CN108880364B - Starting control method of generator - Google Patents
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- CN108880364B CN108880364B CN201810763348.4A CN201810763348A CN108880364B CN 108880364 B CN108880364 B CN 108880364B CN 201810763348 A CN201810763348 A CN 201810763348A CN 108880364 B CN108880364 B CN 108880364B
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000001965 increasing effect Effects 0.000 claims abstract description 28
- 238000012544 monitoring process Methods 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 28
- 230000003287 optical effect Effects 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000004590 computer program Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/08—Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation
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Abstract
The invention discloses a starting control method of a generator, which comprises the following steps: monitoring the running state information of the generator after the generator is started and runs for a first preset time; when current impact signals exist in the generator and the average running power is greater than the preset running power, controlling the rotating speed of the generator to be reduced to a first preset rotating speed, and judging whether short-circuit current signals and overcurrent signals exist in the generator or not; if the short-circuit current signal and the overcurrent signal are not detected, the generator is controlled to operate in a preset load mode for a second preset time until the power value of the generator is increased to the maximum load power value; and adjusting the frequency of the generator to the power frequency according to a preset adjusting mode. The starting control method of the generator provided by the invention can realize normal starting when the generator with lower power supplies power for the motor, and meets the actual application requirements.
Description
Technical Field
The invention relates to the technical field of electrical control, in particular to a starting control method, a starting control device, a readable storage medium and a starting control system of a generator.
Background
In electrical devices, generators are often used in conjunction with motors. It is known that the ac power generated by the generator can be used to operate the motor, so that the actual production can be carried out smoothly. Plays a most important role in the production and life of people.
For the generator, the inverter generator has many advantages of small volume, light weight, good electrical property and the like. In recent years, the development in the field of small engine generators is rapid. The working principle of the existing inverter generator is as follows: a multipolar alternating-current permanent magnet generator is adopted to generate a constant-amplitude alternating current with higher frequency, the alternating current is rectified into a constant direct current by a controllable rectification method, and the constant direct current is converted into the required alternating current by an inverter circuit.
However, in practical applications, if the output power of the generator is smaller, it is difficult to have enough power to output the starting torque to the motor during starting, which results in a problem that the normal starting cannot be performed.
Disclosure of Invention
Therefore, the invention aims to solve the problem that the generator may not be normally started when the generator is started when the generator with lower power supplies power for the motor in the prior art.
The invention provides a starting control method of a generator, wherein the method comprises the following steps:
monitoring running state information of a generator after the generator is started and operates for a first preset time, wherein the running state information at least comprises average running power;
when current impact signals exist in the generator and the average running power is greater than the preset running power, controlling the rotating speed of the generator to be reduced to a first preset rotating speed, and judging whether short-circuit current signals and overcurrent signals exist in the generator or not;
if the short-circuit current signal and the overcurrent signal are not detected, controlling the generator to operate in a preset load mode for a second preset time until the power value of the generator is increased to the maximum load power value;
and adjusting the frequency of the generator to power frequency according to a preset adjusting mode.
The invention provides a starting control method of a generator, which is characterized in that after the generator runs for a first preset time after being started, if a current impact signal exists in the generator and the average running power is greater than the preset running power, the generator supplies power to the motor at the moment, the rotating speed of the generator needs to be reduced at the moment in order to ensure that the generator can be normally started, if a short-circuit current signal and an overcurrent signal are not detected, the generator can also work at the moment, the generator is set to be in a preset low-load mode at the moment, the motor can output larger output starting torque with the same power in the low-load mode, the motor can be normally driven to run, and finally the frequency of the generator is adjusted to the power frequency to reach a stable state. The starting control method of the generator provided by the invention can realize normal starting when the generator with lower power supplies power for the motor, and meets the actual application requirements.
The method for controlling the starting of the generator comprises the following steps:
controlling the generator to operate in the preset load mode for the second preset time;
judging whether the rotating speed of the generator is increased to a second preset rotating speed, wherein the second preset rotating speed is greater than the first preset rotating speed;
and if so, increasing the power value of the generator to the maximum load power value.
