CN106684867B - Real-time line loss calculation method, device and equipment based on distribution network switch state change - Google Patents
Real-time line loss calculation method, device and equipment based on distribution network switch state change Download PDFInfo
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- H—ELECTRICITY
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Abstract
The embodiment of the invention discloses a real-time line loss calculation method, a real-time line loss calculation device and a real-time line loss calculation equipment based on distribution network switch state change. The method comprises the following steps: s101, acquiring a CIM topological model of a feeder line, real-time state information of a switch corresponding to the feeder line, the supply and output electric quantity of a feeder line transformer substation and the supply electric quantity of a transformer; s102, analyzing the CIM topological model to obtain all paths corresponding to the feeder line and switches contained in all the paths; s103, obtaining power supply relation change information of all paths based on the real-time state information of the switch; and S104, determining the real-time line loss of the feeder line according to the supply and output electricity quantity of the feeder line transformer substation, the supply electricity quantity of the transformer and the change information of the power supply relation of all paths. The technical scheme provided by the embodiment of the invention saves the storage cost of data, eliminates the influence of the switching of the distribution lines on the line loss determination, thereby realizing the high-accuracy determination of the line loss and improving the management level of the line loss.
Description
Technical Field
The embodiment of the invention relates to real-time line loss determinations, in particular to real-time line loss calculation methods, devices and equipment based on distribution network switch state changes.
Background
The line loss refers to the energy loss emitted in the form of heat energy, namely the active power consumed by resistance and conductance, which is important economic indexes in a power grid system, the line loss management work is an important ring in power consumption management, which influences the reliability of power consumption of users and the economic benefit of power supply enterprises, the line loss management is enhanced, the energy can be saved, the cost of electric energy production and transmission can be reduced, and the sustainable and coordinated development of national economy is promoted.
In order to improve the reliability of power supply, a user can obtain power supplies from multiple directions and guarantee the continuous supply of electric power, many power distribution networks usually adopt a ring network power supply mode.
In order to accurately determine the line loss, the real-time topological relation of the power grid in the power supply process must be analyzed. However, in the conventional network topology analysis method, bus numbers are allocated to all nodes, and when the switch state changes, the bus numbers are searched again in each plant and numbered again. This method of searching a large area using a stack technique for the purpose of local network state change is time-consuming and difficult to support real-time line loss determination.
Disclosure of Invention
The embodiment of the invention provides real-time line loss calculation methods, devices and equipment based on distribution network switch state changes, so as to realize real-time line loss determination and improve the efficiency and the precision of line loss determination.
, the embodiment of the present invention provides real-time line loss calculation methods based on distribution network switch state changes, including:
s101, acquiring a CIM topological model of a feeder line, real-time state information of a switch corresponding to the feeder line, the supply and output electric quantity of a feeder line transformer substation and the supply electric quantity of a transformer;
s102, analyzing the CIM topological model to obtain all paths corresponding to the feeder line and switches contained in all the paths;
s103, obtaining power supply relation change information of all paths based on the real-time state information of the switch;
and S104, determining the real-time line loss of the feeder line according to the supply and output electricity quantity of the feeder line transformer substation, the supply electricity quantity of the transformer and the change information of the power supply relation of all paths.
In another aspect, an embodiment of the present invention provides real-time line loss calculating apparatuses based on distribution network switch state changes, including:
the data acquisition module is used for acquiring a CIM topological model of the feeder line, real-time state information of a switch corresponding to the feeder line, the supply and output electric quantity of the feeder line transformer substation and the supply electric quantity of the transformer;
the model analysis module is used for analyzing the CIM topological model to obtain all paths corresponding to the feeder line and switches contained in all the paths;
the power supply relation determining module is used for obtaining power supply relation change information of all paths based on the real-time state information of the switch;
and the line loss determining module is used for determining the real-time line loss of the feeder line according to the supply and output electric quantity of the feeder line transformer substation, the supply electric quantity of the transformer and the power supply relation change information of all paths.
In another aspect, embodiments of the present invention further provide kinds of devices, including:
or more processors;
a storage device for storing or more programs,
when the programs are executed by the processor or processors, the processor or processors implement the methods of embodiments of the invention.
