CN113156202A - Non-invasive identification method and device for charging of battery car based on harmonic wave and time characteristics - Google Patents
Non-invasive identification method and device for charging of battery car based on harmonic wave and time characteristics Download PDFInfo
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Abstract
The invention discloses a non-invasive identification method and a non-invasive identification device for charging of a storage battery car based on harmonic wave and time characteristics, which comprises the following steps: when the incoming line of the main power supply at the user house-entry side is started or stopped with load, the active power variation deltaPJudging whether the storage battery car is charged within the range of the charging power threshold value of the storage battery car, and entering a step two; otherwise, judging whether the battery car is charged; step two: calculating the total harmonic content of currentK2, 3, 5, 7 th harmonic contentK j ，j=2、3、5、7When the total harmonic of the current is equal tojIf the subharmonic content meets the judgment standard, judging that the battery car can be charged, starting timing, and entering a third step; otherwise, judging whether the battery car is charged; step three: when the load continues to operateTIf the voltage exceeds the set threshold value, the storage battery car is judged to be charged; otherwise, judging that the battery car is not charged. The invention can charge the battery car quickly,Accurate non-invasive identification, simple and economic, and easy popularization and application.
Description
Technical Field
The invention relates to a non-invasive identification method and device for charging of a storage battery car based on harmonic wave and time characteristics, and belongs to the technical field of intelligent power utilization.
Background
Along with the development of modern transportation tools, the storage battery car has the advantages of small size, convenience in parking, low travel cost and the like, is a preferred choice for short-distance travel of many families, and brings great convenience to travel of people due to the production of the storage battery car. At present, the number of the storage battery cars in China is huge and exceeds 3 hundred million. The storage battery car provides convenience for residents to go out, but due to the lack of parking charging standards and supervision, nonstandard charging behaviors such as cart entering a home, private wire pulling, illegal storage battery transformation and the like occur, various accidents caused by the storage battery car are increased year by year in recent years, and in the accidents, the fire accidents caused by indoor charging of the storage battery car occupy a large proportion, and the life and property safety of people is seriously influenced.
At present, the battery cars are forbidden to be charged in public areas such as safety exits, staircases, shared corridors and the like in buildings mainly by means of safety management regulations, propaganda and the like. Through the property patrol, the illegal charging of private pull wires in a public area can be found, but the timeliness cannot be guaranteed. And a timely and effective discovery and supervision means is lacked for indoor charging.
The non-invasive load identification technology obtains fine-grained power load categories and behavior data by monitoring and decomposing total load data of a user, analyzes and obtains a power consumption behavior rule of the user, can avoid the difficult problems of installation and maintenance caused by an invasive load monitoring system to a certain extent, and reduces the interference on the production and life of the user as much as possible. However, the prior art does not have a non-invasive identification method which can accurately, effectively and quickly identify the charging of the battery car.
In summary, a new technical scheme is needed for non-invasive identification of charging behavior of the battery car, and a management basis is provided for finding out illegal charging of the battery car.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a non-invasive identification method and device for charging of a battery car based on harmonic wave and time characteristics, and solves the problem that the charging of the battery car can be accurately, effectively and quickly found without entering residents.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a non-invasive identification method for charging of a storage battery car based on harmonic wave and time characteristics comprises the following steps:
the method comprises the following steps: when the incoming line of the main power supply of the user entering the house is started and stopped under the condition that the active power variation delta P is within the threshold range of the charging power of the battery car, entering a second step;
step two: calculating the total harmonic content K of the current, 2, 3, 5 and 7 times of harmonic content KjWhen the content of the total current harmonic and the content of the jth harmonic meet the judgment standard, starting timing to obtain the continuous load operation time T, and entering a third step;
step three: and when the continuous operation time T of the load exceeds a set threshold value, determining that the battery car is charged.
The utility model provides a storage battery car non-invasive identification device that charges based on harmonic content and time characteristic, includes following module:
a power discrimination module: the harmonic discrimination module is used for entering a harmonic discrimination module when a load starting and stopping of a main power inlet wire of a user house-entering side occurs and the active power variation delta P is within the range of a charging power threshold of the storage battery car;
a harmonic discrimination module: for calculating the total harmonic content K, 2, 3, 5, 7 harmonic content K of currentjWhen the content of the total current harmonic and the content of the jth harmonic meet the judgment standard, starting timing to obtain the continuous load operation time T, and entering an operation time judgment module;
an operating time judging module: and when the continuous operation time T of the load exceeds a set threshold value, determining that the battery car is charged.
Preferably, the charging power threshold of the electromobile is set to be 90W < delta P < 400W.
