CN117148256A - Method, device, equipment and storage medium for checking load of transformer substation - Google Patents
Method, device, equipment and storage medium for checking load of transformer substation Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
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Abstract
The invention discloses a method, a device, equipment and a storage medium for checking load of a transformer substation, wherein the method comprises the following steps: acquiring sampling data of a transformer substation when the transformer substation is loaded, detecting the amplitude of the three-phase voltage, and detecting the phase sequence of the phase angle of the three-phase voltage; when the three-phase voltage amplitude values are similar and the three-phase voltage phase angle is a positive phase sequence, the amplitude value of the three-phase current is detected, and the phase sequence of the three-phase current phase angle is detected. When the three-phase current amplitude is similar and the three-phase current phase angle is the positive phase sequence, calculating the included angle between the single-phase voltage and the single-phase current to obtain the power factor angle. And detecting whether the power factor angle is consistent with the system load characteristic, and if so, detecting the difference flow amplitude after load. If the differential flow amplitude is smaller than the differential flow threshold, the verification is judged to be passed. The voltage, current and polarity of the transformer substation are automatically checked, the efficiency of on-load checking of the transformer substation is improved, and circuit faults and personnel electric shock can be avoided.
Description
Technical Field
The application relates to the technical field of power grid device verification, in particular to a method, a device, equipment and a storage medium for verifying the load of a transformer substation.
Background
When a new device is put into operation or a secondary current loop is changed in a transformer substation of the power grid, carrying out load verification, wherein the current load verification depends on manual operation of a verifier on site with a test instrument, and the voltage amplitude, the voltage phase angle, the current amplitude, the current phase angle and the polarity are verified to obtain a load verification result, and the load verification result is judged manually.
The load verification efficiency of the transformer substation is low by manual work, and the load verification result can be misjudged by manual work. Incorrect operation steps of the check personnel easily lead to lower accuracy of check results, and during on-load check, incorrect manual operation can cause circuit faults and personnel electric shock.
Disclosure of Invention
The application aims at: the method, the device, the equipment and the storage medium for checking the load of the transformer substation are provided to solve the problems that the load test efficiency of the existing transformer substation is low, the load test result can be misjudged manually, and circuit faults and personnel electric shock can be caused by improper manual operation.
In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a method for checking load of a transformer substation, including:
acquiring sampling data of a transformer substation when the transformer substation is loaded, wherein the sampling data comprises three-phase voltage amplitude values, three-phase voltage phase angles, three-phase current amplitude values and three-phase current phase angles;
detecting the amplitude of the three-phase voltage and detecting the phase sequence of the phase angle of the three-phase voltage; when the three-phase voltage amplitude values are similar and the three-phase voltage phase angle is a positive phase sequence, detecting the amplitude value of the three-phase current amplitude value, and detecting the phase sequence of the three-phase current phase angle;
when the three-phase current amplitude values are similar and the three-phase current phase angle is a positive phase sequence, calculating an included angle between the single-phase voltage and the single-phase current to obtain a power factor angle;
detecting whether the power factor angle is consistent with the system load characteristics, if so, detecting the difference flow amplitude value after load;
and if the difference flow amplitude is smaller than the difference flow threshold value, judging that the verification is passed.
Preferably, the detecting the amplitude of the three-phase voltage includes:
calculating the difference between the amplitude of the A-phase voltage and the amplitude of the B-phase voltage to obtain a first voltage difference;
Calculating the difference between the amplitude of the A-phase voltage and the amplitude of the C-phase voltage to obtain a second voltage difference;
calculating the difference between the B-phase voltage amplitude and the C-phase voltage amplitude to obtain a third voltage difference;
and detecting whether the first voltage difference value, the second voltage difference value and the third voltage difference value are smaller than a first voltage difference threshold value, and if yes, the three-phase voltage amplitude values are similar.
Preferably, the detecting the phase sequence of the three-phase voltage phase angle includes:
detecting whether the phase angle of the B-phase voltage lags behind a first angle threshold of the phase angle of the A-phase voltage;
detecting whether a C-phase voltage phase angle lags the B-phase voltage phase angle by the first angle threshold;
and if the B-phase voltage phase angle lags the A-phase voltage phase angle by the first angle threshold value and the C-phase voltage phase angle lags the B-phase voltage phase angle by the first angle threshold value, the three-phase voltage phase angle is a positive phase sequence.
Preferably, the detecting the amplitude of the three-phase current includes:
calculating the difference between the amplitude of the phase A current and the amplitude of the phase B current to obtain a first current difference value;
calculating the difference between the A-phase current amplitude and the C-phase current amplitude to obtain a second current difference;
calculating the difference between the B-phase current amplitude and the C-phase current amplitude to obtain a third current difference;
And detecting whether the first current difference value, the second current difference value and the third current difference value are smaller than a first current difference threshold value, and if yes, the three-phase current amplitude values are similar.
