CN113063984B - Load identification device, identification method and system - Google Patents
Load identification device, identification method and system Download PDFInfo
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- CN113063984B CN113063984B CN202110279785.0A CN202110279785A CN113063984B CN 113063984 B CN113063984 B CN 113063984B CN 202110279785 A CN202110279785 A CN 202110279785A CN 113063984 B CN113063984 B CN 113063984B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/42—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to product of voltage and current
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Abstract
The invention relates to a load identification device, an identification method and a system, wherein a true effective value of a sampling current with a sampling period of 20ms after an electric device is started is obtained, when the difference value between a starting current value and the true effective value of the sampling current when the electric device is not started is larger than a first current threshold value, whether the difference value between the starting current value and a normal current value is larger than a second current threshold value or not is judged, and if yes, the started electric device is an air conditioner; if not, the air conditioner is not in use; and if the power transmission line is the air conditioner, identifying the high-power load outside the air conditioner in the cooling mode by using the active power increased by the power transmission line after the power utilization equipment is started for 10 seconds or identifying the high-power load outside the air conditioner in the heating mode by using the active power increased after 3 minutes, and controlling the power transmission line to be disconnected. The invention can effectively identify the high-power load of the non-air conditioner and control the use of the high-power load of the non-air conditioner, and the high-power load of the non-air conditioner can be set to be as low as 300W of active power, but the active power is more than 3000W, so that the air conditioner can be normally used in a cooling mode or a heating mode.
Description
Technical Field
The invention relates to the field of power electronic technology application, in particular to a load identification device, an identification method and a system.
Background
In the power utilization of apartments and dormitories, inductive, capacitive and resistive loads are generally analyzed from the power factor point of view in order to distinguish power utilization appliances with active power exceeding 300W or more. With the rapid development of economy, cooling and heating air conditioners are installed in student apartments of colleges and universities and large and medium-sized enterprise dormitories, and the active power (cooling power, heating power and auxiliary heating power) of the air conditioners is more than 300W. When a college management party or an enterprise management party agrees to use the air conditioner in an apartment or a dormitory, the power factor reaches over 0.99, even 0.9999 due to the high energy efficiency of the existing air conditioner; particularly, the air conditioner is a pure resistive load when starting auxiliary heating, the pure resistive load is completely consistent with the properties of a heating furnace and an electric furnace, and the discrimination method for analyzing inductive, capacitive and resistive loads from the power factor perspective is ineffective; and the user can also use a special converter to change the power factor of the hot block and the electric stove, so that the load property can not be distinguished at all, and the hot block and the electric stove used in the apartment and dormitory can not be controlled. In addition, in the prior art, the total power can be controlled to control the electric appliances over 300W, and if the limitation is small, the air conditioner cannot be started; if the limitation is large, the electric furnace can be normally used, and serious potential safety hazards exist.
Disclosure of Invention
The invention aims to provide a load identification device, an identification method and a system, which are used for effectively identifying a high-power load of a non-air conditioner and controlling the use of the high-power load of the non-air conditioner.
In order to achieve the purpose, the invention provides the following scheme:
a load identification device, the device comprising: the device comprises a precision current transformer, a metering chip and a single chip microcomputer;
the coil of the precise current transformer is wound on a power transmission line for supplying power to electric equipment by 220V mains supply, and the precise current transformer is used for measuring the current value of the power transmission line;
the control end of the metering chip is connected with the single chip microcomputer, and the input end of the metering chip is connected with the output end of the precision current transformer; the metering chip is used for sampling the current value measured by the precision current transformer according to a sampling period of 20ms under the control of the single chip microcomputer to obtain a sampling current, and calculating the true effective value of the sampling current according to the sampling current;
the single chip microcomputer is connected with the output end of the metering chip and used for receiving the true effective value of the sampling current of the metering chip and judging whether the started electric equipment is an air conditioner or not according to the true effective value of the sampling current.
