Voltage regulating circuit and voltage regulating method of generator controller for solving torsional resonance fault of generator in aviation power generation system

Abstract

The invention discloses a voltage regulating circuit and a voltage regulating method of a generator controller, which are used for solving a torsional resonance fault of a generator in an aviation power generation system, and the voltage regulating circuit comprises a voltage regulating sub-circuit and a feedback sub-circuit, a feedback sub-circuit is additionally arranged on the basis of a voltage regulating circuit of an original generator controller, after the negative end voltage F-of an exciting winding passes through the feedback sub-circuit, the output voltage of the feedback sub-circuit and the fixed voltage provided by a reference voltage circuit in the voltage regulating sub-circuit are synthesized to generate a regulating voltage, and the regulating voltage is connected to the in-phase end of a comparator; by comparing the adjusting voltage with the sensitive voltage in the comparator, a control voltage signal of which the duty ratio changes along with the output voltage of the generator is generated, and the control voltage signal is used for driving a power tube after passing through a driver, so that the negative end voltage F-of an excitation winding of the generator is changed, namely the excitation current characteristic of the generator is changed. According to the technical scheme, the problem of shaft breakage caused by torsional resonance in the power generation system is solved, and the problems that the risk is high, the difficulty is high, the development period of the power generation system can be prolonged and the like due to the fact that a shaft system structure of a generator needs to be changed in existing treatment measures for shaft breakage faults are solved.

Description

Technical Field

[0001] The present invention relates to, but is not limited to, the technical field of aviation power generation systems, and in particular to a voltage regulation circuit and a voltage regulation method of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system. Background Art

[0002] The current aviation power generation system is mainly composed of aircraft generators, generator controllers, etc., which work in conjunction with the engine transmission system to provide electrical energy that meets the power supply quality to the aircraft electrical load. During the operation of the power generation system, the mechanical force of the engine transmission system and the electromagnetic force of the power generation system may cause torsional resonance in the shaft system composed of the engine and the generator rotor, causing a broken shaft failure. The above torsional resonance phenomenon can be solved by changing the engine transmission system or improving the power generation system.

[0003] The current treatment measure is to improve the shaft structure of the generator in the power generation system, develop a new generator, and then re-develop and verify the generator and the power generation system, and finally deliver the power generation system. The above treatment measures involve changes to the shaft structure of the generator, which are high-risk and difficult, and will extend the development cycle of the power generation system, resulting in delays in delivery. Summary of the invention

[0004] Purpose of the present invention: In order to solve the above-mentioned technical problems, the embodiments of the present invention provide a voltage regulating circuit and a voltage regulating method of a generator controller for solving the torsional resonance failure of a generator in an aviation power generation system, so as to solve the problem of broken shaft caused by torsional resonance in the power generation system, and solve the existing treatment measures for broken shaft failure. Since it is necessary to change the shaft system structure of the generator, it leads to higher risks, greater difficulties, and prolongs the development cycle of the power generation system.

[0005] Technical solution of the present invention: In a first aspect, an embodiment of the present invention provides a voltage regulating circuit of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system, comprising: a voltage regulating subcircuit and a feedback subcircuit;

[0006] Wherein, the voltage regulating subcircuit comprises: a comparator, a driver and a power tube; the processed output voltage of the generator is divided to generate a sensitive voltage connected to the inverting end of the comparator, the output end of the comparator is connected to the control end of the power tube through the driver, the drain of the power tube is respectively connected to the anode of the freewheeling diode V5 and the negative voltage F- of the excitation winding, the source is connected to the negative end of the excitation power supply, and the cathode of the freewheeling diode V5 is respectively connected to the positive voltage F+ of the excitation winding and the positive end of the excitation power supply;

[0007] After the negative terminal voltage F- of the excitation winding passes through the feedback sub-circuit, the output voltage of the feedback sub-circuit and the fixed voltage provided by the reference voltage circuit inside the voltage regulation sub-circuit are combined to generate an adjustment voltage, which is connected to the non-inverting end of the comparator. By comparing the adjustment voltage with the sensitive voltage in the comparator, a control voltage signal whose duty cycle changes with the output voltage of the generator is generated. After passing through the driver, it is used to drive the power tube, thereby changing the negative terminal voltage F- of the excitation winding of the generator, that is, changing the excitation current characteristics of the generator.

