CN108988330B - Power system simulation method considering electric arc of isolating switch fracture - Google Patents
Power system simulation method considering electric arc of isolating switch fracture Download PDFInfo
- Publication number
- CN108988330B CN108988330B CN201810864656.6A CN201810864656A CN108988330B CN 108988330 B CN108988330 B CN 108988330B CN 201810864656 A CN201810864656 A CN 201810864656A CN 108988330 B CN108988330 B CN 108988330B
- Authority
- CN
- China
- Prior art keywords
- arc
- fracture
- simulation
- corresponding relation
- disconnecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The embodiment of the application discloses a power system simulation method considering an isolating switch fracture arc, which comprises the following steps: s1, establishing a third corresponding relation between the breakdown voltage and the time in the disconnecting/connecting process of the disconnecting switch according to the first corresponding relation between the fracture distance and the time in the disconnecting/connecting process of the disconnecting switch and the second corresponding relation between the fracture distance and the breakdown voltage; s2, setting an arc state judgment basis of the arc simulation module according to the third corresponding relation; and S3, calling the arc simulation module in the power system simulation model for simulation. The method solves the technical problems that most of the existing simulation analysis considering the electric arc aims at the electric transmission line discharge, a simulation method considering the electric arc caused by the on/off disconnecting switch is lacked, and the influence of the electric arc caused by the on/off disconnecting switch on the electric power equipment is difficult to evaluate.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a power system simulation method considering an arc of a break of an isolating switch.
Background
When a power device fails, transient change of a power system is often caused, wherein a transient change process caused by an arc is the most complicated and has a large influence on the device, so that it is necessary to analyze a power grid transient process caused by the arc, evaluate the influence of the arc on the power device, and usually analyze the arc process by adopting a simulation means.
In an electric power enterprise, an on/off disconnecting switch is the most common operation, and when the on/off disconnecting switch is operated, an arc is often generated, but most of current simulation analysis considering the arc aims at power transmission line discharge, a simulation method considering the arc caused by the on/off disconnecting switch is lacked, and the influence of the arc caused by the on/off disconnecting switch on electric power equipment is difficult to evaluate.
Disclosure of Invention
The embodiment of the application provides a power system simulation method considering an arc at a break of an isolating switch, and solves the technical problems that most of simulation analysis considering the arc aims at the discharge of a power transmission line, a simulation method considering the arc caused by an on/off isolating switch is lacked, and the influence of the arc caused by the on/off isolating switch on power equipment is difficult to evaluate.
In view of the above, the present application provides a power system simulation method considering a break arc of an isolator switch, the method comprising the steps of:
s1, establishing a third corresponding relation between the breakdown voltage and the time in the disconnecting/connecting process of the disconnecting switch according to the first corresponding relation between the fracture distance and the time in the disconnecting/connecting process of the disconnecting switch and the second corresponding relation between the fracture distance and the breakdown voltage;
s2, setting an arc state judgment basis of the arc simulation module according to the third corresponding relation;
and S3, calling the arc simulation module in the power system simulation model for simulation.
Preferably, the arc state judgment criterion specifically includes the steps of:
a1, judging whether the monitored current amplitude of the fracture arc is smaller than a preset current amplitude, if so, entering the step A2, otherwise, determining that the fracture arc is in an arcing state and entering the step A1 again;
a2, judging whether the voltage at two ends of the isolating switch fracture monitored in real time is larger than the breakdown voltage corresponding to the same moment, if so, entering the step A1, and if not, determining that the fracture electric arc is in an arc extinction state.
Preferably, the step a1 specifically includes:
and B, judging whether the monitored current amplitude of the fracture arc is smaller than a preset current amplitude and whether the voltage change rate of the fracture arc is smaller than a preset voltage change rate, if so, entering the step A2, otherwise, determining that the fracture arc is in an arcing state and entering the step A1 again.
Preferably, the step S1 specifically includes:
according to a first corresponding relation between fracture distance and time in the disconnecting switch on/off process and a second corresponding relation between the fracture distance and breakdown voltage, a relation curve between the breakdown voltage and the time in the disconnecting switch on/off process is constructed, the relation curve is subjected to piecewise fitting to obtain a mathematical expression of the breakdown voltage of the disconnecting switch on/off process changing along with the time, and the mathematical expression is used as a third corresponding relation.
