CN112165079B - Method and device for designing current-limiting reactor of ground fault full-compensation system - Google Patents
Method and device for designing current-limiting reactor of ground fault full-compensation system Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The present application provides aThe design method and device of the current-limiting reactor of the earth fault full compensation system comprise the following steps: obtaining capacitance current I of power grid system c (ii) a According to the capacitive current I of the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor base (ii) a According to rated thermal short-circuit current I base Calculating the rated continuous current I of the current-limiting protection reactor E (ii) a According to rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor L (ii) a According to rated reactance value X of current-limiting protection reactor L And rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor L So that the rated reactance value contained in the earth fault current full compensation system is X L Rated capacity of S L When the power grid system has ground fault and the ground fault current full compensation system judges the ground fault phase wrongly, the current limiting reactor limits the ground fault current in the ground fault phase below a preset threshold value. The safety of the power grid system can be protected.
Description
Technical Field
The application relates to the technical field of power systems, in particular to a method and a device for designing a current-limiting reactor of a ground fault full-compensation system.
Background
The single-phase earth fault of the power distribution network at home and abroad accounts for more than 80 percent, the safe operation of the power grid and equipment is seriously influenced, and the safe processing of the earth fault plays an important role in social and economic development. When the capacitance current of the system is more than 10A, an arc suppression coil grounding mode is adopted. The arc suppression coil can reduce the fault current to a certain extent, the system can operate for 2 hours with faults, but the arc suppression coil can not realize full compensation, residual current smaller than 10A still exists at a fault point, the residual current can cause personal electric shock and fire accidents, and the safe and stable operation of a power grid and equipment is seriously threatened. When the capacitance current of the system is large, a small-resistance grounding mode is mostly adopted, when a single-phase grounding fault occurs, the zero sequence current of a fault line is amplified, and the relay protection device quickly removes the fault line.
In order to thoroughly eliminate the damage of the single-phase earth fault and ensure the power supply reliability, various methods for completely compensating the current of the single-phase earth fault point are provided at home and abroad. For example: the GFN (ground fault neutralizer) manufactured by Swedishneutral in Sweden is a representative one, and the GFN utilizes an active power supply of power electronics to realize the full compensation of the ground fault, and a method (CN102074950A) for extinguishing and protecting the ground fault of a power distribution network belongs to the active full compensation in technical principle. On the other hand, there are also patents (CN201910992110.3, CN201910992109.0, etc.) for a system and a method for compensating for a ground fault current of a self-generated phase power supply, which have certain advantages in terms of cost and stability because of using a phase power supply converter and no power electronic power supply.
However, regardless of the full compensation technique, the ground fault current compensation system needs to determine the ground fault phase and then perform ground compensation. Once a phase-judging error occurs, the earth fault current compensation system will mistakenly switch into a non-fault phase, resulting in a larger fault current occurring at an earth fault point. The fault current may exceed the current carrying capacity of the lines of the grid system, compromising the safety of the grid system.
Disclosure of Invention
The application provides a method and a device for designing a current-limiting reactor of a ground fault full-compensation system, which aim to solve the problem that once a ground fault phase judgment error occurs in the prior art, a ground fault current compensation system can mistakenly input a non-fault phase, so that a ground fault point generates larger fault current. The fault current may exceed the current carrying capacity of the lines of the power grid system, and endanger the safety of the power grid system.
In a first aspect, the present invention provides a method for designing a current-limiting reactor of a ground fault full compensation system, including:
obtaining capacitance current I of power grid system c ；
According to the capacitance current I of the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor base ；
According to the rated thermal short-circuit current I base Calculating rated continuous current I of the current-limiting protection reactor E ；
According to the rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor L ；
According to the rated reactance value X of the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor L So that the rated reactance value contained in the earth fault current full compensation system is X L Rated capacity of S L When the power grid system has a ground fault and the ground fault current full compensation system judges the ground fault phase incorrectly, limiting the ground fault current in the ground fault phase to be below a preset threshold value, wherein the preset threshold value is the maximum current value which can be borne by the power grid system;
wherein the capacitance current I is determined according to the power grid system c The current limiting reactor is calculated according to the following formulaRated thermal short-circuit current I base ：
I base ＝kI c
And k is a current limiting coefficient, and the value range is 2-6.
Further, the current I is according to the rated thermal short circuit base Calculating rated continuous current I of the current-limiting protection reactor E The method comprises the following steps:
according to the rated thermal short-circuit current I base Calculating rated continuous current I of the current-limiting protection reactor by the following formula E ：
Wherein k is d The value range is 5-10 for capacity reduction coefficient.
Further, according to the rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor L The method comprises the following steps:
according to the rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor by the following formula L ：
Wherein the content of the first and second substances,
for rated line voltage, X, of the grid system T And the leakage reactance of the earth fault current full compensation system on one side of the neutral point of the power grid system is reduced.
Further, according to the rated reactance value X of the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor L The method comprises the following steps:
according to the rated reactance value X of the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor by the following formula L ：
S L ＝X L IE 2 。
Further, the earth fault current full compensation system comprises a line phase converter 1, a current-limiting protection reactor 2, a split-phase switch group 3, a regulating transformer 4 and a controller 5;
the line-phase converter 1 comprises a phase power supply generator 11 and a phase power supply phase compensator 12 which are connected with each other, wherein the phase power supply generator 11 is connected with each phase power line of three-phase power lines of the power grid system, the phase power supply phase compensator 12 is grounded, the phase power supply phase compensator 12 is connected with each of three split-phase switches included in the split-phase switch group 3, the regulating transformer 4 is connected with each of the three split-phase switches included in the split-phase switch group 3, the controller 5 is connected with the regulating transformer 4, and the controller 5 is connected with the split-phase switch group 3;
the first end of the current-limiting protection reactor 2 is connected with the regulating transformer 4, and the second end of the current-limiting protection reactor 2 is connected with a neutral point of the power grid system; or, the first end of the current-limiting protection reactor 2 is connected with the regulating transformer 4, the second end of the current-limiting protection reactor 2 is grounded, and the regulating transformer 4 is connected with the neutral point of the power grid system.
Further, under the condition that the first end of the current-limiting protection reactor 2 is connected with the regulating transformer 4, and the second end of the current-limiting protection reactor 2 is connected with the neutral point of the power grid system, the insulation level of the first end of the current-limiting protection reactor 2 and the insulation level of the second end of the current-limiting protection reactor 2 are consistent with the insulation level of the neutral point of the power grid system.
Further, under the condition that the first end of the current-limiting protection reactor 2 is connected with the voltage-regulating transformer 4 and the second end of the current-limiting protection reactor 2 is grounded, the insulation level range of the second end of the current-limiting protection reactor 2 is 3 kV-5 kV, and the insulation level of the first end of the current-limiting protection reactor 2 is consistent with the insulation level of the neutral point of the power grid system.
In a second aspect, the present invention further provides a device for designing a current-limiting reactor of a ground fault full compensation system, including:
an acquisition module for acquiring the capacitance current I of the power grid system c ；
A first calculation module for calculating the capacitance current I according to the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor base ；
A second calculation module for calculating the rated thermal short-circuit current I base Calculating rated continuous current I of the current-limiting protection reactor E ；
A third calculation module for calculating the rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor L ；
A fourth calculation module for calculating the rated reactance value X of the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor L So that the rated reactance value contained in the earth fault current full compensation system is X L Rated capacity of S L When the power grid system has a ground fault and the ground fault current full compensation system judges the ground fault phase incorrectly, limiting the ground fault current in the ground fault phase to be below a preset threshold value, wherein the preset threshold value is the maximum current value which can be borne by the power grid system;
wherein the capacitance current I is determined according to the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor according to the following formula base ：
I base ＝kI c
And k is a current limiting coefficient, and the value range is 2-6.