The starting control method of the generator, wherein the method for adjusting the frequency of the generator to the power frequency according to the preset adjusting mode comprises the following steps:
after the power value of the generator is increased to a third preset time of the maximum load power value, judging whether a short-circuit current signal and an overcurrent signal exist in the generator or not;
and if the short-circuit current signal and the over-current signal are not detected, adjusting the frequency of the generator to the power frequency.
The starting control method of the generator is characterized in that the first preset time is 2s, and the power value of the preset running power is 25% of the maximum running power value.
The starting control method of the generator is characterized in that the second preset time is 0.5s, and the frequency value of the generator is 25Hz in the preset load mode.
The invention also provides a starting control device of the generator, which comprises a controller, wherein the controller comprises an operation monitoring module, a first control module, a second control module and a frequency adjusting module which are sequentially connected;
the operation monitoring module is used for monitoring the operation state information of the generator after the generator is started up and operates for a first preset time, wherein the operation state information at least comprises average operation power;
the first control module is used for controlling the rotating speed of the generator to be reduced to a first preset rotating speed and judging whether a short-circuit current signal and an overcurrent signal exist in the generator or not when the current impact signal exists in the generator and the average running power is greater than the preset running power;
the second control module is configured to control the generator to operate in a preset load mode for a second preset time until the power value of the generator is increased to a maximum load power value if the short-circuit current signal and the overcurrent signal are not detected;
and the frequency adjusting module is used for adjusting the frequency of the generator to the power frequency according to a preset adjusting mode.
The starting control device of the generator is characterized in that the controller is electrically connected with a rotating speed detection module, the rotating speed detection module comprises a first optical coupler, a first end of the first optical coupler is electrically connected with one end of a first contact pin and a negative electrode of a first diode respectively, an anode of the first diode and a second end of the first optical coupler are connected with one ends of two first resistors which are connected in series, the other end of the first resistors which are connected in series is electrically connected with a second contact pin, a first capacitor is arranged between a connecting point between the two first resistors and the first contact pin, a third end of the first optical coupler is electrically connected with one end of a second capacitor, the third end of the first optical coupler and the second capacitor are grounded, and the other end of the second capacitor is connected with a fourth end of the first optical coupler; the fourth end of first opto-coupler and the one end electric connection of second resistance, the other end and the third contact pin electric connection of second resistance, the one end of third contact pin and the one end electric connection of third electric capacity, the other end ground connection of third electric capacity.
The starting control device of the generator is characterized in that the controller is electrically connected with an overcurrent and overheat protection module, and the overcurrent and overheat protection module comprises an overcurrent calculation unit, a short-circuit protection unit and an overheat protection unit which are sequentially connected.
The invention also proposes a readable storage medium on which a computer program is stored, wherein said program, when executed by a processor, implements a method of controlling the starting of a generator as described above.
The invention also provides a starting control system of the generator, which comprises an electric motor and the generator for supplying power to the electric motor, wherein the generator executes the following steps when being started:
monitoring running state information of a generator after the generator is started and operates for a first preset time, wherein the running state information at least comprises average running power;
when current impact signals exist in the generator and the average running power is greater than the preset running power, controlling the rotating speed of the generator to be reduced to a first preset rotating speed, and judging whether short-circuit current signals and overcurrent signals exist in the generator or not;
if the short-circuit current signal and the overcurrent signal are not detected, controlling the generator to operate in a preset load mode for a second preset time until the power value of the generator is increased to the maximum load power value;
and adjusting the frequency of the generator to power frequency according to a preset adjusting mode.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a start control method of a generator according to a first embodiment of the present invention;
fig. 2 is a flowchart of a start-up control method of a generator according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a controller in a starting control device of a generator according to a third embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a start control device of a generator according to a fourth embodiment of the present invention;
FIG. 5 is a circuit diagram of a rotational speed detection module in the start-up control apparatus of the generator shown in FIG. 4;
FIG. 6 is an electrical schematic diagram of an overcurrent and overheat protection module in the start-up control device of the generator shown in FIG. 4;
FIG. 7 is a circuit diagram of the over-current calculating unit of FIG. 6;
FIG. 8 is a circuit diagram of the short protection unit of FIG. 6;
fig. 9 is a circuit diagram of the overheating protection unit in fig. 6.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must be in a particular orientation, constructed or operated in a particular manner, and is not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In practical applications, if the output power of the generator is small, it is difficult to have sufficient power to output the starting torque to the motor during starting, which results in the problem of abnormal starting. Specifically, since there is no back electromotive force before the motor is started, the current required for 10 cycles (0.2 second) at the start of the motor is 7 to 10 times the current required for normal operation. Typically, if the generator does not have sufficient power output, the motor will then directly drag the generator off or enter a protected mode (especially with a heavy-duty start). This is an inductive load, such as an electric machine, causing the generator to enter a specific state,
when the generator just enters the state, the rotating speed rapidly drops, the speed of the generator needs to be increased,
the condition for the generator speed to ramp back up is a limit on power. When the speed of the generator is increased, a load starting process of the motor is performed. However, in some cases, when the motor is at full load starting power frequency (50 Hz or 60 Hz), it is difficult to have enough power to output starting torque to the motor if the generator is not too high.