Preferably, the power system simulation model includes: the system comprises an electric power equipment equivalent model, a power transmission line equivalent model and a power grid parameter equivalent model.
Preferably, the step S3 is followed by:
s4, calculating the heat accumulated by the equivalent model of the power equipment according to the current and the voltage monitored in the simulation process;
and S5, comparing the heat with the rated current capacity of the equivalent model of the power equipment to obtain an equipment state evaluation result.
Preferably, the power system simulation model further comprises:
a fault/operation module to adjust power system parameters to simulate power operation or power faults.
Preferably, the power equipment equivalent model specifically includes: the system comprises an isolating switch equivalent model, a lightning arrester equivalent model, a circuit breaker equivalent model, a current transformer equivalent model and a voltage transformer equivalent model.
Preferably, the first corresponding relationship between the fracture distance and the time in the disconnecting switch on/off process is a relationship curve of the fracture distance of the disconnecting switch on/off process changing with the time, which is obtained according to the physical structure of the disconnecting switch and the characteristics of the transmission device.
Preferably, the second corresponding relationship between the fracture distance and the breakdown voltage is a second corresponding relationship between the fracture distance and the breakdown voltage in the disconnecting/connecting process of the disconnecting switch, which is obtained according to field test data.
According to the technical scheme, the embodiment of the application has the following advantages:
according to a first corresponding relation between the fracture distance and time in the disconnecting/closing process of the disconnecting switch and a second corresponding relation between the fracture distance and breakdown voltage, a third corresponding relation between the breakdown voltage and time in the disconnecting/closing process of the disconnecting switch is established, then according to the third corresponding relation, an arc state judgment basis of an arc simulation module is set, and the arc simulation module is called in a power system simulation model to carry out simulation. Because the relation between the breakdown voltage and the time of the isolating switch in the on/off process is considered when the arc state judgment basis of the arc simulation module is set, and the relation between the breakdown voltage and the time of the isolating switch in the on/off process can reflect the nonlinear change of the fracture distance in the on/off process of the isolating switch, the simulation method can accurately simulate the process of the transient change of the power system caused by the arc generated by the on/off isolating switch, and therefore the influence of the arc generated by the on/off isolating switch on the power equipment can be evaluated according to the data obtained by simulation.
Drawings
FIG. 1 is a schematic diagram of a typical isolator switch;
FIG. 2 is a schematic flow diagram illustrating a first embodiment of a power system simulation method for considering an arc at a break of an isolating switch provided by the present application;
FIG. 3 is a schematic flow chart diagram illustrating a second embodiment of a power system simulation method for considering an arc at an opening of an isolating switch provided by the present application;
FIG. 4 is a graph showing a relationship between a fracture distance and time in a switching-off process of a certain isolating switch;
FIG. 5 is a schematic diagram of a program programmed using EMTP for a breakdown voltage criterion
FIG. 6 is a schematic wiring diagram of a power system simulation model under a transmission jam fault of an isolator;
FIG. 7 is a graph of voltage waveforms for a power device from a simulation process;
FIG. 8 is a schematic diagram of the energy accumulation of the capacitor during hot standby and multiple arcing;
FIG. 9 is a schematic diagram of the estimation of line-to-ground capacitance using the varify function in EMTP;
fig. 10 is a schematic view of a typical current-voltage characteristic curve of a lightning arrester resistor disc;
fig. 11 is a wiring diagram of an equivalent system corresponding to the switching short bus.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The main purpose of the isolating switch is to ensure the isolation between the maintenance part and the charged body in the circuit, and the action modes of the isolating switch can be classified into a knife switch type, a rotary type, an insertion type and the like, and refer to fig. 1, wherein fig. 1 is a schematic structural diagram of a typical isolating switch. The distance between the isolating switch and the break is usually more than one meter, and when the isolating switch is operated, the knife switch rotates in a plane to drive the moving contacts to separate under the drive of a manual or electric operating mechanism. In the process, an arc discharge phenomenon often exists. Due to the transmission characteristics, the running time and the fracture distance change are always in a nonlinear relation.