As a preferred scheme, the judgment standard in the step two is that the total harmonic content of the current meets 90 percent<K<125 percent, and the content of 2-order harmonic meets K2<1% and the 3 rd harmonic content satisfies K3>70% and satisfies K3>K5>K7>K2And judging that the storage battery car can be charged, and starting timing, otherwise, judging that the storage battery car is not charged.
Preferably, the load continuous operation time threshold in the third step is set to be 5 minutes.
As a preferred scheme, the calculation formula of the total harmonic content K of the current is as follows:
wherein, Delta I is the current effective value variable quantity of the incoming line of the main power supply at the user's house-entering sidebaseThe variation of the fundamental wave current value of the incoming line of the main power supply at the user house-entering side is obtained;
2-7 th harmonic content KjThe calculation formula of (2) is as follows:
wherein, Delta IjthdAnd j harmonic current value variable quantity of the incoming line of the main power supply at the user entrance side.
Preferably, the active power variation Δ P, the current effective value variation Δ I, and the fundamental current value variation Δ IbaseCurrent value change Δ I of 2, 3, 5, 7 th harmonicjthdThe method comprises the steps that the sampling frequency is calculated according to a voltage sampling sequence u and a current sampling sequence i, the voltage sampling sequence u and the current sampling sequence i are sampled according to the voltage and the current of a main power supply incoming line of a user house-entering side, and the sampling frequency is not less than 800 Hz.
Has the advantages that: according to the non-invasive identification method and device for charging of the storage battery car based on the harmonic wave and the time characteristic, the storage battery car is rapidly and accurately non-invasively identified based on the harmonic wave content and the time characteristic.
Drawings
Fig. 1 is a general flowchart of the non-intrusive method and apparatus for identifying charging of a battery car based on harmonic and time characteristics according to the present invention.
Fig. 2 is a schematic diagram of the active power characteristics of the battery car during charging.
Fig. 3 is a schematic diagram of the harmonic characteristics of the current during charging of the battery car according to the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention provides a non-invasive identification method and a non-invasive identification device for charging of a storage battery car based on harmonic wave and time characteristics, wherein the non-invasive identification method comprises the following steps:
the method comprises the following steps: sampling the voltage and the current of a main power supply inlet wire at a user house-entering side, wherein the sampling frequency is not less than 800Hz, and forming a voltage sampling sequence u and a current sampling sequence i;
step two: according to voltage sampling sequence u and current sampling sequence i, calculate active power, electric current, 2 ~ 7 times harmonic current sequence, according to active power, electric current, 2 ~ 7 times harmonic current sequence, open through power change monitoring load and stop, calculate the load variation, include: active power variation amount Δ P, current effective value variation amount Δ I, fundamental current value variation amount Δ Ibase2-7 harmonic current value variation delta Ijthd(j＝2～7)；
Step three: when the active power variation delta P is within the range of the charging power threshold value of the battery car, judging that the battery car is likely to be charged, and entering the step four; otherwise, judging whether the battery car is charged;
step four: calculating the total harmonic content K of the current and the harmonic content K of 2-7 timesj(j is 2-7), when the total current harmonic and the jth harmonic content meet the judgment standard, judging that the battery car can be charged, starting timing, and entering a fifth step; otherwise, judging whether the battery car is charged;
step five: when the continuous operation time T of the load exceeds a set threshold value, determining that the battery car is charged; otherwise, judging that the battery car is not charged.
In the third step, the active power variation satisfies 90W < delta P <400W, and the storage battery car is judged to be charged, otherwise, the storage battery car is not charged.
The four steps of the method have the discrimination standard that the total harmonic content of the current meets 90 percent<K<125 percent, and the content of 2-order harmonic meets K2<1% and the 3 rd harmonic content satisfies K3>70% and satisfies K3>K5>K7>K2And judging that the storage battery car can be charged, and starting timing, otherwise, judging that the storage battery car is not charged.
In the fifth step, the load continuous operation time threshold is set to 5 minutes.
The preferred calculation formula for the total harmonic content K of the current is:
the preferable content K of 2-7 harmonicsjThe calculation formula of (2) is as follows:
example 1:
as shown in fig. 1, the present invention provides a non-invasive identification method and device for charging a battery car based on harmonic and time characteristics, comprising the following steps:
the method comprises the following steps: sampling the voltage and the current of a main power supply inlet wire at a user house-entering side, wherein the sampling frequency is 6400Hz, and forming a voltage sampling sequence u and a current sampling sequence i;
step two: according to voltage sampling sequence u and current sampling sequence i, calculate active power, electric current, 2 ~ 7 times harmonic current sequence, start through power change monitoring load and stop, calculate load variation, include: active power variation amount Δ P, current effective value variation amount Δ I, fundamental current value variation amount Δ Ibase2-7 harmonic current value variation delta Ijthd(j＝2～7)；
According to the voltage sampling sequence u and the current sampling sequence i, the current, the active power, the fundamental current and the 2-7 harmonic current values in each power frequency period are calculated through FFT (fast Fourier transform), and the active power, the current and the 2-7 harmonic current sequences are formed. In a time window of 100ms, when the active power change exceeds 60W, judging that the load starts or stops, and recording the power and current values before the load change starts; and moving a time window, judging that the load reaches a steady state when the active power change is less than 30W in the time window of 100ms, recording the power and current values when the load reaches the steady state, and calculating the load change amount.
