CN114740296B - Working condition monitoring method of power factor compensation equipment - Google Patents
Working condition monitoring method of power factor compensation equipment Download PDFInfo
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- CN114740296B CN114740296B CN202210370370.9A CN202210370370A CN114740296B CN 114740296 B CN114740296 B CN 114740296B CN 202210370370 A CN202210370370 A CN 202210370370A CN 114740296 B CN114740296 B CN 114740296B
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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
- G01R19/06—Measuring real component; Measuring reactive component
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/002—Measuring real component
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/003—Measuring reactive component
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The invention relates to a method for monitoring the working condition of power factor compensation equipment, which comprises a monitoring system and a detection step for detecting the working condition of the power factor compensation equipment by using the monitoring system, wherein the monitoring system comprises a reactive compensation sampling module; an electrical load sampling module; the metering module and the wireless communication module; a server; the metering module sends data to the server through the wireless communication module; the detection step comprises the following steps: step S1, step S2, step S3 and step S4, the invention combines the data collected by the reactive power compensation sampling module and the electricity load sampling module to detect and evaluate, and find the working condition of the reactive power compensation equipment in time, and can provide the accuracy of evaluation.
Description
[ Field of technology ]
The invention relates to the field of power factor compensation equipment working condition monitoring, in particular to a power factor compensation equipment working condition monitoring method.
[ Background Art ]
The existing power factor compensation device has 2 modes for detecting the working condition.
First, the power factor indicating value and reactive compensation current indicating value of the power factor compensation controller are observed on site, and the method has the defects that the method cannot be remotely detected, the reactive load power, the electric quantity and the property cannot be judged, and the reactive compensation cannot be judged to be under compensation or over compensation.
Secondly, an ammeter is installed on the low-voltage side or the high-voltage side of the transformer, active power and electric quantity of the load side and reactive power and electric quantity data are sent to a remote server through wireless communication, and accordingly power factors are calculated to indirectly judge the working condition of the reactive compensation device. The method has the defects that the accuracy of judging the working condition of the reactive compensation device is poor due to the lack of reactive compensation power and electric quantity data, and whether the configuration of the reactive compensation device is reasonable cannot be judged.
The prior art therefore does not meet our needs.
[ Invention ]
In order to solve the problems, the invention provides a power factor compensation equipment working condition monitoring method with good monitoring effect.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a power factor compensation device operating condition monitoring method comprising a monitoring system and a detecting step of detecting an operating condition of a power factor compensation device using the monitoring system, the monitoring system comprising:
The reactive compensation sampling module is used for collecting reactive compensation current and reactive compensation voltage of reactive compensation equipment;
the electricity load sampling module is used for collecting load current and load voltage of an electricity side;
the metering module is connected with the reactive compensation sampling module and the electricity load sampling module,
The wireless communication module is connected with the metering module and used for sending the data received by the metering module and the calculated data outwards;
The server establishes wireless communication connection with the wireless communication module to receive data sent by the wireless communication module and realize remote data transmission;
the metering module sends data to the server through the wireless communication module;
The detection step comprises the following steps:
Step S1, collecting reactive compensation current I Tonifying device and reactive compensation voltage U Tonifying device of reactive compensation equipment through the reactive compensation sampling module;
s2, collecting a load current I and a load voltage U at the electricity side through the electricity load sampling module;
Step S3, calculating reactive compensation power Q Tonifying device , reactive compensation electric quantity delta Q Tonifying device , power consumption load active power P, power consumption load active electric quantity delta P, power consumption load reactive power Q and power consumption load reactive electric quantity delta Q through the metering module;
and S4, transmitting the data calculated by the metering module in the step S3 to a server through a wireless communication module, and analyzing the data by the server to further judge the working condition of the power factor compensation equipment.
