CN114091246A - Method and system for determining local optimal configuration design of ferrite bead for inhibiting VFTO - Google Patents
Method and system for determining local optimal configuration design of ferrite bead for inhibiting VFTO Download PDFInfo
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Abstract
The invention discloses a method and a system for determining local optimal configuration design of a ferrite bead for inhibiting VFTO (very fast transient overvoltage), wherein an equivalent circuit model of all primary side equipment of a gas insulated substation under VFTO is established, and VFTO waveform representation parameters of key nodes under typical working conditions are calculated; a ferrite magnetic ring is additionally arranged at the position of the power station which suffers from the most severe VFTO; based on the simulation result, sequentially modifying the configuration number, the structure size and the material of the ferrite bead and carrying out simulation calculation; and adjusting the configuration quantity, the structural size and the material of the corresponding ferrite bead according to the simulation calculation result, determining the local optimal value of each corresponding parameter, adjusting the installation position of the ferrite bead, and performing simulation calculation to obtain the local optimal configuration design scheme of the ferrite bead suitable for the power station. The method can effectively and accurately analyze the configuration of the ferrite magnetic ring for inhibiting the VFTO of the given power station, greatly save the protection cost and improve the reliability and effectiveness of the protection.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a method and a system for determining local optimal configuration design of a ferrite magnetic ring for inhibiting VFTO.
Background
The fast transient overvoltage (referred to as VFTO for short) causes serious damage to the insulation tolerance of primary side equipment of a GIS (gas insulated substation) due to the characteristics of short rising edge time of 1-5 ns, highest amplitude of 2.5p.u., high gradient, high main oscillation frequency of 1-10 MHz, many continuous pulse times and the like. Due to the difficulty in the development of the test research of the VFTO, the simulation modeling of the VFTO through electromagnetic transient simulation software becomes the simplest, direct and effective way and means for researching the VFTO. Model construction of GIS equipment under VFTO depends on design structure and electromagnetic characteristics of the equipment, and when VFTO waveform characteristics and insulation matching conditions of GIS primary side equipment are researched, disturbance of the VFTO on a secondary side shielded cable and transient state ground potential lifting are negligible.
The ferrite magnetic ring has nonlinear magnetic characteristics and high-frequency loss characteristics, and can be used for inhibiting VFTO generated by operation of a isolating switch in a pumped storage power station GIS. Due to the fact that the waveform characteristics of the VFTO are different along with the change of GIS equipment parameters, the method for protecting the VFTO by using the ferrite magnetic ring is not universal, the difficulty of the method for protecting the VFTO by using the ferrite magnetic ring is greatly increased, and the method for protecting the VFTO by using the ferrite magnetic ring is high in cost and poor in reliability and effectiveness.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the method and the system for determining the local optimal configuration design of the ferrite bead for inhibiting the VFTO, which can effectively and reliably protect the VFTO, greatly save the protection cost and improve the reliability and effectiveness of the protection.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a method for determining a local optimal configuration design of a ferrite bead for suppressing VFTO comprises the following steps:
and 7, respectively calculating and researching the suppression effect of the ferrite magnetic rings on the VFTO when the ferrite magnetic rings are additionally arranged on the equipment at different positions of the GIS based on the determined optimal configuration number, structural size and materials of the ferrite magnetic rings, and obtaining the local optimal configuration design of the GIS ferrite magnetic rings, thereby realizing the effective suppression of the VFTO.
Further, in the step 1, the equivalent circuit model is established by using an EMTP-RV electromagnetic transient simulation software, and the equivalent circuit model includes a bus, a transformer, a bushing, a high-voltage cable, an isolating switch, a circuit breaker, a voltage transformer, a metal oxide arrester and an arc model.
Further, the bus model adopts a frequency response lossless transmission line model in an FDQ module in the EMTP-RV; the transformer model adopts a model considering the transmission of overvoltage; the sleeve model adopts a lossless transmission line and an overhead end-to-ground capacitance model; the high-voltage CABLE model adopts a CABLE model of frequency response in the FDQ module; when the circuit breaker and the isolating switch model are closed, equivalent simulation is carried out by adopting a lossless transmission line, and when the circuit breaker and the isolating switch model are disconnected, simulation is carried out by adopting a centralized ground capacitor and a fracture capacitor; the voltage transformer model adopts a centralized capacitor model; the metal oxide arrester model adopts a nonlinear resistor/capacitor model considering the response of a steep wave head; the arc model uses a double-exponential arc resistance model.