Preferably, the detecting the phase sequence of the three-phase current phase angle includes:
detecting whether the phase angle of the B-phase current lags behind a second angle threshold of the phase angle of the A-phase current;
detecting whether a phase angle of the C-phase current lags behind the phase angle of the B-phase current by the second angle threshold;
and if the B-phase current phase angle lags the A-phase current phase angle by the second angle threshold value and the C-phase current phase angle lags the B-phase current phase angle by the second angle threshold value, the three-phase current phase angle is a positive phase sequence.
Preferably, the detecting whether the power factor angle is consistent with a system load characteristic includes:
acquiring system load characteristics acquired by a dispatching automation system, wherein the system load characteristics comprise active power and reactive power;
calculating apparent power according to the active power and the reactive power, and calculating the ratio of the active power to the apparent power to obtain a system power factor;
and calculating a trigonometric function of the power factor angle to obtain a measured power factor, and if the measured power factor is equal to the system power factor, the power factor angle is consistent with the system load characteristic.
Preferably, the detecting the difference flow amplitude after load comprises:
detecting a differential flow amplitude of a line protection differential flow and a bus protection differential flow;
or detecting the difference flow amplitude of the large difference flow and the small difference flow of bus protection.
In a second aspect, an embodiment of the present invention provides a device for checking load of a substation, including:
the sampling data acquisition module is used for acquiring sampling data of the transformer substation when the transformer substation is loaded, wherein the sampling data comprises three-phase voltage amplitude values, three-phase voltage phase angles, three-phase current amplitude values and three-phase current phase angles;
the amplitude and phase angle detection module is used for detecting the amplitude of the three-phase voltage and detecting the phase sequence of the phase angle of the three-phase voltage; when the three-phase voltage amplitude values are similar and the three-phase voltage phase angle is a positive phase sequence, detecting the amplitude value of the three-phase current amplitude value, and detecting the phase sequence of the three-phase current phase angle;
the voltage and current included angle calculation module is used for calculating the included angle between the single-phase voltage and the single-phase current to obtain a power factor angle when the three-phase current amplitude is similar and the three-phase current phase angle is a positive phase sequence;
the differential flow amplitude detection module is used for detecting whether the power factor angle is consistent with the system load characteristics, and if so, detecting the differential flow amplitude after load;
And the verification judging module is used for judging that verification is passed if the differential flow amplitude is smaller than the differential flow threshold value.
In a third aspect, an embodiment of the present invention provides an electronic device, including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method for checking load on a substation according to any of the embodiments of the present invention.
In a fourth aspect, an embodiment of the present invention provides a computer readable storage medium, where a computer instruction is stored, where the computer instruction is configured to cause a processor to execute a method for checking load on a substation according to any one embodiment of the present invention.
The method for verifying the transformer substation on load comprises the steps of obtaining sampling data of the transformer substation on load, wherein the sampling data comprise three-phase voltage amplitude values, three-phase voltage phase angles, three-phase current amplitude values and three-phase current phase angles. And detecting the amplitude of the three-phase voltage and detecting the phase sequence of the phase angle of the three-phase voltage. When the amplitudes of the three-phase voltages are similar and the phase angles of the three-phase voltages are positive phase sequences, the amplitudes and the phase angles of the three-phase voltages are verified. And detecting the amplitude of the three-phase current and detecting the phase sequence of the phase angle of the three-phase current. When the three-phase current amplitude is similar and the three-phase current phase angle is a positive phase sequence, the three-phase current amplitude and the three-phase current phase angle are verified, the three-phase voltage and the three-phase current are verified, the three-phase alternating current power supply efficiency is high, and the power supply safety is good. And calculating an included angle between the single-phase voltage and the single-phase current to obtain a power factor angle. Comparing the calculated power factor angle with the detected system load characteristic, and when the power factor angle is consistent with the system load characteristic, indicating that the polarity of the protection device is correct after the protection device is put into operation. And detecting the difference flow amplitude after load, and judging that the verification is passed when the difference flow amplitude is smaller than the difference flow threshold. According to the method, the voltage, the current and the polarity of the transformer substation are automatically checked according to the three-phase voltage amplitude, the three-phase voltage phase angle, the three-phase current amplitude, the three-phase current phase angle, the power factor angle and the differential current amplitude, the efficiency of load check of the transformer substation is improved, and the verification according to a preset rule has higher accuracy. In addition, because manual field verification is not needed, circuit faults and personnel electric shock caused by improper manual operation can be avoided.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for checking load of a transformer substation according to a first embodiment of the present invention;
fig. 2 is a flowchart of a method for checking load of a transformer substation according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a transformer substation load verification device according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device for implementing the method for checking load of a transformer substation according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a flowchart of a method for checking load of a transformer substation according to a first embodiment of the present invention, where the embodiment is applicable to a case where load checking is performed on a transformer substation when a new device of the transformer substation of a power grid is put into operation or a secondary current loop is changed, the method may be performed by a device for checking load of the transformer substation, and the device may be implemented in a form of hardware and/or software, and the device for checking load of the transformer substation may be configured in a platform for checking load of the transformer substation. As shown in fig. 1, the method for verifying the load of the transformer substation comprises the following steps S10-S14:
S10: and acquiring sampling data of the transformer substation when the transformer substation is loaded, wherein the sampling data comprises three-phase voltage amplitude values, three-phase voltage phase angles, three-phase current amplitude values and three-phase current phase angles.