According to the technical scheme provided by the embodiment of the invention, the static topological relation of the power grid is obtained by analyzing the CIM topological model of the feeder line, the effective access time of the distribution network line is judged and determined according to the real-time state of the switch, and finally, the time-sharing distribution of the power output amount of the feeder line power supply is realized according to the change of the power supply relation of the feeder line, and the real-time line loss is determined. By using the high-efficiency power distribution network topology analysis method, the storage cost of data is saved, and the influence of the switching of the power distribution lines on the line loss determination is eliminated, so that the line loss is determined with high accuracy, and the line loss management level is improved.
Drawings
Fig. 1 is a flowchart of a real-time line loss calculation method based on distribution network switch state change according to an embodiment of the present invention;
fig. 2 is a flowchart of feeder line real-time power supply condition determination provided in the embodiment of the present invention;
fig. 3 is a structural diagram of a real-time line loss calculation apparatus based on a distribution network switch state change according to an embodiment of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the drawings and examples, it being understood that the specific embodiments herein described are merely illustrative of and not restrictive on the broad invention, and it should be further noted that for the purposes of description, only some, but not all, of the structures associated with the present invention are shown in the drawings.
Fig. 1 is a flowchart of a real-time line loss calculation method based on distribution network switch state change according to an embodiment of the present invention. The method of the embodiment can be executed by a real-time line loss calculation device based on the state change of the distribution network switch, and the device can be realized in a software mode and can be loaded in terminal equipment. Referring to fig. 1, the method for calculating a real-time line loss based on a change in a switching state of a distribution network according to this embodiment may include the following steps:
s101, obtaining a CIM topological model of a feeder line, real-time state information of a switch corresponding to the feeder line, the supply and output electric quantity of a feeder line transformer substation and the supply electric quantity of a transformer.
Specifically, a CIM (Common Information Model) topology Model of a feeder included in the power network is obtained from each GIS (Geographic Information System) platform, and a preferred feeder is a feeder of a power supply unit 10 kV. And moreover, a real-time state file of the switch, the supply and output electricity quantity of the feeder line transformer substation and the supply and output electricity quantity of the transformer are obtained from the distribution network automation system.
Considering that the GIS system has a network topology analysis function determined by , the distribution network model based on the geometric network can combine the GIS and the distribution network topology, can optimize the distribution network topology analysis by using the topology of the GIS system, and also saves the previous complicated process of manually inputting the original connection relation which is easy to make mistakes, so that the subsequent S102 can analyze the static topology relation of the power network by using the model file of the GIS platform.
And S102, analyzing the CIM topological model to obtain all paths corresponding to the feeder line and switches contained in all paths.
Specifically, the description information of each feeder line in the CIM topology model is analyzed to obtain a static power grid topology relationship, and specifically, all paths corresponding to each feeder line and switches included in each path are obtained for each feeder line.
Referring to fig. 2, S102 may include:
s102-1, obtaining a description file corresponding to the CIM topological model of the feeder line.
Specifically, the description file may be an XML (eXtensible Markup Language) file, where the description file may correspond to feed lines, and description files may also include description information of multiple feed lines.
S102-2, matching in the description file according to the naming rule of the feeder substation, and determining the feeder substation.
Because the naming rule of the feeder transformer substation in the CIM topological model is that ID is CIRCUIT rdf, the keyword is searched in the description file, and the serial number of the feeder transformer is determined.
S102-3, finding the description file to determine an outgoing switch of the feeder line transformer substation, and traversing two paths where two ports of the outgoing switch are located respectively.
Specifically, an outgoing line switch of the feeder line transformer substation, namely th switches corresponding to the feeder line transformer substation, is obtained by searching a keyword "circuit.sourcebreaker" in a description file, the number of the switches is recorded, and the value of the number of the switches is 1. two ports of the outgoing line switch are found by searching the keyword "terminal.connection equipment" in the description file, and the recorded number of the feeder line transformer and the recorded number of the switches are copied to obtain two paths where the two ports are located.
S102-4, determining whether the setting control exists in each path, and determining the path and the switch in the path according to the determination result.
