CN113009270B - Arc suppression coil compensation effect evaluation method by using temporary steady state information before and after arc suppression - Google Patents
Arc suppression coil compensation effect evaluation method by using temporary steady state information before and after arc suppression Download PDFInfo
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Abstract
An arc suppression coil compensation effect evaluation method utilizing temporary steady state information before and after arc suppression belongs to the technical field of power system distribution network automation. In a system with a neutral point grounded through an arc suppression coil, the reasonable configuration of the arc suppression coil relates to a series of problems such as compensation degree adjustment, fault point residual current control and the like. Transient information before and after the neutral point is extinguished through a single-phase ground fault point arc of an arc suppression coil grounding system is utilized, transient information such as main resonance angular frequency and attenuation factors after the fault point arc is extinguished is measured, the detuning degree of the system is calculated, and the residual current of the fault point is calculated by combining the current of the arc suppression coil before the fault point arc is extinguished, so that the compensation effect of the arc suppression coil is evaluated. The invention does not need to add any special measuring equipment or adjust primary equipment, and has higher safety.
Description
Technical Field
The invention belongs to the technical field of power system distribution network automation, relates to arc suppression coil compensation effect evaluation, and particularly provides an arc suppression coil compensation effect evaluation method utilizing temporary steady state information before and after arc extinction aiming at a neutral point through an arc suppression coil grounding system.
Technical Field
At present, for a system with a neutral point grounded through an arc suppression coil, the control of fault point residual current when a single-phase ground fault occurs is mainly realized through the arc suppression coil, a residual current transfer device and the like, but because a fault transfer switch of the residual current transfer device is inherently long in time delay, the requirement for rapidity of arc suppression is difficult to meet, and the capacitance current of the system cannot be reduced through fault transfer, if the device is embedded into a ground with large current, the ground potential can be increased, and the threat to personal safety can be brought. Therefore, the arc suppression coil plays an important role in controlling the residual current at the fault point. However, if the configuration of the arc suppression coil is not reasonable, the detuning degree of the system may be too large or too small, so that the residual current at the fault point is increased, the arc suppression effect of the system is affected, and phenomena such as resonance or beat frequency may be generated, which causes a relatively serious overvoltage, and increases the fault hazard degree. Therefore, the management of the operation and maintenance of the arc suppression coil and the evaluation of the compensation effect are more and more focused.
In the prior art, the management work for the operation and maintenance of the arc suppression coil in the system with the neutral point grounded through the arc suppression coil mainly focuses on the aspect of determining the compensation quantity of the arc suppression coil according to the capacitance current of a measurement system, and a method for evaluating the compensation effect of the arc suppression coil is lacked. At present, most methods for measuring the capacitance current of the system are active measurement methods, such as a signal injection method, an impedance bias method, a neutral point impedance method and the like. The signal injection method determines the system capacitance current by applying a single frequency or a multi-frequency signal to a voltage transformer and measuring the amplitude and phase of the output signal. In the bias impedance method, a line is grounded through a certain large impedance, and the current and voltage are measured to calculate the capacitance current. In the neutral impedance method, the neutral point impedance is adjusted, and then the neutral point voltage amplitude is measured multiple times, so that the system capacitance to ground is obtained. The above method for measuring the capacitance and current of the system is complex in operation, needs to use one-time equipment for operation, has certain dangerousness, and has measurement accuracy influenced by various factors. Therefore, in order to ensure that a proper compensation amount of the arc suppression coil is selected, a method for evaluating the compensation effect of the arc suppression coil, which is low in cost, simple to operate and accurate in result, needs to be found.
In the neutral point through arc suppression coil grounding system, the compensation mode of arc suppression coil mainly divide into 3, wherein, full compensation mode is not advisable, though can effectively avoid intermittent type nature arc light overvoltage, but the system satisfies series resonance's condition this moment, under zero sequence voltage's effect, produces very big current in series resonance circuit easily, and this current produces very high voltage drop on the arc suppression coil, causes the system neutral point to rise to ground voltage seriously, makes equipment insulation suffer destruction. The under-compensation mode is not suitable to be adopted, the residual current of a fault point is still capacitive, once the operation mode is changed or some circuits are repaired and cut off, the capacitance current of the system to the ground is reduced, and the series resonance condition can also occur, so that the overvoltage is caused. Therefore, an overcompensation method is generally used in practice, and the detuning degree v is generally selected from-5% to-10%.