As a preferred embodiment, further defined as: the calculation formula of the metering module in the step S3 includes:
Q Tonifying device ＝I Tonifying device *U Tonifying device *sinΦ,ΔQ Tonifying device ＝I Tonifying device *U Tonifying device *sinΦ*ΔT；
P＝I*U*cosФ，△P＝I*U*cosФ*△T；
Q＝I*U*sinФ，△Q＝I*U*sinФ*△T。
As a preferred embodiment, further defined as: the server analyzing the data comprises the following analysis steps:
step S41, presetting a power factor reference value;
step S42, calculating the average power factor of the electricity side
Step S43, calculating the power Q Can be supplemented which the power factor compensation device can compensate,
Step S44, comparing the average power factor delta cos phi of the electricity consumption side with a power factor reference value (namely 0.95); and when the delta cos phi is lower than 0.95, judging the working condition of the power factor compensation equipment according to the reactive power compensation electric quantity delta Q Tonifying device , the electric load active electric quantity delta P and the electric load reactive power electric quantity delta Q.
As a preferred embodiment, further defined as: the actual reactive power Q Actual practice is that of at the power consumer side when the reactive compensation power Q Tonifying device is not being delivered to it by the reactive compensation device is equal to the sum of the load reactive power Q and the reactive compensation power Q Tonifying device .
As a preferred embodiment, further defined as: the working conditions comprise insufficient compensation capacity of the reactive compensation equipment, failure of a compensation unit of the reactive compensation equipment, overcompensation of the compensation unit of the reactive compensation equipment and failure of the reactive compensation equipment.
As a preferred embodiment, further defined as: when Q Actual practice is that of is larger than Q Tonifying device , if Q Can be supplemented is smaller than Q Actual practice is that of , the working condition is that the compensation capacity of the reactive compensation equipment is insufficient; if Q Can be supplemented is larger than Q Actual practice is that of , the working condition is that the compensation unit of the reactive compensation equipment fails;
When Q Actual practice is that of is smaller than Q Tonifying device and Q Can be supplemented is larger than Q Actual practice is that of , then the working condition is that the compensation unit of the reactive compensation device is overcompensated or the reactive compensation device fails.
As a preferred embodiment, further defined as: the power factor includes an average power factor or an instantaneous power factor of the power-using side.
As a preferred embodiment, further defined as: the electricity utilization side is provided with an electricity utilization load adoption point;
the output end of the reactive compensation equipment connected with the electricity utilization side is provided with a reactive compensation sampling point;
The electricity load sampling module is arranged at an electricity load adoption point;
And the reactive compensation sampling module is arranged at a reactive compensation sampling point.
As a preferred embodiment, further defined as: the monitoring system is provided with at least one.
As a preferred embodiment, further defined as: the A-phase current of one monitoring system is connected in series to the A-phase of a current loop of the power supply, and the A-phase voltage of one monitoring system is connected to the A-phase of a sampling current in-phase voltage of the power supply; the B-phase current of the other monitoring system is connected in series to an A-phase indicator meter sampling current loop of the reactive compensation equipment, and the B-phase voltage of the monitoring system is connected to the A-phase voltage of one of the monitoring systems.
The beneficial effects of the invention are as follows: the invention combines the data collected by the reactive power compensation sampling module and the electricity load sampling module to detect and evaluate, and discovers the working condition of the reactive power compensation equipment in time, and can provide the accuracy of evaluation.
[ Description of the drawings ]
FIG. 1 is a schematic diagram of the structure of the present monitoring system;
FIG. 2 is a schematic diagram of the connection of the power side to the reactive compensation device of the present invention;
FIG. 3 is a transverse cross-sectional view of the present invention in a clamped state;
Fig. 4 is a schematic diagram of the present invention for collecting data.
