CN117129741B - Method for collecting voltage to ground of bus of direct current system and electronic equipment - Google Patents

Method for collecting voltage to ground of bus of direct current system and electronic equipment Download PDF

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Publication number
CN117129741B
CN117129741B CN202311402701.3A CN202311402701A CN117129741B CN 117129741 B CN117129741 B CN 117129741B CN 202311402701 A CN202311402701 A CN 202311402701A CN 117129741 B CN117129741 B CN 117129741B
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sampling interval
voltage difference
voltage
bus
ground
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CN117129741A (en
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陆志远
翟志国
崔振伟
刘巍
雷轩
杜瑞冰
孙海宁
盖世
王震
崔晓东
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Shijiazhuang Kelin Internet Of Things Technology Co ltd
Shijiazhuang Kelin Electric Co Ltd
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Shijiazhuang Kelin Internet Of Things Technology Co ltd
Shijiazhuang Kelin Electric Co Ltd
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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
    • G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The invention provides a method for collecting the voltage to the ground of a bus of a direct current system and electronic equipment. The method comprises the following steps: setting a first sampling interval, a second sampling interval and a third sampling interval respectively; the first sampling interval is smaller than the second sampling interval, and the first sampling interval is larger than the third sampling interval; respectively calculating a first voltage difference value corresponding to a first sampling interval, a second voltage difference value corresponding to a second sampling interval and a third voltage difference value corresponding to a third sampling interval; when the first voltage difference value, the second voltage difference value and the third voltage difference value meet a preset relation, determining the first sampling interval as an optimal sampling interval; and collecting the bus grounding voltage at different moments according to the optimal sampling interval, and determining the bus grounding voltage in a stable state according to the bus grounding voltage at different moments. The invention can accurately determine the voltage value of the bus to the ground, thereby improving the calculation accuracy of the resistance to the ground.

Description

Method for collecting voltage to ground of bus of direct current system and electronic equipment
Technical Field
The invention relates to the technical field of measuring electric variables, in particular to a method for collecting the voltage to ground of a busbar of a direct current system and electronic equipment.
Background
The intelligent integrated power supply system of the transformer substation is mainly used for monitoring the direct current system of the transformer substation, and provides a guarantee for realizing uninterrupted and stable power supply of alternating current and direct current for the whole station by monitoring and managing the running state information of the direct current system of the transformer substation in real time. And the direct current insulation monitoring, namely, the real-time monitoring of the magnitude of the resistance of the bus to the ground in the direct current system reflects whether the bus in the direct current system is grounded or the situation of electric leakage occurs. Because of the huge transformer substation system, wiring is complicated, and direct-current insulation monitoring becomes an important monitoring content in the intelligent integrated power supply system of the transformer substation.
Normally, the bus grounding resistance is a large value, and once the bus grounding resistance is calculated to be smaller than the threshold value, the grounding phenomenon at a certain position of the bus can be judged, so that an alarm is required to be processed. Therefore, the calculation accuracy of the bus-to-ground resistance directly influences the stable operation of the transformer substation.
A common method of calculating the bus ground resistance is to calculate with an unbalanced bridge switching, i.e. after switching the unbalanced bridge, measure the bus ground voltage (i.e. the voltage difference between the bus and ground) and calculate the bus ground resistance from the bus ground voltage. But in practice there will be not only a resistance but also a parasitic capacitance between the bus bar and ground. When switching an unbalanced bridge, the parasitic capacitance will charge or discharge accordingly. If the bus voltage to ground is directly collected after the unbalanced bridge is switched, and the parasitic capacitance does not reach a stable state, an accurate bus voltage to ground value cannot be collected, so that the bus resistance to ground cannot be accurately calculated, and the monitoring result is affected.
Disclosure of Invention
The embodiment of the invention provides a method for collecting the bus voltage to ground of a direct current system and electronic equipment, which are used for solving the problem that the calculation accuracy of the resistance to ground is low because the value of the bus voltage to ground cannot be accurately determined.
In a first aspect, an embodiment of the present invention provides a method for collecting a voltage to ground of a busbar of a direct current system, including:
setting a first sampling interval, a second sampling interval and a third sampling interval respectively; the first sampling interval is less than the second sampling interval, and the first sampling interval is greater than the third sampling interval;
respectively calculating a first voltage difference value corresponding to the first sampling interval, a second voltage difference value corresponding to the second sampling interval and a third voltage difference value corresponding to the third sampling interval;
when the first voltage difference value, the second voltage difference value and the third voltage difference value meet a preset relation, determining the first sampling interval as an optimal sampling interval;
and collecting the bus grounding voltage at different moments according to the optimal sampling interval, and determining the bus grounding voltage in a stable state according to the bus grounding voltage at different moments.
