CN112531717B - Method and device for calculating loop closing power flow of power system - Google Patents
Method and device for calculating loop closing power flow of power system Download PDFInfo
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- CN112531717B CN112531717B CN202011426184.XA CN202011426184A CN112531717B CN 112531717 B CN112531717 B CN 112531717B CN 202011426184 A CN202011426184 A CN 202011426184A CN 112531717 B CN112531717 B CN 112531717B
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Classifications
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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Abstract
The invention provides a loop closing tide calculation method of an electric power system, which is used for two wires for realizing loop closing operation between a high-voltage side bus and a medium-voltage side bus, and comprises the following steps: acquiring the number, impedance and active power flow of main transformers which are correspondingly contained in each branch circuit and are correspondingly connected in series by the two wires before loop closing operation; calculating the power angle of each wiring according to the obtained main transformer number, total impedance and total active power flow of each branch; and calculating the loop closing tide according to the calculated power angle of each wiring. By implementing the invention, calculation is not needed by special power flow analysis software and complicated power grid parameters, and time and labor are saved.
Description
Technical Field
The invention relates to the technical field of power grid power flow calculation, in particular to a loop closing power flow calculation method and device for a power system.
Background
The power flow calculation is a basic calculation mode in the power system, and the calculation is to calculate the distribution of active power, reactive power and voltage in the power network under the conditions of given power system network topology, element parameters and power generation and load parameters.
The loop-closing flow calculation is the most important application scene in flow calculation, and Newton's method and a derived rapid decomposition method thereof become the main flow algorithm of the loop-closing flow calculation. However, the mainstream algorithm needs to be calculated through special power flow analysis software and complex grid parameters, which is time-consuming and labor-consuming.
However, in engineering practical application, the active calculation results are mainly focused on corresponding to the active calculation results, the reactive calculation results, the voltage calculation results and the angle calculation results, and the reactive calculation results, the voltage calculation results and the like can be simplified. Therefore, it is necessary to provide a simplified loop closing power flow calculation method, and calculation is not needed through special power flow analysis software and complex power grid parameters, so that the purposes of time and labor saving are achieved.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide the loop closing power flow calculation method and the loop closing power flow calculation device for the power system, which do not need to calculate through special power flow analysis software and complex power grid parameters, and are time-saving and labor-saving.
In order to solve the technical problems, an embodiment of the present invention provides a loop closing power flow calculation method for an electric power system, which is used for two wires for implementing loop closing operation between a high-voltage side bus and a medium-voltage side bus, and the method includes the following steps:
s1, acquiring branches, which are respectively and correspondingly connected in series, of two wires before loop closing operation, wherein each branch corresponds to the number of main transformers, impedance and active power flow;
s2, calculating the power angle of each wiring according to the obtained main transformer number, the total impedance and the total active power flow of each branch;
s3, calculating the closed-loop power flow according to the calculated power angle of each wiring.
The step S2 specifically includes:
according to the formulaCalculating a work angle A of one of the two wires; wherein n is i The ith branch on one of the two wires corresponds to the number of the main transformers; x is X i An impedance of an i-th branch on one of the two wirings; p (P) i Active power flow of an ith branch on one of the two wires; i=1, 2,..m, m is the total number of branches contained on one of the two wires;
according to the formulaCalculating the work angle B of the other wire of the two wires; wherein n is j The j-th branch on the other of the two wires corresponds to the number of the main transformers; x is X j Impedance of the j-th branch on the other of the two wires; p (P) j Active power flow for the jth branch on the other of the two wires; j=1, 2,..k, k is the total number of branches contained on the other of the two wires.
Wherein, according to the formulaAnd calculating to obtain the closed loop power flow P.
The high-voltage side bus is a 500kV bus, and the medium-voltage side bus is a 110kV bus.
Wherein, the two wires each comprise three branches; wherein one branch of one wiring does not contain a main transformer.
The embodiment of the invention also provides a loop closing tide computing device of the power system, which is used for two wires for realizing loop closing operation between a high-voltage side bus and a medium-voltage side bus, and comprises the following steps:
the parameter acquisition unit is used for acquiring the branch circuits which are respectively and correspondingly connected in series by the two wires before the loop closing operation and the main transformer number, the impedance and the active power flow which are correspondingly contained in each branch circuit;
the circuit power angle calculation unit is used for calculating the power angle of each wiring according to the acquired main transformer number, total impedance and total active power flow of each branch circuit;
and the loop closing power flow calculation unit is used for calculating loop closing power flow according to the calculated power angle of each wiring.
