A method and apparatus for wind drying control of a generator excitation DC bus

Abstract

The application discloses a kind of generator excitation DC bus air drying control method and device, it is related to generator air drying technical field, including obtaining generator past state information and corresponding excitation circuit air passage past temperature and humidity information, and define generator state and excitation circuit air passage temperature and humidity state;Real-time state information and corresponding real-time excitation circuit air passage temperature and humidity information of generator are obtained, and based on generator state and excitation circuit air passage temperature and humidity state determine generator real-time state and temperature and humidity real-time state;According to generator real-time state and temperature and humidity real-time state control air door opening degree and dry hot air device control parameter carries out air drying process;In air drying process, while monitoring real-time excitation circuit air passage temperature and humidity information, and adjust air door opening degree and dry hot air device control parameter.Guarantee the precision of dry hot air device control, avoid the problem of power being too high or too low, improve the adaptability of air drying control.

Description

Technical Field

[0001] This application relates to the field of generator drying technology, and more specifically, to a generator excitation DC bus drying control method and device. Background Technology

[0002] Generator excitation DC bus air drying control is an important technical means used to protect the insulation performance of the generator excitation system and improve the reliability and stability of the equipment. The generator excitation DC bus is a key component connecting the excitation equipment and the excitation brushes, directly affecting the performance and operating status of the excitation system. However, due to the generator's operating environment and shutdown status, the excitation DC bus may be affected by moisture, leading to problems such as insulation aging and leakage.

[0003] During generator operation, the excitation DC bus generates heat, which helps evaporate moisture in the ventilation ducts. However, when the generator is shut down, moisture may remain in the ventilation ducts, especially in high-humidity environments. Accumulated moisture can degrade the insulation performance of the excitation DC bus, increasing the risk of leakage and potentially leading to excitation system failure.

[0004] In existing technologies, drying hot air devices with fixed damper openings and parameters are often used to dry the DC excitation bus of a generator. However, generator operating conditions are complex, and if the power of the drying hot air device is too low, the bus will still be heavily moist, affecting insulation performance. If the power of the drying hot air device is too high, the temperature inside the ventilation duct may become too high, or even overheat, increasing energy consumption and potentially causing equipment overload or damage.

[0005] Therefore, how to improve the opening degree of the windbreak and the accuracy and adaptability of the control of the drying hot air device are technical problems that need to be solved. Summary of the Invention

[0006] This invention provides a method for controlling the air drying of a generator excitation DC bus, addressing the technical problems of poor accuracy and adaptability in the control of damper opening and drying hot air devices in existing technologies. This method is applied to a system that includes a damper installed on the excitation circuit ventilation duct and a drying hot air device installed at the DC bus of the generator excitation sealing bus ventilation duct. The method includes:

[0007] Obtain past status information of the generator and the corresponding past temperature and humidity information of the excitation circuit ventilation duct, and define the generator status and the temperature and humidity status of the excitation circuit ventilation duct.

[0008] Acquire real-time generator status information and corresponding real-time excitation circuit ventilation duct temperature and humidity information, and determine the real-time generator status and real-time temperature and humidity status based on the generator status and the excitation circuit ventilation duct temperature and humidity status.

[0009] The air-drying process is carried out by controlling the opening of the windbreak and the control parameters of the drying hot air device according to the real-time status of the generator and the real-time status of temperature and humidity.

[0010] During the air-drying process, the temperature and humidity information of the excitation circuit ventilation duct in real time are monitored, and the opening of the windbreak door and the control parameters of the drying hot air device are adjusted.

[0011] In some embodiments of this application, the generator state and the temperature and humidity state of the excitation circuit ventilation duct are defined, including:

[0012] The generator state is defined as follows:

[0013] When the generator is in operation, the generator operating load is obtained, and the excitation heat is determined based on the generator operating load. The generator state is determined as either the first operating state requiring air drying or the first operating state not requiring air drying based on the excitation heat.

[0014] When the generator is in a shutdown state, the ambient temperature and humidity information of the generator is obtained, and the generator status is determined as either the first shutdown requiring air drying state or the first shutdown not requiring air drying state based on the shutdown time and the ambient temperature and humidity information of the generator.

[0015] The temperature and humidity conditions of the excitation circuit ventilation duct are defined as follows:

[0016] When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that requires air drying.

[0017] When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct do not exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that does not require air drying.

[0018] When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown drying state.

[0019] When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct do not exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown state where drying is not required.