Further, in step 2, the VFTO waveform characterizing parameters include a maximum voltage amplitude, an overshoot coefficient, a maximum voltage gradient, a maximum gradient time and a main oscillation frequency at each device node under each actual working condition.
Further, in step 3, the method for determining the operating condition of the GIS with the most severe VFTO includes: and determining the working condition with the highest VFTO amplitude as the most serious working condition and the node equipment with the highest VFTO amplitude as the most serious equipment suffering from VFTO according to the VFTO waveform characterization parameters of each equipment node under various actual working conditions.
Further, in step 4, determining the number of ferrite bead configurations with the optimal suppression effect specifically includes:
a trapezoidal network model considering eddy current is used for carrying out equivalence on a single ferrite magnetic ring, and when different numbers of ferrite magnetic rings are additionally arranged at the equipment where the GIS suffers from the most severe VFTO, the suppression effect on the VFTO amplitude and gradient of each node of the equipment is researched by simulation from the number of 1, so that the number of the corresponding ferrite magnetic rings is the optimal configuration number when the suppression effect of the single magnetic ring is not obviously reduced.
Further, in step 5, determining a structural size of the ferrite bead with an optimal suppression effect specifically includes:
installing a ferrite magnetic ring at the position of the GIS equipment suffering from the most severe VFTO, keeping the inner diameter and the outer diameter of the ferrite magnetic ring constant, modifying the axial length of the magnetic ring, correspondingly changing the trapezoidal network model parameters of the ferrite magnetic ring considering the eddy current in EMTP-RV electromagnetic transient simulation software, performing simulation calculation on the ferrite magnetic ring with different axial lengths, and taking the length corresponding to the ferrite magnetic ring with the best suppression effect of the ferrite magnetic ring per unit length as the optimal axial length to suppress the VFTO amplitude and the gradient of each equipment node;
the ferrite magnetic ring is additionally arranged at the position of the GIS equipment suffering from the most serious VFTO, the inner diameter and the axial length of the ferrite magnetic ring are kept constant, the outer diameter of the magnetic ring is changed, the trapezoidal network model parameters of the ferrite magnetic ring in EMTP-RV electromagnetic transient simulation software considering the eddy current are correspondingly modified, the suppression effect of the ferrite magnetic rings with different outer diameters on the VFTO amplitude and gradient of each equipment node is calculated in a simulation mode, and the outer diameter which corresponds to the ferrite magnetic ring with the optimal suppression effect of the ferrite magnetic ring with the inner diameter and the outer diameter of unit length is the optimal outer diameter.
Further, in step 6, determining a ferrite bead material with an optimal suppression effect specifically includes:
when selecting the doping material of the ferrite bead for inhibiting VFTO, selecting the ferrite material doped with elements and oxides for improving the magnetic conductivity of the ferrite bead under high frequency;
installing ferrite beads at the equipment of the GIS suffering from the most severe VFTO, keeping the optimal configuration quantity, size and magnetic conductivity of the ferrite beads, changing the resistivity of the ferrite beads, correspondingly modifying the parameters of a trapezoidal network model of the ferrite beads considering eddy current in EMTP-RV electromagnetic transient simulation software, carrying out simulation calculation on the VFTO gradient of the first section of the corresponding ferrite bead under different resistivity of the ferrite bead, and selecting the resistivity corresponding to the minimum gradient increment as the optimal resistivity of the ferrite bead; and determining the optimal ferrite bead material according to the determined magnetic conductivity and resistivity.
Further, in step 7, based on the determined optimal configuration number, structural size, and material of the ferrite beads, the suppression effect of the ferrite beads on the VFTO when the ferrite beads are installed on the devices at different positions of the GIS is calculated and researched, specifically as follows:
the method comprises the steps of additionally installing the determined optimal configuration number, structure size and material of ferrite magnetic rings at different key equipment of the GIS, modifying corresponding parameters of the ferrite magnetic rings in an EMTP-RV electromagnetic transient simulation software in a trapezoidal network model considering eddy current, carrying out simulation calculation on the amplitude and gradient of VFTO at each equipment node, selecting the position with the optimal VFTO inhibition effect, and obtaining the local optimal configuration design of the ferrite magnetic rings of the GIS station.