According to the technical scheme, the embodiment of the invention providesA method and a device for designing a current-limiting reactor of a ground fault full-compensation system are provided, and a capacitance current I of a power grid system is obtained c (ii) a According to the capacitance current I of the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor base (ii) a According to the rated thermal short-circuit current I base Calculating rated continuous current I of the current-limiting protection reactor E (ii) a According to the rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor L (ii) a According to the rated reactance value X of the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor L So that the rated reactance value contained in the earth fault current full compensation system is X L Rated capacity of S L When the power grid system has a ground fault and the ground fault current full compensation system judges the ground fault phase incorrectly, limiting the ground fault current in the ground fault phase to be below a preset threshold value, wherein the preset threshold value is the maximum current value which can be borne by the power grid system; wherein the capacitance current I is determined according to the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor according to the following formula base ：I base ＝kI c And k is a current limiting coefficient, and the value range is 2-6. Therefore, under the condition that the power grid system has the ground fault and the ground fault current full compensation system judges the ground fault phase wrongly, the ground fault current in the ground fault phase can be limited below a preset threshold value, and the safety of the power grid system is protected.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to 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 for designing a current-limiting reactor of a ground fault full compensation system according to the present invention;
FIG. 2 is a schematic diagram of a ground fault current full compensation system according to the present invention;
FIG. 3 is a second schematic diagram of a ground fault current full compensation system provided by the present invention;
FIG. 4 is a schematic diagram of the present invention providing a method of limiting ground fault current in a ground fault phase;
fig. 5 is a structural diagram of a current-limiting reactor design device of a ground fault full compensation system provided by the invention.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
Referring to fig. 1, fig. 1 is a flowchart of a method for designing a current-limiting reactor of a ground fault full compensation system according to the present invention. As shown in fig. 1, the method comprises the following steps:
In step 101, a capacitance current I of the grid system may be obtained c 。
102, according to the capacitance current I of the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor base 。
In step 102, the capacitance current I of the grid system may be determined c Calculating the rated thermal short-circuit current I of the current-limiting reactor base 。
103, according to the rated thermal short-circuit current I base Calculating rated continuous current I of the current-limiting protection reactor E 。
In step 103, the thermal short-circuit current I may be determined according to the rated thermal short-circuit current I base Calculating the rated continuous current I of the current-limiting protection reactor E 。
Optionally, said current is dependent on said rated thermal short-circuit current I base Calculating rated continuous current I of the current-limiting protection reactor E The method comprises the following steps:
according to the rated thermal short-circuit current I base Calculating rated continuous current I of the current-limiting protection reactor by the following formula E ：
Wherein k is d The value range is 5-10 for capacity reduction coefficient.
It should be noted that the rated continuous current I of the current-limiting protection reactor can be calculated by the following formula E ：
Wherein k is d The value range is 5-10 for capacity reduction coefficient.
104, according to the rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor L 。
In step 104, the thermal short circuit current I may be rated according to base Calculating the rated reactance value X of the current-limiting protection reactor L 。
Optionally, according to said rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor L The method comprises the following steps:
according to the rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor by the following formula L ：
Wherein the content of the first and second substances,
for rated line voltage, X, of said grid system T And the leakage reactance of the earth fault current full compensation system on one side of the neutral point of the power grid system is reduced.
It should be noted that the rated reactance value X of the current-limiting protection reactor can be calculated by the following formula L ：
Wherein the content of the first and second substances,
rated line voltage, X, for the grid system T And the leakage reactance of the earth fault current full compensation system on the neutral point side of the power grid system is reduced.
105, according to the rated reactance value X of the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor L So that the rated reactance value contained in the earth fault current full compensation system is X L Rated capacity of S L When the power grid system has a ground fault and the ground fault current full compensation system judges the ground fault phase incorrectly, limiting the ground fault current in the ground fault phase to be below a preset threshold value, wherein the preset threshold value is the maximum current value which can be borne by the power grid system; wherein the capacitance current I is determined according to the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor according to the following formula base ：I base ＝kI c And k is a current limiting coefficient, and the value range is 2-6.
In step 105, the reactance value X may be determined according to the rated reactance value of the current-limiting protection reactor L And rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor L So that the rated reactance included in the earth fault current full compensation systemValue of X L Rated capacity of S L When the power grid system has ground fault and the ground fault current full compensation system judges the ground fault phase wrongly, the current limiting reactor limits the ground fault current in the ground fault phase below a preset threshold value. The preset threshold value is the maximum current value which can be borne by the power grid system. Wherein, the capacitance current I can be determined according to the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor according to the following formula base ：
I base ＝kI c
And k is a current limiting coefficient and has a value range of 2-6.
It should be noted that, in the prior art, once a ground fault phase determination error occurs, the ground fault current compensation system may mistakenly switch into a non-fault phase, resulting in a larger fault current occurring at a ground fault point. The fault current may exceed the current carrying capacity of the lines of the grid system, compromising the safety of the grid system.
In the invention, when the power grid system has ground fault and the ground fault current full compensation system judges the ground fault phase wrongly, the ground fault current in the ground fault phase can be limited below a preset threshold value, so that the safety of the power grid system is protected.
