Multifunctional wide-voltage generator set and alternating-current and direct-current ice melting power supply vehicle

Abstract

The utility model belongs to the technical field of ice melting equipment, and particularly discloses a multifunctional wide-voltage generator set and an alternating-current and direct-current ice melting power van, which comprise an engine module, a generator module and a set control cabinet, the unit control cabinet comprises a mode selection switch and a unit controller, the control signal input end of the unit controller is connected with the control end of the mode selection switch, and the mode selection switch is used for selecting a DVR mode or an AVR mode; the generator module comprises a DVR / AVR module, and the DVR / AVR module comprises a voltage detection unit, a current detection unit, a power supply unit, a grounding unit, an external synchronous fine tuning voltage signal input unit, an external ice melting wide voltage signal input unit, an excitation output unit, and a DVR / AVR mode switching unit. And the generator module selects the DVR / AVR module to operate in a DVR mode or an AVR mode according to the switching of the mode selection switch. By adopting the technical scheme, the DVR / AVR module is switched and selected, wide voltage of 0-110% of rated voltage can be directly output, and fine output can also be realized for parallel operation and grid connection power protection work.

Description

Technical Field

[0001] The utility model belongs to the technical field of ice-melting equipment and relates to a multifunctional wide-voltage generator set and an AC / DC ice-melting power supply vehicle. Background Art

[0002] When an ice disaster occurs, the power grid generally uses two methods to melt ice: direct current or alternating current. Because the internal resistance of the line to be melted is fixed, according to Ohm's law I = U / R, no matter which method is used, because the mains or power generation power supply currently has no ability to adjust within an ultra-wide range (0-110%), it is generally necessary to add a step-down transformer to adjust the output voltage to achieve the current required for controlling the line to melt ice, and achieve the effect of melting ice by generating heat through the line.

[0003] The power source for ice melting is usually generated by the mains power of the substation or the power supply vehicle. In the case of lines that are inconvenient to access the mains power or have no mains power, the ice melting operation usually uses an emergency generator vehicle + transformer + ice melting vehicle. This virtually increases the time for connecting the transformer equipment, the transportation time and the cost, which is undoubtedly a double whammy in the rescue work of ice melting after an ice disaster.

[0004] AVR (Automatic voltage regulator) is an important component of a three-phase synchronous generator. At present, it generally refers to an automatic voltage regulator made using analog electronic technology circuits such as semiconductor thyristors. It has the characteristics of simple structure, easy output control, low cost, and long life. However, the output signal is greatly affected by environmental harmonics and components, and is easily distorted and produces errors. Compared with DVRs using digital electronic technology, its accuracy is poor, and it is more suitable for single-machine operation with lower voltage change requirements.

[0005] At present, large-scale integrated circuits and computer technology have become increasingly mature, and digital voltage regulators (DVRs) using computer technology have been successfully developed and put into industrial operation. DVRs have the advantages of high precision, good stability, and simple design, but their output signal control function is inferior to that of AVRs using analog electronic technology, that is, DVRs are inferior to AVRs in controlling large-scale and continuous output changes. They are more suitable for situations requiring high precision, stable voltage output, and rapid response after disturbances, such as power grid protection, synchronous parallel operation, and synchronous grid-connected operation.

[0006] However, no matter DVR or AVR, the current technology cannot directly use products that can produce 0-110% rated voltage continuously adjustable output. Even after redesign, the single AVR based on analog electronic technology and the DVR based on digital technology cannot be well applied to winter ice melting operations or normal parallel connection and grid power protection operations.

