All-digital alternating current voltage regulating device

Abstract

The invention provides an all-digital alternating current voltage regulating device, and belongs to the technical field of industrial automation and control. The converter is used for adjusting and controlling exciting current of a motor and controlling a three-phase winding type motor with a slip ring, is a completely controllable converter, and utilizes a compact converter technology. The voltage regulating device is used for regulating and controlling the exciting current of the motor, and can also be used for controlling a three-phase wound-rotor motor which is provided with a slip ring and is used for lifting a driver. Control data is communicated with digital equipment through the Ethernet so as to meet the requirements of compact structure, high communication rate, reliable operation and space saving. The service and maintenance of the all-digital AC voltage regulating device can be carried out through a remote network.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial automation and control, and in particular relates to a fully digital AC voltage regulating device. Background Art

[0002] With the continuous advancement of industrial automation technology, the requirements for motor control systems are becoming increasingly stringent, particularly in terms of speed regulation, efficiency, stability, and control accuracy. Traditional voltage regulators often use analog control methods, which can lead to slow response, low control accuracy, and complex maintenance. Furthermore, traditional voltage regulators typically lack Ethernet network communication capabilities, making remote monitoring and data exchange difficult. This is particularly inadequate in modern industrial production.

[0003] After searching, it was found that the authorization announcement number "CN110661460B" discloses a digital voltage regulation device for wide-frequency AC generators for aviation. The three-phase AC power generated by the permanent magnet motor is converted into DC power through full-bridge rectification, which is used to provide power for the voltage regulator controller and provide excitation current. The excitation current passes through a fast excitation circuit and is redundantly controlled by dual DSPs for voltage regulation, converting it into an adaptive excitation current. The excitation current is used to generate an excitation magnetic field for the excitation coil of the exciter. The rotor winding of the exciter rotates to generate current, which is converted into DC power through a rotating rectifier to generate a magnetic field for the main generator, which is used to generate three-phase AC power. This patent adopts a dual DSP redundant backup design with complementary advantages to complete the voltage regulation and protection functions. It has the advantages of high voltage regulation accuracy, good dynamic characteristics, and stable and reliable performance. It is suitable for aviation wide-frequency AC power supply systems.

[0004] However, existing fully digital AC voltage regulators can only convert three-phase AC voltage and current into two-wire DC voltage and current. Furthermore, most existing voltage regulators operate in a single mode, lacking the flexibility to adapt to varying load conditions, limiting their application scenarios. Summary of the Invention

[0005] The purpose of the present invention is to provide a fully digital AC voltage regulator, aiming to solve the problem that existing fully digital AC voltage regulators can only be used to convert AC three-phase voltage and current into two-line DC voltage and current. In addition, most existing voltage regulators can only operate in a single mode and cannot flexibly respond to different load conditions, which limits their application scenarios.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A fully digital AC voltage regulator can provide controllable excitation current for the motor rotor. The fully digital AC voltage regulator includes a main circuit power supply and a main control board. The main circuit power supply is connected in parallel with a converter. The converter can convert the input three-phase AC voltage into a controllable three-phase AC voltage and current, and can regulate and control the motor excitation current, as well as the speed control of the AC motor with a pole-slip ring winding.

[0007] As a preferred solution of the present invention, the all-digital AC voltage regulating device is provided with an Ethernet communication module, and the Ethernet communication module is used to communicate with digital equipment.

[0008] As a preferred solution of the present invention, the Ethernet communication module of the all-digital AC voltage regulator is inserted into the main control board. The Ethernet communication module has a four-port interface to access the subnet, so that it has Ethernet function. The four-port interface supports connection with other devices to form a ring network. The Ethernet communication module supports real-time communication and isochronous real-time communication to meet the real-time and deterministic requirements of signal processing in industrial networks. The Ethernet communication module can coexist with other devices with the same standard protocol in the same network to ensure network compatibility.

[0009] As a preferred solution of the present invention, the converter of the fully digital AC voltage regulator device achieves AC voltage regulation by changing the triggering sequence and conduction angle of the thyristor. The converter is controlled by the thyristor gate circuit trigger unit. Through the line-synchronized trigger pulse, the control electronic unit is separated from the main power supply circuit through the trigger unit, and the operating status is displayed on the device through a dedicated basic operation panel.