Optionally, according to the rated reactance value X of the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor L The method comprises the following steps:
according to the rated reactance value X of the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor by the following formula L ：
S L ＝X L I E 2 。
It should be noted that the rated capacity S of the current-limiting protection reactor can be calculated by the following formula L ：
S L ＝X L I E 2 。
For example, setting the rated line voltage of a certain grid system
The voltage is 10kV, the capacitance current of a power grid system is 100A, the current limiting coefficient k is 4, and the rated thermal short-circuit current I of the current-limiting protection reactor is calculated base Is 400A;
taking a volume reduction coefficient k d To 5, calculating rated continuous current I of the current-limiting protection reactor E Is 80A;
leakage reactance X reduced to neutral point N side of power grid system by earth fault current full compensation system T The rated reactance value X of the current-limiting protection reactor can be calculated to be 14.4 ohms L 10.6 ohms;
finally, the rated capacity S of the current-limiting protection reactor can be calculated L It was 67.8 kVA.
Optionally, the ground fault current full compensation system includes a line-to-phase converter 1, a current-limiting protection reactor 2, a split-phase switch group 3, a regulating transformer 4 and a controller 5;
the line-phase converter 1 comprises a phase power supply generator 11 and a phase power supply phase compensator 12 which are connected with each other, wherein the phase power supply generator 11 is connected with each phase power line of three-phase power lines of the power grid system, the phase power supply phase compensator 12 is grounded, the phase power supply phase compensator 12 is connected with each of three split-phase switches included in the split-phase switch group 3, the regulating transformer 4 is connected with each of the three split-phase switches included in the split-phase switch group 3, the controller 5 is connected with the regulating transformer 4, and the controller 5 is connected with the split-phase switch group 3;
the first end of the current-limiting protection reactor 2 is connected with the regulating transformer 4, and the second end of the current-limiting protection reactor 2 is connected with a neutral point of the power grid system; or, the first end of the current-limiting protection reactor 2 is connected with the regulating transformer 4, the second end of the current-limiting protection reactor 2 is grounded, and the regulating transformer 4 is connected with the neutral point of the power grid system.
Fig. 2 is a schematic diagram of a ground fault current full compensation system according to the present invention;
fig. 3 is a second schematic diagram of the ground fault current full compensation system provided by the present invention.
The earth fault current full compensation system can comprise a line phase converter 1, a current limiting protection reactor 2, a split-phase switch group 3, a regulating transformer 4 and a controller 5. The line-phase converter 1 may include a phase power generator 11 and a phase power phase compensator 12 connected to each other. The phase supply power generator 11 may be connected to each of the three phase transmission lines of the grid system, the phase supply power phase compensator 12 is grounded, and the phase supply power phase compensator 12 may be connected to each of the three phase splitting switches included in the phase splitting switch group 3. A regulating transformer 4 may be connected to each of the three split-phase switches comprised by the split-phase switch bank 3, a controller 5 may be connected to the regulating transformer 4, and the controller 5 may be connected to the split-phase switch bank 3.
As shown in fig. 2, a first end of the current limiting protection reactor 2 may be connected with the regulating transformer 4, and a second end of the current limiting protection reactor 2 may be connected with a neutral point N of the grid system.
Alternatively, as shown in fig. 3, the first end of the current-limiting protection reactor 2 may be connected to the voltage-regulating transformer 4, the second end of the current-limiting protection reactor 2 may be grounded, and the voltage-regulating transformer 4 may be connected to the neutral point N of the power grid system.
The grid system may comprise an ac power source 6, a transformer 7, a coil 8 and a three-phase power line A, B, C.
Optionally, under the condition that the first end of the current-limiting protection reactor 2 is connected to the voltage regulating transformer 4, and the second end of the current-limiting protection reactor 2 is connected to the neutral point of the power grid system, the insulation level of the first end of the current-limiting protection reactor 2 and the insulation level of the second end of the current-limiting protection reactor 2 are consistent with the insulation level of the neutral point of the power grid system.
Further, in a case where the first end of the current limiting protection reactor 2 is connected to the voltage regulating transformer 4, and the second end of the current limiting protection reactor 2 is connected to the neutral point N of the grid system, the insulation level of the first end of the current limiting protection reactor 2 and the insulation level of the second end of the current limiting protection reactor 2 may be identical to the insulation level of the neutral point N of the grid system.
Optionally, under the condition that the first end of the current-limiting protection reactor 2 is connected to the voltage regulating transformer 4 and the second end of the current-limiting protection reactor 2 is grounded, the insulation level of the second end of the current-limiting protection reactor 2 ranges from 3kV to 5kV, and the insulation level of the first end of the current-limiting protection reactor 2 is consistent with the insulation level of the neutral point of the power grid system.
Further, under the condition that the first end of the current-limiting protection reactor 2 is connected with the voltage regulating transformer 4 and the second end of the current-limiting protection reactor 2 is grounded, the insulation level range of the second end of the current-limiting protection reactor 2 may be 3kV to 5kV, and the insulation level of the first end of the current-limiting protection reactor 2 may be consistent with the insulation level of the neutral point N of the power grid system.