Referring to fig. 2, fig. 2 is a schematic flowchart of a first embodiment of a power system simulation method for considering an arc of a break of an isolating switch, the method including:
step 201: and establishing a third corresponding relation between the breakdown voltage and the time of the disconnecting switch in the opening/closing process according to the first corresponding relation between the fracture distance and the time of the disconnecting switch in the opening/closing process and the second corresponding relation between the fracture distance and the breakdown voltage.
The first corresponding relation is the corresponding relation between the fracture distance and the time, and the second corresponding relation is the corresponding relation between the fracture distance and the breakdown voltage, so that a third corresponding relation between the breakdown voltage and the time can be established by combining the first corresponding relation and the second corresponding relation, and obviously, the third corresponding relation already contains information of the change of the fracture distance along with the time.
Step 202: and setting an arc state judgment basis of the arc simulation module according to the third corresponding relation.
After the third corresponding relationship is obtained, the arc state judgment basis of the arc simulation module can be set by using the data and the relationship information of the breakdown voltage and the time contained in the third corresponding relationship.
Step 203: and calling an arc simulation module in the power system simulation model for simulation.
It should be understood that the power system simulation model is a system that simulates the whole power system, and the arc simulation module may be called on the basis of the simulation model, and since the arc state determination basis of the arc simulation module is set by using the corresponding relationship between the breakdown voltage of the disconnector and the time, the simulation process may also reflect the influence caused by the arc generated by the on/off disconnector.
In the first embodiment provided by the application, a third corresponding relation between breakdown voltage and time of the disconnecting switch on/off process is established according to a first corresponding relation between the fracture distance and the time of the disconnecting switch on/off process and a second corresponding relation between the fracture distance and the breakdown voltage, then an arc state judgment basis of an arc simulation module is set according to the third corresponding relation, and the arc simulation module is called in a power system simulation model for simulation. Because the relation between the breakdown voltage and the time of the isolating switch in the on/off process is considered when the arc state judgment basis of the arc simulation module is set, and the relation between the breakdown voltage and the time of the isolating switch in the on/off process can reflect the nonlinear change of the fracture distance in the on/off process of the isolating switch, the simulation method can accurately simulate the process of the transient change of the power system caused by the arc generated by the on/off isolating switch, and therefore the influence of the arc generated by the on/off isolating switch on the power equipment can be evaluated according to the data obtained by simulation.
Referring to fig. 3, fig. 3 is a schematic flow chart of a second embodiment of the power system simulation method considering the arc at the break of the disconnector provided in the present application, where the method includes:
step 301: according to a first corresponding relation between the fracture distance and time in the disconnecting switch opening/closing process and a second corresponding relation between the fracture distance and breakdown voltage, a relation curve between the breakdown voltage and the time in the disconnecting switch opening/closing process is constructed, the relation curve is subjected to piecewise fitting to obtain a mathematical expression of the breakdown voltage of the disconnecting switch opening/closing process changing along with the time, and the mathematical expression is used as a third corresponding relation.
It should be noted that the first corresponding relationship between the fracture distance and the time in the opening/closing process of the disconnecting switch can be obtained according to the physical structure of the disconnecting switch and the characteristics of the transmission device, specifically, the first corresponding relationship can be a relationship curve reflecting the change of the fracture distance along with the time, as shown in fig. 4, fig. 4 is a relationship curve graph of the fracture distance and the time in the opening process of a certain disconnecting switch; the second corresponding relation between the fracture distance and the breakdown voltage in the disconnecting/connecting process of the isolating switch can be obtained by carrying out a test on site and processing the tested data.
After a relation curve of breakdown voltage and time in the on/off process of the isolating switch is constructed, the relation curve can be subjected to piecewise fitting to obtain a mathematical expression of the relation curve, so that a computer can calculate and process data conveniently.
Step 302: according to the third corresponding relation, setting the arc state judgment basis of the arc simulation module as follows:
step 3021: judging whether the monitored current amplitude of the fracture arc is smaller than a preset current amplitude, if so, entering a step 3022, otherwise, determining that the fracture arc is in an arcing state and re-performing the step 3021; step 3022: and judging whether the voltage at two ends of the fracture of the isolating switch monitored in real time is greater than the corresponding breakdown voltage at the same moment, if so, entering a step 3021, and if not, determining that the arc of the fracture is in an arc extinction state.
