CN109510191B - Power grid quality evaluation method and device - Google Patents
Power grid quality evaluation method and device Download PDFInfo
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- CN109510191B CN109510191B CN201811353767.7A CN201811353767A CN109510191B CN 109510191 B CN109510191 B CN 109510191B CN 201811353767 A CN201811353767 A CN 201811353767A CN 109510191 B CN109510191 B CN 109510191B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention relates to a power grid quality evaluation method and a device, wherein the evaluation method comprises the following steps: acquiring power supply parameters of two ends of a load in a power grid; calculating at least one power supply parameter deviation value according to the power supply parameter; calculating an evaluation score according to each power supply parameter deviation value; and (5) weighting and calculating all the evaluation scores to obtain the power grid quality evaluation scores. According to the embodiment of the invention, the power supply parameters at the two ends of the load in the power grid are obtained, the corresponding power supply parameter deviation values are obtained according to the power supply parameter calculation, the evaluation score of each power supply parameter deviation value is calculated, the power grid quality evaluation score is obtained by calculating each evaluation score according to the weight value, the power supply instruction of the power grid is evaluated, objective parameters are provided for a user to prompt, and the problem of the load caused by poor power supply condition of the power grid is avoided.
Description
Technical Field
The invention relates to the technical field of power supply networks, in particular to a power grid quality evaluation method and device.
Background
The whole of the power substation and the power transmission and distribution line of various voltages in the power system is called a power grid. The power grid comprises three units of power transformation, power transmission and power distribution, wherein the power grid is used for transmitting and distributing electric energy, changing voltage and the household electric power is generally alternating current and single-phase. The different environments of the countries cause different electricity voltages in daily life, and the China mainly uses 220V and 50HZ alternating current.
The 220V and 50HZ alternating current is provided in the power supply network in China, so that the rated voltage of electric equipment matched with the 220V alternating current is 220V, but the power supply network is in a fluctuation state due to various reasons such as areas, the number of electric users and the like, for example, the brightness of lamps can be suddenly increased or darkened sometimes, the brightness is caused by the increase or decrease of the voltage in the power supply network, most users have no strong knowledge or are not clear enough about the quality of the power grid or the safety degree of equipment in a house, and household loads under the rated voltage are easy to damage or cause larger potential safety hazards due to fluctuation of power supply and power supply.
Disclosure of Invention
In order to solve the problems in the prior art, at least one embodiment of the invention provides a power grid quality evaluation method and device.
In a first aspect, an embodiment of the present invention provides a power grid quality evaluation method, where the evaluation method includes:
acquiring power supply parameters of two ends of a load in a power grid;
calculating at least one power supply parameter deviation value according to the power supply parameters;
calculating an evaluation score according to each power supply parameter deviation value;
and (5) weighting and calculating all the evaluation scores to obtain the power grid quality evaluation scores.
Based on the above technical solution, the following improvements can be made in the embodiments of the present invention.
With reference to the first aspect, in a first embodiment of the first aspect, the obtaining a power supply parameter of two ends of a load in the power grid specifically includes:
and acquiring at least one of an actual voltage value, an actual current value and a leakage current value at two ends of a load in the power grid.
The beneficial effects of adopting the further technical scheme are as follows: the power supply end has a larger influence on the work of the load, namely an actual voltage value, an actual current value and a leakage current value, and at least one of the actual voltage value, the actual current value and the leakage current value at two ends of the load in the power grid is detected to serve as a data base for evaluating the quality of the power grid, so that the finally obtained quality evaluation score can provide objective data support for the actual condition of the power grid for users.
With reference to the first embodiment of the first aspect, in a second embodiment of the first aspect, the calculating a power supply deviation according to the power supply parameter specifically includes:
calculating a voltage deviation value and a power grid harmonic error value according to the actual voltage value;
or/and, calculating a current deviation value according to the actual current value;
Or/and calculating a leakage current deviation value according to the leakage current value.
The beneficial effects of adopting the further technical scheme are as follows: corresponding deviation values are calculated according to the collected different data, and corresponding evaluation scores are calculated according to each deviation value, so that the power grid quality evaluation scores in the scheme are comprehensively obtained, and the calculation of the condition of the power grid is realized.
With reference to the second embodiment of the first aspect, in a third embodiment of the first aspect,
calculating the absolute value of the difference between the peak value of the actual voltage value and the preset standard voltage peak value as the voltage deviation value;
calculating to obtain the theoretical amplitude of each subharmonic in preset time according to the actual voltage value, and accumulating the absolute value of the difference between the measured amplitude of each harmonic and the theoretical amplitude to obtain the power grid harmonic error value;
calculating the absolute value of the difference between the peak value of the actual current value and the preset standard current peak value as the current deviation value;
and taking the leakage current value as the leakage current deviation value.
With reference to the third embodiment of the first aspect, in a fourth embodiment of the first aspect, the calculating an evaluation score according to each power supply parameter deviation value includes:
Calculating a first evaluation score according to the voltage deviation value, the voltage deviation preset evaluation score and a preset voltage deviation upper limit value;
and/or calculating a second evaluation score according to the power grid harmonic error value, the power grid harmonic error preset evaluation score and the preset power grid harmonic error upper limit value;
and/or calculating a third evaluation score according to the current deviation value, the preset load margin evaluation score and the preset current deviation upper limit value;
and/or calculating a fourth evaluation score according to the leakage current deviation value, the leakage current preset evaluation score and the preset leakage current upper limit value.
