Small generator set control system and control method

Abstract

The invention relates to the technical field of generators, in particular to a small generator set control system and method. The small generator set control system comprises a control module, a power piece and a generator. The control module is electrically connected with the power part, the generator and the output end of the generator, and the control module can receive an external control signal; the power piece is connected with the generator, the output end of the generator can supply power to the load, the functions of overload protection, automatic idling, working frequency switching, power generation switch control and the like can be achieved only through one control module without a circuit breaker, the integration degree is high, and stability is good.

Description

Technical Field

[0001] The present invention relates to the technical field of generators, and particularly to a control system and a control method for a small generator set. Background Art

[0002] A generator is a mechanical device that converts mechanical energy into electrical energy. The energy generated by a power component is converted into mechanical energy and transmitted to the generator, which then converts it into electrical energy. Among them, the power component can be a water turbine driven by water flow, a steam turbine driven by air flow, a diesel engine driven by fuel combustion, or other power machinery.

[0003] Conventional power frequency generator sets achieve functions such as overload protection, automatic idling, working frequency switching, and power generation switch control by setting a control module. In conventional power frequency generator sets, a voltage regulator is generally used to adjust the voltage output. Due to inaccurate design of overload protection, short-circuit protection is usually designed. However, the design of short-circuit protection conflicts with the circuit breaker control for different generator sets, and sometimes the voltage regulator in the same generator set will protect earlier than the circuit breaker. At the same time, the speed control of conventional power frequency generator sets uses mechanical speed regulation or electronic speed regulation, without considering automatic idling and working frequency switching.

[0004] For some power frequency generator sets, automatic idling and working frequency switching can be achieved. Among them, automatic idling control is achieved by collecting the output current of the motor and then sending a signal to the power speed regulation mechanism. The working frequency switching is achieved by using different circuit breakers for the output power control (that is, different specifications of circuit breakers are used for different power segments), so as to achieve overload protection and power generation switch control.

[0005] In the above related technologies, conflicts are likely to occur between the voltage regulator and the circuit breaker in the power frequency generator. When functions such as automatic idling, working frequency switching, and power generation switch control need to be achieved, multiple circuit breakers are required, and each function of the power frequency generator set belongs to different modules, and multiple control modules need to be set, so the integration degree is low and the stability is poor. Summary of the Invention

[0006] The present invention aims to provide a control system and a control method for a small generator set. The control system for the small generator set is used to implement the control method for the small generator set, which can achieve functions such as overload protection, automatic idling, working frequency switching, and power generation switch control without a circuit breaker and only requires one control module, with high integration degree and good stability.

[0007] To solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, the present invention provides a control system for a small generator set, comprising: a control module, a power component, and a generator; the control module is electrically connected to the power component, the generator, and the output terminal of the generator respectively, and the control module can receive an external control signal; the power component is connected to the generator, and the output terminal of the generator can supply power to a load.

[0009] By adopting the above technical solution, when starting the control system of the small generator set, the generator is started manually. When the control system of the small generator set is running, the control module can adjust the output voltage of the generator. The control module can also collect the igniter signal and the generator signal, so as to obtain the overall speed of the generator, and adjust the overall speed of the generator by controlling the power component. When the automatic idle of the control system of the small generator set is required, the user can give an external signal to the control module or set it by default to start the automatic idle function of the generator. During the automatic idle process, the control module can determine the load current by obtaining the voltage at the output terminal of the generator. When the load current is greater than the set value, the control module can adjust the overall speed of the generator by controlling the power component to realize the automatic idle function. When the frequency switching of the control system of the oil and gas generator set is required, the control module can receive an external frequency control signal to realize frequency switching, or set the rated frequency during internal debugging. When overload protection is required, the control module can set protection according to generators with different powers. The generator is loaded with power through a test bench. When the set value is reached, an external protection setting signal is given to the control module to record the overload protection value of the generator and complete the protection setting. The control module sets a protection curve. When the load is greater than the overload protection value, the control module cuts off the external output voltage. When load open circuit control is required, the output voltage needs to be disconnected. An external open circuit control signal can be given to the control module, and the control module can switch the excitation current to cut off the output, so as to achieve the purpose of output voltage switch control.