It should be noted that, specifically, when a simulation model is constructed, a voltage and current real-time monitoring module may be disposed on two sides of a fracture of the isolating switch, the voltage and the arc current at two ends of the fracture are monitored, the absolute value of the voltage at two ends of the fracture is obtained through monitoring, and the absolute value of the voltage and the measured current value of the arc are provided to the arc simulation module.
The arc simulation module can simulate the arc blowout process according to the arc theory, namely the behavior characteristic of the next time period can be estimated under the condition that the arc state and the system state are known. The specific description is as follows: if the electric arc is known to be in an arc burning state, the electric arc is extinguished at a zero crossing point according to an electric arc theory, and the arc current is difficult to maintain when the arc current is smaller than a certain value when the arc path is long, so a preset current amplitude value can be set, and if the current amplitude value of the monitored fracture electric arc is smaller than the preset current amplitude value, the electric arc cannot be maintained and is about to be extinguished; and if the monitored current amplitude of the fracture arc is still larger than or equal to the preset current amplitude, which indicates that the arc is to be maintained continuously, restarting step 3021, and continuing to judge the current amplitude of the fracture arc at the next moment.
It should be noted that, when determining whether the arc can be maintained, in order to obtain a more accurate simulation result, it may also be determined whether the voltage change rate of the fracture arc is smaller than the preset voltage change rate while determining whether the current amplitude of the fracture arc is smaller than the preset current amplitude, and when the two conditions are satisfied simultaneously, it is determined that the arc is in an extinguished state, otherwise, the arc is in an arcing state.
If the arc cannot be maintained, whether the arc can be reignited or not needs to be judged, in step 3022, a monitored voltage characteristic can be an absolute value of a voltage at the fracture, or a transient recovery voltage gradient, and the like, and a breakdown voltage at the moment can be calculated by using a third correspondence relationship, and whether the voltage at two ends of the fracture of the isolator monitored in real time is greater than the calculated breakdown voltage corresponding to the same moment or not is judged, if so, the fracture is re-broken, and at the moment, the arc reignites, so that when the step 3021 is performed again, a current amplitude of the fracture arc is also greater than a preset current amplitude, and it can be determined that the fracture arc is in an arcing state; of course, if the voltage at two ends of the fracture of the isolating switch monitored in real time is not greater than the corresponding breakdown voltage at the same moment, the arc cannot be reignited, and the arc can be directly determined to be in an arc quenching state. In a specific implementation, the EMTP software can be used for programming, as shown in fig. 5, and fig. 5 is a schematic diagram of a program written by EMTP and related to the breakdown voltage criterion.
The arc state judgment basis is recycled, the arc simulation module can judge the arc state at each moment in the simulation time period in real time, and when the arc state is clear, the arc simulation module can play a role in simulating the generation of the arc in the simulation, so that the power system simulation model generates a corresponding transient change process.
Step 303: and calling an arc simulation module in the power system simulation model for simulation.
The power system simulation model is a complete power system model and can include a power equipment equivalent model, a transmission line equivalent model and a power grid parameter equivalent model.
The power equipment equivalent model may include various power equipment, such as an isolating switch equivalent model, a lightning arrester equivalent model, a circuit breaker equivalent model, a current transformer equivalent model and a voltage transformer equivalent model; of course, according to actual requirements, models of other power devices, such as a capacitor equivalent model, a reactor equivalent model, and the like, may be added, and various power devices may be applied to the technical solution provided in the present application, which is not limited herein.
The power system simulation model may also include a fault/operation module for adjusting power system parameters to simulate power operation or power faults. Specifically, the simulated power operation can be a system switching operation, and the system switching process can be understood as a process of operating a short bus by an isolating switch and a process of switching a bus or a line by a circuit breaker, and the switching bus has an arcing phenomenon in actual operation; and the simulated power failure may be a sudden failure, such as a stuck transmission of the disconnector, a uniform capacitance failure of the circuit breaker, etc., which may cause the arcing hazard to be further extended. The fault/operation module can be a time-controlled switch, an earthing switch, etc. according to actual requirements. Referring to fig. 6, fig. 6 is a schematic wiring diagram of a power system simulation model under a transmission jam fault of an isolating switch.
Step 304: and calculating the heat accumulated by the equivalent model of the power equipment according to the current and the voltage monitored in the simulation process.