Optionally, the single chip microcomputer includes:
the sampling current sequence forming module is used for obtaining a true effective value of sampling current with 20ms as a sampling period from the start of the electric equipment to form a sampling current sequence;
the starting current value and normal current value determining module is used for acquiring a true effective value of the sampling current at any sampling moment when the self-powered equipment is started within 100ms in the sampling current sequence, determining the true effective value as a starting current value, acquiring a true effective value of the sampling current at any sampling moment after the self-powered equipment is started for 200ms in the sampling current sequence, and determining the true effective value as a normal current value;
a first judgment result obtaining module, configured to, when a difference between the start current value and a true effective value of the sampling current when the electrical device is not started is greater than a first current threshold, judge whether a difference between the normal current value and the start current value is greater than a second current threshold, and obtain a first judgment result; the first current threshold is less than or equal to twice the second current threshold;
the air conditioner determining module is used for determining that the started electric equipment is an air conditioner if the first judgment result shows that the electric equipment is the air conditioner;
and the non-air-conditioner determining module is used for determining that the started electric equipment is a non-air conditioner if the first judgment result shows that the electric equipment is not air-conditioned.
Optionally, the apparatus further comprises: a voltage reduction resistor and a magnetic latching relay;
the power transmission line is connected with the input end of the metering chip through the voltage reduction resistor, the metering chip is used for sampling the voltage of the power transmission line after voltage reduction according to a sampling period of 20ms under the control of the single chip microcomputer to obtain a sampling voltage, and active power is calculated according to the sampling voltage and the sampling current;
the single chip microcomputer is connected with the control end of the magnetic latching relay and used for obtaining active power of the metering chip, and when the started electric equipment is judged to be an air conditioner according to the true effective value of the sampling current and the increment of the active power is larger than a preset load value, a tripping signal is output to the magnetic latching relay to control the power transmission line to be disconnected.
Optionally, the single chip microcomputer further includes:
the added active power determining module is used for acquiring active power added by the power transmission line after the power consumption equipment is started for 10 seconds or acquiring active power added by the power transmission line after the power consumption equipment is started for 3 minutes when the started power consumption equipment is judged to be an air conditioner according to the true effective value of the sampling current;
and the second judgment result obtaining module is used for outputting a trip signal to the magnetic latching relay to control the power transmission line to be disconnected when the active power increased by the power transmission line after 10 seconds is greater than the sum of the preset refrigerating power of the air conditioner and the preset active power threshold value or when the active power increased by the power transmission line after 3 minutes is greater than the sum of the preset heating power of the air conditioner and the preset active power threshold value.
A load identification method applying the aforementioned load identification apparatus, the method comprising:
obtaining a true effective value of sampling current with 20ms as a sampling period from the start of the electric equipment to form a sampling current sequence;
acquiring a true effective value of the sampling current at any sampling moment within 100ms of the self-powered equipment in the sampling current sequence, determining the true effective value as a starting current value, acquiring a true effective value of the sampling current at any sampling moment after 200ms of the self-powered equipment in the sampling current sequence, and determining the true effective value as a normal current value;
when the difference value between the starting current value and the true effective value of the sampling current when the electric equipment is not started is larger than a first current threshold value, judging whether the difference value between the normal current value and the starting current value is larger than a second current threshold value or not, and obtaining a first judgment result; the first current threshold is less than or equal to twice the second current threshold;
if the first judgment result shows that the first judgment result is yes, the started electric equipment is an air conditioner;
and if the first judgment result shows that the electric equipment is not air-conditioned, starting the electric equipment.
Optionally, if the first determination result indicates yes, the started electrical device load is an air conditioner load, and then the method further includes:
obtaining active power increased by the power transmission line after the self-powered equipment is started for 10 seconds or obtaining active power increased by the power transmission line after the self-powered equipment is started for 3 minutes;
and when the active power added to the power transmission line after 10 seconds is greater than the sum of the preset refrigeration power of the air conditioner and the preset active power threshold value or when the active power added to the power transmission line after 3 minutes is greater than the sum of the preset heating power of the air conditioner and the preset active power threshold value, outputting a trip signal to the magnetic latching relay to control the power transmission line to be disconnected.
