CN112183004B - CDEGS-based power grid induced voltage analysis method - Google Patents
CDEGS-based power grid induced voltage analysis method Download PDFInfo
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- 238000004458 analytical method Methods 0.000 title claims abstract description 18
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- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
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- 239000004020 conductor Substances 0.000 claims description 20
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- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
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- G06F30/30—Circuit design
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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- G—PHYSICS
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Abstract
The invention discloses a CDEGS-based power grid induced voltage analysis method, which comprises the steps of creating a subway-power grid coupling system project by utilizing light-of-Way; defining a central station and path items; defining an attribute setting item; defining a terminal project; creating a circuit model of the subway-power grid coupling system; selecting influence factors to simulate the induced voltage; envelope information is respectively extracted from different tower sections of each circuit of the circuit model, quantitative data of the induction voltage of the power grid are obtained, and summarizing and comparing are respectively carried out. By adopting the embodiment of the invention, the problems of blindness in protection of power grid equipment and poor effect caused by insufficient analysis of electromagnetic coupling relation in the prior art can be effectively solved.
Description
Technical Field
The invention relates to the technical field of urban rail transit, in particular to a CDEGS-based power grid induced voltage analysis method.
Background
Because the subway has smaller power and adopts a direct current-alternating current transmission mode, most of subways are rectified by a traction substation in a transformation way through 110/35kV alternating current, and the voltage of DC1500/750V of the electric locomotive is supplied to the electric locomotive for operation through a traction network. Direct current is directly injected into the ground, so that the ground surface potential (ESP) is distorted, when a large potential difference exists between two substations, a loop is generated between the substations and a power transmission line, current invades a transformer, and when the current invades the transformer seriously, the transformer near the grounding electrode can generate large-scale direct current magnetic bias, so that the current invades power grid equipment, the harmonic content of a power grid is increased, and the safe operation of the transformer and even the power grid is influenced.
The electromagnetic field coupling between the contact net and the power grid is caused by mutual inductance between the two circuits, so that the current change of one circuit affects the other circuit through the mutual inductance. Therefore, the current change of the overhead line system generates an alternating electromagnetic field, and voltage is induced on the power transmission line, so that direct current is generated to enable the transformer to generate direct current magnetic bias. However, at present, no effective method and means for analyzing the electromagnetic coupling relation between the subway contact network and the power transmission line under the influence of the urban rail transit system exist, the protection of the power grid equipment is blind and has poor effect, and the safe operation of the power grid is seriously influenced.
Disclosure of Invention
The embodiment of the invention provides a CDEGS-based power grid induced voltage analysis method, a CDEGS-based power grid induced voltage analysis device and a computer-readable storage medium, which can effectively solve the problems of blindness in protection of power grid equipment and poor effect caused by insufficient analysis of electromagnetic coupling relations in the prior art.
An embodiment of the present invention provides a CDEGS-based power grid induced voltage analysis method, including:
creating a subway-power grid coupling system project by using Right-of-Way;
defining a central station and path items;
defining an attribute setting item;
defining a terminal project;
creating a circuit model of the subway-power grid coupling system;
selecting influence factors to simulate the induced voltage;
envelope information is respectively extracted from different tower sections of each circuit of the circuit model, quantitative data of the induction voltage of the power grid are obtained, and summarizing and comparing are respectively carried out.
As an improvement of the above scheme, the influencing factors specifically include: parallel length of the power grid, relative displacement difference value, different height lines of the power grid system, and sizes of contact net and return rail current sources.
As an improvement of the above solution, the defining the central station and the path item specifically includes:
defining the name of the central station and the total number of phase lines, and setting the grounding impedance value of the central station as a larger value;
two paths are defined, namely a subway contact network path and an overhead line path.
As an improvement of the above-described aspect, the definition attribute setting item specifically includes:
defining a conductor characteristic in each line path and a relative position of the satellite conductor in each path;
phase line leakage, state are defined to define the shunt impedance and state of the phase line.
As an improvement of the above solution, the defining terminal items specifically includes:
defining a terminal name and a terminal structure;
by the excitation option, the terminal ground impedance, the resistive reactance of each phase line, the ground voltage, and the source current are set.
As an improvement of the above scheme, the circuit model of the subway-power grid coupling system specifically includes:
the grounding resistance at two ends of the line is in information of equivalent series impedance, equivalent shunt impedance, connection impedance and trans-impedance of a current voltage source and different areas of different terminals.