[0010] As a preferred solution of the present invention, the converter of the fully digital AC voltage regulator can realize four-quadrant operation and has an automatic commutation function, and can realize reverse braking and driving functions under different load conditions. In the automatic commutation stage, the phase sequence on the converter output is electrically reversed. According to the load conditions, the function of the converter can be switched between reverse braking mode and driving mode. The circuit design to realize this function includes two additional thyristor modules on the parallel branch to promote torque conversion.

[0011] As a preferred solution of the present invention, the AC voltage regulating device main control board of the fully digital AC voltage regulating device can utilize stator phase angle control in the application of pole-slip ring AC motors to achieve a high level of control power and improve speed regulation performance. The stator phase angle control achieves precise speed regulation and torque control by adjusting the phase angle of the motor. The control method improves the response speed and stability of the system and is suitable for high-precision control applications of pole-slip ring AC motors.

[0012] As a preferred solution of the present invention, the main control board of the AC voltage regulating device is suitable for the motor excitation system and the AC motor speed control system with a pole-slip ring, which can improve the performance of the existing system. For the motor, it provides a stable excitation current to ensure the efficient operation of the motor. For the AC motor with a pole-slip ring, it realizes smooth speed regulation and torque control, and improves the dynamic response and energy efficiency of the system.

[0013] As a preferred solution of the present invention, the main control board of the all-digital AC voltage regulator is placed on one side, supporting multiple combinations to adapt to installation environments of different sizes and layouts.

[0014] As a preferred solution of the present invention, the main control board of the AC voltage regulator is compatible with the lifting components and interfaces, which facilitates integration into the existing industrial automation system and improves the overall performance of the system. Compared with the existing technology, the beneficial effects of the present invention are: 1. By integrating advanced voltage regulation technology and efficient communication modules, precise control of motor excitation and the AC motor lifting system with pole-slip winding is achieved, which can significantly improve the operating efficiency and stability of the motor. Through the fine adjustment of the motor excitation current and the application of stator phase angle control technology, the motor can maintain the optimal working state under various working conditions, which not only improves the system's response speed and speed regulation accuracy, but also extends the service life of the equipment. The four-quadrant operation capability and automatic phase change function ensure smooth switching between the equipment's reverse braking mode and drive mode, greatly improving the system's dynamic response capability.

[0015] 2. It has powerful network communication capabilities. Through the built-in Ethernet communication module, it can easily achieve seamless docking with existing industrial automation systems, which not only simplifies the system integration process, but also enhances the system's scalability and maintenance convenience, greatly improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a topological diagram of the main circuit thyristor and trigger interface diagram of the all-digital AC voltage regulator of the present invention; Figure 2 This is a wiring diagram of the device in the present invention; Figure 3 This is the main diagram of the Ethernet communication board of the present invention; Figure 4 This is a plan view of the all-digital AC voltage regulator for industrial Ethernet invented by the present invention.

[0017] 1, 2 Main circuit power supply 3 Control power supply 4, 5 Converter 6 Main control board CDU 7 Communication board assembly 8 Fully digital AC voltage regulator 9 Ethernet communication module DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0019] See also Figures 1-4 , the present invention provides the following technical solutions: A fully digital AC voltage regulating device 8 can provide a controllable excitation current for the motor rotor. The fully digital AC voltage regulating device 8 includes converters 4 and 5 connected in parallel with main circuit power supplies 1 and 2, and a main control board 6. Converters 4 and 5 are used to convert the input three-phase AC voltage into controllable three-phase AC voltage and current, which can realize the regulation and control of the motor excitation current. The fully digital AC voltage regulating device is provided with an Ethernet communication module 9, which is used to communicate with digital equipment.

[0020] In this embodiment, the motor excitation current is adjusted by three pairs of anti-parallel controllable voltage regulators using rotor phase angle control. During this process, the motor excitation output power frequency does not change and is the same as the relevant power supply frequency.

[0021] Converters 4 and 5 are responsible for regulating and controlling the motor's excitation current to ensure optimal motor operation. They convert the input standard three-phase AC voltage into variable three-phase voltage and current that can be adjusted as needed to accommodate load requirements under different operating conditions. The main control board 6, serving as the system's core control unit, manages the entire device's operational processes, including starting, stopping, and fault detection.

[0022] The motor's excitation current is regulated by controlling the rotor phase angle, achieving fine adjustment using three pairs of anti-parallel controllable voltage regulators. This process does not alter the frequency of the motor's excitation output power, maintaining consistency and stability with the power grid. This allows for precise control of motor performance and improved energy efficiency in large-scale machinery in industries such as metallurgy, petrochemicals, and papermaking. By employing advanced control strategies and techniques, this device not only significantly improves system response speed and stability, but also effectively reduces energy consumption and extends equipment life.