Please refer toAs shown in fig. 2, the active power P of the circuit before charging of the battery car0When the charging of the battery car is started to reach the steady state, the active power P of the line is equal to 0W1225W, charging active power variation delta P of the battery car is P1-P0＝225W。
Referring to FIG. 3, the effective current value I of the circuit before charging of the battery car_0Fundamental current Ibase_0Second harmonic current I2Thd_0Third harmonic current I3Thd_0Fifth harmonic current I5Thd_0Seventh harmonic current I7Thd_0Are all approximately equal to 0A. Effective line current value I after battery car starts to charge and reaches steady state_11.483A, basic Current Ibase_11.024A, second harmonic current I2Thd_10.004A, third harmonic current I3Thd_10.841A, fifth harmonic current I5Thd_10.562A, seventh harmonic current I7Thd_1＝0.297A。
Effective value change quantity delta I of charging current of battery car is I_1-I_0＝1.483A。
Fundamental current variation Δ Ibase＝Ibase_1-Ibase_0＝1.024A。
Second harmonic current variation Δ I2Thd＝I2Thd_1-I2Thd_0＝0.004A。
Third harmonic current variation Δ I3Thd＝I3Thd_1-I3Thd_0＝0.841A。
Fifth harmonic current variation Δ I5Thd＝I5Thd_1-I5Thd_0＝0.562A。
Seventh harmonic current variation Δ I7Thd＝I7Thd_1-I7Thd_0＝0.297A。
Step three: when the active power variation delta P is within the charging power threshold range of the battery car, namely the active power variation meets the condition that the active power variation is more than 90W and less than delta P and less than 400W, judging that the battery car is possibly charged, and entering the step four; otherwise, judging whether the battery car is charged; and D, judging that the battery car is possibly charged within the range of the charging power threshold value of the battery car when the delta P obtained by calculation in the step two is 225W, and entering the step four.
Step four: calculating the total harmonic content K of the current and the harmonic content K of 2-7 timesj(j is 2-7), and when the harmonic content is within a threshold value, namely the total harmonic content of the current meets 90%<K<125 percent, and the content of 2-order harmonic meets K2<1% and the 3 rd harmonic content satisfies K3>70% and satisfies K3>K5>K7>K2If yes, judging that the storage battery car is possibly charged, starting timing, and entering a fifth step; otherwise, judging that the battery car is not charged.
Wherein the total harmonic content of the current
Second harmonic current content
Third harmonic current content
Fifth harmonic current content
Current content of seventh harmonic
Therefore, the total harmonic content of the current meets 90 percent<K<125 percent, and the content of 2-order harmonic meets K2<1% and the 3 rd harmonic content satisfies K3>70% and satisfies K3>K5>K7>K2And judging that the storage battery car is likely to be charged, starting timing, and entering the step five.
Step five: when the continuous operation time T of the load exceeds a set threshold value, determining that the battery car is charged; otherwise, judging that the battery car is not charged. In step 4, after the storage battery car is judged to be possibly charged, the timing is started, and if the reverse active power change within 5% of the absolute value of the active power change delta P in the step 3 is not detected, the load is considered not to exit, and the timing is continued all the time.
Referring to fig. 2, after the continuous operation time T of the load exceeds 5 minutes, it can be determined that the load change is caused by charging of the battery car, and it is determined that the battery car is charged.
Example 2:
the method and the device can be used for rapidly and accurately identifying the charging of the battery car in a non-invasive manner based on the harmonic content and the time characteristic, have the advantages of simplicity, economy, easiness in popularization and application and the like, and the identification result is favorable for timely finding out the illegal charging of the battery car, can provide a basis for government, community and property to the regulation and treatment of the illegal charging in the battery car house, and can reduce the fire hazard caused by the illegal charging of the battery car.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (12)
1. The non-invasive identification method for charging of the battery car based on the harmonic wave and the time characteristic is characterized by comprising the following steps of: the method comprises the following steps:
the method comprises the following steps: when the incoming line of the main power supply of the user entering the house is started and stopped under the condition that the active power variation delta P is within the threshold range of the charging power of the battery car, entering a second step;
step two: calculating the total harmonic content K of the current, 2, 3, 5 and 7 times of harmonic content KjWhen the content of the total current harmonic and the content of the jth harmonic meet the judgment standard, starting timing to obtain the continuous load operation time T, and entering a third step;
step three: and when the continuous operation time T of the load exceeds a set threshold value, determining that the battery car is charged.