In order to solve the technical problem, the invention provides a starting control method of a generator, wherein the method comprises the following steps:
s101, monitoring the running state information of the generator after the generator is started up and runs for a first preset time, wherein the running state information at least comprises average running power.
After the generator is started, the time delay function is realized when the generator runs for the first preset time, so that the normal starting of the generator is ensured as far as possible. In this embodiment, the first predetermined time is 2 s. During the operation of the generator, the operation state of the generator is monitored, wherein the operation state of the generator comprises the average operation power value of the generator and the monitoring whether the current surge signal exists.
S102, when it is monitored that a current surge signal exists in the generator and the average running power is larger than a preset running power, controlling the rotating speed of the generator to be reduced to a first preset rotating speed, and judging whether a short-circuit current signal and an overcurrent signal exist in the generator.
In this step, if a current surge signal is detected in the generator, and the average operating power during operation is greater than the preset operating power. The generator is used to drive the motor to operate. In this embodiment, the power value of the preset operation power is 25% of the maximum operation power value of the generator.
In practical production applications, manufacturers typically purchase a slightly lower generator power than the motor that needs to be powered in order to reduce cost budget. Therefore, in the starting process of the generator driving the motor, the motor directly drags the generator to stop or protect the generator at the moment due to insufficient power of the generator. In this step, the rotation speed of the generator is rapidly reduced, even directly reduced to 0, and the rotation is stopped. After the rotational speed of the generator is rapidly reduced, it is determined whether a short-circuit current signal and an overcurrent signal are present in the generator. It should be noted here that this is provided primarily to confirm whether the generator can continue to operate. It can be understood that if the short-circuit current signal and the over-current signal are detected, the generator cannot continue to operate at this time, and the special protection mode is directly entered.
And S103, if the short-circuit current signal and the overcurrent signal are not detected, controlling the generator to operate in a preset load mode for a second preset time until the power value of the generator is increased to the maximum load power value.
As described above, when the short-circuit current signal and the over-current signal are not detected, it is indicated that the generator can still operate. In this case, in order to make the generator output a larger starting output torque, the frequency of the generator needs to be adjusted to a low frequency mode. In this embodiment, the frequency value corresponding to the low frequency mode is 25Hz, and the frequency value of 25Hz is used for 0.5 s.
When the generator is controlled to operate in a low-frequency state, whether the rotation speed of the generator rises back is judged. If the rotation speed of the generator is increased again, the power value of the generator can be increased to the maximum load power value of the generator. The arrangement is mainly to ensure that the generator outputs enough output starting torque to ensure the normal starting of the motor.
And S104, adjusting the frequency of the generator to the power frequency according to a preset adjusting mode.
Unnecessary load damage may result due to too low a frequency of diversification of the generator load. For example, the load frequency of the industrial frequency transformer is too low, and the transformer can be heated or burnt out after a long time. When the motor rotates and accelerates, the motor has a certain rotating speed and then has back electromotive force. The higher the rotation speed of the motor, the larger the back electromotive force is, the smaller the required power is, the current is continuously reduced, and then the frequency voltage power is continuously adjusted by the system until the starting is finished.
In this step, after the power value of the generator is increased to the maximum load power value and continues for a third preset time (0.1 s), it is determined whether a short-circuit current signal and an overcurrent signal exist in the generator.
