CN110445135B - Hierarchical calculation method for load transfer capacity of power distribution network based on electrical structure and parameters - Google Patents
Hierarchical calculation method for load transfer capacity of power distribution network based on electrical structure and parameters Download PDFInfo
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- CN110445135B CN110445135B CN201910726073.1A CN201910726073A CN110445135B CN 110445135 B CN110445135 B CN 110445135B CN 201910726073 A CN201910726073 A CN 201910726073A CN 110445135 B CN110445135 B CN 110445135B
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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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- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The invention relates to a hierarchical calculation method for load transfer capacity of a power distribution network, which comprises the following steps: identifying a connecting wire, a bus and a power supply station in an electrical structure schematic diagram, identifying branch wires in each connecting wire, dividing the connecting wire into a plurality of sections by nodes formed by the branch wires and the connecting wire, and identifying the minimum element of each section of connecting wire, wherein the constraint condition of the load transfer quantity of each section of connecting wire is as follows: the smaller of the minimum component-allowed current-carrying capacity, the upper line load transfer amount, or the upper power supply station power supply capability margin; calculating the load transfer capacity of the connecting lines section by section, and selecting the connecting line with the maximum value of the load transfer capacity as a transfer channel of the bus section; the maximum value of the load transfer capacity is compared with the sum of other non-interconnecting line loads of the bus section, and a smaller value is selected as the load transfer capacity of the bus; and finally, summing the load transfer capacity of the bus to which the power station belongs. The method improves the accuracy of the calculation result and provides reliable support for power grid planning and operation mode arrangement.
Description
Technical Field
The invention belongs to the technical field of power grid planning and scheduling operation, and particularly relates to a hierarchical calculation method for load transfer capacity of a power distribution network based on an electrical structure and parameters.
Background
The tie line is a line for connecting the buses of the two power stations, is disconnected for standby in a normal mode, and is switched on to run after the buses lose power, so that load shedding is realized. The tie line has the function of transferring load, is important to improving the power supply reliability and guaranteeing the safe and stable operation of the power grid, and the load transferring capability of the tie line is important to consider when the power grid is planned and the operation mode is arranged. At present, when calculating the load transfer capacity of the interconnecting link, only the constraint condition of a channel and the transferable load are often considered, and the consideration of the electrical structure and parameters is insufficient, so that the calculation result is inaccurate, the load cannot be transferred according to the expected, and the influence on the power supply reliability and the safe and stable operation of the power grid is formed.
Therefore, based on the problems, the power distribution network load transfer capacity grading calculation method based on the electrical structure and the parameters, which improves the accuracy of calculation results and provides reliable support for power grid planning and operation mode arrangement, has important practical significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a hierarchical calculation method for the load transfer capacity of a power distribution network based on an electrical structure and parameters, which improves the accuracy of calculation results and provides reliable support for power grid planning and operation mode arrangement.
The invention solves the technical problems by adopting the following technical scheme:
the hierarchical calculation method for the load transfer capacity of the power distribution network based on the electrical structure and the parameters comprises the following steps:
s1, calling an electrical structure diagram, identifying a connecting wire, a bus and a power station in the electrical structure diagram, and dividing the electrical structure diagram into three stages of connecting wires, buses and power stations;
s2, identifying branch lines in each connecting line, forming nodes at the intersections of the branch lines and the connecting lines, dividing the connecting lines into a plurality of sections by the nodes, and identifying the minimum element of each section of connecting line, wherein the minimum element can be obtained according to parameter identification in a conventional electrical structure schematic diagram, and the constraint conditions of the load transfer quantity of each section of connecting line are as follows: the smaller of the minimum component-allowed current capacity and the upper line load transfer amount or the upper power supply station power supply capacity margin;
P＝MIN(P1,P2) (1)
wherein, P: load transfer amount of the section of tie line
P1: the current-carrying capacity allowed by the section of interconnecting wire
P2: the load transfer amount of the upper line or the power supply capacity margin of the upper power station;
s3, calculating the load transfer capacity of the connecting line segment by segment according to the constraint condition in the step S2, wherein the load transfer capacity of the last connecting line segment is the load transfer capacity of the connecting line;
s4, taking the bus section as a unit, and selecting the connecting line with the maximum value of the load transfer capacity of all connecting lines in the bus section as a transfer channel of the bus section;
s5, comparing the maximum value of the load transfer capacity obtained in the step S4 with the sum of other non-interconnecting line loads of the bus section, and selecting a smaller value as the load transfer capacity of the bus;
and S6, summing the load transfer capacity of the bus to which the power supply station belongs to obtain the load transfer capacity of the power supply station.
