CN108334684B - VFTO modeling analysis method in opening and closing process of isolating switch - Google Patents
VFTO modeling analysis method in opening and closing process of isolating switch Download PDFInfo
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Abstract
VFTO modeling analysis method in opening and closing process of isolating switchThe method comprehensively considers each influence factor in the opening and closing process of the isolating switch, so that the simulation circuit is closer to the reality. The circuit diagram elements include a power source u, a power source side line internal resistance RuPower supply side line inductor LuStray capacitance C to ground at power port and power connecting lineu1And Cu2Disconnecting switch DS, left and right sides of disconnecting switch stray capacitance to ground C1And C2Equivalent resistance and equivalent inductance R of connecting line between isolating switch and load capacitorLAnd LLCapacitance value, equivalent resistance and equivalent inductance value C, R, L of load capacitor, ground resistance r of power supply side and load capacitor side1And r2And arc resistance and port capacitance r (t) and c (t) between ports in the opening and closing process of the isolating switch. According to the modeling analysis method provided by the invention, the modeling simulation result not only is that the whole waveform is consistent with the actual test waveform, but also the waveform of the transient attenuation process is consistent with the actual test result, so that the accuracy of the modeling analysis method provided by the invention is verified.
Description
Technical Field
The invention relates to a VFTO (very fast transient overvoltage) modeling analysis method in the opening and closing process of an isolating switch, which is used for modeling and analyzing parameters such as VFTO amplitude, phase, frequency and the like in the opening and closing process of the isolating switch.
Background
The VFTO (very fast transient overvoltage) phenomenon is a phenomenon which often occurs in the operation process of an isolating switch, a circuit breaker and the like in a power system, the pulse edge rise time of the VFTO (very fast transient overvoltage) phenomenon is short, the frequency is high, the amplitude is large, and the damage to primary and secondary equipment of the power system cannot be ignored. At present, many researches have been made for the VFTO problem in the opening and closing process of the isolating switch, however, the modeling analysis method for the opening and closing process of the isolating switch is simple at present, the transient phenomenon in the opening and closing process of the isolating switch cannot be accurately reflected, the comparison between the simulation model and the output result and the actually measured waveform is also less, and particularly, the simulation and actual measurement for the transient voltage and current waveform, the amplitude, the frequency and the like in the opening and closing process of the isolating switch are less, so that the accuracy of the established model cannot be determined.
Patent CN: 106845030A provides a modeling method for influence of VFTO on an air coil electronic transformer, which can realize calculation of influence level of the VFTO on the air coil electronic transformer. However, the emphasis is on modeling the air coil electronic transformer, and the patent is not concerned about how the generation source of the VFTO is modeled and how accurately the VFTO is modeled to obtain a VFTO model consistent with actual tests.
Patent CN: 106709143A provides a VFTO batch simulation analysis method and system based on automatic modeling of ATP, which realizes batch simulation of a plurality of GIS stations by reading and storing an original ATP simulation model file describing GIS station steady state information into a database, analyzing and modifying the file. However, how to build the original ATP simulation model of a single GIS station and compare the simulation output after modeling with the measured result are not referred to in the patent.
Disclosure of Invention
Aiming at the current situations that a simulation model of the opening and closing process of the isolating switch is simple, the whole opening and closing process of the isolating switch cannot be reflected, and modeling analysis and test comparison on VFTO in the opening and closing process of the isolating switch are lacked, the invention provides the VFTO modeling analysis method in the opening and closing process of the isolating switch, which comprehensively considers the influences of factors such as a power port equivalent capacitor, stray capacitors to the ground at two sides of the isolating switch, a load capacitor equivalent resistor and an equivalent inductance value, ground resistors at a power side and a load side, an arc resistor and an equivalent capacitor in the opening and closing process of the isolating switch, and the like, so that a simulation result is closer to an actual test result, and the actual situation can be reflected better.
