, and generates mode control information and an oscillation control signal according to the oscillation judgment result; outputs the mode control information through a DO drive module to control the oscillation suppression mode to be enabled or disabled; and sends the oscillation control signal to the excitation controller through a CAN communication module. The present invention combines hard-wired signals and communication signals with each other, has high real-time performance, and ensures seamless switching between enabling and disabling the oscillation suppression mode; and uses CAN communication to send excitation control information to the excitation controller, which simply and efficiently realizes the dynamic power adjustment of the excitation system, thereby quickly suppressing the electromechanical oscillation of the entire system.

Description

Technical Field

[0001] The present invention relates to the technical field of engine control, and in particular to an oscillation suppression device and method for a diesel-electric power system and a diesel-electric power system. Background Art

[0002] In the fields of transportation, mining, metallurgy, etc., diesel-electric power systems mainly use the engine to drive the generator to provide power to the load.

[0003] In a diesel-electric power system, the generator generally collects analog electrical signals through an automatic voltage regulator to perform closed-loop regulation of the excitation current, thereby adjusting the generator terminal voltage to meet the real-time demand for output load power. The electric power of the entire diesel-electric power system depends on the mechanical power of the engine. When the load power changes significantly, it often causes the mechanical power to fail to respond to the electric power in a timely manner, and then the entire diesel-electric power system will experience electromechanical oscillations. Especially when the engine operates in a wide speed range, the engine is prone to wandering, and then the engine speed and electric power of the entire diesel-electric power system interact with each other. Existing solutions generally alleviate the oscillation phenomenon by compensating for the mechanical torque of the engine. This oscillation mitigation method is greatly affected by the mechanical characteristics of the entire diesel-electric power system, and is not conducive to quickly suppressing the oscillation phenomenon of the entire diesel-electric power system. Summary of the invention

[0004] The present invention provides an oscillation suppression device and method for a diesel-electric power system and a diesel-electric power system, so as to solve the problem that when the load power of the diesel-electric power system changes rapidly, the engine speed oscillates suddenly, and then the power of the whole system further oscillates.

[0005] Based on the above purpose, an embodiment of the present invention provides an oscillation suppression device for a diesel-electric power system, including an oscillation suppression controller, wherein the oscillation suppression controller includes a CAN communication module, a DI acquisition module, an oscillation decision module and a DO drive module;

[0006] The DI acquisition module is used to collect the gear position signal of the locomotive;

[0007] The CAN communication module is used to receive the speed signal sent by the engine;

[0008] The oscillation decision module is used to determine whether the engine speed oscillates according to the gear position signal collected by the DI acquisition module and the speed signal received by the CAN communication module, and generate mode control information and an oscillation control signal according to the oscillation determination result;

[0009] The DO driving module is used to output the mode control information generated by the oscillation decision module to control the oscillation suppression mode to be enabled or disabled;

[0010] The CAN communication module is also used to send the oscillation control signal generated by the oscillation decision module to the excitation controller.

[0011] Preferably, the oscillation suppression controller further includes a DC / DC converter, and the oscillation suppression device of the diesel-electric power system further includes a power filter and a cooling fan connected to the DC / DC converter.

[0012] Preferably, the oscillation suppression controller further comprises a power switch, one end of which is connected to the positive electrode of the external power supply, and the other end of which is connected to the positive input terminal of the power filter.

[0013] Preferably, the oscillation judgment result includes whether the engine speed oscillates or not; the mode control information includes a mode enable signal and a mode disable signal; the oscillation control signal includes an oscillation suppression parameter and a normal mode identifier;

[0014] The oscillation decision module includes an oscillation judgment unit, a first decision output unit, and a second decision output unit;

[0015] The oscillation determination unit is used to determine whether the engine speed is within a stable interval associated with the gear position signal;

[0016] The first decision unit is used to determine that the engine speed oscillates if the engine speed is outside the stable range, and to generate a mode enable signal and an oscillation suppression parameter;

[0017] The second decision unit is used to determine that the engine speed does not oscillate if the engine speed is within a stable range, and to generate a mode prohibition signal and a normal mode flag when a change in the handle gear position signal is detected.

