CN107086584A - A kind of silent oscillation reacance generator and method that function is detected with fault electric arc - Google Patents
A kind of silent oscillation reacance generator and method that function is detected with fault electric arc Download PDFInfo
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- CN107086584A CN107086584A CN201710407951.4A CN201710407951A CN107086584A CN 107086584 A CN107086584 A CN 107086584A CN 201710407951 A CN201710407951 A CN 201710407951A CN 107086584 A CN107086584 A CN 107086584A
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- 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
- Y02E40/30—Reactive power compensation
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Abstract
The present invention provides a kind of silent oscillation reacance generator and method that function is detected with fault electric arc, and described silent oscillation reacance generator includes voltage sensor, current sensor, sample circuit, signal processing circuit, main control MCU, arc fault warning circuit, switching value spacing output circuit, IGBT drive circuit and SVG main circuits.The current detecting part of the current detecting of fault electric arc and reacance generator is shared, using same detection signal, fault electric arc analysis is carried out simultaneously using common main control unit and reactive current is calculated, enable devices to be sampled out before fault electric arc characteristic current is compensated, it is ensured that the accurate detection of fault electric arc.Fault arc detection method therein is used as premise by the use of the result of determination of current difference parameter, fault electric arc is judged using relative harmonic content rate of change, the interference of nonlinear load can be effectively excluded, while being judged using four kinds of judging means, fault electric arc is accurately detected.
Description
Technical field
It is more particularly to a kind of to detect function with fault electric arc the present invention relates to Power Quality Detection administrative skill field
Silent oscillation reacance generator and method.
Background technology
With continuing to develop for China's economy, various electrical equipments are on the increase needed for production and living, accordingly, power train
The part of system is more and more, and working condition is also more complicated and changeable, and this just greatly increases the hair of electric power system fault
Raw probability.Fault electric arc occupies sizable ratio in the electric information fire origin cause of formation, therefore, timely and accurately finds failure electricity
The appearance of arc to guarantee safe production and the lives of the people play the role of it is important.And static reacance generator (static var
Generator, SVG) as new reactive-load compensation equipment, with reactive current governing speed is fast, range of operation is wide, harmonic content
Low advantage, very important effect is served in terms of the quality of power supply and reactive-load compensation is improved.
Electric arc is a kind of gas discharge phenomenon, is that electric current passes through the moment spark produced by some dielectrics.With me
The raising of state's economic level, domestic load increase is rapid, and distribution system also becomes increasingly complex.Because distribution line space has
Many wire bindings together, can cause cable insulation to suffer damage when electricity consumption is in overload state in limit, distribution box, and then
Produce fault electric arc and trigger electrical fire.In addition, when loose contact between circuit and circuit or the influence of environment factor, using
Fault electric arc can be produced during electric break-make situation, at tie point and then triggers fire.Due to fault electric arc voltage effective value with it is non-
During failure voltage effective value approach, when break down electric arc when, protection device would become hard to find.
However, due to the installation of silent oscillation reacance generator, the high frequency harmonic components in electric current are possible to be compensated to lead
Cause original fault electric arc detection equipment can not normally detect fault electric arc, influence the normal work of fault electric arc detection equipment.
Meanwhile, the use of the nonlinear load such as electric capacity, inductance, IGCT, IGBT can cause the current harmonics in circuit,
Also conventional fault arc detection method can be made to occur failing to judge, judge by accident.And if can be arranged using the rate of change of relative harmonic content
Except the interference of nonlinear load, in this way, emphasis compares its rate of change, if accessing nonlinear load in circuit, triggers
Relative harmonic content increase is transfinited, but its rate of change will not transfinite.Only break down electric arc when, relative harmonic content can acutely become
Change, the rate of change of adjacent two cycles m-Acetyl chlorophosphonazo containing ratio can transfinite, so as to be determined as fault electric arc.At present, also without this profit
The method judged with the rate of change of relative harmonic content fault electric arc.
The content of the invention
In order to solve problem described in background technology, the present invention provides a kind of silent oscillation that function is detected with fault electric arc
Reacance generator and method, the current detecting part of the current detecting of fault electric arc and reacance generator is shared, and is used
Same detection signal, carries out fault electric arc analysis using common main control unit and reactive current is calculated, enable device simultaneously
It is enough to be sampled out before fault electric arc characteristic current is compensated, it is ensured that the accurate detection of fault electric arc.Fault electric arc therein
Detection method is carried out by the use of the result of determination of current difference parameter as premise using relative harmonic content rate of change to fault electric arc
Judge, can effectively exclude the interference of nonlinear load, while being judged using four kinds of judging means, accurate detection is out of order
Electric arc.