A load identification system, the system comprising:
the sampling current sequence module is used for obtaining a true effective value of sampling current with 20ms as a sampling period from the start of the electric equipment to form a sampling current sequence;
the starting current value and normal current value determining module is used for acquiring a true effective value of the sampling current at any sampling moment when the self-powered equipment is started within 100ms in the sampling current sequence, determining the true effective value as a starting current value, acquiring a true effective value of the sampling current at any sampling moment after the self-powered equipment is started for 200ms in the sampling current sequence, and determining the true effective value as a normal current value;
a first judgment result obtaining module, configured to, when a difference between the start current value and a true effective value of the sampling current when the electrical device is not started is greater than a first current threshold, judge whether a difference between the normal current value and the start current value is greater than a second current threshold, and obtain a first judgment result; the first current threshold is less than or equal to twice the second current threshold;
the air conditioner determining module is used for determining that the started electric equipment is an air conditioner if the first judgment result shows that the electric equipment is the air conditioner;
and the non-air-conditioner determining module is used for determining that the started electric equipment is a non-air conditioner if the first judgment result shows that the electric equipment is not air-conditioned.
Optionally, the system further includes:
the added active power determining module is used for obtaining active power added by the power transmission line after the power utilization equipment is started for 10 seconds or obtaining active power added by the power transmission line after the power utilization equipment is started for 3 minutes;
and the second judgment result obtaining module is used for outputting a trip signal to the magnetic latching relay to control the power transmission line to be disconnected when the active power increased by the power transmission line after 10 seconds is greater than the sum of the preset refrigerating power of the air conditioner and the preset active power threshold value or when the active power increased by the power transmission line after 3 minutes is greater than the sum of the preset heating power of the air conditioner and the preset active power threshold value.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention aims to provide a load identification device, an identification method and a system, wherein a true effective value of a sampling current with 20ms as a sampling period after an electric device is started is obtained, the true effective value of the sampling current at any sampling moment within 100ms after the electric device is started is determined as a starting current value, the true effective value of the sampling current at any sampling moment after the electric device is started for 200ms is determined as a normal current value, when the difference value between the starting current value and the true effective value of the sampling current when the electric device is not started is greater than a first current threshold value, whether the difference value between the starting current value and the normal current value is greater than a second current threshold value or not is judged, and if yes, the started electric device is an air conditioner; if not, the started electric equipment is a non-air conditioner; and then, the high-power load except the air conditioner is identified through the active power added by the power transmission line after the self-powered equipment is started for 10 seconds or 3 minutes, the power transmission line is controlled to be disconnected, the high-power load of the non-air conditioner is effectively identified, and the use of the high-power load of the non-air conditioner is controlled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a block diagram of a load recognition apparatus according to the present invention;
FIG. 2 is a schematic diagram of a load recognition apparatus according to the present invention;
FIG. 3 is a flow chart of a method of load identification provided by the present invention;
FIG. 4 is a diagram illustrating the setting of air conditioning parameters according to the present invention;
description of the symbols:
the device comprises a precision current transformer 1, a voltage reduction resistor 2, a metering chip 3, a singlechip 4 and a magnetic latching relay 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a load identification device, an identification method and a system, which are used for effectively identifying a high-power load of a non-air conditioner and controlling the use of the high-power load of the non-air conditioner.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
A load identifying device, as shown in fig. 1-2, the device comprising: the device comprises a precision current transformer 1, a metering chip 3, a singlechip 4 and a magnetic latching relay 5;
a coil of the precise current transformer 1 is wound on a power transmission line for supplying power to electric equipment by 220V mains supply, and the precise current transformer 1 is used for measuring the current value of the power transmission line; the precision current transformer 1 is a 100A/50mA precision current transformer.