[0007] The unit controller is the brain that controls and protects the generator set. It is generally divided into single-machine type and synchronous parallel-grid type. The single-machine unit controller can shield or have an extremely wide voltage protection range. The operation is relatively simple and can be used for wide voltage regulation, but it does not have the synchronous parallel-grid function; the synchronous parallel-grid controller can control the fine-tuning of voltage and frequency. It is mostly used in power supply vehicles for parallel-grid power protection, but its power generation or bus protection does not have shielding or an extremely wide voltage protection range. If the limit is exceeded, an alarm will be issued to shut down. Many control functions are limited when applied to extremely low or extremely high voltages, such as closing control failure alarm, closing feedback alarm, load control alarm, and voltage regulation control alarm. Similarly, neither the single-machine controller nor the directly applied parallel-grid controller can directly control the two states, and the use of two controllers increases the difficulty of wiring control and the complexity of control.

[0008] For example, patent CN201610727188.9 discloses a power supply system including a power supply synchronization controller, a plurality of single-phase power supply devices, and a plurality of section interconnection switches. The single-phase power supply device includes a multi-secondary winding transformer, a plurality of power conversion units and a main controller. Multiple controllers and transformers are provided, and the structural connection is complex and the cost is high. Utility Model Content

[0009] The utility model aims to provide a multifunctional wide-voltage generator set and an AC / DC ice-melting power supply vehicle, which can switch between DVR / AVR modes, directly output a wide voltage of 0-110% of the rated voltage, and can also output finely for parallel operation and grid connection.

[0010] In order to achieve the above-mentioned purpose, the basic scheme of the utility model is: a multifunctional wide-voltage generator set, including an engine module, a generator module and a unit control cabinet;

[0011] The engine module is connected to the generator module and the unit control cabinet respectively, and the generator module is connected to the unit control cabinet;

[0012] The unit control cabinet includes a mode selection switch and a unit controller, the control signal input end of the unit controller is connected to the control end of the mode selection switch, and the mode selection switch is used to select the DVR mode or the AVR mode;

[0013] The generator module includes a DVR / AVR module, and the DVR / AVR module includes a voltage detection unit, a current detection unit, a power supply unit, a grounding unit, an external synchronous fine-tuning voltage signal input unit, an external ice-melting wide voltage signal input unit, an excitation output unit, and a DVR / AVR mode switching unit. The generator module selects the DVR / AVR module to operate in DVR mode or AVR mode according to the switching of the mode selection switch.

[0014] The working principle and beneficial effects of this basic solution are: this technical solution integrates digital / analog electronic technology, automatically adjusts the voltage through the mode selection switch of the unit control cabinet, switches the DVR / AVR module to DVR mode or AVR mode, and can combine the advantages of both, avoid the disadvantages, and be perfectly applied to two different working conditions.

[0015] Furthermore, the engine module includes an engine body, a water tank and an exhaust pipe, and the engine body is connected to the water tank and the exhaust pipe respectively.

[0016] The engine module has a simple structure and is easy to use, and the water tank can assist in heat dissipation.

[0017] Further, the generator module also includes a main stator winding, a main rotor, a rectifier bridge, an exciter rotor, an exciter stator, a permanent magnet machine, a main output terminal, a current transformer and a voltage transformer;

[0018] The main stator winding is connected to a current transformer and a voltage transformer respectively, and the main rotor is connected to a rectifier bridge and an exciter rotor respectively.

[0019] The unit controller is connected to the DVR / AVR module. Its main function is to control the DVR / AVR to fine-tune the voltage by outputting a ±10V voltage signal, thereby meeting the requirements of multiple generator sets or generator sets running in parallel with the municipal power grid at the same time.

[0020] The DVR / AVR module is connected to the main stator winding to collect the winding temperature for protection, connected to the excitation machine stator to control the excitation current and thus the stator winding voltage, connected to an independent permanent magnet machine to provide a stable control power supply to the DVR / AVR, connected to a voltage transformer for generating voltage collection for closed-loop voltage control, connected to a current transformer for overcurrent or short-circuit protection during generating current collection; connected to a mode selection switch for internal DVR / AVR circuit switching.

