CN-116131684-B - Generator controller of constant-frequency alternating-current power supply system and control method thereof

CN116131684BCN 116131684 BCN116131684 BCN 116131684BCN-116131684-B

Abstract

The application provides a control method of a generator controller of a constant-frequency alternating-current power supply system, which is used for solving the clapping problem caused by weak loading capacity of constant-loading of the constant-frequency alternating-current power supply system at low rotating speed, and comprises the steps of periodically acquiring exciting voltage, frequency and generator control switch signals, main contactor signals and three-phase current of a generator obtained through a transformer; when the exciting voltage and frequency of the generator are less than a preset value, the generator control switch signal and the main contactor signal are switched on, and any current in the three-phase transformer current is less than the preset electricity, a chopping mark is generated, and the voltage regulator is controlled to inhibit working according to the chopping mark, so that the exciting current in the exciting loop of the generator is subjected to chopping treatment to adjust the duty ratio of the exciting current, thereby reducing the three-phase alternating current output voltage of the generator, reducing the load power, improving the frequency of the generator, and enabling the constant-frequency alternating current power supply system to enter under-frequency protection so as to solve the problem of beating of the main contactor.

Inventors

LI HAICHAO
HAN SHURAN
YAN XINJUN

Assignees

陕西航空电气有限责任公司

Dates

Publication Date: 20260505
Application Date: 20221214

Claims (7)

1. The utility model provides a generator controller control method of constant frequency alternating current power supply system for solve the constant frequency alternating current power supply system and constantly adorn the clapping problem that the carrying capacity is weak arouses at low rotational speed, its characterized in that, the method includes: Periodically acquiring exciting voltage, frequency and generator control switch signals of a generator, signals of a main contactor and three-phase current of the generator obtained through a transformer; When the excitation voltage of the generator is judged to be smaller than a preset voltage value and the frequency is judged to be smaller than a preset frequency value, the generator control switch signal and the main contactor signal are both switched on, and any current in the three-phase transformer current is judged to be smaller than a preset current value, a chopping mark is generated; And controlling a voltage regulator of a generator controller to inhibit working according to the chopping identification, so that exciting current in an exciting loop of the generator is subjected to a chopping process to adjust the duty ratio of the exciting current, thereby reducing the three-phase alternating current output voltage of the generator, reducing the load power of a constant frequency alternating current power supply system, improving the frequency of the generator to be more than 330Hz of a strong underfrequency fault point, and enabling the constant frequency alternating current power supply system to enter underfrequency protection so as to solve the problem of shooting of a main contactor.
2. The method according to claim 1, wherein in the process of chopping the exciting current in the exciting circuit of the generator, when the chopping mark exists, and the exciting voltage of the generator is judged to be smaller than a predetermined voltage value and the frequency is judged to be smaller than a predetermined frequency value, and simultaneously, the generator control switch signal and the main contactor signal are judged to be on, and when any one of the three-phase transformer currents is judged to be smaller than the predetermined current value, the chopping mark count is incremented.
3. The method of controlling a generator controller of a constant frequency ac power system according to claim 2, wherein the fail-safe flag is generated when the chopping duration is greater than a predetermined time and the chopping flag count reaches a predetermined count value.
4. The method of claim 3, wherein the generator controller controls the main contactor and the electromagnetic relay of the generator to be turned off to de-energize the generator, and/or based on the fail-safe flag And according to the fault protection identifier, the generator controller controls a generator control switch to be disconnected so as to reset the constant-frequency alternating-current power supply system.
5. The method of claim 2, wherein when the chopping duration is greater than a predetermined time and the chopping count does not reach the predetermined count value, resetting the chopping duration and the chopping count and clearing the chopping flag.
6. The method of claim 2, wherein when the chopping count is equal to a product of the upper period chopping count and the duty cycle of the exciting current, if the exciting voltage of the generator is less than a predetermined voltage value and the frequency is less than a predetermined frequency value, and the generator control switch and the main contactor are turned on, and when any one of the three-phase transformer currents is greater than a predetermined current value, the voltage regulator of the generator controller is restored.
7. A generator controller of a constant frequency ac power supply system, characterized in that the generator controller comprises a voltage regulator, and the generator controller controls the operating state of the voltage regulator according to the generator controller control method of the constant frequency ac power supply system as claimed in any one of claims 1 to 6.