[0008] Optionally, in the voltage regulating circuit of the generator controller for solving the torsional resonance fault of the generator in the aviation power generation system as described above, the feedback subcircuit includes: a resistor R11, a resistor R12, a capacitor C4, a rectifier diode V6 and a rectifier diode V7;

[0009] The negative terminal voltage F- of the excitation winding is respectively connected to one end of the resistor R11 and the anode of the rectifier diode V6, the other end of the resistor R11 is respectively connected to one end of the resistor R12 and the cathode of the rectifier diode V7, the cathode of the rectifier diode V6 is connected to the cathode of the rectifier diode V7, the other end of the resistor R12 and the anode of the rectifier diode V7 are respectively connected to one end of the capacitor C4, the other end of the capacitor C4 and the reference voltage circuit for providing a fixed voltage are respectively connected to the non-inverting end of the comparator.

[0010] Optionally, in the voltage regulating circuit of the generator controller for solving the torsional resonance fault of the generator in the aviation power generation system as described above,

[0011] By adjusting the parameter values ​​of the resistor R11, the resistor R12 and the capacitor C4 in the feedback subcircuit, the periodic variation of the excitation current in the generator at the rear end of the voltage regulation subcircuit is eliminated.

[0012] Optionally, in the voltage regulating circuit of the generator controller for solving the torsional resonance fault of the generator in the aviation power generation system as described above,

[0013] The feedback subcircuit after adjusting the parameter value is used to reflect the change amount of the negative terminal voltage F- of the excitation winding in the power generation system and its rate of change over time, so as to predict the change trend of the negative terminal voltage F- of the excitation winding.

[0014] Optionally, in the voltage regulating circuit of the generator controller for solving the torsional resonance fault of the generator in the aviation power generation system as described above,

[0015] The change amount and change rate of the voltage F- at the negative end of the excitation winding enter the voltage regulating subcircuit through the feedback subcircuit, changing the conduction ratio and period of the control voltage signal used to drive the power tube V4, thereby eliminating the periodic change of the voltage F- at the negative end of the excitation winding, making F- form a non-periodic change form, thereby achieving the purpose of non-periodic change of the excitation current, so that the electromagnetic torque also forms a non-periodic change, thereby reducing the influence of the electromagnetic torque on the transmission system and suppressing the occurrence of torsional resonance.

[0016] Optionally, in the voltage regulating circuit of the generator controller for solving the torsional resonance fault of the generator in the aviation power generation system as described above,

[0017] When the negative terminal voltage F- of the excitation winding of the power generation system has a tendency to change from low to high, the negative terminal voltage F- of the excitation winding, after passing through V6, R12 and C4 in the feedback sub-circuit, pulls down the adjustment voltage of the non-inverting terminal of the input comparator N2A, thereby reducing the conduction ratio of the control voltage signal used to drive V4 and showing no periodicity, quickly reducing the excitation current and eliminating the periodic change of the excitation current, so that the output voltage frequency range of the generator of the power generation system remains basically unchanged.

[0018] Optionally, in the voltage regulating circuit of the generator controller for solving the torsional resonance fault of the generator in the aviation power generation system as described above,

[0019] When the negative terminal voltage F- of the excitation winding of the power generation system has a tendency to change from high to low, the fixed voltage formed by the internal circuit passes through C4, V7, and R11 of the feedback sub-circuit. On the one hand, the fixed voltage quickly reverses to the negative terminal voltage F- of the excitation winding after passing through the feedback sub-circuit, so that the excitation current of the generator increases rapidly. On the other hand, the comparator non-phase terminal adjustment voltage increases, thereby increasing the conduction ratio of the control voltage signal used to drive V4 and showing no periodicity, rapidly increasing the excitation current and eliminating the periodic change of the excitation current, so that the output voltage frequency range of the generator of the power generation system remains basically unchanged.

[0020] In a second aspect, an embodiment of the present invention further provides a voltage regulation method of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system, wherein the voltage regulation method is performed on the output voltage of the generator using a voltage regulation circuit as described in any one of the above items, comprising:

[0021] By adjusting the parameter values ​​of the resistor R11, the resistor R12 and the capacitor C4 in the feedback subcircuit in the experiment, the periodic change of the excitation current in the generator at the rear end of the voltage regulation subcircuit is eliminated; and the feedback subcircuit after the parameter value is adjusted is used to reflect the change amount of the negative terminal voltage F- of the excitation winding in the power generation system and its rate of change over time, so as to predict the change trend of the negative terminal voltage F- of the excitation winding.

