CN111416363A - AVC-based voltage regulation effectiveness judgment method and system - Google Patents
AVC-based voltage regulation effectiveness judgment method and system Download PDFInfo
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- CN111416363A CN111416363A CN202010509835.5A CN202010509835A CN111416363A CN 111416363 A CN111416363 A CN 111416363A CN 202010509835 A CN202010509835 A CN 202010509835A CN 111416363 A CN111416363 A CN 111416363A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
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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
- G01R19/12—Measuring rate of change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention provides a voltage regulation effectiveness judging method based on AVC, which comprises the steps of S1, monitoring the condition of bus voltage of each transformer substation in real time, recording the initial value of the bus voltage, S2, judging whether the bus voltage is out of limit, if so, AVC generates a voltage regulation strategy command and is executed, otherwise, returning to the step S1, S3, calculating the difference value △ U of the bus voltage before and after voltage regulation strategy regulation, S4, judging whether the | △ U | is larger than a reference value, if so, executing the step S5, otherwise, AVC locks the voltage regulation of a bus, S5, judging whether the direction of bus voltage change is consistent with the direction of the voltage regulation strategy command, if so, AVC voltage regulation is effective, otherwise, the voltage regulation of the AVC is locked, and the voltage regulation effectiveness judging system based on AVC is further provided, so that the problem of error regulation or abnormal operation caused when data sent by remote operation of the transformer substation are asynchronous with actual operation data is solved, and the power supply reliability is improved.
Description
Technical Field
The invention relates to the technical field of judgment of voltage regulation effectiveness of a transformer substation, in particular to a method and a system for judging voltage regulation effectiveness based on AVC.
Background
AVC (automatic Voltage control) refers to automatic Voltage reactive power control of a power grid, and is widely applied to power dispatching automation systems at present, is responsible for monitoring the reactive power and Voltage of a transformer substation in real time, and realizes the control and regulation of the Voltage and the reactive power of the transformer substation by the lifting of a main gear in the transformer substation and the switching operation of a capacitor/reactor, so that the Voltage and the reactive power can be guaranteed to be operated at a qualified level.
The method has the advantages that the voltage regulation can be performed with high precision, high speed and stable change, and meanwhile, a more obvious effect can be achieved in the aspect of preventing voltage fluctuation and sudden change, but when the voltage regulation is not actually performed based on the AVC, the AVC is highly dependent on the accuracy of data sent by a substation in a telecontrol mode, when the data sent by the substation in the telecontrol mode are inaccurate or not in time, 10kV bus voltage data acquired by the AVC system are not synchronous with actual operation data, the misoperation or abnormal operation can be caused, the normal operation of an electric power system is even influenced in severe cases, and the reliability of power supply is reduced.
Therefore, it is necessary to provide a method and a system for determining the validity of voltage regulation based on AVC.
Disclosure of Invention
In order to solve the problem of error regulation or abnormal operation of AVC (automatic Voltage control) after data acquisition when data uploaded by a substation telecontrol is asynchronous with actual operation data, the invention provides a voltage regulation effectiveness judgment method and system based on AVC, which avoid the occurrence of voltage over-regulation phenomenon caused by inaccurate data uploading, improve the power supply reliability and ensure the stable operation of a power grid.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a voltage regulation effectiveness judgment method based on AVC at least comprises the following steps:
s1, monitoring the condition of bus voltage of each transformer substation in real time through AVC to obtain the firstiInitial value of bar bus voltageU 1；
S2, judgingiIf the voltage of the strip bus is out of limit, AVC generates a voltage regulation strategy command, and each transformer substation executes the voltage regulation strategy command, otherwise, the step S1 is returned;
s3, collecting the voltage regulated by a voltage regulation strategyiValue of bar bus voltageU 2Calculating AVC Voltage adjustment strategy before and after adjustmentiDifference △ U in bar bus voltage;
s4, judging whether the absolute value of △ U is larger than a reference value, if so, executing a step S5, otherwise, locking the AVC to the fourth stepiVoltage regulation of the strip bus;
s5, judging whether the bus voltage change direction is consistent with the direction of the AVC voltage regulation strategy command or not according to the △ U size, if so, effectively regulating the AVC voltage, otherwise, locking the AVC to the firstiAnd adjusting the voltage of the strip bus.