[0020] In some embodiments of this application, the real-time generator status and real-time temperature and humidity status are determined based on the generator status and the temperature and humidity status of the excitation circuit ventilation duct, including:

[0021] Calculate the degree of matching between the generator's real-time status information and the first operating state requiring air drying, the first operating state not requiring air drying, the first shutdown state requiring air drying, and the first shutdown state not requiring air drying, and take the state with the highest degree of matching as the generator's real-time status;

[0022] Calculate the matching degree between the real-time temperature and humidity information of the excitation circuit ventilation duct and the second operating state requiring air drying, the second operating state not requiring air drying, the second shutdown state requiring air drying, and the second shutdown state not requiring air drying. The state with the highest matching degree is taken as the real-time temperature and humidity state.

[0023] In some embodiments of this application, the drying process is carried out by controlling the opening of the windshield and the control parameters of the drying hot air device according to the real-time status of the generator and the real-time temperature and humidity status, including:

[0024] The first operating condition requiring air drying is subdivided into multiple first operating conditions requiring air drying based on the excitation heat. Different excitation heat ranges correspond to different degrees of the first operating condition requiring air drying. The second operating condition requiring air drying is subdivided into multiple second operating conditions requiring air drying based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the first temperature and humidity value. Different excess ranges correspond to different degrees of the second operating condition requiring air drying. The different degrees of the first operating condition requiring air drying and the second operating condition requiring air drying together correspond to a target opening degree of the windbreak and a target control parameter group for the drying hot air device.

[0025] The first shutdown drying state is further subdivided into multiple first shutdown drying states based on the shutdown time and the ambient temperature and humidity information of the generator. Different shutdown times and ambient temperature and humidity information of the generator correspond to different degrees of the first shutdown drying state. The second shutdown drying state is further subdivided into multiple second shutdown drying states based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the second temperature and humidity value. Different excess amounts correspond to different degrees of the second shutdown drying state. The different degrees of the first shutdown drying state and the second shutdown drying state together correspond to a target opening degree of the windbreak and a target control parameter group of the drying hot air device.

[0026] The drying process is controlled based on the target opening degree of the windbreak and the target control parameter set of the drying hot air device.

[0027] In some embodiments of this application, during the drying process, the temperature and humidity information of the excitation circuit ventilation duct in real time is monitored simultaneously, and the opening degree of the windbreak and the control parameters of the drying hot air device are adjusted, including:

[0028] If the real-time excitation circuit ventilation duct temperature and humidity information is located to the right of the reasonable range, then the first correction coefficient pair is determined based on the difference between the temperature and humidity and the right endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the first correction coefficient pair.

[0029] If the real-time excitation circuit ventilation duct temperature and humidity information is located to the left of the reasonable range, then the second correction coefficient pair is determined based on the difference between the temperature and humidity and the left endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the second correction coefficient pair.

[0030] If the real-time temperature and humidity information of the excitation circuit ventilation duct is within a reasonable range, then no correction will be made to the target opening degree of the windbreak door and the target control parameter group of the drying hot air device.

[0031] Correspondingly, this application also provides a generator excitation DC bus drying control device, applied to a system including a windbreak installed on the excitation circuit ventilation duct and a drying hot air device installed at the DC bus of the generator excitation sealing bus ventilation duct, the device comprising:

[0032] The first module is used to obtain the generator's past status information and the corresponding past temperature and humidity information of the excitation circuit ventilation duct, and to define the generator status and the temperature and humidity status of the excitation circuit ventilation duct.

[0033] The second module is used to acquire real-time generator status information and corresponding real-time excitation circuit ventilation duct temperature and humidity information, and to determine the real-time generator status and real-time temperature and humidity status based on the generator status and the excitation circuit ventilation duct temperature and humidity status.

[0034] The third module is used to control the opening of the windbreak and the control parameters of the drying hot air device to carry out the air drying process based on the real-time status of the generator and the real-time status of temperature and humidity.

[0035] The fourth module is used to simultaneously monitor the real-time temperature and humidity information of the excitation circuit ventilation duct during the air drying process, and adjust the opening of the windbreak and the control parameters of the drying hot air device.

[0036] In some embodiments of this application, the first module is used for:

[0037] The generator state is defined as follows:

[0038] When the generator is in operation, the generator operating load is obtained, and the excitation heat is determined based on the generator operating load. The generator state is determined as either the first operating state requiring air drying or the first operating state not requiring air drying based on the excitation heat.

[0039] When the generator is in a shutdown state, the ambient temperature and humidity information of the generator is obtained, and the generator status is determined as either the first shutdown requiring air drying state or the first shutdown not requiring air drying state based on the shutdown time and the ambient temperature and humidity information of the generator.

[0040] The temperature and humidity conditions of the excitation circuit ventilation duct are defined as follows:

[0041] When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that requires air drying.

[0042] When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct do not exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that does not require air drying.

[0043] When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown drying state.

[0044] When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct do not exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown state where drying is not required.