The beneficial effects of adopting the further technical scheme are as follows: according to the deviation values of the collected different data, calculating corresponding evaluation scores according to each deviation value, thereby comprehensively obtaining the power grid quality evaluation scores in the scheme and realizing the calculation of the condition of the power grid.
With reference to the fourth embodiment of the first aspect, in a fifth embodiment of the first aspect, the calculating the first evaluation score according to the voltage deviation value, the voltage deviation preset evaluation score, and the preset voltage deviation upper limit value specifically includes:
comparing the voltage deviation value with a preset voltage deviation upper limit value;
when the voltage deviation value is greater than or equal to a preset voltage deviation upper limit value, the first evaluation is divided into 0;
Or, when the voltage deviation value is smaller than the preset voltage deviation upper limit value, calculating the first evaluation score according to the following calculation formula:
wherein K is 1 For the first evaluation score, K 1t Presetting an evaluation score for the voltage deviation, wherein DeltaV is the voltage deviation value; deltaV up And the preset voltage deviation upper limit value is set.
With reference to the fourth embodiment of the first aspect, in a sixth embodiment of the first aspect, the calculating a second evaluation score according to the grid harmonic error value, a preset evaluation score of the grid harmonic error, and a preset upper limit value of the grid harmonic error specifically includes:
comparing the power grid harmonic error value with a preset power grid harmonic error upper limit value;
when the power grid harmonic error value is greater than or equal to the preset power grid harmonic error upper limit value, the second evaluation is divided into 0;
when the power grid harmonic error value is smaller than the preset power grid harmonic error upper limit value, calculating the second evaluation score according to the following calculation formula:
wherein K is 2 For the second evaluation score, K 2t Presetting an evaluation score, deltaV for the harmonic error of the power grid Harmonic wave A harmonic error value for the power grid; deltaV Harmonic up And presetting an upper limit value of the harmonic error of the power grid.
With reference to the fourth embodiment of the first aspect, in a seventh embodiment of the first aspect, the calculating a third evaluation score according to the current deviation value, a preset load margin evaluation score, and a preset current deviation upper limit value specifically includes:
comparing the current deviation value with a preset current deviation upper limit value;
when the current deviation value is greater than or equal to the preset current deviation upper limit value, the third evaluation is divided into 0;
alternatively, when the current deviation value is smaller than a preset current deviation upper limit value, the third evaluation score is calculated according to the following calculation method:
wherein K is 3 For the third evaluation score, K 3t For the preset load margin evaluation score, deltaI Electric current Is the current bias value; ΔI Allowance up Is a preset current deviation upper limit value.
With reference to the fourth embodiment of the first aspect, in an eighth embodiment of the first aspect, the calculating a fourth evaluation score according to the leakage current deviation value, the leakage current preset evaluation score, and the preset leakage current upper limit value specifically includes:
comparing the leakage current deviation value with the preset leakage current upper limit value;
when the leakage current deviation value is greater than or equal to a preset leakage current upper limit value, the fourth evaluation is divided into 0;
Or, when the leakage current deviation value is smaller than the preset leakage current upper limit value, calculating the fourth evaluation score according to the following calculation formula:
wherein K is 4 For the fourth evaluation score, K 4t Presetting an evaluation score, delta I, for the leakage current Leakage device The leakage current deviation value; ΔI Leakage up And the preset leakage current upper limit value is set.
With reference to the first aspect, in a ninth embodiment of the first aspect, the calculating the power grid quality score by weighting all the scores specifically includes:
and accumulating the evaluation scores to obtain the power grid quality evaluation scores.
With reference to the first aspect, in a tenth embodiment of the first aspect, the power grid quality evaluation method further includes:
and comparing the power grid quality evaluation with a preset evaluation range, and generating different power grid quality prompt messages according to a comparison result to display.
The beneficial effects of adopting the further technical scheme are as follows: and comparing the power grid quality evaluation with a preset evaluation range, generating prompt information according to a comparison result, displaying, and prompting a user under the condition that the power grid quality is poor or good power supply cannot be provided for a load, so that the problem of the load caused by the poor power supply condition of the power grid is avoided.
With reference to the first aspect, in an eleventh embodiment of the first aspect, the power grid quality evaluation method further includes:
and comparing the power grid quality evaluation with a preset evaluation range, generating a prompt message when the power grid quality evaluation score is lower than the preset evaluation range, and sending the prompt message and the power grid quality evaluation score to a user terminal for display.
The beneficial effects of adopting the further technical scheme are as follows: and (3) corners are formed between the power grid quality evaluation and a preset evaluation range, and when the power grid quality evaluation is excessively low, a prompt message is generated and sent to a user terminal to provide the user with poor power grid quality so as to remind the user of processing and avoid dangerous situations or load damage.
With reference to the eleventh embodiment of the first aspect, in a twelfth embodiment of the first aspect, the power grid quality evaluation method further includes:
the user terminal receives an operation instruction and generates a control instruction according to the operation instruction;
and cutting off the power supply at the two ends of the load according to the control instruction.
The beneficial effects of adopting the further technical scheme are as follows: the user terminal receives the operation instruction of the user, generates a control instruction according to the operation instruction, cuts off power supply at two ends of the load according to the control instruction, and timely cuts off connection between the load and the power grid to protect the load when the power supply condition of the power grid is insufficient to meet the requirement of the load.