[0018] Based on the same inventive concept, an embodiment of the present invention also provides a diesel-electric power system, including an engine, an excitation controller, a generator, a collection module and the above-mentioned oscillation suppression device, wherein the input end of the oscillation suppression device is connected to the engine, and the output end is connected to the excitation system.

[0019] Based on the same inventive concept, an embodiment of the present invention further provides an oscillation suppression method for a diesel-electric power system, wherein the oscillation suppression method for a diesel-electric power system is applied to the oscillation suppression device for the diesel-electric power system, comprising:

[0020] The oscillation suppression controller collects the gear position signal of the locomotive through the DI acquisition module;

[0021] The oscillation suppression controller receives a speed signal sent by the engine through a CAN communication module;

[0022] The oscillation suppression controller determines whether the engine speed oscillates according to the gear position signal and the speed signal, and generates mode control information and excitation control information according to the oscillation determination result;

[0023] The oscillation suppression controller outputs the mode control information through a DO driving module;

[0024] The oscillation suppression controller sends excitation control information to the excitation controller through the CAN communication module.

[0025] Preferably, the oscillation suppression controller determines whether the engine speed oscillates according to the gear signal and the speed signal, and generates mode control information and excitation control information according to the oscillation determination result, including:

[0026] The oscillation suppression controller determines whether the engine speed is within a stable interval associated with the gear position signal;

[0027] If the engine speed is outside the stable range, it is determined that the engine speed oscillates, and a mode enable signal and an oscillation suppression parameter are generated.

[0028] Preferably, when the oscillation judgment result includes the engine speed oscillating and the engine speed not oscillating, the mode control information includes the mode enabling information and the mode prohibiting information, and the excitation control information includes the oscillation suppression parameter and the mode normal flag, the oscillation suppression controller judges whether the engine speed oscillates according to the gear signal and the speed signal, and generates the mode control information and the excitation control information according to the oscillation judgment result, including:

[0029] The oscillation suppression controller determines whether the engine speed is within a stable interval associated with the gear position signal;

[0030] If the engine speed is outside the stable range, it is determined that the engine speed oscillates, and a mode enable signal and an oscillation suppression parameter are generated;

[0031] If the engine speed is within the stable range, it is determined that the engine speed does not oscillate, and at the same time, it is detected whether the gear position signal changes; if the gear position signal changes, a mode prohibition signal and a normal mode flag are generated.

[0032] Preferably, the stable interval associated with the gear signal is determined by the rated speed and the disturbance speed matched by the gear signal.

[0033] Preferably, the oscillation suppression parameter is determined by the oscillation range of the engine speed, and the corresponding relationship between the oscillation suppression parameter and the oscillation range of the engine speed is positively correlated.

[0034] As can be seen from the above, the oscillation suppression device, method and diesel-electric power system provided by the embodiment of the present invention are highly real-time by combining hard-wired signals (i.e., gear signals) and communication signals (i.e., speed signals), ensuring seamless switching between enabling and disabling oscillation suppression modes; at the same time, CAN communication is used to send excitation control information to the excitation controller, which simply and efficiently realizes dynamic power adjustment of the excitation system, thereby quickly suppressing the electromechanical oscillation of the entire diesel-electric power system. In addition, the device integrates acquisition, communication and logic functions, has complete functions, compact structure and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 This is a diagram of an application scenario of an oscillation suppression device for a diesel-electric power system in one embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of the structure of an oscillation suppression device for a diesel-electric power system in one embodiment of the present invention;

[0038] Figure 3 It is a schematic flow chart of an oscillation suppression method for a diesel-electric power system in one embodiment of the present invention;