Wherein, the circuit power angle calculation unit includes:
the first line power angle calculation module is used for calculating the power angle according to the formulaCalculating a work angle A of one of the two wires; wherein n is i The ith branch on one of the two wires corresponds to the number of the main transformers; x is X i An impedance of an i-th branch on one of the two wirings; p (P) i Active power flow of an ith branch on one of the two wires; i=1, 2,..m, m is the total number of branches contained on one of the two wires;
the second line power angle calculation module is used for calculating the power angle according to the formulaCalculating the work angle B of the other wire of the two wires; wherein n is j The j-th branch on the other of the two wires corresponds to the number of the main transformers; x is X j Impedance of the j-th branch on the other of the two wires; p (P) j Active power flow for the jth branch on the other of the two wires; j=1, 2,..k, k is the total number of branches contained on the other of the two wires.
The high-voltage side bus is a 500kV bus, and the medium-voltage side bus is a 110kV bus.
Wherein, the two wires each comprise three branches; wherein one branch of one wiring does not contain a main transformer.
The embodiment of the invention has the following beneficial effects:
the loop closing power flow can be rapidly calculated based on simple parameters such as the number of main transformers, the impedance, the active power flow and the like, and calculation is not needed through special power flow analysis software and complex power grid parameters, so that time and labor are saved, and the loop closing power flow calculation method has great application value in practical power flow calculation engineering.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
Fig. 1 is a flowchart of a power system loop closing power flow calculation method according to an embodiment of the present invention;
fig. 2 is an application scenario diagram of a loop closing power flow calculation method of an electric power system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a loop closing power flow calculation device of an electric power system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
The inventor finds that the line impedance is far smaller than the main transformer impedance because the line distance of the urban power network is relatively short, so that only the impedance of the main transformer can be considered in the power flow calculation, and the impedance of all lines in the middle is not needed to be considered. Further, it is considered that the main transformer parameters of the same substation are substantially equal, and it is considered that the impedance values of all main transformers in the same substation are equal.
Therefore, the inventor simplifies the power flow calculation based on the consideration, so that a new loop closing power flow calculation method is provided, calculation is not needed through special power flow analysis software and complicated power grid parameters, time and labor are saved, and great application value is realized in the practicality of power flow calculation engineering.
As shown in fig. 1, in an embodiment of the present invention, a loop closing power flow calculation method for an electric power system provided by the inventor is used for two wires (i.e., two wires have loop closing points on a high-voltage side bus and a medium-voltage side bus) for implementing loop closing operation between the high-voltage side bus (not shown) and the medium-voltage side bus (not shown), and the method includes the following steps:
s1, acquiring branches, which are respectively and correspondingly connected in series, of two wires before loop closing operation, wherein each branch corresponds to the number of main transformers, impedance and active power flow;
the specific process is that the impedance values of all main transformers in the same station are equal, only the impedance of the main transformer is considered, the impedance of all lines in the middle is not considered, and the impedance of the main transformer takes 100MVA as a standard per unit value. At this time, related parameters before the two wiring loop closing operations need to be acquired, which specifically include: the branch circuit contained in each wiring, the main variable number contained in each branch circuit, the impedance of the main transformer contained in each branch circuit and the active power flow of each branch circuit flowing through the main transformer.
In one embodiment, the high-voltage side bus is a 500kV bus, the medium-voltage side bus is a 110kV bus, two wires before the ring closing operation are obtained respectively contain three branches, and one branch on one wire does not contain a main transformer. At this time, the number of main transformers, the impedance and the active power flow on each branch can be counted. It should be noted that if the branch does not contain a main transformer, the number of main transformers, the impedance and the active power flow do not exist.
