CN115528661A - Zero sequence voltage starting and setting method for distribution network arc suppression coil grounding system - Google Patents
Zero sequence voltage starting and setting method for distribution network arc suppression coil grounding system Download PDFInfo
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Abstract
The invention relates to the technical field of power systems, and discloses a zero sequence voltage starting and setting method of a distribution network arc suppression coil grounding system, which comprises the following steps: a) Acquiring a maximum unbalanced voltage value of a neutral point of a grounding system, and determining a starting minimum value of a fault zero sequence voltage; b) Determining a zero sequence voltage of a first system, and calculating a starting maximum value of a fault zero sequence voltage; c) Judging whether the starting maximum value is greater than or equal to the starting minimum value; d) And determining the starting range of the fault zero sequence voltage to be greater than or equal to the starting minimum value and less than or equal to the starting maximum value. The minimum starting value is determined by the maximum unbalanced voltage of the system, so that the system can not be started mistakenly when running normally; and then, the starting maximum value is calculated through the zero sequence voltage of the first system, so that the starting of the arc suppression coil under the condition of system safety can be ensured. The method has strong pertinence, ensures that the system cannot be started by mistake when running normally, and has certain guarantee for the safe running of the system.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a zero sequence voltage starting setting method for a distribution network arc suppression coil grounding system.
Background
In the existing power distribution network system, the neutral point can generate inductive current to compensate grounding capacitance current in a mode of grounding through an arc suppression coil, so that the amplitude of the grounding current is reduced, and the reignition of electric arcs is avoided. The method is characterized in that when a line has a single-phase earth fault, the power distribution network can still normally and continuously operate for 2 hours according to a set rule without being influenced by the fault, and the method is widely popularized and applied in China.
When a single-phase earth fault occurs in the power distribution network system, the fault zero sequence voltage and the fault current change, the fault current of the earth point consists of two parts, one part is attenuated according to an exponential law, and the other part oscillates in a constant amplitude manner according to a sine wave law. The starting compensation of the arc suppression coil can reduce the earth fault current of the system, and avoid the threat to the safe operation of the system caused by the overlarge earth fault current. At present, the starting voltage threshold value of an arc suppression coil does not have a good setting flow, and the zero sequence voltage starting threshold value range is not determined by combining the characteristics of a power distribution network system, so that the system is easy to be unstable, and the safe operation of the system is influenced.
Disclosure of Invention
The purpose of the invention is: the zero sequence voltage starting setting method for the distribution network arc suppression coil grounding system can be matched with a distribution network system to determine a more reasonable zero sequence voltage starting threshold value range, so that arc suppression coil starting compensation is more stable.
In order to achieve the purpose, the invention provides a zero sequence voltage starting setting method of a distribution network arc suppression coil grounding system, which comprises the following steps:
a) Acquiring a maximum unbalanced voltage value of a neutral point of a grounding system, and determining a starting minimum value of fault zero-sequence voltage;
b) Determining a first system zero sequence voltage, and calculating a starting maximum value of the fault zero sequence voltage;
c) Judging whether the starting maximum value of the fault zero-sequence voltage is larger than or equal to the starting minimum value of the fault zero-sequence voltage,
if not, returning to the step B),
if yes, executing step D);
d) And determining the starting range of the fault zero-sequence voltage to be greater than or equal to the starting minimum value of the fault zero-sequence voltage and less than or equal to the starting maximum value of the fault zero-sequence voltage.
Preferably, the step a) further comprises: obtaining a maximum unbalance voltage value of 15V of a neutral point of a grounding system, wherein the starting minimum value of the fault zero sequence voltage is U Small ：
U Small ＝K×15V
In the formula, K is the safety coefficient of the system.
As a preferred scheme, determining the zero sequence voltage of the first system in the step B) specifically comprises: obtaining a transition resistance value, a system capacitance current and an overcompensation degree, and calculating the zero sequence voltage 3U of the first system 0 The calculation formula is as follows:
wherein: I.C. A f ＝I C +I L ＝νI C ；
In the formula, E A For fault phase supply voltage, R g To transition resistance value, I f For compensated fault point residual flow, I L Current of arc suppression coil, I C And v is the over-compensation degree of the arc suppression coil.
As a preferred scheme, calculating a starting maximum value of the fault zero-sequence voltage in the step B), specifically:
calculating the starting maximum value U of the fault zero sequence voltage Big (a) The calculation formula is as follows:
in the formula, 3U 0 The zero sequence voltage of the first system, and K is the safety coefficient of the system.
Preferably, in the step a) and the step B), the method further includes the step N) of determining whether the grounding system is a pre-tuned arc suppression coil grounding system;
if yes, executing the step B),
if not, executing the step M),
m) determining a second system zero sequence voltage and calculating a starting maximum value of the fault zero sequence voltage;
step C) is performed,
if not, returning to the step M),
if yes, executing step D).
As a preferred scheme, determining the zero sequence voltage of the second system in the step M) specifically includes:
obtaining a transition resistance value and a system capacitance current, and calculating the zero sequence voltage 3U of the second system 0 ', its calculation formula is as follows:
in the formula, E A For fault phase supply voltage, R g To transition resistance value, I C V' is a preset constant for the system capacitance current.
As a preferred scheme, the maximum starting value of the fault zero-sequence voltage is calculated in the step M), and specifically:
calculating the starting maximum value U of the fault zero sequence voltage Big (a) The calculation formula is as follows:
in the formula, 3U 0 ' is the zero sequence voltage of the second system, and K is the safety factor of the system.
Preferably, the system capacitance current I C The range of (A) is 20 to 200A.
Preferably, the safety factor K is 1.2.
Compared with the prior art, the zero sequence voltage starting and setting method of the distribution network arc suppression coil grounding system has the beneficial effects that:
when the arc suppression coil is applied to a power distribution network system, the maximum unbalanced voltage of the system is fully considered, the minimum starting value of the fault zero-sequence voltage is determined by utilizing the maximum unbalanced voltage of the system, and the system can be ensured not to be started mistakenly in normal operation; and then calculating the starting maximum value of the fault zero sequence voltage through the first system zero sequence voltage, so that the starting of the arc suppression coil under the condition of system safety can be ensured. Then comparing the starting minimum value and the starting maximum value of the fault zero-sequence voltage, and determining the starting range of the fault zero-sequence voltage when the starting maximum value is greater than or equal to the starting minimum value; and if the starting maximum value cannot be guaranteed to be larger than or equal to the starting minimum value, readjusting system parameters and re-determining the starting maximum value of the fault zero-sequence voltage. The fault zero sequence voltage starting and setting method can be matched with a power distribution network system, is strong in pertinence, ensures that the system cannot be started mistakenly when running normally, and has certain guarantee for safe running of the system.
Drawings
Fig. 1 is a flow chart of a zero sequence voltage starting setting method of a distribution network arc suppression coil grounding system according to an embodiment of the present invention;
fig. 2 is a flow chart of the zero sequence voltage starting setting method for the distribution network arc suppression coil grounding system according to the embodiment of the invention, which can distinguish the pre-tuned arc suppression coil grounding system from the tuning following arc suppression coil grounding system;
fig. 3 is a single-phase grounding zero-sequence voltage distribution diagram of a pre-tuned arc suppression coil grounding system of the zero-sequence voltage starting setting method of the distribution network arc suppression coil grounding system according to the embodiment of the invention;
fig. 4 is a single-phase grounding zero-sequence voltage distribution diagram of a tuning-following arc suppression coil grounding system of the zero-sequence voltage starting and setting method of the distribution network arc suppression coil grounding system according to the embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms used in the present invention are used in the description of the present invention, and it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like used in the present invention are used in the orientations and positional relationships shown in the drawings, which are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are used only to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a zero sequence voltage starting setting method for a distribution network arc suppression coil grounding system according to a preferred embodiment of the present invention includes the following steps:
a) Acquiring a maximum unbalanced voltage value of a neutral point of a grounding system, and determining a starting minimum value of fault zero-sequence voltage;
b) Determining a first system zero sequence voltage, and calculating a starting maximum value of the fault zero sequence voltage;
c) Judging whether the starting maximum value of the fault zero-sequence voltage is greater than or equal to the starting minimum value of the fault zero-sequence voltage;
if not, returning to the step B),
if yes, executing step D),
d) And determining the starting range of the fault zero-sequence voltage to be greater than or equal to the starting minimum value of the fault zero-sequence voltage and less than or equal to the starting maximum value of the fault zero-sequence voltage.
Based on the technical scheme, when the arc suppression coil is applied to the power distribution network system, the maximum unbalanced voltage of the system is fully considered, the minimum starting value of the fault zero-sequence voltage is determined by utilizing the maximum unbalanced voltage of the system, and the fault zero-sequence voltage cannot be started mistakenly when the system operates normally; and then, the starting maximum value of the fault zero-sequence voltage is calculated through the zero-sequence voltage of the first system, so that the starting of the arc suppression coil under the condition of system safety can be ensured. Then comparing the starting minimum value and the starting maximum value of the fault zero-sequence voltage, and determining the starting range of the fault zero-sequence voltage when the starting maximum value is greater than or equal to the starting minimum value; if the starting maximum value cannot be guaranteed to be larger than or equal to the starting minimum value, the partial system parameters need to be adjusted again, and the starting maximum value of the fault zero sequence voltage needs to be determined again. The fault zero sequence voltage starting and setting method can be matched with a power distribution network system, is strong in pertinence, ensures that the system cannot be started mistakenly when running normally, and has certain guarantee for safe running of the system.
In this embodiment, in step a), the method further includes: obtaining a maximum unbalance voltage value of 15V of a neutral point of a grounding system, wherein the starting minimum value of the fault zero sequence voltage is U Small ：
U Small ＝K×15V
In the formula, K is the safety factor of the system.
In order to avoid the system from being started mistakenly during normal operation, according to the requirements of DL/T620-1997 on overvoltage protection and insulation coordination of the alternating current electric device, under the condition of normal operation, the automatic tracking compensation arc suppression device ensures that the long-time voltage displacement of a neutral point does not exceed 15 percent of the nominal phase voltage of the system, namely the maximum unbalanced voltage of the system does not exceed 866V, and the corresponding secondary value of the zero-sequence voltage is 15V. Therefore, the zero sequence voltage starting threshold value of the line selection device is at least larger than 15V, namely the maximum unbalanced voltage of the neutral point of the low-current grounding system is avoided, and the misoperation is avoided during normal operation. And then considering the system safety coefficient, and taking the product of the maximum unbalanced voltage of the system and the system safety coefficient as the starting minimum value of the fault zero-sequence voltage.
In this embodiment, the operating mode of the arc suppression coil is divided into a pre-tuning mode and a tuning-along mode, and for the pre-tuning type arc suppression coil grounding system, the compensation effect of the arc suppression coil enables the starting sensitivity of the power distribution network to be effectively improved, so the pre-tuning type arc suppression coil grounding system is preferentially adopted.
In this embodiment, the determining the zero sequence voltage of the first system in the step B) specifically includes: obtaining a transition resistance value, a system capacitance current and an overcompensation degree, and calculating the zero sequence voltage 3U of the first system 0 The calculation formula is as follows:
wherein: I.C. A f ＝I C +I L ＝νI C ；
In the formula, E A For fault phase supply voltage, R g To transition resistance value, I f For compensated fault point residual flow, I L Current of arc suppression coil, I C The arc suppression coil is a system capacitance current, v is the over-compensation degree of the arc suppression coil, and is generally-10% -5%.
It can be seen from fig. 3 that when the zero sequence voltage starting threshold value of the pre-tuned arc suppression coil grounding system is 30V and the system capacitance current is 200A, the transition resistance capability is about 900 Ω. The zero sequence voltage of the pre-tuned arc suppression coil grounding system is related to the residual current of the fault point after compensation in the metallic grounding and the transition resistance value (starting sensitivity), the better the compensation effect of the arc suppression coil is, and the smaller the residual current of the fault point in the metallic grounding is, the larger the zero sequence voltage value is. Therefore, the reasonable setting and the daily maintenance of the inductance value of the arc suppression coil play a decisive role in the starting sensitivity.
Further, calculating the fault zero sequence voltage in the step B)The maximum starting value of (a) is specifically: calculating the starting maximum value U of the fault zero sequence voltage Big (a) The calculation formula is as follows:
in the formula, 3U 0 The zero sequence voltage of the first system, and K is the safety coefficient of the system.
After the zero sequence voltage of the first system is determined, the starting maximum value of the fault zero sequence voltage needs to be calculated, and the safe operation of the system is guaranteed.
Finally, determining the fault zero sequence voltage U act The value range is as follows: u shape Small ≤U act ≤U Big (a) 。
For pre-tuned arc suppression coil grounding systems, the relevant regulations stipulate that the arc suppression coil is compensated I f Should be less than 10A, but on site I f Phenomena greater than 10A are common, so take I f ＝20A(I C 200A, overcompensation degree of-10%), R g Calculating the starting threshold value of zero sequence voltage of 0-1000 omega and K of 1.2, and obtaining U with the value of 18V being less than or equal to U through calculation act ≤23V。
As another equivalent embodiment, as shown in fig. 2, the system may also adopt a tuned arc suppression coil grounding system, and then in step a) and step B), a step N) is further included to determine whether the grounding system is a pre-tuned arc suppression coil grounding system;
if yes, executing the step B),
if not, executing the step M),
m) determining a second system zero sequence voltage and calculating a starting maximum value of the fault zero sequence voltage;
step C) is performed,
if not, returning to the step M),
if yes, executing step D).
Because the following tuning type arc suppression coil grounding system is different from the pre-tuning type arc suppression coil grounding system, the following tuning type arc suppression coil is far away from the resonance state when working normally, and can be regarded as an ungrounded system, the following tuning type arc suppression coil is only put into operation to compensate after the fault zero sequence voltage exceeds the starting threshold value, and the following tuning type arc suppression coil is automatically compensated according to the fault current, so that the total compensation or the small overcompensation degree can be generally achieved. Therefore, the overcompensation degree v is not required to be determined under the normal working state of the tuning type arc suppression coil grounding system.
In this embodiment, the determining the zero sequence voltage of the second system in the step M) specifically includes:
obtaining a transition resistance value and a system capacitance current, and calculating the zero sequence voltage 3U of the second system 0 ', its calculation formula is as follows:
in the formula, E A For fault phase supply voltage, R g To transition resistance value, I C V' is a preset constant for the system capacitance current.
As can be seen from fig. 4, when the zero-sequence voltage starting threshold of the system grounded with the tuned arc suppression coil is 30V and the system capacitance current is 148A, the transient resistance (starting sensitivity) is only about 120 Ω. In a period before the occurrence of the ground fault, the ground system of the tuning type arc suppression coil can be regarded as an ungrounded system, the compensation effect of the arc suppression coil is not generated, and the obvious reduction of the starting sensitivity can be obviously seen.
Further, calculating a starting maximum value of the fault zero-sequence voltage in the step M), specifically:
calculating the starting maximum value U of the fault zero sequence voltage Big (a) The calculation formula is as follows:
in the formula, 3U 0 ' is the zero sequence voltage of the second system, and K is the safety factor of the system.
After the zero sequence voltage of the second system is determined, the starting maximum value of the fault zero sequence voltage needs to be calculated, and the safe operation of the system is guaranteed.
Finally, as with a pre-tuned arc suppression coil grounding system, determining the starting range of the fault zero-sequence voltage only when the starting maximum value is greater than or equal to the starting minimum value; if the starting maximum value cannot be guaranteed to be larger than or equal to the starting minimum value, the partial system parameters need to be adjusted again, and the starting maximum value of the fault zero sequence voltage needs to be determined again.
Aiming at the tuning-following arc suppression coil grounding system, the capacitance current of the system needs to be less than 38A according to the requirement that the transition resistance capability of the low-current grounding fault line selection device of the southern power grid is 1000 omega. When I is C When the voltage is larger than 38A, the tuning type arc suppression coil grounding system cannot realize the starting of the transition resistance of 1000 omega by reducing the zero sequence voltage starting threshold value, and I C At 150A, the transient resistance capability is only 253 Ω, which is much smaller than the specified value of the southern power grid, so that the zero sequence voltage starting threshold range can be determined only when the system capacitor current is small and the transient resistance capability may reach 1000 Ω.
In this embodiment, when the system capacitance current is greater than 20A, the arc suppression coil should be used for compensation, and the system capacitance current is generally about 150A and does not exceed 200A, so the system capacitance current I is used C The range of (2) is set to 20A to 200A. The safety factor K is set to 1.2 by comprehensively considering the influence of various factors of the system, so that the starting minimum value K × 15v =18v of the fault zero-sequence voltage.
In conclusion, the zero sequence voltage starting setting method for the distribution network arc suppression coil grounding system provided by the invention has the following advantages: (1) Determining a starting minimum value of the fault zero sequence voltage according to the maximum unbalanced voltage of the system, calculating a starting maximum value of the fault zero sequence voltage according to the first system zero sequence voltage, and determining a starting range of the fault zero sequence voltage only when the starting maximum value is greater than or equal to the starting minimum value, so that the system is ensured not to be started mistakenly when running normally, and the system also has certain guarantee on safe operation; (2) Fully considering the safety coefficient of the system, and setting the starting range of the fault zero-sequence voltage under the condition of determining the safety coefficient of the system; (3) The starting ranges of the corresponding fault zero sequence voltages are respectively determined according to the working modes of the pre-tuning arc suppression coil grounding system and the tuning-following arc suppression coil grounding system, the pertinence is strong, and the application range is wider.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. A zero sequence voltage starting and setting method for a distribution network arc suppression coil grounding system is characterized by comprising the following steps:
a) Acquiring a maximum unbalanced voltage value of a neutral point of a grounding system, and determining a starting minimum value of a fault zero sequence voltage;
b) Determining a first system zero sequence voltage, and calculating a starting maximum value of the fault zero sequence voltage;
c) Judging whether the starting maximum value of the fault zero-sequence voltage is larger than or equal to the starting minimum value of the fault zero-sequence voltage,
if not, returning to the step B),
if yes, executing step D);
d) And determining the starting range of the fault zero-sequence voltage to be greater than or equal to the starting minimum value of the fault zero-sequence voltage and less than or equal to the starting maximum value of the fault zero-sequence voltage.
2. The method for starting and setting the zero sequence voltage of the distribution network arc suppression coil grounding system according to claim 1, wherein in the step A), the method further comprises the following steps: obtaining a maximum unbalance voltage value of 15V of a neutral point of a grounding system, wherein the starting minimum value of the fault zero sequence voltage is U Small ：
U Small ＝K×15V
In the formula, K is the safety factor of the system.
3. As claimed inSolving 2 the zero sequence voltage starting setting method of the distribution network arc suppression coil grounding system is characterized in that the zero sequence voltage of the first system is determined in the step B), and the method specifically comprises the following steps: obtaining a transition resistance value, a system capacitance current and an overcompensation degree, and calculating the zero sequence voltage 3U of the first system 0 The calculation formula is as follows:
wherein: I.C. A f ＝I C +I L ＝νI C ；
In the formula, E A For fault phase supply voltage, R g To transition resistance value, I f For compensated fault point residual flow, I L Current of arc suppression coil, I C The value is system capacitance current, and v is arc suppression coil overcompensation degree.
4. The zero sequence voltage starting and setting method of the distribution network arc suppression coil grounding system according to claim 3, wherein the maximum starting value of the fault zero sequence voltage is calculated in the step B), specifically:
calculating the starting maximum value U of the fault zero sequence voltage Big (a) The calculation formula is as follows:
in the formula, 3U 0 The zero sequence voltage of the first system, and K is the safety coefficient of the system.
5. The method for starting and setting the zero sequence voltage of the distribution network arc suppression coil grounding system according to claim 1, characterized in that in the step A) and the step B), the method further comprises the step N) of judging whether the grounding system is a pre-tuned arc suppression coil grounding system;
if yes, executing the step B),
if not, executing the step M),
m) determining a second system zero sequence voltage and calculating a starting maximum value of the fault zero sequence voltage;
step C) is performed,
if not, returning to the step M),
if yes, executing step D).
6. The zero-sequence voltage startup setting method for the distribution network arc suppression coil grounding system according to claim 5, characterized in that the determination of the second system zero-sequence voltage in the step M) is specifically:
obtaining a transition resistance value and a system capacitance current, and calculating the zero sequence voltage 3U of the second system 0 ', its calculation formula is as follows:
in the formula, E A For fault phase supply voltage, R g To transition resistance value, I C V' is a preset constant for the system capacitance current.
7. The zero sequence voltage starting and setting method of the distribution network arc suppression coil grounding system according to claim 6, wherein the maximum starting value of the fault zero sequence voltage is calculated in the step M), and specifically:
calculating the starting maximum value U of the fault zero sequence voltage Big (a) The calculation formula is as follows:
in the formula, 3U 0 ' is the zero sequence voltage of the second system, and K is the safety factor of the system.
8. The zero sequence voltage starting and setting method for the distribution network arc suppression coil grounding system according to claim 3 or 6, characterized in that the system powerCapacity current I C The range of (A) is 20 to 200A.
9. The zero-sequence voltage starting setting method for the distribution network arc suppression coil grounding system according to claim 4 or 7, characterized in that the safety factor K is 1.2.
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| CN117973097A (en) * | 2024-04-02 | 2024-05-03 | 国网四川省电力公司电力科学研究院 | Method for acquiring resistance interval corresponding to starting fixed value under arc suppression coil grounding system |
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| CN117973097A (en) * | 2024-04-02 | 2024-05-03 | 国网四川省电力公司电力科学研究院 | Method for acquiring resistance interval corresponding to starting fixed value under arc suppression coil grounding system |
| CN117973097B (en) * | 2024-04-02 | 2024-06-11 | 国网四川省电力公司电力科学研究院 | Method for acquiring resistance interval corresponding to starting fixed value under arc suppression coil grounding system |
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