[ Detailed description ] of the invention
The invention is described in further detail below with reference to the attached drawings and detailed description:
as shown in fig. 1 to 4, a power factor compensation device operation condition monitoring method includes a monitoring system 100 and a detection step of detecting an operation condition of a power factor compensation device using the monitoring system 100, the monitoring system 100 includes:
The reactive compensation sampling module 10 is used for collecting reactive compensation current and reactive compensation voltage of reactive compensation equipment;
the electricity load sampling module 20 is used for collecting load current and load voltage of an electricity side;
the metering module 30 is connected with the reactive compensation sampling module 10 and the electricity load sampling module 20,
The wireless communication module 40 is connected with the metering module 30 and is used for sending the data received by the metering module and the calculated data outwards;
the server 50 establishes wireless communication connection with the wireless communication module 40 to receive data sent by the wireless communication module 40 and realize remote data transmission;
the metering module 30 sends data to the server 50 via the wireless communication module 40;
The detection step comprises the following steps:
Step S1, collecting reactive compensation current I Tonifying device and reactive compensation voltage U Tonifying device of reactive compensation equipment through the reactive compensation sampling module 10;
step S2, collecting a load current I and a load voltage U at the electricity side through the electricity load sampling module 20;
step S3, calculating reactive compensation power Q Tonifying device , reactive compensation power Δq Tonifying device , active power P of the electric load, active power Δp of the electric load, reactive power Q of the electric load, and reactive power Δq of the electric load by using the metering module 30;
In step S4, the data calculated by the metering module 30 in step S3 is sent to a server through the wireless communication module 40, and the server 50 analyzes the data, so as to determine the working condition of the power factor compensation device.
The invention judges the working condition of the reactive compensation device according to the active load power and the electric quantity, the reactive load power and the electric quantity, and the reactive compensation power and the electric quantity, and can efficiently and accurately judge whether the reactive compensation equipment fails or not and accurately judge whether the configuration of the reactive compensation equipment is reasonable or not.
In this embodiment, the calculation formula of the metering module in step S3 includes:
Q Tonifying device ＝I Tonifying device *U Tonifying device *sinΦ,ΔQ Tonifying device ＝I Tonifying device *U Tonifying device *sinΦ*ΔT；
P＝I*U*cosФ，△P＝I*U*cosФ*△T；
Q＝I*U*sinФ，△Q＝I*U*sinФ*△T。
In this embodiment, the server 50 analyzes the data including the following analysis steps:
step S41, presetting a power factor reference value;
step S42, calculating the average power factor of the electricity side
Step S43, calculating the power Q Can be supplemented which the power factor compensation device can compensate,
Step S44, comparing the average power factor delta cos phi of the electricity consumption side with a power factor reference value, namely 0.95; and when the delta cos phi is lower than 0.95, judging the working condition of the power factor compensation equipment according to the reactive power compensation electric quantity delta Q Tonifying device , the electric load active electric quantity delta P and the electric load reactive power electric quantity delta Q.
In this embodiment, the actual reactive power Q Actual practice is that of at the power consumer side when not being given the reactive compensation power Q Tonifying device by the reactive compensation device is equal to the sum of the load reactive power Q and the reactive compensation power Q Tonifying device .
In this embodiment, the working conditions include insufficient compensation capacity of the reactive compensation device, failure of the compensation unit of the reactive compensation device, overcompensation of the compensation unit of the reactive compensation device, and failure of the reactive compensation device.
In this embodiment, when Q Actual practice is that of is greater than Q Tonifying device and if Q Can be supplemented is less than Q Actual practice is that of , the working condition is that the compensation capacity of the reactive compensation device is insufficient; if Q Can be supplemented is larger than Q Actual practice is that of , the working condition is that the compensation unit of the reactive compensation equipment fails;
When Q Actual practice is that of is smaller than Q Tonifying device and Q Can be supplemented is larger than Q Actual practice is that of , then the working condition is that the compensation unit of the reactive compensation device is overcompensated or the reactive compensation device fails.
In this embodiment, the power factor includes an average power factor or an instantaneous power factor of the power consumption side.
In this embodiment, the electricity-using side is provided with an electricity-using load-using point 60;
The output end of the reactive compensation equipment connected with the electricity utilization side is provided with a reactive compensation sampling point 70;
The electricity load sampling module 20 is arranged at an electricity load adopting point 60;
The reactive compensation sampling module 10 is arranged at a reactive compensation sampling point 70.
In this embodiment, the monitoring system 100 is provided with at least one.
In this embodiment, an a-phase current of the monitoring system 100 is connected in series to an a-phase of a current loop of the power supply, and an a-phase voltage of the monitoring system 100 is connected to an a-phase of a sampling current in-phase voltage of the power supply; the B-phase current of the other monitoring system 100 is connected in series to the a-phase indicator sampling current loop of the reactive compensation device, and the B-phase voltage of the monitoring system 100 is connected to the a-phase voltage of one of the monitoring systems 100.