The secondary operation and maintenance control platform is arranged at the main station end, and when a new device of the transformer substation is put into operation or a secondary current loop is changed, the secondary operation and maintenance control platform at the main station end acquires sampling data of a protection device of the transformer substation through a dispatching data network.
The three-phase voltage amplitude includes an a-phase voltage amplitude, a B-phase voltage amplitude, and a C-phase voltage amplitude, and the three-phase voltage phase angle includes an a-phase voltage phase angle, a B-phase voltage phase angle, and a C-phase voltage phase angle. The three-phase current amplitude includes an A-phase current amplitude, a B-phase current amplitude, and a C-phase current amplitude, and the three-phase current phase angle includes an A-phase current phase angle, a B-phase current phase angle, and a C-phase current phase angle.
S11: detecting the amplitude of the three-phase voltage and detecting the phase sequence of the phase angle of the three-phase voltage; and when the three-phase voltage amplitude values are similar and the three-phase voltage phase angle is a positive phase sequence, detecting the amplitude value of the three-phase current amplitude value and detecting the phase sequence of the three-phase current phase angle.
The voltage amplitude in the three-phase circuit refers to the distance from the peak value to the zero point of the voltage waveform, and the voltage amplitude of each phase is a fixed value. The three-phase voltage phase angle is a positive phase sequence, i.e. the B-phase voltage phase angle lags the A-phase voltage phase angle, and the C-phase voltage phase angle lags the B-phase voltage phase angle.
By way of example, the A-phase voltage magnitude, the B-phase voltage magnitude, and the C-phase voltage magnitude are all 60V, the A-phase voltage phase angle is 0 degrees, the B-phase voltage phase angle is-120 degrees, and the C-phase voltage phase angle is 120 degrees.
S12: and when the three-phase current amplitude values are similar and the three-phase current phase angle is a positive phase sequence, calculating an included angle between the single-phase voltage and the single-phase current to obtain a power factor angle.
The magnitude of the three-phase current amplitude is related to the power magnitude and the property of the load, and the three-phase current amplitude is equal under the condition of balancing the load. Under unbalanced load conditions, the three-phase currents are not equal in magnitude, which can lead to instability and damage of the power system.
The three-phase current phase angle is a positive phase sequence, namely the B-phase current phase angle lags the A-phase current phase angle, and the C-phase current phase angle lags the B-phase current phase angle.
By way of example, the A-phase, B-phase and C-phase current magnitudes are all 0.12A, the A-phase current phase angle is-30 degrees, the B-phase current phase angle is-150 degrees, and the C-phase current phase angle is 90 degrees.
S13: and detecting whether the power factor angle is consistent with the system load characteristic, and if so, detecting the difference flow amplitude value after load.
The power factor angle can be obtained by measuring the phase difference between the voltage and the current. In an ideal case, the power factor angle should be 0 degrees, where the voltage and current are synchronized. In a practical circuit, the power factor angle is not 0 degrees due to the nature of the load and the loss of the grid system.
The power factor angle is the angle between apparent power and active power. The larger the power factor angle phi, the lower the measured power factor cos phi, indicating a larger reactive component.
The ratio of active power to reactive power can be calculated according to the power factor angle, the ratio is compared with the system load characteristic, and if the ratio is consistent, the measured polarity is unchanged after the new equipment of the transformer substation is put into operation or the secondary current loop is changed.
S14: and if the difference flow amplitude is smaller than the difference flow threshold value, judging that the verification is passed.
And the difference flow amplitude is smaller than the difference flow threshold value, and the voltage, the current and the polarity collected by the protection device of the transformer station are judged to pass the verification.
Preferably, the differential flow threshold is set to 0.05 times the secondary rated current, which is 1A or 5A.
The method for verifying the transformer substation load comprises the steps of obtaining sampling data when the transformer substation load is borne, wherein the sampling data comprise three-phase voltage amplitude values, three-phase voltage phase angles, three-phase current amplitude values and three-phase current phase angles. And detecting the amplitude of the three-phase voltage and detecting the phase sequence of the phase angle of the three-phase voltage. When the amplitudes of the three-phase voltages are similar and the phase angles of the three-phase voltages are positive phase sequences, the amplitudes and the phase angles of the three-phase voltages are verified. And detecting the amplitude of the three-phase current and detecting the phase sequence of the phase angle of the three-phase current. When the three-phase current amplitude is similar and the three-phase current phase angle is a positive phase sequence, the three-phase current amplitude and the three-phase current phase angle are verified, the three-phase voltage and the three-phase current are verified, the three-phase alternating current power supply efficiency is high, and the power supply safety is good. And calculating an included angle between the single-phase voltage and the single-phase current to obtain a power factor angle. Comparing the calculated power factor angle with the detected system load characteristic, and when the power factor angle is consistent with the system load characteristic, indicating that the polarity of the protection device is correct after the protection device is put into operation. And detecting the difference flow amplitude after load, and judging that the verification is passed when the difference flow amplitude is smaller than the difference flow threshold. According to the method, the voltage, the current and the polarity of the transformer substation are automatically checked according to the three-phase voltage amplitude, the three-phase voltage phase angle, the three-phase current amplitude, the three-phase current phase angle, the power factor angle and the differential current amplitude, the efficiency of load check of the transformer substation is improved, and the verification according to a preset rule has higher accuracy. In addition, because manual field verification is not needed, circuit faults and personnel electric shock caused by improper manual operation can be avoided.