[0021] Further, the DVR / AVR module includes a power supply, a DVR mode switch and an AVR mode switch respectively connected to one end of the power supply, the DVR mode switch is connected to the coil of the DVR control power relay, the AVR mode switch is connected to the coil of the AVR control power relay, and the other ends of the coils of the DVR control power relay and the AVR control power relay are connected to the other end of the power supply;

[0022] It also includes a DVR control board and an AVR control board respectively connected to the power supply, wherein the DVR control board is connected to the normally open contact of the DVR control power relay, and the AVR control board is connected to the normally open contact of the AVR control power relay.

[0023] Furthermore, the DVR control board includes a PID regulation circuit, the input end of the PID regulation circuit is connected to the set value input end, the set value is a rated voltage value, the feedback end of the PID regulation circuit is connected to the voltage transformer, and the output end of the PID regulation circuit is connected to the excitation current regulation end of the exciter stator.

[0024] The DVR / AVR module switches to mode and performs corresponding operations to meet usage requirements.

[0025] Furthermore, the AVR control board includes a set value input terminal, the set value range is 0-110% of the rated voltage, the set value input terminal is connected to the first input terminal of the amplifier, the output terminal of the amplifier is connected to the input terminal of the controller, and the output terminal of the controller is connected to the excitation current regulating terminal of the stator of the exciter.

[0026] Furthermore, the unit control cabinet also includes a multi-turn self-locking potentiometer, and the multi-turn self-locking potentiometer is connected to the input end of the DVR / AVR module.

[0027] The multi-turn self-locking potentiometer provides smooth and continuous resistance value changes and has a self-locking function to ensure that the adjusted position can remain stable. In AVR mode, the generator excitation current is controlled by the input multi-turn potentiometer, thereby achieving a 0-110% ultra-wide voltage linear continuous change output of the motor.

[0028] Furthermore, it also includes a base, and the engine module, the generator module and the unit control cabinet are all installed on the base.

[0029] Each module is integrated and installed on the base, which is convenient for centralized installation and use.

[0030] The utility model also provides an AC / DC ice-melting power supply vehicle, comprising a vehicle body and the multifunctional wide-voltage generator set of the utility model arranged on the vehicle body.

[0031] The vehicle is equipped with a multifunctional wide-voltage generator set, which can realize arbitrary switching between DVR mode and AVR mode. It can combine the advantages of both modes while avoiding their disadvantages, and can be perfectly applied to two different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of the utility model multifunctional wide voltage generator set;

[0033] Figure 2 This is a structural diagram of the DVR / AVR module of the utility model multifunctional wide voltage generator set;

[0034] Figure 3 The utility model discloses a circuit diagram of a DVR / AVR module of a multifunctional wide-voltage generator set.

[0035] The reference numerals in the drawings of the specification include: engine module 1, generator module 2, main stator winding 3, main rotor 4, rectifier bridge 5, exciter rotor 6, exciter stator 7, permanent magnet machine 8, main output terminal 9, current transformer 10, voltage transformer 11, mode selection switch 12, unit controller 13, DVR / AVR module 14, multi-turn self-locking potentiometer 15;

[0036] Voltage detection unit 141, current detection unit 142, power supply unit 143, grounding unit 144, external ice-melting wide voltage signal input unit 145, excitation output unit 146, DVR / AVR mode switching unit 147, external synchronous fine-tuning voltage signal input unit 148. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only 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 operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0040] The utility model discloses a multifunctional wide voltage generator set, and designs a D / AVR (Digital / analog voltage regulator), which is a digital / analog electronic technology fusion type automatic voltage regulator, which has both advantages, avoids disadvantages, and is perfectly applied to two different working conditions. That is, it can directly output a wide voltage of 0-110% of the rated voltage, and can also output finely for parallel operation and grid connection.

[0041] like Figure 1 As shown, the multifunctional wide voltage generator set comprises an engine module 1, a generator module 2 and a unit control cabinet. The engine module 1 is electrically connected to the generator module 2 and the unit control cabinet respectively, and the generator module 2 is electrically connected to the unit control cabinet.