[0045] In some embodiments of this application, the second module is used for:

[0046] Calculate the degree of matching between the generator's real-time status information and the first operating state requiring air drying, the first operating state not requiring air drying, the first shutdown state requiring air drying, and the first shutdown state not requiring air drying, and take the state with the highest degree of matching as the generator's real-time status;

[0047] Calculate the matching degree between the real-time temperature and humidity information of the excitation circuit ventilation duct and the second operating state requiring air drying, the second operating state not requiring air drying, the second shutdown state requiring air drying, and the second shutdown state not requiring air drying. The state with the highest matching degree is taken as the real-time temperature and humidity state.

[0048] In some embodiments of this application, the third module is used for:

[0049] The first operating condition requiring air drying is subdivided into multiple first operating conditions requiring air drying based on the excitation heat. Different excitation heat ranges correspond to different degrees of the first operating condition requiring air drying. The second operating condition requiring air drying is subdivided into multiple second operating conditions requiring air drying based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the first temperature and humidity value. Different excess ranges correspond to different degrees of the second operating condition requiring air drying. The different degrees of the first operating condition requiring air drying and the second operating condition requiring air drying together correspond to a target opening degree of the windbreak and a target control parameter group for the drying hot air device.

[0050] The first shutdown drying state is further subdivided into multiple first shutdown drying states based on the shutdown time and the ambient temperature and humidity information of the generator. Different shutdown times and ambient temperature and humidity information of the generator correspond to different degrees of the first shutdown drying state. The second shutdown drying state is further subdivided into multiple second shutdown drying states based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the second temperature and humidity value. Different excess amounts correspond to different degrees of the second shutdown drying state. The different degrees of the first shutdown drying state and the second shutdown drying state together correspond to a target opening degree of the windbreak and a target control parameter group of the drying hot air device.

[0051] The drying process is controlled based on the target opening degree of the windbreak and the target control parameter set of the drying hot air device.

[0052] In some embodiments of this application, the fourth module is used for:

[0053] If the real-time excitation circuit ventilation duct temperature and humidity information is located to the right of the reasonable range, then the first correction coefficient pair is determined based on the difference between the temperature and humidity and the right endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the first correction coefficient pair.

[0054] If the real-time excitation circuit ventilation duct temperature and humidity information is located to the left of the reasonable range, then the second correction coefficient pair is determined based on the difference between the temperature and humidity and the left endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the second correction coefficient pair.

[0055] If the real-time temperature and humidity information of the excitation circuit ventilation duct is within a reasonable range, then no correction will be made to the target opening degree of the windbreak door and the target control parameter group of the drying hot air device.

[0056] By applying the above technical solutions, the previous state information of the generator and the corresponding previous temperature and humidity information of the excitation circuit ventilation duct are obtained, and the generator state and the temperature and humidity status of the excitation circuit ventilation duct are defined; the real-time state information of the generator and the corresponding real-time temperature and humidity information of the excitation circuit ventilation duct are obtained, and the real-time state of the generator and the real-time temperature and humidity status are determined based on the generator state and the temperature and humidity status of the excitation circuit ventilation duct; the opening of the damper and the control parameters of the drying hot air device are controlled according to the real-time state of the generator and the real-time temperature and humidity status to carry out the drying process; during the drying process, the real-time temperature and humidity information of the excitation circuit ventilation duct is monitored simultaneously, and the opening of the damper and the control parameters of the drying hot air device are adjusted accordingly. This application improves the drying effect, ensures the accuracy of the control of the drying hot air device, avoids the problem of excessively high or low power by defining and determining the generator state and the temperature and humidity status of the excitation circuit ventilation duct, and determines the control parameters according to the specific conditions of the state. It also improves the adaptability of the drying control by setting control parameters according to the specific temperature and humidity conditions and the generator state. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 A schematic flowchart of a generator excitation DC bus air-drying control method according to an embodiment of the present invention is shown;

[0059] Figure 2 A schematic diagram of a generator excitation DC bus air drying control device according to an embodiment of the present invention is shown. Detailed Implementation

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

[0061] This application provides a method for controlling the drying of the DC bus of a generator excitation circuit, which is applied to a system that includes installing a windbreak door on the ventilation duct of the excitation circuit and installing a drying hot air device at the DC bus of the generator excitation circuit ventilation duct.

[0062] Operable dampers for the excitation circuit ventilation duct: Installing operable dampers on the excitation circuit ventilation duct is an effective measure. The ventilation duct can be closed when the generator is stopped, reducing the impact of external moisture on the excitation circuit. This effectively prevents moisture from entering the generator, reducing humidity and moisture content, thereby protecting the excitation circuit and electrical equipment from moisture corrosion. The operation of the dampers can be controlled according to the shutdown or operation status, ensuring that the ventilation duct is closed when the generator is stopped and opened when the generator is running to maintain proper ventilation and heat dissipation.

