CN104218563A - Power distribution network fault arc extinction method by connecting neutral point to the ground through multi-level converter - Google Patents
Power distribution network fault arc extinction method by connecting neutral point to the ground through multi-level converter Download PDFInfo
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Abstract
The invention relates to a power distribution network fault arc extinction method by connecting a neutral point to the ground through multi-level converter. The power distribution network fault arc extinction method is characterized in that the cascade H-bridge multi-level converter is adopted and directly connected at the position of the neutral point of a power distribution network through a reactor; at the initial moment when the power distribution network has a single-phase earth fault, synthetic operation is conducted to generate offset currents needed to be injected (img file='69356dest_path_image001. TIF'wi'19' he'=25' /), then the offset currents are quickly put into the multi-level converter, the multi-level converter is controlled by aid of the current tracking control algorithm and the PWM (Pulse-Width Modulation) modulation strategy to generate offset currents (img file='652784dest_path_image001. TIF'wi'19' he'=25' /), and the offset currents are put into the neutral point of the power distribution network so as to compensate grounding total currents of the fault point. In addition, the fault phase voltage is forced to be 0 constantly so the instantaneous grounding fault can be cleared automatically, and further the technical problem of the existing fault arc extinction technology of poor arc extinction effect can be solved.
Description
Technical field
The present invention relates to a kind of distribution network ground fault arc extinction technical field.
Background technology
Power distribution network broad covered area, go deep into user terminal, complex structure, operational mode is changeable, random fault is frequent, wherein approximately 70% distribution network failure is instantaneity earth fault.Along with continuous extension and the expansion of power distribution network, fault point earth current increases, instantaneity earth fault extinguishing arc ability, ground arc will be difficult to from horizontal blanking, easily form unsettled discontinuous combustion phenomenon, consequent intermittent arcing ground over-voltage amplitude is higher, and 2.5 ~ 3.5 times of can reach phase voltage are even higher, long action time, damaging effect is large, can cause multiple faults under certain condition, causes large-area power-cuts, jeopardize power grid security, affect social stability.
For restriction earth fault current, China's power distribution network generally adopts neutral non-effective grounding mode, and now earth current is less.It is generally acknowledged, when earth current is less than 5A, most of arc energy is extinguished naturally, and earth current is more close to 0, more favourable to arc extinction.
Current common all kinds of extinguishing arc technology, comprise arc extinguishing method that automatic turn-adjusting arc-extinguishing winding, air gap adjustable arc-extinction winding, D.C. magnetic biasing formula arc suppression coil, three-phase five-column arc-suppression coil, adjustable capacitive-based arc-suppression coil, high short-circuit impedance formula transformer type arc suppression coil, arc extinction cabinet and arc suppression coil and earth fault transfer device are used in conjunction with etc., all belong to passive extinguishing arc technology.Passive extinguishing arc technology can only be put idle residual flow by compensate for failed, can not compensate active current and harmonic current, and extinguishing arc effect is limited.
Subsequently, on the basis of passive extinguishing arc, engendered active extinguishing arc technology, as the residual flow compensation arrangement of Sweden, master-slave mode secondary side are adjusted sense zero residual flow arc suppression coil, flexible earth fault extinguishing arc technology, can be adapted to the active extinguishing arc technology of line construction dynamic change etc.The residual flow compensation arrangement of Sweden is by Injection Current, to control after fault the admittance of power distribution network zero sequence to equal zero sequence admittance before fault, and it has utilized the zero sequence admittance before fault, can not reflect in real time the change of distribution net work structure.Master-slave mode secondary side adjusts sense zero residual flow arc suppression coil when generation systems generation single phase ground fault, first start failure line selection program and select faulty line, then utilize the zero-sequence current of faulty line, system direct-to-ground capacitance under normal condition, faulty line capacitance size etc. is carried out the estimation of fault total current, harmonic component in earth current and real component are compensated, realize zero residual flow, and at present for resonant earthed system, its route selection technology is not too perfect, also there is wrong choosing, leak the situations such as choosing, if ground path choosing is wrong, follow-up work is all to move on towards wrong direction.Flexible earth fault extinguishing arc technology is a kind of residual voltage Flexible Control and false voltage arc extinguishing method based on STATCOM, the method adopts the arc suppression coil of static stall and the active inverter of two/tri-level to be used in conjunction with, to power distribution network, inject zero-sequence current, realize extinguishing arc, but distribution net work earthing fault electric current is complicated, may cause the switching tube frequency of two/tri-level active inverters high, loss is large.Can adapt to the active extinguishing arc technology of line construction dynamic change when single phase ground fault generation being detected, to power distribution network, inject any two primary currents respectively, and measure bus place residual voltage, utilize twice Injection Current and residual voltage to calculate earth resistance, when the calculated value of earth resistance is less than the border of the earth resistance of adjusting, adopt electric current extinguishing arc algorithm, otherwise,, adopt voltage extinguishing arc algorithm; This technology will first be calculated the size of earth resistance, then selects to adopt electric current extinguishing arc algorithm or voltage extinguishing arc algorithm, controls comparatively complicated.