In order to achieve the above object, the present invention is realized using following technical scheme：
It is a kind of with fault electric arc detect function silent oscillation reacance generator, including voltage sensor, current sensor,
Sample circuit, signal processing circuit, main control MCU, arc fault warning circuit, switching value spacing output circuit, IGBT driving electricity
Road and SVG main circuits；
Described main control MCU connects voltage sensor and current sensor by signal processing circuit and sample circuit, main
After control MCU calculates same voltage and current sample signal respectively through fault electric arc analysis and reactive current, event is carried out respectively
Hinder electric arc warning output and IGBT control outputs；Enable devices to be sampled out before fault electric arc characteristic current is compensated
Come, it is ensured that the accurate detection of fault electric arc.
Described main control MCU also controls power supply while fault electric arc alarm is exported by switching value spacing output circuit
The disconnection of breaker, cuts off the electricity supply during failure.
Described SVG major loops are electronic power convertor, including multigroup IGBT units, two level of composition or three level three
Phase voltage source type transverter topology, can also constitute split-phase H bridge structural topologies, described main control MCU passes through IGBT drive circuit
Export the reactive current in IGBT trigger pulse, real-Time Compensation power network.
A kind of control method for the silent oscillation reacance generator that function is detected with fault electric arc, comprises the following steps：
Step 1: electric on system initialization, device；
Step 2: acquisition system three-phase voltage and three-phase current, and signal is delivered into signal modulation process circuit；
Step 3: signal modulation process circuit is modulated processing to voltage and current signal respectively, and will be modulated after
Signal deliver to main control MCU unit；
Step 4: main control MCU unit is calculated the reactive current numerical value of system by sample rate current, voltage parameter；Meanwhile, it is right
Current signal processing, extracts arc current characteristic value；
Step 5: reactive current of the main control MCU unit according to calculating, draws the compensation magnitude of current that SVG needs, generation triggering
Pulse, controls reactive current in IGBT, real-Time Compensation power network；
Meanwhile, main control MCU unit carries out analysis judgement, such as according to logical calculated is passed through to extracting arc current characteristic value
Meet fault electric arc signal, then send instruction to fault electric arc warning module, and cut off the electricity supply breaker by output signal, cut
Disconnected fault electric arc；As do not met, instruction, and return to step two are not sent.
Fault arc detection method in a kind of silent oscillation reacance generator that function is detected with fault electric arc, using four
The condition of kind judges jointly, and one of which decision condition is by the use of the result of determination of current difference parameter as premise, using humorous
Ripple containing ratio rate of change judged fault electric arc, effective detection can be out of order electric arc in complex situations, including as follows
Step：
Step 1：Persistently electric current is sampled (according to actual hardware situation, each cycle adopts 64 or 128 points)；
Step 2：The sampled value of electric current is 128 each cycles or 64 each cycles.Exemplified by 64 points, current sampling data is remembered
For I0、I1、……、I63, normal cycle electric current is designated as In0、In1、……、In63(sampled value and normal value are perunit value).Calculate
The difference parameter of current sampling period electric current and normal cycle electric current：
By IperWith threshold value S1Compare, if Iper＞ S1, then normal cycle current value is given by sampled current value width, updates normal
Periodic current value；If Iper＞ S1, then calculating is further analyzed to judge whether to be occurred by fault electric arc；
Step 3：The average value of calculating current：
Judge whether the positive-negative half-cycle of electric current is symmetrical with the average value of electric current.If IaveMore than given threshold value S2, then it is assumed that
Waveform symmetry is unsatisfactory for requiring, is that waveform symmetry indicates parameter m1 assignment 1, is otherwise m1 assignment 0；
Step 4：Calculate the difference of the two neighboring sampled value of sample rate current：
ΔIk=Ik+1-Ik(k=0,1,2 ... 62) (3)
With the maximum K of the differencev=max [Δ I0, Δ I1..., Δ I62] represent the maximum rate of change of electric current.If Kv
It is current changing rate parameter m2 assignment 1 more than threshold value S3, then it is assumed that current changing rate is excessive, otherwise m2 is entered as zero；
Step 5：The wave mode parameter of calculating current：
Wherein, α is configured according to actual current, typically takes normal current peak value.Can be with table with the wave mode parameter of electric current
Show whether electric current contains flat shoulder.If KpMore than threshold value S4, then it is assumed that electric current contains flat shoulder, parameter m3 is indicated for flat shoulder
Assignment 1, otherwise m3 be entered as zero；
Step 6：Detect sample rate current harmonic wave with FFT, calculate sample rate current higher hamonic wave (calculate the 3rd herein, 5,7,9 times
Harmonic wave) containing ratio rate of change Δ PnIf, Δ PnIt is that harmonic wave is indicated more than threshold value S4, then it is assumed that sample rate current harmonic content is abnormal
Parameter m4 is entered as 1, is otherwise entered as 0；
Step 7：Calculate the sum of four instruction parameters in 3~step 6 of above-mentioned steps, i.e. m=m1+m2+m3+m4；If m>=
2, fault electric arc cycle indicates parameter sum=sum+1, if sum>=6, then trigger alarm signal；If sum<6, then return to step
Rapid 2 continue to differentiate；If m<2, then it is assumed that there is no fault electric arc, it is sum assignment 0, and normal current is updated to now
Sample rate current.