The control end of the metering chip 3 is connected with the single chip microcomputer 4, and the input end of the metering chip 3 is connected with the output end of the precision current transformer 1; the metering chip 3 is used for sampling the current value measured by the precision current transformer 1 according to a sampling period of 20ms under the control of the singlechip 4 to obtain a sampling current, and calculating the true effective value of the sampling current according to the sampling current; the metering chip 3 is a special metering chip capable of measuring 20ms period true effective value alternating current.
The relay used by the invention is an energy-saving magnetic latching relay, so that the use of electric energy is reduced.
Wherein, singlechip 4 includes:
the sampling current sequence forming module is used for obtaining a true effective value of sampling current with 20ms as a sampling period from the start of the electric equipment to form a sampling current sequence;
the starting current value and normal current value determining module is used for acquiring a true effective value of the sampling current at any sampling moment when the self-powered equipment is started within 100ms in the sampling current sequence, determining the true effective value as a starting current value, acquiring a true effective value of the sampling current at any sampling moment after the self-powered equipment is started for 200ms in the sampling current sequence, and determining the true effective value as a normal current value;
the first judgment result obtaining module is used for judging whether the difference value between the normal current value and the starting current value is greater than a second current threshold value or not when the difference value between the starting current value and the true effective value of the sampling current when the electric equipment is not started is greater than a first current threshold value, and obtaining a first judgment result; the first current threshold is less than or equal to twice the second current threshold;
the air conditioner determining module is used for starting the electric equipment as an air conditioner if the first judgment result shows that the electric equipment is the air conditioner;
and the non-air-conditioning determining module is used for determining that the started electric equipment is a non-air conditioner if the first judgment result shows that the electric equipment is not air-conditioned.
The load recognition device further includes: a voltage reduction resistor 2 and a magnetic latching relay 5;
the power transmission line is connected with the input end of a metering chip 3 through a voltage reduction resistor 2, the metering chip 3 is used for sampling the voltage of the power transmission line after voltage reduction according to a sampling period of 20ms under the control of a single chip microcomputer 4 to obtain sampling voltage, and active power is calculated according to the sampling voltage and the sampling current;
the single chip microcomputer 4 is connected with a control end of the magnetic latching relay 5, the single chip microcomputer 4 is used for obtaining active power of the metering chip 3, when the started electric equipment is judged to be an air conditioner according to the true effective value of the sampling current, and when the increment of the active power is larger than a load preset value, a tripping signal is output to the magnetic latching relay 5, and the power transmission line is controlled to be disconnected.
Wherein, singlechip 4 still includes:
the added active power determining module is used for acquiring active power added by the power transmission line after the power consumption equipment is started for 10 seconds or acquiring active power added by the power transmission line after the power consumption equipment is started for 3 minutes when the started power consumption equipment is judged to be an air conditioner according to the true effective value of the sampling current;
and the second judgment result obtaining module is used for outputting a trip signal to the magnetic latching relay 5 to control the power transmission line to be disconnected when the active power increased by the power transmission line after 10 seconds is greater than the sum of the preset refrigerating power of the air conditioner and the preset active power threshold value or when the active power increased by the power transmission line after 3 minutes is greater than the sum of the preset heating power of the air conditioner and the preset active power threshold value.
The background software automatically modifies the delay time according to the season, i.e. 10 seconds or 3 minutes. In the season that the air conditioner needs to be refrigerated, the background software sets the delay time to be 10 seconds, and the air conditioner is in a refrigeration mode after being started; in the season that the air conditioner needs to heat, the background software sets the delay time to be 3 minutes (180 seconds), and the air conditioner is in a heating mode after being started.
Since the use of electric consumers having an active power exceeding 300W or more is prohibited in the apartment and dormitory electric use, the preset active power threshold is 300W or more. In fig. 4, the preset cooling power of the air conditioner is 1004W, the preset heating power of the air conditioner is 1120W, and the auxiliary heating power is 1000W.
