CN112769123B - Actual measurement method and device for source-network-load accurate control system - Google Patents
Actual measurement method and device for source-network-load accurate control system Download PDFInfo
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- CN112769123B CN112769123B CN201911060434.XA CN201911060434A CN112769123B CN 112769123 B CN112769123 B CN 112769123B CN 201911060434 A CN201911060434 A CN 201911060434A CN 112769123 B CN112769123 B CN 112769123B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention discloses a method and a device for counting actual cut of a source-network-load accurate control system. The method comprises the following steps: in a fixed time window from the moment of receiving the control command, according to the final selection result of the control command, bringing the selected cutting object which is put into operation before receiving the command into the actual cutting amount statistical range; monitoring the running information of the control object, judging the switching-in and switching-off state of each selected and switched object in real time, if the state is the switching-off state, judging that the selected and switched object is actually cut off, otherwise, judging that the selected and switched object is not actually cut off; and taking the power before receiving the command of the real-cut object as the real-cut quantity of the object, and accumulating to obtain the total real-cut quantity of the system. According to the technical scheme, when the system fails and the cut object is selected, the actual cut state of the selected cut object is judged, only the power of the actually cut object before receiving the command is taken as the actual cut amount to be counted, and the accuracy of counting the actual cut amount is improved.
Description
Technical Field
The invention belongs to the field of power system automation, and particularly relates to a method and a device for counting actual output of a source-grid-load accurate control system in a power system.
Background
Along with continuous construction of large-capacity long-distance ultrahigh-voltage power transmission, centralized access of a large amount of new energy, gradual maturity of an electric power market mechanism and the like, the scale of an electric power system is continuously enlarged, the operation characteristics are complex and changeable, the stability problem of the electric power system is more prominent than the prior art, controllable resources of a power grid are continuously excavated and expanded, interaction scenes among power supplies, the power grid and loads are gradually increased, and therefore the source grid load accurate control system for ensuring safe and reliable operation of the electric power system is gradually popularized and applied.
In the current stage, research of a source network load accurate control system mainly focuses on the accuracy of control measures and does not pay more attention to the evaluation of actual cut-off after an accident, and a currently used statistical real-cut method mainly uses the sum of power before the fault of all controlled objects minus the sum of real-time power, and uses a power difference value as the actual cut-off. The method has the main problems that:
(1) the statistical range is all control objects, the selected cutting object and the unselected cutting object are not distinguished, and the normal power fluctuation of the unselected cutting object is counted into the actual cutting amount, so that the statistical precision is influenced;
(2) after the control object is actually cut off, a zero drift error exists in the sampling of the device, and the error is counted into the actual cut quantity, so that the counting precision is influenced.
The measurement error introduced by the statistical method is large, so that the actual cutting amount of statistics is not accurate, and the analysis after an accident is not facilitated.
Disclosure of Invention
The invention aims to provide a method and a device for counting actual cut quantity of a source-network-load accurate control system.
In order to achieve the above purpose, the solution of the invention is:
a method for counting actual measurement of a source-network-load accurate control system comprises the following steps:
step 1, in a fixed time window from the moment when a control command is received, according to the final selection result of the control command, bringing a selected cutting object which is put into operation before the command is received into a real cutting amount statistical range;
step 2, monitoring the running information of the control object, and judging the switching state of each selected and switched object in real time; in a fixed time window from the moment of receiving the control command, if the selected and cut object is in an off state, judging that the selected and cut object is actually cut off, otherwise, judging that the selected and cut object is not actually cut off;
and 3, taking the power before receiving the command of the actual cut object as the real cut amount of the object, and accumulating the real cut amounts of all the objects to obtain the total real cut amount of the system.
In the step 1, within a fixed time window from the moment when the control command is received, if multiple selective cutting commands of multiple systems are received, all generated selective cutting objects are brought into the actual cutting quantity statistical range.