If the short-circuit current signal and the overcurrent signal are not detected, the generator can still normally operate, the frequency of the generator is adjusted to power frequency, and the motor is finally started after the frequency is stabilized.
The invention provides a starting control method of a generator, which is characterized in that after the generator runs for a first preset time after being started, if a current impact signal exists in the generator and the average running power is greater than the preset running power, the generator supplies power to the motor at the moment, the rotating speed of the generator needs to be reduced at the moment in order to ensure that the generator can be normally started, if a short-circuit current signal and an overcurrent signal are not detected, the generator can also work at the moment, the generator is set to be in a preset low-load mode at the moment, the motor can output larger output starting torque with the same power in the low-load mode, the motor can be normally driven to run, and finally the frequency of the generator is adjusted to the power frequency to reach a stable state. The starting control method of the generator provided by the invention can realize normal starting when the generator with lower power supplies power for the motor, and meets the actual application requirements.
The technical solution of the present invention is explained in more detail below with a specific example. Referring to fig. 2, a method for controlling the starting of a generator according to a second embodiment of the present invention includes the following steps:
s201, whether the generator is started normally or not.
The generator is first turned on. It should be noted that the term "normal start" in this step refers to normal operation, and the generator is not already in a stable operation state.
And S202, the generator rotates for 2S in a delayed mode.
If the generator normally operates, the time delay function is realized when the generator operates for the first preset time. In this step, the first predetermined time is 2 s.
And S203, a generator special starting switch.
In this step, if a special start switch of the generator is turned on, the generator can be controlled according to the start control method provided by the present invention. Namely, if the generator is short-circuited, overcurrent and overheated, the generator can enter a shutdown protection state; if the generator is normally operated, the power can be normally supplied to the motor with larger power according to the starting control method provided by the invention.
And S204, judging whether the generator has current impact or not.
And S205, the average power of the generator is more than 25%.
And when the current impact exists in the generator, continuously judging whether the average running power of the generator is more than 25% of the maximum running power value of the generator. If yes, the generator is used for driving the motor to operate. Since in practical production applications, manufacturers typically purchase a slightly lower generator power than the motor that needs to be powered in order to reduce cost budget. Therefore, in the starting process of the generator driving the motor, the motor directly drags the generator to stop or protect the generator at the moment due to insufficient power of the generator.
And S206, the power generation enters a special starting mode, and the rotating speed of the generator is reduced.
To obtain a greater output starting torque, the generator is under-powered. In this step, the rotation speed of the generator needs to be controlled to rapidly decrease, even directly decrease to 0, to stop rotating.
S207, whether the generator is short-circuited and overcurrent or not.
The detection of whether the generator has short circuit and overcurrent is mainly used for confirming whether the generator can continue to operate. It can be understood that if the short-circuit current signal and the over-current signal are detected, the generator cannot continue to operate at this time, and the special protection mode is directly entered. That is, the process proceeds to step S208, where the generator off output is put into standby.
And S208, closing the output and entering standby.
S209, the generator enters a low-frequency load mode.
If the short-circuit current signal and the over-current signal are not detected in the generator, the generator can still continue to operate at the moment. In order to obtain larger output starting torque, the normal starting of the motor is ensured. The generator is now set to a low frequency load mode, in which the preferred low frequency is 25Hz and is run at this 25Hz frequency value for 0.5 s. Practical experiments prove that when the rotating speed of the motor is 0 and the frequency of the generator is 25Hz, the same power can output 4 times of output starting torque.
And S210, judging whether the rotating speed of the generator rises again or not.
Because the output starting torque of the generator is increased at the moment, the rotating speed of the corresponding generator is supposed to gradually rise. If the rotation speed of the generator does not rise back at this time, it is assumed that the generator is in failure, and the process similarly proceeds to step S208 described above to enter the shutdown protection mode.
And S211, increasing the power to the maximum load power.
And controlling the power of the generator to increase to the maximum load power during the process of the rotating speed of the generator rising. It will be appreciated that increasing the power of the generator to the maximum load power increases the output torque of the generator.
S212, delaying for 0.1S, and increasing the frequency adjustment voltage and power.