Step 6 is comprised the following steps that：
Step 601. calculates sampling period odd harmonic containing ratio rate of change Δ PnWith given threshold Δ PthCompare；Harmonic wave
Containing ratio is defined asWherein I1For fundamental current, IhFor the root-mean-square value of h subharmonic currents,Xh1For h subharmonic current sampled values, M be take 3 in sampling number, this example, 5,7,9 times it is humorous
Ripple, calculating odd harmonic containing ratio is
Step 602. is based on the 1st normal power frequency sampling period electric current odd harmonic containing ratio P that step 2 is judged
Value, calculates two neighboring power frequency sampling period electric current odd harmonic containing ratio rate of change Δ Pn, Δ Pn=Pn- P, double sampling week
The difference of electric current odd harmonic containing ratio is sampling period odd harmonic containing ratio rate of change Δ P between phasen。
Compared with prior art, the beneficial effects of the invention are as follows：
1st, a kind of silent oscillation reacance generator that function is detected with fault electric arc of the invention, by the electric current of fault electric arc
Detection and the current detecting part of reacance generator are shared, and using same detection signal, are enabled devices in fault electric arc
Characteristic current is sampled out before being compensated, it is ensured that the accurate detection of fault electric arc.
2nd, a kind of silent oscillation reacance generator and its control method that function is detected with fault electric arc of the invention, is utilized
Same main control MCU is handled same current data, and fault electric arc characteristic value and reactive current value are calculated respectively, respectively pair event
Barrier electric arc warning circuit and SVG IGBT drive circuit are controlled, and perfectly realize and two kinds of functions are realized with individual equipment
While take into account and use, effectively solve to cause the problem of fault electric arc is failed to judge, judged by accident due to the use of reacance generator.
3rd, the fault electric arc detection side of a kind of silent oscillation reacance generator that function is detected with fault electric arc of the invention
Method, by the use of the result of determination of current difference parameter as premise, is judged fault electric arc using relative harmonic content rate of change,
The interference of nonlinear load can be effectively excluded, while being judged using four kinds of judging means, fault electric arc is accurately detected.
Brief description of the drawings
Fig. 1 is a kind of structural representation of silent oscillation reacance generator that function is detected with fault electric arc of the present invention；
Fig. 2 controls for a kind of main control MCU of silent oscillation reacance generator that function is detected with fault electric arc of the present invention
Structural representation；
Fig. 3 is a kind of two electricity of the embodiment of silent oscillation reacance generator that function is detected with fault electric arc of the present invention
Flat SVG major loop structures figure；
Fig. 4 is a kind of three electricity of the embodiment of silent oscillation reacance generator that function is detected with fault electric arc of the present invention
Flat SVG major loop structures figure；
Fig. 5 is a kind of split-phase of the embodiment of silent oscillation reacance generator that function is detected with fault electric arc of the present invention
H bridge structure SVG major loop structure figures；
Fig. 6 is the fault electric arc inspection in a kind of silent oscillation reacance generator that function is detected with fault electric arc of the present invention
Survey method flow diagram.
Embodiment
The embodiment provided below in conjunction with accompanying drawing the present invention is described in detail.
As shown in figure 1, a kind of silent oscillation reacance generator that function is detected with fault electric arc, including voltage sensor,
Current sensor, sample circuit, signal processing circuit, main control MCU, arc fault warning circuit, switching value spacing output circuit,
IGBT drive circuit and SVG main circuits；
As shown in Fig. 2 described main control MCU connects voltage sensor and electric current by signal processing circuit and sample circuit
Sensor, after main control MCU calculates same voltage and current sample signal respectively through fault electric arc analysis and reactive current, point
Carry out not fault electric arc warning output and IGBT control outputs；Enable devices to the quilt before fault electric arc characteristic current is compensated
Sampling comes out, it is ensured that the accurate detection of fault electric arc.