The technical scheme adopted by the invention is as follows:
a VFTO modeling analysis method in the opening and closing process of an isolating switch comprises a circuit simulation model in the opening and closing process of the isolating switch, wherein the circuit simulation model comprises the following steps:
a power supply u,
Internal resistance R of power supply side lineu、
Power supply side line inductance Lu、
Stray capacitance C of power port to groundu1、
Stray capacitance to ground C at power connection lineu2、
A disconnecting switch DS,
Stray capacitance C to ground on the left side of the isolating switch DS1、
Stray capacitance C to ground on right side of isolating switch DS2、
Equivalent resistor R of connecting line between isolating switch DS and load capacitor CL、
Equivalent inductance L of connecting line between isolating switch DS and load capacitor CL、
A load capacitance C,
An equivalent resistance R,
An equivalent inductance L,
Grounding resistor r on side u of power supply1、
Grounding resistor r on C side of load capacitor2、
Arc resistance r (t) between ports in the opening and closing process of the disconnecting switch DS,
Port capacitance c (t) in the opening and closing process of the isolating switch DS;
one end of the power supply u is connected with the internal resistance R of the power supply side lineuOne end, power supply side line internal resistance RuThe other end is connected with a power supply side line inductor LuOne end, power supply side line inductance LuThe other end of the isolating switch DS is connected with one end of an isolating switch DS, the other end of the isolating switch DS is connected with one end of an arc resistor R (t), and the other end of the arc resistor R (t) is connected with the equivalent resistor RLOne end, the equivalent resistance RLThe other end is connected with an equivalent inductor LLEquivalent inductance LLOne end of a load capacitor C is connected, and the other end of the load capacitor C is connected with the grounding resistor r2One end of the ground resistor r2The other end is grounded;
the other end of the power supply u is respectively connected with: the grounding resistor r1Stray capacitance C of one end and power supply port to groundu1Stray capacitance C to ground at the other end and power connection lineu2The other end of the capacitor is a stray capacitor C to the ground at the left side of the isolating switch DS1The other end of the capacitor is a stray capacitance C to the ground at the right side of the isolating switch DS2The other end of the load capacitor C;
the power supply port is connected with a stray capacitor C to the groundu1One end is connected with the internal resistance R of the power supply side lineuAt one end of the first and second connecting rods,
stray capacitance C to ground at the power connection lineu2One end is connected with a power supply side line inductor LuThe other end of the first tube is provided with a first end,
the left side of the isolating switch DS is connected with the stray capacitance C to the ground1One end of the switch is connected with one end of the isolating switch DS,
the stray capacitance C to the ground at the right side of the isolating switch DS2One end of the resistor is connected with the equivalent resistor RLAt one end of the first and second connecting rods,
the grounding resistor r1The other end is grounded,
one end of the isolating switch DS is connected with one end of the port capacitor c (t), the other end of the port capacitor c (t) is connected with the other end of the arc resistor r (t),
the equivalent resistor R is connected with a load capacitor C in parallel, and the load capacitor C is connected with the equivalent inductor L in parallel.
Compared with the existing common simulation model of the opening and closing process of the isolating switch, the model is closer to the actual wiring condition, so that the simulation result is more consistent with the waveform of the test result, and the simulation result is embodied in the following points:
1) the equivalent capacitance C of the power port is consideredu1Since the connection line from the power port to the isolating switch has a certain distance, C needs to be consideredu1The influence of (a);
2) the stray capacitance to ground at two sides of the isolating switch is considered, and because the isolating switch generates high-frequency signals in the opening and closing process, the capacitive reactance of the stray capacitance to ground is very small under the condition that the capacitance of the stray capacitance to ground is very small, and the stray capacitance to ground cannot be replaced by an open circuit;
3) the equivalent resistance and the equivalent inductance value of the load capacitor are considered;
4) the influence of the grounding resistors on the power supply side and the load side is considered;
5) the arc reignition and extinction in the opening and closing process of the isolating switch are not simply considered as the opening and the disconnection of the switch, but the influence of arc resistance and equivalent capacitance is considered in the process of the arc reignition and extinction. At present, during general modeling, the arc reignition is regarded as the switch is closed, the resistance is generally considered to be 0, and the phenomenon that the arc resistance changes along with time is considered, and the phenomenon that the equivalent capacitance between two ports of the isolating switch changes along with time is also considered, so that a simulation result is closer to the actual situation.