The setting control comprises a setting type switch, a transformer winding (transformerwining) and an alternating current segment (ac line segment), and the setting type switch comprises a Breaker (Breaker), a load switch (loadbreaker) and a disconnecting switch (Disconnector).
Specifically, in the process of traversing two paths where two ports are located, other controls with the same attribute are found by searching a keyword 'terminal. connectivity node', and whether a set control exists in the other controls is determined, if no set control exists in any path, the path is a dead path, the path is ended, and corresponding records are eliminated, if m (m > -1) set controls exist in any other controls, the records of the path are copied for m-1 times, and the following operations are executed, wherein if the set control is a switch with a set type, a switch k +1 is recorded, the number of the switch is recorded, if the set control is an alternating current segment, traversal operation is continued from another ports of the alternating current segment, if the set control is a transformer winding, the transformer winding is used as an end point of the corresponding path, the path number is recorded, and traversal of the path is ended.
S102-5, when traversing of every paths is finished, if the end point is a transformer winding, recording feeder line identification, transformer identification, switch identification and switch state corresponding to the path.
And S102-6, storing all paths and the switches contained in the paths in a linear index mode.
Illustratively, when all paths and the switches included in each path are stored in the form of linear indexes, feeder substations and transformers in the paths are stored in the same tables, the switches are stored in another tables, and the two tables are related by the linear indexes.
For example, the feeder substation and transformer information in the path is stored in table a, the switches are stored in table B, and a linear index is established to connect the two, where n in the table refers to the total number of changes in the state of the switches.
The format of table a is as follows (only the first three columns have data at present):
the format of table B is as follows (only the first two columns currently have data):
in each path, a head node (feeder substation) and a tail node (transformer) are only , and intermediate controls (switches) are indefinite, so that the path length is not , and if a sequential storage method is adopted for direct path division recording, a large amount of space is not stored, so that space is wasted.
And S103, obtaining power supply relation change information of all paths based on the real-time state information of the switch.
Specifically, based on the real-time state information of the switch acquired in S101, connectivity of a path from each feeder to the transformer is determined, and a condition and time of a change in a power supply relationship of the path are determined according to the connectivity.
Illustratively, S103 may include:
s103-1, determining the real-time states of the switches contained in all paths according to the acquired real-time state information of the switches.
Referring to fig. 2, for each path, the switch real-time status data obtained in S101 is filled into the corresponding status entry in table B at each time point, and then the ID of the path is obtained from table a, and the ID of the path is looked up in table B, so as to obtain all the switches on the path and their real-time statuses.
S103-2, determining the real-time communication state of each path according to the real-time states of all the switches in each path.
For example, referring to fig. 2, the states of all the switches at each time point are subjected to logical and operation, and the calculation result is added to the state of the corresponding position of the path in table a. if the result is 1, it indicates that all the switches on the path are in a closed state, the path is on at this time, and if the result is 0, the path is off.
S103-3, if the real-time connection state of the path to any is detected to be different from the last real-time connection states, determining the power supply relation change of the path, and recording the real-time and the state.
Referring to fig. 2, specifically, if at any time point, the real-time connection state of any path is detected to be different from the upper real-time connection states of the path (for example, the upper real-time connection states are connected, the real-time connection state detected at the time point is disconnected, or the upper real-time connection states are disconnected, and the real-time connection state detected at the time point is connected), it is determined that the power supply relationship change occurs in the path at the time point, and the time point and the corresponding state of the path are recorded.
It should be noted that if any time point is the initial operating time point, the power supply relationship of each path is recorded, that is, the state corresponding to the initial operating time point is filled in the state 0 column of table B, and so on, if the current real-time state data is added to the column of "state K", then the current real-time state data is added to the column of "state K% (n-1)" times, where n is not less than 2, and considering that there may be a delay in the actual calculation speed, n may be increased appropriately to store the states at a plurality of times.
Specifically, for example, at the th time point, the th time period state corresponds, so state 0 in table a is recorded in table C.
The format of table C is as follows:
and S104, determining the real-time line loss of the feeder line according to the supply and output electricity quantity of the feeder line transformer substation, the supply electricity quantity of the transformer and the change information of the power supply relation of all paths.