[0022] Optionally, in the voltage regulation method of the generator controller for solving the torsional resonance fault of the generator in the aviation power generation system as described above, for the feedback subcircuit with adjusted parameter value,

[0023] The change amount and change rate of the voltage F- at the negative end of the excitation winding enter the voltage regulation subcircuit through the feedback subcircuit, changing the conduction ratio and period of the control voltage signal used to drive the power tube V4, thereby eliminating the periodic change of the voltage F- at the negative end of the excitation winding, making F- form a non-periodic change form, thereby achieving the purpose of non-periodic change of the excitation current, so that the electromagnetic torque also forms a non-periodic change, thereby reducing the adverse effect of the electromagnetic torque on the transmission system and suppressing the occurrence of torsional resonance.

[0024] Beneficial effects of the present invention: A voltage regulating circuit and voltage regulating method of a generator controller for solving the torsional resonance fault of a generator in an aviation power generation system provided by an embodiment of the present invention introduces a feedback subcircuit into the original voltage regulating circuit; after the negative terminal voltage F- of the excitation winding passes through the feedback subcircuit, the output voltage of the feedback subcircuit and the fixed voltage provided by the reference voltage circuit inside the voltage regulating subcircuit are integrated to generate an adjustment voltage, which is connected to the in-phase terminal of the comparator, and the adjustment voltage is compared with the sensitive voltage in the comparator to generate a control voltage signal whose duty cycle changes with the output voltage of the generator, which is used to drive the power tube after the driver, thereby changing the negative terminal voltage F- of the excitation winding of the generator, that is, changing the excitation current characteristics of the generator. It can be seen that the technical solution provided by the present invention can eliminate the periodic change of the excitation current of the generator, eliminate the periodic change of the electromagnetic torque, suppress the adverse effect of the electromagnetic torque on the generator bearing, and avoid the occurrence of the broken shaft fault caused by torsional resonance, effectively ensure the reliable power generation of the power generation system, and improve the power supply safety of the aviation power supply system, and has a strong engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0026] Figure 1 It is a circuit structure diagram of a voltage regulating circuit in an existing generator controller;

[0027] Figure 2 A schematic diagram of the circuit structure of a voltage regulating circuit of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system provided by an embodiment of the present invention;

[0028] Figure 3 To adopt Figure 1 The test waveform diagram of the voltage regulating circuit of the generator controller shown;

[0029] Figure 4 To adopt Figure 2 A schematic diagram of a test waveform 1 of a voltage regulating circuit of a generator controller shown; Figure 4 To adopt Figure 2 The improved generator controller shown is tested with waveform 1 at rated speed of 4060r / min and load of 100A;

[0030] Figure 5 To adopt Figure 2 A schematic diagram of a test waveform 2 of a voltage regulating circuit of a generator controller shown; Figure 5 To adopt Figure 2 The improved generator controller shown is tested with waveform 2 at a rated speed of 4060r / min and a load of 100A. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0032] As explained in the above background technology, during the operation of the power generation system, the mechanical force of the engine transmission system and the electromagnetic force of the power generation system may cause torsional resonance in the shaft system composed of the engine and the generator rotor, causing a broken shaft failure. However, the existing treatment measures for the broken shaft failure require changing the shaft system structure of the generator, which leads to higher risks and difficulties, and prolongs the development cycle of the power generation system.

[0033] In order to solve the above problems, the designers of the present invention analyzed and found that the torsional resonance of the generator is the result of the interaction between the mechanical force of the engine transmission system and the electromagnetic force of the power generation system. The electromagnetic torque of the generator in the power generation system is positively correlated with the excitation current. From the perspective of the generator controller, if the excitation current changes periodically, the electromagnetic torque generated will also change periodically, thereby affecting the bearings of the generator and causing torsional resonance. Based on the above analysis, if the excitation current can eliminate the periodic changes, the electromagnetic torque generated can also eliminate the periodic changes, thereby reducing the adverse effects of the electromagnetic torque on the generator bearings and solving the torsional resonance failure phenomenon.