Example two
Fig. 2 is a flowchart of a method for checking load on a transformer substation according to a second embodiment of the present invention, where the method for checking load on a transformer substation according to the first embodiment of the present invention is refined. As shown in fig. 2, the method includes the following steps S20 to S31:
s20: and acquiring sampling data of the transformer substation when the transformer substation is loaded, wherein the sampling data comprises three-phase voltage amplitude values, three-phase voltage phase angles, three-phase current amplitude values and three-phase current phase angles.
The secondary operation and maintenance control platform is arranged at the main station end, and when a new device of the transformer substation is put into operation or a secondary current loop is changed, the secondary operation and maintenance control platform at the main station end acquires sampling data of a protection device of the transformer substation through a dispatching data network.
The three-phase voltage amplitude includes an a-phase voltage amplitude, a B-phase voltage amplitude, and a C-phase voltage amplitude, and the three-phase voltage phase angle includes an a-phase voltage phase angle, a B-phase voltage phase angle, and a C-phase voltage phase angle. The three-phase current amplitude includes an A-phase current amplitude, a B-phase current amplitude, and a C-phase current amplitude, and the three-phase current phase angle includes an A-phase current phase angle, a B-phase current phase angle, and a C-phase current phase angle.
S21: and calculating the difference between the amplitude of the A-phase voltage and the amplitude of the B-phase voltage to obtain a first voltage difference value.
As an example, the a-phase voltage amplitude is 60V, the b-phase voltage amplitude is 60V, and the first voltage difference is 0V.
S22: and calculating the difference between the amplitude of the A-phase voltage and the amplitude of the C-phase voltage to obtain a second voltage difference value.
As an example, the a-phase voltage amplitude is 60V, the c-phase voltage amplitude is 60V, and the second voltage difference is 0V.
S23: and calculating the difference between the amplitude of the B-phase voltage and the amplitude of the C-phase voltage to obtain a third voltage difference value.
As an example, the B-phase voltage amplitude is 60V, the c-phase voltage amplitude is 60V, and the third voltage difference is 0V.
S24: and detecting whether the first voltage difference value, the second voltage difference value and the third voltage difference value are smaller than a first voltage difference threshold value, and if yes, the three-phase voltage amplitude values are similar.
The first voltage difference threshold is set to 2V in the line interval check rule, the segment interval check rule, the bus-bar interval check rule, and the main transformer interval check rule.
As an example, the first voltage difference, the second voltage difference, and the third voltage difference are all 0V, and the three-phase voltages have similar magnitudes.
S25: it is detected whether the B-phase voltage phase angle lags the a-phase voltage phase angle by a first angle threshold.
As an example, the a-phase voltage phase angle is 0 degrees, the B-phase voltage phase angle is-120 degrees, and the B-phase voltage phase angle lags the a-phase voltage phase angle by 120 degrees.
S26: detecting whether a C-phase voltage phase angle lags the B-phase voltage phase angle by the first angle threshold.
As an example, the C-phase voltage phase angle is 120 degrees, the B-phase voltage phase angle is-120 degrees, and the C-phase voltage phase angle lags the B-phase voltage phase angle by 120 degrees.
S27: and if the B-phase voltage phase angle lags the A-phase voltage phase angle by the first angle threshold value and the C-phase voltage phase angle lags the B-phase voltage phase angle by the first angle threshold value, the three-phase voltage phase angle is a positive phase sequence.
Preferably, the first standard angle is set to 120 degrees, the first angle error is set to 5 degrees, and the first angle threshold is in the range of 115-125 degrees.
As an example, the a-phase voltage phase angle is 0 degrees, the B-phase voltage phase angle is-120 degrees, the C-phase voltage phase angle is 120 degrees, the B-phase voltage phase angle lags the a-phase voltage phase angle by 120 degrees, and the C-phase voltage phase angle lags the B-phase voltage phase angle by 120 degrees. The first angle threshold is 120 degrees, and the three-phase voltage phase angle is the positive phase sequence. The phase angle of the A phase voltage is 0 degree, the phase angle of the B phase voltage is-118 degrees, the phase angle of the C phase voltage is 122 degrees, the phase angle of the B phase voltage lags behind the phase angle of the A phase voltage by 118 degrees, the phase angle of the C phase voltage lags behind the phase angle of the B phase voltage by 120 degrees, and the phase angle of the three-phase voltage is positive phase sequence.