2. The non-intrusive harmonic and temporal characteristic-based battery car charging identification method as defined in claim 1, wherein: in the first step, the charging power threshold range of the electromobile is set to be 90W < delta P < 400W.
3. The non-intrusive harmonic and temporal characteristic-based battery car charging identification method as defined in claim 1, wherein: the judgment standard in the step two is that the total harmonic content of the current meets 90 percent<K<125 percent, and the content of 2-order harmonic meets K2<1% and the 3 rd harmonic content satisfies K3>70% and satisfies K3>K5>K7>K2And judging that the storage battery car can be charged, and starting timing, otherwise, judging that the storage battery car is not charged.
4. The non-intrusive harmonic and temporal characteristic-based battery car charging identification method as defined in claim 1, wherein: the load duration time threshold in step three was set to 5 minutes.
5. The non-intrusive harmonic and temporal characteristic-based battery car charging identification method as defined in claim 1, wherein: the calculation formula of the total harmonic content K of the current is as follows:
wherein, Delta I is the current effective value variable quantity of the incoming line of the main power supply at the user's house-entering sidebaseThe variation of the fundamental wave current value of the incoming line of the main power supply at the user house-entering side is obtained;
2-7 th harmonic content KjThe calculation formula of (2) is as follows:
wherein, Delta IjthdSide total electricity for user's houseThe j harmonic current value variation of the source incoming line.
6. The non-intrusive harmonic and temporal characteristic-based battery car charging identification method as defined in claim 5, wherein: active power variation amount Δ P, current effective value variation amount Δ I, fundamental current value variation amount Δ IbaseCurrent value change Δ I of 2, 3, 5, 7 th harmonicjthdThe method comprises the steps that the sampling frequency is calculated according to a voltage sampling sequence u and a current sampling sequence i, the voltage sampling sequence u and the current sampling sequence i are sampled according to the voltage and the current of a main power supply incoming line of a user house-entering side, and the sampling frequency is not less than 800 Hz.
7. The utility model provides a storage battery car non-invasive identification device that charges based on harmonic and time characteristic which characterized in that: the system comprises the following modules:
a power discrimination module: the harmonic discrimination module is used for entering a harmonic discrimination module when a load starting and stopping of a main power inlet wire of a user house-entering side occurs and the active power variation delta P is within the range of a charging power threshold of the storage battery car;
a harmonic discrimination module: for calculating the total harmonic content K, 2, 3, 5, 7 harmonic content K of currentjWhen the content of the total current harmonic and the content of the jth harmonic meet the judgment standard, starting timing to obtain the continuous load operation time T, and entering an operation time judgment module;
an operating time judging module: and when the continuous operation time T of the load exceeds a set threshold value, determining that the battery car is charged.
8. The non-intrusive identification device for battery car charging based on harmonic and time characteristics as defined in claim 7, wherein: the charging power threshold range of the electromobile is set to be 90W < delta P < 400W.
9. The non-intrusive identification device for battery car charging based on harmonic and time characteristics as defined in claim 7, wherein: the judgment standard in the harmonic judgment module is that the total harmonic content of the current meets 90 percent<K<125%, and 2The subharmonic content satisfies K2<1% and the 3 rd harmonic content satisfies K3>70% and satisfies K3>K5>K7>K2And judging that the storage battery car can be charged, and starting timing, otherwise, judging that the storage battery car is not charged.
10. The non-intrusive identification device for battery car charging based on harmonic and time characteristics as defined in claim 7, wherein: and the load continuous operation time threshold value in the operation time judging module is set to be 5 minutes.
11. The non-intrusive identification device for battery car charging based on harmonic and time characteristics as defined in claim 7, wherein: the calculation formula of the total harmonic content K of the current is as follows:
wherein, Delta I is the current effective value variable quantity of the incoming line of the main power supply at the user's house-entering sidebaseThe variation of the fundamental wave current value of the incoming line of the main power supply at the user house-entering side is obtained;
2-7 th harmonic content KjThe calculation formula of (2) is as follows:
wherein, Delta IjthdAnd j harmonic current value variable quantity of the incoming line of the main power supply at the user entrance side.
12. The non-intrusive identification device for battery car charging based on harmonic and time characteristics as defined in claim 11, wherein: active power variation amount Δ P, current effective value variation amount Δ I, fundamental current value variation amount Δ IbaseCurrent value change Δ I of 2, 3, 5, 7 th harmonicjthdCalculated according to a voltage sampling sequence u and a current sampling sequence i, the voltageAnd the sampling sequence u and the current sampling sequence i are formed according to the voltage and the current of the incoming line of the main power supply of the user home side, and the sampling frequency is not less than 800 Hz.
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