During specific simulation, voltage and current probes can be arranged on two sides of each power equipment equivalent model, waveform data of transient voltage and transient current of a power system in the simulation process are collected, as shown in fig. 7, fig. 7 is a voltage waveform diagram of certain power equipment obtained in the simulation process, and heat accumulated by each power equipment can be calculated by utilizing collected voltage and current data through integral operation.
For example, voltage and current probes are arranged on two sides of an equivalent model of the lightning arrester, and the waveform of energy accumulation of a resistance card of the lightning arrester, which rises along with time, can be obtained through integration; the accumulated heat can be calculated according to the output voltage waveform and the current waveform and the combination of the duration, as shown in fig. 8, and fig. 8 is a schematic diagram of the energy accumulation condition of the capacitor under the conditions of hot standby and multiple arcing.
Step 305: and comparing the heat with the rated through-current capacity of the equivalent model of the power equipment to obtain an equipment state evaluation result.
After the heat accumulated by each power device is calculated, the heat accumulated by each power device is compared with the rated current capacity of the power device, so that the condition of the power device under the influence of an electric arc generated by an on/off isolating switch can be judged, if the calculated heat is far larger than the rated current capacity of the power device, the power device is in a serious overheating condition, and the temperature rise of the power device can also be calculated through the heat, so that whether the heat generation of the power device is in a reasonable range or not is judged, and the condition of each power device can be evaluated.
Without considering the transient heat dissipation situation, it can be considered that the energy absorbed by each device in the system during the arcing period is completely converted into heat. Under the condition that system parameters are different, such as a power transmission line is long, a cable is adopted for outgoing, and the like, the operation sequence when the disconnecting switch is switched is different, and the influence on the arc-drawing process is different, namely, the proper operation sequence is adopted, so that certain serious arc-drawing phenomena can be avoided, and the arc-drawing time can be reduced. Therefore, the evaluation result can play a good guiding role in fault finding and risk evaluation, can play a guiding role in optimizing the operation sequence of the power grid, equipment type selection and the like, and further can reduce the operation risk and detection cost of the power grid.
The following is an example of a specific implementation of establishing an equivalent model of the power equipment in the simulation process:
for the power grid parameter equivalent model, the system can be simulated through the given system short-circuit capacity and the system zero-sequence impedance. The positive sequence impedance of the equivalent power source is calculated according to a formula 4-20 of a first part of an electrical design manual of electric power engineering, and is expressed by pure inductance, and the zero sequence impedance of the system can be given by a system calculation department of the position of the circuit according to the formula.
In the formula
L-system equivalent positive sequence inductance (mH)
S' -short circuit capacity (MVA)
UeLine voltage rating (kV) of the network or generator circuit
The transient wave process and the equivalent capacitance of the power transmission line module have great influence on the simulation system. The transmission line module must take into account its distributed parameter characteristics, with the main parameters being inductance value and capacitance to ground. Therefore, different line models can be selected according to the equivalent requirement of the transient process, an LCC-Jmarti model in ATP/EMTP can be generally adopted, and if the centralized parameter characteristic of the line models needs to be evaluated, the line models can be equivalent to a centralized ground capacitor under some conditions. For the overhead transmission line, the capacitance value is calculated through the verify function of the Jmarti model of the LCC module to calculate the charging power, and then the equivalent capacitance is converted, the calculation process is as shown in fig. 9, and fig. 9 is a schematic diagram of estimating the capacitance of the line to the ground by adopting the varify function in the EMTP.
The simple calculation can be carried out on the capacitance current according to a formula (6-33) of 'Primary part of Electrical design Manual of Electrical engineering', so as to further calculate the equivalent concentrated capacitance:
Ic＝(2.7～3.3)UeL×10-3 (2)
in the formula
L-line length (km);
Ic-overhead line capacitive current (a);
2.7-coefficient, applicable to lines without overhead ground wires;
3.3-factor, applicable to lines with overhead ground wires;
for cables, this value can be calculated according to the formula provided in the Electrical engineering Manual parts of the designs section (6-34), as follows:
Ic＝0.1UeL (3)
and (3) calculating the equivalent ground concentrated capacitance of the circuit by adopting a formula of 'a first part of an electrical engineering design manual' (3-1) according to the capacitance current obtained by the formulas (1) and (2):
in the formula
Omega-angular frequency;
c-each item of the system is capacitive to ground;
obtaining by solution:
the lightning arrester as a voltage protection device has a large influence on arc simulation, and the simulation of characteristics of the lightning arrester by U (I) must be considered, and main parameters of the lightning arrester are represented by rated voltage Ur and continuous operation voltage Uc on a name plate of actual equipment, as shown in fig. 10, and fig. 10 is a typical voltage-current characteristic curve diagram of a lightning arrester resistance card.