In one possible implementation, the preset relationship includes: the first voltage difference is greater than the second voltage difference and the first voltage difference is greater than the third voltage difference.
In one possible implementation manner, after the calculating the first voltage difference value corresponding to the first sampling interval, the second voltage difference value corresponding to the second sampling interval, and the third voltage difference value corresponding to the third sampling interval, the method further includes:
and when the first voltage difference value is smaller than or equal to the second voltage difference value, or the first voltage difference value is smaller than or equal to the third voltage difference value, respectively adjusting the first sampling interval, the second sampling interval and the third sampling interval, and according to the adjusted first sampling interval, the adjusted second sampling interval and the adjusted third sampling interval, recalculating the corresponding current first voltage difference value, the current second voltage difference value and the current third voltage difference value until the current first voltage difference value is larger than the current second voltage difference value and the current first voltage difference value is larger than the current third voltage difference value, determining the current first sampling interval as the optimal sampling interval, or determining the current first sampling interval as the optimal sampling interval until the current first sampling interval reaches the maximum sampling interval or the minimum sampling interval.
In one possible implementation, when the second voltage difference is smaller than the first voltage difference and the first voltage difference is smaller than the third voltage difference, or when the first voltage difference is smaller than the third voltage difference and the first voltage difference is equal to the second voltage difference, or when the differences between the first voltage difference, the second voltage difference and the third voltage difference are equal,
adjusting the first sampling interval, the second sampling interval, and the third sampling interval, respectively, includes:
determining the first sampling interval as a new second sampling interval;
determining the third sampling interval as a new first sampling interval;
and on the basis of the third sampling interval, reducing a preset time interval to obtain a new third sampling interval.
In one possible implementation, when the second voltage difference is greater than the first voltage difference and the first voltage difference is greater than the third voltage difference, or when the second voltage difference is greater than the first voltage difference and the first voltage difference is equal to the third voltage difference,
Adjusting the first sampling interval, the second sampling interval, and the third sampling interval, respectively, includes:
determining the first sampling interval as a new third sampling interval;
determining the second sampling interval as a new first sampling interval;
and on the basis of the second sampling interval, adding a preset time interval to obtain a new second sampling interval.
In one possible implementation manner, the calculating the first voltage difference value corresponding to the first sampling interval, the second voltage difference value corresponding to the second sampling interval, and the third voltage difference value corresponding to the third sampling interval respectively includes:
correspondingly calculating differences between the bus grounding voltage values after N first sampling intervals and the bus grounding voltage values after M first sampling intervals, differences between the bus grounding voltage values after N second sampling intervals and the bus grounding voltage values after M second sampling intervals and differences between the bus grounding voltage values after N third sampling intervals and the bus grounding voltage values after M third sampling intervals respectively, and correspondingly determining the differences as first voltage differences, second voltage differences and third voltage differences; n and M are integers greater than 0, and N < M.
In one possible implementation, the first sampling interval and the second sampling interval differ by a preset time interval, and the first sampling interval and the third sampling interval differ by a preset time interval.
In one possible implementation manner, the collecting the bus voltage to ground at different moments according to the optimal sampling interval, and determining the bus voltage to ground at a stable state according to the bus voltage to ground at different moments, includes:
according to the optimal sampling interval, respectively acquiring a first bus grounding voltage after one optimal sampling interval and a second bus grounding voltage after two optimal sampling intervals;
and determining the bus grounding voltage in a stable state according to the first bus grounding voltage, the second bus grounding voltage and the initial bus grounding voltage.
In one possible implementation manner, the determining the bus ground voltage in the stable state according to the first bus ground voltage, the second bus ground voltage and the initial bus ground voltage includes:
according toDetermining the bus voltage to ground in a stable state;
wherein,represents the bus voltage to ground in steady state, < > >Representing the voltage of the first bus to ground, < >>Representing the initial bus voltage to ground, +.>Representing the second bus voltage to ground.
In a second aspect, an embodiment of the present invention provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to the first aspect or any one of the possible implementations of the first aspect when the computer program is executed.