Specifically, the corresponding transformer electric quantity is apportioned and calculated according to the power supply relation change information of all paths of the feeder line, and the real-time line loss is calculated.
Illustratively, S104 may include:
s104-1, all paths corresponding to the feeder lines are obtained.
Specifically, for each feeders, all paths corresponding to the feeder are obtained from table a of S102.
And S104-2, determining the supply and discharge electric quantity of the feeder line transformer substation and the supply electric quantity of each transformer on each corresponding path in a target time period according to the supply and discharge electric quantity of the feeder line transformer substation and the supply electric quantity of each transformer.
Specifically, a certain time period (tt) is calculated for a certain feeder1To tt2) Calculating tt in combination with the electric quantity data acquired in S1011To tt2In the corresponding target time period, the supply and output electric quantity GC of the feeder line transformer substation and the supply electric quantity GR of each transformer on the path1、GR2、……、GRNAnd N is the total number of the converters on the path of the feeder line.
However, the interval of the electric quantity data which can be actually acquired is not but tt1To tt2Then, the electricity consumption may be calculated by using the section proportion, specifically as follows:
the period for determining the available supply and discharge amount of the substation is t1～t2And t2～t3And the time period of the substation is t2～t3The supplied and output electricity quantity is C2；
If t1<＝tt1<tt2<＝t2And then the feeder substation is in time slot (tt)1To tt2) The internal supply and output electricity GC is as follows:
if t1<＝tt1<t2<tt2<＝t3And then the feeder substation is in time slot (tt)1To tt2) The internal supply and output electricity GC is as follows:
by analogy, according to the interval of the actually obtained electric quantity data, the electric quantity GC supplied by the feeder line transformer substation in the target interval can be obtained.
And S104-3, determining the effective access time of the path where each transformer is located according to the power supply relation change information of the path corresponding to the feeder line.
Specifically, the real-time power supply conditions of the feeder lines corresponding to the paths in the table C are combined to respectively calculate the effective connection time T of the paths where the transformers and the feeder lines are located1、T2、……、TN。
S104-4, determining the line loss quantity of the feeder line according to the following formula:
wherein, GC is the supply and output electricity quantity of the feeder substation in the target time period, GRiThe power supply quantity of the ith transformer in the target time period is shown, N is the total number of the transformers corresponding to the feeder line, tt1Is the starting time point of the target time period, tt2Is the end time point of the target time period, TiThe effective path time of the path of the ith transformer.
According to the technical scheme provided by the embodiment of the invention, the static topological relation of the power grid is obtained by analyzing the CIM topological model of the feeder line, the effective access time of the distribution network line is judged and determined according to the real-time state of the switch, and finally, the time-sharing distribution of the power output amount of the feeder line power supply is realized according to the change of the power supply relation of the feeder line, and the real-time line loss is determined. By using the high-efficiency power distribution network topology analysis method, the storage cost of data is saved, and the influence of the switching of the power distribution lines on the line loss determination is eliminated, so that the line loss is determined with high accuracy, and the line loss management level is improved.
Fig. 3 is a structural diagram of the real-time line loss calculation apparatus based on the distribution network switch state change provided in the embodiment of the present invention, and as shown in fig. 3, the apparatus may include:
the data acquisition module 21 is configured to acquire a CIM topology model of a feeder line, real-time state information of a switch corresponding to the feeder line, supply and discharge electric quantities of a feeder line transformer substation, and supply and discharge electric quantities of a transformer;
the model analysis module 22 is used for analyzing the CIM topological model to obtain all paths corresponding to the feeder line and switches contained in each path;
the power supply relation determining module 23 is configured to obtain power supply relation change information of all paths based on the real-time state information of the switch;
and the line loss determining module 24 is used for determining the real-time line loss of the feeder line according to the supply and output electric quantity of the feeder line substation, the supply electric quantity of the transformer and the change information of the power supply relation of all paths.