Summary of the invention
The object of this invention is to provide a kind of neutral point through the distribution network failure arc extinguishing method of many level current transformers ground connection, solve the technical barrier of existing fault extinguishing arc technology extinguishing arc weak effect.
For achieving the above object, technical scheme of the present invention is: a kind of neutral point, through the distribution network failure arc extinguishing method of many level current transformers ground connection, comprises the following steps:
Step S01: adopt many level current transformers, be directly connected to the neutral point place of power distribution network by reactor;
Step S02: the offset current injecting to power network neutral point by analysis is in the distribution situation of whole distribution network, known no matter power distribution network generation metallic earthing fault or grounding through resistance fault, real component in injecting compensating electric current and idle component value are all identical, irrelevant with fault earthing resistance;
Step S03: when detecting the situation of power distribution network in normal operation, every certain time interval, adopt the checking for grounded current principle based on Injection Signal to calculate power distribution network equivalence direct-to-ground capacitance
with power distribution network leak resistance over the ground
, and preserve;
Step S04: when power distribution network generation single phase ground fault being detected, failure judgement phase, measure the residual voltage of neutral point, adopt fast Fourier algorithm to obtain the each harmonic voltage in residual voltage, obtain the harmonic component of earth fault current, and the described power distribution network equivalence direct-to-ground capacitance of preserving according to system before fault
with power distribution network leak resistance over the ground
, comprehensive computing generates the offset current of required injection
;
Step S05: the offset current generating with comprehensive computing
for instruction current, drop into many level current transformers, adopt current tracking control algolithm and PWM modulation strategy to control many level current transformers and produce offset current
and inject power network neutral point, and with compensate for failed point ground connection total current, and to force fault phase voltage perseverance be 0, instantaneity earth fault will be eliminated voluntarily;
Step S06: after certain time-delay, whether failure judgement disappears, if fault disappears, is judged as transient fault, and distribution network restoration normally moves; Otherwise, be judged as permanent fault, start line selection apparatus and carry out earth fault line selection protection.
In embodiments of the present invention, described many level current transformers are the many level current transformers of Cascade H bridge type.
In embodiments of the present invention, in described step S02, the fundametal compoment expression formula in offset current is
, wherein
for fault phase electromotive force of source,
,
,
,
,
,
be respectively power distribution network A, B, C tri-equivalent direct-to-ground capacitance,
,
,
be respectively relatively leak resistance of power distribution network A, B, C tri-.
In embodiments of the present invention, the checking for grounded current principle based on Injection Signal in described step S03 is: every certain time interval, utilize many level current transformers to neutral point place, to inject zero-sequence current
, measure neutral point voltage simultaneously
; Changing the zero-sequence current injecting is
, again measure zero sequence voltage on neutral point and obtain
, by
,
with
,
calculate power distribution network equivalence direct-to-ground capacitance
with power distribution network leak resistance over the ground
, its expression formula is as follows,
。
In embodiments of the present invention, in described step S04, when power distribution network generation single phase ground fault, adopt fast Fourier algorithm to obtain residual voltage
in each harmonic voltage as follows:
Wherein,
for the phasor of the nth harmonic voltage of neutral point voltage, the harmonic component in earth fault current is all from the harmonic current of electrical network, harmonic current
expression formula is:
，
According to the power distribution network equivalence direct-to-ground capacitance of preserving and power distribution network leak resistance value over the ground, comprehensive computing generates required injecting compensating electric current again
expression formula is:
,
for fault phase electromotive force of source.