Herein, if it isiStrip busIf the voltage of (1) is not out of limit, it indicates the firstiThe voltage of the strip bus is within the voltage operation range allowed by the system, namely, an AVC generated voltage regulation strategy is not caused, the problem of effectiveness of AVC voltage regulation is avoided, the AVC still continuously monitors the condition of the bus voltage of each substation in real time, and in addition, whether the bus voltage exceeds the limit is also judged in the AVC.
Preferably, the judgment in the step S2 is the firstiThe method for judging whether the voltage of the bar bus is out of limit or not comprises the following steps: value at any moment of bus voltageUSatisfies the following conditions: 10.1 is less than or equal toUWhen the concentration is less than or equal to 10.6, the second stepiThe voltage of the bar bus is not out of limit, otherwise, the firstiThe voltage of the bar bus is out of limit.
When the AVC monitors that the bus voltage of the transformer substation is lower than 10.1kV or higher than 10.6kV in real time, the bus voltage is out of limit, and an AVC generates a voltage regulation strategy according to the actual operation condition under the normal condition, so that the out-of-limit bus voltage is restored to be within the normal allowable voltage operation range of the system after the AVC voltage regulation.
Preferably, the voltage regulation strategy command is to throw and withdraw a capacitor/reactor bank or lift a main transformer gear; when the AVC voltage regulation strategy command is to increase the gear of the main transformer, the numerical value of the gear of the main transformer is increased by 1, and when the AVC voltage regulation strategy command is to reduce the gear of the main transformer, the numerical value of the gear of the main transformer is decreased by 1.
Preferably, when the AVC voltage adjustment strategy command is to trip the capacitor/reactor bank, the specific process of step S4 is:
s401, collecting △ Uq of bus voltage regulation sensitivity parameters of each transformer substation from a dispatching automation system database;
s402, calculating a voltage regulation reference value △ Uk when the capacitor/reactor group is switched on or off according to the bus voltage regulation sensitivity parameter △ Uq, wherein the calculation formula is as follows:
△Uk=C×△Uq×50%
wherein △ Uk represents the voltage regulation reference value when the capacitor/reactor group is switched on or off, C represents the capacity of the capacitor/reactor group;
s403, judging whether the voltage value of △ U is larger than the voltage regulation reference value △ Uk when the capacitor/reactor group is switched on or off, if so, executing the step S5, otherwise, AVC locks the second voltage valueiAnd adjusting the voltage of the strip bus.
Here, the voltage adjustment reference value △ Uk at the time of turning on and off the capacitor/reactor bank indicates a voltage change amount judgment reference value of the bus voltage after the voltage adjustment strategy command is executed, and when it is judged that | △ U | is larger than the voltage adjustment reference value △ Uk at the time of turning on and off the capacitor/reactor bank, it indicates that the bus voltage significantly changes after the capacitor/reactor bank voltage adjustment strategy command is turned on and off, and therefore, after a condition that the bus voltage significantly changes after the voltage adjustment is satisfied, the step S5 is further executed to judge whether the direction of change of the bus voltage coincides with the direction of the AVC voltage adjustment strategy command.
Preferably, when the AVC voltage regulation strategy commands the raising and lowering of the main transformer gear, the specific process of step S4 is:
s411, collecting gear voltage regulation sensitivity parameters △ Uu of the main transformer of each transformer substation from a scheduling automation system database;
s412, taking the main transformer gear voltage regulation sensitivity parameter △ Uu as a voltage regulation reference value when the main transformer gear is lifted;
s413, judging whether | △ U | is greater than △ Uu, if yes, executing the step S5, otherwise, locking the AVC to the fourth positioniAnd adjusting the voltage of the strip bus.
Preferably, the AVC voltage regulation strategy is first and secondiThe difference △ U between the bar bus voltages is calculated as:
△U=U 2-U 1
wherein the content of the first and second substances,U 2for the first time after being regulated by AVC voltage regulation strategyiThe value of the bar bus voltage;U 1is as followsiInitial value of bar bus voltage.