The VFTO modeling analysis method in the opening and closing process of the isolating switch comprises the following steps:
step 1: setting simulation circuit model parameters including voltage, each resistor, each inductor and each capacitance value according to the model and the opening and closing speed of the actual isolating switch; especially, the equivalent capacitance of the power port and the stray capacitance C to the ground at the left side of the isolating switch DS are considered1And stray capacitance C to ground at right side of isolating switch DS2Equivalent resistance R, equivalent inductance L, grounding resistance R at power supply u side1And the grounding resistor r on the C side of the load capacitor2The parameters can be calculated according to the actually used power source u, the isolating switch DS, the load capacitor C type and the like, and the size of the grounding resistance is obtained by measuring an actual circuit;
step 2: setting simulation step length: the interval time set by the simulation step length is short enough, and the general time is less than
Here taken to be 1ns or less.
And step 3: the reignition or extinction process of the arc of the disconnecting switch DS takes into account a time-varying model of the arc resistance r (t) and a time-varying model of the port capacitance c (t) of the disconnecting switch DS. In the reignition or extinguishment process of the electric arc of the isolating switch, a time-varying model of the electric arc resistance and a time-varying model of equivalent capacitors at two ends of the isolating switch need to be considered instead of simple switching on or switching off of the switch, and the value mode is shown in formulas (1) and (2).
The arc resistance r (t) and the port capacitance c (t) between the ports in the opening and closing process of the isolating switch DS are expressed as follows:
r(t)＝r0(1+a*e-t/b) (1)
c(t)＝c0*k*t (2)
in the above formulas (1) and (2), r0The initial resistance is generally less than 1 omega; c. C0The initial capacitance is obtained by taking the value as pF level; a. b and k are corresponding coefficients respectively, wherein the value of a is generally 106Level, b generally takes the value of 10-9The value of the level k can be changed according to the opening and closing speed of the isolating switch, and practically can be 1.
The expressions of the arc resistance and the port capacitance value between the ports in the opening and closing process of the isolating switch are as follows: r (t) ═ r0(1+a*e-t/b) And c (t) ═ c0K t. The arc resistance and the port capacitance both adopt time-varying models, so that the change conditions of relevant parameters of the arc channel in the opening and closing process can be reflected more truly, and the analysis result is more accurate.
The invention discloses a VFTO modeling analysis method in the process of opening and closing an isolating switch, which has the following technical effects:
1) the influence of factors such as equivalent capacitance of a power port, stray capacitance of two sides of the isolating switch to the ground, equivalent resistance and equivalent inductance of a load capacitor, grounding resistance of a power side and a load side, self arc resistance and equivalent capacitance in the opening and closing process of the isolating switch and the like is comprehensively considered, so that a simulation result is closer to an actual test result;
2) the arc resistance and the port capacitance between the ports in the opening and closing process of the isolating switch adopt time-varying models, so that the change condition of relevant parameters of an arc channel in the opening and closing process can be reflected more truly, and the analysis result is more accurate;
3) according to the modeling analysis method provided by the invention, the modeling simulation result not only is that the whole waveform is consistent with the actual test waveform, but also the waveform of the transient attenuation process is consistent with the actual test result, so that the accuracy of the modeling analysis method provided by the invention is verified.
Drawings
Fig. 1(a) is a circuit diagram of a simulation model of an opening and closing process of a currently common disconnecting switch.
Fig. 1(b) is a circuit model for simulating the opening and closing process of the isolating switch in the invention.
FIG. 2 is a flow chart of simulation in the invention.
Fig. 3(a) is a simulation result of a common model.
FIG. 3(b) is a diagram of simulation results for the model provided by the present invention.
Fig. 3(c) is a graph of the actual test results.
Fig. 3(d) is an enlarged view of the waveform of fig. 3 (a).
Fig. 3(e) is an enlarged view of the waveform of fig. 3 (b).
Fig. 3(f) is an enlarged view of the waveform of fig. 3 (c).