In embodiments of the present invention, in described step S05, adopt current tracking control algolithm and PWM modulation strategy to control many level current transformers and produce and injecting compensating electric current
basic functional principle be: when power distribution network generation single phase ground fault, corresponding neutral point of electric network there will be a zero sequence voltage on neutral point
, this voltage
controllable voltage with many level current transformers two ends
on the reactor connecting, there is following mathematical relationship in acting in conjunction:
, the inductance that L is described reactor,
Current tracking control algolithm adopts PI control algolithm, its can control with
out of phase, different amplitudes
, PWM modulation adopts carrier phase modulation strategy to produce the pwm signal of controlling each power device, and final realization produces the zero sequence compensation electric current needing arbitrarily.
In embodiments of the present invention, in described step S06, the method whether failure judgement disappears is, reduce gradually Injection Current to 0, the situation that detects the variation of Zero Sequence Voltage Versus Injection Current and change, if the variation of residual voltage and Injection Current be varied to direct ratio, show fault point extinguishing arc, be judged as transient fault; Otherwise, be judged as permanent fault.
Compared to prior art, the present invention has following beneficial effect:
1, the present invention adopts the circuit topological structure of the many level current transformers of Cascade H bridge type, topological structure than two/tri-level active inverters, without output transformer, power capacity is large, devices switch frequency is low, loss is little, be easy to modularization, when level number is higher, the harmonic content of output waveform is lower.
2, the offset current injecting to power network neutral point by analysis is in the distribution situation of whole distribution network, known no matter power distribution network generation metallic earthing fault or grounding through resistance fault, the real component in injecting compensating electric current and idle component value and ground fault resistance are irrelevant.
3, at fault extinguishing arc technical elements, the checking for grounded current principle based on Injection Signal that the present invention proposes is combined the circuital method of calculating ground fault with fast fourier algorithm, can not only measure capacitor current for earthing, can also carry out Measurement accuracy to the real component of fault current and harmonic component, and to force fault phase voltage perseverance be 0, have without regulate arc suppression coil, principle clear, be easy to the advantages such as realization, applied range.
Accompanying drawing explanation
Fig. 1 is that neutral point is through the distribution network failure arc extinguishing method schematic diagram (C of take single phase ground fault occurs mutually as example) of many level current transformers ground connection.
Fig. 2 is that neutral point is through the fault extinguishing arc overall control block diagram of many level current transformers ground connection.
Fig. 3 is flow chart of the present invention.
Fig. 4 is the current waveform figure of neutral point fault point before and after the power distribution network generation single phase ground fault of many level current transformers ground connection.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is specifically described.
A kind of neutral point of the present invention, through the distribution network failure arc extinguishing method of many level current transformers ground connection, comprises the following steps:
Step S01: adopt many level current transformers, be directly connected to the neutral point place of power distribution network by reactor;
Step S02: the offset current injecting to power network neutral point by analysis is in the distribution situation of whole distribution network, known no matter power distribution network generation metallic earthing fault or grounding through resistance fault, real component in injecting compensating electric current and idle component value are all identical, irrelevant with fault earthing resistance;
Step S03: when detecting the situation of power distribution network in normal operation, every certain time interval, adopt the checking for grounded current principle based on Injection Signal to calculate power distribution network equivalence direct-to-ground capacitance
with power distribution network leak resistance over the ground
, and preserve;
Step S04: when power distribution network generation single phase ground fault being detected, failure judgement phase, measure the residual voltage of neutral point, adopt fast Fourier algorithm to obtain the each harmonic voltage in residual voltage, obtain the harmonic component of earth fault current, and the described power distribution network equivalence direct-to-ground capacitance of preserving according to system before fault
with power distribution network leak resistance over the ground
, comprehensive computing generates the offset current of required injection
;
Step S05: the offset current generating with comprehensive computing
for instruction current, drop into many level current transformers, adopt current tracking control algolithm and PWM modulation strategy to control many level current transformers and produce offset current
and inject power network neutral point, and with compensate for failed point ground connection total current, and to force fault phase voltage perseverance be 0, instantaneity earth fault will be eliminated voluntarily;
Step S06: after certain time-delay, whether failure judgement disappears, if fault disappears, is judged as transient fault, and distribution network restoration normally moves; Otherwise, be judged as permanent fault, start line selection apparatus and carry out earth fault line selection protection.
