All-digital alternating current voltage regulating device

Abstract

The utility model 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 utility model belongs to the industrial automation and control technical field, especially relates to full -digital alternating voltage regulating device. BACKGROUND

[0002] With the continuous progress of industrial automation technology, the requirement of motor control system is also higher and higher, especially in speed regulation, efficiency, stability and control precision etc. The traditional voltage regulating device often adopts analog control mode, and has problems such as slow response speed, low control precision and complex maintenance. In addition, the traditional voltage regulating device usually does not have the ability of Ethernet communication, and it is difficult to realize remote monitoring and data exchange, which is particularly insufficient in modern industrial production.

[0003] After searching, it is found that the authorized announcement number for CN110661460B discloses a digital voltage regulating device of a wide frequency conversion alternating current generator for aviation. The three-phase alternating current emitted by the permanent magnet machine is converted into direct current through full-bridge rectification, which is used to provide power supply for the voltage regulator and provide excitation current. The excitation current is converted by the double-DSP redundant voltage regulating control, and the excitation current is used to generate the excitation magnetic field for the excitation coil of the excitation machine. The rotor winding of the excitation machine rotates to generate current, which is converted into direct current through the rotating rectifier to generate a magnetic field for the main generator. The main generator is used to emit three-phase alternating current. The patent adopts double-DSP redundant backup design, which has the advantages of complementary and collaborative completion of voltage regulation and protection function, high voltage regulation precision, good dynamic characteristics and stable reliability, and is suitable for aviation wide frequency conversion alternating current power supply system.

[0004] However, the full-digital alternating voltage regulating device already existing in the market can only be used to convert three-phase alternating voltage and current into two-wire direct current voltage and current. In addition, most of the existing voltage regulating devices can only work in a single mode, and cannot flexibly cope with different load conditions, which limits its application scenarios. SUMMARY

[0005] The purpose of the present application is to provide a full-digital alternating voltage regulating device, which aims to solve the problem that the existing full-digital alternating voltage regulating device can only be used to convert three-phase alternating voltage and current into two-wire direct current voltage and current, in addition, most of the existing voltage regulating devices can only work in a single mode, and cannot flexibly cope with different load conditions, which limits its application scenarios.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] The application discloses a full-digital AC voltage regulating device which can provide controllable excitation current for a motor rotor, and the full-digital AC voltage regulating device comprises a main loop power supply and a main control board, and the main loop power supply is connected in parallel with a converter which can convert input three-phase AC voltage into controllable three-phase AC voltage and current, and can regulate and control motor excitation current and control the speed of a pole-slip-ring winding AC motor.

[0008] As a preferred scheme of the application, the full-digital AC voltage regulating device is provided with an Ethernet communication module which is used for communication with digital devices.

[0009] As a preferred scheme of the application, the Ethernet communication module of the full-digital AC voltage regulating device is inserted in the main control board, and the Ethernet communication module is provided with a four-port interface which is connected to a sub-network, so that the Ethernet communication module 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 synchronous real-time communication, so as to meet real-time and deterministic requirements of signal processing in an industrial network, and the Ethernet communication module can coexist with other same standard protocol devices in the same network, so as to ensure network compatibility.

[0010] As a preferred scheme of the application, the converter of the full-digital AC voltage regulating device can realize AC voltage regulation by changing the triggering sequence and conduction angle of thyristors, the control of the converter is realized by a thyristor gate circuit triggering unit, the control electronic unit is separated from the power supply main loop by a triggering pulse, and the operating state is displayed on the device by a professional basic operation panel.

[0011] As a preferred scheme of the application, the converter of the full-digital AC voltage regulating device can realize four-quadrant operation and has an automatic commutation function, can realize reverse-phase braking and driving functions under different load conditions, and in the automatic commutation stage, the phase sequence on the converter output is reversed by electricity, according to the load condition, the function of the frequency converter can be switched between the reverse-phase braking mode and the driving mode, and the circuit design for realizing the function comprises two additional thyristor modules on the parallel branch and is used for torque conversion.

[0012] As a preferred scheme of the application, the AC voltage regulating device main control board of the full-digital AC voltage regulating device can realize high-level control power by using stator phase angle control in the application of a pole-slip-ring AC motor, and improve the speed regulation performance, the stator phase angle control realizes accurate 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 application of the pole-slip-ring winding AC motor.