S2, calculating the power angle of each wiring according to the obtained main transformer number, the total impedance and the total active power flow of each branch;
the method comprises the following steps of firstly, according to a formulaCalculating the work angle A of one of the two wires (such as a first wire); wherein n is i The number of main transformers corresponding to the ith branch on one of the two wires (such as the first wire); x is X i One of two wiresImpedance of the ith branch on the wiring (e.g. a line); p (P) i Active power flow of the ith branch on one of the two wires (e.g. the first wire); i=1, 2,..m, m is the total number of branches contained on one of the two wires (e.g., the a-wire);
next, according to the formulaCalculating the work angle B of the other wire (such as the second wire) of the two wires; wherein n is j The j-th branch on the other wire (e.g. B wire) of the two wires corresponds to the number of the main transformer; x is X j Impedance of the j-th branch on the other wire (e.g. second wire) of the two wires; p (P) j Active power flow of the jth branch on the other wire (e.g. second wire) of the two wires; j=1, 2,..k, k is the total number of branches contained on the other of the two wires (e.g., the b-wire).
S3, calculating the closed-loop power flow according to the calculated power angle of each wiring.
The specific process is that according to the formulaAnd calculating to obtain the closed loop power flow P.
As shown in fig. 2, an application scenario of the power system loop closing power flow calculation method provided by the embodiment of the present invention is further described:
the high-voltage side bus is set to be a 500kV bus, the medium-voltage side bus is set to be a 110kV bus, and the two wires in loop closing operation are set through the first and second wires. Wherein, the first line is correspondingly connected with three branches in series and all the first line contains a main transformer; the second line is correspondingly connected with three branches in series, but only two branches contain main transformers.
At this time, the three branches on the A line have corresponding main numbers of n respectively 1 、n 2 、n 3 The impedance is X 1 、X 2 、X 3 Active power flows are respectively P 1 、P 2 、P 3 Calculating the work angle of the first line as
Meanwhile, the corresponding main variable number of the three branches on the B line is n respectively 4 、n 5 0, respectively the impedance is X 4 、X 5 0, the active power flow is P respectively 4 、P 5 0, calculating the work angle of the line B as
Finally, according to the formulaAnd calculating to obtain the closed loop power flow P.
As shown in fig. 3, in an embodiment of the present invention, a loop closing power flow calculation device for an electric power system is provided, which is used for two wires for implementing loop closing operation between a high-voltage side bus and a medium-voltage side bus, and includes:
a parameter obtaining unit 110, configured to obtain branches, in which two wires are connected in series, respectively, and a number of main transformers, impedance, and active power flow corresponding to each branch before loop closing operation;
a line power angle calculating unit 120, configured to calculate a power angle of each wiring according to the obtained number of main transformers, total impedance, and total active power flow of each branch;
and a loop closing power flow calculation unit 130 for calculating a loop closing power flow according to the calculated power angle of each wiring.
Wherein, the circuit power angle calculation unit includes:
the first line power angle calculation module is used for calculating the power angle according to the formulaCalculating a work angle A of one of the two wires; wherein n is i The ith branch on one of the two wires corresponds to the number of the main transformers; x is X i An impedance of an i-th branch on one of the two wirings; p (P) i Active power flow of an ith branch on one of the two wires; i=1, 2,..m, m is the total number of branches contained on one of the two wires;
the second line power angle calculation module is used for calculating the power angle according to the formulaCalculating the work angle B of the other wire of the two wires; wherein n is j The j-th branch on the other of the two wires corresponds to the number of the main transformers; x is X j Impedance of the j-th branch on the other of the two wires; p (P) j Active power flow for the jth branch on the other of the two wires; j=1, 2,..k, k is the total number of branches contained on the other of the two wires.
The high-voltage side bus is a 500kV bus, and the medium-voltage side bus is a 110kV bus.
Wherein, the two wires each comprise three branches; wherein one branch of one wiring does not contain a main transformer.
The embodiment of the invention has the following beneficial effects:
the loop closing power flow can be rapidly calculated based on simple parameters such as the number of main transformers, the impedance, the active power flow and the like, and calculation is not needed through special power flow analysis software and complex power grid parameters, so that time and labor are saved, and the loop closing power flow calculation method has great application value in practical power flow calculation engineering.