Here, if it is determined that | △ U | is greater than the main transformer gear voltage regulation sensitivity parameter △ Uu after the main transformer gear is lifted, it indicates that the bus voltage has significantly changed after being commanded by the voltage regulation strategy for lifting the main transformer gear, and therefore, after the condition that the bus voltage has significantly changed is satisfied, step S5 is further executed to determine whether the direction of change of the bus voltage is consistent with the direction of the AVC voltage regulation strategy command.
Preferably, when the AVC voltage regulation strategy command is to put in a capacitor bank of the capacitor/reactor bank, the bus voltage rises, and if △ U is greater than 0, the direction of change of the bus voltage is the same as the direction of the AVC voltage regulation strategy command, the AVC voltage regulation is valid, otherwise, the AVC latch is the second to latchiWhen the AVC voltage regulation strategy command is a reactor group for putting in a capacitor/reactor group, the bus voltage is reduced, if △ U is less than 0, the bus voltage change direction is consistent with the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC lock is the firstiWhen the AVC voltage regulation strategy command is a capacitor bank exiting the capacitor/reactor bank, the bus voltage is reduced, if △ U is less than 0, the bus voltage change direction is consistent with the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC lock is the firstiWhen the AVC voltage regulation strategy command is to exit the reactor group of the capacitor/reactor group, the bus voltage rises, if △ U is more than 0, the bus voltage change direction is consistent with the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC lock is the firstiAnd adjusting the voltage of the strip bus.
Preferably, when the AVC voltage regulation strategy commands to increase the gear of the main transformer, the bus voltage is increased, if △ U is more than 0, the direction of the change of the bus voltage is consistent with the direction of the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC is lockediWhen the AVC voltage regulation strategy command is to reduce the gear of the main transformer, the bus voltage is reduced, if △ U is less than 0, the direction of the bus voltage change is consistent with the direction of the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC is locked for the first timeiAnd adjusting the voltage of the strip bus.
In this case, the voltage is adjustedAfter festival, if it isiThe bus voltage of the strip bus simultaneously meets the conditions that the bus voltage is remarkably changed and the bus voltage changing direction is consistent with the direction of the AVC voltage regulation strategy command, so that the AVC-based voltage regulation is effective, and the AVC continuously monitors the condition of the bus voltage of each transformer substation in real time; if the bus voltage does not meet the condition that the bus voltage changes remarkably or does not meet the condition that the bus voltage change direction is consistent with the direction of the AVC voltage regulation strategy command, namely the second AVC strategyiThe voltage regulation of the bar bus can have a mis-regulation phenomenon, and the AVC is lockediThe voltage regulation of the strip bus only monitors the data of the bus voltage, and does not send out a voltage regulation strategy instruction any more, so that the phenomenon of voltage over-regulation caused by inaccurate uploading of telecontrol data of the transformer substation is avoided.
The invention also provides an AVC-based voltage regulation effectiveness judgment system, which is used for realizing the AVC-based voltage regulation effectiveness judgment method, and the system comprises the following steps:
the dispatching automation system database is used for receiving real-time operation data of the transformer substation transmitted by the transformer substation telemechanical transmission device and storing a bus voltage regulation sensitivity parameter △ Uq of each transformer substation and a main transformer gear voltage regulation sensitivity parameter △ Uu;
AVC, acquiring real-time operation data of the transformer substation from a dispatching automation system database, monitoring the condition of bus voltage of each transformer substation in real time, generating a voltage regulation strategy command, judging whether the bus voltage change direction is consistent with the direction of the AVC voltage regulation strategy command or not, and generating a voltage regulation locking command;
the substation telecontrol transmission devices transmit real-time operation data of the substations to a dispatching automation system database, and a voltage regulation strategy instruction execution unit and a voltage regulation locking instruction execution unit are arranged in any one of the substation telecontrol transmission devices and are respectively used for executing a voltage regulation strategy instruction and a voltage regulation locking instruction issued by AVC.