[0063] A hot air drying device is installed at the DC bus: This device dries the excitation brush holder and DC bus during generator shutdown by providing hot air to reduce humidity within the ventilation duct, ensuring the surfaces of the excitation brush holder and DC bus remain dry. A dry DC bus improves the insulation performance of the excitation DC circuit, reduces the likelihood of insulation aging and failures, and enhances the generator's stability and reliability.

[0064] These two measures, combined, can effectively protect the generator excitation system, reduce the impact of moisture and humidity on the excitation circuit, and improve the insulation performance and equipment reliability of the excitation DC circuit. However, for specific generators and excitation systems, the design and implementation of these measures require full consideration of engineering and safety factors, and must ensure compliance with relevant standards and specifications.

[0065] like Figure 1 As shown, the method includes the following steps:

[0066] Step S101: Obtain the generator's past status information and the corresponding past temperature and humidity information of the excitation circuit ventilation duct, and define the generator status and the temperature and humidity status of the excitation circuit ventilation duct.

[0067] In this embodiment, the need for air drying is determined by both the generator's state and the temperature and humidity status of the excitation circuit ventilation duct. Combining these two factors ensures the effectiveness of the air drying process.

[0068] In some embodiments of this application, the generator state and the temperature and humidity state of the excitation circuit ventilation duct are defined, including:

[0069] The generator state is defined as follows:

[0070] When the generator is in operation, the generator operating load is obtained, and the excitation heat is determined based on the generator operating load. The generator state is determined as either the first operating state requiring air drying or the first operating state not requiring air drying based on the excitation heat.

[0071] When the generator is in a shutdown state, the ambient temperature and humidity information of the generator is obtained, and the generator status is determined as either the first shutdown requiring air drying state or the first shutdown not requiring air drying state based on the shutdown time and the ambient temperature and humidity information of the generator.

[0072] The temperature and humidity conditions of the excitation circuit ventilation duct are defined as follows:

[0073] When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that requires air drying.

[0074] When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct do not exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that does not require air drying.

[0075] When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown drying state.

[0076] When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct do not exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown state where drying is not required.

[0077] In this embodiment, if either the generator state or the temperature and humidity state of the excitation circuit ventilation duct requires drying, then drying will be carried out, but the degree of drying will be slightly lower than that of subsequent steps.

[0078] Step S102: Obtain the real-time status information of the generator and the corresponding real-time temperature and humidity information of the excitation circuit ventilation duct, and determine the real-time status of the generator and the real-time temperature and humidity status based on the generator status and the temperature and humidity status of the excitation circuit ventilation duct.

[0079] In some embodiments of this application, the real-time generator status and real-time temperature and humidity status are determined based on the generator status and the temperature and humidity status of the excitation circuit ventilation duct, including:

[0080] Calculate the degree of matching between the generator's real-time status information and the first operating state requiring air drying, the first operating state not requiring air drying, the first shutdown state requiring air drying, and the first shutdown state not requiring air drying, and take the state with the highest degree of matching as the generator's real-time status;

[0081] Calculate the matching degree between the real-time temperature and humidity information of the excitation circuit ventilation duct and the second operating state requiring air drying, the second operating state not requiring air drying, the second shutdown state requiring air drying, and the second shutdown state not requiring air drying. The state with the highest matching degree is taken as the real-time temperature and humidity state.

[0082] In this embodiment, the degree of matching is essentially the matching of parameter similarity.

[0083] Step S103: The opening of the windbreak door and the control parameters of the drying hot air device are controlled according to the real-time status of the generator and the real-time status of temperature and humidity to carry out the drying process.

[0084] In this embodiment, the drying hot air device can regulate the drying process by controlling the following parameters:

[0085] Hot air temperature: The temperature of the generated hot air can be controlled by adjusting the power of the heating element (e.g., an electric heater) of the hot air device or by controlling the feedback signal of the temperature sensor. Adjusting the hot air temperature can dry the moisture in the ventilation duct as needed.

[0086] Hot air flow rate: The flow rate of hot air generated by the hot air device can be controlled by adjusting the fan speed or controlling the fan's start and stop. Controlling the hot air flow rate can affect the rate at which moisture is discharged, thereby regulating the humidity within the ventilation duct.

[0087] Hot air operation time: The operation time of the hot air device can be set to control its continuous operation within a certain period of time. As needed, periodic operation or continuous operation can be set to ensure effective drying of moisture in the ventilation duct.

[0088] The above parameters are merely an example and not an exhaustive list; all other controllable parameters fall within the scope of protection of this application.