With reference to the first aspect or any one of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, or twelfth embodiments of the first aspect, in a thirteenth embodiment of the first aspect, the power grid quality evaluation method further includes:
comparing the power grid quality evaluation with a preset evaluation range;
and when the power grid quality evaluation score is lower than the preset evaluation range, cutting off the power supply at the two ends of the load.
The beneficial effects of adopting the further technical scheme are as follows: by comparing the power grid quality evaluation with a preset evaluation range, if the power grid quality evaluation is excessively low, the power supply at the two ends of the load is timely disconnected, the safety of the load is improved, and dangerous situations are avoided.
In a second aspect, an embodiment of the present invention further provides a power grid quality evaluation device, including: a socket housing; further comprises:
the power supply parameter acquisition device is arranged in the socket shell and is respectively connected with the power supply ends of the loads to acquire power supply parameters of the two ends of the loads in the power grid;
and the calculator is arranged in the socket shell, connected with the power supply parameter acquisition device and used for calculating the power grid quality evaluation score according to the power supply parameters.
With reference to the second aspect, in a first embodiment of the second aspect, the power supply parameter obtaining device includes: at least one of the current detecting means, the voltage detecting means, and the leakage current detecting means.
With reference to the second aspect, in a second embodiment of the second aspect, the power grid quality evaluation device further includes: and the wireless communication device is arranged in the socket shell and connected with the calculator.
With reference to the second embodiment of the second aspect, in a third embodiment of the second aspect, the power grid quality evaluation device further includes: and the user terminal is in wireless connection with the wireless communication device and displays the power grid quality evaluation.
With reference to the third embodiment of the second aspect, in a fourth embodiment of the second aspect, the user terminal includes: a control instruction generator;
the power grid quality evaluation device further comprises: an electronic switch arranged on the load power supply end;
the power grid quality evaluation device further comprises: the electronic switch controller is arranged in the socket shell and connected with the electronic switch to control the electronic switch to be turned on or off;
the control instruction generator is connected with the electronic switch controller through the wireless communication device.
With reference to the second aspect, in a fifth embodiment of the second aspect, the power grid quality evaluation device further includes:
a comparator disposed within the receptacle housing and coupled to the calculator;
a control command generator disposed within the receptacle housing and connected to the comparator;
the electronic switch controller is arranged in the socket shell, the input end of the electronic switch controller is connected with the control instruction generator, and the output end of the electronic switch controller is connected with the electronic switch arranged on the load power supply end.
With reference to the second aspect, in a sixth embodiment of the second aspect, the power grid quality evaluation device further includes:
the three-color lamp is arranged on the surface of the socket shell;
the three-color lamp controller is arranged in the socket shell and connected with the three-color lamp and used for controlling the color displayed by the three-color lamp;
and the comparator is arranged in the socket shell, the input end of the comparator is connected with the calculator, and the output end of the comparator is connected with the trichromatic lamp controller.
With reference to the second aspect or the first, second, third, fourth, fifth or sixth embodiment of the second aspect, in a seventh embodiment of the second aspect, the power grid quality evaluation device further includes:
And the display device is arranged on the surface of the socket shell, is connected with the calculator and is used for displaying the power grid quality evaluation.
Compared with the prior art, the technical scheme of the invention has the following advantages: according to the embodiment of the invention, the power supply parameters at the two ends of the load in the power grid are obtained, the corresponding power supply parameter deviation values are obtained according to the power supply parameter calculation, the evaluation score of each power supply parameter deviation value is calculated, the power grid quality evaluation score is obtained by calculating each evaluation score according to the weight value, the power supply instruction of the power grid is evaluated, objective parameters are provided for a user to prompt, and the problem of the load caused by poor power supply condition of the power grid is avoided.
Drawings
Fig. 1 is a schematic flow chart of a power grid quality evaluation method provided by an embodiment of the invention;
fig. 2 is a schematic flow chart of a power grid quality evaluation method according to another embodiment of the present invention;
fig. 3 is a schematic flow chart of a power grid quality evaluation method according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of a power grid quality evaluation method according to another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a power grid quality evaluation system according to another embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a power grid quality evaluation system according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a power grid quality evaluation system according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a power grid quality evaluation system according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of a power grid quality evaluation system according to still another embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the power grid quality evaluation method provided by the embodiment of the invention includes:
s11, acquiring power supply parameters of two ends of a load in a power grid.
In this embodiment, the power supply parameters at both ends of the load include: in the step, at least one of an actual voltage value, an actual current value and a leakage current at two ends of a load in a power grid is obtained, and the actual current value at two ends of the load, the actual voltage value at two ends of the load and the leakage current value at two ends of the load can be collected through a current transformer.
S12, calculating at least one power supply parameter deviation value according to the power supply parameters.
In this embodiment, the voltage at each point of the power supply and distribution system will change with the change of the operation mode and the slow change of the load, and the difference between the actual voltage at each point and the nominal voltage of the system will be referred to as voltage deviation. The voltage deviation is also commonly expressed as a percentage of the nominal voltage of the system, the meaning of the current deviation is consistent with that of the voltage deviation, and the voltage deviation is another condition of parameters in the power grid, because the effective component of the alternating current power grid is the power frequency single frequency, any component different from the power frequency can be called harmonic wave, and the power supply parameter deviation value can be the voltage deviation value and the power grid harmonic wave deviation value calculated according to the actual voltage value, or the current deviation value calculated according to the actual current value, or the leakage current deviation value calculated according to the leakage current value.