The embodiment of the invention provides a method for collecting the bus voltage to ground of a direct current system and electronic equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of a bus and ground in a dc system according to an embodiment of the present invention;
fig. 2 is a flowchart of an implementation method for collecting a voltage to ground of a busbar of a direct current system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a device for collecting a voltage to ground of a busbar of a direct current system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Fig. 1 shows a schematic circuit diagram between a bus and ground in a dc system. Referring to fig. 1, in calculating the bus-to-ground resistance, an unbalanced bridge circuit is typically provided between the bus and ground. By switching the switch K1 and the switch K2 in the unbalanced bridge circuit respectively,correspondingly measuring the voltage value between the positive bus KM and the ground GND and the voltage value between the negative bus-M and the ground GND, thereby respectively calculating and obtaining the ground resistance R of the positive bus x And the ground resistance R of the negative bus y . But it is considered that there may be a parasitic capacitance C1 between the positive bus and ground. A parasitic capacitance C2 may exist between the negative busbar and ground. When the switches K1 and K2 are operated, parasitic capacitances C1 and C2 are charged and discharged. If the bus voltage to ground is directly measured after the switching operation, the accurate bus voltage to ground cannot be acquired, and further the calculation accuracy of the ground resistance is reduced. If the calculation accuracy of the ground resistance is to be improved, the bus voltage to ground can be collected only after the parasitic capacitance is charged and discharged for a long enough time after the switching operation. However, the method is long in time consumption, cannot respond quickly, and is unfavorable for realizing the purpose of real-time monitoring. Aiming at the problem, the embodiment of the invention provides a bus grounding voltage acquisition method, so that the bus grounding voltage is rapidly and accurately determined, the calculation accuracy of the grounding resistance is improved, and the safe operation of a transformer substation is ensured.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Fig. 2 is a flowchart of an implementation method for collecting a voltage to ground of a busbar of a direct current system according to an embodiment of the present invention, which is described in detail below:
step 201, setting a first sampling interval, a second sampling interval and a third sampling interval respectively. The first sampling interval is smaller than the second sampling interval and the first sampling interval is larger than the third sampling interval.
The sampling intervals are different, and the measured busbar ground voltage is also different, so that the calculation accuracy of the ground resistance is affected. The embodiment of the invention initializes three sampling intervals with different lengths, and continuously updates and adjusts the sampling intervals on the basis of the three sampling intervals, thereby determining the final optimal sampling interval and collecting the bus voltage to ground.
In some embodiments, the first sampling interval and the second sampling interval differ by a preset time interval, and the first sampling interval and the third sampling interval differ by a preset time interval.
In order to avoid missing the optimal sampling interval, the sampling intervals are conveniently and correspondingly adjusted and updated subsequently. The sampling intervals may be spaced apart by a predetermined time interval. Essentially, the preset time interval can be understood as a unit step. That is, increasing the unit step size on the basis of the first sampling interval results in a second sampling interval. And reducing the unit step length on the basis of the first sampling interval to obtain a third sampling interval so as to avoid missing the optimal sampling interval and improve the accuracy of the optimal sampling interval.
Step 202, calculating a first voltage difference corresponding to the first sampling interval, a second voltage difference corresponding to the second sampling interval, and a third voltage difference corresponding to the third sampling interval, respectively.
In some embodiments, step 202 may include:
correspondingly calculating differences between the bus grounding voltage values after N first sampling intervals and the bus grounding voltage values after M first sampling intervals, differences between the bus grounding voltage values after N second sampling intervals and the bus grounding voltage values after M second sampling intervals and differences between the bus grounding voltage values after N third sampling intervals and the bus grounding voltage values after M third sampling intervals respectively, and correspondingly determining the differences as first voltage differences, second voltage differences and third voltage differences; n and M are integers greater than 0, and N < M.
Illustratively, n=1, m=2 may be given. Wherein the first sampling interval is denoted by T1. The second sampling interval is denoted by T2. The third sampling interval is denoted by T3. Namely, the difference between the bus voltage to ground value at the time T1 and the bus voltage to ground value at the time 2T1 is calculated and determined as a first voltage difference VT1; calculating a difference value between the bus voltage to ground value at the moment T2 and the bus voltage to ground value at the moment 2T2, and determining the difference value as a second voltage difference value VT2; and calculating the difference between the bus voltage to ground value at the moment T3 and the bus voltage to ground value at the moment 2T3, and determining the difference as a third voltage difference VT3.
In step 203, when the first voltage difference, the second voltage difference and the third voltage difference satisfy the preset relationship, the first sampling interval is determined as the optimal sampling interval.
The charge-discharge equation of the capacitor can be expressed as:；
wherein,representation->Capacitor voltage at time, ">Representing the initial capacitance voltage, ">Representing the capacitance voltage in steady state, +.>Represents the resistance value +.>Representing the capacitance value.
From the above, it can be calculatedCapacitance voltage and->The voltage difference between the capacitor voltages at the moment is: />. Wherein (1)>Representing the voltage difference.
The calculated voltage difference value is derived, and the following steps are obtained:. Wherein (1)>Representing the derivative of the voltage difference.
When (when)When (I)>Maximum. At this time, a->Further solving to obtain the capacitance value of +.>。
From the above, the voltage differenceAt maximum, the more accurate the calculated capacitance value is, correspondingly, the voltage difference +.>At maximum, the more accurate the bus voltage to ground value. And voltage difference->Related to the sampling interval. Therefore, in the embodiment of the invention, the sampling interval at which the maximum voltage difference can be obtained is the optimal sampling interval.