A system for determining a localized optimal configuration design for a ferrite bead to reject VFTO, comprising:
the GIS equivalent circuit model establishing module is used for establishing a GIS equivalent circuit model of all primary side equipment and networks outside the ferrite magnetic ring under VFTO;
the calculation module is used for carrying out simulation calculation on the GIS actual operation working condition in the GIS equivalent circuit model, extracting VFTO waveform characterization parameters of each equipment node from the calculation result, and the VFTO waveform characterization parameters are used for judging the suppression effect of VFTO;
the working condition determining module is used for determining the working condition of the GIS with the most serious VFTO according to the simulation calculation result of the GIS actual operation working condition;
the ferrite bead configuration number determining module is used for carrying out simulation calculation on different numbers of ferrite beads configured on the GIS equipment suffering from the most severe VFTO based on a simulation calculation result corresponding to the GIS working condition with the most severe VFTO, and determining the ferrite bead configuration number with the optimal suppression effect;
the ferrite bead structure size determining module is used for carrying out simulation calculation on the same number of ferrite beads with different structure sizes additionally arranged on the GIS equipment suffering from the most severe VFTO based on the determined optimal ferrite bead configuration number, and determining the ferrite bead structure size with the optimal inhibition effect;
the ferrite bead material determining module is used for carrying out simulation calculation on the equipment of the GIS suffering from the most severe VFTO by additionally arranging ferrite beads with the same quantity and the same structure size but different materials based on the determined optimal configuration quantity and structure size of the ferrite beads so as to determine the ferrite bead material with the optimal suppression effect;
and the local optimal configuration determining module is used for respectively calculating and researching the suppression effect of the ferrite magnetic rings on the VFTO when the ferrite magnetic rings are additionally arranged on the equipment at different positions of the GIS based on the determined optimal configuration number, structure size and material of the ferrite magnetic rings, so as to obtain the local optimal configuration design of the GIS ferrite magnetic rings.
Compared with the prior art, the invention has at least the following beneficial effects: before the ferrite magnetic ring is additionally arranged on the GIS, simulation calculation is carried out on various working conditions of the GIS through electromagnetic transient software according to the actual engineering condition of the GIS, and the configuration number, the structure size and the material of the ferrite magnetic ring are sequentially modified and subjected to simulation calculation based on the simulation result; and adjusting the configuration quantity, the structural size and the material of the corresponding ferrite bead according to the simulation calculation result, determining the local optimal value of each corresponding parameter, adjusting the installation position of the ferrite bead, and performing simulation calculation to obtain the local optimal configuration design scheme of the ferrite bead suitable for the power station. The method can effectively and accurately analyze the configuration of the ferrite magnetic ring for inhibiting the VFTO of the given power station, greatly save the protection cost and improve the reliability and effectiveness of the protection.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method of determining a localized optimal configuration design for a ferrite bead to suppress VFTO in accordance with the present invention;
FIG. 2 is a GIS topology structure diagram of the present invention;
FIG. 3 is a diagram of a transformer model with overvoltage transfer in mind according to the present invention;
fig. 4 is a structural view of a high voltage cable of the present invention;
FIG. 5 shows the suppression effect of a single magnetic ring on the VFTO amplitude of each node under different numbers of magnetic rings in the embodiment;
FIG. 6 is a diagram illustrating the suppression effect of a single magnetic ring on the VFTO steepness of each node in different numbers of magnetic rings in the embodiment;
FIG. 7 illustrates the effect of the axial unit length magnetic ring on the suppression of the node VFTO amplitude in an embodiment;
FIG. 8 illustrates the effect of the axial unit length magnetic ring on the suppression of the steepness of the VFTO nodes in an embodiment;
FIG. 9 shows the suppression effect of the magnetic rings per unit length in the radial direction on the amplitude in the embodiment;
FIG. 10 shows the effect of the radial unit length magnetic rings on the steepness suppression in the embodiment;
FIG. 11 is the VFTO amplitudes of the nodes in the example;
FIG. 12 is a graph of VFTC flowing through a GIS conducting rod as a function of magnetic ring resistivity for an embodiment;
FIG. 13 is a schematic diagram of positions of a 500kV GIS of the pumped storage station in the embodiment;
FIG. 14 is a graph illustrating the effect of the ferrite bead on the amplitude of the nodes VFTO and the amplitude of the current flowing through the conductive rod VFTC in one embodiment.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is a method for determining a local optimal configuration design of a ferrite bead for suppressing VFTO, including:
The equivalent circuit model of the invention can be established by using EMTP-RV electromagnetic transient simulation software, comprises a bus, a transformer, a sleeve, a high-voltage cable, an isolating switch, a circuit breaker, a voltage transformer, a metal oxide arrester and an electric arc, the bus adopts a frequency response lossless transmission line model in an FDQ module in EMTP-RV, the transformer adopts a model considering transmission overvoltage, the sleeve adopts a lossless transmission line and an overhead terminal to represent ground capacitance, the high-voltage CABLE adopts a CABLE model of frequency response in the FDQ module, the lossless transmission line is adopted to perform equivalent simulation when the breaker and the isolating switch are closed, the ground capacitance and the fracture capacitance are intensively represented when the breaker and the isolating switch are disconnected, the voltage transformer adopts a centralized capacitance model, the metal oxide arrester adopts a resistance model considering steep wave head response, and the electric arc is simulated by a double-exponential arc resistance model.