[0042] The unit control cabinet includes a mode selection switch 12 (such as Schneider ZB2-BD3C, etc.) and a unit controller 13 (such as Comai I G4 200, etc.). The control signal input end of the unit controller 13 is electrically connected to the control end of the mode selection switch 12. The mode selection switch 12 is used to select DVR mode or AVR mode.

[0043] The generator module 2 includes a DVR / AVR module 14, such as Figure 2 As shown, the DVR / AVR module 14 includes a voltage detection unit 141, a current detection unit 142, a power supply unit 143, a grounding unit 144, an external synchronous fine-tuning voltage signal input unit 148, an external ice-melting wide voltage signal input unit 145, an excitation output unit 146, and a DVR / AVR mode switching unit 147. The generator module 2 selects the DVR / AVR module 14 to operate in DVR mode or AVR mode according to the switching of the mode selection switch 12.

[0044] Combining the mode selection switch 12 and the unit controller 13, changing the excitation current of the D / AVR to achieve continuous voltage changes is an open-loop control method. The unit can have a fixed voltage closed-loop control output like an ordinary diesel generator, and can also have a wide voltage open-loop control output to expand the application of the equipment.

[0045] Preferably, the two modes of circuit boards are embedded in a voltage regulator, and the hardware of the built-in digital control circuit board and the analog control circuit board is switched by input (it can be realized by controlling the power supply of the two circuit boards with a built-in relay). The two embedded circuit boards share the power supply part, the excitation output part, and the grounding part.

[0046] In a preferred embodiment of the present invention, the engine module 1 comprises an engine body, a water tank and an exhaust pipe, and the engine body is connected to the water tank and the exhaust pipe respectively. The engine module 1 has a simple structure and is easy to use, and the water tank can assist in heat dissipation.

[0047] In a preferred embodiment of the present invention, the generator module 2 further includes a main stator winding 3, a main rotor 4, a rectifier bridge 5, an exciter rotor 6, an exciter stator 7, a permanent magnet machine 8, a main output terminal 9, a current transformer 10 and a voltage transformer 11, and the specific models are shown in Table 1.

[0048] Table 1 Spare parts model

[0049]

[0050] The main stator winding 3 is electrically connected to the current transformer 10 and the voltage transformer 11, respectively, and the main rotor 4 is electrically connected to the rectifier bridge 5 and the exciter rotor 6. The DVR / AVR module 14 is electrically connected to the main stator winding 3, the exciter stator 7, the permanent magnet machine 8, the current transformer 10, the voltage transformer 11, the mode selection switch 12 and the unit controller 13.

[0051] The unit controller 13 is electrically connected to the DVR / AVR module 14. The main function of the unit controller 13 is to control the DVR / AVR to perform voltage fine-tuning by outputting a ±10V voltage signal, thereby achieving the requirement of multiple generator sets or generator sets running in parallel with the municipal power grid at the same time.

[0052] The DVR / AVR module 14 is connected to the main stator winding 3 to collect the winding temperature for protection, connected to the excitation machine stator 7 to control the excitation current and thus the stator winding voltage, connected to the independent permanent magnet machine 8 to provide a stable control power supply to the DVR / AVR, connected to the voltage transformer 11 for collecting the power generation voltage for closed-loop control of the voltage, and connected to the current transformer 10 for overcurrent or short-circuit protection during power generation current collection; connected to the mode selection switch 12 for internal DVR / AVR circuit switching.

[0053] In a preferred embodiment of the utility model, the DVR / AVR module includes a power supply, a DVR mode switch and an AVR mode switch respectively connected to one end of the power supply, the DVR mode switch is electrically connected to the coil of the DVR control power relay, the AVR mode switch is connected to the coil of the AVR control power relay, and the other ends of the coils of the DVR control power relay and the AVR control power relay are electrically connected to the other end of the power supply;

[0054] It also includes a DVR control board and an AVR control board (an existing circuit control board can be used) which are electrically connected to the power supply respectively. The DVR control board is electrically connected to the normally open contact of the DVR control power relay, and the AVR control board is electrically connected to the normally open contact of the AVR control power relay.