S28: and when the three-phase voltage amplitude values are similar and the three-phase voltage phase angle is a positive phase sequence, detecting the amplitude value of the three-phase current amplitude value and detecting the phase sequence of the three-phase current phase angle.
Step S28 includes the following steps S281-S288:
s281: the three-phase voltages have similar magnitudes, and the phase angles of the three-phase voltages are positive phase sequences.
The three-phase voltages have similar amplitude values, the phase angles of the three-phase voltages are positive phase sequences, and the three-phase voltages pass verification.
S282: and calculating the difference between the amplitude of the phase A current and the amplitude of the phase B current to obtain a first current difference value.
As an example, the a-phase current magnitude is 0.12A, the b-phase current magnitude is 0.12A, and the first current difference is 0A.
S283: and calculating the difference between the A-phase current amplitude and the C-phase current amplitude to obtain a second current difference value.
As an example, the a-phase current magnitude is 0.12A, the c-phase current magnitude is 0.12A, and the second current difference is 0A.
S284: and calculating the difference between the B-phase current amplitude and the C-phase current amplitude to obtain a third current difference value.
The B phase current amplitude is 0.12A, the C phase current amplitude is 0.12A, and the third current difference is 0A.
S285: and detecting whether the first current difference value, the second current difference value and the third current difference value are smaller than a first current difference threshold value, and if yes, the three-phase current amplitude values are similar.
Preferably, the first current difference threshold is set to 0.02 times the secondary rated current, which is 1A or 5A.
As an example, the first current difference value, the second current difference value, and the third current difference value are all 0A, the first current difference threshold value is set to 0.02A, and the three-phase current amplitudes are similar.
S286: and detecting whether the phase angle of the B-phase current lags behind a second angle threshold of the phase angle of the A-phase current.
Preferably, the standard angle is set to 120 degrees, the angle error is set to 10 degrees, and the second angle threshold is in the range of 110 degrees to 130 degrees.
By way of example, the A-phase current phase angle is-30 degrees, the B-phase current phase angle is-150 degrees, and the B-phase current phase angle lags the A-phase current phase angle by 120 degrees.
S287: detecting whether a C-phase current phase angle lags the B-phase current phase angle by the second angle threshold.
As an example, the C-phase current phase angle is 90 degrees, the B-phase current phase angle is-150 degrees, and the C-phase current phase angle lags the B-phase current phase angle by 120 degrees.
S288: and if the B-phase current phase angle lags the A-phase current phase angle by the second angle threshold value and the C-phase current phase angle lags the B-phase current phase angle by the second angle threshold value, the three-phase current phase angle is a positive phase sequence.
As an example, the B-phase current phase angle lags the a-phase current phase angle by 120 degrees, the C-phase current phase angle lags the B-phase current phase angle by 120 degrees, and the three-phase current phase angle is a positive phase sequence.
S29: and when the three-phase current amplitude values are similar and the three-phase current phase angle is a positive phase sequence, calculating an included angle between the single-phase voltage and the single-phase current to obtain a power factor angle.
As an example, the a-phase voltage phase angle is 0 degrees, the a-phase current phase angle is-30 degrees, and the power factor angle is 30 degrees.
S30: and detecting whether the power factor angle is consistent with the system load characteristic, and if so, detecting the difference flow amplitude value after load.
Collecting current at two sides of a transformer substation, and detecting differential flow through optical fiber transmission, wherein if the differential flow is 0, the differential flow is a fault outside a zone; if the fault is in the zone, the differential flow is not 0. When the load changes, zero drift is affected, and the influence on the amplitude of the differential flow is small.
Step S30 includes the following steps S301-S305:
s301: and acquiring system load characteristics acquired by the dispatching automation system, wherein the system load characteristics comprise active power and reactive power.
Active power is denoted P and reactive power is denoted Q. Active power refers to the ability of a circuit to actually generate power, and is the power of converting electric energy into other forms of energy; reactive power is power that causes energy flow in an electrical power system, but does not appear to be acting on the outside.
S302: and calculating apparent power according to the active power and the reactive power, and calculating the ratio of the active power to the apparent power to obtain a system power factor.
The apparent power is calculated as:
wherein P is active power, Q is reactive power, and S is apparent power.
The calculation formula of the system power factor is as follows:
wherein,is the system power factor.
S303: and calculating a trigonometric function of the power factor angle to obtain a measured power factor, and if the measured power factor is equal to the system power factor, the power factor angle is consistent with the system load characteristic.
Converting the power factor angle phi into the measured power factor cos phi, if the measured power factor cos phi and the system power factor phi areEqual, the power factor angle is consistent with the system load characteristics.