Illustratively, a GIS primary side device layout as shown in fig. 2 is established in EMTP-RV software, with a voltage level of 500 kV. The wave impedance of the bus is 67.233 omega, the wave speed is 2.947e8m/s, the resistance per unit length is 9.19 mu omega/m, the model of a power transformer used by the hydropower station is SSP-480000/500, the rated voltage is (520/+/-2 x 2.5%)/18 kV, the rated capacity is 480/480MVA, the connection group is YNd11, the high-voltage side inductance is 0.1217mH, the high-voltage end resistance is 0.5023 omega, the high-voltage ground capacitance is 8.86nF, the inter-winding capacitance is 7.02nF, the low-voltage side inductance is 0.00021mH, the low-voltage side resistance is 0.0008 omega, and the low-voltage ground capacitance is 22.38 nF. A model for the transformer in consideration of overvoltage transmission is shown in fig. 3, and the capacitance to ground of the electromagnetic voltage transformer PT and the capacitance to ground of the capacitor voltage transformer CVT are respectively 200pF and 5048pF according to factory test reports. The oil and gas casing and the air casing have a capacitance to ground of 330pF and 200pF according to factory test reports. When the circuit breaker is in a closed state, the circuit breaker is equivalent by using a lossy transmission line model, wherein the wave impedance is 61.5 omega, the wave speed is 2.9e8m/s, the length is 2.52m, and the loss is 9.19e-6 omega/m. The both ends fracture is 20pF to ground capacitance, and the middle earth capacitance of fracture is 190pF, and fracture capacitance and voltage-sharing capacitance equivalence are 600 pF. The isolating switch has a break capacitance of 15pF and a capacitance to ground of 25 pF. The high-voltage cable model is shown in fig. 4 and comprises a copper core 1, a conductor shield 2 layer, an insulating layer 3, an insulating shield layer 4, a buffer layer 5, a metal sleeve 6 and an outer sheath 7.
and respectively extracting the maximum voltage amplitude, the overshoot coefficient, the maximum voltage gradient, the maximum gradient moment and the main oscillation frequency at the load side and the power supply side of the isolating switch as VFTO waveform representation parameters.
and according to the simulation calculation result, the working condition that the VFTO amplitude is the largest in all the key nodes is defined as the VFTO working condition with the most serious GIS.
the method for determining the optimal ferrite bead configuration number of the suppression effect comprises the following steps:
a trapezoidal network model considering eddy current is used for carrying out equivalence on a single ferrite magnetic ring, and when different numbers of ferrite magnetic rings are additionally arranged, the suppression effect on the VFTO amplitude and gradient of each node of equipment is simulated and researched from 1 number of equipment where the GIS suffers from the most severe VFTO, and the number of the ferrite magnetic rings corresponding to the best suppression effect is obtained as the optimal configuration number.
For example, taking the operating condition of a single GIS outlet transformer as an example, considering the closing operation of the closest isolating switch from the source side in the most severe phase, 1, 5, 10, 20, and 50 ferrite magnetic rings with the size of phi 204mm, phi 184mm, thickness 35mm, and resistivity 3 Ω · cm and the same magnetic permeability are respectively additionally installed on the GIS conducting rod near the source side of the isolating switch, and the rule of the VFTO amplitude of each node changing with the number of the magnetic rings is obtained through EMTP-RV simulation by electromagnetic transient simulation software as shown in Table 1. The suppression effect of a single magnetic ring on the amplitude and gradient of VFTO of each node under different numbers of magnetic rings is shown in fig. 5 and 6, and the number of magnetic rings is good when the suppression effect of a single magnetic ring is not obviously reduced, that is, 10 is the locally optimal number of magnetic rings.
