CN113452014A - Accurate and rapid suppression and voltage arc extinction full-compensation optimization control method for unbalanced zero-sequence voltage of power distribution network - Google Patents

Accurate and rapid suppression and voltage arc extinction full-compensation optimization control method for unbalanced zero-sequence voltage of power distribution network Download PDF

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CN113452014A
CN113452014A CN202110593247.9A CN202110593247A CN113452014A CN 113452014 A CN113452014 A CN 113452014A CN 202110593247 A CN202110593247 A CN 202110593247A CN 113452014 A CN113452014 A CN 113452014A
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刘宝稳
许洪华
马宏忠
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Hohai University HHU
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • H02J3/00125—Transmission line or load transient problems, e.g. overvoltage, resonance or self-excitation of inductive loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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Abstract

The invention discloses an unbalanced zero-sequence voltage accurate and rapid suppression and voltage arc extinction full-compensation optimization control method which is characterized in that the unbalanced zero-sequence voltage accurate suppression method only needs to adjust current injection once, and the defects of multiple injection and poor repeated tracking effect and long consumed time of the traditional method are overcome; the method for realizing voltage arc extinction full compensation is provided, the injection current for realizing full compensation can be calculated by only adjusting the injection current once before the fault, the influence of the unbalance of the power grid distribution parameters on the compensation effect is effectively eliminated, the fault phase voltage is thoroughly clamped to be 0, the arc starting condition is thoroughly eliminated, and the method is simple to operate and easy to implement.