Therefore, the embodiment of the invention calculates the first voltage difference value, the second voltage difference value and the third voltage difference value respectively, and determines the optimal sampling interval according to the magnitude relation among the three voltage difference values.
In some embodiments, the preset relationship comprises: the first voltage difference is greater than the second voltage difference, and the first voltage difference is greater than the third voltage difference.
As described above, the sampling interval corresponding to the maximum voltage difference is the optimal sampling interval. Thus, when the first voltage difference is greater than the second voltage difference and the first voltage difference is greater than the third voltage difference, the first sampling interval is determined to be the optimal sampling interval.
In some embodiments, after step 202, further comprising:
when the first voltage difference is smaller than or equal to the second voltage difference, or the first voltage difference is smaller than or equal to the third voltage difference, respectively adjusting the first sampling interval, the second sampling interval and the third sampling interval, and according to the adjusted first sampling interval, the adjusted second sampling interval and the adjusted third sampling interval, recalculating the corresponding current first voltage difference, the current second voltage difference and the current third voltage difference until the current first voltage difference is larger than the current second voltage difference and the current first voltage difference is larger than the current third voltage difference, determining the current first sampling interval as an optimal sampling interval, or determining the current first sampling interval as an optimal sampling interval until the current first sampling interval reaches the maximum sampling interval or the minimum sampling interval.
That is, if the first voltage difference, the second voltage difference, and the third voltage difference do not satisfy the preset relationship, it is necessary to circularly adjust each sampling interval and correspondingly calculate the voltage difference corresponding to each adjusted sampling interval until the preset relationship is satisfied, or when the maximum sampling interval or the minimum sampling interval is reached, the optimal sampling interval is determined.
In some embodiments, when the second voltage difference is less than the first voltage difference and the first voltage difference is less than the third voltage difference, or when the first voltage difference is less than the third voltage difference and the first voltage difference is equal to the second voltage difference, or when the differences between the first voltage difference, the second voltage difference and the third voltage difference are equal,
adjusting the first sampling interval, the second sampling interval, and the third sampling interval, respectively, includes:
determining the first sampling interval as a new second sampling interval;
determining the third sampling interval as a new first sampling interval;
and on the basis of the third sampling interval, reducing the preset time interval to obtain a new third sampling interval.
As can be seen from the above formula for deriving the voltage difference,is composed of- >And (5) determining. But->Can be simplified as +.>。
As a result of the fact that,and->. Then->。
Thereby the processing time of the product is reduced,is determined by the positive and negative of->Positive and negative of (a). At the same time (I)>At the time, the voltage difference>Monotonically increasing, ->At the time, the voltage difference>Monotonically decreasing.
That is to say that the first and second,and determines the change trend of the voltage difference. I.e. by comparison ofAnd 1 to determine the change trend of the voltage difference value. It can be converted into a comparison +.>And 0. Essentially is +.>And->Magnitude relation between the two.
When (when)When (I)>At this time, the->，/>Take the maximum value.
When (when)When (I)>，/>Monotonically increasing.
When (when)When (I)>，/>Monotonically decreasing.
To sum up, inWithin an interval, with sampling intervaltIncrease of->Monotonically increasing; at the position ofWithin the interval, < > as the sampling interval t increases>Monotonically decreasing.
When the second voltage difference is smaller than the first voltage difference and the first voltage difference is smaller than the third voltage difference, or when the first voltage difference is smaller than the third voltage difference and the first voltage difference is equal to the second voltage difference, i.e., VT2 < VT1 < VT3, or VT 2=v1 < VT3. Illustrating the tendency of the voltage difference to decrease gradually as the sampling interval increases. At this time, the sampling interval is further reduced, so as to find the sampling interval corresponding to the maximum voltage difference.
Thus, in the embodiment of the invention, the current first sampling interval is determined as a new second sampling interval; determining a current third sampling interval as a new first sampling interval; and reducing the preset time interval on the basis of the current third sampling interval to obtain a new third sampling interval. The current third sampling interval, the current first sampling interval and the current second sampling interval differ by a preset time interval in turn so far, and therefore, in essence, the current first sampling interval, the current second sampling interval and the current third sampling interval are correspondingly reduced by the preset time interval, so that a new first sampling interval, a new second sampling interval and a new third sampling interval are correspondingly obtained.
