Generator excitation system power cabinet bridge arm current control method, equipment and medium

Abstract

The invention discloses a power cabinet bridge arm current control method and device for a generator excitation system and a medium, and the method is applied to the generator excitation system, and comprises the steps: S1, reading a bridge arm current value of each power cabinet; s2, judging whether a bridge arm current control permission condition is met or not; if not, the bridge arm heat accumulation value is set to be 0; if yes, executing the step S3; s3, obtaining the average current of the power cabinet, and judging whether the current bridge arm current is greater than the average current of the power cabinet; if yes, bridge arm heat accumulation value accumulation operation is executed; if yes, performing bridge arm heat accumulation value cumulative subtraction operation; s4, executing control according to the current bridge arm heat accumulation value: if the current bridge arm heat accumulation value is greater than 1, triggering a bridge arm current control signal to act; and if the current bridge arm heat accumulation value is less than 0, triggering the bridge arm current control signal to reset. Control is executed based on the heat accumulation value, and thermal runaway of the power cabinet silicon controlled rectifier is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power control, and in particular to a method, device and medium for controlling a bridge arm current of a power cabinet of a generator excitation system. Background Art

[0002] The static thyristor excitation system of a large generator needs to be equipped with multiple power cabinets to provide excitation current to the rotor. The magnitude of the generator excitation current is controlled by controlling the trigger angle of the power cabinet thyristor to ensure the stability of the generator terminal voltage. The operation of multiple power cabinets in parallel may cause current imbalance, which is manifested as a larger current in one power cabinet and a smaller current in another power cabinet. In order to balance the load between the power cabinets, the existing technology usually adopts the method of controlling the thyristor trigger angle of each power cabinet to achieve the purpose of balancing the load between the power cabinets. However, due to factors such as the thyristor on-resistance, the heat sink crimping process, and the anode voltage drop, this method will still lead to imbalanced bridge arm currents between different power cabinets. Ultimately, the only way to avoid imbalanced power cabinet bridge arm currents is to use thyristors with consistent characteristics and consistent anode cable lengths for each power cabinet.

[0003] The existing generator excitation system power cabinet current equalization technology cannot achieve the purpose of balancing the current in the bridge arms of each power cabinet, which may cause the bridge arm of a power cabinet to be overloaded, resulting in thermal runaway of the power cabinet thyristor and loss of excitation of the generator; the characteristics of the thyristors in the same batch are consistent when they leave the factory, but after being crimped to the heat sink and assembled in the cabinet, the resistance characteristics of the thyristor bridge arm will have large differences; each power cabinet is connected to the anode power supply through an anode cable of the same length, which is costly and the anode cable heats up severely, making it inconvenient for subsequent maintenance. Summary of the Invention

[0004] To solve the above problems, the present invention provides a method, device and medium for controlling the bridge arm current of a power cabinet in a generator excitation system. By performing thermal accumulation integration on the bridge arm current of the power cabinet, the thermal accumulation of the thyristor in the bridge arm is indirectly monitored. Control is performed based on the thermal accumulation value. When the thermal accumulation of the thyristor in a bridge arm of the power cabinet exceeds a threshold, the bridge arm current is reduced by reducing the trigger angle of the thyristor in the power cabinet, thereby avoiding thermal runaway of the thyristor in the power cabinet.

[0005] The present invention provides a method for controlling the bridge arm current of a power cabinet in a generator excitation system, which is applied to the generator excitation system. The specific technical solution is as follows: S1: Read the bridge arm current value of each power cabinet; S2: Determine whether the bridge arm current control permission conditions are met; If not satisfied, the bridge arm heat accumulation value is set to 0; If satisfied, proceed to step S3; S3: Obtain the average current of the power cabinet and determine whether the current bridge arm current is greater than the average current of the power cabinet; If it is greater than, the bridge arm thermal accumulation value accumulation operation is performed to obtain a new bridge arm thermal accumulation value; If it is less than, the bridge arm heat accumulation value subtraction operation is performed to obtain a new bridge arm heat accumulation value; S4: Execute control according to the current bridge arm heat accumulation value: If the current bridge arm thermal accumulation value is greater than 1, the bridge arm current control signal is triggered; If the current bridge arm thermal accumulation value is less than 0, the bridge arm current control signal is triggered to reset.