The invention also provides a load identification method, which applies the load identification device, and as shown in fig. 3, the method comprises the following steps:
s101, acquiring a true effective value of sampling current with 20ms as a sampling period after the electric equipment is started to form a sampling current sequence;
s102, acquiring a true effective value of the sampling current at any sampling moment within 100ms of the self-powered equipment in the sampling current sequence, determining the true effective value as a starting current value, acquiring a true effective value of the sampling current at any sampling moment after 200ms of the self-powered equipment in the sampling current sequence, and determining the true effective value as a normal current value;
s103, when the difference value between the starting current value and the true effective value of the sampling current when the electric equipment is not started is larger than a first current threshold value, judging whether the difference value between the normal current value and the starting current value is larger than a second current threshold value or not, and obtaining a first judgment result; the first current threshold is less than or equal to twice the second current threshold; preferably, the first current threshold is 8A and the second current threshold is 4A;
s104, if the first judgment result shows that the equipment is the air conditioner, the started electric equipment is the air conditioner;
and S105, if the first judgment result shows that the electric equipment is not air-conditioned, starting the electric equipment.
After step S104, the trend of the active power is analyzed to control the on/off of the power transmission line, which specifically includes:
obtaining active power increased by the power transmission line after the self-powered equipment is started for 10 seconds or obtaining active power increased by the power transmission line after the self-powered equipment is started for 3 minutes;
and when the active power added to the power transmission line after 10 seconds is greater than the sum of the preset refrigeration power of the air conditioner and the preset active power threshold value or when the active power added to the power transmission line after 3 minutes is greater than the sum of the preset heating power of the air conditioner and the preset active power threshold value, outputting a tripping signal to the magnetic latching relay to control the power transmission line to be disconnected.
The calculation period of the active power change value is 5 s. I.e. the active power of a single electric appliance, is obtained by analyzing the change value of the active power for 5 seconds. The maximum period is 3 minutes when the air conditioner start-up characteristic is detected.
When the air conditioner is allowed to be used, the condition cannot be distinguished simply through the power factor, and for the air conditioner, even if the active power reaches 3000W, the trip is not judged, and for the non-air conditioner, no matter how many power factors exist, the trip is judged when a single electric appliance is larger than a preset active power threshold value.
When the air conditioner is started, the starting current of 100ms is provided, then the normal current is recovered, the starting current of 100ms is more than 3 times of the normal current, if the weather is too cold, the auxiliary heater can be started within 3 minutes.
No matter whether the electric equipment is connected with a special converter or not, the invention can accurately distinguish the characteristics of the air conditioner according to the special starting current characteristics of the air conditioner, thereby effectively distinguishing and controlling.
The invention also provides a system for load identification, which comprises:
the sampling current sequence module is used for obtaining a true effective value of sampling current with 20ms as a sampling period from the start of the electric equipment to form a sampling current sequence;
the starting current value and normal current value determining module is used for acquiring a true effective value of the sampling current at any sampling moment when the self-powered equipment is started within 100ms in the sampling current sequence, determining the true effective value as a starting current value, acquiring a true effective value of the sampling current at any sampling moment after the self-powered equipment is started for 200ms in the sampling current sequence, and determining the true effective value as a normal current value;
the first judgment result obtaining module is used for judging whether the difference value between the normal current value and the starting current value is greater than a second current threshold value or not when the difference value between the starting current value and the true effective value of the sampling current when the electric equipment is not started is greater than a first current threshold value, and obtaining a first judgment result; the first current threshold is less than or equal to twice the second current threshold;
the air conditioner determining module is used for starting the electric equipment as an air conditioner if the first judgment result shows that the electric equipment is the air conditioner;
and the non-air-conditioning determining module is used for determining that the started electric equipment is a non-air conditioner if the first judgment result shows that the electric equipment is not air-conditioned.