[0023] For details, please refer to Figures 1-4Inverters 4 and 5 adjust the AC voltage by changing the triggering sequence and conduction angle of the thyristors. The change in the triggering sequence is dynamically calculated and adjusted in real time by a software algorithm. The control of the thyristor AC voltage regulator is achieved by the thyristor gate circuit trigger unit. Through the line-synchronized trigger pulse, the control electronic unit is separated from the main power circuit by the trigger unit.

[0024] In this embodiment, converters 4 and 5 regulate the AC voltage by changing the triggering sequence and conduction angle of the thyristors (SCRs). Adjusting the timing of the SCR conduction within each cycle controls the output voltage amplitude. The triggering sequence is dynamically calculated and adjusted in real time by a software algorithm. The SCRs are controlled by a trigger unit in the SCR gate circuit. The trigger unit receives instructions from the control electronics unit and generates trigger pulses at the appropriate time to turn on the SCRs. These trigger pulses are synchronized with the main power supply circuit, ensuring control accuracy and stability. The control electronics unit is separated from the main power supply circuit by the trigger unit. This design not only improves system safety but also reduces electromagnetic interference, ensuring the purity of the control signal.

[0025] For details, please refer to Figures 1-4 The main control board 6 is placed on one side of the unit and supports multiple combinations to adapt to installation environments of different sizes and layouts.

[0026] In this embodiment, the main control board 6 is placed on one side of the unit. This design not only facilitates heat dissipation but also facilitates connection and wiring with other components. The main control board 6 is secured within the unit using standard rails or brackets, ensuring stability. This placement allows for a more rational arrangement of other components, improving overall space utilization. The main control board 6 connects to components such as the converters 4 and 5 and the Ethernet communication module 9 via standard interfaces, forming a complete voltage regulator. The flexible placement and modular structure of the main control board 6 adapts to installation environments of varying sizes and layouts. This design not only improves system space utilization but also facilitates installation and maintenance.

[0027] For details, please refer to Figures 1-4 The fully digital AC voltage regulating device 8 is provided with an Ethernet communication module 9, which is used to communicate with digital equipment.

[0028] In this embodiment: the Ethernet communication module 9 is inserted into the main control board 6. The Ethernet communication module 9 has a four-port interface that accesses the subnet, giving it Ethernet function. The four-port interface supports connection with other devices to form a subnet. The Ethernet communication module 9 supports real-time communication and isochronous real-time communication to meet the real-time and deterministic requirements of signal processing in industrial networks. The Ethernet communication module 9 supports coexistence with other standard protocols in the same network to ensure network compatibility.

[0029] For details, please refer to Figures 1-4 The AC voltage regulating device 8 is compatible with standard lifting components and interfaces, making it easy to integrate into existing industrial automation systems and improve the overall performance of the system.

[0030] In this embodiment: the Ethernet communication module 9 is inserted into the main control board 6, so that the module can be tightly integrated into the entire control system, and it also facilitates subsequent maintenance and upgrades. The Ethernet communication module 9 is equipped with a four-port Ethernet interface. These four ports all support a data transmission rate of 10 / 100Mbps and can be connected to a subnet, so that the voltage regulating device has complete Ethernet communication functions. The four ports not only support connections with other PROFINET devices, but also can build complex network topologies, such as ring or star networks, which improves the flexibility of the system. The Ethernet communication module 9 supports real-time communication (IRT) mode, which ensures low latency and high reliability of signal processing in industrial environments. High reliability requirements, in addition, it also supports isochronous real-time communication, and can achieve accurate time synchronization in the network, which is especially important for application scenarios that require highly coordinated control. The Ethernet communication module 9 not only supports the PROFINET protocol, but can also coexist with other standard protocols in the same network, enhancing the compatibility of the system. By integrating the Ethernet communication module 9 into the fully digital AC voltage regulator, users can easily connect the device to the existing industrial network to achieve remote monitoring and parameter adjustment. In large manufacturing workshops, multiple voltage regulators distributed in different locations can be centrally managed and optimized through the central control system, thereby improving production efficiency while reducing operation and maintenance costs.