The specific operation of the present embodiment is illustrated below when the preset power factor reference value is set to 0.95. For example, one:
The reactive compensation equipment is composed of 6 groups of compensation units with equal compensation capacity, each group of compensation units is configured with 30 kilovar compensation capacity, and the highest compensation capacity of 6 groups of compensation units can be 180 kilovar when the reactive compensation equipment works simultaneously. At the positive 11 am of 7 months 1 of 2021, the active power P=600 kilowatts of the electric load, the reactive power Q=inductive 360 kilovar (namely positive 360 kilovar) of the electric load and the reactive power Q Tonifying device =180 kilovar are obtained through the working condition monitoring system of the power factor compensation equipment;
and carrying out data analysis by taking the instantaneous power factor of the electricity side as an analysis basis:
Since the reactive power Q of the consumer is the data after the consumer side has accepted the reactive compensation power Q Tonifying device to which the reactive compensation device is applying, the actual reactive power Q Actual practice is that of of the consumer side when not receiving the reactive compensation power Q Tonifying device to which the reactive compensation device is applying should be equal to the sum of the reactive power Q of the consumer and the reactive compensation power Q Tonifying device , i.e. Q Actual practice is that of ＝Q+Q Tonifying device =360+180=540 kilovar. The reactive compensation device can only compensate 180 kilovar at maximum, which is far smaller than the actual reactive power Q Actual practice is that of (i.e. 540 kilovar) that should be compensated. The working condition is that the compensation capacity of the reactive compensation equipment is insufficient, and the compensation capacity of the reactive compensation equipment can be increased by the treatment measure at the moment, for example, the reactive compensation equipment can be increased to 18 groups from 6 groups of original compensation units.
For example two:
The reactive compensation equipment is composed of 18 groups of compensation units with equal compensation capacity, each group of compensation units is provided with 30 kilovar compensation capacity, and the highest compensation is 540 kilovar when the 18 groups work simultaneously. At the positive 11 am of 7 months 1 of 2021, the active power P=600 kilowatts of the electric load, the reactive power Q=inductive 360 kilovar (namely positive 360 kilovar) of the electric load and the reactive power Q Tonifying device =180 kilovar are obtained through the working condition monitoring system of the power factor compensation equipment;
and carrying out data analysis by taking the instantaneous power factor of the electricity side as an analysis basis:
Since the reactive power Q of the consumer is the data after the consumer side has accepted the reactive compensation power Q Tonifying device to which the reactive compensation device is applying, the actual reactive power Q Actual practice is that of of the consumer side when not receiving the reactive compensation power Q Tonifying device to which the reactive compensation device is applying should be equal to the sum of the reactive power Q of the consumer and the reactive compensation power Q Tonifying device , i.e. Q Actual practice is that of ＝Q+Q Tonifying device =360+180=540 kilovar. The reactive compensation device can only compensate 180 kilovar at maximum, which is far smaller than the actual reactive power Q Actual practice is that of (i.e. 540 kilovar) that should be compensated.
Indicating a failure of the reactive compensation equipment, possibly a failure of 12 groups of compensation units therein.
And (3) processing measures, wherein the reactive compensation equipment is required to be maintained.
For example three:
The reactive compensation equipment is composed of 6 groups of compensation units with equal compensation capacity, each group of compensation units is configured with 30 kilovar compensation capacity, and the highest compensation capacity of 6 groups of compensation units can be 180 kilovar when the reactive compensation equipment works simultaneously. At the positive 11 am of 7 months 1 of 2021, the active power P=20 kilowatts of the electric load, the reactive power Q=15 kilovar of the capacitive load (namely negative 15 kilovar) and the reactive power Q Tonifying device =30 kilovar of the electric load are obtained through the working condition monitoring system of the power factor compensation equipment;
and carrying out data analysis by taking the instantaneous power factor of the electricity side as an analysis basis:
Since the reactive power Q of the consumer is the data after the consumer has accepted the reactive compensation power Q Tonifying device to which the reactive compensation device is applying, the actual reactive power Q Actual practice is that of of the consumer when it is not receiving the reactive compensation power Q Tonifying device to which the reactive compensation device is applying should be equal to the sum of the reactive power Q of the consumer and the reactive compensation power Q Tonifying device , i.e. Q Actual practice is that of ＝Q+Q Tonifying device = (-15) +30=15 kilovar. That is, only 15 kilovar need be actually supplied to the electricity side, but the capacity of a single compensation unit is already 30 kilovar, even if only one group of compensation units is put into use, resulting in overcompensation.