Fig. 4 is a schematic diagram of limiting the ground fault current in the ground fault phase according to the present invention. As shown in fig. 4, the grid system may include at least two lines, i.e., a first line, a second line, an nth line, and so on. The zero sequence current of the first line is I 01 (ii) a Zero sequence current of the second line is I 02 (ii) a Zero sequence current of Nth line is I 0n . The zero sequence current of each line comprises three-phase current, namely A-phase current, B-phase current and C-phase current. Under the condition that the C phase of the Nth line of the at least two lines has single-phase earth fault, the current can be limited by the current-limiting protection reactor to avoid harming the safety of a power grid system.
Furthermore, each line protection device of the power grid system can be provided with zero-sequence current protection, and the zero-sequence current protection fixed value can be calculated according to the following formula:
I th ＝k th I c
wherein, I th Setting a protection constant value for the zero sequence current; k is a radical of th The value range is 1-2 for sensitivity coefficient; i is c Is the capacitance current of the power grid system.
When the earth fault current exceeds the zero sequence current protection constant value of the line protection device, the fault line can be tripped through the line protection device to realize fault isolation.
According to the technical scheme, the method for designing the ground fault current full compensation system provided by the embodiment of the invention obtains the capacitance current I of the power grid system c (ii) a According to the capacitance current I of the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor base (ii) a According to the rated thermal short-circuit current I base Calculating rated continuous current I of the current-limiting protection reactor E (ii) a According to the rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor L (ii) a According to the rated reactance value X of the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor L So that the rated reactance value contained in the earth fault current full compensation system is X L Rated capacity of S L When the power grid system has a ground fault and the ground fault current full compensation system judges the ground fault phase incorrectly, limiting the ground fault current in the ground fault phase to be below a preset threshold, wherein the preset threshold is the maximum current value which can be borne by the power grid system; wherein the capacitance current I is determined according to the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor according to the following formula base ：I base ＝kI c And k is a current limiting coefficient, and the value range is 2-6. Therefore, under the condition that the power grid system has the ground fault and the ground fault current full compensation system judges the ground fault phase wrongly, the ground fault current in the ground fault phase can be limited below a preset threshold value, and the safety of the power grid system is protected.
Referring to fig. 5, fig. 5 is a structural diagram of a current-limiting reactor design device of a ground fault full compensation system provided by the invention. As shown in fig. 5, the current limiting reactor design apparatus 500 of the ground fault full compensation system includes an obtaining module 501, a first calculating module 502, a second calculating module 503, a third calculating module 504, and a fourth calculating module 505, wherein:
an obtaining module 501, configured to obtain a capacitance current I of a power grid system c ；
A first calculation module 502, configured to calculate a capacitance current I according to the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor base ；
A second calculation module 503 for calculating the rated thermal short-circuit current I base Calculating rated continuous current I of the current-limiting protection reactor E ；
A third calculation module 504 for calculating a thermal short-circuit current I according to said rating base Calculating the rated reactance value X of the current-limiting protection reactor L ；
A fourth calculating module 505, configured to calculate a rated reactance value X according to the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor L So that the rated reactance value contained in the earth fault current full compensation system is X L Rated capacity of S L When the power grid system has a ground fault and the ground fault current full compensation system judges the ground fault phase incorrectly, limiting the ground fault current in the ground fault phase to be below a preset threshold, wherein the preset threshold is the maximum current value which can be borne by the power grid system;
wherein the capacitance current I is determined according to the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor according to the following formula base ：
I base ＝kI c
And k is a current limiting coefficient, and the value range is 2-6.