TABLE 1
| N/ |
0 | 1 | 5 | 10 | 20 | 50 |
| Umax-DSL/p.u. | 1.808 | 1.763 | 1.758 | 1.689 | 1.584 | 1.505 |
| Umax-DSS/p.u. | 1.834 | 1.792 | 1.707 | 1.646 | 1.537 | 1.513 |
| Umax-FRH/p.u. | 1.766 | 1.749 | 1.819 | 1.789 | 1.741 | 1.608 |
| Umax-PT/p.u. | 1.698 | 1.674 | 1.638 | 1.535 | 1.388 | 1.181 |
| Umax-TR/p.u. | 1.139 | 1.134 | 1.121 | 1.111 | 1.101 | 1.096 |
| VFTC/kA | 8.92 | 8.60 | 7.46 | 6.50 | 5.41 | 3.45 |
the ferrite magnetic ring is additionally arranged at the position of the GIS equipment suffering from the most severe VFTO, the inner diameter and the outer diameter of the ferrite magnetic ring are kept constant, the axial length of the magnetic ring is modified, the trapezoidal network model parameters of the ferrite magnetic ring considering the eddy current in EMTP-RV electromagnetic transient simulation software are correspondingly changed, the ferrite magnetic ring with different axial lengths is simulated and calculated, the suppression effect on the VFTO amplitude and the gradient of each equipment node is achieved, and the length corresponding to the magnetic ring with the best suppression effect of the ferrite magnetic ring per unit length is taken as the optimal axial length.
Illustratively, 10 magnetic rings with the size of phi 204mm in outer diameter, phi 184mm in inner diameter, 3 Ω · cm in resistivity and the same magnetic characteristics are additionally arranged on the conductive rod near the source side of the isolating switch, and when the axial lengths of the magnetic rings are gradually increased from 25mm to 75mm, the change rule of the VFTO amplitude of each node along with the axial length of the magnetic ring is obtained through simulation, as shown in table 2, the suppression effect of the magnetic ring with axial unit length on the VFTO amplitude and gradient of the node is as shown in fig. 7 and 8, and the length corresponding to the ferrite magnetic ring with the best suppression effect of the ferrite magnetic ring with unit length is selected, namely 4.5mm is the best axial length.
TABLE 2
The ferrite magnetic ring is additionally arranged at the position of the GIS equipment suffering from the most serious VFTO, the inner diameter and the axial length of the ferrite magnetic ring are kept constant, the outer diameter of the magnetic ring is changed, the trapezoidal network model parameters of the ferrite magnetic ring in EMTP-RV electromagnetic transient simulation software considering the eddy current are correspondingly modified, the suppression effect of the ferrite magnetic rings with different outer diameters on the VFTO amplitude and gradient of each equipment node is calculated in a simulation mode, and the outer diameter which corresponds to the ferrite magnetic ring with the optimal suppression effect of the ferrite magnetic ring with the inner diameter and the outer diameter of unit length is the optimal outer diameter.
Illustratively, 10 ferrite magnetic rings with the inner diameter of phi 184mm, the axial length of 3.5mm, the resistivity of 3 omega cm and the same magnetic permeability characteristic are additionally arranged on a conducting rod near the source side of the isolating switch, when the outer diameter is gradually increased from phi 194mm to phi 264mm, the rule of change of VFTO amplitude of each node along with the outer diameter of the magnetic ring is obtained through simulation and is shown in table 3, the inhibition effect of the magnetic ring with radial unit length on the amplitude and the gradient is shown in fig. 9 and fig. 10, and the outer diameter with the ratio of the inner diameter to the outer diameter not more than 0.7 and the best corresponding inhibition effect of the ferrite magnetic ring with the unit length outer diameter is selected, namely 264 is the best outer diameter.
TABLE 3
when selecting the doping material of the ferrite magnetic ring for inhibiting VFTO, the ferrite material of elements and oxides for increasing the magnetic conductivity of the magnetic ring under high frequency is mainly considered; installing ferrite beads at the equipment of the GIS suffering from the most severe VFTO, keeping the optimal configuration quantity, size and magnetic conductivity of the ferrite beads, changing the resistivity of the ferrite beads, correspondingly modifying the parameters of a trapezoidal network model of the ferrite beads considering eddy current in EMTP-RV electromagnetic transient simulation software, carrying out simulation calculation on the VFTO gradient of the first section of the corresponding ferrite bead under different resistivity of the ferrite bead, and selecting the resistivity corresponding to the minimum gradient increment as the optimal resistivity of the ferrite bead; and determining the optimal ferrite bead material according to the determined magnetic conductivity and resistivity.
Illustratively, when 10 ferrite magnetic rings with the same magnetic permeability characteristics and with the outer diameter of phi 204mm, the inner diameter of phi 184mm and the thickness of 35mm are additionally arranged on the conductive rod near the source side of the isolating switch, and the resistivity ρ of the magnetic rings is respectively 2 Ω · cm, 2.5 Ω · cm, 3 Ω · cm, 3.5 Ω · cm and 4 Ω · cm, the suppression effect of the magnetic rings on the VFTO characteristics of each node is studied, and the VFTO amplitude of each node and the VFTC flowing through the GIS conductive rod are changed along with the resistivity of the magnetic rings as shown in fig. 11 and fig. 12. The resistivity rho is selected to be 4 omega cm.