FIG. 4 is a diagram of ATPDraw-based process according to the present invention.
Detailed Description
The VFTO modeling analysis method in the opening and closing process of the isolating switch comprises a simulation circuit model of the opening and closing process of the isolating switch, as shown in fig. 1(b), wherein the simulation circuit model comprises:
a power supply u,
Internal resistance R of power supply side lineu、
Power supply side line inductance Lu、
Stray capacitance C of power port to groundu1、
Stray capacitance to ground C at power connection lineu2、
A disconnecting switch DS,
Stray capacitance C to ground on the left side of the isolating switch DS1、
Stray capacitance C to ground on right side of isolating switch DS2、
Equivalent resistor R of connecting line between isolating switch DS and load capacitor CL、
Equivalent inductance L of connecting line between isolating switch DS and load capacitor CL、
A load capacitance C,
An equivalent resistance R,
An equivalent inductance L,
Grounding resistor r on side u of power supply1、
Grounding resistor r on C side of load capacitor2、
The values of arc resistance r (t) between ports in the opening and closing process of the isolating switch DS and port capacitance c (t) in the opening and closing process of the isolating switch DS change along with time.
One end of the power supply u is connected with the internal resistance R of the power supply side lineuOne end, power supply side line internal resistance RuThe other end is connected with a power supply side line inductor LuOne end, power supply side line inductance LuThe other end of the isolating switch DS is connected with one end of an isolating switch DS, the other end of the isolating switch DS is connected with one end of an arc resistor R (t), and the other end of the arc resistor R (t) is connected with the equivalent resistor RLOne end, the equivalent resistance RLThe other end is connected with an equivalent inductor LLEquivalent inductance LLOne end of a load capacitor C is connected, and the other end of the load capacitor C is connected with the grounding resistor r2One end of the ground resistor r2The other end is grounded;
the other end of the power supply u is respectively connected with: the grounding resistor r1Stray capacitance C of one end and power supply port to groundu1Stray capacitance C to ground at the other end and power connection lineu2The other end of the capacitor is a stray capacitor C to the ground at the left side of the isolating switch DS1The other end of the capacitor is a stray capacitance C to the ground at the right side of the isolating switch DS2The other end of the load capacitor C;
the power supply port is connected with a stray capacitor C to the groundu1One end is connected with the internal resistance R of the power supply side lineuAt one end of the first and second connecting rods,
stray capacitance C to ground at the power connection lineu2One end is connected with a power supply side line inductor LuThe other end of the first tube is provided with a first end,
the left side of the isolating switch DS is connected with the stray capacitance C to the ground1One end of the switch is connected with one end of the isolating switch DS,
the stray capacitance C to the ground at the right side of the isolating switch DS2One end of the resistor is connected with the equivalent resistor RLAt one end of the first and second connecting rods,
the grounding resistor r1The other end is grounded,
one end of the isolating switch DS is connected with one end of the port capacitor c (t), the other end of the port capacitor c (t) is connected with the other end of the arc resistor r (t),
the equivalent resistor R is connected with a load capacitor C in parallel, and the load capacitor C is connected with the equivalent inductor L in parallel.
The electric arc resistance and the port capacitance between the ports in the opening and closing process of the isolating switch have the value expression as follows:
r(t)＝r0(1+a*e-t/b) (1)
c(t)＝c0*k*t (2)
in the above two formulae, r0The initial resistance is generally less than 1 omega; c. C0The initial capacitance is obtained by taking the value as pF level; a. b and k are corresponding coefficients respectively, wherein the value of a is generally 106Level, b generally takes the value of 10-9The value of the level k can be changed according to the opening and closing speed of the isolating switch, and practically can be 1.