[0034] Based on the above design analysis, an embodiment of the present invention provides a voltage regulating circuit and a voltage regulating method of a generator controller for solving the torsional resonance failure of a generator in an aviation power generation system. By improving and optimizing the voltage regulating circuit in the generator controller, the periodic variation of the excitation current is eliminated, the electromagnetic torque of the power generation system is optimized, the periodic variation of the electromagnetic torque is eliminated, the torsional resonance phenomenon is suppressed and avoided, and the stability of the operation of the generator in the aviation power generation system and the power supply safety are improved.

[0035] The present invention provides the following specific embodiments which can be combined with each other. The same or similar concepts or processes may not be described in detail in some embodiments.

[0036] The electromagnetic torque of the power generation system is closely related to the excitation current, and the control of the excitation current is related to the voltage regulation circuit and parameters of the generator controller, such as Figure 1 As shown, it is a circuit structure schematic diagram of the voltage regulating circuit in the existing generator controller.

[0037] Figure 1 The working principle of the voltage regulating circuit shown is: the voltage regulating circuit applies the processed generator output voltage to the inverting terminal of the comparator after passing through the voltage divider circuit, and compares it with the fixed voltage generated by the reference voltage circuit inside the voltage regulating circuit and connected to the non-phase terminal of the comparator, and generates a control voltage signal whose duty cycle changes with the generator output voltage. The control voltage signal drives the power tube V4 after passing through the driver, thereby changing the excitation current characteristics of the generator.

[0038] It should be noted that in this voltage regulating circuit, when the generator output voltage increases, the duty cycle of the generated control voltage signal decreases, the excitation current decreases, and the generator output voltage decreases; when the generator output voltage decreases, the duty cycle of the generated control voltage signal increases, the excitation current increases, and the generator output voltage increases.

[0039] According to the experience of developing various power generation systems, when the excitation current of the generator changes periodically, the output frequency of the generator will also show obvious periodic jumps, and the electromagnetic torque will also change periodically, which will significantly enhance the impact on the generator bearings. Therefore, in order to suppress the impact of the electromagnetic torque on the generator bearings, it is necessary to eliminate the periodic changes of the excitation current and electromagnetic torque as much as possible.

[0040] Figure 2 The present invention provides a circuit structure diagram of a voltage regulating circuit of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system. Figure 2 As shown, the main circuit structure of the voltage regulating circuit of the generator controller for solving the torsional resonance fault of the generator in the aviation power generation system provided by the embodiment of the present invention includes: a voltage regulating subcircuit and a feedback subcircuit.

[0041] like Figure 2As shown, the voltage regulating subcircuit in the embodiment of the present invention includes: a comparator, a driver and a power tube; the processed output voltage of the generator is divided to generate a sensitive voltage connected to the inverting end of the comparator, the output end of the comparator is connected to the control end of the power tube through the driver, the drain of the power tube is respectively connected to the anode of the freewheeling diode V5 and the negative terminal voltage F- of the excitation winding, the source is connected to the negative terminal of the excitation power supply, and the cathode of the freewheeling diode V5 is respectively connected to the positive terminal voltage F+ of the excitation winding and the positive terminal of the excitation power supply.

[0042] In the embodiment of the present invention, after the negative terminal voltage F- of the excitation winding passes through the feedback sub-circuit, the output voltage of the feedback sub-circuit and the fixed voltage provided by the reference voltage circuit inside the voltage regulation sub-circuit are integrated to generate an adjustment voltage, which is connected to the non-inverting terminal of the comparator. By comparing the adjustment voltage with the sensitive voltage in the comparator, a control voltage signal whose duty cycle changes with the output voltage of the generator is generated. After passing through the driver, it is used to drive the power tube, thereby changing the negative terminal voltage F- of the excitation winding of the generator, that is, changing the excitation current characteristics of the generator.

[0043] In one implementation of the embodiment of the present invention, the improved voltage regulating circuit proposed by the present invention is used to eliminate the periodic variation of the excitation current, such as Figure 2 As shown, a feedback subcircuit is introduced into the original voltage regulating circuit. The feedback subcircuit includes: a resistor R11, a resistor R12, a capacitor C4, a rectifier diode V6 and a rectifier diode V7.