And 7, respectively calculating and researching the suppression effect on the VFTO when the ferrite magnetic rings are installed on equipment at different positions of the GIS based on the determined optimal ferrite magnetic ring configuration number, structural size and material, and obtaining the local optimal configuration design of the GIS ferrite magnetic rings, thereby realizing the effective suppression on the VFTO.
And additionally installing the determined optimal number, size and material of ferrite magnetic rings at different key equipment of the GIS, modifying corresponding parameters of the ferrite magnetic rings in an EMTP-RV electromagnetic transient simulation software in a trapezoidal network model considering eddy current, simulating and calculating the amplitude and gradient of VFTO at each equipment node, and selecting the position with the optimal VFTO inhibition effect to obtain the local optimal configuration design of the ferrite magnetic rings of the GIS station.
Illustratively, 10 ferrite magnetic rings with an inner diameter of phi 184mm, an outer diameter of phi 264mm, an axial length of 3.5mm and a resistivity of 4 Ω · cm are respectively added to D, X, P, Z, T in the 500kV GIS of the pumped storage station, as shown in fig. 13, the influence of the ferrite magnetic rings on the amplitude of each node VFTO and the amplitude of the VFTC flowing through the conducting rod are shown in fig. 14, and the change of the gradient of each node is shown in table 4. In order to effectively inhibit the amplitude and gradient of the VFTC, limit the voltage gradient of winding type equipment and protect the insulation tolerance of each equipment, a ferrite magnetic ring is additionally arranged on a conducting rod near the side of an isolating switch source, namely the position D.
TABLE 4
| Waveform characterizing parameter | D | X | Z | P | T |
| dDSL/kV·ns-1 | 63.29 | 63.29 | 63.29 | 63.29 | 63.29 |
| dDSS/kV·ns-1 | 63.30 | 63.30 | 63.30 | 63.30 | 63.30 |
| dFRH/kV·ns-1 | 99.27 | 60.56 | 60.56 | 60.56 | 60.56 |
| dPT/kV·ns-1 | 18.31 | 13.12 | 12.63 | 13.47 | 34.64 |
| dTR/kV·ns-1 | 2.16 | 2.18 | 2.156 | 2.08 | 1.72 |
| dVFTC/kA·ns-1 | 0.32 | 0.90 | 0.90 | 0.90 | 0.90 |
A system for determining a localized optimal configuration design for a ferrite bead to reject VFTO, comprising:
the GIS equivalent circuit model establishing module is used for establishing a GIS equivalent circuit model of all primary side equipment and networks outside the ferrite magnetic ring under VFTO;
the calculation module is used for carrying out simulation calculation on the GIS actual operation working condition in the GIS equivalent circuit model, extracting VFTO waveform characterization parameters of each equipment node from the calculation result, and the VFTO waveform characterization parameters are used for judging the suppression effect of VFTO;
the working condition determining module is used for determining the working condition of the GIS with the most serious VFTO according to the simulation calculation result of the GIS actual operation working condition;
the ferrite bead configuration number determining module is used for carrying out simulation calculation on different numbers of ferrite beads configured on the GIS equipment suffering from the most severe VFTO based on a simulation calculation result corresponding to the GIS working condition with the most severe VFTO, and determining the ferrite bead configuration number with the optimal suppression effect;
the ferrite bead structure size determining module is used for carrying out simulation calculation on the same number of ferrite beads with different structure sizes additionally arranged on the GIS equipment suffering from the most severe VFTO based on the determined optimal ferrite bead configuration number, and determining the ferrite bead structure size with the optimal inhibition effect;
the ferrite bead material determining module is used for carrying out simulation calculation on the equipment of the GIS suffering from the most severe VFTO by additionally arranging ferrite beads with the same quantity and the same structure size but different materials based on the determined optimal configuration quantity and structure size of the ferrite beads so as to determine the ferrite bead material with the optimal suppression effect;
and the local optimal configuration determining module is used for respectively calculating and researching the suppression effect of the ferrite magnetic rings on the VFTO when the ferrite magnetic rings are additionally arranged on the equipment at different positions of the GIS based on the determined optimal configuration number, structure size and material of the ferrite magnetic rings, so as to obtain the local optimal configuration design of the GIS ferrite magnetic rings.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for determining a local optimal configuration design of a ferrite bead for suppressing VFTO is characterized by comprising the following steps:
step 1, establishing a GIS equivalent circuit model of all primary side equipment and networks outside a ferrite magnetic ring under VFTO;
step 2, performing simulation calculation on the GIS actual operation condition in a GIS equivalent circuit model, and extracting VFTO waveform characterization parameters of each equipment node from the calculation result, wherein the VFTO waveform characterization parameters are used for judging the suppression effect of VFTO;
step 3, determining the working condition of the GIS with the most serious VFTO according to the simulation calculation result of the GIS actual operation working condition;
step 4, based on a simulation calculation result corresponding to the working condition that the GIS has the most serious VFTO, performing simulation calculation on different numbers of ferrite beads configured on the GIS equipment suffering from the most serious VFTO to determine the number of ferrite beads configured with the optimal suppression effect;
step 5, based on the determined optimal configuration number of the ferrite magnetic rings, adding the same number of ferrite magnetic rings with different structural sizes to the GIS equipment suffering from the most severe VFTO for simulation calculation, and determining the structural size of the ferrite magnetic ring with the optimal suppression effect;
step 6, based on the determined configuration number and the determined structure size of the optimal ferrite bead, adding the same number of ferrite beads with the same structure size but different materials to the GIS equipment suffering from the most severe VFTO for simulation calculation, and determining the ferrite bead material with the optimal inhibition effect;
and 7, respectively calculating and researching the suppression effect of the ferrite magnetic rings on the VFTO when the ferrite magnetic rings are additionally arranged on the equipment at different positions of the GIS based on the determined optimal configuration number, structure size and material of the ferrite magnetic rings, and obtaining the local optimal configuration design of the GIS ferrite magnetic rings.
2. The method as claimed in claim 1, wherein in step 1, the equivalent circuit model is created by using EMTP-RV electromagnetic transient simulation software, and the equivalent circuit model includes a bus, a transformer, a bushing, a high voltage cable, a disconnector, a circuit breaker, a voltage transformer, a metal oxide arrester, and an arc model.
3. The method as claimed in claim 2, wherein the bus model is a frequency response lossless transmission line model in an FDQ module in an EMTP-RV; the transformer model adopts a model considering the transmission of overvoltage; the sleeve model adopts a lossless transmission line and an overhead end-to-ground capacitance model; the high-voltage CABLE model adopts a CABLE model of frequency response in the FDQ module; when the circuit breaker and the isolating switch model are closed, equivalent simulation is carried out by adopting a lossless transmission line, and when the circuit breaker and the isolating switch model are disconnected, simulation is carried out by adopting a centralized ground capacitor and a fracture capacitor; the voltage transformer model adopts a centralized capacitor model; the metal oxide arrester model adopts a nonlinear resistor/capacitor model considering the response of a steep wave head; the arc model uses a double-exponential arc resistance model.
4. The method as claimed in claim 1, wherein in step 2, the VFTO waveform characterizing parameters include maximum voltage amplitude, overshoot factor, maximum voltage gradient, maximum gradient time and main oscillation frequency at each equipment node under each actual working condition.
5. The method as claimed in claim 1, wherein said step 3 of determining the operating mode of the GIS where the most severe VFTO occurs is to: and determining the working condition with the highest VFTO amplitude as the most serious working condition and the node equipment with the highest VFTO amplitude as the most serious equipment suffering from VFTO according to the VFTO waveform characterization parameters of each equipment node under various actual working conditions.
6. The method as claimed in claim 1, wherein the step 4 of determining the number of ferrite bead configurations with optimal suppression effect comprises:
a trapezoidal network model considering eddy current is used for carrying out equivalence on a single ferrite magnetic ring, and when different numbers of ferrite magnetic rings are additionally arranged at the equipment where the GIS suffers from the most severe VFTO, the suppression effect on the VFTO amplitude and gradient of each node of the equipment is researched by simulation from the number of 1, so that the number of the corresponding ferrite magnetic rings is the optimal configuration number when the suppression effect of the single magnetic ring is not obviously reduced.