Compared with the existing common simulation model of the disconnecting switch in the opening and closing process shown in fig. 1(a), the model of the VFTO modeling analysis method in the opening and closing process of the disconnecting switch is closer to the actual wiring condition, so that the simulation result is more consistent with the waveform of the test result, and the actual condition is effectively reflected through simulation. Compared with the common simulation model at present, the simulation model has the following different points:
1) the current model usually only considers the stray capacitance to ground C of the outlet end at the power supply sideu2While neglecting the equivalent capacitance C of the power portu1Since the connection line from the power port to the isolating switch has a certain distance, C needs to be consideredu1The influence of (a);
2) the stray capacitance to the ground at the two sides of the isolating switch is taken into consideration, and because the isolating switch generates high-frequency signals in the opening and closing process, the capacitive reactance of the stray capacitance to the ground is very small under the condition that the capacitance of the stray capacitance to the ground is very small, and the stray capacitance to the ground cannot be replaced by an open circuit;
3) the load capacitor takes the equivalent resistance and the equivalent inductance value of the load capacitor into consideration, although the capacitance of the load capacitor is larger, the load capacitor has corresponding equivalent resistance and equivalent inductance due to the limitation of the practical process, and cannot be ignored under high frequency, particularly the influence of the equivalent inductance cannot be ignored;
4) the influence of the ground resistance on the power supply side and the load side is taken into consideration. The low-voltage terminals of related equipment are grounded in the opening and closing processes of the isolating switch, although the low-voltage terminals are connected together through the grounding wire, the grounding wire has a certain resistance value, and if the influence of grounding resistance is considered, the model is more accurate;
5) the arc reignition and extinction in the opening and closing process of the isolating switch are not simply considered as the opening and the disconnection of the switch, but the influence of arc resistance and equivalent capacitance is considered in the process of the arc reignition and extinction. At present, during general modeling, the arc reignition is regarded as the switch is closed, the resistance is generally considered to be 0, and the phenomenon that the arc resistance changes along with time is considered, and the phenomenon that the equivalent capacitance between two ports of the isolating switch changes along with time is also considered, so that a simulation result is closer to the actual situation.
The simulation flow chart of the VFTO modeling analysis method in the opening and closing processes of the isolating switch is shown in FIG. 2. The figure takes the closing situation of the isolating switch as an example, and the opening situation is similar to the closing situation. The key points are as follows:
firstly, setting simulation circuit parameters including voltage, each resistor, each inductor and each capacitance value according to the model and the opening and closing speed of the actual isolating switch. Especially, the factors such as the equivalent capacitance of the power port, the stray capacitance to ground on both sides of the isolating switch, the equivalent resistance and the equivalent inductance of the load capacitance, and the grounding resistance on the power side and the load side are considered. Each parameter can be calculated according to the actually used power supply, the isolating switch, the load capacitor model and the like. The size of the grounding resistance can be obtained by measuring an actual line.
Secondly, setting simulation step length: because the frequency of the high-frequency signal generated in the opening and closing process of the isolating switch can reach dozens of MHz or even higher, the interval time set by the simulation step length is short enough, and the common time is less than
Typically 1ns or less may be desirable in the simulation of the present invention.
And thirdly, in the process of reigniting or extinguishing the electric arc of the isolating switch, the isolating switch is not simply switched on or switched off, but a time-varying model of the electric arc resistance and a time-varying model of equivalent capacitors at two ends of the isolating switch are considered, and the value taking mode is shown in the formulas (1) and (2).
The comparison result of the VFTO modeling analysis method in the opening and closing process of the isolating switch and the current common modeling model is shown in FIG. 3. Wherein, fig. 3(a) is a graph of simulation results of the model of fig. 1(a), fig. 3(b) is simulation results of the model provided by the present invention, and fig. 3(c) is actual test results.
As can be seen from comparison of the three figures, the simulation result of the model provided by the invention is more consistent with the actual test result. The transient processes of the simulated waveforms are further compared, that is, the waveforms in fig. 3(a), 3(b) and 3(c) are enlarged (black circles in the figures), and the corresponding graphs in fig. 3(d), 3(e) and 3(f) are obtained. Comparing fig. 3(d), fig. 3(e) and fig. 3(f), it can be seen that the simulated transient waveform 3(e) of the model provided by the present invention is more consistent with the actually tested transient waveform 3 (f).