Illustratively, the model parsing module 22 is specifically configured to:
obtaining a description file corresponding to a CIM topological model of a feeder line;
matching in the description file according to the naming rule of the feeder line transformer substation, and determining the feeder line transformer substation;
searching a description file to determine an outgoing switch of the feeder line transformer substation, and respectively traversing two paths where two ports of the outgoing switch are located;
determining whether a setting control exists in each path or not, and determining the paths and switches in the paths according to the determination result, wherein the setting control comprises a setting type switch, a transformer winding and an alternating current line section, and the setting type switch comprises a circuit breaker, a load switch and a disconnecting switch;
when traversing of every paths is finished, if the end point is a transformer winding, recording feeder line identification, transformer identification, switch identification and switch state corresponding to the path;
all paths and the switches included in each path are stored in the form of a linear index.
Illustratively, when all paths and the switches included in each path are stored in the form of linear indexes, feeder substations and transformers in the paths are stored in the same tables, the switches are stored in another tables, and the two tables are related by the linear indexes.
Illustratively, the power supply relationship determination module 23 is specifically configured to:
determining the real-time state of the switches contained in all paths according to the acquired real-time state information of the switches;
determining the real-time communication state of each path according to the real-time states of all switches in each path;
and if the real-time connection state of any path is detected to be different from the last real-time connection states, determining the power supply relation change of the path, and recording the real-time and the state.
Illustratively, the line loss determining module 24 may be specifically configured to:
acquiring all paths corresponding to the feeder lines;
according to the supply and output electric quantity of the feeder line transformer substation and the supply electric quantity of the transformer, the supply and output electric quantity of the feeder line transformer substation and the supply electric quantity of each transformer on each corresponding path in a target time period are determined;
determining effective access time of a path where each transformer is located according to the power supply relation change information of the path corresponding to the feeder line;
determining the line loss capacity of the feeder line according to the following formula:
wherein, GC is the supply and output electricity quantity of the feeder substation in the target time period, GRiThe power supply quantity of the ith transformer in the target time period is shown, N is the total number of the transformers corresponding to the feeder line, tt1Is the starting time point of the target time period, tt2Is the end time point of the target time period, TiThe effective path time of the path of the ith transformer.
The real-time line loss calculating device based on the distribution network switch state change provided by the embodiment of the invention and the real-time line loss calculating method provided by any embodiment of the invention belong to the same concept of , can execute the real-time line loss calculating method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects for executing the real-time line loss calculating method.
The embodiment of the invention also provides kinds of equipment, which can comprise:
or more processors;
a storage device for storing or more programs,
when the programs are executed by the processors, the processors implement the method for calculating the real-time line loss based on the distribution network switch state change according to any embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A real-time line loss calculation method based on distribution network switch state change is characterized by comprising the following steps:
s101, acquiring a CIM topological model of a feeder line, real-time state information of a switch corresponding to the feeder line, the supply and output electric quantity of a feeder line transformer substation and the supply electric quantity of a transformer;
s102, analyzing the CIM topological model to obtain all paths corresponding to the feeder line and switches contained in all the paths;
s103, obtaining power supply relation change information of all paths based on the real-time state information of the switch;
s104, determining real-time line loss of the feeder line according to the supply and output electricity quantity of the feeder line transformer substation, the supply electricity quantity of the transformer and the change information of the power supply relation of all paths;
s102 includes:
s102-1, obtaining a description file corresponding to a CIM topological model of a feeder line;
s102-2, matching in the description file according to naming rules of the feeder line transformer substation, and determining the feeder line transformer substation;
s102-3, searching the description file to determine an outgoing switch of the feeder line transformer substation, and traversing two paths where two ports of the outgoing switch are located respectively;
s102-4, determining whether setting controls exist in each path, and determining the paths and switches in the paths according to the determination results, wherein the setting controls comprise setting type switches, transformer windings and alternating current line sections, and the setting type switches comprise circuit breakers, load switches and isolating switches;
s102-5, when traversing of every paths is finished, if the end point is a transformer winding, recording feeder line identification, transformer identification, switch identification and switch states corresponding to the paths;
and S102-6, storing all paths and the switches contained in the paths in a linear index mode.
2. The method of claim 1, wherein when all paths and switches included in each path are stored by way of a linear index, feeder substations and transformers in the paths are stored in the same tables, switches are stored in another tables, and the two tables are related by way of the linear index.