Before the single-phase earth fault point of the system is extinguished, the current of the fault point is reduced due to the compensation effect of the arc suppression coil, and according to the regulations of overvoltage protection and insulation coordination of alternating current electrical devices (GB/T50064-. In order to reflect the general situation when the system has a single-phase earth fault, the arc suppression coil current before the arc extinction at the fault point needs to be converted into the arc suppression coil current at the rated bus voltage when the system has a metallic single-phase earth fault, and the corresponding actual fault point residual current also needs to be converted into the fault point residual current at the rated bus voltage when the system has a metallic single-phase earth fault. In order to reflect the most serious condition when the system has single-phase earth fault, the power supply voltage deviation and the size of the earth resistance of the power distribution network system need to be taken into consideration when calculating the residual current of the fault point, according to the regulations of 'power quality supply voltage allowance deviation' (GB/T12325-2008) and the like, the sum of the absolute values of the positive and negative differences of the power supply voltage of 35kV and above is not more than 10% of the nominal voltage, and the deviation of the three-phase power supply voltage of 20kV and below is +/-7% of the nominal voltage, therefore, when the ground resistance exists in the fault point, the arc suppression coil current before the arc extinction of the fault point needs to be converted into the arc suppression coil current under the maximum bus voltage when the system has metallic single-phase earth fault, and the corresponding actual residual current of the fault point is also converted into the residual current under the maximum bus voltage when the system has metallic single-phase earth fault. The magnitude of the fault point residual current cannot be directly obtained in the actual process, but can be obtained by calculating the arc suppression coil current and the detuning degree in the invention.
After the arc of the single-phase earth fault point of the system is extinguished, the transient process of the system is a zero input response in a non-zero state. Therefore, the transient process is only related to the compensation inductance (including the arc suppression coil inductance and the grounding transformer inductance), the system ground capacitance and the system equivalent impedance, and is not related to the fault point state (such as the grounding resistance, the arc stability degree and the like), that is: the transient information after the arc of the fault point is extinguished can be used for reflecting the constraint relation between the inductance value of the arc suppression coil and the capacitance value of the system to the ground. Therefore, under the condition that the system structure is fixed, the capacitance value of the system to the ground is also fixed, the detuning degree of the system can be calculated according to the transient information after the arc of the fault point is extinguished, the compensation effect of the arc suppression coil is further evaluated, and the adjustment work of the arc suppression coil is guided.
Disclosure of Invention
The method for comprehensively utilizing the transient stable state information before and after the arc of the fault point is extinguished aims at solving the problem of evaluating the compensation effect of the arc suppression coil of the system with the neutral point grounded through the arc suppression coil, and has guiding significance for the work of compensation quantity adjustment of the arc suppression coil, residual current control of the fault point, operation of a power distribution network and the like.
A method for evaluating the compensation effect of an arc suppression coil by using temporary steady state information before and after arc suppression comprises the following basic working processes:
1. in a system with a neutral point grounded through an arc suppression coil, a method for evaluating the compensation effect of the arc suppression coil by using temporary steady state information before and after arc extinction comprises the following steps:
(1) recording system bus zero sequence voltage u before single-phase earth fault point arc extinction of neutral point through arc suppression coil earth system 01 And the zero sequence voltage u of the system bus after the arc of the fault point is extinguished 02 And arc suppression coil current i before arc extinction at fault point L1 Arc suppression coil current i after arc extinction at fault point L2 Isoelectric gas content;
(2) according to the formula
Arc suppression coil current i before extinguishing fault point arc L1 Effective value of (I) L1 Converted into an effective value I of the arc suppression coil current under the rated bus voltage when the system has metallic single-phase earth fault L1N Wherein, U 01 Bus zero-sequence voltage u of system before arc extinction for fault point 01 Effective value of U N Rated voltage of the system;
(3) according to the formula
Arc suppression coil current i before extinguishing fault point arc L1 Effective value of (I) L1 Converted into the effective value I of the arc suppression coil current under the maximum bus voltage when the system has metallic single-phase earth fault L1,max Wherein k is the maximum allowable voltage and the rated voltage U of the power distribution network system N The ratio of (A) to (B);
(4) calculating the zero-sequence voltage u of the system bus after the arc of the fault point is extinguished according to the equiphase measurement algorithm of the Prony algorithm and the matrix xpencil algorithm 02 Main resonance angular frequency ω of h And attenuation factor delta h Iso-transient information;