[0013] As a preferred scheme of the present application, the main control board of the AC voltage regulating device is applicable to motor excitation system and pole slip ring winding AC motor speed regulation system, which can improve the performance of the existing system, provides stable excitation current for the motor, ensures the efficient operation of the motor, realizes smooth speed regulation and torque control for the pole slip ring winding AC motor, and improves the dynamic response and energy efficiency of the system.

[0014] As a preferred scheme of the present application, the main control board of the full-digital AC voltage regulating device is placed on one side, supports multiple combination modes, and is suitable for installation environments of different sizes and layouts.

[0015] As a preferred scheme of the present application, the main control board of the AC voltage regulating device is compatible with the promotion element and the interface, is convenient for integration into the existing industrial automation system, and improves the overall performance of the system. Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. By integrating advanced voltage regulating technology and efficient communication modules, precise control of motor excitation and pole slip ring winding AC motor promotion system is realized, which can significantly improve the operating efficiency and stability of the motor. Through fine adjustment of the motor excitation current and application of stator phase angle control technology, the motor can maintain the optimal working state under various working conditions, not only improving the response speed and speed regulation accuracy of the system, but also prolonging the service life of the equipment, four-quadrant operation capability and automatic commutation function, ensuring smooth switching between reverse phase braking mode and driving mode, and greatly improving the dynamic response capability of the system.

[0017] 2. It has strong network communication capability, and through the built-in Ethernet communication module, it can easily realize seamless connection with the existing industrial automation system, not only simplifying the system integration process, but also enhancing the expandability and maintenance convenience of the system, greatly improving the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The full-digital AC voltage regulating device main circuit thyristor topology and trigger interface diagram of the present application;

[0019] Figure 2 The device wiring principle diagram in the present application;

[0020] Figure 3 The main diagram of the Ethernet communication board of the present application;

[0021] Figure 4 The full-digital AC voltage regulating device plan view of the industrial Ethernet of the present application.

[0022] 1,2 main circuit power supply 3 control power supply 4,5 converter 6 main control board CDU 7 communication board assembly 8 all-digital AC voltage regulating device 9 Ethernet communication module DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. EMBODIMENT

[0024] Please refer to Figures 1-4 The present application provides the following technical solutions:

[0025] An all-digital AC voltage regulating device 8 can provide a controllable excitation current for a motor rotor. The all-digital AC voltage regulating device 8 includes a main circuit power supply 1, 2, a converter 4, 5 in parallel, and a main control board 6. The converter 4, 5 is used to convert the input three-phase AC voltage into a controllable three-phase AC voltage and current, which can realize the adjustment and control of the motor excitation current. The all-digital AC voltage regulating device is provided with an Ethernet communication module 9, which is used for communication with digital devices.

[0026] In the embodiment: the motor excitation current is adjusted by using the rotor phase angle control from three pairs of anti-parallel controllable voltage regulators. In this process, the frequency of the motor excitation output power supply does not change, which is the same as the related power supply frequency.

[0027] The converter 4, 5 is responsible for adjusting and controlling the motor excitation current, ensuring that the motor operates in the optimal state. The converter 4, 5 converts the input standard three-phase AC voltage into a variable three-phase voltage and current that can be adjusted according to demand, adapting to the load demand under different working conditions. The main control board 6 serves as the core control unit of the system, managing the operation process of the entire device, including starting, stopping, fault detection, etc.

[0028] The adjustment of the motor excitation current is completed by controlling the rotor phase angle, and three pairs of anti-parallel controllable voltage regulators are used to achieve fine adjustment. This process does not change the frequency of the motor excitation output power supply, maintaining consistency and stability with the power supply grid. Precise control of motor performance and improvement of energy efficiency are achieved in applications such as large-scale mechanical equipment in the metallurgical, petrochemical, and papermaking industries. By adopting advanced control strategies and technical means, the device not only significantly improves the response speed and stability of the system, but also effectively reduces energy consumption and prolongs the service life of the equipment.

[0029] For details, please refer to Figures 1-4, the converter 4, 5 realizes the regulation of alternating voltage by changing the trigger sequence and conduction angle of thyristor, the change of trigger sequence is dynamically calculated and adjusted in real time by software algorithm, wherein the control of the thyristor AC voltage regulator is realized through the thyristor gate circuit trigger unit, through the synchronous trigger pulse of the line, the control electronic unit is separated from the main circuit of the power supply through the trigger unit.