In the specific embodiment of the invention, described many level current transformers are the many level current transformers of Cascade H bridge type, and power distribution network described in step S03 equivalence direct-to-ground capacitance and power distribution network over the ground leak resistance carry out numerical value while preserving, and system adopts storehouse first in first out.
Fig. 1 be neutral point of the present invention through the distribution network failure arc extinguishing method schematic diagram of many level current transformers ground connection,
,
,
be respectively power distribution network three-phase mains voltage,
for neutral point displacement voltage,
,
,
be respectively relatively leak resistance of power distribution network A, B, C tri-,
,
,
be respectively three equivalent direct-to-ground capacitance,
for earth fault transition resistance, K is single-phase high voltage switch.
When K switch disconnects, power network neutral point is earth-free, when metallicity single phase ground fault occurs C mutually (
), C phase-to-ground voltage vanishing, and the rising of the voltage to earth of other two-phases is
doubly, that is:
Residual voltage is so:
Suppose
,
, the zero-sequence current that flows to fault point in healthy phases is:
The earth fault current flowing back to from earth point is so:
Wherein,
with
for power distribution network equivalence direct-to-ground capacitance and power distribution network leak resistance over the ground,
,
.Now, if Injection Current value is the electric current with earth fault current equal and opposite in direction, opposite direction:
Closed when K switch so, drop into many level current transformers to neutral point injecting compensating electric current, because metallic earthing is equivalent to fault phase by short circuit, offset current will all flow to fault point, ground connection total current that therefore can compensate for failed point, it is zero making residual flow.
When K switch disconnects, power network neutral point is earth-free, when grounding through resistance fault occurs C mutually (
), neutral point voltage be subjected to displacement into
, the electric current of each phase voltage and each phase flow direction fault point is:
Known according to KCL law, earth fault current is:
Now, Closing Switch K, drops into many level current transformers to neutral point injecting compensating electric current
, offset current is some fault point of flowing through only, the distribution situation of lower surface analysis offset current in whole network.
Due to the injection of offset current, neutral point voltage will change and cause the zero-sequence current of each phase all to change.If neutral point voltage change amount is
:
The zero-sequence current change amount of each phase flow direction fault point is:
The earth fault current change amount of fault point is:
Known according to KCL law, the distribution situation of offset current in whole network is:
If the earth fault current after order compensation
be 0, so:
Will
substitution offset current
in expression formula, arrange:
Due to
, therefore
:
Herein,
for the offset current of not considering to obtain in harmonic wave situation, therefore
reality is the fundametal compoment of offset current.The gaining merit of meritorious, the idle component of contrast metallicity fault earthing injecting compensating electric current and grounding through resistance fault injecting compensating electric current, idle component are known, real component in system injecting compensating electric current is identical with idle component value, irrelevant with fault earthing resistance.
Fundametal compoment by offset current
expression formula know, the fundametal compoment of offset current
need according to fault phase electromotive force of source, power distribution network equivalence direct-to-ground capacitance and power distribution network over the ground leak resistance calculate.When power distribution network generation single-phase fault, by failure judgement, try to achieve mutually fault phase electromotive force of source; When power distribution network normally moves, adopt checking for grounded current principle based on Injection Signal to try to achieve power distribution network equivalence direct-to-ground capacitance and power distribution network leak resistance over the ground.