[0044] In this implementation, the negative terminal voltage F- of the excitation winding is respectively connected to one end of the resistor R11 and the anode of the rectifier diode V6, the other end of the resistor R11 is respectively connected to one end of the resistor R12 and the cathode of the rectifier diode V7, the cathode of the rectifier diode V6 is connected to the cathode of the rectifier diode V7, the other end of the resistor R12 and the anode of the rectifier diode V7 are respectively connected to one end of the capacitor C4, and the other end of the capacitor C4 and a reference voltage circuit for providing a fixed voltage are respectively connected to the non-inverting end of the comparator.

[0045] Based on the circuit structure of the feedback subcircuit in the implementation, by adjusting the parameter values ​​of the resistor R11, the resistor R12 and the capacitor C4 in the feedback subcircuit, the periodic change of the excitation current in the generator at the rear end of the voltage regulation subcircuit can be eliminated. The feedback subcircuit after adjusting the parameter value can reflect the change amount of the negative terminal voltage F- of the excitation winding in the power generation system and its rate of change over time, thereby predicting the change trend of the negative terminal voltage F- of the excitation winding.

[0046] Figure 2In the voltage regulating circuit shown, the feedback subcircuit can reflect the change amount of the voltage F- at the negative end of the excitation winding in the power generation system and its change rate over time, and predict the change trend of the voltage F- at the negative end of the excitation winding, so that it can produce an advanced control effect. The rectifier diode V6 and the rectifier diode V7 can effectively prevent jitter and improve the circuit stability. By adjusting the parameter values ​​of the resistors R11, R12 and the capacitor C4, the periodic change of the excitation current is eliminated. Specifically, the change amount and change rate of the voltage F- at the negative end of the excitation winding enter the voltage regulating subcircuit through the feedback subcircuit, and the conduction ratio and period of the control voltage signal used to drive the power tube V4 are changed, thereby eliminating the periodic change of the voltage F- at the negative end of the excitation winding, so that F- forms a non-periodic change form, thereby achieving the purpose of non-periodic change of the excitation current, so that the electromagnetic torque also forms a non-periodic change. Since the non-periodic change of the electromagnetic torque can avoid the torsional resonance phenomenon between the generator rotor and the transmission system bearing, the influence of the electromagnetic torque on the transmission system is reduced, and the occurrence of torsional resonance is suppressed.

[0047] The specific implementation method of suppressing torsional resonance is:

[0048] Through the integration of the voltage regulation subcircuit and the feedback subcircuit, according to the characteristics of the power generation system, the parameter values ​​of the resistor R11, the resistor R12 and the capacitor C4 in the feedback subcircuit are continuously adjusted through experiments until the parameter values ​​that can eliminate the periodic changes of the excitation current are found.

[0049] When the negative terminal voltage F- of the excitation winding of the power generation system has a tendency to change from low to high, the negative terminal voltage F- of the excitation winding, after passing through V6, R12 and C4 in the feedback sub-circuit, pulls down the adjustment voltage of the non-inverting terminal of the input comparator N2A, thereby reducing the conduction ratio of the control voltage signal used to drive V4 and showing no periodicity, quickly reducing the excitation current and eliminating the periodic change of the excitation current, so that the output voltage frequency range of the generator of the power generation system remains basically unchanged.

[0050] When the negative terminal voltage F- of the excitation winding of the power generation system has a tendency to change from high to low, the fixed voltage formed by the internal circuit passes through C4, V7, and R11 of the feedback sub-circuit. On the one hand, the fixed voltage quickly reverses to the negative terminal voltage F- of the excitation winding after passing through the feedback sub-circuit, so that the excitation current of the generator increases rapidly. On the other hand, the comparator non-phase terminal adjustment voltage increases, thereby increasing the conduction ratio of the control voltage signal used to drive V4 and showing no periodicity, rapidly increasing the excitation current and eliminating the periodic change of the excitation current, so that the output voltage frequency range of the generator of the power generation system remains basically unchanged.