When the voltage difference is in a gradual decreasing trend, the sampling interval needs to be continuously reduced and a new voltage difference is recalculated until a situation occurs in which the first voltage difference is greater than the second voltage difference and the first voltage difference is greater than the third voltage difference, i.e., VT1 > VT2 and VT1 > VT3. At this time, the first voltage difference is the largest, and accordingly, the first sampling interval corresponding to the first voltage difference is the optimal sampling interval.
When the first voltage difference value, the second voltage difference value, and the third voltage difference value are equal, i.e., v1=v2=v3. At this point, the capacitor voltage has already tended to stabilize. This means that the first, second and third sampling intervals are too large, and the sampling interval can be further reduced to determine the optimal sampling interval.
It should be noted that, considering the charge-discharge characteristics of the capacitor, when the difference between the first voltage difference and the second voltage difference is smaller than the preset difference, it is determined that the first voltage difference and the second voltage difference are equal. Similarly, when the difference between the first voltage difference and the second voltage difference is smaller than the preset difference and the difference between the first voltage difference and the third voltage difference is smaller than the preset difference, the first voltage difference, the second voltage difference and the third voltage difference are equal.
In order to avoid the situation that the sampling interval is continuously reduced due to the fact that the calculation accuracy is pursued excessively, the embodiment of the invention sets the minimum sampling interval. If the current first sampling interval reaches the minimum sampling interval, the current first sampling interval is directly determined to be the optimal sampling interval.
In some embodiments, when the second voltage difference is greater than the first voltage difference and the first voltage difference is greater than the third voltage difference, or when the second voltage difference is greater than the first voltage difference and the first voltage difference is equal to the third voltage difference,
Adjusting the first sampling interval, the second sampling interval, and the third sampling interval, respectively, includes:
determining the first sampling interval as a new third sampling interval;
determining the second sampling interval as a new first sampling interval;
and on the basis of the second sampling interval, adding a preset time interval to obtain a new second sampling interval.
When the second voltage difference is greater than the first voltage difference and the first voltage difference is greater than the third voltage difference, or when the second voltage difference is greater than the first voltage difference and the first voltage difference is equal to the third voltage difference, i.e., VT2 > VT1 > VT3, or VT2 > VT 1=vt 3. It is explained that the voltage difference gradually increases with increasing sampling interval. At this time, the sampling interval is further increased, so as to find the sampling interval corresponding to the maximum voltage difference.
When the sampling interval is increased, the embodiment of the invention determines the current first sampling interval as a new third sampling interval; determining the current second sampling interval as a new first sampling interval; and adding a preset time interval on the basis of the current second sampling interval to obtain a new second sampling interval. That is, the current first sampling interval, the current second sampling interval, and the current third sampling interval are correspondingly increased by a preset time interval, so that a new first sampling interval, a new second sampling interval, and a new third sampling interval are correspondingly obtained.
And similarly, if the difference between the first voltage difference and the third voltage difference is smaller than the preset difference, judging that the first voltage difference is equal to the third voltage difference.
In order to avoid the situation that the sampling interval is continuously increased due to the fact that the calculation accuracy is too pursued, the embodiment of the invention sets the maximum sampling interval. If the current first sampling interval reaches the maximum sampling interval, the current first sampling interval is directly determined to be the optimal sampling interval.
It should be noted that, for a relatively fixed substation dc system, the above method may be used to determine the optimal sampling interval. And the bus voltage to ground is collected in real time based on the optimal sampling interval, so that the purpose of real-time monitoring is realized. If the wiring in the direct current system of the transformer substation changes, the parasitic capacitance also changes correspondingly, and at the moment, the optimal sampling interval needs to be determined again.
And 204, collecting the bus grounding voltage at different moments according to the optimal sampling interval, and determining the bus grounding voltage in a stable state according to the bus grounding voltage at different moments.
As described above, the more accurate the calculated bus voltage to ground value is when the voltage difference is maximum. Therefore, the bus grounding voltage at different moments can be acquired according to the optimal sampling interval, and then the bus grounding voltage in a stable state can be calculated according to the bus grounding voltage at different moments.
In some embodiments, step 204 may include:
according to the optimal sampling interval, respectively acquiring a first bus grounding voltage after one optimal sampling interval and a second bus grounding voltage after two optimal sampling intervals;
and determining the bus grounding voltage in the stable state according to the first bus grounding voltage, the second bus grounding voltage and the initial bus grounding voltage.