Preferably, after determining that the power factor angle and the system load characteristic agree, detecting a phase angle difference between the high-side voltage and the low-side voltage, and detecting a phase angle difference between the high-side current and the low-side current are further included. If the wiring mode of the transformer substation is that the primary winding is in star connection and the secondary winding is in angle connection, and the type of a transformer of the transformer substation is that two windings are changed, the voltage of the low-voltage side is 30 degrees ahead of the voltage of the high-voltage side, and the current of the high-voltage side is 150 degrees ahead of the current of the low-voltage side. For example low-side A-phase voltage U a 30 DEG, high-side A-phase voltage U A 0 degree, low side phase A current I a At-150 degrees, high side phase A current I A Is 0 degrees.
S304: and if the power factor angle is consistent with the system load characteristic, detecting the differential flow amplitude of the line protection differential flow and the bus protection differential flow.
The line protection differential current is the difference between the current flowing into the line protection unit and the current flowing out of the line protection unit, and the bus protection differential current is the difference between the current flowing into the bus protection unit and the current flowing out of the bus protection unit.
Specifically, the line protection unit adopts the interval current at two sides of the transformer substation to perform differential protection, and the bus protection unit adopts the current at each interval connected to the bus protection device to perform differential protection.
S305: and if the power factor angle is consistent with the system load characteristic, detecting the differential flow amplitude values of the large differential flow and the small differential flow of the busbar protection.
The large difference flow refers to the phasor sum of all the outgoing line unit currents except the bus bar switching current on the two sections of buses, and the small difference flow refers to the phasor sum of the outgoing line unit currents including the bus bar switching current on a certain section of bus bar.
The large difference flow is used for judging whether the bus has faults or not, and the small difference flow is used for selecting the fault bus and determining which bus segment the faults occur on.
S31: and if the difference flow amplitude is smaller than the difference flow threshold value, judging that the verification is passed.
And the difference flow amplitude is smaller than the difference flow threshold value, and the voltage, the current and the polarity collected by the protection device of the transformer station are judged to pass the verification.
Preferably, the differential flow threshold is set to 0.05 times the secondary rated current, which is 1A or 5A.
According to the method for verifying the transformer substation load provided by the second embodiment of the invention, whether the three-phase voltage amplitudes are similar or not is judged by calculating the difference value between the voltage amplitudes of different phases. And comparing the phase angles of the different phase voltages to judge that the phase angles of the three phase voltages are positive phase sequences. And calculating apparent power according to the active power and the reactive power of the system load characteristics, and calculating the ratio of the active power to the apparent power to obtain the system power factor. The power factor angle is converted into a measured power factor, and if the measured power factor is equal to the system power factor, the power factor angle is consistent with the system load characteristic. And detecting the difference flow amplitude after load, and if the difference flow amplitude is smaller than the difference flow threshold, judging that the verification is passed. The method can realize verification of voltage and current by comparing voltage amplitude values and voltage phase angles of different phases through subtraction operation. The measured power factor can be obtained through division operation and trigonometric function operation, and the polarity can be checked by comparing the measured power factor with the system power factor. The operation amount of the verification of the voltage, the current and the polarity is small, and the efficiency of parameter verification of the transformer substation is high.
Example III
Fig. 3 is a schematic structural diagram of a transformer substation load verification device according to a third embodiment of the present invention. As shown in fig. 3, the apparatus includes:
the sampling data acquisition module 100 is used for acquiring sampling data of the transformer substation when the transformer substation is loaded, wherein the sampling data comprises three-phase voltage amplitude values, three-phase voltage phase angles, three-phase current amplitude values and three-phase current phase angles;
the amplitude and phase angle detection module 200 is configured to detect an amplitude of the three-phase voltage and detect a phase sequence of the phase angle of the three-phase voltage; when the three-phase voltage amplitude values are similar and the three-phase voltage phase angle is a positive phase sequence, detecting the amplitude value of the three-phase current amplitude value, and detecting the phase sequence of the three-phase current phase angle;
the voltage-current included angle calculating module 300 is configured to calculate an included angle between the single-phase voltage and the single-phase current when the three-phase current has similar amplitude and the phase angle of the three-phase current is a positive phase sequence, so as to obtain a power factor angle;
the difference flow amplitude detection module 400 is configured to detect whether the power factor angle is consistent with a system load characteristic, and if so, detect a difference flow amplitude after load;
the verification determining module 500 is configured to determine that verification is passed if the differential flow amplitude is less than the differential flow threshold.
Optionally, the amplitude and phase angle detection module 200 includes:
the first voltage difference value calculation unit is used for calculating the difference between the amplitude value of the A-phase voltage and the amplitude value of the B-phase voltage to obtain a first voltage difference value;
the second voltage difference value calculation unit is used for calculating the difference between the amplitude value of the A-phase voltage and the amplitude value of the C-phase voltage to obtain a second voltage difference value;
a third voltage difference calculating unit, configured to calculate a difference between the B-phase voltage amplitude and the C-phase voltage amplitude, to obtain a third voltage difference;
and the three-phase voltage amplitude verification unit is used for detecting whether the first voltage difference value, the second voltage difference value and the third voltage difference value are smaller than a first voltage difference threshold value or not, and if yes, the three-phase voltage amplitudes are similar.