[0006] Furthermore, in step S3, the operation of accumulating the thermal cumulative value of the bridge arm is specifically to add the heating step length to the current bridge arm cumulative value.

[0007] Furthermore, the temperature rise step is bridge arm current / power cabinet average current × 10 -6 .

[0008] Furthermore, in step S3, the bridge arm heat accumulation value is subtracted by subtracting the cooling step length from the current bridge arm accumulation value.

[0009] Furthermore, the cooling step is bridge arm current / power cabinet average current × 10 -6 × cooling coefficient, wherein the cooling coefficient∈(0,1].

[0010] Furthermore, in step S4, when the bridge arm current control signal is triggered, the following steps are executed: The trigger angle of the power cabinet corresponding to the current bridge arm is reduced by a step angle; the trigger angle of the power cabinet with the smallest bridge arm current at the same position is increased by a step angle.

[0011] Furthermore, the step angle is 0.01°.

[0012] The present invention also provides a generator excitation system power cabinet bridge arm current control device, which includes: a memory, a processor, and a generator excitation system power cabinet bridge arm current control program stored on the memory and capable of running on the processor. When the generator excitation system power cabinet bridge arm current control program is executed by the processor, the steps of the above-mentioned generator excitation system power cabinet bridge arm current control method are implemented.

[0013] The present invention also provides a storage medium, which stores a generator excitation system power cabinet bridge arm current control program. When the generator excitation system power cabinet bridge arm current control program is executed by a processor, the steps of the above-mentioned generator excitation system power cabinet bridge arm current control method are implemented.

[0014] The beneficial effects of the present invention are as follows: The present invention monitors the current of each bridge arm of the power cabinet of the excitation system in real time. When the current of a certain bridge arm is greater than the average output current of the power cabinet, thermal accumulation calculation is performed on the bridge arm current. When the thermal accumulation value of the bridge arm is greater than 1, the bridge arm current control signal is activated, and the output current of the power cabinet where the bridge arm is located is reduced to achieve the purpose of reducing the bridge arm current. When the bridge arm current begins to decrease to the average current of the power cabinet, the bridge arm thermal accumulation value begins to decrease. When the bridge arm thermal accumulation value is less than 0, the bridge arm current control signal is reset, thereby achieving the purpose of controlling the bridge arm current of the power cabinet of the excitation system and avoiding thermal runaway of the thyristor of the power cabinet caused by excessive load of a single bridge arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic flow chart of the method of the present invention. DETAILED DESCRIPTION

[0016] The following description clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0017] In the description of the embodiments of the present invention, it should be noted that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is typically placed when in use, or the orientations or positional relationships commonly understood by those skilled in the art, or the orientations or positional relationships in which the inventive product is typically placed when in use. These are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used only to distinguish descriptions and should not be understood as indicating or implying relative importance.

[0018] In describing the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0019] Example 1 Embodiment 1 of the present invention discloses a method for controlling the current of a power cabinet bridge arm of a generator excitation system, which is applied to a generator excitation system, such as Figure 1 As shown, the details are as follows: S1: The excitation system regulator controller reads the bridge arm current value of each power cabinet from the power cabinet controller; S2: Determine whether the bridge arm current control permission conditions are met; If not, the bridge arm heat accumulation value is set to 0 and the process ends; If satisfied, proceed to step S3; S3: Obtain the average current of the power cabinet and determine whether the current bridge arm current is greater than the average current of the power cabinet; If it is greater than, the bridge arm thermal accumulation value accumulation operation is performed to obtain a new bridge arm thermal accumulation value; As a preferred embodiment, the bridge arm heat accumulation value accumulation operation is specifically to accumulate the heating step length to the current bridge arm accumulation value, and use the result of the accumulation operation as the new bridge arm heat accumulation value; The temperature rise step is bridge arm current / power cabinet average current × 10 -6 .

[0020] If it is less than, the bridge arm heat accumulation value subtraction operation is performed to obtain a new bridge arm heat accumulation value; As a preferred embodiment, the bridge arm heat accumulation value subtraction operation is specifically to subtract the cooling step length from the current bridge arm accumulation value, and use the result of the subtraction operation as the new bridge arm heat accumulation value; The cooling step is bridge arm current / power cabinet average current × 10 -6 × cooling coefficient, wherein the cooling coefficient∈(0,1].