Processing measures configure the capacity of a single compensation unit to 15 kilovar.
For example four:
the reactive compensation equipment is composed of 6 groups of compensation units with equal compensation capacity, each group of compensation units is configured with 30 kilovar compensation capacity, and the highest compensation capacity of 6 groups of compensation units can be 180 kilovar when the reactive compensation equipment works simultaneously. At the positive 11 am of 7 months 1 of 2021, the active power P=0 kilowatts of the electric load, the reactive power Q=180 kilovar of the capacitive load (namely negative 180 kilovar) and the reactive power Q Tonifying device =180 kilovar of the electric load are obtained through the working condition monitoring system of the power factor compensation equipment;
and carrying out data analysis by taking the instantaneous power factor of the electricity side as an analysis basis:
since the utility side is operating without load, the utility side actual reactive power Q Actual practice is that of should be equal to zero. No reactive power compensation is required at this point. But the reactive compensation device performs reactive compensation due to the failure of the reactive compensation device.
And (3) processing measures, wherein the reactive compensation equipment is required to be maintained.
For example five:
The reactive compensation equipment is composed of 6 groups of compensation units with equal compensation capacity, each group of compensation units is configured with 30 kilovar compensation capacity, and the highest compensation capacity of 6 groups of compensation units can be 180 kilovar when the reactive compensation equipment works simultaneously. In the beginning of 11 am of 7 months 1 of 2021, the working condition monitoring system of the power factor compensation equipment obtains the active electric quantity DeltaP=600 kilowatt hours of the electric load, the reactive electric quantity DeltaQ=360 kilohours of the electric load and the reactive compensation electric quantity DeltaQ Tonifying device =180 kilohours;
and carrying out data analysis by taking the average power factor of the electricity side as an analysis basis:
Since the reactive power Δq of the power consumer is the data after the power consumer has received the reactive compensation power Δq Tonifying device given to it by the reactive compensation device, the actual reactive power Δq Actual practice is that of of the power consumer when not receiving the reactive compensation power Δq Tonifying device given to it by the reactive compensation device should be equal to the sum of the reactive power Δq of the power consumer and the reactive compensation power Δq Tonifying device , i.e. Δq Actual practice is that of ＝△Q+△Q Tonifying device =360+180=540 kilo. However, the reactive compensation device can only compensate 180 kilohours at maximum, which is far smaller than the actual reactive power Δq Actual practice is that of (i.e. 540 kilohours) to be compensated. The measure handled at this time may increase the compensation capacity of the reactive compensation device, for example by increasing the reactive compensation device from the original 6 groups of compensation units to 18 groups.