Preferably, the AVC is provided with a voltage regulation strategy instruction generation module, a voltage regulation locking instruction generation module and a direction consistency judgment module, the voltage regulation strategy instruction generation module generates a voltage regulation strategy instruction, the voltage regulation strategy instruction is transmitted to the voltage regulation strategy instruction execution unit and executed, the bus voltage of each substation is changed, and the direction consistency judgment module judges whether the bus voltage change direction is consistent with the direction of the AVC voltage regulation strategy instruction.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a voltage regulation effectiveness judgment method and system based on AVC, wherein the condition of bus voltage of each transformer substation is monitored in real time through AVC, if the voltage of a bus is out of limit, AVC generates a voltage regulation strategy command, after the voltage regulation strategy command is executed, whether the bus voltage is obviously changed relative to a reference value is judged according to the comparison of a bus voltage change value and a set reference value, and then whether the bus voltage change direction is consistent with the direction of the AVC voltage regulation strategy command is judged, so that whether the AVC voltage regulation is effective is judged, and if the two judgment conditions are not met, the AVC is used for the second judgment conditioniThe voltage regulation of the bar bus has the possibility of error regulation, and AVC is lockediThe voltage regulation of the strip bus only monitors the data of the bus voltage, and does not send out a voltage regulation strategy instruction any more, so that the phenomenon of voltage excess regulation caused by inaccurate transmission of telecontrol data of the transformer substation is avoided, the power supply reliability is improved, and the stable operation of a power grid is ensured.
Drawings
FIG. 1 is a flow chart of an AVC based voltage regulation validity determination method in accordance with the present invention;
fig. 2 shows a block diagram of the connection structure of the AVC-based voltage regulation validity determination system according to the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for better illustration of the present embodiment, certain parts of the drawings may be omitted, enlarged or reduced, and do not represent actual dimensions;
it will be understood by those skilled in the art that certain well-known descriptions of the figures may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
Fig. 1 is a flowchart of an AVC-based voltage regulation validity determination method, which includes:
s1, monitoring the condition of bus voltage of each transformer substation in real time through AVC to obtain the firstiInitial value of bar bus voltageU 1；
S2, judgingiIf the voltage of the strip bus is out of limit, AVC generates a voltage regulation strategy command, and each transformer substation executes the voltage regulation strategy command, otherwise, the step S1 is returned;
in this embodiment, the value at any time when the bus voltage is atUSatisfies the following conditions: 10.1 is less than or equal toUWhen the concentration is less than or equal to 10.6, the second stepiThe voltage of the bar bus is not out of limit, otherwise, the firstiThe voltage of the bar bus is out of limit; if it is firstiIf the voltage of the bar bus is not out of limit, the bar bus indicates the firstiThe voltage of the strip bus is in a voltage operation range allowed by a system, namely, an AVC generated voltage regulation strategy is not caused, the problem that whether AVC voltage regulation is effective or not is avoided, the AVC still continuously monitors the condition of the bus voltage of each transformer substation in real time, when the AVC monitors that the voltage of the bus of the transformer substation is lower than 10.1kV or higher than 10.6kV in real time, the bus voltage is out of limit, and the AVC generates the voltage regulation strategy according to the actual operation condition under the normal condition, so that the out-of-limit bus voltage is recovered to the voltage operation range allowed by the system normally after the AVC voltage regulation.
In this embodiment, the voltage regulation strategy commands to trip the capacitor/reactor bank or to raise or lower the main transformer gear; when the AVC voltage regulation strategy command is to increase the gear of the main transformer, the numerical value of the gear of the main transformer is increased by 1, and when the AVC voltage regulation strategy command is to reduce the gear of the main transformer, the numerical value of the gear of the main transformer is decreased by 1.