Described main control MCU also controls power supply while fault electric arc alarm is exported by switching value spacing output circuit
The disconnection of breaker, cuts off the electricity supply during failure.
Described SVG major loops are electronic power convertor, including multigroup IGBT units, two level of composition or three level three
Phase voltage source type transverter topology, can also constitute split-phase H bridge structural topologies, described main control MCU passes through IGBT drive circuit
Export the reactive current in IGBT trigger pulse, real-Time Compensation power network.
As shown in figure 3, to use two level three-phase voltage source type transverters topology in embodiment.Six groups are included in topology
IGBT units.
As shown in figure 4, to use three-level three-phase voltage source converter topology in embodiment.12 groups are included in topology
IGBT units.
As shown in figure 5, to use split-phase H bridge structure three-phase voltage source types transverter topology in embodiment.Included in topology
Three groups of IGBT units.
A kind of control method for the silent oscillation reacance generator that function is detected with fault electric arc, comprises the following steps：
Step 1: electric on system initialization, device；
Step 2: acquisition system three-phase voltage and three-phase current, and signal is delivered into signal modulation process circuit；
Step 3: signal modulation process circuit is modulated processing to voltage and current signal respectively, and will be modulated after
Signal deliver to main control MCU unit；
Step 4: main control MCU unit is calculated the reactive current numerical value of system by sample rate current, voltage parameter；Meanwhile, it is right
Current signal processing, extracts arc current characteristic value；
Step 5: reactive current of the main control MCU unit according to calculating, draws the compensation magnitude of current that SVG needs, generation triggering
Pulse, controls reactive current in IGBT, real-Time Compensation power network；
Meanwhile, main control MCU unit carries out analysis judgement, such as according to logical calculated is passed through to extracting arc current characteristic value
Meet fault electric arc signal, then send instruction to fault electric arc warning module, and cut off the electricity supply breaker by output signal, cut
Disconnected fault electric arc；As do not met, instruction, and return to step two are not sent.
As shown in fig. 6, the fault electric arc detection in a kind of silent oscillation reacance generator that function is detected with fault electric arc
Method, is judged jointly using four kinds of conditions, and one of which decision condition by the use of current difference parameter result of determination as
Premise, is judged fault electric arc using relative harmonic content rate of change, effective detection can be out of order electricity in complex situations
Arc, comprises the following steps：
Step 1：Persistently electric current is sampled (according to actual hardware situation, each cycle adopts 64 or 128 points)；
Step 2：The sampled value of electric current is 128 each cycles or 64 each cycles.Exemplified by 64 points, current sampling data is remembered
For I0、I1、……、I63, normal cycle electric current is designated as In0、In1、……、In63(sampled value and normal value are perunit value).Calculate
The difference parameter of current sampling period electric current and normal cycle electric current：
By IperWith threshold value S1Compare, if Iper≤S1, then normal cycle current value is given by sampled current value width, updates normal
Periodic current value；If Iper＞ S1, then calculating is further analyzed to judge whether to be occurred by fault electric arc；
Step 3：The average value of calculating current：
Judge whether the positive-negative half-cycle of electric current is symmetrical with the average value of electric current.If IaveMore than given threshold value S2, then it is assumed that
Waveform symmetry is unsatisfactory for requiring, is that waveform symmetry indicates parameter m1 assignment 1, is otherwise m1 assignment 0；
Step 4：Calculate the difference of the two neighboring sampled value of sample rate current：
ΔIk=Ik+1-Ik(k=0,1,2 ... 62) (3)
With the maximum K of the differencev=max [Δ I0, Δ I1..., Δ I62] represent the maximum rate of change of electric current.If Kv
It is current changing rate parameter m2 assignment 1 more than threshold value S3, then it is assumed that current changing rate is excessive, otherwise m2 is entered as zero；
Step 5：The wave mode parameter of calculating current：
Wherein, α is configured according to actual current, typically takes normal current peak value.Can be with table with the wave mode parameter of electric current
Show whether electric current contains flat shoulder.If KpMore than threshold value S4, then it is assumed that electric current contains flat shoulder, parameter m3 is indicated for flat shoulder
Assignment 1, otherwise m3 be entered as zero；
Step 6：Detect sample rate current harmonic wave with FFT, calculate sample rate current higher hamonic wave (calculate the 3rd herein, 5,7,9 times
Harmonic wave) containing ratio rate of change Δ PnIf, Δ PnIt is that harmonic wave is indicated more than threshold value S4, then it is assumed that sample rate current harmonic content is abnormal
Parameter m4 is entered as 1, is otherwise entered as 0；
Step 7：Calculate the sum of four instruction parameters in 3~step 6 of above-mentioned steps, i.e. m=m1+m2+m3+m4；If m>=
2, fault electric arc cycle indicates parameter sum=sum+1, if sum>=6, then trigger alarm signal；If sum<6, then return to step
Rapid 2 continue to differentiate；If m<2, then it is assumed that there is no fault electric arc, it is sum assignment 0, and normal current is updated to now
Sample rate current.