(5) according to the formula
Calculating the system detuning degree v when the system has single-phase earth fault, wherein omega 0 The angular frequency is the power frequency;
(6) according to the formula
Calculating the actual fault point residual current I before the arc of the fault point is extinguished f ；
(7) According to the formula
Calculating fault point residual current I under rated voltage of bus when metallic single-phase earth fault occurs in system fN ；
(8) According to the formula
Maximum fault point residual current I when metallic single-phase earth fault occurs in computing system f,max ；
(9) Evaluating the compensation effect of the arc suppression coil according to the detuning degree of the system and the residual current of the maximum fault point,
when v < 0 and I f,max ＞I f1 Then, the evaluation result is: the over-compensation amount of the arc suppression coil is too large, the compensation amount of the arc suppression coil needs to be reduced,
when v < 0 and I f1 ＜I f,max ＜I f2 Then, the evaluation result is: the compensation effect of the arc suppression coil is better, the compensation quantity of the arc suppression coil does not need to be readjusted,
when v < 0 and 0 < I f,max ＜I f2 Then, the evaluation result is: the overcompensation amount of the arc suppression coil is too small,the system may have the risk of series resonance, the compensation amount of the arc suppression coil needs to be increased,
when v > 0 and I f,max If < 0, the evaluation results are: the system is in an under-compensation state and needs to readjust the compensation quantity of the arc suppression coil, wherein I f1 And I f2 Is two set values, and I f1 ＞I f2 ＞0。
2. In step (2) of flow 1, k is 1.07 for a power distribution grid system of 20kV and below; for power distribution grid systems of 35kV and above, k is 1.10.
3. In the step (3) of the process 1, the zero sequence voltage u of the system bus is obtained after the arc of the fault point is extinguished 02 Can be replaced by arc suppression coil current i after the arc of the fault point is extinguished L2 Or zero sequence voltage or zero sequence current at any position on the line, for calculating the main resonance angular frequency ω h And attenuation factor delta h And waiting for transient information.
4. In the step (4) of scheme 1, when ω is h ＞＞δ h Equation of time
Can be replaced by
The method is used for calculating the system detuning degree v when the system has single-phase earth fault.
5. In step (7) of scheme 1, the formula
Can be replaced by formulas
The method is used for calculating the fault point residual current under the rated voltage of the bus when the system has a metallic single-phase earth fault.
6. In step (8) of scheme 1, the formula
Can be replaced by formulas
For calculating the maximum point of failure residual flow.
7. In step (8) of scheme 1, the formula
Can be replaced by formula I f,max ＝kI fN And the method is used for calculating the maximum fault point residual flow.
8. In the step (9) described in scheme 1, I f1 The constant value range is 10-20A, generally 15A, I f2 The constant value range is 0-2A, generally 1A.
The method processes the transient state information of bus zero sequence voltage, arc suppression coil current and the like before and after single-phase earth fault point arc extinction occurs in a neutral point through an arc suppression coil grounding system, calculates the system detuning degree and the fault point residual current, and evaluates the compensation effect of the arc suppression coil according to the system detuning degree and the fault point residual current. Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, after a single-phase earth fault occurs in the system, the detuning degree and fault point residual current of the system can be calculated by comprehensively utilizing fault transient state information, so that the compensation effect of the arc suppression coil is evaluated, and the adjustment work of the arc suppression coil is guided;
2. the invention does not need separate measuring equipment, and can complete signal measurement by utilizing the existing bus voltage transformer and arc suppression coil current transformer of the system;
3. the invention does not need to directly measure the capacitance current of the system, does not need to operate primary equipment, and has higher safety;
4. the invention is suitable for the random adjustment type arc suppression coil and the preset adjustment type arc suppression coil, and has stronger applicability.
Drawings
The invention is further described with reference to the following detailed description and accompanying drawings:
fig. 1 is a system schematic wiring diagram of a crowbar coil controller;
FIG. 2 is a system schematic wiring diagram of a low current ground fault line selection apparatus;
FIG. 3 is a typical 10kV power distribution network system architecture used in the simulation;
FIG. 4 is a flow chart of the method for evaluating the compensation effect of the arc suppression coil according to the invention;
FIG. 5 is a simulation verification of a bus zero sequence voltage waveform, an arc suppression coil current waveform and a fault point residual current waveform when a single-phase earth fault occurs in a system obtained by simulation verification;
FIG. 6 is a diagram showing a bus zero-sequence voltage waveform, an arc suppression coil current waveform and a fault point residual current waveform when a single-phase earth fault occurs in a system obtained by simulation verification II;
fig. 7 shows the waveform of the zero sequence voltage of the bus, the waveform of the arc suppression coil current and the waveform of the residual current of the fault point when the system obtained by the three steps of simulation verification occurs single-phase earth fault.