For example, calculating the absolute value of the difference between the peak value of the actual voltage value and the preset standard voltage peak value as the voltage deviation value; calculating to obtain the theoretical amplitude of each subharmonic in preset time according to the actual voltage value, and accumulating the absolute value of the difference between the measured amplitude of each subharmonic and the theoretical amplitude to obtain the power grid harmonic error value; calculating the absolute value of the difference between the peak value of the actual current value and the preset standard current peak value as a current deviation value; in order to reduce interference in a switching power supply, an EMI filter circuit must be provided according to national standards by using a leakage current value as a leakage current deviation value. Due to the relation of the EMI circuit, a tiny current exists to the ground after the switch power supply is connected with the mains supply, namely leakage current. If not grounded, the computer housing will have a tingling feel with a hand at 110 volts and will also have an impact on the computer operation. Therefore, the optimal leakage current is zero, and the generated leakage currents are leakage current deviation values.
S13, calculating evaluation scores according to the deviation values of the power supply parameters.
In this embodiment, according to the power supply parameter deviation values in the above steps, the evaluation score of each power supply parameter deviation value is calculated, for example, the larger a power supply parameter deviation value is, the lower the evaluation score corresponding to the power supply parameter deviation value in the power grid should be, so as to implement calculation of the evaluation score according to the power supply parameter deviation value.
For example, the first evaluation score is calculated according to a voltage deviation value, a voltage deviation preset evaluation score and a preset voltage deviation upper limit value, wherein the voltage deviation preset evaluation score can be set according to the influence degree of the voltage deviation on the load operation, and the preset voltage deviation upper limit value can be an upper limit value of the load operation voltage or an absolute value of a difference value between the lower limit value and a load rated voltage value.
The method for calculating the first evaluation score comprises the following steps:
s21, comparing the voltage deviation value with a preset voltage deviation upper limit value.
S22a, when the voltage deviation value is larger than or equal to the preset voltage deviation upper limit value, the first evaluation is divided into 0.
In this embodiment, if the voltage deviation value is greater than or equal to the preset voltage deviation upper limit value, it is indicated that the supply voltage in the power grid at this time is already greater than or equal to the upper limit value or less than or equal to the lower limit value of the load operation voltage, and at this time, the load should not be connected to the power grid, so the first evaluation corresponding to the voltage deviation value is divided into zero.
S22b, or when the voltage deviation value is smaller than the preset voltage deviation upper limit value, calculating a first evaluation score according to the following calculation formula:
wherein K is 1 For the first evaluation score, K 1t Presetting an evaluation score for the voltage deviation, wherein DeltaV is a voltage deviation value; deltaV up Is the preset voltage deviation upper limit value.
In this embodiment, when the voltage deviation value is smaller than the preset voltage deviation upper limit value, the first evaluation score is calculated according to the proportion of the voltage deviation value to the preset voltage deviation upper limit value.
For example, the second evaluation score is calculated according to the power grid harmonic error value, the power grid harmonic error preset evaluation score and the preset power grid harmonic error upper limit value, and specifically, the method for calculating the second evaluation score includes:
s31, comparing the power grid harmonic error value with a preset power grid harmonic error upper limit value.
S32a, when the power grid harmonic error value is greater than or equal to the preset power grid harmonic error upper limit value, the second evaluation is divided into 0.
In this embodiment, if the power grid harmonic error value is greater than or equal to the preset power grid harmonic error upper limit value, it is indicated that the power grid harmonic in the power grid at this time is already greater than or equal to the preset power grid harmonic upper limit value or less than or equal to the lower limit value of the load operation, and the load should not be connected to the power grid at this time, so that the second evaluation corresponding to the power grid harmonic error value is divided into zero.
S32b, when the power grid harmonic error value is smaller than the preset power grid harmonic error upper limit value, calculating a second evaluation score according to the following calculation formula:
wherein K is 2 For the second evaluation score, K 2t The method comprises the steps of presetting evaluation scores, delta V for harmonic errors of a power grid Harmonic wave Is the power grid harmonic error value; deltaV Harmonic up And the upper limit value of the harmonic error of the power grid is preset.
In this embodiment, when the power grid harmonic error value is smaller than the preset power grid harmonic error upper limit value, the second evaluation score is calculated according to the proportion of the power grid harmonic error value to the preset power grid harmonic error upper limit value.
For example, a third evaluation score is calculated according to the current deviation value, the preset load margin evaluation score and the preset current deviation upper limit value, and specifically, the method for calculating the third evaluation score includes:
s41, comparing the current deviation value with a preset current deviation upper limit value.
S42a, when the current deviation value is greater than or equal to the preset current deviation upper limit value, the third evaluation is classified as 0.
In this embodiment, if the current deviation value is greater than or equal to the preset current deviation upper limit value, it is indicated that the current deviation value in the power grid at this time is already greater than or equal to the current upper limit value or less than or equal to the current lower limit value of the load operation, and at this time the load should not be connected to the power grid, so the third evaluation corresponding to the current deviation value is divided into zero.
S42b, or, when the current deviation value is smaller than the preset current deviation upper limit value, calculating a third evaluation score according to the following calculation method:
wherein K is 3 For the third evaluation score, K 3t For a preset load margin evaluation score, ΔI Electric current Is a current deviation value; ΔI Allowance up Is a preset current deviation upper limit value.