Description

Generator controller of constant-frequency alternating-current power supply system and control method thereof Technical Field The application belongs to the technical field of generator controllers, and particularly relates to a generator controller of a constant-frequency alternating-current power supply system and a control method thereof. Background With the increasing demands of aviation power supply systems and the increasing complexity of control modes, the control modes of the power supply systems are also developed from the earliest analog circuit controllers to the existing digital controllers, and the design of the digital controllers plays a decisive role in realizing the functions of the whole power supply system. A constant-frequency alternating current power generation system (or constant-frequency alternating current power supply system) is formed by a certain type of generator controller, a certain type of oil-cooled alternating current generator, a current transformer and other finished products, and the constant-frequency alternating current power generation system provides 115/200V and 400Hz constant-frequency alternating current meeting GJB181-86 requirements for electric equipment on an aircraft. The generator controller is used for automatically adjusting the voltage of the regulating point, and enables the generator to generate three-phase alternating current meeting the regulation through adjusting exciting current, and meanwhile, the generator controller has the functions of control, protection, self-detection, fault isolation, communication and the like. When the generator of the constant frequency alternating current power generation system is at a low rotation speed (less than 9000 rpm/min) to generate power, the load of the electric equipment on the machine is suddenly increased to 25kVA-30kVA, the frequency of the generator is reduced to be below a strong underfrequency point (330 Hz), strong underfrequency fault protection is executed at the moment, the generator controller detects strong underfrequency protection and disconnects the feeder main contactor and the excitation relay, the sudden load is removed at the moment, the generator frequency is restored to be in a normal range, the generator controller is connected with the excitation relay and the feeder main contactor, the load of the electric equipment is suddenly increased to 25kVA-30kVA again, and the feeder main contactor is caused to clap. The generator controller in the prior art has no corresponding control and protection strategy for the clapping problem caused by weak constant loading and carrying capacity of the constant frequency alternating current power supply system at low rotation speed. Disclosure of Invention The application aims to provide a generator controller of a constant-frequency alternating current power supply system and a control method thereof, which are used for solving or alleviating at least one problem in the background technology. The technical scheme of the application is that a control method of a generator controller of a constant-frequency alternating-current power supply system is used for solving the clapping problem caused by weak constant loading and carrying capacity of the constant-frequency alternating-current power supply system at a low rotating speed, and is characterized by comprising the following steps: Periodically acquiring exciting voltage, frequency and generator control switch signals of a generator, signals of a main contactor and three-phase current of the generator obtained through a transformer; When the excitation voltage of the generator is judged to be smaller than a preset voltage value and the frequency is judged to be smaller than a preset frequency value, the generator control switch signal and the main contactor signal are both switched on, and any current in the three-phase transformer current is judged to be smaller than a preset current value, a chopping mark is generated; And controlling a voltage regulator of a generator controller to inhibit working according to the chopping identification, so that exciting current in an exciting loop of the generator is subjected to a chopping process to adjust the duty ratio of the exciting current, thereby reducing the three-phase alternating current output voltage of the generator, reducing the load power of a constant frequency alternating current power supply system, improving the frequency of the generator to be more than 330Hz of a strong underfrequency fault point, and enabling the constant frequency alternating current power supply system to enter underfrequency protection so as to solve the problem of shooting of a main contactor. Further, in the process of chopping the exciting current in the generator exciting circuit, when a chopping mark exists, and the generator exciting voltage is judged to be smaller than a preset voltage value and the frequency is judged to be smaller than a preset frequency value