[0030] In this embodiment: the converter 4, 5 realizes the regulation of alternating voltage by changing the trigger sequence and conduction angle of thyristor, the change of trigger sequence is dynamically calculated and adjusted in real time by software algorithm, wherein the control of the thyristor AC voltage regulator is realized through the thyristor gate circuit trigger unit, through the synchronous trigger pulse of the line, the control electronic unit is separated from the main circuit of the power supply through the trigger unit.

[0031] For details, please refer to Figures 1-4 The main control board 6 is placed on one side of the unit, supporting multiple combination modes to adapt to different sizes and layout installation environments.

[0032] 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 fixed inside the unit through standard guide rails or supports to ensure its stability, this placement design allows other components to be more reasonably arranged, improving the overall space utilization, the main control board 6 and components such as the converter 4, 5, and the Ethernet communication module 9 are connected through standard interfaces to form a complete voltage regulating device, the placement and combination mode of the main control board 6 adapt to different sizes and layout installation environments through flexible design and modular structure. This design not only improves the space utilization of the system, but also provides convenience for users' installation and maintenance.

[0033] For details, please refer to Figures 1-4 The all-digital AC voltage regulating device 8 is provided with an Ethernet communication module 9, which is used for communication with digital devices.

[0034] In this embodiment, the Ethernet communication module 9 is plugged into the main control board 6. The Ethernet communication module 9 has a four-port interface, which is connected to a subnet to make the device have 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 synchronous 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.

[0035] For details, please refer to Figures 1-4 The AC voltage regulating device 8 is compatible with standard lifting elements and interfaces, which facilitates integration into existing industrial automation systems and improves the overall performance of the system.

[0036] In this embodiment, the Ethernet communication module 9 is plugged into the main control board 6, which allows the module to be closely integrated into the entire control system and facilitates subsequent maintenance and upgrades. The Ethernet communication module 9 is equipped with a four-port Ethernet interface. The four ports support 10 / 100Mbps data transmission rate and can be connected to a subnet, which enables the device to have complete Ethernet communication function. The four ports not only support connection with other PROFINET devices, but also can build complex network topology structures such as ring or star network, which improves the flexibility of the system. The Ethernet communication module 9 supports IRT mode to ensure low delay and high reliability requirements for signal processing in industrial environments. In addition, it also supports isochronous synchronous real-time communication, which can achieve precise time synchronization in the network, which is particularly important for application scenarios that require highly coordinated control. The Ethernet communication module 9 not only supports PROFINET protocol, but also can coexist with other standard protocols in the same network, which enhances the compatibility of the system. By integrating the Ethernet communication module 9 into the all-digital AC voltage regulating device, users can easily connect the device to existing industrial networks to realize remote monitoring and parameter adjustment. In large manufacturing workshops, multiple voltage regulating devices distributed in different locations can be centrally managed and optimized by the central control system, which improves production efficiency while reducing operation and maintenance costs.

[0037] In this embodiment: through the built-in Ethernet communication module 9, the full-digital AC voltage regulating device 8 can communicate with industrial equipment supporting the PROFINET protocol at high speed and in real time. It supports real-time communication and isochronous synchronous real-time communication, ensures real-time signal processing, and is suitable for various industrial equipment and control systems. Through the PROFINET network, users can easily integrate the full-digital AC voltage regulating device 8 into the existing industrial Ethernet network, 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 supporting the protocol, and the full-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. Embodiment

[0038] Please refer to Figures 1-4 , the present application provides the following technical solutions:

[0039] A full-digital AC voltage regulating device 8 can provide controllable voltage and current for a slip ring motor, the full-digital AC voltage regulating device 8 comprising main loop power supply 1, 2 parallel-connected converter 4, 5, main control board 6, converter 4, 5 for converting input three-phase AC voltage into controllable three-phase AC voltage and current, for use in speed regulation of three-phase wound-rotor gear lifting motor, the full-digital AC voltage regulating device 8 is provided with an Ethernet communication module 9, and the Ethernet communication module 9 is used for communication with digital equipment.

[0040] In the application of speed regulation control of wound-rotor AC motor, two additional thyristor modules on the parallel branch of the controllable current part push the torque conversion, thereby pushing the converter 4Q four-quadrant operation, and in the automatic commutation stage, the phase sequence on the output of the converter 4, 5 is reversed by electricity, depending on the condition of the load, the function of the converter 4, 5 is in the reverse braking mode, and a very high power and extremely gentle driving cycle is required, so the conventional stator reverse contactor is no longer needed;

[0041] Please refer to Figures 1-4 , the converter 4, 5 can realize four-quadrant operation and has automatic commutation function, can realize reverse braking and driving function under different load conditions, in the automatic commutation stage, the phase sequence on the output of the converter 4, 5 is reversed by electricity, according to the load condition, the function of the frequency converter can be switched between the reverse braking mode and the driving mode, the circuit design for realizing this function includes two additional thyristor modules on the parallel branch, for pushing torque conversion.