[0031] In this embodiment: Through the built-in Ethernet communication module 9, the fully digital AC voltage regulating device 8 can communicate with industrial equipment that supports the PROFINET protocol at high speed and in real time. It supports real-time communication and isochronous real-time communication to ensure real-time signal processing, and is applicable to a variety of industrial equipment and control systems. Through the PROFINET network, users can easily integrate the fully digital AC voltage regulating device 8 into the existing industrial Ethernet network, and support the Profinet protocol based on EtherNet / IP, which is an open industrial network protocol suitable for complex industrial automation systems. Through Profinet, users can achieve seamless integration with other devices that support the protocol. The fully digital AC voltage regulating device 8 achieves seamless integration with existing industrial automation systems by supporting standard industrial interfaces and providing multiple physical interfaces. This design not only improves the overall performance of the system, but also provides convenience for users' system construction and maintenance. Example

[0032] See also Figures 1-4 , the present invention provides the following technical solutions: A fully digital AC voltage regulating device 8 can provide controllable voltage and current for a slip-ring motor. The fully digital AC voltage regulating device 8 includes converters 4 and 5 connected in parallel with main circuit power supplies 1 and 2, and a main control board 6. Converters 4 and 5 are used to convert the input three-phase AC voltage into controllable three-phase AC voltage and current, which are used for speed regulation of a three-phase winding gear lifting motor with a slip-ring rotor. The fully digital AC voltage regulating device 8 is provided with an Ethernet communication module 9, which is used to communicate with digital equipment.

[0033] In applications for speed control of AC motors with extremely slippery windings, two additional thyristor modules in the parallel branch of the controllable current section drive torque conversion, thereby driving four-quadrant operation of the converter 4Q. During the automatic commutation phase, the phase sequence on the outputs of converters 4 and 5 is electrically reversed. Depending on the load conditions, converters 4 and 5 function in reverse braking mode, a very powerful yet extremely gentle drive cycle, eliminating the need for conventional stator reversing contactors. For details, please refer to Figures 1-4 Inverters 4 and 5 can achieve four-quadrant operation and have automatic commutation function, which can realize reverse braking and driving functions under different load conditions. During the automatic commutation stage, the phase sequence on the output of inverters 4 and 5 is electrically reversed. Depending on the load conditions, the function of the inverter can be switched between reverse braking mode and driving mode. The circuit design to realize this function includes two additional thyristor modules in the parallel branch to promote torque conversion.

[0034] In this embodiment, four-quadrant operation refers to the ability of converters 4 and 5 to operate in four operating modes: forward motoring (driving), forward power generation (regenerative braking), reverse motoring (reverse driving), and reverse power generation (reverse regenerative braking). These modes cover all motor operating states under varying load conditions. Converters 4 and 5 utilize advanced power electronics technology and control algorithms to achieve four-quadrant operation under varying load conditions. During the automatic commutation phase, the phase sequence at the outputs of converters 4 and 5 is electrically reversed, allowing converters 4 and 5 to switch between reverse braking mode and drive mode. In reverse braking mode, converters 4 and 5 generate reverse torque by altering the phase sequence, achieving rapid braking. In drive mode, converters 4 and 5 provide forward torque, enabling normal motor operation. Converters 4 and 5 incorporate two additional thyristor modules in the parallel branches. These two modules work together in different operating modes, precisely controlling the on and off states of the thyristors to achieve smooth torque conversion. The control logic is implemented by software algorithms on the main control board. These algorithms dynamically adjust the thyristor triggering and phase sequence based on real-time monitoring of load conditions and system status, ensuring that converters 4 and 5 always operate optimally. Converters 4 and 5 significantly improve the system's response speed and dynamic performance, reducing mechanical shock and energy loss. Advanced circuit design and control algorithms enable four-quadrant operation and automatic commutation. This design not only enhances system flexibility but also dynamically adjusts operating modes based on load conditions, ensuring efficient and stable motor operation under various operating conditions.

[0035] For details, please refer to Figures 1-4 The fully digital AC voltage regulator 8 can also use stator phase angle control to achieve a high level of control power and improve speed regulation performance. Stator phase angle control achieves precise speed and torque control by adjusting the phase angle of the motor. The control method improves the response speed and stability of the system and is suitable for high-precision control applications.