S3, collecting the voltage regulated by a voltage regulation strategyiValue of bar bus voltageU 2Calculating AVC Voltage adjustment strategy before and after adjustmentiDifference value △ U of bar bus voltage, AVC voltage regulation strategy before and after regulationiThe difference △ U between the bar bus voltages is calculated as:
△U=U 2-U 1
wherein the content of the first and second substances,U 2for the first time after being regulated by AVC voltage regulation strategyiThe value of the bar bus voltage;U 1is as followsiInitial value of bar bus voltage;
s4, judging whether the absolute value of △ U is larger than a reference value, if so, executing a step S5, otherwise, locking the AVC to the fourth stepiVoltage regulation of the strip bus;
in this embodiment, when the AVC voltage adjustment policy command is to switch on/off the capacitor/reactor bank, the specific process of step S4 is:
s401, collecting △ Uq of bus voltage regulation sensitivity parameters of each transformer substation from a dispatching automation system database;
s402, calculating a voltage regulation reference value △ Uk when the capacitor/reactor group is switched on or off according to the bus voltage regulation sensitivity parameter △ Uq, wherein the calculation formula is as follows:
△Uk=C×△Uq×50%
wherein △ Uk represents the voltage regulation reference value when the capacitor/reactor group is switched on or off, C represents the capacity of the capacitor/reactor group;
s403, judging whether the voltage value of △ U is larger than the voltage regulation reference value △ Uk when the capacitor/reactor group is switched on or off, if so, executing the step S5, otherwise, AVC locks the second voltage valueiVoltage regulation of the strip bus;
in this embodiment, when the AVC voltage regulation strategy commands the main transformer gear shifting, the specific process of step S4 is:
s411, collecting gear voltage regulation sensitivity parameters △ Uu of the main transformer of each transformer substation from a scheduling automation system database;
s412, taking the main transformer gear voltage regulation sensitivity parameter △ Uu as a voltage regulation reference value when the main transformer gear is lifted;
s413, judging whether | △ U | is greater than △ Uu, if yes, executing the step S5, otherwise, locking the AVC to the fourth positioniAnd adjusting the voltage of the strip bus.
S5, judging whether the bus voltage change direction is consistent with the direction of the AVC voltage regulation strategy command or not according to the △ U size, if so, effectively regulating the AVC voltage, otherwise, locking the AVC to the firstiAnd adjusting the voltage of the strip bus.
When the AVC voltage regulation strategy command is a capacitor bank which is put into the capacitor/reactor bank, the bus voltage rises, if △ U is larger than 0, the direction of bus voltage change is consistent with the direction of the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC is lockediWhen the AVC voltage regulation strategy command is a reactor group for putting in a capacitor/reactor group, the bus voltage is reduced, if △ U is less than 0, the bus voltage change direction is consistent with the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC lock is the firstiWhen the AVC voltage regulation strategy command is a capacitor bank exiting the capacitor/reactor bank, the bus voltage is reduced, if △ U is less than 0, the bus voltage change direction is consistent with the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC lock is the firstiWhen the AVC voltage regulation strategy command is to exit the reactor group of the capacitor/reactor group, the bus voltage rises, if △ U is more than 0, the bus voltage change direction is consistent with the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC lock is the firstiAnd adjusting the voltage of the strip bus.
When the AVC voltage regulation strategy command is to increase the gear of the main transformer, the bus voltage is increased, if △ U is greater than 0, the direction of the bus voltage change is consistent with the direction of the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC is lockediWhen the AVC voltage regulation strategy command is to reduce the gear of the main transformer, the bus voltage is reduced, if △ U is less than 0, the direction of the bus voltage change is consistent with the direction of the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise,AVC latch firstiAnd adjusting the voltage of the strip bus.
In order to implement the method for judging the validity of voltage regulation based on AVC, an embodiment of the present invention further provides a system for judging the validity of voltage regulation based on AVC, where a structural connection block diagram of the system for judging the validity of voltage regulation based on AVC is shown in fig. 2, and referring to fig. 2, the system includes:
the dispatching automation system database 1 is used for receiving real-time substation operation data transmitted by a substation telecontrol transmission device and storing a bus voltage regulation sensitivity parameter △ Uq of each substation and a main transformer gear voltage regulation sensitivity parameter △ Uu;
AVC, marked as 2 in figure 2, acquiring real-time operation data of the transformer substation from a scheduling automation system database 1, monitoring the condition of bus voltage of each transformer substation in real time, generating a voltage regulation strategy command, judging whether the direction of the bus voltage change is consistent with the direction of the AVC voltage regulation strategy command, and generating a voltage regulation locking command;
the substation telecontrol transmission devices 3 transmit real-time operation data of the substations to the dispatching automation system database 1, and a voltage regulation strategy instruction execution unit 31 and a voltage regulation locking instruction execution unit 32 are arranged in any one of the substation telecontrol transmission devices 3 and are respectively used for executing a voltage regulation strategy instruction and a voltage regulation locking instruction issued by AVC; in the present embodiment, referring to fig. 2, there are 10 substation telemechanical transmission devices in total.