In some embodiments, it may be according toDetermining the bus voltage to ground in a stable state;
wherein,represents the bus voltage to ground in steady state, < >>Representing the first bus voltage to ground, +.>Representing the initial bus voltage to ground, < >>Representing the second bus voltage to ground.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
through setting a first sampling interval, a second sampling interval and a third sampling interval, correspondingly calculating a first voltage difference value, a second voltage difference value and a third voltage difference value, when the first voltage difference value, the second voltage difference value and the third voltage difference value meet a preset relation, determining the current first sampling interval as an optimal sampling interval, determining the bus grounding voltage under a stable state according to the optimal sampling interval, and improving the accuracy of the bus grounding voltage, further improving the calculation precision of the grounding resistance and guaranteeing the safe operation of a transformer substation system. Meanwhile, the embodiment of the invention sets the maximum sampling interval and the minimum sampling interval so as to avoid the situation that the calculation precision is excessively pursued and the optimal sampling interval cannot be quickly determined, thereby realizing quick and accurate determination of the bus voltage to ground.
Further, the embodiment of the invention determines the sampling interval corresponding to the maximum voltage difference as the optimal sampling interval based on the capacitor charge-discharge characteristic, circularly adjusts the first sampling interval, the second sampling interval and the third sampling interval based on the optimal sampling interval, correspondingly calculates the first voltage difference, the second voltage difference and the third voltage difference until the first voltage difference is larger than the second voltage difference and the first voltage difference is larger than the third voltage difference, and determines the first sampling interval corresponding to the first voltage difference as the optimal sampling interval to improve the accuracy of the optimal sampling interval, thereby improving the accuracy of the bus to the ground voltage.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The following are device embodiments of the invention, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
Fig. 3 is a schematic structural diagram of a device for collecting a voltage to ground of a busbar of a direct current system according to an embodiment of the present invention, and for convenience of explanation, only the relevant parts of the embodiment of the present invention are shown, and the details are as follows:
As shown in fig. 3, the bus voltage to ground acquisition device 3 includes: a setting module 31, an adjusting module 32 and a determining module 33.
A setting module 31 for setting a first sampling interval, a second sampling interval, and a third sampling interval, respectively; the first sampling interval is smaller than the second sampling interval, and the first sampling interval is larger than the third sampling interval;
the adjusting module 32 is configured to calculate a first voltage difference corresponding to the first sampling interval, a second voltage difference corresponding to the second sampling interval, and a third voltage difference corresponding to the third sampling interval, respectively;
the adjustment module 32 is further configured to determine the first sampling interval as an optimal sampling interval when the first voltage difference, the second voltage difference, and the third voltage difference satisfy a preset relationship;
the determining module 33 is configured to collect the bus voltage to ground at different times according to the optimal sampling interval, and determine the bus voltage to ground in a stable state according to the bus voltage to ground at different times.
In one possible implementation, the preset relationship includes: the first voltage difference is greater than the second voltage difference, and the first voltage difference is greater than the third voltage difference.
In a possible implementation manner, the adjustment module 32 is further configured to adjust the first sampling interval, the second sampling interval, and the third sampling interval when the first voltage difference is less than or equal to the second voltage difference, or the first voltage difference is less than or equal to the third voltage difference, and recalculate the corresponding current first voltage difference, the current second voltage difference, and the current third voltage difference according to the adjusted first sampling interval, the adjusted second sampling interval, and the adjusted third sampling interval, until the current first voltage difference is greater than the current second voltage difference, and the current first voltage difference is greater than the current third voltage difference, and determine the current first sampling interval as the optimal sampling interval, or determine the current first sampling interval as the optimal sampling interval until the current first sampling interval reaches the maximum sampling interval or the minimum sampling interval.
In one possible implementation, when the second voltage difference is less than the first voltage difference and the first voltage difference is less than the third voltage difference, or when the first voltage difference is less than the third voltage difference and the first voltage difference is equal to the second voltage difference, or when the first voltage difference, the second voltage difference and the third voltage difference are equal,
an adjustment module 32 for determining the first sampling interval as a new second sampling interval;
the adjustment module 32 is further configured to determine the third sampling interval as a new first sampling interval;
the adjusting module 32 is further configured to reduce the preset time interval based on the third sampling interval, so as to obtain a new third sampling interval.
In one possible implementation, when the second voltage difference is greater than the first voltage difference and the first voltage difference is greater than the third voltage difference, or when the second voltage difference is greater than the first voltage difference and the first voltage difference is equal to the third voltage difference,
an adjustment module 32 for determining the first sampling interval as a new third sampling interval;
the adjustment module 32 is further configured to determine the second sampling interval as a new first sampling interval;
The adjusting module 32 is further configured to increase the preset time interval based on the second sampling interval, so as to obtain a new second sampling interval.
In one possible implementation manner, the adjustment module 32 is configured to correspondingly calculate a difference between the bus-to-ground voltage value after N first sampling intervals and the bus-to-ground voltage value after M first sampling intervals, a difference between the bus-to-ground voltage value after N second sampling intervals and the bus-to-ground voltage value after M second sampling intervals, and a difference between the bus-to-ground voltage value after N third sampling intervals and the bus-to-ground voltage value after M third sampling intervals, and correspondingly determine the differences as a first voltage difference, a second voltage difference, and a third voltage difference; n and M are integers greater than 0, and N < M.