[0051] Based on the voltage regulating circuit of the generator controller for solving the torsional resonance fault of the generator in the aviation power generation system provided by the above embodiments of the present invention, the embodiment of the present invention further provides a voltage regulating method of the generator controller for solving the torsional resonance fault of the generator in the aviation power generation system, specifically using the voltage regulating circuit provided by any one of the above embodiments to perform a voltage regulating method on the output voltage of the generator, the voltage regulating method comprising:

[0052] By adjusting the parameter values ​​of the resistor R11, the resistor R12 and the capacitor C4 in the feedback subcircuit in the experiment, the periodic change of the excitation current in the generator at the rear end of the voltage regulation subcircuit is eliminated; and the feedback subcircuit after the parameter value is adjusted is used to reflect the change amount of the negative terminal voltage F- of the excitation winding in the power generation system and its rate of change over time, so as to predict the change trend of the negative terminal voltage F- of the excitation winding.

[0053] The feedback subcircuit with adjusted parameter values ​​is obtained through the above steps. The change amount and change rate of the negative terminal voltage F- of the excitation winding enter the voltage regulation subcircuit through the feedback subcircuit, and the conduction ratio and period of the control voltage signal used to drive the power tube V4 are changed, thereby eliminating the periodic change of the negative terminal voltage F- of the excitation winding, so that F- forms a non-periodic change form, thereby achieving the purpose of non-periodic change of the excitation current, so that the electromagnetic torque also forms a non-periodic change, thereby reducing the adverse effect of the electromagnetic torque on the transmission system and suppressing the occurrence of torsional resonance.

[0054] The embodiment of the present invention provides a voltage regulating circuit and a voltage regulating method of a generator controller for solving the torsional resonance fault of a generator in an aviation power generation system. A feedback subcircuit is introduced into the original voltage regulating circuit; after the negative terminal voltage F- of the excitation winding passes through the feedback subcircuit, the output voltage of the feedback subcircuit and the fixed voltage provided by the reference voltage circuit inside the voltage regulating subcircuit are integrated to generate an adjustment voltage, which is connected to the in-phase terminal of the comparator. By comparing the adjustment voltage with the sensitive voltage in the comparator, a control voltage signal whose duty cycle changes with the output voltage of the generator is generated, which is used to drive the power tube after passing through the driver, thereby changing the negative terminal voltage F- of the excitation winding of the generator, that is, changing the excitation current characteristics of the generator. It can be seen that the technical solution provided by the present invention can eliminate the periodic change of the excitation current of the generator, eliminate the periodic change of the electromagnetic torque, suppress the adverse effect of the electromagnetic torque on the generator bearing, and avoid the occurrence of the broken shaft fault caused by torsional resonance, effectively ensure the reliable power generation of the power generation system, and improve the power supply safety of the aviation power supply system, and has a strong engineering application value.

[0055] The following is a schematic illustration of an implementation example of a voltage regulating circuit and a voltage regulating method of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system provided by an embodiment of the present invention.

[0056] In order to avoid the problem of generator torsional resonance caused by the periodic change of generator excitation current in the power generation system, this implementation case is based on Figure 1 , Figure 2 The circuit schematic diagram and parameter value configuration method of the voltage regulating circuit shown in the figure are designed to effectively eliminate the periodic changes in the generator excitation current, eliminate the periodic changes in the electromagnetic torque, suppress the adverse effects of the electromagnetic torque on the generator bearings and avoid the occurrence of broken shaft failures caused by torsional resonance, effectively ensure the reliable power generation of the power generation system, and improve the power supply safety of the aviation power supply system. It has a strong engineering application value.

[0057] The present invention will be further described below in conjunction with the accompanying drawings:

[0058] Taking a certain type of power generation system as an example, during the test flight, the power generation system reported a "no voltage output" alarm while the aircraft was continuously powered on. The fault phenomenon still existed after reset. The generator elastic shaft was found to be broken on the aircraft. It was confirmed that the cause of the generator shaft breakage failure was torsional resonance in the shaft system composed of the engine transmission system and the power generation system. The original generator controller was used to match the generator to conduct an on-board operating test of the power generation system, that is, the test was conducted under the conditions of a rated speed of 4060r / min and a load of 100A. Figure 3 As shown, the Figure 1 The test waveform diagram of the voltage regulating circuit of the generator controller is shown. Figure 3 To adopt Figure 1 The generator controller shown is tested at a rated speed of 4060r / min and a load of 100A.

[0059] from Figure 3 It can be seen that the excitation current value changes periodically in the range of 2.44A to 5.72A, with a frequency of about 25Hz, and the generator output frequency fluctuates in the range of 390Hz to 422Hz, with a variation of ±16Hz.