[0055] Preferably, the DVR control board includes a PID regulation circuit (such as a conventional PID regulator circuit, a DDZ-type basic regulator, etc.), the input end of the PID regulation circuit is electrically connected to the set value input end (which can be manually input through a physical control panel or a digital interface, for example, the input value is set through a button knob or a touch screen), the set value is a rated voltage value, the feedback end of the PID regulation circuit is electrically connected to the voltage transformer, and the output end of the PID regulation circuit is connected to the excitation current regulation end of the stator of the exciter.

[0056] The AVR control board includes a set value input terminal (which can be manually input through a physical control panel or a digital interface, such as setting the input value through a button knob or a touch screen), the set value range is 0-110% of the rated voltage, the set value input terminal is electrically connected to the first input terminal of the amplifier, the output terminal of the amplifier is electrically connected to the input terminal of the controller (such as ATmega328P, or ATtiny85), and the output terminal of the controller is electrically connected to the excitation current adjustment terminal of the exciter stator. The set value is determined by the position of the potentiometer. Assuming that the potentiometer has 11 turns in total, the voltage can rise by 1kV for each rotation. The amplifier can amplify the input signal to achieve a wider range of excitation output. The output voltage can be adjusted by adjusting the magnitude of the excitation current, which can be achieved by using existing technology and will not be described in detail here.

[0057] like Figure 3 As shown, preferably, the DVR / AVR module 14 is selected as the DVR mode, the voltage and current related protection and the voltage PID adjustment are turned on, and the closed-loop adjustment mode is entered.

[0058] Select the DVR / AVR module 14 as AVR mode, cancel the voltage-related voltage protection and PID adjustment, and enter the open-loop adjustment mode, that is, the 0-110% rated voltage extremely wide continuously adjustable output mode in the ice-melting vehicle mode (that is, the ice-melting vehicle mode), to achieve a wide voltage generator set for ice-melting vehicles and a stable constant voltage generator set for power supply vehicles, and also save the controller cost.

[0059] The hardware of the built-in digital control circuit board and analog control circuit board is switched through input, and the mode is switched by switching the power supply of the circuit board.

[0060] In a preferred embodiment of the present invention, the unit control cabinet further includes a multi-turn self-locking potentiometer 15 (such as BOURNS brand 590S-2-502L, etc.), and the multi-turn self-locking potentiometer 15 is electrically connected to the input end of the DVR / AVR module 14.

[0061] The multi-turn self-locking potentiometer 15 provides smooth and continuous resistance value changes and has a self-locking function to ensure that the adjusted position can remain stable. The multi-turn self-locking potentiometer 15 is connected to the input of the D / AVR to provide continuous linear excitation output, cancel the voltage regulation range limit of the voltage regulator, and increase the excitation regulation range, thereby achieving smooth ultra-wide range regulation of the motor. Compared with the existing digital adjustment DVR controller, the voltage regulation is more linear and has a wider range; compared with the analog adjustment AVR controller, the voltage regulation range is wider.

[0062] In a preferred embodiment of the present invention, the multifunctional wide-voltage generator set further comprises a base, on which the engine module 1, the generator module 2 and the unit control cabinet are all fixedly mounted (such as by welding, riveting, screw connection, etc.). Each module is integratedly mounted on the base, which is convenient for centralized installation and use.

[0063] The utility model also provides an AC / DC ice melting power supply vehicle, comprising a vehicle body and the multifunctional wide-voltage generator set of the utility model arranged on the vehicle body. The vehicle is provided with a multifunctional wide-voltage generator set, which can realize arbitrary switching between DVR mode and AVR mode, and can have both advantages, avoid disadvantages, and be perfectly applied to two different working conditions.

