CN112784382B - Simulink simulation-based power distribution network three-level protection setting calculation method - Google Patents
Simulink simulation-based power distribution network three-level protection setting calculation method Download PDFInfo
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- G06F30/18—Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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Abstract
The invention provides a distribution network three-level protection setting calculation method based on Simulink simulation, which is characterized in that a distribution network three-level relay protection coordination model of outgoing line, branch and boundary is established, a switch setting calculation principle of each level is determined, a Matlab callback function is used for enabling a user to input switch parameters, calculation of a called numerical value is realized, a simulation model is established to generate a distribution network topological diagram, and the distribution network topological diagram is generated by judging the matching condition of the switch protection constant value and the protection constant values of switches on and off the level and the switch protection action condition when a fault occurs, and the selection is returned to modify the switch setting calculation principle or the corresponding calculation draft and constant value list is generated to issue a maintenance work area. The invention gets rid of manual calculation, avoids efficiency reduction and accuracy reduction, is convenient for technicians to carry out accounting on calculation correctness, and is beneficial to subsequent analysis and data storage.
Description
Technical Field
The invention relates to the technical field of relay protection setting calculation of a power distribution network of a power system, in particular to a power distribution network three-level protection setting calculation method based on Simulink simulation.
Background
The failure of the power distribution network is an important factor causing the failure and power failure of the power grid. In recent years, with the construction of a power distribution network, the grid structure of the power distribution network is changed greatly, the original power distribution network setting calculation principle is not suitable for the change, and the situations of operation rejection, misoperation, override action and the like occur occasionally. In addition, the number of the power distribution network equipment is increased rapidly, and the power distribution line reconstruction projects are more, so that the problems of frequent parameter change and the like are solved, and the workload of power distribution network relay protection setting calculation and auditing is huge. The efficiency and the accuracy of the relay protection setting calculation of the power distribution network are improved, the method is an important subject currently faced by the relay protection setting calculation major of the power system, and an operable calculation method is urgently needed to improve the fault defense capability of the power distribution network and improve the power supply reliability of the power distribution network.
Disclosure of Invention
In order to achieve the purpose, the invention is realized by the following technical scheme:
a distribution network three-level protection setting calculation method based on Simulink simulation comprises the following steps:
I) establishing a three-level relay protection coordination model of outgoing lines, branches and boundaries of the power distribution network, and determining a setting calculation principle of each level of switches;
II) utilizing a creating tool GUIDE in Matlab to design a GUI and creating a graphical user interface;
III) compiling a Matlab callback function to enable the created user graphical interface to complete calling and numerical value type conversion of the text of the input edit box, creating a formula according to the determined setting calculation principle in the step I), calculating the called numerical value and writing the calculation result into the text box;
IV) collecting switch parameters for power distribution equipment managers, inputting the switch parameters into a corresponding editing frame according to the indication of a static text box of the user graphical interface, starting a callback function through a command button to perform protection constant value calculation on a power distribution network switch, and implementing the execution of the graphical user interface;
v) creating a simulation model by utilizing a PSB power system module library in Simulink, generating a topological graph of the power distribution network, displaying the power distribution network switch in the step IV) on the topological graph, automatically marking the protection constant value calculated in the step IV), and calculating the matching condition of the protection constant value of the switch and the protection constant values of the upper and lower switches of the switch through a compiled callback function, namely whether the constant values are matched or not and whether the time is matched or not; if not, returning to the step I) to modify the switch setting calculation principle; if the matching is carried out, the next step is carried out;
VI) calculating the fault current through a Powergui module, and displaying the action condition of switch protection when a fault occurs through a decision tree algorithm: if the switches at all levels have incorrect actions, returning to the step I) of modifying the switch setting calculation principle, wherein the incorrect actions comprise misoperation, refusal action and override action; if the switch actions are normal, the fault can be isolated in a minimum range, namely the first switch protection action at the upstream of the fault point trips, and the other switches normally operate, and then a corresponding calculation draft and a fixed value list are generated;
VII) sending the fixed value list to a maintenance work area.
Further, the setting calculation principle in the step I comprises the number of protection sections, the protection range and the action time of each section of protection, and the matching coefficient of the upper and lower protection constant values.