As described above, the generator corresponds to a frequency of 25Hz in the low frequency load mode, wherein setting the frequency of the generator to 25Hz is primarily intended to cause the generator to output a greater starting torque. When the rotating speed of the motor is gradually increased under the driving of the generator, the corresponding output starting torque of the generator can be properly reduced. In this step, the operating frequency of the generator is increased and the voltage and power are adjusted simultaneously with 0.1S as an adjustment period.
S213, whether the generator is short-circuited and over-current.
If a short-circuit current signal and an overcurrent signal are detected, the generator can not continue to work at the moment, and the special protection mode is directly entered. That is, the process proceeds to step S208, where the generator off output is put into standby. If the short-circuit current signal and the overcurrent signal are not detected, the generator can still normally operate, the frequency of the generator is adjusted to power frequency, and the motor is finally started after the frequency is stabilized.
And S214, judging whether the generator frequency reaches the power frequency.
Unnecessary load damage may result due to too low a frequency of diversification of the generator load. For example, the load frequency of the industrial frequency transformer is too low, and the transformer can be heated or burnt out after a long time. When the motor rotates and accelerates, the motor has a certain rotating speed and then has back electromotive force. The higher the rotation speed of the motor is, the larger the back electromotive force is, the smaller the power provided by the required generator is, at the moment, the current continuously drops, and then the frequency voltage power is continuously adjusted by the system to reach a power balance state until the starting is finished. In this step, whether the generator reaches the power frequency state is mainly judged, and corresponding adjustment is performed according to the working state of the generator, so that the generator is protected to the greatest extent.
S215, delaying by 0.5S.
If the frequency of the generator does not reach the power frequency, it means that the generator is not in the most stable working state at this time, and there is a possibility of short circuit or overcurrent. To solve this problem, in this step, the frequency of the generator is adjusted at intervals of 0.1S until the frequency of the generator reaches the power frequency. Meanwhile, if the frequency of the generator reaches the power frequency, in order to ensure the accuracy of the judgment result, in the step, the judgment mode exits with 0.5S delay.
Referring to fig. 3, a start control device of a generator according to a third embodiment of the present invention includes a controller, wherein the controller includes an operation monitoring module 301, a first control module 302, a second control module 303, and a frequency adjusting module 304, which are connected in sequence;
the operation monitoring module 301 is specifically configured to:
monitoring running state information of a generator after the generator is started and operates for a first preset time, wherein the running state information at least comprises average running power;
the first control module 302 is specifically configured to:
when current impact signals exist in the generator and the average running power is greater than the preset running power, controlling the rotating speed of the generator to be reduced to a first preset rotating speed, and judging whether short-circuit current signals and overcurrent signals exist in the generator or not;
the second control module 303 is specifically configured to:
if the short-circuit current signal and the overcurrent signal are not detected, controlling the generator to operate in a preset load mode for a second preset time until the power value of the generator is increased to the maximum load power value;
the frequency adjustment module 304 is specifically configured to:
and adjusting the frequency of the generator to power frequency according to a preset adjusting mode.
Referring to fig. 4 to 9, a start control device for a generator according to a fourth embodiment of the present invention includes a controller 30, a rotation speed detecting module 31 electrically connected to the controller 30, and an overcurrent and overheat protection module 32.
Referring to fig. 5, the rotation speed detecting module 31 includes a first optocoupler 310, a first end of the first optocoupler 310 is electrically connected to a first pin 311 and a negative electrode of a first diode 315, a positive electrode of the first diode 315 and a second end of the first optocoupler 310 are connected to one ends of two first resistors 313 connected in series, the other end of the first resistor 313 connected in series is electrically connected to a second pin 312, a first capacitor 314 is disposed between a connection point between the two first resistors 313 and the first pin 311, a third end of the first optocoupler 310 is electrically connected to one end of a second capacitor 316, the third end of the first optocoupler 310 and the second capacitor 316 are grounded, and the other end of the second capacitor 316 is connected to a fourth end of the first optocoupler 310; the fourth end of the first optocoupler 310 is electrically connected to one end of the second resistor 317, the other end of the second resistor 317 is electrically connected to the third pin 318, one end of the third pin 318 is electrically connected to one end of the third capacitor 319, and the other end of the third capacitor 319 is grounded. The rotation speed detection module 31 is mainly used for monitoring the rotation speed of the generator in real time.