The system further comprises:
the added active power determining module is used for obtaining active power added by the power transmission line after the power utilization equipment is started for 10 seconds or obtaining active power added by the power transmission line after the power utilization equipment is started for 3 minutes;
and the second judgment result obtaining module is used for outputting a trip signal to the magnetic latching relay to control the power transmission line to be disconnected when the active power increased by the power transmission line after 10 seconds is greater than the sum of the preset refrigerating power of the air conditioner and the preset active power threshold value or when the active power increased by the power transmission line after 3 minutes is greater than the sum of the preset heating power of the air conditioner and the preset active power threshold value.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. A load identification device, the device comprising: the device comprises a precision current transformer, a metering chip and a single chip microcomputer;
the coil of the precise current transformer is wound on a power transmission line for supplying power to electric equipment by 220V mains supply, and the precise current transformer is used for measuring the current value of the power transmission line;
the control end of the metering chip is connected with the single chip microcomputer, and the input end of the metering chip is connected with the output end of the precision current transformer; the metering chip is used for sampling the current value measured by the precision current transformer according to a sampling period of 20ms under the control of the single chip microcomputer to obtain a sampling current, and calculating the true effective value of the sampling current according to the sampling current;
the single chip microcomputer is connected with the output end of the metering chip and used for receiving the true effective value of the sampling current of the metering chip and judging whether the started electric equipment is an air conditioner or not according to the true effective value of the sampling current;
the singlechip includes:
the sampling current sequence forming module is used for obtaining a true effective value of sampling current with 20ms as a sampling period from the start of the electric equipment to form a sampling current sequence;
the starting current value and normal current value determining module is used for acquiring a true effective value of the sampling current at any sampling moment when the self-powered equipment is started within 100ms in the sampling current sequence, determining the true effective value as a starting current value, acquiring a true effective value of the sampling current at any sampling moment after the self-powered equipment is started for 200ms in the sampling current sequence, and determining the true effective value as a normal current value;
a first judgment result obtaining module, configured to, when a difference between the start current value and a true effective value of the sampling current when the electrical device is not started is greater than a first current threshold, judge whether a difference between the normal current value and the start current value is greater than a second current threshold, and obtain a first judgment result; the first current threshold is less than or equal to twice the second current threshold;
the air conditioner determining module is used for determining that the started electric equipment is an air conditioner if the first judgment result shows that the electric equipment is the air conditioner;
and the non-air-conditioner determining module is used for determining that the started electric equipment is a non-air conditioner if the first judgment result shows that the electric equipment is not air-conditioned.
2. The load identification device of claim 1, wherein the device further comprises: a voltage reduction resistor and a magnetic latching relay;
the power transmission line is connected with the input end of the metering chip through the voltage reduction resistor, the metering chip is used for sampling the voltage of the power transmission line after voltage reduction according to a sampling period of 20ms under the control of the single chip microcomputer to obtain a sampling voltage, and active power is calculated according to the sampling voltage and the sampling current;
the single chip microcomputer is connected with the control end of the magnetic latching relay and used for obtaining active power of the metering chip, and when the started electric equipment is judged to be an air conditioner according to the true effective value of the sampling current and the increment of the active power is larger than a preset load value, a tripping signal is output to the magnetic latching relay to control the power transmission line to be disconnected.
3. The load recognition device of claim 2, wherein the single-chip microcomputer further comprises:
the added active power determining module is used for acquiring active power added by the power transmission line after the power consumption equipment is started for 10 seconds or acquiring active power added by the power transmission line after the power consumption equipment is started for 3 minutes when the started power consumption equipment is judged to be an air conditioner according to the true effective value of the sampling current;
and the second judgment result obtaining module is used for outputting a trip signal to the magnetic latching relay to control the power transmission line to be disconnected when the active power increased by the power transmission line after 10 seconds is greater than the sum of the preset refrigerating power of the air conditioner and the preset active power threshold value or when the active power increased by the power transmission line after 3 minutes is greater than the sum of the preset heating power of the air conditioner and the preset active power threshold value.