[0060] The voltage regulating circuit of the generator controller for solving the torsional resonance fault of the generator in the aviation power generation system provided by the above embodiment of the present invention is adopted, that is, Figure 1 A feedback subcircuit is newly added in the voltage regulating circuit of the generator controller shown. According to the characteristics of the power generation system, the parameter values ​​of the resistor R11, the resistor R12, and the capacitor C4 in the feedback subcircuit are continuously adjusted through experiments.

[0061] Use the improved voltage regulation circuit and configure the relevant parameters as C4=0.33μF, R11=80kΩ, R12=20kΩ, and conduct the test under the conditions of rated speed 4060r / min and rated load 100A. Figure 4 As shown, the Figure 2 Schematic diagram of test waveform 1 of the voltage regulating circuit of the generator controller shown. Figure 4To adopt Figure 2 The improved generator controller shown is tested with waveform 1 at a rated speed of 4060r / min and a load of 100A.

[0062] from Figure 4 It can be seen that the excitation current varies in the range of 3.16A to 4.94A, the amplitude decreases, and the generator output frequency fluctuates in the range of 404Hz to 408Hz, with a variation of ±2Hz. Compared with the existing voltage regulation circuit, the fluctuation range of the generator output frequency is significantly reduced.

[0063] Use the improved voltage regulation circuit and configure the relevant parameters as C4=0.33μF, R11=41.7kΩ, R12=20kΩ, and conduct the test under the conditions of rated speed 4060r / min and rated load 100A. Figure 5 As shown, the Figure 2 Schematic diagram of test waveform 2 of the voltage regulating circuit of the generator controller shown. Figure 5 To adopt Figure 2 The improved generator controller shown is tested with waveform 2 at a rated speed of 4060r / min and a load of 100A.

[0064] from Figure 5 It can be seen that the excitation current varies in the range of 3.29A to 5.02A without periodic fluctuations, and the generator output frequency fluctuates in the range of 405.7Hz to 406.2Hz, with a variation of ±0.25Hz, which is significantly reduced compared with the existing voltage regulation circuit.

[0065] Through the implementation cases of the present invention, it can be obtained that by adjusting the parameter values ​​in the feedback subcircuit, the periodic change of the excitation current is eliminated, thereby eliminating the periodic change of the electromagnetic torque, reducing the adverse effect of the electromagnetic torque on the generator bearing, and suppressing the occurrence of torsional resonance. The improved generator controller has undergone acceptance tests, engine test tests and various environmental tests. The test results meet the system use requirements. This application can effectively solve the problem of torsional resonance of the generator.

[0066] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A voltage regulating circuit of a generator controller for solving a generator torsional resonance fault in an aviation power generation system, characterized in that: include: Voltage regulation subcircuit and feedback subcircuit; Wherein, the voltage regulating subcircuit comprises: a comparator, a driver and a power tube; the processed output voltage of the generator is divided to generate a sensitive voltage connected to the inverting end of the comparator, the output end of the comparator is connected to the control end of the power tube through the driver, the drain of the power tube is respectively connected to the anode of the freewheeling diode V5 and the negative voltage F- of the excitation winding, the source is connected to the negative end of the excitation power supply, and the cathode of the freewheeling diode V5 is respectively connected to the positive voltage F+ of the excitation winding and the positive end of the excitation power supply; After the negative terminal voltage F- of the excitation winding passes through the feedback sub-circuit, the output voltage of the feedback sub-circuit and the fixed voltage provided by the reference voltage circuit inside the voltage regulation sub-circuit are combined to generate an adjustment voltage, which is connected to the non-inverting end of the comparator. By comparing the adjustment voltage with the sensitive voltage in the comparator, a control voltage signal whose duty cycle changes with the output voltage of the generator is generated. After passing through the driver, it is used to drive the power tube, thereby changing the negative terminal voltage F- of the excitation winding of the generator, that is, changing the excitation current characteristics of the generator.

2. The voltage regulating circuit of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system according to claim 1, characterized in that: The feedback subcircuit includes: a resistor R11, a resistor R12, a capacitor C4, a rectifier diode V6 and a rectifier diode V7; The negative terminal voltage F- of the excitation winding is respectively connected to one end of the resistor R11 and the anode of the rectifier diode V6, the other end of the resistor R11 is respectively connected to one end of the resistor R12 and the cathode of the rectifier diode V7, the cathode of the rectifier diode V6 is connected to the cathode of the rectifier diode V7, the other end of the resistor R12 and the anode of the rectifier diode V7 are respectively connected to one end of the capacitor C4, the other end of the capacitor C4 and the reference voltage circuit for providing a fixed voltage are respectively connected to the non-inverting end of the comparator.