[0036] In this embodiment, stator phase angle control achieves precise control of the motor's speed and torque by adjusting the phase angle of the motor's stator windings. The primary goal of stator phase angle control is to achieve precise speed and torque control, improving the system's responsiveness and stability. The system uses sensors to monitor the motor's operating status in real time, including parameters such as speed, torque, and current. This data is transmitted to the main control board 6 for real-time adjustment of the stator phase angle. The main control board 6 dynamically adjusts the stator phase angle based on the real-time monitoring data and a pre-set control algorithm. These algorithms typically include PID control and fuzzy control to ensure optimal system performance under various operating conditions. Precise adjustment of the stator phase angle enables precise control of even small speed changes, improving the system's speed regulation accuracy and responsiveness. Furthermore, stator phase angle control effectively suppresses torque fluctuations and improves system stability. Stator phase angle control works in conjunction with converters 4 and 5 to achieve precise control of the motor. The voltage regulator is responsible for regulating the AC voltage, while the stator phase angle control adjusts the phase angle. Combining these two functions enables more efficient energy conversion and more precise control. Dynamically adjusting the output voltage and current based on changes in the stator phase angle ensures stable motor operation under various operating conditions. Adjusting the stator phase angle enables precise control of the motor's speed and torque, improving system response speed. This is particularly useful in industries such as metallurgy, petrochemicals, and papermaking, where motors are often used to drive large machinery. The AC voltage regulator achieves smooth speed and torque control for AC motors with slip-coated windings by precisely regulating the generator speed and varying the triggering sequence of the thyristors and the stator phase angle. Converters 4 and 5 support four-quadrant operation, enabling both reverse braking and drive functions under varying load conditions. This ensures stable motor performance during forward and reverse rotation, as well as acceleration and deceleration. During the automatic commutation phase, the phase sequence at the converter output is electrically reversed. Depending on the load, the converter can switch between reverse braking mode and drive mode, ensuring efficient motor operation under various operating conditions.

[0037] For details, please refer to Figures 1-4 The main control board 6 is placed on one side of the unit and supports multiple combinations to adapt to installation environments of different sizes and layouts.

[0038] In this embodiment, the main control board 6 is placed on one side of the unit. This design not only facilitates heat dissipation but also facilitates connection and wiring with other components. The main control board 6 is secured within the unit using standard rails or brackets, ensuring stability. This placement allows for more rational arrangement of other components, improving overall space utilization. The main control board 6 connects to components such as the converters 4 and 5 and the Ethernet communication module 9 via standard interfaces, forming a complete voltage regulator. The flexible design and modular structure of the main control board 6 allow it to be positioned and assembled in various installation environments. This design not only improves system space utilization but also facilitates installation and maintenance.

[0039] For details, please refer to Figures 1-4 The fully digital AC voltage regulating device 8 is provided with an Ethernet communication module 9, which is used to communicate with digital equipment.

[0040] In this embodiment: the Ethernet communication module 9 is inserted into the option slot of the main control board 6. The Ethernet communication module 9 has a four-port interface for accessing the subnet, giving it Ethernet function. The four-port interface supports connection with other devices to form a subnet. The Ethernet communication module 9 supports real-time communication and isochronous real-time communication to meet the real-time and deterministic requirements of signal processing in industrial networks. The industrial Ethernet communication module supports coexistence with other standard protocols in the same network to ensure network compatibility.

[0041] For details, please refer to Figures 1-4 The fully digital AC voltage regulator 8 is compatible with standard lifting components and interfaces, making it easy to integrate into existing industrial automation systems and improve the overall performance of the system.

[0042] In this embodiment: Through the built-in Ethernet communication module 9, the fully digital AC voltage regulating device 8 can communicate with industrial equipment that supports the PROFINET protocol at high speed and in real time. It supports real-time communication and isochronous real-time communication to ensure real-time signal processing, and is applicable to a variety of industrial equipment and control systems. Through the PROFINET network, users can easily integrate the fully digital AC voltage regulating device 8 into the existing industrial Ethernet network, and support the Profinet protocol based on EtherNet / IP, which is an open industrial network protocol suitable for complex industrial automation systems. Through Profinet, users can achieve seamless integration with other devices that support the protocol. The fully digital AC voltage regulating device 8 achieves seamless integration with existing industrial automation systems by supporting standard industrial interfaces and providing multiple physical interfaces. This design not only improves the overall performance of the system, but also provides convenience for users' system construction and maintenance.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention. The working principle and usage process of the present invention are as follows: In synchronous motor excitation control applications, the main control board adjusts the output phase angle according to a preset control algorithm to control the motor's excitation current. By controlling the conduction angle of three pairs of anti-parallel thyristors, the excitation current is regulated to ensure efficient motor operation. During this process, the motor excitation output power frequency remains constant, matching the mains frequency. The compact converter accepts a standard three-phase AC voltage input and, by controlling the firing sequence of the thyristors, converts the input voltage into a controllable three-phase voltage and current to meet varying load requirements.