[0010] In the above process, an integrated control can be achieved by using one control module without configuring a circuit breaker, specifically including: functions such as automatic idle, unit start-stop control, unit voltage regulation control, working frequency switching, overload protection, output power-off control, etc., with high integration and good stability.

[0011] Optionally, the power component includes a carburetor, an igniter, and a starting motor; the carburetor and the igniter are electrically connected to the control module respectively, and the starting motor is used to start the generator 3.

[0012] By adopting the above technical solution, after the starting motor starts the generator to generate electricity, the carburetor can control the speed of the generator, and the igniter can ignite.

[0013] Optionally, the control module includes a voltage regulating and protecting unit, a speed regulating unit, and a starting control unit; the speed regulating unit is electrically connected to the voltage regulating and protecting unit, the starting control unit, and the carburetor respectively, the voltage regulating and protecting unit is electrically connected to the generator and the output end of the generator respectively, and the starting control unit is electrically connected to the igniter and the starting motor respectively.

[0014] By adopting the above technical solution, the voltage regulating and protecting unit can detect the output power of the generator and set a protection value, and can also control the output switch. By connecting with the generator, the voltage regulating and protecting unit can effectively detect and regulate the output voltage of the generator. By detecting the output end of the motor and determining the load size through the connected speed regulating unit, the voltage regulating and protecting unit can enable the speed regulating unit to control the generator to execute the idle speed or rated speed mode. Under the control of the starting control unit, the speed regulating unit can realize the control of the throttle valve of the air door. The speed regulating unit can adjust the speed through the feedback data of the starting control unit or the voltage regulating and protecting unit, so that the generator executes the rated speed or idle speed. The starting control unit can realize the starting and stopping control by connecting with the igniter, and at the same time feedback the speed to the speed regulating unit. The starting control unit determines whether to start by detecting the starting motor.

[0015] Optionally, the small generator set control system is characterized in that it further includes a battery, and the battery is electrically connected to the starting motor and the starting control unit.

[0016] By adopting the above technical solution, during starting, the control module sends a starting signal to the starting motor, and the starting motor can convert the electrical energy in the battery into mechanical energy based on the starting signal and start the generator, thereby realizing the self-starting of the generator.

[0017] Optionally, the small generator set control system further includes a charging module, the power component further includes a charging coil located on one side of the starting motor, and the charging module is respectively connected to the battery and the charging coil.

[0018] By adopting the above technical solution, during the operation of the starting motor, the charging coil can charge the battery through the charging module.

[0019] In a second aspect, the present invention provides a control method for a small generator set, adopting the small generator set control system as described in the first aspect, including the following steps:

[0020] S1: During starting, the control module sends a starting signal to the starting motor;

[0021] S2: The starting motor converts the electrical energy in the battery into mechanical energy based on the starting signal and starts the generator;

[0022] S3: During operation, the control module regulates the output voltage of the generator;

[0023] S4: The control module collects the igniter signal and the generator signal, and controls the opening degree of the carburetor throttle based on the igniter signal and the generator signal, so as to control the fuel supply amount and adjust the overall machine speed of the generator.

[0024] Optionally, the small generator set control method further includes: during automatic idle speed, the control module receives an external signal or activates the automatic idle speed function of the generator through default settings. The control module determines the load current by obtaining the voltage at the output end of the generator. When the load current is greater than the set value, the control module controls the opening degree of the carburetor throttle, so as to control the fuel supply amount and adjust the overall machine speed of the generator.

[0025] Optionally, the small generator set control method further includes: during frequency switching, the control module receives an external frequency control signal to achieve frequency switching, or sets the rated frequency through internal debugging.

[0026] Optionally, the small generator set control method further includes: during overload protection, the control module sets protection according to generators of different powers. The generator is loaded with power through a test bench. When the set value is reached, the control module obtains an external protection setting signal, records the overload protection value of the generator to complete the protection setting. The control module sets a protection curve. When the load is greater than the overload protection value, the control module cuts off the external output voltage.