Description

Accurate and rapid suppression and voltage arc extinction full-compensation optimization control method for unbalanced zero-sequence voltage of power distribution network
Technical Field
The invention relates to the field of power distribution network ground fault protection, in particular to a power distribution network unbalanced zero sequence voltage accurate and rapid suppression and voltage arc extinction full-compensation optimization control method.
Background
The medium-voltage distribution network in China mainly operates in a low-current grounding mode, fault current is relatively small after single-phase grounding fault, line voltage is symmetrical and power can be supplied continuously, and the medium-voltage distribution network has the advantage of high power supply reliability. With the enlargement of the scale of a power grid, particularly the massive application of urban cable lines, the capacitance current of a single-phase earth fault is increased, and the overlarge capacitance current is easy to cause electric arcs to generate arc overvoltage, so that the lines or equipment with weak system insulation are broken down or develop into irreversible faults such as interphase short circuit and the like, and the accident influence surface is enlarged. The grounding current full compensation and reliable arc extinction technology is still a hotspot and difficult problem of research.
Because distribution parameters of a power distribution network are unbalanced commonly, zero-sequence unbalanced zero-sequence voltage exists when a power grid operates normally, the traditional unbalanced zero-sequence voltage suppression method adopts ideas of trial and error and gradual optimization, a current needs to be injected initially, then the phase and amplitude of the injected current are adjusted continuously, and the optimal value is determined according to the feedback quantity of the zero-sequence voltage. The method is complex to operate, theoretically, multiple cycles of current injection, voltage measurement, current injection and current measurement are needed, the operation is complex, and the optimization result can only be infinitely close to the target value. In addition, when a single-phase ground fault occurs in a power grid, the traditional voltage arc extinction method does not take the asymmetric influence of the power grid into account, so that the fault phase voltage cannot be completely suppressed to 0, and the arc extinction of 100% voltage cannot be realized.
Disclosure of Invention
The invention aims to provide a power distribution network unbalanced zero sequence voltage accurate and rapid inhibition and voltage arc extinction full compensation optimization control method, which is used for realizing rapid inhibition and voltage arc extinction full compensation of the power distribution network unbalanced zero sequence voltage, reliably inhibiting the power network zero sequence voltage to 0 when a power network is in a non-single-phase ground fault, and reliably inhibiting the fault phase voltage to 0 after the single-phase ground fault so as to realize 100% arc extinction.
In order to achieve the purpose, the invention provides the following technical scheme: a method for accurately and rapidly inhibiting unbalanced zero sequence voltage of a power distribution network comprises the following steps:
step 1: injecting fundamental current into neutral point of power grid
Figure BDA0003090317580000011
Collecting the current injection current
Figure BDA0003090317580000012
Zero sequence voltage of power grid
Figure BDA0003090317580000013
Step 2: adjusting the injection current to be the injection fundamental current
Figure BDA0003090317580000014
Collecting the current injection current
Figure BDA0003090317580000015
Zero sequence voltage of power grid
Figure BDA0003090317580000016
And step 3: calculating the injection current value for restraining the unbalanced zero sequence voltage of the power grid to be 0
Figure BDA0003090317580000021
Figure BDA0003090317580000022
And 4, step 4: injecting fundamental current into the grid through a current generator
Figure BDA0003090317580000023
Suppressing zero-sequence unbalanced zero-sequence voltage of a power grid to 0;
and 5: and (4) judging whether the power grid has line switching operation or not, and if so, returning to the step 1.
Further, the injection of a fundamental current
Figure BDA0003090317580000024
And
Figure BDA0003090317580000025
the amplitudes of the two phases are all |0.15(j ω C + G) |, the phase difference is 180 degrees, wherein C is the system earth distributed capacitance, G is the system earth distributed conductance, and ω is the angular frequency of the system.
The invention also provides a voltage arc extinction full-compensation optimization control method, which comprises the following steps:
step a: monitoring the injection of fundamental current at the neutral point of the grid
Figure BDA0003090317580000026
The zero sequence voltage of the power grid is increased to epsilon% of the phase voltage, the power grid is judged to have single-phase earth fault, and the zero sequence voltage after the offset is recorded as
Figure BDA0003090317580000027
Entering into step b, the
Figure BDA0003090317580000028
The calculation method of (2) is as follows:
Figure BDA0003090317580000029
wherein, fundamental current is injected into neutral point of power grid
Figure BDA00030903175800000210
Collecting the current injection current
Figure BDA00030903175800000211
Zero sequence voltage of power grid
Figure BDA00030903175800000212
Adjusting the injection current to be the injection fundamental current
Figure BDA00030903175800000213
Collecting the current injection current
Figure BDA00030903175800000214
Zero sequence voltage of power grid
Figure BDA00030903175800000215
Step b: injecting voltage arc-extinguishing fully-compensated injection current to neutral point of power grid through current generator
Figure BDA00030903175800000216
Comprises the following steps:
Figure BDA00030903175800000217
in the formula (2), the reaction mixture is,
Figure BDA00030903175800000218
is a phase A power supply potential, inject
Figure BDA00030903175800000219
Reliably restraining the A phase voltage to be 0; if the fault phase is B phase, the fault phase represented by the formula (2)
Figure BDA00030903175800000220
Conversion to mains B-phase supply potential
Figure BDA00030903175800000221
If the fault phase is C phase, the fault phase represented by the formula (2)
Figure BDA00030903175800000222
Conversion to grid C-phase supply potential
Figure BDA00030903175800000223
Step c: adjusting the injection current to
Figure BDA00030903175800000224
And (c) observing whether the zero sequence voltage is to be 0 or not, if so, judging that the fault is a transient fault, extinguishing the electric arc, returning to the step a, and if not, returning to the step b.
Further, the failure determination threshold value ∈% is set to 3% of the phase voltage in step a.
Further, the injection of a fundamental current
Figure BDA00030903175800000225
And
Figure BDA00030903175800000226
the amplitudes of the two phases are all |0.15(j ω C + G) |, and the phase difference is 180 degrees, wherein C is the system ground distributed capacitance, and G is the system ground distributed conductance.
Has the advantages that: compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