By accurately considering the nonlinear characteristic of the lightning arrester, the practical operation safety of related equipment under the lightning arrester protection condition can be analyzed. Meanwhile, the degree of testing the current capacity of the arrester in the arcing process can be obtained by analyzing the energy consumed by the arrester. The energy allowed to be consumed by the lightning arrester can refer to the requirement of a resistor disc type test in GB 11032.
The circuit breaker adopts the earth capacitance to characterize according to the field measured data and typical parameters, the fracture voltage-sharing capacitor adopts the equivalent parallel connection of the capacitance and the leakage current resistance thereof to carry out equivalence, the value is calculated according to two measured data of dielectric loss and capacitance in the capacitor equipment handover test, and the measured value of the capacitance is shown in table 1.
TABLE 1 Circuit breaker equalizing capacitance value
The equivalent resistance of the fracture voltage-sharing capacitor is used for representing the leakage current and the heating characteristic of the capacitor. Dielectric loss values can be measured through a capacitor handover test, the resistance is calculated by combining capacitance, and energy accumulation in the capacitor transient process can be obtained by integrating transient currents at two ends of the resistance. Because the transient process is short in duration, the energy is considered to be completely converted into heat without radiating heat to the surroundings, and it is seen that as the arcing time continues, the energy must gradually rise until the equipment is damaged. As shown in fig. 11, fig. 11 is a wiring diagram of an equivalent system corresponding to the switching short bus.
The partial pressure capacitance of a Capacitance Voltage Transformer (CVT) has a large influence on the arc burning process, and the equipment mainly comprises a capacitance voltage divider unit and an electromagnetic unit. If the influence of the arc process on the CVT is not considered, the device can be equivalent to two capacitor units which are connected in series, and the parameters of the capacitor units are equal to the measured values of the voltage-dividing capacitor devices respectively; if the device needs to be simulated, the electromagnetic unit needs to be equivalent by using a single-phase transformer model provided in the ATP.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (8)
1. A power system simulation method considering an arc of a break of an isolating switch is characterized by comprising the following steps:
s1, establishing a third corresponding relation between the breakdown voltage and the time in the disconnecting/connecting process of the disconnecting switch according to the first corresponding relation between the fracture distance and the time in the disconnecting/connecting process of the disconnecting switch and the second corresponding relation between the fracture distance and the breakdown voltage;
s2, setting an arc state judgment basis of the arc simulation module according to the third corresponding relation;
s3, calling the arc simulation module in the power system simulation model for simulation;
the arc state judgment basis specifically comprises the following steps:
a1, judging whether the monitored current amplitude of the fracture arc is smaller than a preset current amplitude, if so, entering the step A2, otherwise, determining that the fracture arc is in an arcing state and entering the step A1 again;
a2, judging whether the voltage at two ends of the break of the isolating switch monitored in real time is larger than the breakdown voltage corresponding to the same moment, if so, entering the step A1, and if not, determining that the electric arc of the break is in an arc extinguishing state;
the step a1 specifically includes:
and B, judging whether the monitored current amplitude of the fracture arc is smaller than a preset current amplitude and whether the voltage change rate of the fracture arc is smaller than a preset voltage change rate, if so, entering the step A2, otherwise, determining that the fracture arc is in an arcing state and entering the step A1 again.
2. The method according to claim 1, wherein the step S1 specifically includes:
according to a first corresponding relation between fracture distance and time in the disconnecting switch on/off process and a second corresponding relation between the fracture distance and breakdown voltage, a relation curve between the breakdown voltage and the time in the disconnecting switch on/off process is constructed, the relation curve is subjected to piecewise fitting to obtain a mathematical expression of the breakdown voltage of the disconnecting switch on/off process changing along with the time, and the mathematical expression is used as a third corresponding relation.