Checking for grounded current principle based on Injection Signal is specific as follows:
Under system normal operation, every certain time interval (as 2s), Closing Switch K, utilizes the many level current transformers of Cascade H bridge type to neutral point place, to inject zero-sequence current
, the residual voltage of now measuring neutral point obtains
, relation is between the two as follows with equation expression:
Changing the zero-sequence current injecting is
, now the residual voltage of neutral point will change, through measuring
,
with
between relationship as follows:
Above-mentioned two formulas are subtracted each other and arrange:
Wherein,
,
for known quantity,
,
can measure and learn, therefore by above formula, obtain the equivalent direct-to-ground capacitance of power distribution network
with power distribution network leak resistance over the ground
for:
By what detect
with
preserve, in power distribution network generation single phase ground fault situation, can computing generate the earth fault current fundametal compoment compensating.
When harmonic component in fault earthing electric current is larger, should consider harmonic component to compensate.Because system is to adopt neutral point through the mode of many level current transformers ground connection, do not have arc suppression coil, so the harmonic component of system is all from electrical network.When power distribution network generation single phase ground fault, adopt fast Fourier algorithm to obtain residual voltage
in each harmonic voltage as follows:
Wherein,
phasor for the nth harmonic voltage of neutral point voltage.Harmonic component in earth fault current is all from the harmonic current of electrical network, harmonic current
Expression formula is:
Comprehensive computing generates required injecting compensating electric current
expression formula is:
,
In the harmonic component of earth current, 5 subharmonic content are maximum, and therefore main 5 order harmonic components that detect compensate, and make harmonic component be limited in certain limit, have both guaranteed the accuracy of the offset current of calculating, reduce again operand.
The offset current generating with comprehensive computing
as instruction current, then drop into rapidly many level current transformers, adopt PI control algolithm and carrier phase modulation strategy to control many level current transformers and produce and injecting compensating electric current
.The basic principle of this course of work is: when power distribution network generation single phase ground fault, corresponding neutral point of electric network there will be a zero sequence voltage on neutral point
, this voltage
controllable voltage with many level current transformers two ends
on the reactor connecting, there is following mathematical relationship in acting in conjunction:
, the inductance that L is described reactor,
PI control algolithm can control with
out of phase, different amplitudes
, the transfer function of pi regulator
for:
Wherein,
for proportionality coefficient;
for integral coefficient.Adopt carrier phase modulation strategy to produce the pwm signal of controlling each power device again, realize and produce required offset current, the basic thought of its modulation strategy is:
in individual many level current transformers with Cascade H Qiao Wei unit, (cycle is to use common modulating wave
), the phase place of the triangular carrier of each Cascade H bridge unit is staggered mutually
(
for carrier wave ratio), utilize waveform generating mode and the waveform overlaying structure in multiple technology in SPWM technology to produce phase shift SPWM waveform.
Drop into many level current transformers and carry out after extinguishing arc, through certain hour time delay (as 10s), carry out earth fault judgement, if fault point is extinguishing arc, fault extinguishing arc, changes the offset current injecting so, residual voltage also can proportionally change, and the mathematic(al) representation of the two is:
,
for the changing value of residual voltage,
So, reduce the offset current injecting extremely zero, if the proportional variation of residual voltage shows fault point extinguishing arc, be judged as transient fault; Otherwise, be judged as permanent fault, carry out earth fault line selection protection.
Fig. 2 be neutral point through the fault extinguishing arc overall control block diagram of many level current transformers ground connection, the circuit topology of many level current transformers represents with the current transformer of a Ge Xu Kuang Heyige unit.The control block diagram of overall system comprises three parts: current tracking control technology, PWM modulation strategy and voltage balance control.System control to adopt PI control algolithm at current tracking, makes the offset current that many level current transformers produce can the real-time variation that must follow the tracks of its instruction current; PWM modulation strategy adopts carrier phase modulation strategy, and it is a kind of switch modulation strategy that is applicable to high-power converter, and it produces the pwm signal of controlling each power device, and final realization produces the zero sequence compensation electric current needing; Because the first DC bus capacitor of receipts or other documents in duplicates at different levels is separate, the impact of the differences such as its component parameters, inverter bridge loss, pulse delay, capital causes the imbalance of DC capacitor voltage, therefore need in master-plan, increase a voltage balance control, control mode adopts PI to control, and comprises balance control and mean control.