In this embodiment, when the current deviation value is smaller than the preset current deviation upper limit value, the third evaluation score is calculated according to the proportion of the current deviation value to the preset current deviation upper limit value.
For example, the method for calculating the fourth evaluation score according to the leakage current deviation value, the leakage current preset evaluation score and the preset leakage current upper limit value specifically includes:
s51, comparing the leakage current deviation value with a preset leakage current upper limit value;
s52a, when the leakage current deviation value is greater than or equal to the preset leakage current upper limit value, the fourth evaluation is divided into 0.
In this embodiment, if the leakage current deviation value is greater than or equal to the preset leakage current upper limit value, it is indicated that the leakage current deviation value in the power grid at this time is greater than or equal to the leakage current upper limit value or less than or equal to the lower limit value of the load operation, and the load should not be connected to the power grid at this time, so the fourth evaluation corresponding to the leakage current deviation value is divided into zero.
S52b, or when the leakage current deviation value is smaller than the preset leakage current upper limit value, calculating a fourth evaluation score according to the following calculation formula:
wherein K is 4 For the fourth evaluation score, K 4t For the leakage current, a predetermined evaluation score, ΔI Leakage device Is the leakage current deviation value; ΔI Leakage up The leakage current upper limit value is preset.
In this embodiment, when the leakage current deviation value is smaller than the preset leakage current upper limit value, a fourth evaluation score is calculated according to the proportion of the leakage current deviation value to the preset leakage current upper limit value.
And S14, weighting and calculating all the evaluation scores to obtain the power grid quality evaluation scores.
In this embodiment, the power grid quality evaluation score obtained by weighting and calculating all the evaluation scores obtained by the foregoing embodiment may be, for example, weighted according to importance degrees of power supply parameters corresponding to different evaluation scores, and the evaluation scores are calculated according to weights to obtain the power grid quality evaluation score.
In this embodiment, the power grid quality evaluation method further includes:
s15, comparing the power grid quality evaluation with a preset evaluation range.
S16, when the power grid quality evaluation score is lower than a preset evaluation range, power supply at two ends of the load is disconnected.
In the embodiment, when the power grid quality evaluation score is lower than a preset evaluation range, the power supply at two ends of the load is disconnected, the condition that the load is damaged due to poor power grid power supply quality is avoided, and the safety of the load is improved.
As shown in fig. 2, the embodiment of the invention further provides a power grid quality evaluation method, which is different from the evaluation method shown in fig. 1 in that:
s21, acquiring power supply parameters of two ends of a load in a power grid.
In this embodiment, the power supply parameters at both ends of the load include: in the step, at least one of an actual voltage value, an actual current value and a leakage current at two ends of a load in a power grid is obtained, and the actual current value at two ends of the load, the actual voltage value at two ends of the load and the leakage current value at two ends of the load can be collected through a current transformer.
S22, calculating at least one power supply parameter deviation value according to the power supply parameters.
In this embodiment, the voltage at each point of the power supply and distribution system will change with the change of the operation mode and the slow change of the load, and the difference between the actual voltage at each point and the nominal voltage of the system will be referred to as voltage deviation. The voltage deviation is also commonly expressed as a percentage of the nominal voltage of the system, the meaning of the current deviation is consistent with that of the voltage deviation, and the voltage deviation is another condition of parameters in the power grid, because the effective component of the alternating current power grid is the power frequency single frequency, any component different from the power frequency can be called harmonic wave, and the power supply parameter deviation value can be the voltage deviation value and the power grid harmonic wave deviation value calculated according to the actual voltage value, or the current deviation value calculated according to the actual current value, or the leakage current deviation value calculated according to the leakage current value.
S23, calculating evaluation scores according to the deviation values of the power supply parameters.
In this embodiment, according to the power supply parameter deviation values in the above steps, the evaluation score of each power supply parameter deviation value is calculated, for example, the larger a power supply parameter deviation value is, the lower the evaluation score corresponding to the power supply parameter deviation value in the power grid should be, so as to implement calculation of the evaluation score according to the power supply parameter deviation value.
And S24, weighting and calculating all the evaluation scores to obtain the power grid quality evaluation scores.
In this embodiment, the power grid quality evaluation score obtained by weighting all the evaluation scores obtained by the calculation in the above embodiment may be, for example, weighted according to the importance degrees of the power supply parameters corresponding to different evaluation scores, and the evaluation scores are calculated according to the weights to obtain the power grid quality evaluation score.
S25, comparing the power grid quality evaluation with a preset evaluation range, and generating different power grid quality prompt messages according to the comparison result to display.
In this embodiment, by comparing the power grid quality evaluation with the preset evaluation range, different power grid quality prompt messages are generated according to the comparison result and displayed, for example, the power grid quality is poor, the prompt message of the load connected with the power grid is suggested to be disconnected, the power grid quality is good, and the prompt message of the load can be used.
As shown in fig. 3, the embodiment of the invention further provides a power grid quality evaluation method, which is different from the evaluation method shown in fig. 1 in that:
s31, acquiring power supply parameters of two ends of a load in a power grid.
In this embodiment, the power supply parameters at both ends of the load include: in the step, at least one of an actual voltage value, an actual current value and a leakage current at two ends of a load in a power grid is obtained, and the actual current value at two ends of the load, the actual voltage value at two ends of the load and the leakage current value at two ends of the load can be collected through a current transformer.