Further, the GUI design in the step II comprises a parameter input and calculation result visualization display module.
Further, the switching parameters in the step IV include the actual load of the distribution switch, the impedance of the connected bus, the length and type of the bus-to-switch conductor, and the protection CT transformation ratio.
Further, modifying the switch setting calculation principle in step V includes adjusting the priority or the superior-inferior matching coefficient of each calculation principle.
The invention has the advantages that: the method not only gets rid of manual calculation, avoids efficiency reduction and accuracy reduction, but also can ensure the upper and lower level coordination of the fixed value, carries out simulation on fault conditions, is convenient for technical personnel to carry out accounting on calculation correctness, and is beneficial to subsequent analysis and data storage.
According to the invention, the defense capacity of the power distribution network is improved through the calculation method of grading detection and simulation fault, the workload of technical personnel is reduced, and the power supply reliability of the whole power distribution network is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic flow chart of example 1 of the present invention;
FIG. 2 is a distribution network switch topology diagram in embodiment 1;
fig. 3 is a distribution network switch topology diagram simulating the occurrence of a fault in embodiment 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A power distribution network three-level protection setting calculation method based on Simulink simulation comprises the following steps:
s1, establishing a three-level relay protection coordination model of 'outgoing line + branch + boundary' of the power distribution network, and dividing the model into three modules: the method comprises the steps of setting calculation of a protection fixed value of an outgoing switch of a transformer substation, setting calculation of a protection fixed value of a branch switch and setting calculation of a protection fixed value of a boundary switch, wherein the setting calculation of the protection fixed value of the branch switch is mainly realized by developing a three-level protection setting calculation system of a power distribution network by utilizing matlab programming, and the setting calculation principle of each level of switch is clear and comprises the number of protection stages, the protection range and the action time of each stage of protection, the matching coefficient of upper and lower level protection fixed values and the like.
S2 utilizes creating tool GUIDE in Matlab to design GUI, creates a user graphic interface, provides an edit box for parameter input and a calculation result visualization display module, takes the transformer substation outlet switch as an example, and the user inputs the data of switch parameters (such as the actual load of the distribution switch, the impedance of the connected bus, the length and the model of the bus to the switch wire, the capacity of all the distribution transformers, the main transformer low backup time limit quick break, the main transformer low backup overcurrent, the protection CT transformation ratio and the measurement CT transformation ratio) into the appointed edit box according to the indication of the GUI static text box.
S3, writing a Matlab callback function, enabling the created user graphical interface to complete calling and numerical value type conversion of the text of the input edit box, creating a formula according to the determined setting calculation principle in the step 1, calculating the called numerical value, and writing the calculation result into the text box.
S4 collecting switch parameters for power distribution equipment manager, inputting the switch parameters to the corresponding edit box according to the instruction of the user graphic interface static text box, starting the callback function through the command button to calculate the protection fixed value of the power distribution network switch, implementing the execution of the graphic user interface, and displaying the protection fixed values of quick break, time-limited quick break, overcurrent and overload.
S5, creating a simulation model by utilizing a PSB power system module library in Simulink, enabling a user to click a command button to start generating a distribution network topological graph, displaying the distribution network switch in the step 4 on the topological graph, and automatically marking the protection constant value calculated in the step 4, as shown in FIG. 2; calculating the matching condition of the switch protection constant value and the protection constant values of the switches at the upper and lower stages through the compiled callback function, and judging whether the constant values are matched or not and whether the time is matched or not; if not, returning to the step 1 to modify the switch setting calculation principle; if the two components are matched, the next step is carried out.
S6, calculating fault current through a Powergui module, setting a fault point for multiple times to simulate the action condition of switch protection when a fault occurs, displaying the action condition of switch protection when the fault occurs through a decision tree algorithm, and returning to the step 1 to modify the switch setting calculation principle if each stage of switch has incorrect action conditions (such as misoperation, refusal action and override action); if the switch actions are normal, the fault can be isolated in a minimum range, namely the first switch protection action at the upstream of the fault point trips, and the other switches normally operate, and then a corresponding calculation draft and a fixed value list are generated.