Claims (6)
1. A power factor compensation equipment working condition monitoring method is characterized in that: comprising a monitoring system (100) and a detection step of detecting an operating condition of the power factor compensation device using the monitoring system (100), the monitoring system (100) comprising:
The reactive compensation sampling module (10) is used for collecting reactive compensation current and reactive compensation voltage of reactive compensation equipment;
the electricity load sampling module (20) is used for collecting load current and load voltage of an electricity side;
the metering module (30) is connected with the reactive compensation sampling module (10) and the electricity load sampling module (20),
The wireless communication module (40) is connected with the metering module (30) and is used for sending the data received by the metering module and the calculated data outwards;
The server (50) establishes wireless communication connection with the wireless communication module (40) so as to receive data sent by the wireless communication module (40) and realize remote data transmission;
The metering module (30) sends data to the server (50) through the wireless communication module (40);
The detection step comprises the following steps:
Step S1, collecting reactive compensation current I Tonifying device and reactive compensation voltage U Tonifying device of reactive compensation equipment through the reactive compensation sampling module (10);
s2, collecting a load current I and a load voltage U at the electricity consumption side through the electricity consumption load sampling module (20);
Step S3, calculating reactive compensation power Q Tonifying device , reactive compensation electric quantity delta Q Tonifying device , power consumption load active power P, power consumption load active electric quantity delta P, power consumption load reactive power Q and power consumption load reactive electric quantity delta Q through the metering module (30);
Step S4, the data calculated by the metering module (30) in the step S3 are sent to a server through a wireless communication module (40), and the server (50) analyzes the data so as to judge the working condition of the power factor compensation equipment;
the server (50) analyzing the data comprises the following analysis steps:
step S41, presetting a power factor reference value;
step S42, calculating the average power factor of the electricity side
Step S43, calculating the power Q Can be supplemented which the power factor compensation device can compensate,
Step S44, comparing the average power factor delta cos phi of the electricity consumption side with a power factor reference value; when the delta cos phi is lower than a power factor reference value, judging the working condition of the power factor compensation equipment according to the reactive compensation electric quantity delta Q Tonifying device , the electric load active electric quantity delta P and the electric load reactive electric quantity delta Q; the working conditions comprise insufficient compensation capacity of the reactive compensation equipment, failure of a compensation unit of the reactive compensation equipment, overcompensation of the compensation unit of the reactive compensation equipment and failure of the reactive compensation equipment;
The electricity utilization side is provided with an electricity utilization load adoption point (60);
The output end of the reactive compensation equipment connected with the electricity utilization side is provided with a reactive compensation sampling point (70);
the electricity load sampling module (20) is arranged at an electricity load adoption point (60);
the reactive compensation sampling module (10) is arranged at a reactive compensation sampling point (70);
the monitoring system (100) is provided with at least one.
2. The power factor compensation device operation condition monitoring method according to claim 1, wherein: the calculation formula of the metering module in the step S3 includes:
Q Tonifying device ＝I Tonifying device *U Tonifying device *sinФ,△Q Tonifying device ＝I Tonifying device *U Tonifying device *sinФ*△T；
P＝I*U*cosФ，△P＝I*U*cosФ*△T；
Q＝I*U*sinФ，△Q＝I*U*sinФ*△T。
3. The power factor compensation device operation condition monitoring method according to claim 1, wherein: the actual reactive power Q Actual practice is that of at the power consumer side when the reactive compensation power Q Tonifying device is not being delivered to it by the reactive compensation device is equal to the sum of the load reactive power Q and the reactive compensation power Q Tonifying device .
4. The power factor compensation device operation condition monitoring method according to claim 1, wherein: when Q Actual practice is that of is larger than Q Tonifying device , if Q Can be supplemented is smaller than Q Actual practice is that of , the working condition is that the compensation capacity of the reactive compensation equipment is insufficient; if Q Can be supplemented is larger than Q Actual practice is that of , the working condition is that the compensation unit of the reactive compensation equipment fails;
When Q Actual practice is that of is smaller than Q Tonifying device and Q Can be supplemented is larger than Q Actual practice is that of , then the working condition is that the compensation unit of the reactive compensation device is overcompensated or the reactive compensation device fails.
5. A power factor compensation device operation condition monitoring method according to claim 3, characterized in that: the power factor includes an average power factor or an instantaneous power factor of the power-using side.
6. The power factor compensation device operation condition monitoring method according to claim 1, wherein: the A-phase current of one monitoring system (100) is connected in series to the A-phase of a current loop of the power supply, and the A-phase voltage of one monitoring system (100) is connected to the A-phase of a sampling current in-phase voltage of the power supply; the B-phase current of the other monitoring system (100) is connected in series to an A-phase indicator meter sampling current loop of the reactive compensation equipment, and the B-phase voltage of the monitoring system (100) is connected to the A-phase voltage of one monitoring system (100).
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| CN109802400A (en) * | 2019-01-29 | 2019-05-24 | 宁波大家小家网络科技有限公司 | A kind of method and system of the data analysis and process of low-pressure reactive compensation system |
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