The selection of the influencing factors for the induced voltage simulation is realized by the operation of a SPLITS module of the CDEGS.
Compared with the prior art, the CDEGS-based power grid induced voltage analysis method provided by the embodiment of the invention is used for carrying out simulation analysis based on CDEGS simulation software in the aspect of the influence of the mutual electromagnetic fields between the subway overhead line system and the power transmission line system, and mainly analyzing the influence of various factors on the power grid induced voltage under the action of the subway overhead line system, including but not limited to the parallel length and the relative displacement difference of the power grid, the current of different-height lines of the power grid system and the overhead line system and the current of the reflux rail. The graph of the induced voltage is obtained through CDEGS software, qualitative analysis is carried out on the voltage at each tower under different conditions, then the envelope information is respectively extracted from different tower sections, quantitative data of the induced voltage of the power grid are obtained, the change rule of the induced voltage along with influence factors is analyzed, and further perfect protection measures on power grid equipment under different influence conditions can be aimed, and the safe operation of the power grid is ensured.
Drawings
FIG. 1 is a schematic flow chart of a CDEGS-based power grid induced voltage analysis method according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a subway-grid coupling system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a method for analyzing a power grid induced voltage based on CDEGS, where the method includes:
s10, creating a subway-power grid coupling system project by using Right-of-Way.
S11, defining a central station and path items.
S12, defining an attribute setting item.
S13, defining a terminal project.
S14, creating a circuit model of the subway-power grid coupling system.
S15, selecting influence factors to perform induction voltage simulation.
S16, respectively extracting envelope information from different tower sections of each circuit of the circuit model to obtain quantitative data of the induction voltage of the power grid, and respectively summarizing and comparing.
The system structure is created by using Right-of-Way, and the software has eight main integrated modules in total. Project management, setting and frequency & unit module, mainly processing project management in all aspects: modifying the parameter limits; setting public system data, and the like. The build system module is the core of the ROW to build a common corridor model. The creation circuit module is used to build an initial power network model for subsequent calculations, automatically provide the required line parameters and generate files that can be used by the SPLITS module. And modifying the circuit module by extracting and modifying the SPLITS input file. The monitor fault module allows a user to automatically simulate a fault along the transmission line. The total interference module may calculate a conducted interference component and a sum of the sensed and conducted components. The processing module calculates voltage and current profiles that are commonly affected by induction and conduction in the event of a load or fault. The graphics and report module calls the SPLITS module in CDEGS to check the output condition.
After the subway-grid coupling system project and scheme are created, the first step is to set up a unit system used in the ROW model to use metric or english, then define the power system frequency by the system frequency, and can input some remarks in the scheme description. In addition, the Right-of-Way software also needs to define a central station and a path, set attributes and three items of terminals. The central station and the central station defined by the path are the locations where the study is performed, and the central station is connected with the terminals through the power lines and the metal pipes. The path refers to a conductor combination which is kept at a fixed distance from each other in the range of a shared corridor, and can be divided into a main path and a basic path. The attribute setting defines the relative height and horizontal displacement of each conductor on its own path, and the type and model of the conductor. The termination settings define the ground impedance of the termination and the excitation state of each bus bar.
Compared with the prior art, the CDEGS-based power grid induced voltage analysis method provided by the embodiment of the invention is used for carrying out simulation analysis based on CDEGS simulation software in the aspect of the influence of the mutual electromagnetic fields between the subway overhead line system and the power transmission line system, and mainly analyzing the influence of various factors on the power grid induced voltage under the action of the subway overhead line system, including but not limited to the parallel length and the relative displacement difference of the power grid, the current of different-height lines of the power grid system and the overhead line system and the current of the reflux rail. The graph of the induced voltage is obtained through CDEGS software, qualitative analysis is carried out on the voltage at each tower under different conditions, then the envelope information is respectively extracted from different tower sections, quantitative data of the induced voltage of the power grid are obtained, the change rule of the induced voltage along with influence factors is analyzed, and further perfect protection measures on power grid equipment under different influence conditions can be aimed, and the safe operation of the power grid is ensured.
Illustratively, S11 specifically includes:
defining the name of the central station and the total number of phase lines, and setting the grounding impedance value of the central station as a larger value;
two paths are defined, namely a subway contact network path and an overhead line path.