In step S3, when calculating the load transfer capability of the link segment by segment, it is necessary to start calculation from the direction of the opposite power supply station to which the link is connected.
The invention has the advantages and positive effects that:
1. the invention provides a hierarchical calculation method for load transfer capacity of a power distribution network based on an electrical structure and parameters, wherein a research object is divided into three stages of power stations, buses and connecting lines based on an electrical structure schematic diagram, each stage is provided with respective constraint conditions, the load transfer capacity is calculated step by step, finally, a load transfer capacity result meeting all constraint conditions is formed, the accuracy of the calculation result is improved, and reliable support is provided for power grid planning and operation mode arrangement;
2. according to the invention, the electrical structure is disassembled step by step and section by section, constraint conditions are set step by step according to influence factors of each level, and calculation is carried out section by section; compared with the existing power distribution network load transfer capacity calculation method, the method has the advantages that the considered influence factors are more comprehensive, and the calculation result is more accurate.
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The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting the scope of the present invention. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.
Fig. 1 is a schematic structural diagram of an electrical schematic provided in an embodiment of the present invention;
Detailed Description
First, it should be noted that the following detailed description of the specific structure, characteristics, advantages, and the like of the present invention will be given by way of example, however, all descriptions are merely illustrative, and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implicit in the embodiments referred to herein may still be combined or truncated in any way between such features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly referred to herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
The present invention will be described in detail with reference to fig. 1.
Example 1
S1, identifying and dividing the electric structure schematic diagram into three stages of connecting lines, buses and power stations; specifically, a certain electrical structure schematic diagram is called in, as shown in fig. 1, according to the definitions of the connecting lines, the buses and the power supply stations, the connecting lines (connecting lines 1, 2 and 3) and the corresponding power supply stations (station 1, station 2 and station 3) and the buses are identified;
s2, identifying branch lines in each connecting line, wherein the cross points of the branch lines and the connecting lines form nodes, the connecting lines are divided into a plurality of sections by the nodes, the minimum element of each section of connecting line is identified, and the constraint conditions of the load transfer quantity of each section of connecting line are as follows: the smaller of the minimum component-allowed current capacity and the upper line load transfer amount or the upper power supply station power supply capacity margin;
P＝MIN(P1,P2) (1)
wherein, P: load transfer amount of the section of tie line
P1: the current-carrying capacity allowed by the section of interconnecting wire
P2: the load transfer amount of the upper line or the power supply capacity margin of the upper power station;
taking the load transfer capability of the power supply station 2 in fig. 1 as an example, the calculation process will be described, and the solution methods of the station 1 and the station 3 are the same;
and S3, calculating the load transfer capacity step by step from the connecting line, wherein when calculating the load transfer capacity of the connecting line step by step, the calculation needs to be started from the direction of the opposite-end power supply station connected with the connecting line.