Fig. 3 is flow chart of the present invention.First Real-Time Monitoring power distribution network three-phase voltage and residual voltage; When residual voltage is greater than 10% phase voltage, judgement earth fault occurs, and relatively three-phase voltage is big or small, and judgement voltage is minimum is fault phase mutually.When power distribution network generation single phase ground fault, utilize the many level current transformers of Cascade H bridge type to power distribution network Injection Current, compensate for failed point ground connection total current, and to force fault phase voltage perseverance be 0; After certain time-delay (as 10s), reduce Injection Current to zero, if neutral point voltage is proportional, reduce, extinguishing arc of fault point is described, distribution network restoration normally moves; Otherwise be judged as permanent earth fault, start wire selecting protection device.
In order to verify that neutral point described in the invention is through the feasibility of the power distribution network arc extinguishing method of many level current transformers ground connection, adopt PSCAD/EMTDC and MATLAB software to carry out simulation analysis to the power distribution network shown in Fig. 1.Table 1 is the parameter setting of distribution network line parameter and the many level current transformers of Cascade H bridge type.
Table 1
For different faults resistance, power distribution network the simulation results is as shown in table 2.Occur after single phase ground fault, the zero sequence compensation electric current injecting by control, can limit earth fault current and level off to 0, reliable extinguish arcs.
Table 2
Fig. 4 be at neutral point in the power distribution network of many level current transformers ground connection, when t=0.1s, system generation single phase ground fault (ground fault resistance is 100 Ω), in order relatively to inject the earth fault current size of zero sequence compensation electric current front and back, emulation herein is specially postponed and is dropped into the many level current transformers of Cascade H bridge type, at t=0.2s constantly, and the zero-sequence current of injecting compensating, after this can be observed fault residual current and significantly reduce even close to 0, compensation effect is better.
The foregoing is only specific embodiments of the invention, be not limited to the present invention, within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. neutral point, through a distribution network failure arc extinguishing method for many level current transformers ground connection, is characterized in that: comprise the following steps:
Step S01: adopt many level current transformers, be directly connected to the neutral point place of power distribution network by reactor;
Step S02: the offset current injecting to power network neutral point by analysis is in the distribution situation of whole distribution network, known no matter power distribution network generation metallic earthing fault or grounding through resistance fault, real component in injecting compensating electric current and idle component value are all identical, irrelevant with fault earthing resistance;
Step S03: when detecting the situation of power distribution network in normal operation, every certain time interval, adopt the checking for grounded current principle based on Injection Signal to calculate power distribution network equivalence direct-to-ground capacitance
with power distribution network leak resistance over the ground
, and preserve;
Step S04: when power distribution network generation single phase ground fault being detected, failure judgement phase, measure the residual voltage of neutral point, adopt fast Fourier algorithm to obtain the each harmonic voltage in residual voltage, obtain the harmonic component of earth fault current, and the described power distribution network equivalence direct-to-ground capacitance of preserving according to system before fault
with power distribution network leak resistance over the ground
, comprehensive computing generates the offset current of required injection
;
Step S05: the offset current generating with comprehensive computing
for instruction current, drop into many level current transformers, adopt current tracking control algolithm and PWM modulation strategy to control many level current transformers and produce offset current
and inject power network neutral point, and with compensate for failed point ground connection total current, and to force fault phase voltage perseverance be 0, instantaneity earth fault will be eliminated voluntarily;
Step S06: after certain time-delay, whether failure judgement disappears, if fault disappears, is judged as transient fault, and distribution network restoration normally moves; Otherwise, be judged as permanent fault, start line selection apparatus and carry out earth fault line selection protection.
2. a kind of neutral point according to claim 1, through the distribution network failure arc extinguishing method of many level current transformers ground connection, is characterized in that: described many level current transformers are the many level current transformers of Cascade H bridge type.
3. a kind of neutral point according to claim 1, through the distribution network failure arc extinguishing method of many level current transformers ground connection, is characterized in that: in described step S02, the fundametal compoment expression formula in offset current is
, wherein
for fault phase electromotive force of source,
,
,
,
,
,
be respectively power distribution network A, B, C tri-equivalent direct-to-ground capacitance,
,
,
be respectively relatively leak resistance of power distribution network A, B, C tri-.