[0089] In some embodiments of this application, the drying process is carried out by controlling the opening of the windshield and the control parameters of the drying hot air device according to the real-time status of the generator and the real-time temperature and humidity status, including:

[0090] The first operating condition requiring air drying is subdivided into multiple first operating conditions requiring air drying based on the excitation heat. Different excitation heat ranges correspond to different degrees of the first operating condition requiring air drying. The second operating condition requiring air drying is subdivided into multiple second operating conditions requiring air drying based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the first temperature and humidity value. Different excess ranges correspond to different degrees of the second operating condition requiring air drying. The different degrees of the first operating condition requiring air drying and the second operating condition requiring air drying together correspond to a target opening degree of the windbreak and a target control parameter group for the drying hot air device.

[0091] The first shutdown drying state is further subdivided into multiple first shutdown drying states based on the shutdown time and the ambient temperature and humidity information of the generator. Different shutdown times and ambient temperature and humidity information of the generator correspond to different degrees of the first shutdown drying state. The second shutdown drying state is further subdivided into multiple second shutdown drying states based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the second temperature and humidity value. Different excess amounts correspond to different degrees of the second shutdown drying state. The different degrees of the first shutdown drying state and the second shutdown drying state together correspond to a target opening degree of the windbreak and a target control parameter group of the drying hot air device.

[0092] The drying process is controlled based on the target opening degree of the windbreak and the target control parameter set of the drying hot air device.

[0093] In step S104, during the air-drying process, the temperature and humidity information of the excitation circuit ventilation duct in real time is monitored, and the opening of the windbreak door and the control parameters of the drying hot air device are adjusted.

[0094] In this embodiment, the target control parameters are adjusted according to the temperature and humidity of the ventilation duct in the excitation circuit.

[0095] In some embodiments of this application, during the drying process, the temperature and humidity information of the excitation circuit ventilation duct in real time is monitored simultaneously, and the opening degree of the windbreak and the control parameters of the drying hot air device are adjusted, including:

[0096] If the real-time excitation circuit ventilation duct temperature and humidity information is located to the right of the reasonable range, then the first correction coefficient pair is determined based on the difference between the temperature and humidity and the right endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the first correction coefficient pair.

[0097] If the real-time excitation circuit ventilation duct temperature and humidity information is located to the left of the reasonable range, then the second correction coefficient pair is determined based on the difference between the temperature and humidity and the left endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the second correction coefficient pair.

[0098] If the real-time temperature and humidity information of the excitation circuit ventilation duct is within a reasonable range, then no correction will be made to the target opening degree of the windbreak door and the target control parameter group of the drying hot air device.

[0099] In this embodiment, "correction" means that the correction coefficient * the target control parameter = the corrected control parameter.

[0100] By applying the above technical solutions, the previous state information of the generator and the corresponding previous temperature and humidity information of the excitation circuit ventilation duct are obtained, and the generator state and the temperature and humidity status of the excitation circuit ventilation duct are defined; the real-time state information of the generator and the corresponding real-time temperature and humidity information of the excitation circuit ventilation duct are obtained, and the real-time state of the generator and the real-time temperature and humidity status are determined based on the generator state and the temperature and humidity status of the excitation circuit ventilation duct; the opening of the damper and the control parameters of the drying hot air device are controlled according to the real-time state of the generator and the real-time temperature and humidity status to carry out the drying process; during the drying process, the real-time temperature and humidity information of the excitation circuit ventilation duct is monitored simultaneously, and the opening of the damper and the control parameters of the drying hot air device are adjusted accordingly. This application improves the drying effect, ensures the accuracy of the control of the drying hot air device, avoids the problem of excessively high or low power by defining and determining the generator state and the temperature and humidity status of the excitation circuit ventilation duct, and determines the control parameters according to the specific conditions of the state. It also improves the adaptability of the drying control by setting control parameters according to the specific temperature and humidity conditions and the generator state.

[0101] Through the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be implemented in hardware or by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) and includes several instructions to cause a computer device (such as a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0102] Correspondingly, this application also provides a generator excitation DC bus drying control device, applied to a system that includes a windbreak installed on the excitation circuit ventilation duct and a drying hot air device installed at the DC bus of the generator excitation sealing bus ventilation duct, such as... Figure 2 As shown, the device includes:

[0103] The first module 201 is used to obtain the generator's past status information and the corresponding past temperature and humidity information of the excitation circuit ventilation duct, and to define the generator status and the temperature and humidity status of the excitation circuit ventilation duct.

[0104] The second module 202 is used to acquire the real-time status information of the generator and the corresponding real-time temperature and humidity information of the excitation circuit ventilation duct, and to determine the real-time status of the generator and the real-time temperature and humidity status based on the generator status and the temperature and humidity status of the excitation circuit ventilation duct.