[0064] The utility model integrates AVR (analog excitation voltage regulator) and DVR (digital excitation voltage regulator) D / AVR (digital / analog voltage regulation), which has the advantages of DVR in normal rated voltage mode, namely high response speed, low distortion rate, fast response and other characteristics; and has the continuous type of AVR excitation voltage regulation in wide voltage mode, and the stepless voltage regulation function with more linear stator output voltage. Compared with the design of two independent voltage regulator boards, the design of sharing power supply, excitation output and grounding can effectively save space, wiring harness, and conversion digits of the conversion switch, reduce the construction difficulty of workers and the overall failure rate, and have lower costs.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0066] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multifunctional wide voltage generator set, characterized in that: Including engine module, generator module and unit control cabinet; The engine module is connected to the generator module and the unit control cabinet respectively, and the generator module is connected to the unit control cabinet; The unit control cabinet includes a mode selection switch and a unit controller, the control signal input end of the unit controller is connected to the control end of the mode selection switch, and the mode selection switch is used to select the DVR mode or the AVR mode; The generator module includes a DVR / AVR module, and the DVR / AVR module includes a voltage detection unit, a current detection unit, a power supply unit, a grounding unit, an external synchronous fine-tuning voltage signal input unit, an external ice-melting wide voltage signal input unit, an excitation output unit, and a DVR / AVR mode switching unit. The generator module selects the DVR / AVR module to operate in DVR mode or AVR mode according to the switching of the mode selection switch.

2. The multifunctional wide-voltage generator set according to claim 1, characterized in that: The engine module comprises an engine body, a water tank and a smoke exhaust pipe, and the engine body is connected to the water tank and the smoke exhaust pipe respectively.

3. The multifunctional wide-voltage generator set according to claim 1, characterized in that: The generator module also includes a main stator winding, a main rotor, a rectifier bridge, an exciter rotor, an exciter stator, a permanent magnet machine, a main output terminal, a current transformer and a voltage transformer; The main stator winding is connected to a current transformer and a voltage transformer respectively, and the main rotor is connected to a rectifier bridge and an exciter rotor respectively.

4. The multifunctional wide-voltage generator set according to claim 1, characterized in that: The DVR / AVR module includes a power supply, a DVR mode switch and an AVR mode switch respectively connected to one end of the power supply, the DVR mode switch is connected to the coil of the DVR control power relay, the AVR mode switch is connected to the coil of the AVR control power relay, and the other ends of the coils of the DVR control power relay and the AVR control power relay are connected to the other end of the power supply; It also includes a DVR control board and an AVR control board respectively connected to the power supply, wherein the DVR control board is connected to the normally open contact of the DVR control power relay, and the AVR control board is connected to the normally open contact of the AVR control power relay.

5. The multifunctional wide-voltage generator set according to claim 4, characterized in that: The DVR control board includes a PID regulation circuit, an input end of the PID regulation circuit is connected to a set value input end, the set value is a rated voltage value, a feedback end of the PID regulation circuit is connected to a voltage transformer, and an output end of the PID regulation circuit is connected to an excitation current regulation end of an exciter stator.

6. The multifunctional wide-voltage generator set according to claim 4, characterized in that: The AVR control board includes a set value input terminal, the set value range is 0-110% of the rated voltage, the set value input terminal is connected to the first input terminal of the amplifier, the output terminal of the amplifier is connected to the input terminal of the controller, and the output terminal of the controller is connected to the excitation current regulating terminal of the stator of the exciter.

7. The multifunctional wide-voltage generator set according to claim 1, characterized in that: The unit control cabinet also includes a multi-turn self-locking potentiometer, which is connected to the input end of the DVR / AVR module.

8. The multifunctional wide-voltage generator set according to claim 1, characterized in that: It also includes a base, on which the engine module, the generator module and the unit control cabinet are all installed.

9. An AC / DC ice-melting power supply vehicle, characterized in that: It comprises a vehicle body, and a multifunctional wide-voltage generator set as claimed in any one of claims 1 to 8 arranged on the vehicle body.

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