S7 shows in the simulation example shown in fig. 3, when the switching of each stage of the distribution network operates normally, and after there is no error in multiple simulations, the set setting rule of each stage of the switching protection and the calculated protection setting value are considered to be correct, and a corresponding calculation draft and a corresponding setting value sheet can be generated, and an operation and maintenance unit can issue an actual site to execute a corresponding setting value.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A distribution network three-level protection setting calculation method based on Simulink simulation is characterized by comprising the following steps:
I) establishing a three-level relay protection coordination model of outgoing line, branch and boundary of the power distribution network, and determining a setting calculation principle of each level of switch, wherein the setting calculation principle comprises the number of protection stages, the protection range and the action time of each stage of protection, and a coordination coefficient of upper and lower level protection fixed values;
II) utilizing a creating tool GUIDE in Matlab to design a GUI and creating a graphical user interface;
III) compiling a Matlab callback function to enable the created user graphical interface to complete calling and numerical value type conversion of the text of the input edit box, creating a formula according to the determined setting calculation principle in the step I), calculating the called numerical value and writing the calculation result into the text box;
IV) collecting switch parameters for power distribution equipment managers, inputting the switch parameters into a corresponding editing frame according to the indication of a static text box of the user graphical interface, starting a callback function through a command button to perform protection constant value calculation on a power distribution network switch, and implementing the execution of the graphical user interface;
v) creating a simulation model by utilizing a PSB power system module library in Simulink, generating a topological graph of the power distribution network, displaying the power distribution network switch in the step IV) on the topological graph, automatically marking the protection constant value calculated in the step IV), and calculating the matching condition of the protection constant value of the switch and the protection constant values of the upper and lower switches of the switch through a compiled callback function, namely whether the constant values are matched or not and whether the time is matched or not; if not, returning to the step I) to modify the switch setting calculation principle; if the matching is carried out, the next step is carried out;
VI) calculating the fault current through a Powergui module, and displaying the action condition of switch protection when a fault occurs through a decision tree algorithm: if the switches at all levels have incorrect actions, returning to the step I) of modifying the switch setting calculation principle, wherein the incorrect actions comprise misoperation, refusal action and override action; if the switch actions are normal, the fault can be isolated in a minimum range, namely the first switch protection action at the upstream of the fault point trips, and the other switches normally operate, and then a corresponding calculation draft and a fixed value list are generated;
VII) sending the fixed value list to a maintenance work area.
2. The Simulink simulation-based power distribution network three-level protection setting calculation method of claim 1, wherein the setting calculation principle in step I comprises the number of protection stages, the protection range and the action time of each stage of protection, and the matching coefficient of the upper and lower stage protection fixed values.
3. The Simulink simulation-based distribution network tertiary protection setting calculation method of claim 1, wherein the GUI design in step II comprises a parameter input and calculation result visualization display module.
4. The Simulink simulation-based power distribution network three-level protection setting calculation method according to claim 1, wherein the switching parameters in step IV include actual load of a distribution switch, impedance of a connected bus, length and type of a bus-to-switch conductor, and protection CT transformation ratio.
5. The Simulink simulation-based power distribution network tertiary protection setting calculation method of claim 1, wherein the step V of modifying the switch setting calculation rule comprises adjusting a priority or an upper and lower matching coefficient of each calculation rule.
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| CN109858828A (en) * | 2019-02-22 | 2019-06-07 | 国家电网有限公司 | A kind of power distribution network definite value automatic setting method, device and distribution network systems |
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| CN109101714A (en) * | 2018-08-02 | 2018-12-28 | 云南电网有限责任公司昆明供电局 | A method of verifying protective relaying device logic function |
| CN109343337B (en) * | 2018-10-24 | 2021-06-25 | 温州大学 | Multi-target fractional order PID control method for DC buck converter |
| CN111799790A (en) * | 2020-07-16 | 2020-10-20 | 广东电网有限责任公司 | Method for configuring setting principle of power distribution network system |
| CN112234611B (en) * | 2020-09-30 | 2023-03-21 | 国网河南省电力公司电力科学研究院 | Power distribution network setting calculation method and system based on computer modeling |
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