[0105] The third module 203 is used to control the opening of the windbreak and the control parameters of the drying hot air device according to the real-time status of the generator and the real-time status of temperature and humidity to carry out the air drying process.

[0106] The fourth module 204 is used to simultaneously monitor the real-time temperature and humidity information of the excitation circuit ventilation duct during the air drying process, and adjust the opening of the windbreak and the control parameters of the drying hot air device.

[0107] In some embodiments of this application, the first module 201 is used for:

[0108] The generator state is defined as follows:

[0109] When the generator is in operation, the generator operating load is obtained, and the excitation heat is determined based on the generator operating load. The generator state is determined as either the first operating state requiring air drying or the first operating state not requiring air drying based on the excitation heat.

[0110] When the generator is in a shutdown state, the ambient temperature and humidity information of the generator is obtained, and the generator status is determined as either the first shutdown requiring air drying state or the first shutdown not requiring air drying state based on the shutdown time and the ambient temperature and humidity information of the generator.

[0111] The temperature and humidity conditions of the excitation circuit ventilation duct are defined as follows:

[0112] When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that requires air drying.

[0113] When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct do not exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that does not require air drying.

[0114] When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown drying state.

[0115] When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct do not exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown state where drying is not required.

[0116] In some embodiments of this application, the second module 202 is used for:

[0117] Calculate the degree of matching between the generator's real-time status information and the first operating state requiring air drying, the first operating state not requiring air drying, the first shutdown state requiring air drying, and the first shutdown state not requiring air drying, and take the state with the highest degree of matching as the generator's real-time status;

[0118] Calculate the matching degree between the real-time temperature and humidity information of the excitation circuit ventilation duct and the second operating state requiring air drying, the second operating state not requiring air drying, the second shutdown state requiring air drying, and the second shutdown state not requiring air drying. The state with the highest matching degree is taken as the real-time temperature and humidity state.

[0119] In some embodiments of this application, the third module 203 is used for:

[0120] The first operating condition requiring air drying is subdivided into multiple first operating conditions requiring air drying based on the excitation heat. Different excitation heat ranges correspond to different degrees of the first operating condition requiring air drying. The second operating condition requiring air drying is subdivided into multiple second operating conditions requiring air drying based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the first temperature and humidity value. Different excess ranges correspond to different degrees of the second operating condition requiring air drying. The different degrees of the first operating condition requiring air drying and the second operating condition requiring air drying together correspond to a target opening degree of the windbreak and a target control parameter group for the drying hot air device.

[0121] The first shutdown drying state is further subdivided into multiple first shutdown drying states based on the shutdown time and the ambient temperature and humidity information of the generator. Different shutdown times and ambient temperature and humidity information of the generator correspond to different degrees of the first shutdown drying state. The second shutdown drying state is further subdivided into multiple second shutdown drying states based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the second temperature and humidity value. Different excess amounts correspond to different degrees of the second shutdown drying state. The different degrees of the first shutdown drying state and the second shutdown drying state together correspond to a target opening degree of the windbreak and a target control parameter group of the drying hot air device.

[0122] The drying process is controlled based on the target opening degree of the windbreak and the target control parameter set of the drying hot air device.

[0123] In some embodiments of this application, the fourth module 204 is used for:

[0124] If the real-time excitation circuit ventilation duct temperature and humidity information is located to the right of the reasonable range, then the first correction coefficient pair is determined based on the difference between the temperature and humidity and the right endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the first correction coefficient pair.

[0125] If the real-time excitation circuit ventilation duct temperature and humidity information is located to the left of the reasonable range, then the second correction coefficient pair is determined based on the difference between the temperature and humidity and the left endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the second correction coefficient pair.

[0126] If the real-time temperature and humidity information of the excitation circuit ventilation duct is within a reasonable range, then no correction will be made to the target opening degree of the windbreak door and the target control parameter group of the drying hot air device.