[0027] Optionally, the small generator set control method further includes: during load open circuit control, the control module obtains an open circuit control signal and switches the excitation current of the generator based on the open circuit control signal.

[0028] In summary, the present invention at least includes the following beneficial technical effects:

[0029] The small generator set control system of the present invention can achieve functions such as overload protection, automatic idle speed, working frequency switching, and power generation switch control without a circuit breaker and only requires one control module, with high integration and good stability. Description of the Drawings

[0030] Figure 1 It is the control schematic diagram of the small generator set control system in the embodiment of the present invention.

[0031] Figure 2 It is the flow block diagram of the small generator set control method in the embodiment of the present invention.

[0032] Description of the reference numerals: 1. Control module; 11. Voltage regulation and protection unit; 12. Speed regulation unit; 13. Starting control unit; 2. Power component; 21. Carburetor; 22. Igniter; 23. Starting motor; 24. Charging coil; 3. Generator; 4. Battery; 5. Charging module. Detailed implementation manners

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The terms used in the following embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the description of the present invention and the appended claims, the singular forms "a", "an", "the", "above-mentioned", "said", and "this" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in the present invention refers to and includes any or all possible combinations of one or more of the listed items. The term "exemplary" means "serving as an example, embodiment or illustration", and any embodiment described as "exemplary" here does not have to be construed as superior to or better than other embodiments. The terms "first" and "second" are only used for descriptive purposes and cannot be construed as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0035] An embodiment of the present invention provides a control system for a small generator set.

[0036] Refer to Figure 1 , a control system for a small generator set, comprising: a control module 1, a power component 2, a generator 3, a battery 4 and a charging module 5.

[0037] The control module 1 is electrically connected to the power component 2, the generator 3, the battery 4 and the output terminal of the generator 3 respectively, and the control module 1 can receive an external control signal, and the output terminal of the generator 3 can supply power to a load. The battery 4 is electrically connected to the power component 2 and the control module 1 respectively.

[0038] The power component 2 includes a carburetor 21, an igniter 22, a starter motor 23 and a charging coil 24. The carburetor 21 and the igniter 22 are electrically connected to the control module 1 respectively, the starter motor 23 is electrically connected to the battery 4, and the starter motor 23 is used to start the generator 3. The charging coil 24 is located on one side of the starter motor 23, and the charging module 5 is electrically connected to the battery 4 and the charging coil 24 respectively.

[0039] The control module 1 includes a voltage regulating and protecting unit 11, a speed regulating unit 12, and a starting control unit 13; the speed regulating unit 12 is electrically connected to the voltage regulating and protecting unit 11, the starting control unit 13, and the carburetor 21 respectively, the voltage regulating and protecting unit 11 is electrically connected to the generator 3 and the output terminal of the generator 3 respectively, and the starting control unit 13 is electrically connected to the igniter 22, the starting motor 23, and the battery 4 respectively.

[0040] When starting the small generator set control system is required, the battery 4 supplies power to the control module 1, and the control module 1 sends a starting signal to the starting motor 23; the starting motor 23 converts the electrical energy in the battery 4 into mechanical energy based on the starting signal and starts the generator 3.

[0041] Specifically, the voltage regulating and protecting unit 11 can detect the magnitude of the generator output power and set a protection value, and can also control the output switch. By connecting with the generator 3, the voltage regulating and protecting unit 11 can effectively detect and regulate the output voltage of the generator 3. By detecting the output terminal of the motor 3 and determining the load magnitude through the connected speed regulating unit 12, the voltage regulating and protecting unit 11 can enable the speed regulating unit 12 to control the generator 3 to execute the idle speed or rated speed mode. Under the control of the starting control unit 13, the speed regulating unit 12 can achieve the control of the throttle valve of the air door. The speed regulating unit 12 can adjust the speed through the feedback data of the starting control unit 13 or the voltage regulating and protecting unit 11, so that the generator 3 executes the rated speed or idle speed. The starting control unit 13 can achieve the starting and stopping control by connecting with the igniter 22, and at the same time feedback the speed to the speed regulating unit 12. The starting control unit 13 determines whether to start by detecting the starting motor 23.