Detailed Description
In order to achieve the above purpose, the present invention can be realized by the following technical scheme:
1. technical scheme of arc suppression coil compensation effect evaluation method based on arc suppression coil controller
The arc suppression coil controller can automatically control the arc suppression coil accurately and reliably, and generally has display and storage functions, namely: the current state of the system, such as neutral point voltage, arc suppression coil current and other information can be displayed in real time when the system normally operates, and the neutral point voltage, the arc suppression coil current value, the starting time of the ground fault and other information can be displayed and stored when the system has a single-phase ground fault.
As shown in fig. 1, after a single-phase ground fault occurs in the system, the arc suppression coil controller sends out predetermined compensation gear information to the adjustable arc suppression coil, the arc suppression coil is adjusted to compensate the system capacitance current, then the compensation effect of the arc suppression coil is evaluated according to signals such as arc suppression coil current measured by a current transformer and system bus voltage measured by a voltage transformer before and after the arc is extinguished, whether the input of the arc suppression coil effectively limits residual current of a fault point is judged until the fault electric quantity disappears is judged, and the arc suppression coil is adjusted to be restored to a maximum overcompensation state far away from the resonance point. In the process, the real-time information of the current system state and the evaluation feedback of the compensation effect of the arc suppression coil are displayed through a display and a man-machine interaction window. The working flow for evaluating the preset arc suppression coil is similar to the above.
2. Method for realizing evaluation of compensation effect of arc suppression coil based on small-current ground fault line selection device
The small current ground fault line selection device can analyze and process according to data measured by a voltage transformer and a current transformer or waveforms recorded by a fault recorder, and the like, so that the line selection problem of the small current ground fault is solved, and a common small current ground fault line selection analysis method comprises the following steps: the method comprises a line selection method based on power frequency zero sequence current, a line selection method based on active current or active power direction, a novel transient line selection method, an artificial intelligence line selection method and the like. In order to realize the method for evaluating the compensation effect of the arc suppression coil, the current of the arc suppression coil measured by the current transformer needs to be connected to a small-current ground fault line selection device.
As shown in fig. 2, after a single-phase ground fault occurs in the system, a fault interruption service program is started, and according to signals such as various appearing currents and arc suppression coil currents measured by current transformers before and after the arc is extinguished and system bus voltages measured by voltage transformers, on one hand, a fault line is selected and an alarm is given out through the single-phase ground fault line selection program, and on the other hand, according to the arc suppression coil compensation effect evaluation method of the present invention, whether the input of the arc suppression coil effectively limits the residual current of the fault point is judged until the fault electric quantity disappears, the fault interruption service program is exited, and the device is restored to the fault detection state. In the process, fault information of the single-phase earth fault and evaluation feedback of the compensation effect of the arc suppression coil are displayed through a display and a man-machine interaction window.
Matlab/Simulink simulation verification
As shown in FIG. 3, in a typical 10kV power distribution network system adopted by simulation, 8 outgoing lines are provided in total, including cable lines, overhead lines and mixed lines, and the line distribution parameters of different line types are shown in Table 1, wherein R is 0u 、L 0u And C 0u Respectively, distributed resistance, inductance and capacitance parameters. Grounding resistor R for setting single-phase grounding fault in simulation mode f ＝100Ω。
TABLE 1 overhead line and Cable line distribution parameters
After the system has single-phase earth fault, the zero-sequence voltage of bus and the current of arc suppression coil u are recorded by PT and CT respectively 0 For the system bus zero sequence voltage, i L For the arc suppression coil current, the fault point residual current waveform cannot be directly measured in practical situations, but can be obtained in simulation verification and used for verifying the correctness of the algorithm. Then, according to the flow shown in FIG. 4, the arc suppression coil compensation effect evaluation method is performed, and in this simulation verification, I is set f1 10A and I f2 ＝1A。
(1) Firstly, simulation verification: excessive compensation of arc suppression coil
After the single-phase earth fault occurs in the system of this embodiment, the zero sequence voltage of the system bus and the arc suppression coil current are recorded, as shown in fig. 5. And selecting data of a period of time before the arc of the fault point is extinguished, and calculating an effective value of the arc suppression coil current and an effective value of the zero sequence voltage of the system bus by utilizing Fourier decomposition. In this case, the effective value of the arc-extinguishing coil current is calculated as I L1 57.43A, the effective value of the zero sequence voltage of the system bus is U 01 4.85kV, so that the effective value of the arc suppression coil current under the rated bus voltage when the system generates the metallic single-phase earth fault is converted into I L1N 68.39A, the effective value of the arc suppression coil current under the maximum bus voltage when the system has a metallic single-phase earth fault is I L1,max ＝73.18A。
Selecting data of a period of time after the arc of the fault point is extinguished, and calculating the main resonance angular frequency omega of the zero-sequence voltage of the system bus or the arc suppression coil current by using a matrix xpencil algorithm h And attenuation factor delta h . In this case, the main resonance of the zero sequence voltage and the arc suppression coil current of the system bus is calculatedAngular frequencies are all omega h 396.60rad/s, attenuation factor δ h ＝13.00s -1 . From the principal resonance angular frequency and the attenuation factor, a formula can be used
The system detuning degree v is calculated to be-59.54%.
Therefore, the actual fault point residual flow obtained by calculation is I f When the actual fault point residual flow is I, 21.43A, the simulation result shows that f 21.63A, and the effective value converted into residual current at the fault point under rated bus voltage when the system has metallic single-phase earth fault is I fN When the system has metallic single-phase earth fault, the effective value of the residual current at the fault point under the maximum bus voltage is I f,max 27.40A. At the moment, the over-compensation degree of the system is overlarge, and the residual current of the fault point is overlarge, so that the arc extinguishing of the fault point is not facilitated, and therefore the arc extinguishing coil needs to be adjusted.
(2) And (2) simulation verification: better example of compensation effect of arc suppression coil
After the single-phase earth fault occurs in the system of this embodiment, the zero sequence voltage of the system bus and the arc suppression coil current are recorded, as shown in fig. 6. Similarly, the effective value of the arc suppression coil current before the arc of the fault point is extinguished is calculated to be I L1 When the system generates metallic single-phase earth fault, the effective value of the arc-extinguishing coil current under the rated bus voltage is I L1N When the system has metallic single-phase earth fault, the effective value of the arc-extinguishing coil current under the maximum bus voltage is I (45.31A) L1,max 48.48A, the main resonance angular frequency is omega after the arc of the fault point is extinguished h 323.14rad/s and an attenuation factor δ h ＝8.44s -1 。
At this time, the detuning degree is-5.87%, and the calculated actual fault point residual current is I f 2.40A, the actual fault point residual flow obtained by simulation is I f When the metallic single-phase earth fault occurs in the system, the effective value of the residual current at the fault point under the rated bus voltage is converted into I fN 2.52A, the effectiveness of the fault point residual current at the maximum bus voltage when the system has a metallic single-phase earth faultA value of I f,max The compensation effect of the arc suppression coil has been adjusted to a good level 2.69A.