Referring to fig. 6, the over-current and over-temperature protection module 32 includes an over-current calculation unit 321, a short-circuit protection unit 322, and an over-temperature protection unit 323 connected in sequence.
Referring to fig. 7, the over-current calculating unit 321 includes a first comparator 3210, a first end of the first comparator 3210 is electrically connected to a pin 3211, a second end of the first comparator 3210 is electrically connected to a capacitor 3212 and a capacitor 3215, one end of the capacitor 3215 is connected to a pin 3216, a third end of the first comparator 3210 is connected to a resistor 3203 and a resistor 3217 which are connected in series, and a capacitor 3213 and a pin 3217 are connected to an electrical connection point between the resistor 3203 and the resistor 3217. The fourth terminal of the first comparator 3210 is electrically connected to the resistor 3218 and the resistor 3219, and one end of the resistor 3218 is grounded. One end of the resistor 3219 is electrically connected to the pin 3211. The fifth terminal of the first comparator 3210 is electrically connected to the pin 3201 and the capacitor 3202, and one terminal of the capacitor 3202 is grounded.
Referring to fig. 8, the short-circuit protection unit 322 includes a second comparator 3220, a first end of the second comparator 3220 is electrically connected to the pin 3221, a second end of the second comparator 3220 is electrically connected to the resistor 3222 and the capacitor 3227, an end of the resistor 3222 is electrically connected to the pin 3223, a third end of the second comparator 3220 is electrically connected to the resistor 3224 and the resistor 3225, an end of the resistor 3224 is grounded, and an end of the resistor 3225 is electrically connected to the pin 3226.
Referring to fig. 9, the overheating protection unit 323 includes a third comparator 3230, a first end of the third comparator 3230 is grounded, a second end of the third comparator 3230 is electrically connected to a resistor 3232 and a resistor 3233, an end of the resistor 3233 is electrically connected to a pin 3234, and an end of the resistor 3232 is grounded. The third end of the third comparator 3230 is electrically connected to the thermistor 3236, the resistor 3238 and the capacitor 3239, one end of the thermistor 3236 is electrically connected to the pin 3235, a capacitor 3237 is connected to a connection point between the pin 3235 and the thermistor 3236, and one ends of the capacitor 3237, the resistor 3238 and the capacitor 3239 are all grounded. One end of the capacitor 3239 is connected to the capacitor 3240, and one end of the capacitor 3240 is electrically connected to the pin 3241.
The invention also proposes a readable storage medium on which a computer program is stored, wherein said program, when executed by a processor, implements a method of controlling the starting of a generator as described above.
The invention also provides a starting control system of the generator, which comprises an electric motor and the generator for supplying power to the electric motor, wherein the generator executes the following steps when being started:
monitoring running state information of a generator after the generator is started and operates for a first preset time, wherein the running state information at least comprises average running power;
when current impact signals exist in the generator and the average running power is greater than the preset running power, controlling the rotating speed of the generator to be reduced to a first preset rotating speed, and judging whether short-circuit current signals and overcurrent signals exist in the generator or not;
if the short-circuit current signal and the overcurrent signal are not detected, controlling the generator to operate in a preset load mode for a second preset time until the power value of the generator is increased to the maximum load power value;
and adjusting the frequency of the generator to power frequency according to a preset adjusting mode.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for controlling the start-up of a generator, the method comprising the steps of:
monitoring running state information of a generator after the generator is started and operates for a first preset time, wherein the running state information at least comprises average running power;
when current impact signals exist in the generator and the average running power is greater than the preset running power, controlling the rotating speed of the generator to be reduced to a first preset rotating speed, and judging whether short-circuit current signals and overcurrent signals exist in the generator or not;
if the short-circuit current signal and the overcurrent signal are not detected, controlling the generator to operate in a preset load mode for a second preset time until the power value of the generator is increased to the maximum load power value;
and adjusting the frequency of the generator to power frequency according to a preset adjusting mode.
2. The method for controlling starting of a generator according to claim 1, wherein the method for controlling the generator to operate in the preset load mode for a second preset time until the power value of the generator is increased to the maximum load power value comprises the steps of:
controlling the generator to operate in the preset load mode for the second preset time;
judging whether the rotating speed of the generator is increased to a second preset rotating speed, wherein the second preset rotating speed is greater than the first preset rotating speed;
and if so, increasing the power value of the generator to the maximum load power value.
3. The method for controlling the starting of an electric generator according to claim 2, wherein the method for adjusting the frequency of the electric generator to the power frequency according to the preset adjustment mode comprises the following steps:
after the power value of the generator is increased to a third preset time of the maximum load power value, judging whether a short-circuit current signal and an overcurrent signal exist in the generator or not;
and if the short-circuit current signal and the over-current signal are not detected, adjusting the frequency of the generator to the power frequency.
4. The method of claim 2, wherein the first predetermined time is 2s, and the predetermined operation power has a power value of 25% of a maximum operation power value.
5. The method of claim 4, wherein the second predetermined time is 0.5s, and the frequency value of the generator is 25Hz in the predetermined load mode.
6. A starting control device of a generator comprises a controller, and is characterized in that the controller comprises an operation monitoring module, a first control module, a second control module and a frequency adjusting module which are sequentially connected;
the operation monitoring module is used for monitoring the operation state information of the generator after the generator is started up and operates for a first preset time, wherein the operation state information at least comprises average operation power;
the first control module is used for controlling the rotating speed of the generator to be reduced to a first preset rotating speed and judging whether a short-circuit current signal and an overcurrent signal exist in the generator or not when the current impact signal exists in the generator and the average running power is greater than the preset running power;
the second control module is configured to control the generator to operate in a preset load mode for a second preset time until the power value of the generator is increased to a maximum load power value if the short-circuit current signal and the overcurrent signal are not detected;
and the frequency adjusting module is used for adjusting the frequency of the generator to the power frequency according to a preset adjusting mode.
7. The start-up control device of a generator according to claim 6, characterized in that: the controller is electrically connected with a rotation speed detection module, the rotation speed detection module comprises a first optical coupler, a first end of the first optical coupler is electrically connected with one end of a first contact pin and a negative electrode of a first diode respectively, a positive electrode of the first diode and a second end of the first optical coupler are connected with one ends of two first resistors which are connected in series, the other ends of the first resistors which are connected in series are electrically connected with a second contact pin, a first capacitor is arranged between a connecting point between the two first resistors and the first contact pin, a third end of the first optical coupler is electrically connected with one end of a second capacitor, the third end of the first optical coupler and the second capacitor are grounded, and the other end of the second capacitor is connected with a fourth end of the first optical coupler; the fourth end of first opto-coupler and the one end electric connection of second resistance, the other end and the third contact pin electric connection of second resistance, the one end of third contact pin and the one end electric connection of third electric capacity, the other end ground connection of third electric capacity.
8. The generator start-up control device of claim 6, wherein the controller is electrically connected to an overcurrent and overheat protection module, and the overcurrent and overheat protection module comprises an overcurrent calculation unit, a short-circuit protection unit and an overheat protection unit which are connected in sequence.
9. A readable storage medium on which a computer program is stored, wherein the program, when executed by a processor, implements the method of controlling the start-up of a generator according to any one of claims 1 to 5.
10. A start-up control system for a generator comprising an electric motor and a generator for supplying power to said motor, characterized in that said generator, when started, performs the steps of:
monitoring running state information of a generator after the generator is started and operates for a first preset time, wherein the running state information at least comprises average running power;
when current impact signals exist in the generator and the average running power is greater than the preset running power, controlling the rotating speed of the generator to be reduced to a first preset rotating speed, and judging whether short-circuit current signals and overcurrent signals exist in the generator or not;
if the short-circuit current signal and the overcurrent signal are not detected, controlling the generator to operate in a preset load mode for a second preset time until the power value of the generator is increased to the maximum load power value;
and adjusting the frequency of the generator to power frequency according to a preset adjusting mode.
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Denomination of invention: A Starting Control Method for Generators Effective date of registration: 20231103 Granted publication date: 20200512 Pledgee: Zhejiang Tailong commercial bank Taizhou branch of Limited by Share Ltd. Pledgor: TAIZHOU QINGLONG MACHINERY & ELECTRIC CO.,LTD. Registration number: Y2023980063788 |