[0021] S4: Execute control according to the current bridge arm heat accumulation value: If the current bridge arm thermal accumulation value is greater than 1, the bridge arm current control signal action is triggered and the following is executed: The trigger angle of the power cabinet corresponding to the current bridge arm is reduced by 0.01°; the trigger angle of the power cabinet with the smallest bridge arm current in the same position is increased by 0.01°.

[0022] If the current bridge arm thermal accumulation value is less than 0, the bridge arm current control signal is triggered to reset; Specifically, if the current bridge arm heat accumulation value is less than or equal to 1 and greater than or equal to 0, the process ends.

[0023] Example 2 Embodiment 2 of the present invention discloses a device for controlling the bridge arm current of a power cabinet in a generator excitation system. The device may be a user equipment (UE), such as a mobile phone, smart phone, laptop computer, digital broadcast receiver, personal digital assistant (PDA), tablet computer (PAD), handheld device, vehicle-mounted device, wearable device, computing device, or other processing device connected to a wireless modem, or a mobile station (MS), for executing a method for controlling the bridge arm current of a power cabinet in a generator excitation system. The device may be referred to as a user terminal, portable terminal, desktop terminal, or the like.

[0024] Typically, the device includes: at least one processor, a memory, and a generator excitation system power cabinet bridge arm current control program stored on the memory and runnable on the processor, wherein the generator excitation system power cabinet bridge arm current control program is configured to implement the steps of the generator excitation system power cabinet bridge arm current control method as described in Example 1.

[0025] The processor may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor may be implemented in at least one of the following hardware forms: a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), or a PLA (Programmable Logic Array). The processor may also include a main processor and a coprocessor. The main processor is a processor used to process data in the awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed on the display screen. The processor may also include an AI (Artificial Intelligence) processor, which is used to handle computational operations related to the generator excitation system power cabinet bridge arm current control program, allowing the generator excitation system power cabinet bridge arm current control method to be autonomously trained and learned, improving efficiency and accuracy.

[0026] The memory may include one or more computer-readable storage media, which may be non-transitory. The memory may also include high-speed random access memory and non-volatile memory, such as one or more magnetic disk storage devices or flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory is used to store at least one instruction, which is executed by the processor to implement the generator excitation system power cabinet bridge arm current control method described in Example 1.

[0027] In some embodiments, the terminal may optionally include a communication interface and at least one peripheral device. The processor, memory, and communication interface may be connected via a bus or signal lines. Each peripheral device may be connected to the communication interface via a bus, signal lines, or circuit boards. Specifically, the peripheral device may include at least one of a radio frequency circuit, a display screen, and a power supply.

[0028] The communication interface can be used to connect at least one I / O (Input / Output)-related peripheral device to the processor and memory. The communication interface is used to receive movement trajectories and other data of multiple mobile terminals uploaded by users through the peripheral device. In some embodiments, the processor, memory, and communication interface are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor, memory, and communication interface can be implemented on separate chips or circuit boards, which is not limited in this embodiment.

[0029] The radio frequency circuit is used to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuit communicates with communication networks and other communication devices via electromagnetic signals, thereby obtaining the movement trajectories and other data of multiple mobile terminals. The radio frequency circuit converts electrical signals into electromagnetic signals for transmission, or converts received electromagnetic signals into electrical signals. Optionally, the radio frequency circuit includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a user identity module card, etc. The radio frequency circuit can communicate with other terminals via at least one wireless communication protocol. Such wireless communication protocols include, but are not limited to, metropolitan area networks, various generations of mobile communication networks (2G, 3G, 4G, and 5G), wireless local area networks, and / or WiFi (Wireless Fidelity) networks. In some embodiments, the radio frequency circuit may also include circuits related to NFC (Near Field Communication), which is not limited in this embodiment.