[0039] Figure 4 1 is a flow chart of step S30 of the method for suppressing oscillation of a diesel-electric power system in one embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The oscillation suppression device for a diesel-electric power system provided by the embodiment of the present invention can be applied in Figure 1 In the application scenario, the input end of the oscillation suppression device of the diesel-electric power system is connected to the engine, and the output end is connected to the input end of the excitation controller; the output end of the excitation controller is connected to one end of the generator, and the control end is connected to the other end of the generator through the acquisition module and the voltage sensor in sequence. The oscillation suppression device of the diesel-electric power system is connected to the generator and the excitation controller through CAN communication.

[0042] like Figure 2 As shown, an oscillation suppression device for a diesel-electric power system provided by an embodiment of the present invention includes an oscillation suppression controller 1, and the oscillation suppression controller 1 includes a CAN communication module 11, a DI acquisition module 12, an oscillation decision module (LOC module) 14 and a DO drive module 13;

[0043] DI acquisition module 12, used to collect the gear position signal of the locomotive;

[0044] CAN communication module 11, used for receiving the speed signal sent by the engine;

[0045] An oscillation decision module (LOC module) 14 is used to determine whether the engine speed oscillates according to the gear position signal collected by the DI acquisition module 12 and the speed signal received by the CAN communication module 11, and to generate mode control information and excitation control information according to the oscillation determination result;

[0046] The DO driving module 13 is used to output the mode control information generated by the oscillation decision module 14 to control the oscillation suppression mode to be enabled or disabled;

[0047] The CAN communication module 11 is also used to send the suppression adjustment information generated by the oscillation decision module 14 to the excitation controller.

[0048] In this embodiment, the oscillation judgment results include two types: the engine speed oscillates and the engine speed does not oscillate; the mode control information includes two types: mode enable information and mode disable information, which are used to control the enablement or disablement of the oscillation suppression mode; the excitation control information includes two types: oscillation suppression parameters and mode normal identification, which are used to control whether the excitation current of the generator controlled by the excitation controller is regulated or not.

[0049] Specifically, the device collects the gear signal of the locomotive through the DI acquisition module (digital quantity acquisition module) 12, and when the gear signal is stable, receives the speed signal sent by the engine through the CAN communication module 11, and then uses the oscillation decision module 14 to comprehensively judge whether the engine speed oscillates according to the gear signal and the speed signal, and generates mode control information and excitation control information corresponding to the oscillation judgment result according to the oscillation judgment result, and finally outputs the mode control information through the DO drive module (digital quantity drive module) 13 to enable or disable the oscillation suppression mode of the entire device, and sends the excitation control information to the excitation controller through the CAN communication module 11 to adjust or not adjust the excitation current of the generator controlled by the excitation controller. It can be understood that when the oscillation suppression mode is enabled, the oscillation suppression parameter is sent to the excitation controller through the CAN communication module 11 to adjust the excitation current of the generator controlled by the excitation controller; and when the oscillation suppression mode is disabled, the mode normal flag is sent to the excitation controller through the CAN communication module 11 to not adjust the excitation current of the generator controlled by the excitation controller.

[0050] Preferably, the oscillation suppression controller 1 uses a high-speed digital signal processor (DSP) for digital signal DI acquisition and DO driving, and the DSP is internally integrated with a CAN communication module 11, a LOC module 14, a DC / DC converter 15, a DEBUG module 16, a universal asynchronous receiver-transmitter (UART) 17, etc. Among them, the CAN communication module 11 is used for the device to communicate with the engine and the excitation controller through CAN; the LOC module 14 is used to perform logical synthesis operations and determine whether to perform oscillation suppression and information transmission; the DC / DC converter 15 is used to effectively output a fixed voltage after converting the input voltage; the DEBUG module 16 is used to debug the device and eliminate program faults; the asynchronous receiver-transmitter 17 is used to communicate the data to be transmitted with the host computer (such as a personal computer, PC) in serial.