And when the central station and the path are defined, the central station information is defined according to the theoretical design. Typically, the central station is the location where the short circuit fault occurs. The simulation of the embodiment of the invention does not relate to the fault condition, so that all phase lines of the central station are open circuits, and the grounding impedance value of the central station is set to be a larger value. The name of the central station is defined as MeterStation, 9 is entered in the total number of phase lines and set according to the parameters shown in Table 1.
Table 1 defines the phase lines
Two paths are defined, namely a subway contact network path and an overhead line path. The subway contact net line comprises a contact net and a return rail, and the overhead line comprises six power lines and two overhead ground wires. The conductor names and their phase line numbers are shown in table 2:
table 2 defines the path
Illustratively, S12 specifically includes:
defining a conductor characteristic in each line path and a relative position of the satellite conductor in each path;
phase line leakage, state are defined to define the shunt impedance and state of the phase line.
The characteristics of all the line paths are defined by the attribute settings. Which may define the conductor characteristics in each line path and the relative positions of the satellite conductors in each path. The last term of attribute setting is to define the phase line leakage, state to define the shunt impedance and state of the phase line. The virtual state of the phase lines can also be set at the interface, and if one phase line is set as virtual, the series impedance is a very large value. The embodiment of the invention selects the true value for calculation. The overhead line system wire parameter overhead line system of a subway project in a certain place selects CTAH150, and the reflux rail selects CHN60. The high-voltage line is selected from LGJ-300/25, and according to GB 5045-2010 110 KV-750 KV overhead transmission line design specification scheme 5.0.12, when the lead is in the range of LGJ-185/45-LGJ 400/35, the lightning conductor can be selected from galvanized steel stranded wires by 50mm. Specific settings are shown in tables 3 and 4 below.
TABLE 3 wire attributes
TABLE 4 principal conductor parameters
| Conductor type | Model number | Relative resistivity | Relative permeability of | Equivalent radius (mm) |
| Overhead high-voltage line | LGJ-300/25 | 2.235 | 1 | 11.88 |
| Lightning conductor | GJ-50 | 10 | 300 | 4.5 |
| Contact wire | CTAH150 | 0.672 | 0.99 | 6.91 |
| Rail for rail | CHN60 | 5.19 | 300 | 49.6 |
Illustratively, S13 specifically includes:
defining a terminal name and a terminal structure;
by the excitation option, the terminal ground impedance, the resistive reactance of each phase line, the ground voltage, and the source current are set.
When defining the Terminal excitation and region, in the Terminal tag, terminal one is named terminal_1. By the excitation option, the terminal ground impedance, the resistive reactance of each phase line, the ground voltage, and the source current can be set.
Table 5 defines the excitation source of terminal 1
In steady state conditions we focus on inductive coupling between transmission lines and pipes. The use of a current source can ensure that the phase conductors have specific load current values, and the self-impedance of the transmission line and the coupling between the phase conductors do not affect the steady-state current. The whole circuit is regarded as a loop plus a current source, and no excitation is applied to the other terminal.
A region with a short line length and only a subway contact net and no overhead line is defined at the terminal 1. The number of soil distribution layers can be set in defining the soil type, with a default value of 100 ohm-meters. And changing the conductor attribute setting, and changing the states of 7 lines to which the overhead transmission line belongs into virtual states. When the terminal 2 is defined, two areas are input. The resistance reactance of the return rail of the overhead contact system is set to be 0 ohm through setting excitation, and the rest lines are disconnected from the terminals. So that current flows from terminal 1 to terminal 2.
Table 6 defines the excitation source of terminal 2
Then, define the area 1 again, need to fill out the line length and soil impedance according to the real situation. When defining the area 2, the number of segments between the current point and the next point and the number of towers per segment may be defined according to the actual situation. The next step is to define a basic path for the overhead line, and the position relation between the subway and the power grid in a real complex state can be simulated by defining the path.
After the data entry work for the shared corridor is completed, the structure of the entire shared corridor is drawn to see the accuracy of the entered data. Since the entire shared corridor is defined in the terminal 2, clicking the draw network button after selecting the terminal 2, selecting both terminals and clicking the display, then displaying the structure of the shared corridor to be studied in the sescd procedure.
Illustratively, the circuit model of the subway-grid coupling system in S14 specifically includes:
the grounding resistance at two ends of the line is in information of equivalent series impedance, equivalent shunt impedance, connection impedance and trans-impedance of a current voltage source and different areas of different terminals.