In the step 2, when the selected and cut object is judged to be in the shutdown state, the condition for judging the shutdown state is any one of or a combination of at least two of the following conditions:
firstly, setting the real-time current of a cut object as Ik, setting the operation current constant value of the cut object as Irun _ k, and judging the cut object to be in a shutdown state when the Ik is smaller than the Irun _ k and meets the confirmation delay TI _ k;
secondly, setting the real-time power of the cut object as Pk, setting the operation power fixed value of the cut object as run _ k, and judging the cut object as a shutdown state when Pk is smaller than run _ k and meets the confirmation delay TP _ k;
thirdly, if the switching-on position signal of the cut object is 0 or the tripping position signal is 1 and the confirmation delay TW _ k is met, the cut object is judged to be in a shutdown state;
fourthly, if the switching-on position signal of the cut object is changed from 1 to 0 or the tripping position signal is changed from 0 to 1, the operation stop state is judged.
In the step 3, the power before receiving the command of the actual cut-off object adopts the steady state quantity which can represent the system before the fault occurs, and the power does not change in real time in the fixed time window from the moment when the control command is received.
A device for counting actual cut of a source-network-load accurate control system comprises:
the real cut amount statistical range determining module is used for enabling a selected cut object which is put into operation before the command is received to be brought into a real cut amount statistical range in a fixed time window starting at the moment when the control command is received according to a final selection result of the control command;
the judgment object real-time switching state module is used for monitoring the running information of the control object and judging the switching state of each selected switching object in real time; in a fixed time window from the moment of receiving the control command, if the state of the selected cut object is off, the selected cut object is judged to be actually cut off, otherwise, the selected cut object is judged not to be actually cut off; and (c) a second step of,
and the total actual cutting quantity counting module is used for taking the power before receiving the command of the actually cut object as the actual cutting quantity of the object and accumulating all the actual cutting quantities to obtain the total actual cutting quantity of the system.
The above-mentioned real-cut quantity statistical range determining module brings all the selection-cutting objects generated by receiving multiple selection-cutting commands of multiple systems into the real-cut quantity statistical range within a given time window from the moment of receiving the command.
When the judgment object actual-cut state module judges the switching-in and switching-off states of the selected and cut objects, according to the actual situation, if any one of the following conditions is met, or any two, even any three or four conditions need to be met, the judgment object actual-cut state module judges the switching-off state as the switching-off state:
firstly, according to the current information of the cut object, if the real-time current Ik of the cut object is smaller than the fixed value Irun _ k of the operation current of the cut object and meets the confirmation delay TI _ k, the cut object is judged to be in a shutdown state;
secondly, setting the real-time power Pk of the cut object to be smaller than the operation power fixed value of the cut object as run _ k according to the active power information of the cut object, satisfying the confirmation delay TP _ k, and judging as an outage state;
thirdly, according to the switch position information of the cut object, if the switching-on position signal of the cut object is 0 or the tripping position signal is 1 and meets the confirmation delay TW _ k, the cut object is judged to be in a shutdown state;
fourthly, according to the switch position displacement information of the cut object, if the switching-on position signal of the cut object is changed from 1 to 0 or the tripping position signal is changed from 0 to 1, the cut object is judged to be in the shutdown state.
The total actual switching value counting module adopts data which can represent the steady state value of the system before the system fails and the power of the system does not change in real time in a fixed time window from the moment of receiving the command as the power before the command is received by the actual switching object.
After the scheme is adopted, the invention has the beneficial effects that: when the power system fails and the load or the unit is selected and switched, the actual switching value precision of the statistical load or the unit is improved.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The invention provides a method for counting actual cut of a source-network-load accurate control system, which is described below by taking specific embodiments in conjunction with the accompanying drawings in order to better understand the technical content of the invention.
As shown in fig. 1, the scheme of the present invention comprises the following steps: (1) determining a real cutting amount statistical range link, and (2) judging a target real cutting state link; (3) and (5) counting the total actual cutting quantity.
