CN110955967A - Modeling method and system for bus tie spare power automatic switching in BPA - Google Patents
Modeling method and system for bus tie spare power automatic switching in BPA Download PDFInfo
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Abstract
The invention provides a modeling method for a bus tie spare power automatic switching device on BPA, which comprises the following steps: detecting a data card where a component with a fault is located, annotating the data card, and disconnecting a fault original; carrying out load flow calculation, judging whether an abnormal identified branch is generated or not, if so, deleting the branch and re-executing the step; otherwise, the BPA performs data processing, and judges whether an isolated node or a subsystem is generated through PFO output data, so as to judge whether the bus tie spare power automatic switching exists. The invention also provides a modeling system of the bus tie spare power automatic switching in BPA, which realizes N-1(+1) static safety analysis and loss load calculation considering bus tie spare power automatic switching actions, can accurately simulate corresponding spare power automatic switching actions caused by equipment faults, improves the risk discrimination accuracy, identifies most of power grid operation safety risks and accident hidden dangers, and improves the capacities of power grid operation control departments and personnel and pre-control future potential power grid risks.
Description
Technical Field
The invention relates to the technical field of static stability analysis of a power grid, in particular to a modeling method and a modeling system for bus tie backup power automatic switching in BPA (Business Process analysis).
Background
In recent years, with the modernization degree of the production and life of people in China being increasingly improved, the demand and the dependence degree of people on electric power are also multiplied, and the requirement of some electric power users on uninterrupted power supply is more prominent. The power supply of China mainly depends on a national power grid for power supply, power gaps are continuously increased, particularly, the phenomenon of power shortage is serious in the peak period of power utilization, so that a power plant or a power distribution generator can be built by a large number of large-scale enterprises, and the high reliability of uninterrupted power supply and power supply of power supplies is guaranteed to become an important part of protection and control loops in modern power distribution projects by realizing mutual switching of various power supplies.
At present, a static safety analysis of a regional power grid for analyzing N-1 and other faults by using BPA does not consider a model and action of bus tie spare power automatic switching, action logics of secondary equipment such as spare power automatic switching are not sufficiently considered, action behaviors of the secondary equipment such as backup power automatic switching when a fault occurs in a power system are difficult to comprehensively show, a fault process is difficult to accurately simulate, and operation risks of the power grid after the fault are difficult to evaluate.
Disclosure of Invention
The invention provides a modeling method and a modeling system for bus tie spare power automatic switching in BPA (Business Process bus) for overcoming the technical defects that the static safety analysis of the existing power grid does not consider a model and actions of bus tie spare power automatic switching, the action logic of secondary equipment such as spare power automatic switching and the like is not sufficiently considered, the action behaviors of the secondary equipment such as backup power automatic switching and the like in a fault of a power system are difficult to comprehensively show, the fault process is difficult to accurately simulate, and the operation risk of the power grid after the fault is evaluated.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a modeling method for bus tie spare power automatic switching in BPA comprises the following steps:
s1: detecting a data card where a component with a fault is located, annotating the data card, and disconnecting a fault original;
s2: performing load flow calculation, judging whether an abnormal identified branch is generated, and if so, executing step S3; otherwise, go to step S4;
s3: deleting the branch and re-executing step S2;
s4: and carrying out data processing by the BPA, and judging whether an isolated node or a subsystem is generated or not through PFO output data to judge whether bus tie spare power automatic switching exists or not.
In step S2, the power flow calculation adopts a calculation method common to the power system, and checks whether the proposed power system planning scheme can meet the requirements of various operation modes.
Before the load flow calculation, relevant parameters are collected, and whether an abnormal identified branch is generated or not is judged through calculation.
Wherein, the step S3 is used to delete all branches that cannot be normally identified.
In step S4, by determining whether an isolated node or a subsystem is generated, the voltage level of the isolated node or the subsystem is determined, and thus, whether the bus tie backup power automatic switching device is available is determined.