(3) And (3) simulation verification: example of excessively small overcompensation amount of arc suppression coil
After the single-phase earth fault occurs in the system of this embodiment, the zero sequence voltage of the system bus and the arc suppression coil current are recorded, as shown in fig. 7. Similarly, the effective value of the current of the arc suppression coil before the arc of the fault point is extinguished is calculated to be I L1 41.43A, and I is the effective value of the arc-extinguishing coil current under the rated bus voltage when the system generates the metallic single-phase earth fault L1N When the system has metallic single-phase earth fault, the effective value of the arc-extinguishing coil current under the maximum bus voltage is I L1,max 46.19A, and the main resonance angular frequency is omega after the arc of the fault point is extinguished h 315.75rad/s and an attenuation factor δ h ＝7.46s -1 。
At this time, the detuning degree is 1.07% to 1, and the calculated actual fault point residual current is I f When the actual fault point residual flow is I, the simulation result is 0.44A f 2.42A, and the effective value converted into residual current at the fault point under rated bus voltage when the system has metallic single-phase earth fault is I fN When the system generates metallic single-phase earth fault, the effective value of the residual current of the fault point under the maximum bus voltage is I f,max At 0.49A, the crowbar coil limits the fault point residual current to close to 0 while the system is still in an overcompensation state, but at this point the system will likely be at risk of series resonance.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (8)
1. An arc suppression coil compensation effect evaluation method by using temporary steady state information before and after arc suppression is characterized in that:
step (1): recording system bus zero sequence voltage u before single-phase earth fault point arc extinction of neutral point through arc suppression coil earth system 01 And the zero sequence voltage u of the system bus after the arc of the fault point is extinguished 02 And arc suppression coil current i before arc extinction of fault point L1 Arc suppression coil current i after arc extinction at fault point L2 ；
Step (2): according to the formula
Current i of arc suppression coil before extinguishing fault point arc L1 Effective value of (I) L1 Converted into an effective value I of the arc suppression coil current under the rated bus voltage when the system has metallic single-phase earth fault L1N Wherein, U 01 Bus zero-sequence voltage u of system before arc extinction for fault point 01 Effective value of U N Rated voltage of the system;
and (3): according to the formula
Arc suppression coil current i before extinguishing fault point arc L1 Effective value of (I) L1 Converted into the effective value I of the arc suppression coil current under the maximum bus voltage when the system has metallic single-phase earth fault L1,max Wherein k is the maximum allowable voltage and the rated voltage U of the power distribution network system N The ratio of (A) to (B);
and (4): calculating zero-sequence voltage u of system bus after arc extinction at fault point 02 Main resonance angular frequency ω of h And attenuation factor delta h ；
And (5): according to the formula
Calculating the system detuning degree v when the system has single-phase earth fault, wherein omega 0 The angular frequency is the power frequency;
and (6): according to the formula
Calculating the actual fault point residual current I before the arc of the fault point is extinguished f ；
And (7): according to the formula
Fault point residual current I under rated bus voltage when computing system generating metallic single-phase earth fault fN ；
And (8): according to the formula
Maximum fault point residual current I when metallic single-phase earth fault occurs in computing system f,max ；
And (9): evaluating the compensation effect of the arc suppression coil according to the detuning degree of the system and the residual current of the maximum fault point,
when v < 0 and I f,max ＞I f1 Then, the evaluation result is: the over-compensation amount of the arc suppression coil is too large, the compensation amount of the arc suppression coil needs to be reduced,
when v < 0 and I f2 ≤I f,max ≤I f1 Then, the evaluation result is: the compensation effect of the arc suppression coil is better, the compensation quantity of the arc suppression coil does not need to be readjusted,
when v is less than or equal to 0 and I f,max ＜I f2 Then, the evaluation result is: overcompensation of arc suppression coilSmall, the system may have the risk of series resonance, the compensation amount of the arc suppression coil needs to be increased,
when v > 0, the evaluation results are: the system is in an under-compensation state, the compensation quantity of the arc suppression coil needs to be readjusted,
wherein, I f1 And I f2 Is two set values, and I f1 ＞I f2 ＞0。
2. The method of claim 1, wherein: in the step (3), k is 1.07 for the power distribution network system of 20kV or less; for distribution grid systems of 35kV and above, k is 1.10.
3. The method of claim 1, wherein: and (4) after the arc of the fault point is extinguished, generating line zero-sequence voltage u of the system 02 Can be replaced by arc suppression coil current i after the arc of the fault point is extinguished L2 Or zero sequence voltage or zero sequence current at any position on the line, for calculating the main resonance angular frequency ω h And attenuation factor delta h 。
4. The method of claim 1, wherein: in step (5), when ω is h ＞＞δ h Time, formula
Can be replaced by
The method is used for calculating the system detuning degree v when the system has single-phase earth fault.
5. The method of claim 1, wherein: formula in step (7)
Can be replaced by formulas
The method is used for calculating the fault point residual current under the rated bus voltage when the system has a metallic single-phase earth fault.
6. The method of claim 1, wherein: formula in step (8)
Can be replaced by formulas
For calculating the maximum fault point residual flow.
7. The method of claim 1, wherein: formula in step (8)
Can be replaced by formula I f,max ＝kI fN And the method is used for calculating the maximum fault point residual flow.
8. The method of claim 1, wherein: step (9) wherein f1 The constant value range is 10-20A, I f2 The constant value range is 0-2A.
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| CN105610147A (en) * | 2016-03-24 | 2016-05-25 | 福州大学 | Distribution network ground fault arc suppression method based on three-phase cascade H bridge converters |
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