As shown in fig. 2, the AVC is provided with a voltage regulation policy instruction generation module 21, a voltage regulation locking instruction generation module 22, and a direction consistency determination module 23, the voltage regulation policy instruction generation module 21 generates a voltage regulation policy instruction, the voltage regulation policy instruction is transmitted to the voltage regulation policy instruction execution unit 31 and executed, the bus voltage of each substation changes, and the direction consistency determination module 23 determines whether the bus voltage change direction is consistent with the direction of the AVC voltage regulation policy instruction.
The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A voltage regulation effectiveness judgment method based on AVC is characterized by at least comprising the following steps:
s1, monitoring the condition of bus voltage of each transformer substation in real time through AVC to obtain the firstiInitial value of bar bus voltageU 1；
S2, judgingiIf the voltage of the strip bus is out of limit, AVC generates a voltage regulation strategy command, and each transformer substation executes the voltage regulation strategy command, otherwise, the step S1 is returned;
s3, collecting the voltage regulated by a voltage regulation strategyiValue of bar bus voltageU 2Calculating AVC Voltage adjustment strategy before and after adjustmentiDifference △ of bar bus voltageU；
S4, judging | △UIf | is greater than the reference value, if yes, execute step S5, otherwise, AVC locks the secondiVoltage regulation of the strip bus;
s5. according to △UJudging whether the bus voltage change direction is consistent with the direction of the AVC voltage regulation strategy command, if so, effectively regulating the AVC voltage; otherwise, AVC locks firstiAnd adjusting the voltage of the strip bus.
2. The AVC based voltage regulation validity determination method of claim 1, wherein said determination of step S2 isiThe method for judging whether the voltage of the bar bus is out of limit or not comprises the following steps: value at any moment of bus voltageUSatisfies the following conditions: 10.1 is less than or equal toUWhen the concentration is less than or equal to 10.6, the second stepiThe voltage of the bar bus is not out of limit, otherwise, the firstiOf bus barsThe voltage is out of limit.
3. The AVC based voltage regulation validity determination method of claim 2, wherein said voltage regulation strategy command is to trip capacitor/reactor bank or to raise or lower a main transformer gear; when the AVC voltage regulation strategy command is to increase the gear of the main transformer, the numerical value of the gear of the main transformer is increased by 1, and when the AVC voltage regulation strategy command is to reduce the gear of the main transformer, the numerical value of the gear of the main transformer is decreased by 1.
4. The AVC based voltage regulation validity determination method according to claim 3, wherein when the AVC voltage regulation policy command is to switch on/off the capacitor/reactor bank, the specific procedure of step S4 is:
s401, collecting △ Uq of bus voltage regulation sensitivity parameters of each transformer substation from a dispatching automation system database;
s402, calculating a voltage regulation reference value △ Uk when the capacitor/reactor group is switched on or off according to the bus voltage regulation sensitivity parameter △ Uq, wherein the calculation formula is as follows:
△Uk=C×△Uq×50%
wherein △ Uk represents the voltage regulation reference value when the capacitor/reactor group is switched on or off, C represents the capacity of the capacitor/reactor group;
s403, judging whether the voltage value of △ U is larger than the voltage regulation reference value △ Uk when the capacitor/reactor group is switched on or off, if so, executing the step S5, otherwise, AVC locks the second voltage valueiAnd adjusting the voltage of the strip bus.
5. The AVC based voltage regulation validity determination method of claim 4, wherein when the AVC voltage regulation strategy commands the raising and lowering of the main transformer gear, the specific process of step S4 is as follows:
s411, collecting gear voltage regulation sensitivity parameters △ Uu of the main transformer of each transformer substation from a scheduling automation system database;
s412, taking the main transformer gear voltage regulation sensitivity parameter △ Uu as a voltage regulation reference value when the main transformer gear is lifted;
s413, judging whether | △ U | is greater than △ Uu, if yes, executing the step S5, otherwise, locking the AVC to the fourth positioniAnd adjusting the voltage of the strip bus.