[0127] Those skilled in the art will understand that the modules in the apparatus of the implementation scenario can be distributed within the apparatus of the implementation scenario as described, or they can be located in one or more apparatuses different from this implementation scenario with corresponding changes. The modules of the above-mentioned implementation scenario can be combined into one module, or they can be further divided into multiple sub-modules.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for controlling the drying of a generator excitation DC bus, applied in a system including installing a windbreak on the excitation circuit ventilation duct and installing a drying hot air device at the DC bus of the generator excitation sealing bus ventilation duct, characterized in that, The method includes: Obtain past status information of the generator and the corresponding past temperature and humidity information of the excitation circuit ventilation duct, and define the generator status and the temperature and humidity status of the excitation circuit ventilation duct. Acquire real-time generator status information and corresponding real-time excitation circuit ventilation duct temperature and humidity information, and determine the real-time generator status and real-time temperature and humidity status based on the generator status and the excitation circuit ventilation duct temperature and humidity status. The air-drying process is carried out by controlling the opening of the windbreak and the control parameters of the drying hot air device according to the real-time status of the generator and the real-time status of temperature and humidity. During the air-drying process, the temperature and humidity information of the excitation circuit ventilation duct in real time is monitored, and the opening of the windbreak door and the control parameters of the drying hot air device are adjusted. The generator state is defined as follows: When the generator is in operation, the generator operating load is obtained, and the excitation heat is determined based on the generator operating load. The generator state is determined as either the first operating state requiring air drying or the first operating state not requiring air drying based on the excitation heat. When the generator is in a shutdown state, the ambient temperature and humidity information of the generator is acquired, and the generator status is determined based on the shutdown time and ambient temperature and humidity information of the generator: either the first shutdown requiring air drying state or the first shutdown not requiring air drying state.

2. The generator excitation DC bus air-drying control method as described in claim 1, characterized in that, It also defines the generator status and the temperature and humidity status of the excitation circuit ventilation duct, including: The temperature and humidity conditions of the excitation circuit ventilation duct are defined as follows: When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that requires air drying. When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct do not exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that does not require air drying. When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown drying state. When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct do not exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown state where drying is not required.

3. The generator excitation DC bus air drying control method as described in claim 2, characterized in that, The real-time generator status and real-time temperature and humidity status are determined based on the generator status and the temperature and humidity status of the excitation circuit ventilation duct, including: Calculate the degree of matching between the generator's real-time status information and the first operating state requiring air drying, the first operating state not requiring air drying, the first shutdown state requiring air drying, and the first shutdown state not requiring air drying, and take the state with the highest degree of matching as the generator's real-time status; Calculate the matching degree between the real-time temperature and humidity information of the excitation circuit ventilation duct and the second operating state requiring air drying, the second operating state not requiring air drying, the second shutdown state requiring air drying, and the second shutdown state not requiring air drying. The state with the highest matching degree is taken as the real-time temperature and humidity state.

4. The generator excitation DC bus air drying control method as described in claim 2, characterized in that, The drying process is carried out by controlling the opening of the damper and the control parameters of the drying hot air device according to the real-time status of the generator and the real-time temperature and humidity, including: The first operating condition requiring air drying is subdivided into multiple first operating conditions requiring air drying based on the excitation heat. Different excitation heat ranges correspond to different degrees of the first operating condition requiring air drying. The second operating condition requiring air drying is subdivided into multiple second operating conditions requiring air drying based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the first temperature and humidity value. Different excess ranges correspond to different degrees of the second operating condition requiring air drying. The different degrees of the first operating condition requiring air drying and the second operating condition requiring air drying together correspond to a target opening degree of the windbreak and a target control parameter group for the drying hot air device. The first shutdown drying state is further subdivided into multiple first shutdown drying states based on the shutdown time and the ambient temperature and humidity information of the generator. Different shutdown times and ambient temperature and humidity information of the generator correspond to different degrees of the first shutdown drying state. The second shutdown drying state is further subdivided into multiple second shutdown drying states based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the second temperature and humidity value. Different excess amounts correspond to different degrees of the second shutdown drying state. The different degrees of the first shutdown drying state and the second shutdown drying state together correspond to a target opening degree of the windbreak and a target control parameter group of the drying hot air device. The drying process is controlled based on the target opening degree of the windbreak and the target control parameter set of the drying hot air device.

5. The generator excitation DC bus air-drying control method as described in claim 4, characterized in that, During the air-drying process, the real-time temperature and humidity information of the excitation circuit ventilation duct is monitored, and the opening of the windbreak and the control parameters of the drying hot air device are adjusted, including: If the real-time excitation circuit ventilation duct temperature and humidity information is located to the right of the reasonable range, then the first correction coefficient pair is determined based on the difference between the temperature and humidity and the right endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the first correction coefficient pair. If the real-time excitation circuit ventilation duct temperature and humidity information is located to the left of the reasonable range, then the second correction coefficient pair is determined based on the difference between the temperature and humidity and the left endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the second correction coefficient pair. If the real-time temperature and humidity information of the excitation circuit ventilation duct is within a reasonable range, then no correction will be made to the target opening degree of the windbreak door and the target control parameter group of the drying hot air device.