3. The method of claim 1, wherein the power system simulation model comprises: the system comprises an electric power equipment equivalent model, a power transmission line equivalent model and a power grid parameter equivalent model.
4. The method according to claim 3, wherein the step S3 is further followed by:
s4, calculating the heat accumulated by the equivalent model of the power equipment according to the current and the voltage monitored in the simulation process;
and S5, comparing the heat with the rated current capacity of the equivalent model of the power equipment to obtain an equipment state evaluation result.
5. The method of claim 3, wherein the power system simulation model further comprises:
a fault/operation module to adjust power system parameters to simulate power operation or power faults.
6. The method according to claim 3, wherein the power equipment equivalent model specifically comprises: the system comprises an isolating switch equivalent model, a lightning arrester equivalent model, a circuit breaker equivalent model, a current transformer equivalent model and a voltage transformer equivalent model.
7. The method according to claim 1, wherein the first corresponding relationship between the fracture distance and the time in the disconnecting/connecting process of the disconnecting switch is a curve of the change of the fracture distance in the disconnecting/connecting process of the disconnecting switch with the time, which is obtained according to the physical structure and the transmission characteristics of the disconnecting switch.
8. The method according to claim 1, wherein the second correspondence between the fracture distance and the breakdown voltage is specifically a second correspondence between the fracture distance and the breakdown voltage of the disconnecting switch on/off process obtained according to field test data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810864656.6A CN108988330B (en) | 2018-08-01 | 2018-08-01 | Power system simulation method considering electric arc of isolating switch fracture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810864656.6A CN108988330B (en) | 2018-08-01 | 2018-08-01 | Power system simulation method considering electric arc of isolating switch fracture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108988330A CN108988330A (en) | 2018-12-11 |
| CN108988330B true CN108988330B (en) | 2021-09-03 |
Family
ID=64551232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810864656.6A Active CN108988330B (en) | 2018-08-01 | 2018-08-01 | Power system simulation method considering electric arc of isolating switch fracture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108988330B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110941935B (en) * | 2019-11-01 | 2023-06-23 | 国网宁夏电力有限公司电力科学研究院 | Simulation method and system for arc of double-break circuit breaker |
| CN111274711A (en) * | 2020-02-18 | 2020-06-12 | 云南电网有限责任公司曲靖麒麟供电局 | Simulation method of 220V on-load disconnection cable |
| CN112528586B (en) * | 2020-10-28 | 2022-10-18 | 国网宁夏电力有限公司电力科学研究院 | Method, medium and system for evaluating breaking performance of high-voltage circuit breaker |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102024364A (en) * | 2010-12-31 | 2011-04-20 | 郑州万特电气有限公司 | Simulated training system |
| CN102435941A (en) * | 2011-09-07 | 2012-05-02 | 中国电力科学研究院 | Method for simulating very fast transient over-voltage during opening/closing process of isolating switch |
| CN103592033A (en) * | 2013-11-25 | 2014-02-19 | 国家电网公司 | Method for online monitoring temperature rising of contact of disconnecting switch in GIS tank |
| CN104392049A (en) * | 2014-11-26 | 2015-03-04 | 国家电网公司 | Modeling method for GIS disconnecting switch high frequency voltaic arc resistance model |
| CN105186491A (en) * | 2015-08-27 | 2015-12-23 | 国家电网公司 | Assessment method for overvoltage on primary side of electric power system caused by switching operation |
| CN105990049A (en) * | 2015-02-15 | 2016-10-05 | 西门子公司 | Disconnecting switch and switching device |
| CN106845030A (en) * | 2017-03-10 | 2017-06-13 | 国网江苏省电力公司电力科学研究院 | The modeling method that VFTO influences on air core coil electronic mutual inductor |
| CN107818202A (en) * | 2017-10-19 | 2018-03-20 | 云南电网有限责任公司 | A kind of intelligent substation isolator operation electromagnetic disturbance characteristic analysis method |
| CN108334684A (en) * | 2018-01-24 | 2018-07-27 | 三峡大学 | VFTO modeling and analysis methods in disconnecting switch moving process |
-
2018