[0042] When the small generator set control system is running, the control module 1 can regulate the output voltage of the generator 3. The control module 1 can also collect the igniter signal and the generator signal, so as to obtain the overall speed of the generator, and control the fuel supply amount by controlling the throttle opening of the carburetor 21, thereby regulating the overall speed of the generator 3. Specifically, the igniter signal is an alternating current signal for determining the speed, so as to facilitate the flameout control. The generator signal is the current and voltage signal of the generator 3, so as to facilitate the voltage regulation control.

[0043] When the automatic idle speed of the small generator set control system is required, the user can give an external signal to the control module 1 or set it by default to start the automatic idle speed function of the generator 3. During the automatic idle speed process, the control module 1 can determine the load current by obtaining the voltage at the output terminal of the generator. When the load current is greater than the set value, the control module 1 can control the fuel supply amount by controlling the throttle opening of the carburetor 21, thereby regulating the overall speed of the generator 3 and realizing the automatic idle speed function.

[0044] When frequency switching is required for the control system of the oil and gas generating unit, the control module 1 can receive an external frequency control signal to achieve frequency switching, or set the rated frequency through internal debugging.

[0045] When overload protection is required, the control module 1 can set protection according to generators 3 with different powers. The generator 3 is loaded with power through a test bench. When the set value is reached, an external protection setting signal is given to the control module 1, and the overload protection value of the generator is recorded to complete the protection setting. The control module 1 sets a protection curve. When the load is greater than the overload protection value, the control module 1 cuts off the external output voltage.

[0046] When load open - circuit control is required, the output voltage needs to be disconnected. An external open - circuit control signal (low - voltage control signal) can be given to the control module 1, and the control module 1 can switch the excitation current, thereby cutting off the output to achieve the purpose of output voltage switch control.

[0047] The implementation principle of the control system of a small - scale generating unit in an embodiment of the present invention is as follows: Using a voltage regulator for voltage regulation control, a control for the power generation switch is developed. With the control of the power generation switch, load output detection is added, and overload protection control is designed; at the same time, for load detection, speed regulation control is increased to achieve the control of the idle - speed function. The speed regulation module itself has a speed regulation function, so adding a control signal can achieve frequency switching between 50HZ / 60HZ. At the same time, the control module 1 controls the rotational speed, and adding a start - up function is just icing on the cake.

[0048] The present invention uses a control module 1 and can achieve integrated control without configuring a circuit breaker, specifically including: functions such as automatic idle - speed, unit start - stop control, unit voltage regulation control, operating frequency switching, overload protection, output power - off control, etc.

[0049] An embodiment of the present invention also provides a control method for a small - scale generating unit.

[0050] Reference Figure 2 , a control method for a small - scale generating unit, includes the following steps:

[0051] S1: During start - up, the control module 1 sends a start signal to the start motor 23.

[0052] S2: The start motor 23 converts the electrical energy in the battery 4 into mechanical energy based on the start signal and starts the generator.

[0053] S3: During operation, the control module 1 regulates the output voltage of the generator 3.

[0054] S4: The control module 1 collects the igniter signal and the generator signal, and controls the throttle opening of the carburetor 21 based on the igniter signal and the generator signal, thereby controlling the fuel supply amount and regulating the overall machine speed of the generator 3.

[0055] During automatic idling, the control module 1 receives an external signal or activates the automatic idling function of the generator 3 through default settings. The control module 1 determines the load current by obtaining the voltage at the output terminal of the generator. When the load current is greater than the set value, it controls the throttle opening of the carburetor 21, thereby controlling the fuel supply and regulating the overall speed of the generator 3.

[0056] During frequency switching, the control module 1 receives an external frequency control signal to achieve frequency switching, or sets the rated frequency through internal debugging.

[0057] During overload protection, the control module 1 sets the protection according to the generator 3 with different powers. The generator 3 is loaded with power through a test bench. When the set value is reached, the control module 1 obtains the external protection setting signal, records the overload protection value of the generator 3 to complete the protection setting. The control module 1 sets the protection curve. When the load is greater than the overload protection value, the control module 1 cuts off the external output voltage.