[0051] In other embodiments, the oscillation suppression controller 1 may also use other microprocessors, such as ARM, PowerPC, etc. In addition, the communication between the device and the engine and the excitation controller may also be carried out by Ethernet or other communication methods.

[0052] As can be seen from the above, the device of this embodiment combines the hard-wire signal (i.e., the gear signal) and the communication signal (i.e., the speed signal) with each other, with high real-time performance, ensuring seamless switching between enabling and disabling the oscillation suppression mode; at the same time, CAN communication is used to send excitation control information to the excitation controller, so as to simply and efficiently realize the dynamic power adjustment of the excitation system, thereby quickly suppressing the electromechanical oscillation of the entire diesel-electric power system; in addition, the device of this embodiment integrates acquisition, communication and logic functions, has complete functions, compact structure and is easy to install.

[0053] Furthermore, if Figure 2 As shown, the oscillation suppression controller 1 further includes a DC / DC converter 15 , and the oscillation suppression device of the diesel-electric power system further includes a power filter 2 and a cooling fan 3 connected to the DC / DC converter 15 .

[0054] In this embodiment, the device integrates a power filter 2 and a cooling fan 3, the input end of the power filter 2 is connected to an external power supply, and the output end is connected to a DC / DC converter 15 through a parallel cooling fan 3. It can be understood that the device of this embodiment improves the power supply quality of the oscillation suppression controller 1 through the integrated power filter 2, and in addition, the integrated cooling fan 3 enables the entire device to meet the heat dissipation requirements.

[0055] Preferably, the input end of the power filter 2 includes a positive input end and a negative input end, and the output end of the power filter 2 includes a positive output end and a negative output end; the cooling fan 3 is connected in parallel to the negative output end of the power filter 2.

[0056] Furthermore, if Figure 2 As shown, the oscillation suppression device of the diesel-electric power system further includes a power switch 4, one end of which is connected to the positive electrode U+ of the external power supply, and the other end is connected to the positive input terminal of the power filter 2. It can be understood that the device of this embodiment integrates the power switch 4, and the power switch 4 is used to control the on and off of the external power supply.

[0057] Further, the oscillation decision module 14 includes an oscillation judgment unit, a first decision output unit, and a second decision output unit;

[0058] an oscillation determination unit, for determining whether the engine speed is within a stable interval associated with the gear position signal;

[0059] A first decision unit, for determining that the engine speed oscillates if the engine speed is outside the stable range, and generating mode enabling information and oscillation suppression parameters;

[0060] The second decision unit is used to determine that the engine speed does not oscillate if the engine speed is within a stable range, and to generate a mode prohibition signal and a normal mode flag when a change in the gear position signal is detected.

[0061] In this embodiment, the stable interval associated with the gear signal is composed of the rated speed V that matches the gear signal. e and the disturbance speed V r To determine, the stable interval can be expressed as [V e -V r ,V e +V r]. Among them, the disturbance speed V r It is usually very small, ranging from a few turns to dozens of turns.

[0062] The oscillation suppression parameter is determined by the oscillation range of the engine speed, and the corresponding relationship between the oscillation suppression parameter and the oscillation range of the engine speed is positively correlated. That is, when the oscillation range of the engine speed is large, the oscillation suppression parameter is large, so that the excitation current of the generator is stable, thereby avoiding electromechanical oscillation caused by power oscillation; when the oscillation range of the engine speed is small, the oscillation suppression parameter is small, so that the excitation current of the generator responds quickly, thereby meeting the load power demand in time.