S32, calculating at least one power supply parameter deviation value according to the power supply parameters.
In this embodiment, the voltage at each point of the power supply and distribution system will change with the change of the operation mode and the slow change of the load, and the difference between the actual voltage at each point and the nominal voltage of the system will be referred to as voltage deviation. The voltage deviation is also commonly expressed as a percentage of the nominal voltage of the system, the meaning of the current deviation is consistent with that of the voltage deviation, and the voltage deviation is another condition of parameters in the power grid, because the effective component of the alternating current power grid is the power frequency single frequency, any component different from the power frequency can be called harmonic wave, and the power supply parameter deviation value can be the voltage deviation value and the power grid harmonic wave deviation value calculated according to the actual voltage value, or the current deviation value calculated according to the actual current value, or the leakage current deviation value calculated according to the leakage current value.
S33, calculating evaluation scores according to the power supply parameter deviation values.
In this embodiment, according to the power supply parameter deviation values in the above steps, the evaluation score of each power supply parameter deviation value is calculated, for example, the larger a power supply parameter deviation value is, the lower the evaluation score corresponding to the power supply parameter deviation value in the power grid should be, so as to implement calculation of the evaluation score according to the power supply parameter deviation value.
And S34, weighting and calculating all the evaluation scores to obtain the power grid quality evaluation scores.
In this embodiment, the power grid quality evaluation score obtained by weighting all the evaluation scores obtained by the calculation in the above embodiment may be, for example, weighted according to the importance degrees of the power supply parameters corresponding to different evaluation scores, and the evaluation scores are calculated according to the weights to obtain the power grid quality evaluation score.
S35, comparing the power grid quality evaluation with a preset evaluation range, generating a prompt message when the power grid quality evaluation score is lower than the preset evaluation range, and sending the prompt message and the power grid quality evaluation score to a user terminal for display.
In this embodiment, when the power grid quality score is lower than a preset threshold range, a prompt message is generated and sent to the user terminal, so as to realize remote monitoring of the power grid quality.
In this embodiment, the user terminal receives the operation instruction, and generates a control instruction according to the operation instruction; and cutting off the power supply at two ends of the load according to the control instruction.
In this embodiment, according to the user terminal receiving the operation instruction, generating the control instruction according to the operation instruction, and disconnecting the power supply at both ends of the load by the control instruction, so as to remotely control the disconnection of the load and improve the safety of the load.
As shown in fig. 4, the embodiment of the present invention further provides a power grid quality evaluation device, including: a socket housing.
In this embodiment, the power grid quality evaluation device further includes: the power supply parameter acquisition device is arranged in the socket shell and is respectively connected with the power supply ends of the loads to acquire power supply parameters of the two ends of the loads in the power grid. In this embodiment, the power supply parameters at both ends of the load include: in the step, at least one of an actual voltage value, an actual current value and a leakage current at two ends of a load in a power grid is obtained, and the actual current value at two ends of the load, the actual voltage value at two ends of the load and the leakage current value at two ends of the load can be collected through a current transformer.
In this embodiment, the power grid quality evaluation device further includes: and the calculator is arranged in the socket shell, connected with the power supply parameter acquisition device and used for calculating the power grid quality evaluation score according to the power supply parameters.
In this embodiment, the calculator calculates at least one power supply parameter deviation value according to the power supply parameter, and in this embodiment, changing the operation mode and slowly changing the load of the power supply and distribution system will change the voltage at each point of the power supply and distribution system, where the difference between the actual voltage at each point and the nominal voltage of the system is called as the voltage deviation. The voltage deviation is also commonly expressed as a percentage of the nominal voltage of the system, the meaning of the current deviation is consistent with that of the voltage deviation, and the voltage deviation is another condition of parameters in the power grid, because the effective component of the alternating current power grid is the power frequency single frequency, any component different from the power frequency can be called harmonic wave, and the power supply parameter deviation value can be the voltage deviation value and the power grid harmonic wave deviation value calculated according to the actual voltage value, or the current deviation value calculated according to the actual current value, or the leakage current deviation value calculated according to the leakage current value.
In the present embodiment, the calculator calculates the evaluation score from each of the power supply parameter deviation values, respectively. For example, according to the power supply parameter deviation values in the above steps, the evaluation score of each power supply parameter deviation value is calculated respectively, for example, the larger a certain power supply parameter deviation value is, the lower the evaluation score corresponding to the power supply parameter deviation value in the power grid should be, so as to realize the calculation of the evaluation score according to the power supply parameter deviation value.
In this embodiment, the calculator calculates the grid quality score by weighting all scores. For example, the power grid quality evaluation score obtained by weighting and calculating all the evaluation scores obtained by the embodiment can be set with weights according to the importance degrees of the power supply parameters corresponding to different evaluation scores, and the evaluation scores are calculated according to the weights to obtain the power grid quality evaluation score.
As shown in fig. 5, in the present embodiment, the power grid quality evaluation device further includes: and the wireless communication device is arranged in the socket shell and connected with the calculator. The power grid quality evaluation device further comprises: and the user terminal is in wireless connection with the wireless communication device and displays the power grid quality evaluation. And the power grid quality evaluation calculated by the calculator is sent to the user terminal for display through the wireless communication device connected with the calculator.