Referring to fig. 2, a schematic circuit diagram of a coupling system is shown. The lightning conductor, the PHASEA2, the PHASEB2, the PHASEC1, the PHASEB1, the PHASEA1 and the equivalent circuit schematic diagrams of the contact network and the return rail can be seen from top to bottom. The current in the contact net and the return rail is always 1.4kA, and each circuit of the power system is equivalent to a wire which is not grounded for subsequent data analysis.
Since the latter simulation will analyze the influence of different factors on the induced voltage of the grid, the variable here is the parallel length of the grid system. Only the voltage level of the PHASEA1 phase (20 meters in height, 10 meters in horizontal relative displacement difference) is considered here.
Illustratively, after modeling, influencing factors are selected for induced voltage simulation. And obtaining a result diagram through the SPLITS module, and qualitatively analyzing the influence of specific factors on the induction voltage of the power grid under the action of the subway contact network system through the result diagram. But later quantitative analysis is also required, so that the overall value of the envelope can be extracted by ROW. After running the SPLITS model with a sesbach or other tool, the process obtains the induction envelope data for the defined target phase line.
And then, automatically generating an Excel graph of the detection variable which is established along the direction of the shared corridor and is changed along with a specific factor by drawing by using an Excel tool. The Excel table file contains the specific induction voltage of each point of the power grid system, so that quantitative analysis can be performed on the system change. And selecting A1 phase line data, recording the magnitude and list of the induction voltage of the power grid system under the condition of specific factors of the power grid.
It should be noted that the drawing software includes, but is not limited to Excel.
Illustratively, the influencing factors include, but are not limited to, grid parallel length, relative displacement difference, different height lines of the grid system, and sizes of catenary and return rail current sources.
Compared with the prior art, the CDEGS-based power grid induced voltage analysis method provided by the embodiment of the invention is used for carrying out simulation analysis based on CDEGS simulation software in the aspect of the influence of the mutual electromagnetic fields between the subway overhead line system and the power transmission line system, and mainly analyzing the influence of various factors on the power grid induced voltage under the action of the subway overhead line system, including but not limited to the parallel length and the relative displacement difference of the power grid, the current of different-height lines of the power grid system and the overhead line system and the current of the reflux rail. The graph of the induced voltage is obtained through CDEGS software, qualitative analysis is carried out on the voltage at each tower under different conditions, then the envelope information is respectively extracted from different tower sections, quantitative data of the induced voltage of the power grid are obtained, the change rule of the induced voltage along with influence factors is analyzed, and further perfect protection measures on power grid equipment under different influence conditions can be aimed, and the safe operation of the power grid is ensured.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (2)
1. A CDEGS-based power grid induced voltage analysis method, comprising:
creating a subway-power grid coupling system project by using Right-of-Way;
defining a central station and path items;
defining an attribute setting item;
defining a terminal project;
creating a circuit model of the subway-power grid coupling system;
selecting influence factors to simulate the induced voltage;
envelope information is respectively extracted from different tower sections of each circuit of the circuit model to obtain quantitative data of the induction voltage of the power grid, and the quantitative data are respectively summarized and compared;
the defining the central station and the path item specifically comprises the following steps:
defining the name of the central station and the total number of phase lines, and setting the grounding impedance value of the central station as a larger value;
defining two paths, namely a subway overhead contact line path and an overhead line path;
wherein, the definition attribute setting item specifically includes:
defining a conductor characteristic in each line path and a relative position of the satellite conductor in each path;
defining the leakage and state of the phase line to define the shunt impedance and state of the phase line;
the defining terminal items specifically includes:
defining a terminal name and a terminal structure;
setting terminal grounding impedance, resistance reactance of each phase line, grounding voltage and source current through excitation options;
the circuit model of the subway-power grid coupling system specifically comprises the following components:
the information of the equivalent series impedance, equivalent shunt impedance, connecting impedance and transimpedance of the grounding resistance at the two ends of the line, the current and voltage source, and different areas of different terminals;
wherein, the influencing factors specifically include: parallel length of the power grid, relative displacement difference value, different height lines of the power grid system, and sizes of contact net and return rail current sources.
2. The CDEGS-based power grid induced voltage analysis method according to claim 1, wherein the selecting the influencing factors to perform the induced voltage simulation is implemented by calculating SPL ITS modules of the CDEGS.
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