Assuming that a certain source load control system has 7 switchable objects, a certain fault command selects the first 6 objects, the power of each switchable object before receiving the command is Pkq1_, Pkq2_, Pkq3_, Pkq4_, Pkq5_, Pkq6_, Pkq7_, and after actually executing the switch-off command:
object 1: the real-time power is smaller than the operation power and meets the time delay, the real-time power has a measurement error and is set as delta P1;
object 2: the real-time current is smaller than the operation current and meets the time delay, the real-time power has a measurement error and is set as delta P2;
object 3: the tripping position signal is 1, time delay is met, a real-time power has a measurement error, and the measurement error is set to be delta P3;
object 4: the switching-on position signal is changed from 1 to 0, the real-time power has a measurement error and is set as delta P4;
object 5: the real-time power is greater than the operation power, the real-time current is greater than the operation current, the tripping position signal is 0 and does not shift, the switching-on position signal is 1 and does not shift, the real-time power has a measurement error and is set to be Pkq5_ +. DELTA P5;
object 6: before receiving the command, the object is in a shutdown state, the real-time power has a measurement error and is set to be Pkq6_ +/-delta P6;
object 7: the real-time power has measurement error and is set to Pkq7_ +. DELTA P7;
(1) according to the control command selection result, bringing the selected and cut objects which are put into operation before receiving the command into the actual cut quantity statistical range, and determining the actual cut quantity statistical range to be an object 1, an object 2, an object 3, an object 4 and an object 5;
(2) judging the real cutting state link of the object:
object 1: in the selection and switching range, putting into operation before receiving the command, stopping operation after receiving the command, and judging that the command is actually cut off;
object 2: in the selection and switching range, putting into operation before receiving the command, stopping operation after receiving the command, and judging that the command is actually cut off;
object 3: in the selection range, the operation is carried out before receiving the command, and the operation is stopped after receiving the command, so that the operation is judged to be actually cut off;
object 4: in the selection and switching range, putting into operation before receiving the command, stopping operation after receiving the command, and judging that the command is actually cut off;
object 5: in the selection range, putting into operation before receiving the command, and putting into operation after receiving the command, and judging that the command is not actually cut off;
(3) accumulating the actual cutting amount of the selected cutting object to obtain the total actual cutting amount:
subject 1 true cut Pcut1 ═ Pkq1 —;
subject 2 true cut Pcut2 ═ Pkq2 —;
subject 3 actual cut Pcut3 ═ Pkq3 _;
subject 4 actual cut Pcut4 ═ Pkq4 _;
object 5 true cut Pcut5 ═ 0;
and (4) accumulating to obtain a total true cut:
Pcut_total＝
Pcut1+Pcut2+Pcut3+Pcut4+Pcut5＝Pkq1_+Pkq2_+Pkq3_+Pkq4_+Pkq5_
if according to the conventional statistical method, the real-time power sum subtracted from the sum of the powers of all the objects before the command is received is counted to obtain the real-time tangent quantity:
Pcut_total＝Pkq1_+Pkq2_+Pkq3_+Pkq4_+Pkq5_+Pkq6_+Pkq7_
-(△P1+△P2+△P3+△P4+△P5+Pkq6_+△P6+Pkq7_+△P7)
＝Pkq1_+Pkq2_+Pkq3_+Pkq4_+Pkq5_
-(△P1+△P2+△P3+△P4+△P5+△P6+△P7)
the accurate source network load control system adopted by the invention counts the actual tangent method and does not contain a measurement error part.
In conclusion, through the implementation of the scheme, when the power system breaks down and the actual load of the generator tripping operation needs to be counted, the counting precision is improved, and errors caused by sampling can be effectively avoided.