[0063] Specifically, the device determines whether the engine speed is in a stable range [V e -V r ,V e +V r ] If the engine speed is in the stable range [V e -V r ,V e +V r ], that is, the engine speed is less than V e -V r or greater than V e +V r , it is determined that the oscillation judgment result is that the engine speed oscillates, and the mode enabling information and oscillation suppression parameters are generated through the oscillation decision module 14. At this time, the device outputs the mode enabling information through the DO drive module 13, so that the oscillation suppression mode of the entire device is enabled, and the oscillation suppression parameters are sent to the excitation controller through the CAN communication module 11. Accordingly, the excitation controller will adjust the excitation current of the generator according to the oscillation suppression parameters, and quickly adjust the dynamic power of the excitation system until the oscillation phenomenon of the engine speed disappears.

[0064] If the engine speed is in the stable range [V e -V r ,V e +V r ], that is, the engine speed is greater than or equal to V e -V r , and is less than or equal to V e +V r, it is determined that the oscillation judgment result is that the engine speed does not oscillate. At this time, it is further determined whether the gear signal collected by the DI acquisition module 12 has changed. If the gear signal has not changed, the mode prohibition information and the mode normal mark are generated by the oscillation decision module 14. At this time, the device will output the mode prohibition information through the DO drive module 13, so that the oscillation suppression mode of the entire device is prohibited, and send the mode normal mark to the excitation controller through the CAN communication module 11. Accordingly, the excitation controller can control the generator normally without additionally adjusting the excitation current of the generator.

[0065] In one embodiment, an embodiment of the present invention also provides a diesel-electric power system, including an engine, an excitation controller, a generator, a collection module and a voltage sensor and an oscillation suppression device of any of the above embodiments, wherein the input end of the oscillation suppression device is connected to the engine, and the output end is connected to the excitation system.

[0066] In addition, if Figure 3 As shown, an oscillation suppression method for a diesel-electric power system provided by an embodiment of the present invention is applied to an oscillation suppression device for a diesel-electric power system in any of the above embodiments, and specifically comprises the following steps:

[0067] Step S10, the oscillation suppression controller 1 collects the gear position signal of the locomotive through the DI collection module 12;

[0068] Step S20, the oscillation suppression controller 1 receives the speed signal sent by the engine through the CAN communication module 11;

[0069] Step S30, the oscillation suppression controller 1 determines whether the engine speed oscillates according to the gear position signal and the speed signal, and generates mode control information and excitation control information according to the obtained oscillation determination result;

[0070] Step S40, the oscillation suppression controller 1 outputs mode control information through the DO driving module 13;

[0071] Step S50 : the oscillation suppression controller 1 sends excitation control information to the excitation controller through the CAN communication module 11 .

[0072] In this embodiment, the oscillation suppression controller 1 collects the gear signal of the locomotive through the DI acquisition module 12, and when the gear signal is stable, receives the speed signal sent by the engine through the CAN communication module 11, and then the oscillation decision module 14 comprehensively judges whether the engine speed oscillates according to the gear signal and the speed signal, and generates mode control information and excitation control information corresponding to the oscillation judgment result according to the oscillation judgment result, and finally outputs the mode control information through the DO drive module 13 to enable or disable the oscillation suppression mode, and sends the excitation control information to the excitation controller through the CAN communication module 11 to adjust or not adjust the excitation current of the generator controlled by the excitation controller. It can be understood that when the oscillation suppression mode is enabled, the oscillation suppression parameters are sent to the excitation controller through the CAN communication module 11 to adjust the excitation current of the generator controlled by the excitation controller; and when the oscillation suppression mode is disabled, the mode normal flag is sent to the excitation controller through the CAN communication module 11 to not adjust the excitation current of the generator controlled by the excitation controller.

[0073] As can be seen from the above, the electromechanical oscillation suppression method of the diesel-electric power system of this embodiment combines the hard-wired signal (i.e., the gear signal) and the communication signal (i.e., the speed signal) with each other, with high real-time performance, ensuring seamless switching between enabling and disabling the oscillation suppression mode; at the same time, CAN communication is used to send excitation control information to the excitation controller, which simply and efficiently realizes the dynamic power adjustment of the excitation system, thereby quickly suppressing the electromechanical oscillation of the entire diesel-electric power system.