The power station 2 runs in two bus sections, and the load transfer capacity of the connecting lines connected with the bus 1 and the bus 2 is required to be calculated respectively;
the bus 1 is connected with the connecting wire 3, 1 branch exists, the load is F6, the connecting wire 3 is divided into 2 sections, the sections are marked as sections 31 and 32, the allowable current-carrying capacity of the minimum element is T8 and T9 respectively, the power supply capacity margin of the power station 3 is Y2, the load transfer capacity Z is calculated section by section, the load transfer capacity of each section of connecting wire should meet the constraint of the formula (1), and the load transfer capacity of the last section of connecting wire is the load transfer capacity of the connecting wire. Z (segment 31) =min (T8, Y2), Z (segment 32) =min (MIN (T8, Y2) -F6, T9), Z (segment 32) is the load transfer capability of tie line 3; bus 2 connects tie 1 and tie 2, tie 1 has 3 branches, the load is F1, F2, F3 respectively, divided into 4 sections, marked as section 11, section 12, section 13, section 14, minimum component allowable carrying capacity is T1, T2, T3, T4 respectively, power supply capacity margin of power station 1 is Y1, Z (section 11) =MIN (T1, Y1), Z (section 12) =MIN (T1, Y1) -F1, T2), Z (section 13) =MIN (MIN (MIN (T1, Y1) -F1, T2) -F2, T3), Z (section 14) =MIN (MIN (MIN (T1, Y1) -F1, T2) -F2, T3) -F4), Z (section 14) is load transfer capacity of tie 1, and likewise load transfer capacity Z (section 23) =MIN (MIN (T7, Y2) -F5, T5;
s4, determining a transfer channel of the bus section: the bus 1 is connected with the connecting wire 3 only, the connecting wire 3 is a load transfer channel of the bus 1, the bus 2 is connected with the connecting wire 1 and the connecting wire 2, and the connecting wire with larger load transfer capacity is a load transfer channel of the bus 2;
s5, calculating the load transfer capacity of the bus: comparing the maximum value of the load transfer capacity obtained in the step S4 with the sum of other non-interconnecting line loads of the bus section, and selecting a smaller value as the load transfer capacity of the bus; the load transfer capacity of the bus bar 1 is MIN (Z (segment 32), l11+l12+ … … l1n), and the load transfer capacity of the bus bar 2 is MIN (MAX (Z (segment 14), Z (segment 23)), l21+l22+ … … l2n);
s6, calculating the load transfer capacity of the power supply station, wherein the load transfer capacity of the power supply station 2 is the sum of the load transfer capacities of the bus 1 and the bus 2.
The foregoing examples illustrate the invention in detail, but are merely preferred embodiments of the invention and are not to be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (2)
1. The power distribution network load transfer capacity grading calculation method based on the electrical structure and the parameters is characterized by comprising the following steps of: the method comprises the following steps:
s1, calling an electrical structure diagram, identifying a connecting wire, a bus and a power station in the electrical structure diagram, and dividing the electrical structure diagram into three stages of connecting wires, buses and power stations;
s2, identifying branch lines in each connecting line, wherein the cross points of the branch lines and the connecting lines form nodes, the connecting lines are divided into a plurality of sections by the nodes, the minimum element of each section of connecting line is identified, and the constraint conditions of the load transfer quantity of each section of connecting line are as follows: the smaller of the minimum component-allowed current-carrying capacity, the upper line load transfer amount, or the upper power supply station power supply capability margin;
P＝MIN(P1,P2) (1)
wherein, P: load transfer amount of the section of tie line
P1: the current-carrying capacity allowed by the section of interconnecting wire
P2: the load transfer amount of the upper line or the power supply capacity margin of the upper power station;
s3, calculating the load transfer capacity of the connecting line segment by segment according to the constraint condition in the step S2, wherein the load transfer capacity of the last connecting line segment is the load transfer capacity of the connecting line;
s4, taking the bus section as a unit, and selecting the connecting line with the maximum value of the load transfer capacity of all connecting lines in the bus section as a transfer channel of the bus section;
s5, comparing the maximum value of the load transfer capacity obtained in the step S4 with the sum of other non-interconnecting line loads of the bus section, and selecting a smaller value as the load transfer capacity of the bus;
and S6, summing the load transfer capacity of the bus to which the power supply station belongs to obtain the load transfer capacity of the power supply station.
2. The hierarchical computing method for load transfer capacity of power distribution network based on electrical structure and parameters according to claim 1, wherein: in the step S3, when calculating the load transfer capability of the link segment by segment, calculation needs to be started from the direction of the opposite power supply station to which the link is connected.
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