According to the VFTO modeling analysis method in the opening and closing process of the isolating switch, due to the fact that the simulation circuit model which is closer to the actual wiring condition is adopted, the influences of factors such as the equivalent capacitance of a power port, stray capacitance to the ground at two sides of the isolating switch, equivalent resistance and equivalent inductance value of load capacitance, grounding resistance at the power side and the load side, arc resistance and equivalent capacitance in the opening and closing process of the isolating switch are comprehensively considered, and therefore the simulation result is closer to the actual test result, and a feasible method is provided for researching the VFTO phenomenon through modeling in the future.
Compared with the common simulation model at present, the simulation model has the following different points:
1): the equivalent capacitance C of the power port is consideredu1The existing model usually only considers the stray capacitance to ground of the outlet end at the power supply side, but neglects the equivalent capacitance of the power supply port, because the connecting line between the power supply port and the isolating switch has a certain distance, the equivalent capacitance of the power supply port is ignoredThis requires consideration of its effects;
2): the stray capacitance to the ground at the two sides of the isolating switch is taken into consideration, and because the isolating switch generates high-frequency signals in the opening and closing process, the capacitive reactance of the stray capacitance to the ground is very small under the condition that the capacitance of the stray capacitance to the ground is very small, and the stray capacitance to the ground cannot be replaced by an open circuit;
3): the load capacitor considers the equivalent resistance and the equivalent inductance value of the load capacitor, although the capacitance of the load capacitor is larger, the load capacitor has corresponding equivalent resistance and equivalent inductance due to the limitation of the practical process, and cannot be ignored under high frequency, particularly the influence of the equivalent inductance cannot be ignored;
4) (ii) a The influence of the ground resistance of the power supply side and the load side is taken into consideration. The low-voltage terminals of related equipment are grounded in the opening and closing processes of the isolating switch, although the low-voltage terminals are connected together through the grounding wire, the grounding wire has a certain resistance value, and if the influence of grounding resistance is considered, the model is more accurate;
5): the arc reignition and extinction in the opening and closing process of the isolating switch are not simply considered as the opening and the disconnection of the switch, but the influence of arc resistance and equivalent capacitance is considered in the process of the arc reignition and extinction. At present, during general modeling, the arc reignition is regarded as the switch is closed, the resistance is generally considered to be 0, and the phenomenon that the arc resistance changes along with time is considered, and the phenomenon that the equivalent capacitance between two ports of the isolating switch changes along with time is also considered, so that a simulation result is closer to the actual situation.
Claims (3)
1. The VFTO modeling analysis method in the opening and closing process of the isolating switch is characterized in that: the simulation circuit model for the switching process of the isolating switch comprises:
a power supply u,
Internal resistance R of power supply side lineu、
Power supply side line inductance Lu、
Stray capacitance C of power port to groundu1、
Stray capacitance to ground C at power connection lineu2、
A disconnecting switch DS,
Stray capacitance C to ground on the left side of the isolating switch DS1、
Stray capacitance C to ground on right side of isolating switch DS2、
Equivalent resistor R of connecting line between isolating switch DS and load capacitor CL、
Equivalent inductance L of connecting line between isolating switch DS and load capacitor CL、
A load capacitance C,
An equivalent resistance R,
An equivalent inductance L,
Grounding resistor r on side u of power supply1、
Grounding resistor r on C side of load capacitor2、
Arc resistance r (t) between ports in the opening and closing process of the disconnecting switch DS,
Port capacitance c (t) in the opening and closing process of the isolating switch DS;
one end of the power supply u is connected with the internal resistance R of the power supply side lineuOne end, power supply side line internal resistance RuThe other end is connected with a power supply side line inductor LuOne end, power supply side line inductance LuThe other end of the isolating switch DS is connected with one end of an isolating switch DS, the other end of the isolating switch DS is connected with one end of an arc resistor R (t), and the other end of the arc resistor R (t) is connected with the equivalent resistor RLOne end, the equivalent resistance RLThe other end is connected with an equivalent inductor LLEquivalent inductance LLOne end of a load capacitor C is connected, and the other end of the load capacitor C is connected with the grounding resistor r2One end of the ground resistor r2The other end is grounded;