As shown in fig. 6, in the present embodiment, the user terminal includes: a control instruction generator; the power grid quality evaluation device further comprises: an electronic switch arranged on the power supply end of the load; the power grid quality evaluation device further comprises: the electronic switch controller is arranged in the socket shell and connected with the electronic switch to control the electronic switch to be turned on or off; the control instruction generator is connected with the electronic switch controller through the wireless communication device. The user terminal is also provided with an operation detection device, and the remote turn-off of the power supply to the load is realized by detecting the operation of the user, generating a control instruction according to the control instruction generator and sending the control instruction to the electronic switch controller on the power supply end of the load and controlling the electronic switch to be turned on or off.
As shown in fig. 7, in the present embodiment, the power grid quality evaluation device further includes: the comparator is arranged in the socket shell and connected with the calculator; a control command generator arranged in the socket housing and connected with the comparator; the electronic switch controller is arranged in the socket shell, the input end of the electronic switch controller is connected with the control instruction generator, and the output end of the electronic switch controller is connected with the electronic switch arranged on the load power supply end. The socket shell is internally provided with a comparator connected with the calculator, the power grid quality evaluation is compared with a preset threshold range through the comparator, when the power grid quality evaluation is smaller than the preset threshold range, a control instruction is generated through the control instruction generator and is sent to the electronic switch controller, and the electronic switch controller is used for controlling the electronic switch to disconnect the connection between the load and the power grid, so that the load is prevented from being damaged due to poor power supply condition.
As shown in fig. 8, in the present embodiment, the power grid quality evaluation device further includes: the three-color lamp is arranged on the surface of the socket shell; the three-color lamp controller is arranged in the socket shell and connected with the three-color lamp to control the color displayed by the three-color lamp; and the comparator is arranged in the socket shell, the input end of the comparator is connected with the calculator, and the output end of the comparator is connected with the trichromatic lamp controller. And comparing the power grid quality evaluation with a preset threshold range through a comparator, and respectively controlling the three-color lamps to display different colors by the three-color lamp controller according to the comparison result of the comparator so as to realize the prompt of a user.
As shown in fig. 9, in the present embodiment, the power grid quality evaluation device further includes: and the display device is arranged on the surface of the socket shell, connected with the calculator and used for displaying the power grid quality evaluation.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (21)
1. A power grid quality evaluation method, characterized in that the evaluation method comprises:
acquiring power supply parameters of two ends of a load in a power grid, wherein the power supply parameters comprise: an actual voltage value;
calculating at least one power supply parameter deviation value according to the power supply parameter, including:
calculating the absolute value of the difference between the peak value of the actual voltage value and the preset standard voltage peak value as a voltage deviation value;
calculating an evaluation score according to each power supply parameter deviation value, wherein the evaluation score comprises: a first score, the first score determined by:
Comparing the voltage deviation value with a preset voltage deviation upper limit value;
when the voltage deviation value is greater than or equal to a preset voltage deviation upper limit value, the first evaluation is divided into 0;
or, when the voltage deviation value is smaller than the preset voltage deviation upper limit value, calculating the first evaluation score according to the following calculation formula:
；
wherein,for the first evaluation score, +.>Presetting an evaluation score for the voltage deviation, +.>Is the voltage deviation value;an upper limit value of the preset voltage deviation;
and (5) weighting and calculating all the evaluation scores to obtain the power grid quality evaluation scores.
2. The method for evaluating the quality of a power grid according to claim 1, wherein the obtaining the power supply parameters of the two ends of the load in the power grid specifically comprises:
and acquiring at least one of an actual voltage value, an actual current value and a leakage current value at two ends of a load in the power grid.
3. The power grid quality evaluation method according to claim 2, wherein the calculating a power supply deviation according to the power supply parameter specifically includes:
calculating a voltage deviation value and a power grid harmonic error value according to the actual voltage value;
or/and, calculating a current deviation value according to the actual current value;
Or/and calculating a leakage current deviation value according to the leakage current value.
4. The method for evaluating the quality of a power grid according to claim 3, wherein,
calculating to obtain the theoretical amplitude of each subharmonic in preset time according to the actual voltage value, and accumulating the absolute value of the difference between the measured amplitude of each harmonic and the theoretical amplitude to obtain the power grid harmonic error value;
calculating the absolute value of the difference between the peak value of the actual current value and the preset standard current peak value as the current deviation value;
and taking the leakage current value as the leakage current deviation value.
5. The power grid quality evaluation method according to claim 4, wherein the calculating the evaluation score according to each power supply parameter deviation value comprises:
calculating a first evaluation score according to the voltage deviation value, the voltage deviation preset evaluation score and a preset voltage deviation upper limit value;
and/or calculating a second evaluation score according to the power grid harmonic error value, the power grid harmonic error preset evaluation score and the preset power grid harmonic error upper limit value;
and/or calculating a third evaluation score according to the current deviation value, the preset load margin evaluation score and the preset current deviation upper limit value;
And/or calculating a fourth evaluation score according to the leakage current deviation value, the leakage current preset evaluation score and the preset leakage current upper limit value.