In one possible implementation, the first sampling interval and the second sampling interval differ by a preset time interval, and the first sampling interval and the third sampling interval differ by a preset time interval.
In a possible implementation manner, the determining module 33 is configured to collect, according to the optimal sampling intervals, the first bus voltage to ground after undergoing one optimal sampling interval and the second bus voltage to ground after undergoing two optimal sampling intervals, respectively;
The determining module 33 is further configured to determine the bus ground voltage in the steady state according to the first bus ground voltage, the second bus ground voltage, and the initial bus ground voltage.
In a possible implementation, the determining module 33 is configured to determine, according to the followingDetermining the bus voltage to ground in a stable state;
wherein,represents the bus voltage to ground in steady state, < >>Representing the first bus voltage to ground, +.>Representing the initial bus voltage to ground, < >>Representing the second bus voltage to ground.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the setting module 31 correspondingly calculates the first voltage difference value, the second voltage difference value and the third voltage difference value by setting the first sampling interval, the second sampling interval and the third sampling interval, and the adjusting module 32 determines the current first sampling interval as the optimal sampling interval when the first voltage difference value, the second voltage difference value and the third voltage difference value meet the preset relationship, and the adjusting module 33 determines the bus grounding voltage in the stable state according to the optimal sampling interval, so that the accuracy of the bus grounding voltage can be improved, the calculation precision of the grounding resistance is further improved, and the safe operation of the transformer substation system is ensured. Meanwhile, the adjustment module 32 sets the maximum sampling interval and the minimum sampling interval to avoid the situation that the calculation accuracy is excessively pursued and the optimal sampling interval cannot be quickly determined, so that the bus voltage to ground is quickly and accurately determined.
Further, the embodiment of the invention determines the sampling interval corresponding to the maximum voltage difference as the optimal sampling interval based on the capacitor charge-discharge characteristic, and based on the optimal sampling interval, the adjusting module 32 circularly adjusts the first sampling interval, the second sampling interval and the third sampling interval, and correspondingly calculates the first voltage difference, the second voltage difference and the third voltage difference until the first voltage difference is larger than the second voltage difference and the first voltage difference is larger than the third voltage difference, and determines the first sampling interval corresponding to the first voltage difference as the optimal sampling interval to improve the accuracy of the optimal sampling interval, thereby improving the accuracy of the bus to the ground voltage.
Fig. 4 is a schematic diagram of an electronic device according to an embodiment of the present invention. As shown in fig. 4, the electronic apparatus 4 of this embodiment includes: a processor 40, a memory 41 and a computer program 42 stored in the memory 41 and executable on the processor 40. The processor 40 executes the computer program 42 to implement the steps of the above-described embodiments of the method for collecting the voltage to ground of the dc system bus, for example, steps 201 to 204 shown in fig. 2. Alternatively, the processor 40, when executing the computer program 42, performs the functions of the modules/units of the apparatus embodiments described above, such as the functions of the modules 31 to 33 shown in fig. 3.
Illustratively, the computer program 42 may be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing the specified functions, which instruction segments are used to describe the execution of the computer program 42 in the electronic device 4. For example, the computer program 42 may be divided into modules 31 to 33 shown in fig. 3.
The electronic device 4 may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The electronic device 4 may include, but is not limited to, a processor 40, a memory 41. It will be appreciated by those skilled in the art that fig. 4 is merely an example of the electronic device 4 and is not meant to be limiting of the electronic device 4, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the electronic device may further include an input-output device, a network access device, a bus, etc.
The processor 40 may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the electronic device 4, such as a hard disk or a memory of the electronic device 4. The memory 41 may be an external storage device of the electronic device 4, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the electronic device 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the electronic device 4. The memory 41 is used for storing the computer program and other programs and data required by the electronic device. The memory 41 may also be used for temporarily storing data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/electronic device and method may be implemented in other manners. For example, the apparatus/electronic device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the above-described embodiment of the method, or may be implemented by instructing related hardware through a computer program, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of each of the above-described embodiments of the method for collecting a dc system bus voltage to ground when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; 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, and are intended to be included in the scope of the present invention.