the other end of the power supply u is respectively connected with: the grounding resistor r1Stray capacitance C of one end and power supply port to groundu1Stray capacitance C to ground at the other end and power connection lineu2The other end of the capacitor is a stray capacitor C to the ground at the left side of the isolating switch DS1The other end of the capacitor is a stray capacitance C to the ground at the right side of the isolating switch DS2The other end of the load capacitor C;
the power supply port is connected with a stray capacitor C to the groundu1One end is connected with the electricityInternal resistance R of source side lineuAt one end of the first and second connecting rods,
stray capacitance C to ground at the power connection lineu2One end is connected with a power supply side line inductor LuThe other end of the first tube is provided with a first end,
the left side of the isolating switch DS is connected with the stray capacitance C to the ground1One end of the switch is connected with one end of the isolating switch DS,
the stray capacitance C to the ground at the right side of the isolating switch DS2One end of the resistor is connected with the equivalent resistor RLAt one end of the first and second connecting rods,
the grounding resistor r1The other end is grounded,
one end of the isolating switch DS is connected with one end of the port capacitor c (t), the other end of the port capacitor c (t) is connected with the other end of the arc resistor r (t),
the equivalent resistor R is connected with a load capacitor C in parallel, and the load capacitor C is connected with the equivalent inductor L in parallel;
the VFTO modeling analysis method comprises the following steps:
step 1: setting simulation circuit model parameters according to the model number and the opening and closing speed of the actual isolating switch, wherein the simulation circuit model parameters comprise voltage, resistors, inductors and capacitance values; considering the equivalent capacitance of the power port and the stray capacitance C to the ground at the left side of the isolating switch DS1And stray capacitance C to ground at right side of isolating switch DS2Equivalent resistance R, equivalent inductance L, grounding resistance R at power supply u side1And the grounding resistor r on the C side of the load capacitor2Calculating each parameter according to the model of a power supply u, an isolating switch DS and a load capacitor C which are actually used, and measuring the size of the grounding resistance of an actual circuit to obtain the grounding resistance;
step 2: setting simulation step length:
here, 1ns or less is taken;
and step 3: the reignition or extinction process of the arc of the disconnecting switch DS takes into account a time-varying model of the arc resistance r (t) and a time-varying model of the port capacitance c (t) of the disconnecting switch DS.
2. A VFTO modeling and analyzing method in the opening and closing process of the isolating switch according to claim 1, characterized in that:
the arc resistance r (t) and the port capacitance c (t) between the ports in the opening and closing process of the isolating switch DS have the values expressed as:
r(t)＝r0(1+a*e-t/b) (1)
c(t)＝c0*k*t (2)
in the above formulas (1) and (2), r0The initial resistance is less than 1 omega; c. C0The initial capacitance is obtained by taking the value as pF level; a. b and k are corresponding coefficients respectively, wherein the value of a is 106Level, b has a value of 10-9The stage k varies according to the switching speed of the isolating switch, and actually takes 1.
3. A VFTO modeling analysis method in an opening and closing process of a disconnecting switch according to claim 1 or 2, characterized in that: the method is used for modeling and analyzing the VFTO amplitude, phase and frequency parameters in the opening and closing process of the isolating switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810069451.9A CN108334684B (en) | 2018-01-24 | 2018-01-24 | VFTO modeling analysis method in opening and closing process of isolating switch |
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| CN108988330B (en) * | 2018-08-01 | 2021-09-03 | 广东电网有限责任公司 | Power system simulation method considering electric arc of isolating switch fracture |
| CN111273166A (en) * | 2018-12-05 | 2020-06-12 | 西安高压电器研究院有限责任公司 | Little inductive current of isolator test circuit that opens and shuts |
| CN110233481B (en) * | 2019-06-28 | 2020-10-27 | 国家电网有限公司 | Simulation method of isolation switch in power grid topology |
| CN117406022A (en) * | 2023-10-19 | 2024-01-16 | 国网湖北省电力有限公司荆门供电公司 | Travelling wave speed dynamic correction method suitable for high-voltage line length change |
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