4. A load recognition method, wherein the load recognition apparatus according to any one of claims 1 to 3 is applied, the method comprising:
obtaining a true effective value of sampling current with 20ms as a sampling period from the start of the electric equipment to form a sampling current sequence;
acquiring a true effective value of the sampling current at any sampling moment within 100ms of the self-powered equipment in the sampling current sequence, determining the true effective value as a starting current value, acquiring a true effective value of the sampling current at any sampling moment after 200ms of the self-powered equipment in the sampling current sequence, and determining the true effective value as a normal current value;
when the difference value between the starting current value and the true effective value of the sampling current when the electric equipment is not started is larger than a first current threshold value, judging whether the difference value between the normal current value and the starting current value is larger than a second current threshold value or not, and obtaining a first judgment result; the first current threshold is less than or equal to twice the second current threshold;
if the first judgment result shows that the first judgment result is yes, the started electric equipment is an air conditioner;
and if the first judgment result shows that the electric equipment is not air-conditioned, starting the electric equipment.
5. The load identification method according to claim 4, wherein if the first determination result indicates yes, the started electrical equipment load is an air conditioner load, and then the method further comprises:
obtaining active power increased by the power transmission line after the self-powered equipment is started for 10 seconds or obtaining active power increased by the power transmission line after the self-powered equipment is started for 3 minutes;
and when the active power added to the power transmission line after 10 seconds is greater than the sum of the preset refrigeration power of the air conditioner and the preset active power threshold value or when the active power added to the power transmission line after 3 minutes is greater than the sum of the preset heating power of the air conditioner and the preset active power threshold value, outputting a tripping signal to the magnetic latching relay to control the power transmission line to be disconnected.
6. A load identification system, the system comprising:
the sampling current sequence module is used for obtaining a true effective value of sampling current with 20ms as a sampling period from the start of the electric equipment to form a sampling current sequence;
the starting current value and normal current value determining module is used for acquiring a true effective value of the sampling current at any sampling moment when the self-powered equipment is started within 100ms in the sampling current sequence, determining the true effective value as a starting current value, acquiring a true effective value of the sampling current at any sampling moment after the self-powered equipment is started for 200ms in the sampling current sequence, and determining the true effective value as a normal current value;
a first judgment result obtaining module, configured to, when a difference between the start current value and a true effective value of the sampling current when the electrical device is not started is greater than a first current threshold, judge whether a difference between the normal current value and the start current value is greater than a second current threshold, and obtain a first judgment result; the first current threshold is less than or equal to twice the second current threshold;
the air conditioner determining module is used for determining that the started electric equipment is an air conditioner if the first judgment result shows that the electric equipment is the air conditioner;
and the non-air-conditioner determining module is used for determining that the started electric equipment is a non-air conditioner if the first judgment result shows that the electric equipment is not air-conditioned.
7. The load identification system of claim 6, further comprising:
the added active power determining module is used for obtaining active power added by the power transmission line after the power utilization equipment is started for 10 seconds or obtaining active power added by the power transmission line after the power utilization equipment is started for 3 minutes;
and the second judgment result obtaining module is used for outputting a trip signal to the magnetic latching relay to control the power transmission line to be disconnected when the active power increased by the power transmission line after 10 seconds is greater than the sum of the preset refrigerating power of the air conditioner and the preset active power threshold value or when the active power increased by the power transmission line after 3 minutes is greater than the sum of the preset heating power of the air conditioner and the preset active power threshold value.
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| CN103424642B (en) * | 2012-05-16 | 2016-12-14 | 杭州佳和电气股份有限公司 | Possess the dynamic and intelligent identification of many equipment and the multifunctional electric meter of energy consumption fractionation function |
| TWI491136B (en) * | 2012-06-27 | 2015-07-01 | Ind Tech Res Inst | Method and system for monitoring load of electric device |
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| EP3696927A1 (en) * | 2019-02-15 | 2020-08-19 | Siemens Aktiengesellschaft | Device and method for monitoring a plurality of feeders in a power grid |
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