4. a kind of neutral point according to claim 1 is through the distribution network failure arc extinguishing method of many level current transformers ground connection, it is characterized in that: the checking for grounded current principle based on Injection Signal in described step S03 is: every certain time interval, utilize many level current transformers to neutral point place, to inject zero-sequence current
, measure neutral point voltage simultaneously
; Changing the zero-sequence current injecting is
, again measure zero sequence voltage on neutral point and obtain
, by
,
with
,
calculate power distribution network equivalence direct-to-ground capacitance
with power distribution network leak resistance over the ground
, its expression formula is as follows,
。
5. a kind of neutral point according to claim 1, through the distribution network failure arc extinguishing method of many level current transformers ground connection, is characterized in that: in described step S04, when power distribution network generation single phase ground fault, adopt fast Fourier algorithm to obtain residual voltage
in each harmonic voltage as follows:
Wherein,
for the phasor of the nth harmonic voltage of neutral point voltage, the harmonic component in earth fault current is all from the harmonic current of electrical network, harmonic current
expression formula is:
，
According to the power distribution network equivalence direct-to-ground capacitance of preserving and power distribution network leak resistance value over the ground, comprehensive computing generates required injecting compensating electric current again
expression formula is:
,
for fault phase electromotive force of source.
6. a kind of neutral point according to claim 1 is through the distribution network failure arc extinguishing method of many level current transformers ground connection, it is characterized in that: in described step S05, adopt current tracking control algolithm and PWM modulation strategy to control many level current transformers and produce and injecting compensating electric current
basic functional principle be: when power distribution network generation single phase ground fault, corresponding neutral point of electric network there will be a zero sequence voltage on neutral point
, this voltage
controllable voltage with many level current transformers two ends
on the reactor connecting, there is following mathematical relationship in acting in conjunction:
, the inductance that L is described reactor,
Current tracking control algolithm adopts PI control algolithm, its can control with
out of phase, different amplitudes
, PWM modulation adopts carrier phase modulation strategy to produce the pwm signal of controlling each power device, and final realization produces the zero sequence compensation electric current needing arbitrarily.
7. a kind of neutral point according to claim 1 is through the distribution network failure arc extinguishing method of many level current transformers ground connection, it is characterized in that: in described step S06, the method whether failure judgement disappears is, reduce gradually Injection Current to 0, the situation that detects the variation of Zero Sequence Voltage Versus Injection Current and change, if the variation of residual voltage and Injection Current be varied to direct ratio, show fault point extinguishing arc, be judged as transient fault; Otherwise, be judged as permanent fault.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130069605A1 (en) * | 2009-06-29 | 2013-03-21 | Ideal Power Converters, Inc. | Power Transfer Devices, Methods, and Systems with Crowbar Switch Shunting Energy-Transfer Reactance |
| CN203261029U (en) * | 2013-04-17 | 2013-10-30 | 河北旭辉电气股份有限公司 | Power grid grounding compensation device based on arc suppression transformer |
| CN103441501A (en) * | 2013-08-30 | 2013-12-11 | 株洲变流技术国家工程研究中心有限公司 | Method for achieving arc suppression coil function by using high-voltage cascading type SVG |
-
2014
- 2014-09-26 CN CN201410500176.3A patent/CN104218563B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130069605A1 (en) * | 2009-06-29 | 2013-03-21 | Ideal Power Converters, Inc. | Power Transfer Devices, Methods, and Systems with Crowbar Switch Shunting Energy-Transfer Reactance |
| CN203261029U (en) * | 2013-04-17 | 2013-10-30 | 河北旭辉电气股份有限公司 | Power grid grounding compensation device based on arc suppression transformer |
| CN103441501A (en) * | 2013-08-30 | 2013-12-11 | 株洲变流技术国家工程研究中心有限公司 | Method for achieving arc suppression coil function by using high-voltage cascading type SVG |
Non-Patent Citations (3)
| Title |
|---|
| 曾祥君等: "基于配电网柔性接地控制的故障消弧与馈线保护新原理", 《中国电机工程学报》 * |
| 程路等: "基于DSP和PWM逆变器的新型自动调谐消弧系统设计", 《电力自动化设备》 * |
| 苑娇阳: "基于PWM变流器的消弧接地补偿装置的研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
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