Optionally, the amplitude and phase angle detection module 200 includes:
the first voltage phase angle detection unit is used for detecting whether the B-phase voltage phase angle lags behind the A-phase voltage phase angle by a first angle threshold;
the second voltage phase angle detection unit is used for detecting whether the C-phase voltage phase angle lags behind the B-phase voltage phase angle by the first angle threshold value;
and the three-phase voltage phase angle judging unit is used for judging whether the B-phase voltage phase angle lags the A-phase voltage phase angle by the first angle threshold value and the C-phase voltage phase angle lags the B-phase voltage phase angle by the first angle threshold value, if the B-phase voltage phase angle lags the A-phase voltage phase angle, the three-phase voltage phase angle is a positive phase sequence.
Optionally, the amplitude and phase angle detection module 200 includes:
the first current difference value calculation unit is used for calculating the difference between the amplitude value of the A-phase current and the amplitude value of the B-phase current to obtain a first current difference value;
the second current difference value calculation unit is used for calculating the difference between the A-phase current amplitude and the C-phase current amplitude to obtain a second current difference value;
a third current difference calculating unit, configured to calculate a difference between the B-phase current amplitude and the C-phase current amplitude, to obtain a third current difference;
and the three-phase current amplitude verification unit is used for detecting whether the first current difference value, the second current difference value and the third current difference value are smaller than a first current difference threshold value or not, and if yes, the three-phase current amplitudes are similar.
Optionally, the amplitude and phase angle detection module 200 includes:
the first current phase angle detection unit is used for detecting whether the phase angle of the B-phase current lags behind a second angle threshold of the phase angle of the A-phase current;
a second current phase angle detection unit for detecting whether a C-phase current phase angle lags the B-phase current phase angle by the second angle threshold;
and the three-phase current phase angle verification unit is used for enabling the three-phase current phase angle to be a positive phase sequence if the B-phase current phase angle lags behind the A-phase current phase angle by the second angle threshold value and the C-phase current phase angle lags behind the B-phase current phase angle by the second angle threshold value.
Optionally, the difference stream amplitude detection module 400 includes:
the system load characteristic acquisition unit is used for acquiring system load characteristics acquired by the dispatching automation system, wherein the system load characteristics comprise active power and reactive power;
the system power factor calculation unit is used for calculating apparent power according to the active power and the reactive power, calculating the ratio of the active power to the apparent power and obtaining a system power factor;
and the power factor angle checking unit is used for calculating a trigonometric function of the power factor angle to obtain a measured power factor, and if the measured power factor is equal to the system power factor, the power factor angle is consistent with the system load characteristic.
Optionally, the difference stream amplitude detection module 400 includes:
the first differential flow amplitude detection unit is used for detecting differential flow amplitude values of the line protection differential flow and the bus protection differential flow;
and the second differential flow amplitude detection unit is used for detecting the differential flow amplitude of the large differential flow and the small differential flow protected by the bus.
The on-load verification device for the transformer substation provided by the third embodiment of the invention can execute the on-load verification method for the transformer substation provided by the first embodiment or the second embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example IV
Fig. 4 shows a schematic diagram of the structure of an electronic device 10 that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 4, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as the substation load verification method.
In some embodiments, the substation load verification method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the substation load verification method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the substation load verification method in any other suitable way (e.g. by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The method for verifying the load of the transformer substation is characterized by comprising the following steps of:
acquiring sampling data of a transformer substation when the transformer substation is loaded, wherein the sampling data comprises three-phase voltage amplitude values, three-phase voltage phase angles, three-phase current amplitude values and three-phase current phase angles;
detecting the amplitude of the three-phase voltage and detecting the phase sequence of the phase angle of the three-phase voltage; when the three-phase voltage amplitude values are similar and the three-phase voltage phase angle is a positive phase sequence, detecting the amplitude value of the three-phase current amplitude value, and detecting the phase sequence of the three-phase current phase angle;
When the three-phase current amplitude values are similar and the three-phase current phase angle is a positive phase sequence, calculating an included angle between the single-phase voltage and the single-phase current to obtain a power factor angle;
detecting whether the power factor angle is consistent with the system load characteristics, if so, detecting the difference flow amplitude value after load;
and if the difference flow amplitude is smaller than the difference flow threshold value, judging that the verification is passed.
2. The method for checking load on a transformer substation according to claim 1, wherein the detecting the amplitude of the three-phase voltage comprises:
calculating the difference between the amplitude of the A-phase voltage and the amplitude of the B-phase voltage to obtain a first voltage difference;
calculating the difference between the amplitude of the A-phase voltage and the amplitude of the C-phase voltage to obtain a second voltage difference;
calculating the difference between the B-phase voltage amplitude and the C-phase voltage amplitude to obtain a third voltage difference;
and detecting whether the first voltage difference value, the second voltage difference value and the third voltage difference value are smaller than a first voltage difference threshold value, and if yes, the three-phase voltage amplitude values are similar.