[0030] The display screen is used to display the UI (User Interface). The UI may include graphics, text, icons, videos and any combination thereof. When the display screen is a touch screen, the display screen also has the ability to collect touch signals on the surface of the display screen or above the surface. The touch signal can be input into the processor as a control signal for processing. At this time, the display screen can also be used to provide virtual buttons and / or virtual keyboards, also known as soft buttons and / or soft keyboards. In some embodiments, the display screen can be one, the front panel of the electronic device; in other embodiments, the display screen can be at least two, respectively arranged on different surfaces of the electronic device or in a folding design; in still other embodiments, the display screen can be a flexible display screen, arranged on a curved surface or a folding surface of the electronic device. Even the display screen can be set to a non-rectangular irregular shape, that is, a special-shaped screen. The display screen can be made of materials such as LCD (Liquid Crystal Display) and OLED (Organic Light-Emitting Diode).

[0031] A power source is used to power various components in electronic devices. This power source can be AC, DC, a disposable battery, or a rechargeable battery. If the power source includes a rechargeable battery, it can support wired or wireless charging. It can also support fast charging technology.

[0032] Example 3 Embodiment 3 of the present invention discloses a storage medium, which is a readable storage medium. A computer program is stored on the readable storage medium. When the computer program is executed by a processor, the steps of the generator excitation system power cabinet bridge arm current control method of the above-mentioned embodiment 1 are implemented.

[0033] The readable storage medium may specifically be any readable storage medium that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0034] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A method for controlling the current of a power cabinet bridge arm of a generator excitation system, characterized in that: Applied to the generator excitation system, the specific technical solutions are as follows: S1: Read the bridge arm current value of each power cabinet; S2: Determine whether the bridge arm current control permission conditions are met; If not satisfied, the bridge arm heat accumulation value is set to 0; If satisfied, proceed to step S3; S3: Obtain the average current of the power cabinet and determine whether the current bridge arm current is greater than the average current of the power cabinet; If it is greater than, the bridge arm thermal accumulation value accumulation operation is performed to obtain a new bridge arm thermal accumulation value; If it is less than, the bridge arm heat accumulation value subtraction operation is performed to obtain a new bridge arm heat accumulation value; S4: Execute control according to the current bridge arm heat accumulation value: If the current bridge arm heat accumulation value is greater than 1, the bridge arm current control signal is triggered; If the current bridge arm thermal accumulation value is less than 0, the bridge arm current control signal is triggered to reset.

2. The generator excitation system power cabinet bridge arm current control method according to claim 1, characterized in that: In step S3, the bridge arm thermal cumulative value accumulation operation is specifically to accumulate the heating step length to the current bridge arm cumulative value.

3. The generator excitation system power cabinet bridge arm current control method according to claim 2, characterized in that: The heating step is bridge arm current / power cabinet average current × 10 -6 .

4. The generator excitation system power cabinet bridge arm current control method according to claim 1, characterized in that: In step S3, the bridge arm heat accumulation value is subtracted by subtracting the cooling step length from the current bridge arm accumulation value.

5. The generator excitation system power cabinet bridge arm current control method according to claim 4, characterized in that: The cooling step is bridge arm current / power cabinet average current × 10 -6 × cooling coefficient, wherein the cooling coefficient∈(0,1].

6. The generator excitation system power cabinet bridge arm current control method according to claim 1, characterized in that: In step S4, when the bridge arm current control signal is triggered, the following steps are executed: The trigger angle of the power cabinet corresponding to the current bridge arm is reduced by a step angle; the trigger angle of the power cabinet with the smallest bridge arm current at the same position is increased by a step angle.

7. The generator excitation system power cabinet bridge arm current control method according to claim 6, characterized in that: The step angle is 0.01°.

8. A generator excitation system power cabinet bridge arm current control device, characterized in that: The generator excitation system power cabinet bridge arm current control device includes: a memory, a processor, and a generator excitation system power cabinet bridge arm current control program stored in the memory and runnable on the processor. When the generator excitation system power cabinet bridge arm current control program is executed by the processor, the steps of the generator excitation system power cabinet bridge arm current control method described in any one of claims 1-7 are implemented.

9. A storage medium, characterized in that: The storage medium stores a generator excitation system power cabinet bridge arm current control program, and when the generator excitation system power cabinet bridge arm current control program is executed by the processor, the steps of the generator excitation system power cabinet bridge arm current control method described in any one of claims 1-7 are implemented.

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