[0042] In this embodiment: four-quadrant operation refers to the converter 4, 5 can run in four working modes, namely forward electric (drive), forward power generation (regenerative braking), reverse electric (reverse drive) and reverse power generation (reverse regenerative braking) four modes cover the motor in different load conditions of all working state, the converter 4, 5 through advanced power electronic technology and control algorithm, can realize four-quadrant operation in different load conditions, in the automatic commutation stage, the phase sequence on the output of the converter 4, 5 is realized through the electrical reversal, the function of the converter 4, 5 can be switched between the reverse braking mode and the drive mode. In the reverse braking mode, the converter 4, 5 produces reverse torque by changing the phase sequence to achieve rapid braking; in the drive mode, the converter 4, 5 provides forward torque to make the motor run normally, the converter 4, 5 increases two additional thyristor modules on the parallel branch. These two modules work together in different working modes, through precise control of the conduction and turn-off of thyristor, realize the smooth conversion of torque, the control logic is realized by the software algorithm on the main control board, these algorithms dynamically adjust the trigger sequence and phase sequence of thyristor according to the real-time monitoring of load conditions and system state, ensure that the converter 4, 5 always works in the best state, the converter 4, 5 can significantly improve the response speed and dynamic performance of the system, reduce mechanical impact and energy loss, the converter 4, 5 realizes four-quadrant operation and automatic commutation function through advanced circuit design and control algorithm. This design not only improves the flexibility of the system, but also can dynamically adjust the working mode according to the load condition, ensures the motor to run efficiently and stably in various working conditions.

[0043] For details, please refer to Figures 1-4 The all-digital AC voltage regulating device 8 can also use stator phase angle control to achieve high-level control power and improve speed regulation performance. Stator phase angle control adjusts the phase angle of the motor to achieve precise speed and torque control, and the control method improves the response speed and stability of the system, which is suitable for high-precision control applications.

[0044] In this embodiment: Stator phase angle control is achieved by adjusting the phase angle of the motor stator winding to achieve precise control of the motor speed and torque. The main goal of stator phase angle control is to achieve precise speed and torque control, improve system response speed and stability, and real-time monitoring of motor operating conditions, including speed, torque, current and other parameters. These data are transmitted to the main control board 6 for real-time adjustment of the stator phase angle, and the main control board 6 adjusts the stator phase angle according to the real-time monitoring data and the preset control algorithm. These algorithms usually include PID control, fuzzy control, etc. to ensure that the system can maintain optimal performance under various working conditions. By precisely adjusting the stator phase angle, precise control of small speed changes can be achieved, improving the speed accuracy and response speed of the system. At the same time, the stator phase angle control can effectively suppress torque fluctuations and improve system stability. Stator phase angle control works with the inverter 4, 5 to achieve precise control of the motor. The voltage regulator controls the AC voltage, while the stator phase angle control adjusts the phase angle, and the combination of the two can achieve more efficient energy conversion and more precise control effect. According to the change of stator phase angle, the output voltage and current are dynamically adjusted to ensure stable operation of the motor under different working conditions. By adjusting the stator phase angle, precise control of the motor speed and torque can be achieved, which helps to improve the response speed of the system and can be used in metallurgy, petrochemical, papermaking and other industries. The AC voltage regulator achieves smooth speed regulation and torque control of the motor with a commutator winding by precisely regulating the speed of the generator and changing the trigger sequence of the thyristor and the stator phase angle. The inverter 4, 5 supports four-quadrant operation, enabling reverse braking and driving functions under different load conditions. This allows the motor to maintain stable performance during forward and reverse rotation and acceleration and deceleration. During the automatic commutation phase, the phase sequence on the inverter output is achieved through electrical reversal. According to the load conditions, the frequency converter can switch between reverse braking mode and driving mode to ensure efficient operation of the motor under various working conditions.

[0045] For details, please refer to Figures 1-4 The main control board 6 is placed on one side of the unit, supporting multiple combinations to adapt to different sizes and layouts of the installation environment.