The invention also provides a device for accurately controlling the system to count the actual cutting amount of the source network load, which comprises the following components: a module for determining the real cutting amount statistical range, a module for judging the real cutting state of an object and a module for counting the total real cutting amount, wherein,
the actual cutting amount statistical range determining module is used for: and the device brings the selected cutting object which is put into operation before receiving the command into the actual cutting amount statistical range according to the final selection result of the control command in a fixed time window from the moment of receiving the control command.
The real-time switching state judging module: monitoring the running information of the control object, and judging the switching state of each selected and switched object in real time; and in a fixed time window from the moment of receiving the control command, if the selected and cut object is in an off state, judging that the selected and cut object is actually cut off, otherwise, judging that the selected and cut object is not actually cut off.
The total actual tangent counting module is as follows: and taking the power before receiving the command of the actual cut object as the real cut amount of the object, and accumulating all the real cut amounts to obtain the total real cut amount of the system.
In this embodiment, in the module for determining the statistical range of the actual cut amount, multiple selective cutting commands of multiple systems are received within a given time window from the moment of receiving the command, and all generated selective cutting objects are included in the statistical range of the actual cut amount.
In this embodiment, the determination object real-cut state module determines the operation/stop state of the cut object within the statistical real-cut amount range, and may set the real-time current Ik of the cut object by using the current information of the cut object, where the operation current constant value of the cut object is Irun _ k, and when Ik is smaller than Irun _ k and satisfies the confirmation delay TI _ k, the cut object real-cut state module determines the operation/stop state.
In this embodiment, in the module for determining the actual cutting state of the object, the switching state of the cut object within the statistical actual cutting amount range is determined, the real-time power Pk of the cut object is set by using the active power information of the cut object, the fixed value of the operational power of the cut object is Prun _ k, and the switching state is determined when Pk is less than Prun _ k and satisfies the acknowledgement delay TP _ k.
In this embodiment, the determination target actual-cut state module determines the on-off state of the cut target within the statistical actual-cut amount range, and determines the off state when the on-position signal of the cut target is 0 or the trip position signal is 1 and the confirmation delay TW — k is satisfied, using the switch position information of the cut target.
In this embodiment, in the determination object actual switching state module, the switching-off state of the switched object within the statistical actual switching range is determined, and when the switching-on position signal of the switched object changes from 1 to 0 or the tripping position signal changes from 0 to 1, the switching-off state is determined by using the switch position displacement information of the switched object.
In this embodiment, in the total actual cut statistic module, the power before receiving a command of the actual cut object is a steady-state quantity that can represent the system before a fault occurs, and the power does not change in real time within a fixed time window from the moment of receiving the command.
The above embodiments are only for illustrating the technical idea of the present invention, and the technical idea of the present invention is not limited thereto, and any modifications made on the basis of the technical solution according to the technical idea of the present invention fall within the protective scope of the present invention.
Claims (8)
1. A method for counting actual measurement of a source-network-load accurate control system is characterized by comprising the following steps:
step 1, in a fixed time window from the moment when a control command is received, according to the final selection result of the control command, bringing a selected cutting object which is in operation before the control command is received into the actual cutting amount statistical range;
step 2, monitoring the running information of the control object, and judging the switching state of each selected and switched object in real time; in a fixed time window from the moment of receiving the control command, if the state of the selected cut object is off, the selected cut object is judged to be actually cut off, otherwise, the selected cut object is judged not to be actually cut off;
and 3, taking the power before receiving the command of the actual cut object as the real cut amount of the object, and accumulating the real cut amounts of all the objects to obtain the total real cut amount of the system.
2. The method for accurately controlling the statistical realism of the system for accurately controlling the source network loads according to claim 1, wherein the method comprises the following steps: in the step 1, within a fixed time window from the moment when the control command is received, if multiple selective cutting commands of multiple systems are received, all generated selective cutting objects are in the actual cutting amount statistical range.