[0058] During load open circuit control, the control module 1 obtains the open circuit control signal and switches the excitation current of the generator 3 based on the open circuit control signal.

[0059] As described above, the above embodiments are only used to introduce the technical solutions of the present invention in detail. However, the descriptions of the above embodiments are only used to help understand the method and its core idea of the present invention, and should not be construed as a limitation of the present invention. Those skilled in the art of this technology can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all of them should be covered within the protection scope of the present invention.

Claims

1. A small generator set control system, characterized in that, Comprising: A control module (1), a power component (2), and a generator (3); the control module (1) is electrically connected to the power component (2), the generator (3), and the output end of the generator (3) respectively, and the control module (1) can receive an external control signal; the power component (2) is connected to the generator (3), and the output end of the generator (3) can supply power to a load.

2. The small generator set control system according to claim 1, wherein, The power component (2) includes a carburetor (21), an igniter (22), and a starting motor (23); the carburetor (21) and the igniter (22) are electrically connected to the control module (1) respectively, and the starting motor (23) is used to start the generator (3).

3. The small generator set control system according to claim 2, characterized in that, The control module (1) includes a voltage regulating and protecting unit (11), a speed regulating unit (12), and a starting control unit (13); the speed regulating unit (12) is electrically connected to the voltage regulating and protecting unit (11), the starting control unit (13), and the carburetor (21) respectively, the voltage regulating and protecting unit (11) is electrically connected to the generator (3) and the output end of the generator (3) respectively, and the starting control unit (13) is electrically connected to the igniter (22) and the starting motor (23) respectively.

4. The small generator set control system according to claim 3, characterized in that It further includes a battery (4), and the battery (4) is electrically connected to the starting motor (23) and the starting control unit (13).

5. The small generator set control system according to claim 4, characterized in that It further includes a charging module (5), the power component (2) further includes a charging coil (24) located on one side of the starting motor (23), and the charging module (5) is electrically connected to the battery (4) and the charging coil (24) respectively.

6. A control method for a small generator set, characterized in that, Implemented by using the small generator set control system as claimed in claim 4 or 5, including the following steps: S1: During startup, the control module (1) sends a startup signal to the starting motor (23); S2: The starting motor (23) converts the electrical energy in the battery (4) into mechanical energy based on the startup signal and starts the generator (3); S3: During operation, the control module (1) regulates the output voltage of the generator (3); S4: The control module (1) collects the igniter signal and the generator signal, and controls the throttle opening of the carburetor (21) based on the igniter signal and the generator signal, thereby controlling the fuel supply amount and regulating the overall machine speed of the generator (3).

7. The control method of the small generator set according to claim 6, characterized in that, It further includes: During automatic idling, the control module (1) receives an external signal or starts the automatic idling function of the generator (3) through default settings. The control module (1) determines the load current by obtaining the voltage at the output end of the generator. When the load current is greater than the set value, the control module (1) controls the throttle opening of the carburetor (21), thereby controlling the fuel supply amount and regulating the overall machine speed of the generator (3).

8. The control method of the small generator set according to claim 6, wherein, It further includes: During frequency switching, the control module (1) receives an external frequency control signal to achieve frequency switching, or sets the rated frequency through internal debugging.

9. The control method of the small generator set according to claim 6, wherein, It further includes: During overload protection, the control module (1) sets protection according to generators (3) with different powers. The generator (3) is loaded with power through a test bench. When the required set value is reached, the control module (1) obtains an external protection setting signal, records the overload protection value of the generator (3) to complete the protection setting. The control module (1) sets a protection curve. When the load is greater than the overload protection value, the control module (1) cuts off the external output voltage.

10. The control method of the small generator set according to claim 6, characterized in that, It further includes: During load open - circuit control, the control module (1) obtains an open - circuit control signal and switches the excitation current of the generator (3) based on the open - circuit control signal, thereby cutting off the output voltage of the generator.

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