[0046] 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 fixed inside the unit through standard guide rails or supports to ensure its stability. This placement design allows other components to be more reasonably arranged, improving overall space utilization. The main control board 6 is connected with components such as the current transformer 4, 5, and Ethernet communication module 9 through standard interfaces to form a complete voltage regulating device. The placement and combination of the main control board 6 are designed flexibly and modularly to adapt to different sizes and layouts of installation environments. This design not only improves the space utilization of the system, but also provides convenience for users' installation and maintenance.

[0047] For details, please refer to Figures 1-4 The all-digital AC voltage regulating device 8 is provided with an Ethernet communication module 9, which is used for communication with digital devices.

[0048] In this embodiment, the Ethernet communication module 9 is inserted into the optional slot of the main control board 6. The Ethernet communication module 9 has a four-port interface, which is connected to a subnetwork to have Ethernet function. The four-port interface supports connection with other devices to form a subnetwork. The Ethernet communication module 9 supports real-time communication and isochronous synchronous 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.

[0049] For details, please refer to Figures 1-4 The all-digital AC voltage regulating device 8 can be compatible with standard lifting elements and interfaces, facilitating integration into existing industrial automation systems and improving overall system performance.

[0050] In this embodiment, through the built-in Ethernet communication module 9, the all-digital AC voltage regulating device 8 can perform high-speed and real-time communication with industrial devices supporting the PROFINET protocol. It supports real-time communication and isochronous synchronous real-time communication to ensure real-time signal processing and is suitable for various industrial devices and control systems. Through the PROFINET network, users can easily integrate the all-digital AC voltage regulating device 8 into existing industrial Ethernet networks. It supports 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 supporting the protocol. The all-digital AC voltage regulating device 8 supports standard industrial interfaces and provides multiple physical interfaces, achieving seamless integration with existing industrial automation systems. This design not only improves the overall performance of the system, but also provides convenience for users' system construction and maintenance.

[0051] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, modifications or equivalent replacements to the technical solutions described in the foregoing embodiments can be made by those skilled in the art, or some technical features can be replaced equivalently. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. Working principle and use process of the present application:

[0052] In the synchronous motor excitation control application, the main control board adjusts the output phase angle according to the preset control algorithm, thereby controlling the excitation current of the motor, and the size of the excitation current is adjusted through the conduction angle control of the three pairs of anti-parallel thyristors, to ensure the efficient operation of the motor. In this process, the motor excitation output power frequency remains unchanged, which is the same as the power frequency. The compact converter receives standard three-phase alternating voltage input, and through the control of the trigger sequence of the thyristor, the converter converts the input voltage into controllable three-phase voltage and current to meet the needs of different loads.

[0053] In the three-phase wound-rotor gear lifting motor speed regulation application with a slip ring rotor, two additional thyristor modules are used to push the torque conversion on the parallel branch of the controllable current part to realize the four-quadrant operation of the converter. In the automatic commutation stage, the phase sequence on the converter output is realized through electrical inversion, and according to the load conditions, the function of the frequency converter can be switched between the reverse phase braking mode and the driving mode, to ensure the efficient operation of the motor under various working conditions.

[0054] For the network interface, the collected data is transmitted to the main control board through the industrial Ethernet communication module, to accurately control the motor excitation and the speed regulation of the polar slip ring wound AC motor. The main work flow includes initialization and configuration, excitation current regulation, converter control, speed control, system monitoring and adjustment, and user interaction. The communication interface improves the digitalization and intelligentization level of the device, and can conveniently provide remote control and diagnosis functions.

Claims

1. A fully digital AC voltage regulating device (8) capable of providing a field controllable current to a motor rotor, said fully digital AC voltage regulating device (8) comprising a main circuit power supply (1, 2), 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 can convert input three-phase alternating voltage into controllable three-phase alternating voltage and current, and can regulate and control motor excitation current; The full-digital AC voltage regulating device (8) is provided with an Ethernet communication module (9) for communicating with digital devices; The Ethernet communication module (9) is plugged into the main control board (6), and has a four-port interface on the Ethernet communication module (9) to access a subnetwork, so that the Ethernet communication module (9) has Ethernet function, and the four-port interface supports connection with other devices to form a ring network.

2. The all-digital AC voltage regulator (8) according to claim 1, characterized in that: The converter (4, 5) realizes the regulation of alternating voltage by changing the triggering sequence and conduction angle of thyristors.

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