Claims (8)

1. The acquisition method of the direct current system bus voltage to the ground is characterized by comprising the following steps of:
setting a first sampling interval, a second sampling interval and a third sampling interval respectively; the first sampling interval is less than the second sampling interval, and the first sampling interval is greater than the third sampling interval;
respectively calculating a first voltage difference value corresponding to the first sampling interval, a second voltage difference value corresponding to the second sampling interval and a third voltage difference value corresponding to the third sampling interval;
when the first voltage difference value, the second voltage difference value and the third voltage difference value meet a preset relation, determining the first sampling interval as an optimal sampling interval; the preset relation comprises the following steps: the first voltage difference is greater than the second voltage difference, and the first voltage difference is greater than the third voltage difference;
collecting bus grounding voltages at different moments according to the optimal sampling interval, and determining the bus grounding voltages in a stable state according to the bus grounding voltages at different moments;
wherein the calculating the first voltage difference corresponding to the first sampling interval, the second voltage difference corresponding to the second sampling interval, and the third voltage difference corresponding to the third sampling interval respectively includes:
Correspondingly calculating differences between the bus grounding voltage values after N first sampling intervals and the bus grounding voltage values after M first sampling intervals, differences between the bus grounding voltage values after N second sampling intervals and the bus grounding voltage values after M second sampling intervals and differences between the bus grounding voltage values after N third sampling intervals and the bus grounding voltage values after M third sampling intervals respectively, and correspondingly determining the differences as first voltage differences, second voltage differences and third voltage differences; n and M are integers greater than 0, and N < M.
2. The method for collecting a voltage to ground of a dc system bus according to claim 1, further comprising, after the calculating the first voltage difference corresponding to the first sampling interval, the second voltage difference corresponding to the second sampling interval, and the third voltage difference corresponding to the third sampling interval, respectively:
and when the first voltage difference value is smaller than or equal to the second voltage difference value, or the first voltage difference value is smaller than or equal to the third voltage difference value, respectively adjusting the first sampling interval, the second sampling interval and the third sampling interval, and according to the adjusted first sampling interval, the adjusted second sampling interval and the adjusted third sampling interval, recalculating the corresponding current first voltage difference value, the current second voltage difference value and the current third voltage difference value until the current first voltage difference value is larger than the current second voltage difference value and the current first voltage difference value is larger than the current third voltage difference value, determining the current first sampling interval as the optimal sampling interval, or determining the current first sampling interval as the optimal sampling interval until the current first sampling interval reaches the maximum sampling interval or the minimum sampling interval.
3. The method for collecting the voltage to the ground of the bus of the direct current system according to claim 2, wherein when the second voltage difference is smaller than the first voltage difference and the first voltage difference is smaller than the third voltage difference, or when the first voltage difference is smaller than the third voltage difference and the first voltage difference is equal to the second voltage difference, or when the first voltage difference, the second voltage difference and the third voltage difference are equal,
adjusting the first sampling interval, the second sampling interval, and the third sampling interval, respectively, includes:
determining the first sampling interval as a new second sampling interval;
determining the third sampling interval as a new first sampling interval;
and on the basis of the third sampling interval, reducing a preset time interval to obtain a new third sampling interval.
4. The method for collecting the voltage to ground of the bus of the direct current system according to claim 2, wherein when the second voltage difference is greater than the first voltage difference and the first voltage difference is greater than the third voltage difference, or when the second voltage difference is greater than the first voltage difference and the first voltage difference is equal to the third voltage difference,
Adjusting the first sampling interval, the second sampling interval, and the third sampling interval, respectively, includes:
determining the first sampling interval as a new third sampling interval;
determining the second sampling interval as a new first sampling interval;
and on the basis of the second sampling interval, adding a preset time interval to obtain a new second sampling interval.
5. The method for collecting a dc system bus voltage to ground according to any one of claims 1 to 4, wherein the first sampling interval and the second sampling interval differ by a predetermined time interval, and the first sampling interval and the third sampling interval differ by a predetermined time interval.
6. The method for collecting voltages to ground of a dc system according to any one of claims 1 to 4, wherein collecting voltages to ground of the bus at different times according to the optimal sampling interval, and determining voltages to ground of the bus in a steady state according to voltages to ground of the bus at different times, comprises:
according to the optimal sampling interval, respectively acquiring a first bus grounding voltage after one optimal sampling interval and a second bus grounding voltage after two optimal sampling intervals;
And determining the bus grounding voltage in a stable state according to the first bus grounding voltage, the second bus grounding voltage and the initial bus grounding voltage.
7. The method for collecting the bus voltage to ground of the direct current system according to claim 6, wherein determining the bus voltage to ground in a stable state according to the first bus voltage to ground, the second bus voltage to ground and the initial bus voltage to ground comprises:
according toDetermining the bus voltage to ground in a stable state;
wherein,represents the bus voltage to ground in steady state, < >>Representing the voltage of the first bus to ground, < >>Representing the initial bus voltage to ground, +.>Representing the second bus voltage to ground.
8. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, carries out the steps of a method for collecting a dc system bus voltage to ground according to any of the preceding claims 1 to 7.
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