3. The method of claim 1, wherein S103 comprises:
s103-1, determining the real-time states of the switches contained in all paths according to the acquired real-time state information of the switches;
s103-2, determining the real-time communication state of each path according to the real-time states of all switches in each path;
s103-3, if the real-time connection state of the path to any is detected to be different from the last real-time connection states, determining the power supply relation change of the path, and recording the real-time and the state.
4. The method of claim 1, wherein S104 comprises:
s104-1, acquiring all paths corresponding to the feeder lines;
s104-2, determining the supply and discharge electric quantity of the feeder line transformer substation and the supply electric quantity of each transformer on each corresponding path in a target time period according to the supply and discharge electric quantity of the feeder line transformer substation and the supply electric quantity of each transformer;
s104-3, determining effective access time of a path where each transformer is located according to power supply relation change information of the path corresponding to the feeder line;
s104-4, determining the line loss quantity of the feeder line according to the following formula:
wherein, GC is the supply and output electricity quantity of the feeder substation in the target time period, GRiFor the ith transformer in the target time periodN is the total number of transformers, tt, corresponding to the feeder line1Is the starting time point of the target time period, tt2Is the end time point of the target time period, TiThe effective path time of the path of the ith transformer.
5. Real-time line loss computing device based on distribution network switch state changes, its characterized in that includes:
the data acquisition module is used for acquiring a CIM topological model of the feeder line, real-time state information of a switch corresponding to the feeder line, the supply and output electric quantity of the feeder line transformer substation and the supply electric quantity of the transformer;
the model analysis module is used for analyzing the CIM topological model to obtain all paths corresponding to the feeder line and switches contained in all the paths;
the power supply relation determining module is used for obtaining power supply relation change information of all paths based on the real-time state information of the switch;
the line loss determining module is used for determining the real-time line loss of the feeder line according to the supply and output electric quantity of the feeder line transformer substation, the supply electric quantity of the transformer and the power supply relation change information of all paths; the model analysis module is specifically configured to:
obtaining a description file corresponding to a CIM topological model of a feeder line;
matching in the description file according to the naming rule of the feeder line transformer substation, and determining the feeder line transformer substation;
searching a description file to determine an outgoing switch of the feeder line transformer substation, and respectively traversing two paths where two ports of the outgoing switch are located;
determining whether a setting control exists in each path or not, and determining the paths and switches in the paths according to the determination result, wherein the setting control comprises a setting type switch, a transformer winding and an alternating current line section, and the setting type switch comprises a circuit breaker, a load switch and a disconnecting switch;
when traversing of every paths is finished, if the end point is a transformer winding, recording feeder line identification, transformer identification, switch identification and switch state corresponding to the path;
all paths and the switches included in each path are stored in the form of a linear index.
6. The apparatus of claim 5, wherein when all paths and switches included in each path are stored by way of a linear index, feeder substations and transformers in the paths are stored in the same tables, switches are stored in another tables, and the two tables are related by way of the linear index.
7. The apparatus of claim 5, wherein the power relationship determination module is specifically configured to:
determining the real-time state of the switches contained in all paths according to the acquired real-time state information of the switches;
determining the real-time communication state of each path according to the real-time states of all switches in each path;
and if the real-time connection state of any path is detected to be different from the last real-time connection states, determining the power supply relation change of the path, and recording the real-time and the state.
8, real-time line loss calculation equipment based on distribution network switch state change, characterized by includes:
or more processors;
a storage device for storing or more programs,
when the or more programs are executed by the or more processors, cause the or more processors to implement the method of any of claims 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710038696.0A CN106684867B (en) | 2017-01-19 | 2017-01-19 | Real-time line loss calculation method, device and equipment based on distribution network switch state change |
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| CN201710038696.0A CN106684867B (en) | 2017-01-19 | 2017-01-19 | Real-time line loss calculation method, device and equipment based on distribution network switch state change |
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| CN102664466A (en) * | 2012-05-23 | 2012-09-12 | 浙江省电力试验研究院 | Feeder line automation system |
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| CN103078314A (en) * | 2012-12-27 | 2013-05-01 | 安徽中兴继远信息技术股份有限公司 | Method and system for dynamically calculating line loss of 10KV line for layered power-distributing network |
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