according to the accurate and rapid suppression and voltage arc extinction full-compensation optimization control method for the unbalanced zero-sequence voltage of the power distribution network, the accurate suppression method for the unbalanced zero-sequence voltage only needs to adjust the current injected once, and the defects that multiple times of injection and poor repeated tracking effect are caused and the consumed time is long are overcome; the method for realizing voltage arc extinction full compensation is provided, the injection current for realizing full compensation can be calculated by only adjusting the injection current once before the fault, the influence of the unbalance of the power grid distribution parameters on the compensation effect is effectively eliminated, the fault phase voltage is thoroughly clamped to be 0, the arc starting condition is thoroughly eliminated, and the method is simple to operate and easy to implement.
Drawings
FIG. 1 is a flow chart of a method for controlling accurate and rapid suppression of unbalanced zero sequence voltage and full compensation of voltage arc extinction and optimization in a power distribution network;
fig. 2 is a simulated calculation value of the grounding residual current of the voltage arc extinction full compensation method.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a flow chart of a method for accurately and rapidly suppressing unbalanced zero sequence voltage and optimally controlling voltage arc extinction and full compensation of a power distribution network.
The invention provides a method for accurately and quickly inhibiting unbalanced zero sequence voltage of a power distribution network, which comprises the following steps of:
step 1: injecting fundamental current into neutral point of power grid
Figure BDA0003090317580000031
Collecting the current injection current
Figure BDA0003090317580000032
Zero sequence voltage of power grid
Figure BDA0003090317580000033
Step 2: adjusting the injection current to be the injection fundamental current
Figure BDA0003090317580000034
Collecting the current injection current
Figure BDA0003090317580000035
Zero sequence voltage of power grid
Figure BDA0003090317580000036
And step 3: calculating the injection current value for restraining the unbalanced zero sequence voltage of the power grid to be 0
Figure BDA0003090317580000037
Figure BDA0003090317580000038
And 4, step 4: injecting fundamental current into the grid through a current generator
Figure BDA0003090317580000039
Suppressing zero-sequence unbalanced zero-sequence voltage of a power grid to 0;
and 5: and (4) judging whether the power grid has line switching operation or not, and if so, returning to the step 1.
Further, it is characterized byThe injected fundamental current
Figure BDA00030903175800000310
And
Figure BDA00030903175800000311
the amplitudes of the two phases are all |0.15(j ω C + G) |, the phase difference is 180 degrees, wherein C is the system earth distributed capacitance, G is the system earth distributed conductance, and ω is the angular frequency of the system.
The invention also provides a voltage arc extinction full-compensation optimization control method, which comprises the following steps:
step a: monitoring the injection of fundamental current at the neutral point of the grid
Figure BDA0003090317580000041
The zero sequence voltage of the power grid is increased to epsilon% of the phase voltage, the power grid is judged to have single-phase earth fault, and the zero sequence voltage after the offset is recorded as
Figure BDA0003090317580000042
Entering into step b, the
Figure BDA0003090317580000043
The calculation method of (2) is as follows:
Figure BDA0003090317580000044
wherein, fundamental current is injected into neutral point of power grid
Figure BDA0003090317580000045
Collecting the current injection current
Figure BDA0003090317580000046
Zero sequence voltage of power grid
Figure BDA0003090317580000047
Adjusting the injection current to be the injection fundamental current
Figure BDA0003090317580000048
Collecting the current injection current
Figure BDA0003090317580000049
Zero sequence voltage of power grid
Figure BDA00030903175800000410
Step b: injecting voltage arc-extinguishing fully-compensated injection current to neutral point of power grid through current generator
Figure BDA00030903175800000411
Comprises the following steps:
Figure BDA00030903175800000412
in the formula (2), the reaction mixture is,
Figure BDA00030903175800000413
is a phase A power supply potential, inject
Figure BDA00030903175800000414
Reliably restraining the A phase voltage to be 0; if the fault phase is B phase, the fault phase represented by the formula (2)
Figure BDA00030903175800000415
Conversion to mains B-phase supply potential
Figure BDA00030903175800000416
If the fault phase is C phase, the fault phase represented by the formula (2)
Figure BDA00030903175800000417
Conversion to grid C-phase supply potential
Figure BDA00030903175800000418
Step c: adjusting the injection current to
Figure BDA00030903175800000419
And (c) observing whether the zero sequence voltage is to be 0 or not, if so, judging that the fault is a transient fault, extinguishing the electric arc, returning to the step a, and if not, returning to the step b.
Further, the failure determination threshold value ∈% is set to 3% of the phase voltage in step a.
Further, the injection of a fundamental current
Figure BDA00030903175800000420
And
Figure BDA00030903175800000421
the amplitudes of the two phases are all |0.15(j ω C + G) |, and the phase difference is 180 degrees, wherein C is the system ground distributed capacitance, and G is the system ground distributed conductance.
MATLAB/simulink simulation is utilized to verify the effectiveness of the accurate suppression and voltage arc extinction full compensation method for the unbalanced zero sequence voltage. The simulation system is a 10kV power distribution network, the capacitance current of the simulation system is 72.770A, the active current of the simulation system is 1.316A, the asymmetry degree of the system is 1.750%, and the damping rate is 1.809%.
Considering the universality of the method under various grounding modes, the simulation system sets two modes of ungrounded mode and resonant grounding mode, wherein the arc suppression coil operates at 15% of overcompensation (the inductance value of the arc suppression coil is 0.219604H). Firstly, injecting current with the amplitude of 10A and the phase angle of 0 degree into a neutral point, then adjusting the phase angle of the injected current to 90 degrees, collecting the zero sequence voltage of a power grid, and calculating the injected current for restraining the zero sequence voltage to 0 according to the formula (1)
Figure BDA00030903175800000422
Then calculating the current
Figure BDA00030903175800000423
And injecting the voltage into a system, and observing the suppression effect of the zero sequence voltage.
TABLE 1 neutral point ungrounded injection current
Figure BDA0003090317580000054
Calculating simulation results
Figure BDA0003090317580000051
TABLE 2 over-compensated ground injection current for arc suppression coil
Figure BDA0003090317580000055
Calculating simulation results
Figure BDA0003090317580000052
Measured in tables 1 and 2 respectively
Figure BDA0003090317580000053
Injecting the voltage into a power grid, measuring the suppressed zero sequence voltage to be 0.00135-107.634 degrees V and 0.00421-71.640 degrees V respectively, and basically suppressing the zero sequence unbalanced zero sequence voltage to be 0.
Setting single-phase earth faults on the phase A of the simulation system, setting the value range of the transition resistance to 10000-0.1, calculating voltage arc extinction full compensation according to the formula (2) to obtain the injection current of 72.43021-92.00230 degrees A, and obtaining the amplitude of the residual fault current, wherein the measurement result is shown in figure 2. As can be seen from fig. 2, the residual current amplitude when the fault resistance is 0.1 Ω is only 0.001162 a.