The modeling method for the bus tie spare power automatic switching in the BPA further comprises the following steps:
s5: if the bus tie spare power automatic switching is available, the bus tie switch is closed; otherwise, deleting the corresponding isolated node or subsystem.
A modeling system for bus tie backup power automatic switching in BPA comprises a detection module, an annotation module, a load flow calculation module, a branch state judgment processing module and a BPA subsystem; wherein:
the detection module is used for detecting the data card where the element with the fault is located;
the annotation module annotates the data card where the failed element is located, and disconnects the original failure element;
the load flow calculation module carries out load flow calculation on the power system with the fault element disconnected;
the branch state judgment processing module judges whether an abnormal identified branch is generated according to the result of load flow calculation, and if so, the branch is deleted; otherwise, feeding the result back to the BPA subsystem;
the BPA subsystem processes data of the power system, and whether bus tie spare power automatic switching exists is judged according to whether isolated nodes or subsystems exist in PFO output data or not.
The load flow calculation device further comprises a parameter acquisition module, and the parameter acquisition module is used for acquiring related parameters before load flow calculation.
The BPA subsystem determines the voltage level of an isolated node or subsystem by judging whether the isolated node or subsystem is generated, and judges whether the bus tie spare power automatic switching exists.
When the BPA subsystem judges that the power system has the bus connection spare power automatic switching, the bus connection spare power automatic switching control module switches on a bus connection switch, otherwise, the BPA subsystem deletes the corresponding isolated node or subsystem.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the modeling method and system for the bus tie spare power automatic switching in BPA provided by the invention realize N-1(+1) static safety analysis and loss load calculation considering bus tie spare power automatic switching actions, can accurately simulate corresponding spare power automatic switching actions caused by equipment faults, improve the risk identification accuracy, identify most of power grid operation safety risks and accident hidden dangers, and improve the capacities of power grid operation control departments and personnel and pre-control future potential power grid risks.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a block diagram of the system of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, a modeling method for a bus tie backup automatic switch in BPA includes the following steps:
s1: detecting a data card where a component with a fault is located, annotating the data card, and disconnecting a fault original;
s2: performing load flow calculation, judging whether an abnormal identified branch is generated, and if so, executing step S3; otherwise, go to step S4;
s3: deleting the branch and re-executing step S2;
s4: and carrying out data processing by the BPA, and judging whether an isolated node or a subsystem is generated or not through PFO output data to judge whether bus tie spare power automatic switching exists or not.
More specifically, in step S2, the power flow calculation adopts a calculation method common to the power system, and checks whether the proposed power system planning scheme can meet the requirements of various operation modes.
More specifically, before the load flow calculation, relevant parameters are collected, and whether an abnormally identified branch is generated or not is judged through calculation.
More specifically, the step S3 is used to delete all branches that cannot be normally identified.
More specifically, in step S4, by determining whether an isolated node or a subsystem is generated, the voltage level of the isolated node or the subsystem is determined, and thus, whether the bus tie backup power automatic switching device is available is determined.
More specifically, the modeling method for the bus tie spare power automatic switching device in the BPA further comprises the following steps:
s5: if the bus tie spare power automatic switching is available, the bus tie switch is closed; otherwise, deleting the corresponding isolated node or subsystem.
Example 2
More specifically, on the basis of embodiment 1, as shown in fig. 2, a modeling system for bus tie backup automatic switching in BPA includes a detection module, an annotation module, a load flow calculation module, a branch state judgment processing module, and a BPA subsystem; wherein:
the detection module is used for detecting the data card where the element with the fault is located;
the annotation module annotates the data card where the failed element is located, and disconnects the original failure element;
the load flow calculation module carries out load flow calculation on the power system with the fault element disconnected;
the branch state judgment processing module judges whether an abnormal identified branch is generated according to the result of load flow calculation, and if so, the branch is deleted; otherwise, feeding the result back to the BPA subsystem;
the BPA subsystem processes data of the power system, and whether bus tie spare power automatic switching exists is judged according to whether isolated nodes or subsystems exist in PFO output data or not.