6. The power grid quality evaluation method according to claim 5, wherein the calculating the second evaluation score according to the power grid harmonic error value, the power grid harmonic error preset evaluation score and the preset power grid harmonic error upper limit value specifically comprises:
comparing the power grid harmonic error value with a preset power grid harmonic error upper limit value;
when the power grid harmonic error value is greater than or equal to the preset power grid harmonic error upper limit value, the second evaluation is divided into 0;
when the power grid harmonic error value is smaller than the preset power grid harmonic error upper limit value, calculating the second evaluation score according to the following calculation formula:
；
wherein,for the second evaluation score, +.>Presetting an evaluation score, namely +_for the harmonic errors of the power grid>A harmonic error value for the power grid; />And presetting an upper limit value of the harmonic error of the power grid.
7. The power grid quality evaluation method according to claim 5, wherein the calculating a third evaluation score according to the current deviation value, a preset load margin evaluation score and a preset current deviation upper limit value specifically comprises:
Comparing the current deviation value with a preset current deviation upper limit value;
when the current deviation value is greater than or equal to the preset current deviation upper limit value, the third evaluation is divided into 0;
alternatively, when the current deviation value is smaller than a preset current deviation upper limit value, the third evaluation score is calculated according to the following calculation method:
；
wherein,for the third evaluation score, +.>For the preset load margin evaluation score, < >>Is the current bias value; />Is a preset current deviation upper limit value.
8. The power grid quality evaluation method according to claim 5, wherein the calculating a fourth evaluation score according to the leakage current deviation value, the leakage current preset evaluation score and the preset leakage current upper limit value specifically comprises:
comparing the leakage current deviation value with the preset leakage current upper limit value;
when the leakage current deviation value is greater than or equal to a preset leakage current upper limit value, the fourth evaluation is divided into 0;
or, when the leakage current deviation value is smaller than the preset leakage current upper limit value, calculating the fourth evaluation score according to the following calculation formula:
；
wherein,for the fourth evaluation score, +.>Presetting an evaluation score for the leakage current,/for the leakage current >The leakage current deviation value; />And the preset leakage current upper limit value is set.
9. The power grid quality evaluation method according to claim 1, wherein the step of weighting all the evaluation scores to obtain power grid quality evaluation scores specifically comprises the steps of:
and accumulating the evaluation scores to obtain the power grid quality evaluation scores.
10. The power grid quality evaluation method according to claim 1, further comprising:
and comparing the power grid quality evaluation with a preset evaluation range, and generating different power grid quality prompt messages according to a comparison result to display.
11. The power grid quality evaluation method according to claim 1, further comprising:
and comparing the power grid quality evaluation with a preset evaluation range, generating a prompt message when the power grid quality evaluation score is lower than the preset evaluation range, and sending the prompt message and the power grid quality evaluation score to a user terminal for display.
12. The power grid quality assessment method according to claim 11, further comprising:
The user terminal receives an operation instruction and generates a control instruction according to the operation instruction;
and cutting off the power supply at the two ends of the load according to the control instruction.
13. The power grid quality evaluation method according to any one of claims 1 to 12, characterized in that the power grid quality evaluation method further comprises:
comparing the power grid quality evaluation with a preset evaluation range;
and when the power grid quality evaluation score is lower than the preset evaluation range, cutting off the power supply at the two ends of the load.
14. The power grid quality evaluation device is characterized by being used for realizing the power grid quality evaluation method according to any one of claims 1-13, and comprises the following steps: a socket housing; further comprises:
the power supply parameter acquisition device is arranged in the socket shell and is respectively connected with the power supply ends of the loads to acquire power supply parameters of the two ends of the loads in the power grid;
and the calculator is arranged in the socket shell, connected with the power supply parameter acquisition device and used for calculating the power grid quality evaluation score according to the power supply parameters.
15. The power grid quality evaluation device according to claim 14, wherein the power supply parameter acquisition device includes: at least one of the current detecting means, the voltage detecting means, and the leakage current detecting means.
16. The power grid quality evaluation device according to claim 14, further comprising: and the wireless communication device is arranged in the socket shell and connected with the calculator.
17. The power grid quality evaluation device according to claim 16, further comprising: and the user terminal is in wireless connection with the wireless communication device and displays the power grid quality evaluation.
18. The power grid quality evaluation device of claim 17, wherein the user terminal comprises: a control instruction generator;
the power grid quality evaluation device further comprises: an electronic switch arranged on the load power supply end;
the power grid quality evaluation device further comprises: the electronic switch controller is arranged in the socket shell and connected with the electronic switch to control the electronic switch to be turned on or off;
the control instruction generator is connected with the electronic switch controller through the wireless communication device.
19. The power grid quality evaluation device according to claim 14, further comprising:
A comparator disposed within the receptacle housing and coupled to the calculator;
a control command generator disposed within the receptacle housing and connected to the comparator;
the electronic switch controller is arranged in the socket shell, the input end of the electronic switch controller is connected with the control instruction generator, and the output end of the electronic switch controller is connected with the electronic switch arranged on the load power supply end.
20. The power grid quality evaluation device according to claim 14, further comprising:
the three-color lamp is arranged on the surface of the socket shell;
the three-color lamp controller is arranged in the socket shell and connected with the three-color lamp and used for controlling the color displayed by the three-color lamp;
and the comparator is arranged in the socket shell, the input end of the comparator is connected with the calculator, and the output end of the comparator is connected with the trichromatic lamp controller.
21. The power grid quality evaluation device according to any one of claims 14 to 20, further comprising:
and the display device is arranged on the surface of the socket shell, is connected with the calculator and is used for displaying the power grid quality evaluation.
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