- 2018-08-01 CN CN201810864656.6A patent/CN108988330B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102024364A (en) * | 2010-12-31 | 2011-04-20 | 郑州万特电气有限公司 | Simulated training system |
| CN102435941A (en) * | 2011-09-07 | 2012-05-02 | 中国电力科学研究院 | Method for simulating very fast transient over-voltage during opening/closing process of isolating switch |
| CN103592033A (en) * | 2013-11-25 | 2014-02-19 | 国家电网公司 | Method for online monitoring temperature rising of contact of disconnecting switch in GIS tank |
| CN104392049A (en) * | 2014-11-26 | 2015-03-04 | 国家电网公司 | Modeling method for GIS disconnecting switch high frequency voltaic arc resistance model |
| CN105990049A (en) * | 2015-02-15 | 2016-10-05 | 西门子公司 | Disconnecting switch and switching device |
| CN105186491A (en) * | 2015-08-27 | 2015-12-23 | 国家电网公司 | Assessment method for overvoltage on primary side of electric power system caused by switching operation |
| CN106845030A (en) * | 2017-03-10 | 2017-06-13 | 国网江苏省电力公司电力科学研究院 | The modeling method that VFTO influences on air core coil electronic mutual inductor |
| CN107818202A (en) * | 2017-10-19 | 2018-03-20 | 云南电网有限责任公司 | A kind of intelligent substation isolator operation electromagnetic disturbance characteristic analysis method |
| CN108334684A (en) * | 2018-01-24 | 2018-07-27 | 三峡大学 | VFTO modeling and analysis methods in disconnecting switch moving process |
Non-Patent Citations (3)
| Title |
|---|
| Breaking arc characteristics in various power supply frequencies;Nozomi Mikit等;《 Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts》;20070919;全文 * |
| 分段电弧模型下VFTO的计算与分析;孟涛;《电工技术学报》;20100930;第25卷(第9期);全文 * |
| 精确电弧模型下GIS中VFTO的计算与分析;滕辉;《中国优秀硕士学位论文全文数据库》;20140315;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108988330A (en) | 2018-12-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108988330B (en) | Power system simulation method considering electric arc of isolating switch fracture | |
| Martinez et al. | Voltage sag studies in distribution networks-part I: System modeling | |
| CN109633364B (en) | Mutual inductor winding and fuse fault assessment method, device and equipment | |
| dos Santos et al. | High impedance faults: From field tests to modeling | |
| Mendis et al. | Harmonic and transient overvoltage analyses in arc furnace power systems | |
| CN108647479B (en) | Lightning arrester fault transient waveform diagnosis method and device | |
| Kizilcay et al. | Digital simulation of fault arcs in medium-voltage distribution networks | |
| Junior et al. | Fault location in series-compensated transmission lines based on heuristic method | |
| Bak et al. | Vacuum circuit breaker modelling for the assessment of transient recovery voltages: Application to various network configurations | |
| Huang et al. | Relation analysis for ferroresonance of bus potential transformer and circuit breaker grading capacitance | |
| Xin et al. | Sensitivity analysis of reignition overvoltage for vacuum circuit breaker in offshore wind farm using experiment-based modeling | |
| CN112485717A (en) | Power distribution true test load simulation device and method | |
| Hosseini et al. | Impact of surge arrester number and placement on reliability and lightning overvoltage level in high voltage substations | |
| CN113030636B (en) | Active intervention type arc suppression device test system | |
| Ravaglio et al. | Evaluation of lightning-related faults that lead to distribution network outages: An experimental case study | |
| Fakheri et al. | Single phase switching tests on the AEP 765 KV system-extinction time for large secondary arc currents | |
| Almalki et al. | Capacitor bank switching transient analysis using frequency dependent network equivalents | |
| CN106249100B (en) | Ferromagnetic resonance tolerance performance detection system and method for high-voltage fuse | |
| Klucznik et al. | Nonlinear secondary arc model use for evaluation of single pole auto-reclosing effectiveness | |
| Paul et al. | Averting Failure of Pre-Insertion Resistor in Circuit Breaker Through Preventive Maintenance | |
| Kennedy et al. | Protection analysis tool for distribution networks with a high embedded generation penetration | |
| Zhou | Research on neutral voltage offset and its influencing factors of 20kV small resistance grounding system | |
| Wang et al. | Classification of component switching transients in the viewpoint of protective relays | |
| Li et al. | The experimental technique and practical scheme of intelligent switch in power distribution IoT | |
| Mousavi et al. | Transformer internal incipient fault simulations |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |