CN114123747A - Method and device for starting impact load - Google Patents
Method and device for starting impact load Download PDFInfo
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- CN114123747A CN114123747A CN202111425141.4A CN202111425141A CN114123747A CN 114123747 A CN114123747 A CN 114123747A CN 202111425141 A CN202111425141 A CN 202111425141A CN 114123747 A CN114123747 A CN 114123747A
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- inverter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
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Abstract
The present disclosure relates to the field of inverter control technology. A method of initiating an impact load, comprising: the method comprises the steps of obtaining the output power of a current inverter, judging whether the output power of the inverter is higher than a first preset limiting power, and if the output power of the inverter is higher than the first preset limiting power, controlling the inverter to output by taking the preset output power as the maximum limiting value of the output power of the inverter, wherein the preset output power is smaller than the first preset limiting power. When the output power of the inverter is higher than the first preset limiting power, the high-power impact load is connected. According to the technical scheme, the output power of the inverter is maintained within the set power by limiting the output power of the inverter, so that the output power of the inverter is maintained within a safe value, and the peak power requirement when an impact load is started instantly is avoided. Customers do not need to purchase high-power inverters any more, and the purchase cost, the occupied space and the self energy consumption are smaller.
Description
Technical Field
The present disclosure relates to the field of inverter control technology.
Background
An inverter is a converter for converting direct current into alternating current.
With the concept of low carbon and green, solar equipment gradually enters each household, and a customer needs to purchase a proper inverter to output a direct current power supply generated by the solar equipment as alternating current to supply to a load at home.
But the household load is various and complicated. Therefore, when a user purchases the inverter, the user needs to purchase the high-power inverter to prevent the impact which is several times higher than the rated power of the inverter when the impact load is connected, and even the machine is exploded. The so-called impact load is some equipment, such as an air conditioner, a water pump and the like, with the power being multiplied higher than that in normal operation when the equipment is started.
However, after the impulsive load is started, the load power of the inverter is reduced a lot, so that the performance of the inverter purchased by many users cannot be reasonably utilized, resulting in wasted performance, and the purchase cost, the occupied space and the energy consumption of the inverter with larger rated power are larger.
Disclosure of Invention
In order to solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides a method and an apparatus for starting an impact load, which enable a low-power inverter to start a high-power impact load, and the acquisition cost, the space occupation, and the energy consumption of the inverter are smaller.
In a first aspect, the present disclosure provides a method of initiating an impact load, comprising:
the current output power of the inverter is obtained,
judging whether the current output power of the inverter is higher than a first preset limiting power,
and if the current output power of the inverter is higher than the first preset limiting power, controlling the inverter to output by taking the preset output power as the maximum limiting value of the output power of the inverter, wherein the preset output power is less than or equal to the first preset limiting power.
Further, the method also comprises the following steps:
and if the current output power of the inverter is smaller than a second preset limiting power, the inverter outputs according to the power requirement of the load, wherein the second preset limiting power is smaller than the first preset power and is smaller than or equal to the preset output power.
Further, if the current output power of the inverter is greater than or equal to a second preset limit power, returning to the following steps:
and controlling the inverter to output by taking the preset output power as the maximum limit value of the output power of the inverter.
Further, the current output power of the inverter is higher than the first preset limit power, or the inverter outputs according to the load power, and then the following steps are returned:
the output power of the inverter is retrieved,
and judging whether the current output power of the inverter is higher than a first preset limiting power or not.
Further, the inverter controls the output voltage of the inverter to output the preset output power.
Further, the first preset limit power is 130% of the rated power of the inverter.
Further, the preset output power is the rated power of the inverter.
Further, the second preset limit power is the rated power of the inverter.
In a second aspect, the present disclosure further provides a device for starting an impact load, including an inverter, a detection module for detecting an output power of the inverter and an output power control module for controlling the inverter, where the detection module is connected to the control module to transmit the output power of the inverter to the control module, and when the output power of the inverter is higher than a first preset limit power, the control module controls the inverter to output with the preset output power as a maximum limit value of the output power of the inverter, where the preset output power is smaller than the first preset limit power.
Further, when the output power of the inverter is smaller than a second preset limit power, the control module controls the inverter to output according to the power requirement of the external load, and the second preset limit power is smaller than the preset output power.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
when the output power of the inverter is higher than the first preset limiting power, the high-power impact load is connected. According to the technical scheme, the output power of the inverter is limited, the output of the inverter is maintained in the set power, the inverter is prevented from still performing voltage stabilization operation after the impact load is connected, and the phenomenon that the inverter is burnt can be avoided. By maintaining the output power of the inverter within a safe value, the external impact load can be slowly started after being connected, and the peak power requirement of the impact load during instant starting is avoided. According to the technical scheme, the peak power requirement after the impact load is connected is averaged by the method for controlling the output power of the inverter, a customer does not need to purchase a high-power inverter any more, and the purchase cost, the space occupation and the self energy consumption are smaller.
Drawings
FIG. 1 is a logic block diagram of a method of initiating an impulsive load according to an embodiment of the disclosure;
FIG. 2 is a flow chart of a method of initiating an impact load according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an apparatus for initiating an impact load according to an embodiment of the present disclosure.
Wherein, 1, an inverter; 2. a detection module; 3. and a control module.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Fig. 1 is a logic block diagram of a method for starting an impact load according to an embodiment of the present disclosure, and fig. 2 is a flowchart of the method for starting an impact load according to an embodiment of the present disclosure, which is used for controlling an inverter to start an impact load.
As shown in fig. 1 and 2, the method for starting the impact load includes:
s1 obtaining the current output power of the inverter,
s2, judging whether the current output power of the inverter is higher than the first preset limit power,
and S3, if the current output power of the inverter is higher than the first preset limit power, controlling the inverter to output to the load by taking the preset output power as the maximum limit value of the output power of the inverter.
Otherwise, the current output power of the inverter continues to be detected, i.e., the step returns to S1.
And after the step of controlling the inverter to output to the load by taking the preset output power as the maximum limit value of the output power of the inverter is executed, detecting the output power of the inverter, outputting by the inverter according to the power requirement of the load if the output power of the inverter is smaller than the second preset limit power, and returning to the step of S1.
And if not, continuously keeping the preset output power as the maximum limit value of the output power of the inverter to control the inverter to output.
In this embodiment, the first preset limit power is 130% of a rated power of the inverter, the preset output power is the rated power of the inverter, and the second preset limit power is the rated power of the inverter. In other embodiments, the first preset limit power may be determined according to the model of the inverter, for example, if the inverter a can be safely operated in a range exceeding 120% of the rated power through testing, the first preset limit power may be set to 120% of the rated power of the inverter. The preset output power may be any value below the first preset limit power, the second preset limit power may be any value below the first preset limit power, and the second preset limit power is required to be less than or equal to the preset output power. In addition, if the second preset limiting power is set to be a value slightly lower than the rated power of the inverter, the redundancy of the system can be increased, and the impact load is ensured to be completely started.
Specifically, after the impulsive load is started, the inverter automatically tracks the power demand of the load, resulting in an increase in the output power of the inverter. At this time, if it is detected that the output power of the inverter exceeds the first preset limit power, that is, the output power of the inverter exceeds 130% of the rated power of the inverter, it indicates that the inverter cannot provide sufficient output power for the load under safe conditions.
And controlling the inverter to output to the load by taking the preset output power as the maximum limit value of the output power of the inverter, namely controlling the inverter to take the rated power of the inverter as the maximum limit value, and reducing the voltage output to the load by the inverter so as to maintain the total power output to the load by the inverter below the preset output power. For example, when a shock load is connected, if the inverter still keeps outputting 220V to the outside, the output power will exceed the range that the inverter can carry, and the inverter will be caused to explode. According to the technical scheme, the voltage output to the outside is reduced, for example, the voltage output to the outside is reduced to 190V, so that the power output to the outside is reduced to be lower than the preset output power.
Generally, in the process of starting the impact load, the inverter keeps the preset output power to be continuously output to the outside, and the preset output power is set as the rated power of the inverter so as to ensure that the inverter cannot be damaged at the maximum probability.
When the impact load is started, the power required by the load end is gradually reduced, the output power of the inverter is also reduced, and when the output power of the inverter is smaller than the second preset limiting power, the inverter can normally bear the load. And at the moment, the inverter can be controlled to output according to the power requirement of the load, and the second preset limiting power is smaller than the preset output power. For example, the preset output power is 6000W, the second preset limit power is 5000W, and it is detected that the output power of the inverter is not maintained at 6000W, but a drop starts to occur until the output power drops below 5000W, which indicates that the external impact load has been started, that is, the power output limit of the inverter can be temporarily cancelled, so that the inverter can freely track the required power of the load to output. Timely cancellation of power output limitations on the inverter may enable the inverter system to maintain normal voltage startup after encountering some heavy load accesses. For example, after the large load B is connected, if the output power of the inverter is greater than the preset output power and smaller than the first preset limiting power, if the limitation is not cancelled, the inverter maintains the preset output power to output, and at this time, the voltage is low, and the start of the load B is slow. However, if the limitation is removed, the inverter can be started quickly for the large load B in a safer range, i.e., in the range of the first preset power limit.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an apparatus for starting an impact load according to an embodiment of the present disclosure, where the apparatus for starting an impact load includes an inverter 1, a detection module 2, and a control module 3.