6. A generator excitation DC bus drying control device, applied in a system including a windbreak installed on the excitation circuit ventilation duct and a drying hot air device installed at the DC bus of the generator excitation sealing bus ventilation duct, characterized in that, The air-drying control device includes: The first module is used to obtain the generator's past status information and the corresponding past temperature and humidity information of the excitation circuit ventilation duct, and to define the generator status and the temperature and humidity status of the excitation circuit ventilation duct. The second module is used to acquire real-time generator status information and corresponding real-time excitation circuit ventilation duct temperature and humidity information, and to determine the real-time generator status and real-time temperature and humidity status based on the generator status and the excitation circuit ventilation duct temperature and humidity status. The third module is used to control the opening of the windbreak and the control parameters of the drying hot air device to carry out the air drying process based on the real-time status of the generator and the real-time status of temperature and humidity. The fourth module is used to simultaneously monitor the real-time temperature and humidity information of the excitation circuit ventilation duct during the air drying process, and adjust the opening of the windbreak and the control parameters of the drying hot air device. The generator state is defined as follows: When the generator is in operation, the generator operating load is obtained, and the excitation heat is determined based on the generator operating load. The generator state is determined as either the first operating state requiring air drying or the first operating state not requiring air drying based on the excitation heat. When the generator is in a shutdown state, the ambient temperature and humidity information of the generator is acquired, and the generator status is determined based on the shutdown time and ambient temperature and humidity information of the generator: either the first shutdown requiring air drying state or the first shutdown not requiring air drying state.

7. The generator excitation DC bus air drying control device as described in claim 6, characterized in that, The first module is used for: The temperature and humidity conditions of the excitation circuit ventilation duct are defined as follows: When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that requires air drying. When the generator is in operation and the temperature and humidity of the excitation circuit ventilation duct do not exceed the first temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second operating state that does not require air drying. When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown drying state. When the generator is in a shutdown state and the temperature and humidity of the excitation circuit ventilation duct do not exceed the second temperature and humidity value, the temperature and humidity state of the excitation circuit ventilation duct is the second shutdown state where drying is not required.

8. The generator excitation DC bus air drying control device as described in claim 7, characterized in that, The second module is used for: Calculate the degree of matching between the generator's real-time status information and the first operating state requiring air drying, the first operating state not requiring air drying, the first shutdown state requiring air drying, and the first shutdown state not requiring air drying, and take the state with the highest degree of matching as the generator's real-time status; Calculate the matching degree between the real-time temperature and humidity information of the excitation circuit ventilation duct and the second operating state requiring air drying, the second operating state not requiring air drying, the second shutdown state requiring air drying, and the second shutdown state not requiring air drying. The state with the highest matching degree is taken as the real-time temperature and humidity state.

9. The generator excitation DC bus air drying control device as described in claim 7, characterized in that, The third module is used for: The first operating condition requiring air drying is subdivided into multiple first operating conditions requiring air drying based on the excitation heat. Different excitation heat ranges correspond to different degrees of the first operating condition requiring air drying. The second operating condition requiring air drying is subdivided into multiple second operating conditions requiring air drying based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the first temperature and humidity value. Different excess ranges correspond to different degrees of the second operating condition requiring air drying. The different degrees of the first operating condition requiring air drying and the second operating condition requiring air drying together correspond to a target opening degree of the windbreak and a target control parameter group for the drying hot air device. The first shutdown drying state is further subdivided into multiple first shutdown drying states based on the shutdown time and the ambient temperature and humidity information of the generator. Different shutdown times and ambient temperature and humidity information of the generator correspond to different degrees of the first shutdown drying state. The second shutdown drying state is further subdivided into multiple second shutdown drying states based on the amount by which the temperature and humidity of the excitation circuit ventilation duct exceeds the second temperature and humidity value. Different excess amounts correspond to different degrees of the second shutdown drying state. The different degrees of the first shutdown drying state and the second shutdown drying state together correspond to a target opening degree of the windbreak and a target control parameter group of the drying hot air device. The drying process is controlled based on the target opening degree of the windbreak and the target control parameter set of the drying hot air device.

10. The generator excitation DC bus air drying control device as described in claim 9, characterized in that, The fourth module is used for: If the real-time excitation circuit ventilation duct temperature and humidity information is located to the right of the reasonable range, then the first correction coefficient pair is determined based on the difference between the temperature and humidity and the right endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the first correction coefficient pair. If the real-time excitation circuit ventilation duct temperature and humidity information is located to the left of the reasonable range, then the second correction coefficient pair is determined based on the difference between the temperature and humidity and the left endpoint of the reasonable range, and the target opening of the windbreak door and a certain target control parameter in the target control parameter group of the drying hot air device are corrected based on the second correction coefficient pair. If the real-time temperature and humidity information of the excitation circuit ventilation duct is within a reasonable range, then no correction will be made to the target opening degree of the windbreak door and the target control parameter group of the drying hot air device.

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