6. The AVC based voltage regulation validity determination method of claim 1, wherein the AVC voltage regulation strategy is the first before and after regulationiThe difference △ U between the bar bus voltages is calculated as:
△U=U 2-U 1
wherein the content of the first and second substances,U 2for the first time after being regulated by AVC voltage regulation strategyiThe value of the bar bus voltage;U 1is as followsiInitial value of bar bus voltage.
7. A method for judging the validity of AVC based voltage regulation according to any one of claims 3-5, characterized in that when the AVC voltage regulation strategy command is to put in a capacitor bank of a capacitor/reactor bank, the bus voltage rises, and if △ U is greater than 0, the direction of change of the bus voltage is the same as the direction of the AVC voltage regulation strategy command, the AVC voltage regulation is valid, otherwise, the AVC locks the second AVC blockiWhen the AVC voltage regulation strategy command is a reactor group for putting in a capacitor/reactor group, the bus voltage is reduced, if △ U is less than 0, the bus voltage change direction is consistent with the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC lock is the firstiWhen the AVC voltage regulation strategy command is a capacitor bank exiting the capacitor/reactor bank, the bus voltage is reduced, if △ U is less than 0, the bus voltage change direction is consistent with the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC lock is the firstiVoltage regulation of the strip bus; when the AVC voltage regulation strategy dictates to exit the reactor bank of the capacitor/reactor bank, the bus voltage is raised if△ U is greater than 0, the bus voltage change direction is consistent with the AVC voltage regulation strategy command direction, AVC voltage regulation is effective, otherwise, AVC is locked to the secondiAnd adjusting the voltage of the strip bus.
8. A method for judging the validity of AVC based voltage regulation according to any one of claims 3-5, characterized in that when the AVC voltage regulation strategy commands to raise the main transformer gear, the bus voltage is raised, if △ U is greater than 0, the direction of bus voltage change is consistent with the direction of AVC voltage regulation strategy command, the AVC voltage regulation is valid, otherwise, AVC is locked for the second timeiWhen the AVC voltage regulation strategy command is to reduce the gear of the main transformer, the bus voltage is reduced, if △ U is less than 0, the direction of the bus voltage change is consistent with the direction of the AVC voltage regulation strategy command, the AVC voltage regulation is effective, otherwise, the AVC is locked for the first timeiAnd adjusting the voltage of the strip bus.
9. An AVC-based voltage regulation validity determination system for implementing the AVC-based voltage regulation validity determination method of claim 5, comprising:
the dispatching automation system database is used for receiving real-time operation data of the transformer substation transmitted by the transformer substation telemechanical transmission device and storing a bus voltage regulation sensitivity parameter △ Uq of each transformer substation and a main transformer gear voltage regulation sensitivity parameter △ Uu;
AVC, acquiring real-time operation data of the transformer substation from a dispatching automation system database, monitoring the condition of bus voltage of each transformer substation in real time, generating a voltage regulation strategy command, judging whether the bus voltage change direction is consistent with the direction of the AVC voltage regulation strategy command or not, and generating a voltage regulation locking command;
the substation telecontrol transmission devices transmit real-time operation data of the substations to a dispatching automation system database, and a voltage regulation strategy instruction execution unit and a voltage regulation locking instruction execution unit are arranged in any one of the substation telecontrol transmission devices and are respectively used for executing a voltage regulation strategy instruction and a voltage regulation locking instruction issued by AVC.
10. The AVC-based voltage regulation validity determination system according to claim 9, wherein a voltage regulation policy instruction generation module, a voltage regulation locking instruction generation module, and a direction consistency determination module are provided in the AVC, the voltage regulation policy instruction generation module generates a voltage regulation policy instruction, the voltage regulation policy instruction is transmitted to the voltage regulation policy instruction execution unit and executed, the bus voltage of each substation changes, and the direction consistency determination module determines whether the bus voltage change direction is consistent with the direction of the AVC voltage regulation policy instruction.
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