3. The voltage regulating circuit of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system according to claim 2, characterized in that: By adjusting the parameter values ​​of the resistor R11, the resistor R12 and the capacitor C4 in the feedback subcircuit, the periodic variation of the excitation current in the generator at the rear end of the voltage regulation subcircuit is eliminated.

4. The voltage regulating circuit of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system according to claim 3, characterized in that: The feedback subcircuit after adjusting the parameter value is used to reflect the change amount of the negative terminal voltage F- of the excitation winding in the power generation system and its rate of change over time, so as to predict the change trend of the negative terminal voltage F- of the excitation winding.

5. The voltage regulating circuit of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system according to claim 4, characterized in that: The change amount and change rate of the voltage F- at the negative end of the excitation winding enter the voltage regulating subcircuit through the feedback subcircuit, changing the conduction ratio and period of the control voltage signal used to drive the power tube V4, thereby eliminating the periodic change of the voltage F- at the negative end of the excitation winding, making F- form a non-periodic change form, thereby achieving the purpose of non-periodic change of the excitation current, so that the electromagnetic torque also forms a non-periodic change, thereby reducing the influence of the electromagnetic torque on the transmission system and suppressing the occurrence of torsional resonance.

6. The voltage regulating circuit of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system according to claim 5, characterized in that: When the negative terminal voltage F- of the excitation winding of the power generation system has a tendency to change from low to high, the negative terminal voltage F- of the excitation winding, after passing through V6, R12 and C4 in the feedback sub-circuit, pulls down the adjustment voltage of the non-inverting terminal of the input comparator N2A, thereby reducing the conduction ratio of the control voltage signal used to drive V4 and showing no periodicity, quickly reducing the excitation current and eliminating the periodic change of the excitation current, so that the output voltage frequency range of the generator of the power generation system remains basically unchanged.

7. The voltage regulating circuit of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system according to claim 5, characterized in that: When the negative terminal voltage F- of the excitation winding of the power generation system has a tendency to change from high to low, the fixed voltage formed by the internal circuit passes through C4, V7, and R11 of the feedback sub-circuit. On the one hand, the fixed voltage quickly reverses to the negative terminal voltage F- of the excitation winding after passing through the feedback sub-circuit, so that the excitation current of the generator increases rapidly. On the other hand, the comparator non-phase terminal adjustment voltage increases, thereby increasing the conduction ratio of the control voltage signal used to drive V4 and showing no periodicity, rapidly increasing the excitation current and eliminating the periodic change of the excitation current, so that the output voltage frequency range of the generator of the power generation system remains basically unchanged.

8. A voltage regulation method of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system, characterized in that: A method for regulating the output voltage of a generator by using the voltage regulating circuit according to any one of claims 2 to 7 comprises: By adjusting the parameter values ​​of the resistor R11, the resistor R12 and the capacitor C4 in the feedback subcircuit in the experiment, the periodic change of the excitation current in the generator at the rear end of the voltage regulation subcircuit is eliminated; and the feedback subcircuit after the parameter value is adjusted is used to reflect the change amount of the negative terminal voltage F- of the excitation winding in the power generation system and its rate of change over time, so as to predict the change trend of the negative terminal voltage F- of the excitation winding.

9. The voltage regulation method of a generator controller for solving a torsional resonance fault of a generator in an aviation power generation system according to claim 8, characterized in that: For the feedback subcircuit with adjusted parameter values, The change amount and change rate of the voltage F- at the negative end of the excitation winding enter the voltage regulation subcircuit through the feedback subcircuit, changing the conduction ratio and period of the control voltage signal used to drive the power tube V4, thereby eliminating the periodic change of the voltage F- at the negative end of the excitation winding, making F- form a non-periodic change form, thereby achieving the purpose of non-periodic change of the excitation current, so that the electromagnetic torque also forms a non-periodic change, thereby reducing the adverse effect of the electromagnetic torque on the transmission system and suppressing the occurrence of torsional resonance.

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