Claims (5)

1. A method for accurately and rapidly inhibiting unbalanced zero sequence voltage of a power distribution network is characterized by comprising the following steps:
step 1: injecting fundamental current into neutral point of power grid
Figure FDA0003090317570000011
Collecting the current injection current
Figure FDA0003090317570000012
Zero sequence voltage of power grid
Figure FDA0003090317570000013
Step 2: adjusting the injection current to be the injection fundamental current
Figure FDA0003090317570000014
Collecting the current injection current
Figure FDA0003090317570000015
Zero sequence voltage of power grid
Figure FDA0003090317570000016
And step 3: calculating the injection current value for restraining the unbalanced zero sequence voltage of the power grid to be 0
Figure FDA0003090317570000017
Figure FDA0003090317570000018
And 4, step 4: injecting fundamental current into the grid through a current generator
Figure FDA0003090317570000019
Suppressing zero-sequence unbalanced zero-sequence voltage of a power grid to 0;
and 5: and (4) judging whether the power grid has line switching operation or not, and if so, returning to the step 1.
2. The method for accurately and rapidly suppressing the unbalanced zero sequence voltage of the power distribution network according to claim 1, wherein the injected fundamental current is injected
Figure FDA00030903175700000110
And
Figure FDA00030903175700000111
all of the amplitudes of (c) are |0.15j ω C + G) |, the phase difference is 180 degrees, wherein C is the system ground distributed capacitance, G is the system ground distributed conductance, and ω is the angular frequency of the system.
3. A voltage arc extinction full-compensation optimization control method is characterized by comprising the following steps:
step a: monitoring the injection of fundamental current at the neutral point of the grid
Figure FDA00030903175700000112
The zero sequence voltage of the power grid is increased to epsilon% of the phase voltage, the power grid is judged to have single-phase earth fault, and the zero sequence voltage after the offset is recorded as
Figure FDA00030903175700000113
Entering into step b, the
Figure FDA00030903175700000114
The calculation method of (2) is as follows:
Figure FDA00030903175700000115
wherein, fundamental current is injected into neutral point of power grid
Figure FDA00030903175700000116
Collecting the current injection current
Figure FDA00030903175700000117
Zero sequence voltage of power grid
Figure FDA00030903175700000118
Adjusting the injection current to be the injection fundamental current
Figure FDA00030903175700000119
Collecting the current injection current
Figure FDA00030903175700000120
Zero sequence voltage of power grid
Figure FDA00030903175700000121
Step b: injecting voltage arc-extinguishing fully-compensated injection current to neutral point of power grid through current generator
Figure FDA00030903175700000122
Comprises the following steps:
Figure FDA00030903175700000123
in the formula (2), the reaction mixture is,
Figure FDA00030903175700000124
is a phase A power supply potential, inject
Figure FDA00030903175700000125
Reliably restraining the A phase voltage to be 0; if the fault phase is B phase, the fault phase represented by the formula (2)
Figure FDA00030903175700000126
Conversion to mains B-phase supply potential
Figure FDA00030903175700000127
If the fault phase is C phase, the fault phase represented by the formula (2)
Figure FDA00030903175700000128
Conversion to grid C-phase supply potential
Figure FDA00030903175700000129
Step c: adjusting the injection current to
Figure FDA00030903175700000130
And (c) observing whether the zero sequence voltage is to be 0 or not, if so, judging that the fault is a transient fault, extinguishing the electric arc, returning to the step a, and if not, returning to the step b.
4. A voltage arc extinction full compensation optimization control method according to claim 3, wherein the failure determination threshold value e% in the step a is set to 3% of the phase voltage.
5. A voltage arc extinction full compensation optimization control method according to claim 3, wherein the injected fundamental current
Figure FDA0003090317570000021
And
Figure FDA0003090317570000022
the amplitudes of the two phases are all |0.15(j ω C + G) |, and the phase difference is 180 degrees, wherein C is the system ground distributed capacitance, and G is the system ground distributed conductance.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114421824A (en) * 2022-01-19 2022-04-29 安徽大学 Brushless direct current motor position sensorless control method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110943443A (en) * 2019-11-25 2020-03-31 杭州电力设备制造有限公司 Power distribution network arc extinction method based on capacitance compensation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110943443A (en) * 2019-11-25 2020-03-31 杭州电力设备制造有限公司 Power distribution network arc extinction method based on capacitance compensation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114421824A (en) * 2022-01-19 2022-04-29 安徽大学 Brushless direct current motor position sensorless control method

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