7. The method as claimed in claim 1, wherein the step 5 of determining the structural size of the ferrite bead with the best suppression effect comprises:
installing a ferrite magnetic ring at the position of the GIS equipment suffering from the most severe VFTO, keeping the inner diameter and the outer diameter of the ferrite magnetic ring constant, modifying the axial length of the magnetic ring, correspondingly changing the trapezoidal network model parameters of the ferrite magnetic ring considering the eddy current in EMTP-RV electromagnetic transient simulation software, performing simulation calculation on the ferrite magnetic ring with different axial lengths, and taking the length corresponding to the ferrite magnetic ring with the best suppression effect of the ferrite magnetic ring per unit length as the optimal axial length to suppress the VFTO amplitude and the gradient of each equipment node;
the ferrite magnetic ring is additionally arranged at the position of the GIS equipment suffering from the most serious VFTO, the inner diameter and the axial length of the ferrite magnetic ring are kept constant, the outer diameter of the magnetic ring is changed, the trapezoidal network model parameters of the ferrite magnetic ring in EMTP-RV electromagnetic transient simulation software considering the eddy current are correspondingly modified, the suppression effect of the ferrite magnetic rings with different outer diameters on the VFTO amplitude and gradient of each equipment node is calculated in a simulation mode, and the outer diameter which corresponds to the ferrite magnetic ring with the optimal suppression effect of the ferrite magnetic ring with the inner diameter and the outer diameter of unit length is the optimal outer diameter.
8. The method as claimed in claim 1, wherein the step 6 of determining the ferrite bead material with the best suppression effect comprises:
when selecting the doping material of the ferrite bead for inhibiting VFTO, selecting the ferrite material doped with elements and oxides for improving the magnetic conductivity of the ferrite bead under high frequency;
installing ferrite beads at the equipment of the GIS suffering from the most severe VFTO, keeping the optimal configuration quantity, size and magnetic conductivity of the ferrite beads, changing the resistivity of the ferrite beads, correspondingly modifying the parameters of a trapezoidal network model of the ferrite beads considering eddy current in EMTP-RV electromagnetic transient simulation software, carrying out simulation calculation on the VFTO gradient of the first section of the corresponding ferrite bead under different resistivity of the ferrite bead, and selecting the resistivity corresponding to the minimum gradient increment as the optimal resistivity of the ferrite bead; and determining the optimal ferrite bead material according to the determined magnetic conductivity and resistivity.
9. The method as claimed in claim 1, wherein in step 7, the suppression effect of the ferrite bead on the VFTO when the ferrite bead is mounted on the devices at different locations of the GIS is calculated and studied respectively based on the determined optimal ferrite bead configuration number, configuration size and material, and specifically as follows:
the method comprises the steps of additionally installing the determined optimal configuration number, structure size and material of ferrite magnetic rings at different equipment nodes of the GIS, modifying corresponding parameters of the ferrite magnetic rings in an EMTP-RV electromagnetic transient simulation software in a trapezoidal network model considering eddy current, performing simulation calculation on the amplitude and gradient of VFTO at each equipment node, and selecting the position with the optimal VFTO inhibition effect to obtain the local optimal configuration design of the ferrite magnetic rings of the GIS station.
10. A system for determining a localized optimal configuration design for a ferrite bead to reject VFTO, comprising:
the GIS equivalent circuit model establishing module is used for establishing a GIS equivalent circuit model of all primary side equipment and networks outside the ferrite magnetic ring under VFTO;
the calculation module is used for carrying out simulation calculation on the GIS actual operation working condition in the GIS equivalent circuit model, extracting VFTO waveform characterization parameters of each equipment node from the calculation result, and the VFTO waveform characterization parameters are used for judging the suppression effect of VFTO;
the working condition determining module is used for determining the working condition of the GIS with the most serious VFTO according to the simulation calculation result of the GIS actual operation working condition;
the ferrite bead configuration number determining module is used for carrying out simulation calculation on different numbers of ferrite beads configured on the GIS equipment suffering from the most severe VFTO based on a simulation calculation result corresponding to the GIS working condition with the most severe VFTO, and determining the ferrite bead configuration number with the optimal suppression effect;
the ferrite bead structure size determining module is used for carrying out simulation calculation on the same number of ferrite beads with different structure sizes additionally arranged on the GIS equipment suffering from the most severe VFTO based on the determined optimal ferrite bead configuration number, and determining the ferrite bead structure size with the optimal inhibition effect;
the ferrite bead material determining module is used for carrying out simulation calculation on the equipment of the GIS suffering from the most severe VFTO by additionally arranging ferrite beads with the same quantity and the same structure size but different materials based on the determined optimal configuration quantity and structure size of the ferrite beads so as to determine the ferrite bead material with the optimal suppression effect;
and the local optimal configuration determining module is used for respectively calculating and researching the suppression effect of the ferrite magnetic rings on the VFTO when the ferrite magnetic rings are additionally arranged on the equipment at different positions of the GIS based on the determined optimal configuration number, structure size and material of the ferrite magnetic rings, so as to obtain the local optimal configuration design of the GIS ferrite magnetic rings.
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