It should be noted that, in the above embodiment of the apparatus, each unit included is only divided according to the functional logic, but not limited to the above division, so long as the corresponding function can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in implementing the methods of the above embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (6)
1. The utility model provides a power system closes ring trend calculation method, is used for realizing between high-pressure side generating line and the medium-pressure side generating line two wiring that closes the ring operation, its characterized in that, the method includes following steps:
s1, acquiring branches, which are respectively and correspondingly connected in series, of two wires before loop closing operation, wherein each branch corresponds to the number of main transformers, impedance and active power flow;
s2, calculating the power angle of each wiring according to the obtained main transformer number, the total impedance and the total active power flow of each branch;
s3, calculating to obtain a closed-loop power flow according to the calculated power angle of each wiring;
the step S2 specifically includes:
according to the formulaCalculating a work angle A of one of the two wires; wherein n is i The ith branch on one of the two wires corresponds to the number of the main transformers; x is X i An impedance of an i-th branch on one of the two wirings; p (P) i Active power flow of an ith branch on one of the two wires; i=1, 2,..m, m is the total number of branches contained on one of the two wires;
according to the formulaCalculating the work angle B of the other wire of the two wires; wherein n is j The j-th branch on the other of the two wires corresponds to the number of the main transformers; x is X j Impedance of the j-th branch on the other of the two wires; p (P) j Active power flow for the jth branch on the other of the two wires; j=1, 2,..k, k is the total number of branches contained on the other of the two wires;
wherein, according to the formulaAnd calculating to obtain the closed loop power flow P.
2. The power system loop closing tide computing method of claim 1, wherein the high-voltage side bus is a 500kV bus, and the medium-voltage side bus is a 110kV bus.
3. The power system loop closing power flow calculation method as claimed in claim 2, wherein the two wires each have three branches; wherein one branch of one wiring does not contain a main transformer.
4. The utility model provides a power system closes ring trend calculation device for on two wires that realize closing ring operation between high-pressure side generating line and the medium-pressure side generating line, its characterized in that includes:
the parameter acquisition unit is used for acquiring the branch circuits which are respectively and correspondingly connected in series by the two wires before the loop closing operation and the main transformer number, the impedance and the active power flow which are correspondingly contained in each branch circuit;
the circuit power angle calculation unit is used for calculating the power angle of each wiring according to the acquired main transformer number, total impedance and total active power flow of each branch circuit;
the loop closing power flow calculation unit is used for calculating loop closing power flow according to the calculated power angle of each wiring;
wherein, the circuit power angle calculation unit includes:
the first line power angle calculation module is used for calculating the power angle according to the formulaCalculating a work angle A of one of the two wires; wherein n is i The ith branch on one of the two wires corresponds to the number of the main transformers; x is X i An impedance of an i-th branch on one of the two wirings; p (P) i Active power flow of an ith branch on one of the two wires; i=1, 2,..m, m is the total number of branches contained on one of the two wires;
the second line power angle calculation module is used for calculating the power angle according to the formulaCalculating the work angle B of the other wire of the two wires; wherein n is j The j-th branch on the other of the two wires corresponds to the number of the main transformers; x is X j Impedance of the j-th branch on the other of the two wires; p (P) j Active power flow for the jth branch on the other of the two wires; j=1, 2,..k, k is the total number of branches contained on the other of the two wires;
wherein, according to the formulaAnd calculating to obtain the closed loop power flow P.
5. The power system loop closing flow calculation device of claim 4, wherein the high-voltage side bus is a 500kV bus and the medium-voltage side bus is a 110kV bus.
6. The power system loop-closing power flow calculation device according to claim 5, wherein the two wires each have three branches; wherein one branch of one wiring does not contain a main transformer.
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| CN109687439A (en) * | 2018-12-25 | 2019-04-26 | 积成电子股份有限公司 | A kind of quick calculation method of power transmission network Alloy White Iron |
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| EP3098924B1 (en) * | 2015-05-29 | 2020-10-28 | Electricité de France | A method and device for calculation of power flow in the distribution grid |
| CN105552882B (en) * | 2015-12-09 | 2018-03-27 | 云南电网有限责任公司红河供电局 | A kind of control method of power network cyclization |
| CN108879695A (en) * | 2018-07-13 | 2018-11-23 | 海南电网有限责任公司电力科学研究院 | A kind of foundation and calculation method of DC flow model |
| CN110912138A (en) * | 2019-12-05 | 2020-03-24 | 云南电网有限责任公司红河供电局 | Distribution network loop closing control method |
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