The current-limiting reactor design device 500 of the ground fault full compensation system can implement each process implemented by the current-limiting reactor design device of the ground fault full compensation system in the method embodiment of fig. 1, and is not described herein again to avoid repetition. And the current-limiting reactor design device 500 of the ground fault full compensation system can limit the ground fault current in the ground fault phase to be below a preset threshold value under the condition that the power grid system has a ground fault and the ground fault current full compensation system has a wrong judgment on the ground fault phase, so that the safety of the power grid system is protected.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (5)
1. A method for designing a current-limiting reactor of a ground fault full compensation system is characterized by comprising the following steps:
obtaining capacitance current I of power grid system c ；
According to the capacitance current I of the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor base ；
According to the rated thermal short-circuit current I base Calculating rated continuous current I of the current-limiting protection reactor by the following formula E ：
Wherein k is d The value range is 5-10 for the capacity reduction coefficient;
according to the rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor by the following formula L ：
Wherein the content of the first and second substances,
for rated line voltage, X, of said grid system T The leakage reactance of the earth fault current full compensation system is reduced to one side of a neutral point of the power grid system;
according to the rated reactance value X of the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor by the following formula L ：
S L ＝X L I E 2 ，
So that the rated reactance value contained in the earth fault current full compensation system is X L Rated capacity of S L When the power grid system has a ground fault and the ground fault current full compensation system judges the ground fault phase incorrectly, limiting the ground fault current in the ground fault phase to be below a preset threshold value, wherein the preset threshold value is the maximum current value which can be borne by the power grid system;
wherein the capacitance current I is determined according to the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor according to the following formula base ：
I base ＝kI c
And k is a current limiting coefficient, and the value range of k is 2-6.
2. The method according to claim 1, wherein the earth fault current full compensation system comprises a line phase converter 1, a current limiting protection reactor 2, a split-phase switch group 3, a regulating transformer 4 and a controller 5;
the line-phase converter 1 comprises a phase power supply generator 11 and a phase power supply phase compensator 12 which are connected with each other, wherein the phase power supply generator 11 is connected with each phase power line of three-phase power lines of the power grid system, the phase power supply phase compensator 12 is grounded, the phase power supply phase compensator 12 is connected with each of three split-phase switches included in the split-phase switch group 3, the regulating transformer 4 is connected with each of the three split-phase switches included in the split-phase switch group 3, the controller 5 is connected with the regulating transformer 4, and the controller 5 is connected with the split-phase switch group 3;
the first end of the current-limiting protection reactor 2 is connected with the regulating transformer 4, and the second end of the current-limiting protection reactor 2 is connected with a neutral point of the power grid system; or, the first end of the current-limiting protection reactor 2 is connected with the regulating transformer 4, the second end of the current-limiting protection reactor 2 is grounded, and the regulating transformer 4 is connected with the neutral point of the power grid system.
3. The method according to claim 2, characterized in that in the case where the first end of the current limiting protection reactor 2 is connected to the regulating transformer 4 and the second end of the current limiting protection reactor 2 is connected to the neutral point of the grid system, the insulation level of the first end of the current limiting protection reactor 2 and the insulation level of the second end of the current limiting protection reactor 2 coincide with the insulation level of the neutral point of the grid system.
4. The method according to claim 2, characterized in that in the case where the first end of the current limiting protection reactor 2 is connected to the regulating transformer 4 and the second end of the current limiting protection reactor 2 is grounded, the insulation level of the second end of the current limiting protection reactor 2 ranges from 3kV to 5kV, and the insulation level of the first end of the current limiting protection reactor 2 coincides with the insulation level of the neutral point of the grid system.
5. A current-limiting reactor design device of a ground fault full compensation system is characterized by comprising the following components:
an acquisition module for acquiring the capacitance current I of the power grid system c ；
A first calculation module for calculating the capacitance current I according to the power grid system c Calculating the current-limiting reactanceRated thermal short-circuit current I of device base ；
A second calculation module for calculating the rated thermal short-circuit current I base Calculating rated continuous current I of the current-limiting protection reactor by the following formula E ：
Wherein k is d The value range is 5-10 for the capacity reduction coefficient;
a third calculation module for calculating the rated thermal short-circuit current I base Calculating the rated reactance value X of the current-limiting protection reactor by the following formula L ：
Wherein the content of the first and second substances,
for rated line voltage, X, of the grid system T The leakage reactance of the earth fault current full compensation system is reduced to one side of a neutral point of the power grid system;
a fourth calculation module for calculating the rated reactance value X of the current-limiting protection reactor L And the rated continuous current I E Calculating the rated capacity S of the current-limiting protection reactor by the following formula L ：
S L ＝X L I E 2 ，
So that the rated reactance value contained in the earth fault current full compensation system is X L Rated capacity of S L The current-limiting reactor limits the earth fault current in the earth fault phase to be below a preset threshold value under the condition that the power grid system has earth fault and the earth fault current full compensation system has wrong judgment on the earth fault phaseThe maximum current value which can be borne by the net system;
wherein the capacitance current I is determined according to the power grid system c Calculating the rated thermal short-circuit current I of the current-limiting reactor according to the following formula base ：
I base ＝kI c
And k is a current limiting coefficient, and the value range is 2-6.
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