The detection module 2 is used for detecting the output power of the inverter 1, the control module 3 is used for controlling the output power of the inverter 1, the detection module 2 is connected to the control module 3 so as to transmit the output power of the inverter 1 to the control module 3, when the output power of the inverter 1 is higher than a first preset limit power, the control module 3 controls the inverter 1 to output by taking the preset output power as the maximum limit value of the output power of the inverter 1, and the preset output power is smaller than the first preset limit power. When the output power of the inverter 1 is smaller than a second preset limit power, the control module 3 controls the inverter 1 to output according to the power requirement of the external load, and the second preset limit power is smaller than the preset output power. The first preset limiting power is 130% of the rated power of the inverter 1, the preset output power is the rated power of the inverter 1, and the second preset limiting power is the rated power of the inverter 1.
Specifically, the detection module 2 is an output power detection circuit in the prior art, and is composed of a voltage sensor for measuring the voltage across the inverter 1 and a current sensor for measuring the output current of the inverter 1. The control module 3 comprises an MCU and a computer readable storage medium, which stores a computer program that, when executed, implements the method of initiating an impact load as described in fig. 1. The control module 3 transmits a voltage signal to be maintained to the inverter 1, and the inverter 1 further regulates and controls the voltage output by the inverter 1 according to the voltage signal, so that the logic that the whole control module 3 controls the inverter 1 to output according to the power requirement of an external load is realized. How the inverter 1 regulates its own output voltage is the prior art, and is not described herein again.
In summary, the method and the device for starting the impact load provided by the embodiment of the disclosure maintain the output power of the inverter within the set power through the limited output power, so that the inverter is prevented from performing voltage stabilization operation after the impact load is connected, and the inverter can be prevented from being burnt. By maintaining the output power of the inverter within a safe value, the external impact load can be slowly started after being connected, and the peak power requirement generated when the impact load is started instantly is avoided. According to the technical scheme, the peak power requirement after the impact load is connected is averaged by the method for controlling the output power of the inverter, a customer does not need to purchase a high-power inverter any more, and the purchase cost, the space occupation and the self energy consumption are smaller.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of initiating an impact load, comprising:
the current output power of the inverter is obtained,
judging whether the current output power of the inverter is higher than a first preset limiting power,
and if the current output power of the inverter is higher than the first preset limiting power, controlling the inverter to output by taking the preset output power as the maximum limiting value of the output power of the inverter, wherein the preset output power is less than or equal to the first preset limiting power.
2. The method of initiating an impact load of claim 1, further comprising:
and if the current output power of the inverter is smaller than a second preset limiting power, the inverter outputs according to the power requirement of the load, wherein the second preset limiting power is smaller than the first preset power and is smaller than or equal to the preset output power.
3. The method of claim 2, wherein if the current inverter output power is greater than or equal to a second predetermined limit power, the method returns to the following steps:
and controlling the inverter to output by taking the preset output power as the maximum limit value of the output power of the inverter.
4. The method of claim 2, wherein if the current output power of the inverter is higher than the first predetermined limit power or the inverter outputs the load power, the method returns to the following steps:
the current output power of the inverter is re-acquired,
and judging whether the current output power of the inverter is higher than a first preset limiting power or not.
5. The method of starting an impulsive load as defined in claim 1, wherein the inverter controls an output voltage of the inverter to achieve an output of a preset output power.
6. The method of starting an impulsive load as defined in claim 1, in which the first preset limit power is 130% of the rated power of the inverter.
7. The method of starting an impact load according to claim 1, wherein said preset output power is a rated power of an inverter.
8. The method of starting an impact load according to claim 2, characterized in that said second preset limit power is the rated power of the inverter.
9. The device for starting the impact load comprises an inverter and is characterized by further comprising a detection module for detecting the output power of the inverter and an output power control module for controlling the inverter, wherein the detection module is connected with the control module to transmit the output power of the inverter to the control module, when the output power of the inverter is higher than a first preset limit power, the control module controls the inverter to output by taking the preset output power as the maximum limit value of the output power of the inverter, and the preset output power is smaller than the first preset limit power.
10. The apparatus of claim 7, wherein the control module controls the inverter to output according to the power requirement of the external load when the output power of the inverter is less than a second predetermined limit power, and the second predetermined limit power is less than the predetermined output power.
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| CN202111425141.4A CN114123747A (en) | 2021-11-26 | 2021-11-26 | Method and device for starting impact load |
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| CN202111425141.4A CN114123747A (en) | 2021-11-26 | 2021-11-26 | Method and device for starting impact load |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115603430A (en) * | 2022-11-16 | 2023-01-13 | 浙江动一新能源动力科技股份有限公司（Cn） | Portable electric energy storage system and power adjusting method thereof |
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2021
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| US20150085542A1 (en) * | 2013-09-26 | 2015-03-26 | Delta Electronics, Inc. | Micro inverter of solar power system and method of operating the same |
| CN106849179A (en) * | 2017-04-18 | 2017-06-13 | 阳光电源股份有限公司 | Photovoltaic generation control method and photovoltaic plant |
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