[0074] In an alternative embodiment, if Figure 4 As shown, when the oscillation judgment result includes that the engine speed oscillates and the engine speed does not oscillate, the mode control information includes the mode enable information and the mode disable information, and the excitation control information includes the oscillation suppression parameter and the mode normal flag, step S30 specifically includes the following steps:

[0075] Step S301, the oscillation suppression controller 1 determines whether the engine speed is within a stable range associated with the gear position signal;

[0076] Step S302, if the engine speed is outside the stable range, it is determined that the engine speed oscillates, and a mode enable signal and an oscillation suppression parameter are generated;

[0077] Step S303, if the engine speed is within the stable range, it is determined that the engine speed does not oscillate, and at the same time, it is detected whether the gear position signal changes;

[0078] Step S304: if the gear position signal changes, a mode prohibition signal and a normal mode flag are generated; otherwise, whether the gear position signal changes is monitored in real time.

[0079] In this embodiment, the stable interval associated with the gear signal is composed of the rated speed V that matches the gear signal. e and the disturbance speed V r To determine, the stable interval can be expressed as [V e -V r ,V e +V r ]. Among them, the disturbance speed V r It is usually very small, ranging from a few turns to dozens of turns.

[0080] The oscillation suppression parameter is determined by the oscillation range of the engine speed, and the corresponding relationship between the oscillation suppression parameter and the oscillation range of the engine speed is positively correlated.

[0081] Specifically, the oscillation suppression controller 1 determines whether the engine speed is in a stable range [V e -V r ,V e +V r ] If the engine speed is in the stable range [V e -V r ,V e +V r ], that is, the engine speed is less than V e -V r or greater than V e +V r , it is determined that the oscillation judgment result is that the engine speed oscillates, and the mode enabling information and oscillation suppression parameters are generated through the oscillation decision module 14. At this time, the oscillation suppression controller 1 outputs the mode enabling information through the DO drive module 13, controls the oscillation suppression mode to be enabled, and sends the oscillation suppression parameters to the excitation controller through the CAN communication module 11. Accordingly, the excitation controller will adjust the excitation current of the generator according to the oscillation suppression parameters, and quickly adjust the dynamic power of the excitation system until the oscillation phenomenon of the engine speed disappears.

[0082] If the engine speed is in the stable range [V e -V r ,V e +V r ], that is, the engine speed is greater than or equal to V e -V r , and is less than or equal to V e +V r, it is determined that the oscillation judgment result is that the engine speed does not oscillate. At this time, it is further determined whether the gear signal collected by the DI acquisition module 12 has changed. If the gear signal has not changed, the mode prohibition information and the mode normal mark are generated by the oscillation decision module 14. At this time, the oscillation suppression controller 1 will output the mode prohibition information through the DO drive module 13 to control the oscillation suppression mode to be prohibited, and send the mode normal mark to the excitation controller through the CAN communication module 11. Accordingly, the excitation controller can control the generator normally without adjusting the excitation current of the generator.

[0083] It can be understood that the electromechanical oscillation suppression method of the diesel-electric power system of this embodiment determines whether the engine speed oscillates through the stable range associated with the gear signal, and monitors in real time whether the gear signal changes, thereby effectively ensuring seamless switching between enabling and disabling the oscillation suppression mode; in addition, by sending oscillation suppression parameters determined by the oscillation range of the engine speed to the excitation controller, dynamic power adjustment of the excitation system is achieved, thereby quickly suppressing the electromechanical oscillations of the entire diesel-electric power system.

[0084] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0085] The embodiments of the present invention are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the present invention.