3. The method for accurately controlling the statistical tangential quantity of the source-network loads according to claim 1, characterized in that: in the step 2, when the selected and cut object is judged to be in the shutdown state, the condition for judging the shutdown state is any one of or a combination of at least two of the following conditions:
firstly, setting the real-time current of a cut object as Ik, setting the operation current constant value of the cut object as Irun _ k, and judging the cut object to be in a shutdown state when the Ik is smaller than the Irun _ k and meets the confirmation delay TI _ k;
secondly, setting the real-time power of the cut object as Pk, setting the operation power fixed value of the cut object as run _ k, and judging the cut object as a shutdown state when Pk is smaller than run _ k and meets the confirmation delay TP _ k;
thirdly, if the switching-on position signal of the cut object is 0 or the tripping position signal is 1 and the confirmation delay TW _ k is met, the cut object is judged to be in a shutdown state;
fourthly, if the switching-on position signal of the cut object is changed from 1 to 0 or the tripping position signal is changed from 0 to 1, the operation is judged to be in the shutdown state.
4. The method for accurately controlling the statistical realism of the system for accurately controlling the source network loads according to claim 1, wherein the method comprises the following steps: in the step 3, the power before receiving the command of the actual cut-off object adopts a steady-state quantity which can represent the system before the fault occurs, and the power does not change in real time in a fixed time window from the moment when the control command is received.
5. The utility model provides a net accurate control system of source load statistics is surely worth device which characterized in that includes:
the real cut amount statistical range determining module is used for enabling a selected cut object which is put into operation before the command is received to be brought into a real cut amount statistical range in a fixed time window starting at the moment when the control command is received according to a final selection result of the control command;
the real-time switching state judgment module is used for monitoring the running information of the control object and judging the switching state of each selected switching object in real time; in a fixed time window from the moment of receiving the control command, if the state of the selected cut object is off, the selected cut object is judged to be actually cut off, otherwise, the selected cut object is judged not to be actually cut off; and the number of the first and second groups,
and the total real cut quantity counting module is used for taking the power before receiving the command of the actually cut object as the real cut quantity of the object and accumulating all the real cut quantities to obtain the total real cut quantity of the system.
6. The device for accurately counting the actual cut-off quantity of the source-network-load control system as claimed in claim 5, characterized in that: and the real cut quantity statistical range determining module is used for bringing selected and cut objects generated by receiving multiple selected and cut commands of a plurality of systems into the real cut quantity statistical range in a fixed time window starting at the command receiving moment.
7. The device for accurately counting the actual cut-off quantity of the source-network-load control system as claimed in claim 5, characterized in that: when the judgment object actual cutting state module judges the switching-in and switching-off states of all the selected cutting objects, if any one of the following conditions or the combination of at least two conditions is met, the judgment object actual cutting state module judges that the selected cutting objects are in the off state:
firstly, according to the current information of the cut object, if the real-time current Ik of the cut object is smaller than the fixed value Irun _ k of the operation current of the cut object and meets the confirmation delay TI _ k, the cut object is judged to be in the shutdown state;
secondly, setting the real-time power Pk of the cut object to be smaller than the operation power fixed value of the cut object as run _ k according to the active power information of the cut object, satisfying the confirmation delay TP _ k, and judging as an outage state;
thirdly, according to the switch position information of the cut object, if the switching-on position signal of the cut object is 0 or the tripping position signal is 1 and meets the confirmation delay TW _ k, the cut object is judged to be in the shutdown state;
fourthly, according to the switch position displacement information of the cut object, if the switching-on position signal of the cut object is changed from 1 to 0 or the tripping position signal is changed from 0 to 1, the cut object is judged to be in the shutdown state.
8. The device for accurately controlling the net load statistics of the actual measurement according to claim 5, wherein: the total real-time switching value counting module adopts data which can represent the steady-state value of the system before the system fails and the power of the system does not change in real time in a fixed time window from the moment of receiving the command as the power of the real-time switching object before receiving the command.
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