[0044] In speed regulation applications for three-phase wound-gear hoist motors with slip-ring rotors, two additional thyristor modules in parallel branches of the controllable current section are used to drive torque conversion, enabling four-quadrant operation of the converter. During the automatic commutation phase, the phase sequence at the converter output is electrically reversed. Depending on the load conditions, the converter can switch between reverse braking mode and drive mode, ensuring efficient motor operation under various operating conditions.

[0045] For the network interface, collected data is transmitted to the main control board via an industrial Ethernet communication module, enabling precise control of motor excitation and speed regulation for AC motors with slip rings. The main workflow includes initialization and configuration, excitation current regulation, converter control, speed control, system monitoring and adjustment, and user interaction. The communication interface enhances the device's digitalization and intelligence, enabling convenient remote control and diagnostic capabilities.

Claims

1. A fully digital AC voltage regulating device (8) capable of providing a controllable excitation current for a motor rotor, the fully digital AC voltage regulating device (8) comprising a main circuit power supply (1, 2) and a main control board (6), characterized in that: The main circuit power supply (1, 2) is connected in parallel with a converter (4, 5), which is capable of converting an input three-phase AC voltage into a controllable three-phase AC voltage and current, and can regulate and control the excitation current of the motor, as well as speed control of a pole-slip ring AC motor.

2. The all-digital AC voltage regulator (8) according to claim 1, characterized in that: The fully digital AC voltage regulating device (8) is provided with an Ethernet communication module (9), and the Ethernet communication module (9) is used to communicate with digital equipment.

3. The all-digital AC voltage regulator according to claim 2, characterized in that: The Ethernet communication module (9) is inserted into the main control board (6). The Ethernet communication module (9) has a four-port interface for accessing the subnet, so that it has Ethernet function. The four-port interface supports connection with other devices to form a ring network. The Ethernet communication module (9) supports real-time communication and isochronous real-time communication to meet the real-time and deterministic requirements of signal processing in the industrial network. The Ethernet communication module (9) can coexist with other protocols of the same standard in the same network to ensure network compatibility.

4. The all-digital AC voltage regulator according to claim 1, characterized in that: The converter (4, 5) adjusts the AC voltage by changing the triggering sequence and conduction angle of the thyristor. The converter (4, 5) is controlled by a thyristor gate circuit triggering unit. Through a line-synchronized triggering pulse, the control electronic unit is separated from the main power supply circuit through the triggering unit.

5. The all-digital AC voltage regulator (8) according to claim 1, characterized in that: The inverter (4, 5) can realize four-quadrant operation and has an automatic phase-changing function, and can realize reverse-phase braking and driving functions under different load conditions. In the automatic phase-changing stage, the phase sequence on the output of the inverter (4, 5) is electrically reversed. According to the load conditions, the function of the inverter can be switched between reverse-phase braking mode and driving mode. The circuit design to realize this function includes two additional thyristor modules on the parallel branch to promote torque conversion.

6. The all-digital AC voltage regulator (8) according to claim 1, characterized in that: The main control board (6) can realize high-level control power and improve speed regulation performance by using stator phase angle control in the application of pole slip-ring AC motor. The stator phase angle control realizes precise speed regulation and torque control by adjusting the phase angle of the motor. The control method improves the response speed and stability of the system and is suitable for high-precision control applications of pole slip-ring AC motor.

7. The all-digital AC voltage regulator (8) according to claim 6, characterized in that: The main control board (6) is suitable for a motor excitation system and a pole-slip ring AC motor speed regulation system, and can improve the performance of the system, provide a stable excitation current for the motor, and ensure the efficient operation of the motor; for the pole-slip ring AC motor, it can achieve smooth speed regulation and torque control, and improve the dynamic response and energy efficiency of the system.

8. The all-digital AC voltage regulator (8) according to claim 7, characterized in that: The main control board (6) is placed on one side of the unit and supports multiple combinations to adapt to installation environments of different sizes and layouts.

9. The all-digital AC voltage regulator according to claim 8, characterized in that: The main control board (6) can improve components and compatibility interfaces, making it easier to integrate into an existing industrial automation system, thereby improving the overall performance of the system.

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