More specifically, the load flow calculation device further comprises a parameter acquisition module, and the parameter acquisition module is used for acquiring relevant parameters before load flow calculation.
More specifically, the BPA subsystem determines the voltage level of an isolated node or subsystem by judging whether the isolated node or subsystem is generated, so that the judgment on whether the bus tie spare power automatic switching exists is realized.
More specifically, the BPA subsystem further comprises a bus tie spare power automatic switching control module, when the BPA subsystem judges that the power system has bus tie spare power automatic switching, the bus tie spare power automatic switching control module switches on a bus tie switch, otherwise, the BPA subsystem deletes the corresponding isolated node or subsystem.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A modeling method for a bus tie spare power automatic switching device on BPA is characterized by comprising the following steps:
s1: detecting a data card where a component with a fault is located, annotating the data card, and disconnecting a fault original;
s2: performing load flow calculation, judging whether an abnormal identified branch is generated, and if so, executing step S3; otherwise, go to step S4;
s3: deleting the branch and re-executing step S2;
s4: and carrying out data processing by the BPA, and judging whether an isolated node or a subsystem is generated or not through PFO output data to judge whether bus tie spare power automatic switching exists or not.
2. The modeling method of a buscouple spare power automatic switching device (BPA) according to claim 1, wherein: in step S2, the power flow calculation adopts a calculation method common to the power system, and checks whether the proposed power system planning scheme can meet the requirements of various operation modes.
3. The modeling method of a buscouple spare power automatic switching device (BPA) according to claim 2, wherein: before the load flow calculation, relevant parameters are collected, and whether an abnormal identified branch is generated or not is judged through calculation.
4. The modeling method of a buscouple spare power automatic switching device (BPA) according to claim 1, wherein: the step S3 is used to delete all branches that cannot be normally identified.
5. The modeling method of a buscouple spare power automatic switching device (BPA) according to claim 1, wherein: in step S4, by determining whether an isolated node or a subsystem is generated, the voltage level of the isolated node or the subsystem is determined, and thus, whether the bus tie backup power automatic switching device is available is determined.
6. The modeling method of a buscouple spare power automatic switching device (BPA) according to claim 5, wherein: further comprising the steps of:
s5: if the bus tie spare power automatic switching is available, the bus tie switch is closed; otherwise, deleting the corresponding isolated node or subsystem.
7. A modeling system for bus tie backup power automatic switching in BPA is characterized in that: the system comprises a detection module, an annotation module, a load flow calculation module, a branch state judgment processing module and a BPA subsystem; wherein:
the detection module is used for detecting the data card where the element with the fault is located;
the annotation module annotates the data card where the failed element is located, and disconnects the original failure element;
the load flow calculation module carries out load flow calculation on the power system with the fault element disconnected;
the branch state judgment processing module judges whether an abnormal identified branch is generated according to the result of load flow calculation, and if so, the branch is deleted; otherwise, feeding the result back to the BPA subsystem;
the BPA subsystem processes data of the power system, and whether bus tie spare power automatic switching exists is judged according to whether isolated nodes or subsystems exist in PFO output data or not.
8. The modeling system of a buscouple backup automatic switching on BPA according to claim 7, wherein: the load flow calculation device further comprises a parameter acquisition module, and the parameter acquisition module is used for acquiring related parameters before load flow calculation.
9. The modeling system of a buscouple backup automatic switching on BPA according to claim 8, wherein: the BPA subsystem determines the voltage level of an isolated node or subsystem by judging whether the isolated node or subsystem is generated, and realizes the judgment of whether the bus tie spare power automatic switching exists.
10. The modeling system of a buscouple backup automatic switching on BPA according to claim 9, wherein: the BPA subsystem is used for judging whether the power system has the bus tie spare power automatic switching or not, and if so, the bus tie spare power automatic switching control module is used for switching on a bus tie switch, otherwise, the BPA subsystem deletes the corresponding isolated node or subsystem.
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