3. The method for checking load on a transformer substation according to claim 1, wherein the detecting the phase sequence of the three-phase voltage phase angle comprises:
Detecting whether the phase angle of the B-phase voltage lags behind a first angle threshold of the phase angle of the A-phase voltage;
detecting whether a C-phase voltage phase angle lags the B-phase voltage phase angle by the first angle threshold;
and if the B-phase voltage phase angle lags the A-phase voltage phase angle by the first angle threshold value and the C-phase voltage phase angle lags the B-phase voltage phase angle by the first angle threshold value, the three-phase voltage phase angle is a positive phase sequence.
4. The method for checking load on a transformer substation according to claim 1, wherein the detecting the amplitude of the three-phase current comprises:
calculating the difference between the amplitude of the phase A current and the amplitude of the phase B current to obtain a first current difference value;
calculating the difference between the A-phase current amplitude and the C-phase current amplitude to obtain a second current difference;
calculating the difference between the B-phase current amplitude and the C-phase current amplitude to obtain a third current difference;
and detecting whether the first current difference value, the second current difference value and the third current difference value are smaller than a first current difference threshold value, and if yes, the three-phase current amplitude values are similar.
5. The method for checking load on a transformer substation according to claim 1, wherein the detecting the phase sequence of the phase angle of the three-phase current comprises:
Detecting whether the phase angle of the B-phase current lags behind a second angle threshold of the phase angle of the A-phase current;
detecting whether a phase angle of the C-phase current lags behind the phase angle of the B-phase current by the second angle threshold;
and if the B-phase current phase angle lags the A-phase current phase angle by the second angle threshold value and the C-phase current phase angle lags the B-phase current phase angle by the second angle threshold value, the three-phase current phase angle is a positive phase sequence.
6. The method for checking load on a transformer substation according to claim 1, wherein said detecting whether the power factor angle is consistent with a system load characteristic comprises:
acquiring system load characteristics acquired by a dispatching automation system, wherein the system load characteristics comprise active power and reactive power;
calculating apparent power according to the active power and the reactive power, and calculating the ratio of the active power to the apparent power to obtain a system power factor;
and calculating a trigonometric function of the power factor angle to obtain a measured power factor, and if the measured power factor is equal to the system power factor, the power factor angle is consistent with the system load characteristic.
7. The method for checking the load of the transformer substation according to claim 2, wherein the detecting the difference current amplitude after the load comprises:
Detecting a differential flow amplitude of a line protection differential flow and a bus protection differential flow;
or detecting the difference flow amplitude of the large difference flow and the small difference flow of bus protection.
8. The utility model provides a verification device that transformer substation loaded, which characterized in that includes:
the sampling data acquisition module is used for acquiring sampling data of the transformer substation when the transformer substation is loaded, wherein the sampling data comprises three-phase voltage amplitude values, three-phase voltage phase angles, three-phase current amplitude values and three-phase current phase angles;
the amplitude and phase angle detection module is used for detecting the amplitude of the three-phase voltage and detecting the phase sequence of the phase angle of the three-phase voltage; when the three-phase voltage amplitude values are similar and the three-phase voltage phase angle is a positive phase sequence, detecting the amplitude value of the three-phase current amplitude value, and detecting the phase sequence of the three-phase current phase angle;
the voltage and current included angle calculation module is used for calculating the included angle between the single-phase voltage and the single-phase current to obtain a power factor angle when the three-phase current amplitude is similar and the three-phase current phase angle is a positive phase sequence;
the differential flow amplitude detection module is used for detecting whether the power factor angle is consistent with the system load characteristics, and if so, detecting the differential flow amplitude after load;
And the verification judging module is used for judging that verification is passed if the differential flow amplitude is smaller than the differential flow threshold value.
9. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method of checking the load of the substation of any one of claims 1-7.
10. A computer readable storage medium, characterized in that it stores computer instructions for causing a processor to implement the method for checking the load of a substation according to any one of claims 1-7 when executed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117849692A (en) * | 2024-03-08 | 2024-04-09 | 武汉格蓝若智能技术股份有限公司 | Method and system for monitoring phase sequence abnormality of secondary circuit of transformer in transformer substation |
| CN117849692B (en) * | 2024-03-08 | 2024-05-31 | 武汉格蓝若智能技术股份有限公司 | Method and system for monitoring phase sequence abnormality of secondary circuit of transformer in transformer substation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117849692A (en) * | 2024-03-08 | 2024-04-09 | 武汉格蓝若智能技术股份有限公司 | Method and system for monitoring phase sequence abnormality of secondary circuit of transformer in transformer substation |
| CN117849692B (en) * | 2024-03-08 | 2024-05-31 | 武汉格蓝若智能技术股份有限公司 | Method and system for monitoring phase sequence abnormality of secondary circuit of transformer in transformer substation |
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