Claims

1. An oscillation suppression device for a diesel-electric power system, characterized in that: It includes an oscillation suppression controller, which includes a CAN communication module, a DI acquisition module, an oscillation decision module and a DO drive module; The DI acquisition module is used to collect the gear position signal of the locomotive; The CAN communication module is used to receive the speed signal sent by the engine; The oscillation decision module is used to determine whether the engine speed oscillates according to the gear position signal collected by the DI acquisition module and the speed signal received by the CAN communication module, and generate mode control information and an oscillation control signal according to the oscillation determination result; The DO driving module is used to output the mode control information generated by the oscillation decision module to control the oscillation suppression mode to be enabled or disabled; The CAN communication module is also used to send the oscillation control signal generated by the oscillation decision module to the excitation controller; The oscillation judgment result includes whether the engine speed oscillates or not; the mode control information includes a mode enable signal and a mode disable signal; the oscillation control signal includes an oscillation suppression parameter and a normal mode identifier; The oscillation decision module includes an oscillation judgment unit, a first decision output unit, and a second decision output unit; The oscillation determination unit is used to determine whether the engine speed is within a stable interval associated with the gear position signal; The first decision unit is used to determine that the engine speed oscillates if the engine speed is outside the stable range, and to generate a mode enable signal and an oscillation suppression parameter; The second decision unit is used to determine that the engine speed does not oscillate if the engine speed is within a stable range, and to generate a mode prohibition signal and a normal mode flag when a change in the handle gear position signal is detected.

2. The oscillation suppression device for a diesel-electric power system according to claim 1, characterized in that: The oscillation suppression controller further includes a DC / DC converter, and the oscillation suppression device of the diesel-electric power system further includes a power filter and a cooling fan connected to the DC / DC converter.

3. The oscillation suppression device for a diesel-electric power system according to claim 2, characterized in that: The oscillation suppression controller further comprises a power switch, one end of which is connected to the positive electrode of the external power supply, and the other end of which is connected to the positive input end of the power filter.

4. A diesel-electric power system, comprising an engine, an excitation controller, a generator, a collection module and a voltage sensor, characterized in that: The diesel-electric power system also includes the oscillation suppression device as claimed in claim 1; the input end of the oscillation suppression device is connected to the engine, and the output end is connected to the excitation controller.

5. A method for suppressing oscillation of a diesel-electric power system, the method for suppressing oscillation of a diesel-electric power system being applied to the oscillation suppression device of a diesel-electric power system as claimed in claim 1, characterized in that: include: The oscillation suppression controller collects the gear position signal of the locomotive through the DI acquisition module; The oscillation suppression controller receives a speed signal sent by the engine through a CAN communication module; The oscillation suppression controller determines whether the engine speed oscillates according to the gear position signal and the speed signal, and generates mode control information and excitation control information according to the oscillation determination result; The oscillation suppression controller outputs the mode control information through a DO driving module; The oscillation suppression controller sends excitation control information to the excitation controller through the CAN communication module; The oscillation judgment result includes whether the engine speed oscillates or not; the mode control information includes mode enable information and mode disable information; the excitation control information includes an oscillation suppression parameter and a normal mode flag; The oscillation suppression controller determines whether the engine speed oscillates according to the gear position signal and the speed signal, and generates mode control information and excitation control information according to the oscillation determination result, including: The oscillation suppression controller determines whether the engine speed is within a stable interval associated with the gear position signal; If the engine speed is outside the stable range, it is determined that the engine speed is oscillating, and a mode enable signal and an oscillation suppression parameter are generated; If the engine speed is within the stable range, it is determined that the engine speed does not oscillate, and at the same time, it is detected whether the gear position signal changes; if the gear position signal changes, a mode prohibition signal and a normal mode flag are generated.

6. The oscillation suppression method of a diesel-electric power system according to claim 5, characterized in that: The stable interval associated with the gear signal is determined by the rated speed and the disturbance speed matched by the gear signal.

7. The oscillation suppression method of a diesel-electric power system according to claim 5, characterized in that: The oscillation suppression parameter is determined by the oscillation range of the engine speed, and the corresponding relationship between the oscillation suppression parameter and the oscillation range of the engine speed is positively correlated.

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