CN112531717A - Method and device for calculating closed loop power flow of power system - Google Patents
Method and device for calculating closed loop power flow of power system Download PDFInfo
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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 load flow calculation method for a power system, which is used for two distribution lines for realizing loop closing operation between a high-voltage side bus and a medium-voltage side bus and comprises the following steps: obtaining branches of two wires which are correspondingly connected in series respectively before loop closing operation and the number of main transformers, impedance and active power flow which are correspondingly contained in each branch; 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 to obtain the closed loop power flow according to the calculated power angle of each wire. By implementing the method, special power flow analysis software and complex power grid parameters are not needed for calculation, so that the time and the labor are saved.
Description
Technical Field
The invention relates to the technical field of power grid load flow calculation, in particular to a method and a device for calculating closed loop load flow of a power system.
Background
Load flow calculation is a basic calculation mode in a power system, and the calculation is to calculate the distribution of active power, reactive power and voltage in a power grid under the conditions of given power system network topology, element parameters and power generation and load parameters.
The closed-loop power flow calculation is the most important application scene in power flow calculation, and a Newton method and a quick decomposition method derived from the Newton method become mainstream algorithms for closed-loop power flow calculation. However, the mainstream algorithm needs to be calculated through special power flow analysis software and complex power grid parameters, which is time-consuming and labor-consuming.
However, in practical engineering applications, the active calculation result is mainly focused on four calculation results of active, reactive, voltage and angle, and the calculation results of reactive, voltage and the like can be processed in a simplified manner. Therefore, it is necessary to provide a simplified loop closing load flow calculation method, which does not need to calculate through special power load flow analysis software and complex power grid parameters, and achieves the purpose of time saving and labor saving.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method and a device for calculating a closed loop power flow of an electric 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 above technical problem, an embodiment of the present invention provides a power system loop closing load flow calculation method, which is used for two distribution lines between a high-voltage side bus and a medium-voltage side bus to implement loop closing operation, and the method includes the following steps:
s1, obtaining branches of the two wires which are respectively and correspondingly connected in series before loop closing operation, and the number of main transformers, impedance and active power flow which are correspondingly contained in each branch;
s2, 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 S3, calculating to obtain the closed loop power flow according to the calculated power angle of each wire.
Wherein, the step S2 specifically includes:
according to the formula
Calculating the power angle A of one of the two wires; wherein n isiThe number of main transformers correspondingly contained in the ith branch on one of the two wirings; xiThe impedance of the ith branch on one of the two wirings; piThe active power flow of the ith branch on one of the two wirings is measured; i is 1, 2, m, m is the total number of branches contained in one of the two wires;
according to the formula
Calculating the power angle B of the other one of the two wires; wherein n isjThe number of main transformers correspondingly contained in the jth branch on the other of the two wirings; xjThe impedance of the jth branch on the other of the two wirings; pjThe active power flow of the jth branch on the other wiring of the two wirings is provided; j is equal to 1, and j is equal to 1,k, k is the total number of branches contained in the other of the two wires.
Wherein according to the formula
And 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 wirings both comprise three branches; wherein, one branch circuit on one distribution line does not contain a main transformer.
The embodiment of the present invention further provides a loop closing load flow calculation device for an electrical power system, which is used for two distribution lines for realizing loop closing operation between a high-voltage side bus and a medium-voltage side bus, and includes:
the parameter obtaining unit is used for obtaining branches which are respectively and correspondingly connected in series with two wires before loop closing operation and the number of main transformers, impedance and active power flow which are correspondingly contained in each branch;
the line power angle calculation unit is used for 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 the closed loop power flow calculation unit is used for calculating to obtain the closed loop power flow according to the calculated power angle of each wire.
Wherein the line power angle calculation unit includes:
a first line power angle calculation module for calculating the power angle according to a formula
Calculating the power angle A of one of the two wires; wherein n isiThe number of main transformers correspondingly contained in the ith branch on one of the two wirings; xiThe impedance of the ith branch on one of the two wirings; piThe active power flow of the ith branch on one of the two wirings is measured; i is 1, 2, m, m is the total number of branches contained in one of the two wires;
a second line power angle calculation module for calculating the power angle according to the formula
Calculating the power angle B of the other one of the two wires; wherein n isjThe number of main transformers correspondingly contained in the jth branch on the other of the two wirings; xjThe impedance of the jth branch on the other of the two wirings; pjThe active power flow of the jth branch on the other wiring of the two wirings is provided; j is 1, 2, k, k is the total number of branches contained in 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 wirings both comprise three branches; wherein, one branch circuit on one distribution line does not contain a main transformer.
The embodiment of the invention has the following beneficial effects:
the method can quickly calculate the closed-loop power flow only based on simple parameters such as the number of main transformers, impedance, active power flow and the like, does not need to calculate through special power flow analysis software and complex power grid parameters, is time-saving and labor-saving, and has great application value in the practical power flow calculation engineering.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a flowchart of a loop closing power flow calculation method for an electric power system according to an embodiment of the present invention;
fig. 2 is an application scenario diagram of a loop closing power flow calculation method for 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 apparatus for an electric power system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The inventor finds that the line impedance is far smaller than the main transformer impedance due to the short distance of the urban power grid line, so that only the impedance of the main transformer can be considered in the power flow calculation without considering the impedance of all lines in the middle. In addition, the main transformer parameters of the same substation are considered to be basically equal, and it can be considered that the impedance values of all main transformers in the same substation are assumed to be equal.
Therefore, the inventor simplifies the load flow calculation based on the consideration, so that a novel closed loop load flow calculation method is provided, calculation is not required to be performed through special power load flow analysis software and complex power grid parameters, time and labor are saved, and the method has great application value in load flow calculation engineering practicality.
As shown in fig. 1, in an embodiment of the present invention, a closed loop power flow calculation method for an electric power system is proposed by the inventor, which is used on two wirings (i.e., two wirings have a loop closing point on a high-voltage side bus and a medium-voltage side bus) between a high-voltage side bus (not shown) and a medium-voltage side bus (not shown) to implement a closed loop operation, and the method includes the following steps:
s1, obtaining branches of the two wires which are respectively and correspondingly connected in series before loop closing operation, and the number of main transformers, impedance and active power flow which are correspondingly contained in each branch;
the specific process is that the impedance values of all main transformers in the same station are assumed to be equal, only the impedance of the main transformers is considered, the impedance of all intermediate lines is not considered, and the impedance of the main transformers takes a per unit value with 100MVA as a reference. At this time, it is necessary to obtain relevant parameters before loop closing operation of the two wires, which specifically includes: the main transformer comprises a plurality of branches on each wiring, a main transformer number of each branch, impedance of the main transformer of each branch and active power flow of each branch 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 closed loop operation are obtained both comprise three branches, and one branch on one wire does not comprise a main transformer. At this time, the number of main transformers, impedance and active power flow on each branch can be counted. It should be noted that if the branch does not include a main transformer, the number of main transformers, impedance and active power flow do not exist.
S2, calculating the power angle of each wiring according to the obtained main transformer number, total impedance and total active power flow of each branch;
the specific process is that firstly, according to the formula
Calculating the power angle A of one of the two wires (such as the first wire); wherein n isiThe number of main transformers corresponding to the ith branch on one of the two wiring lines (such as the first line); xiThe impedance of the ith branch on one of the two wirings (such as the first wiring); piThe active power flow of the ith branch on one of the two wiring lines (such as the first line); i is 1, 2, and m is the total number of branches contained in one of two wires (such as a nail line);
secondly, according to the formula
Calculating the power angle B of the other one of the two wirings (such as the B line); wherein n isjThe number of main transformers corresponding to the jth branch on the other wiring (such as the B line) of the two wirings; xjThe impedance of the jth branch on the other of the two wirings (such as the B line); pjThe active power flow of the jth branch on the other wiring (such as a B line) of the two wirings; j is 1, 2, k, k is the total number of branches contained in the other of the two wires (e.g., line b).
And S3, calculating to obtain the closed loop power flow according to the calculated power angle of each wire.
The specific process is according to the formula
And calculating to obtain the closed loop power flow P.
As shown in fig. 2, an application scenario of the power system closed loop power flow calculation method provided by the embodiment of the present invention is further described:
the high-voltage side bus is set as a 500kV bus, the medium-voltage side bus is set as a 110kV bus, and two wires in closed-loop operation are set through an A-B line at the moment. Wherein, the first line is correspondingly connected with three branches in series and all contain a main transformer; the B line is correspondingly connected with three branches in series, but only two branches contain main transformers.
At this time, the number of the corresponding main transformers of the three branches on the A line is n1、n2、n3Impedance is X respectively1、X2、X3Active power flow is P1、P2、P3Calculating the power angle of the first line as
Meanwhile, the number of main transformers respectively corresponding to the three branches on the B line is n4、n50, impedances are X respectively4、X50, active power flow is P4、P50, calculating the power angle of the second line as
Finally, according to the formula
And calculating to obtain the closed loop power flow P.
As shown in fig. 3, in an embodiment of the present invention, an apparatus for calculating a closed-loop power flow of a power system is provided, which is used for two power lines between a high-voltage side bus and a medium-voltage side bus to implement closed-loop operation, and includes:
the parameter obtaining unit 110 is configured to obtain branches corresponding to the two wires before the loop closing operation, and a number of main transformers, impedance and active power flow included in each branch;
the line power angle calculation unit 120 is configured to calculate a power angle of each wire according to the obtained main transformer number, total impedance, and total active power flow of each branch;
and the closed-loop power flow calculation unit 130 is configured to calculate a closed-loop power flow according to the calculated power angle of each wire.
Wherein the line power angle calculation unit includes:
a first line power angle calculation module for calculating the power angle according to a formula
Calculating the power angle A of one of the two wires; wherein n isiThe number of main transformers correspondingly contained in the ith branch on one of the two wirings; xiThe impedance of the ith branch on one of the two wirings; piThe active power flow of the ith branch on one of the two wirings is measured; i is 1, 2, m, m is the total number of branches contained in one of the two wires;
a second line power angle calculation module for calculating the power angle according to the formula
Calculating the power angle B of the other one of the two wires; wherein n isjThe number of main transformers correspondingly contained in the jth branch on the other of the two wirings; xjThe impedance of the jth branch on the other of the two wirings; pjThe active power flow of the jth branch on the other wiring of the two wirings is provided; j is 1, 2, k, k is the total number of branches contained in 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 wirings both comprise three branches; wherein, one branch circuit on one distribution line does not contain a main transformer.
The embodiment of the invention has the following beneficial effects:
the method can quickly calculate the closed-loop power flow only based on simple parameters such as the number of main transformers, impedance, active power flow and the like, does not need to calculate through special power flow analysis software and complex power grid parameters, is time-saving and labor-saving, and has great application value in the practical power flow calculation engineering.
It should be noted that, in the above device embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (9)
1. A loop closing load flow calculation method of a power system is used for two distribution lines for realizing loop closing operation between a high-voltage side bus and a medium-voltage side bus, and is characterized by comprising the following steps of:
s1, obtaining branches of the two wires which are respectively and correspondingly connected in series before loop closing operation, and the number of main transformers, impedance and active power flow which are correspondingly contained in each branch;
s2, 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 S3, calculating to obtain the closed loop power flow according to the calculated power angle of each wire.
2. The power system loop closing power flow calculation method according to claim 1, wherein the step S2 specifically includes:
according to the formula
Calculating the power angle A of one of the two wires; wherein n isiThe number of main transformers correspondingly contained in the ith branch on one of the two wirings; xiThe impedance of the ith branch on one of the two wirings; piThe active power flow of the ith branch on one of the two wirings is measured; i is 1, 2, m, m is the total number of branches contained in one of the two wires;
according to the formula
Calculating the power angle B of the other one of the two wires; wherein n isjThe number of main transformers correspondingly contained in the jth branch on the other of the two wirings; xjThe impedance of the jth branch on the other of the two wirings; pjThe active power flow of the jth branch on the other wiring of the two wirings is provided; j is 1, 2, k, k is the total number of branches contained in the other of the two wires.
3. The power system closed loop power flow calculation method of claim 2, wherein the calculation method is based on a formula
And calculating to obtain the closed loop power flow P.
4. The power system loop closing power flow calculation method according to claim 3, wherein the high-voltage side bus is a 500kV bus, and the medium-voltage side bus is a 110kV bus.
5. The power system loop closing power flow calculation method of claim 4, wherein each of the two wires comprises three branches; wherein, one branch circuit on one distribution line does not contain a main transformer.
6. The utility model provides an electric power system closes ring trend accounting device for realize closing two distribution lines of ring operation between high pressure side generating line and the medium voltage side generating line, its characterized in that includes:
the parameter obtaining unit is used for obtaining branches which are respectively and correspondingly connected in series with two wires before loop closing operation and the number of main transformers, impedance and active power flow which are correspondingly contained in each branch;
the line power angle calculation unit is used for 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 the closed loop power flow calculation unit is used for calculating to obtain the closed loop power flow according to the calculated power angle of each wire.
7. The power system loop closing power flow calculation device according to claim 6, wherein the line power angle calculation unit includes:
a first line power angle calculation module for calculating the power angle according to a formula
Calculating the power angle A of one of the two wires; wherein n isiThe number of main transformers correspondingly contained in the ith branch on one of the two wirings; xiThe impedance of the ith branch on one of the two wirings; piThe active power flow of the ith branch on one of the two wirings is measured; i is 1, 2, m, m is the total number of branches contained in one of the two wires;
a second line power angle calculation module for calculating the power angle according to the formula
Calculating the power angle B of the other one of the two wires; wherein n isjThe number of main transformers correspondingly contained in the jth branch on the other of the two wirings; xjThe impedance of the jth branch on the other of the two wirings; pjThe active power flow of the jth branch on the other wiring of the two wirings is provided; j is 1, 2, k, k is the total number of branches contained in the other of the two wires.
8. The power system loop closing power flow calculation device according to claim 7, wherein the high voltage side bus is a 500kV bus, and the medium voltage side bus is a 110kV bus.
9. The power system closed loop power flow calculation device of claim 8, wherein each of the two wires comprises three branches; wherein, one branch circuit on one distribution line does not contain a main transformer.
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