Step 6 is comprised the following steps that：
Step 601. calculates sampling period odd harmonic containing ratio rate of change Δ PnWith given threshold Δ PthCompare；Harmonic wave
Containing ratio is defined asWherein I1For fundamental current, IhFor the root-mean-square value of h subharmonic currents,Xh1For h subharmonic current sampled values, M be take 3 in sampling number, this example, 5,7,9 times it is humorous
Ripple, calculating odd harmonic containing ratio is
Step 602. is based on the 1st normal power frequency sampling period electric current odd harmonic containing ratio P that step 2 is judged
Value, calculates two neighboring power frequency sampling period electric current odd harmonic containing ratio rate of change Δ Pn, Δ Pn=Pn- P, double sampling week
The difference of electric current odd harmonic containing ratio is sampling period odd harmonic containing ratio rate of change Δ P between phasen。
A kind of silent oscillation reacance generator that function is detected with fault electric arc of the present invention, the electric current of fault electric arc is examined
The current detecting part surveyed with reacance generator is shared, using same detection signal, is enabled devices to special in fault electric arc
Levy before electric current is compensated and be sampled out, it is ensured that the accurate detection of fault electric arc.
A kind of silent oscillation reacance generator and its control method that function is detected with fault electric arc of the present invention, using same
One main control MCU is handled same current data, fault electric arc characteristic value and reactive current value is calculated respectively, respectively to failure
Electric arc warning circuit and SVG IGBT drive circuit are controlled, and perfectly realize and two kinds of functions are realized with individual equipment
Take into account and use simultaneously, effectively solve to cause the problem of fault electric arc is failed to judge, judged by accident due to the use of reacance generator.
A kind of fault arc detection method of silent oscillation reacance generator that function is detected with fault electric arc of the present invention,
By the use of the result of determination of current difference parameter as premise, fault electric arc is judged using relative harmonic content rate of change, can
Effectively to exclude the interference of nonlinear load, while being judged using four kinds of judging means, fault electric arc is accurately detected.
Above example is implemented lower premised on technical solution of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to the above embodiments.Method therefor is such as without spy in above-described embodiment
It is conventional method not mentionlet alone bright.
Claims (6)
1. the silent oscillation reacance generator of function is detected with fault electric arc a kind of, including voltage sensor, current sensor, is adopted
Sample circuit, signal processing circuit, main control MCU, arc fault warning circuit, switching value spacing output circuit, IGBT drive circuit
With SVG main circuits；
Characterized in that, described main control MCU connects voltage sensor by signal processing circuit and sample circuit and electric current is passed
Sensor, after main control MCU calculates same voltage and current sample signal respectively through fault electric arc analysis and reactive current, respectively
Carry out fault electric arc warning output and IGBT control outputs；Enable devices to be adopted before fault electric arc characteristic current is compensated
Sample comes out, it is ensured that the accurate detection of fault electric arc.
2. a kind of silent oscillation reacance generator that function is detected with fault electric arc according to claim 1, its feature exists
In described main control MCU also controls electric power disconnection while fault electric arc alarm is exported by switching value spacing output circuit
The disconnection of device, cuts off the electricity supply during failure.
3. a kind of silent oscillation reacance generator that function is detected with fault electric arc according to claim 1, its feature exists
In, described SVG major loops be electronic power convertor, including multigroup IGBT units, two level of composition or three-level three-phase electricity
Potential source type transverter topology, can also constitute split-phase H bridge structural topologies, described main control MCU is exported by IGBT drive circuit
Reactive current in IGBT trigger pulse, real-Time Compensation power network.
4. it is a kind of with fault electric arc detect function silent oscillation reacance generator control method, it is characterised in that including with
Lower step：
Step 1: electric on system initialization, device；
Step 2: acquisition system three-phase voltage and three-phase current, and signal is delivered into signal modulation process circuit；
Step 3: signal modulation process circuit is modulated processing to voltage and current signal respectively, and will be modulated after letter
Number deliver to main control MCU unit；
Step 4: main control MCU unit is calculated the reactive current numerical value of system by sample rate current, voltage parameter；Meanwhile, to electric current
Signal transacting, extracts arc current characteristic value；
Step 5: reactive current of the main control MCU unit according to calculating, draws the compensation magnitude of current that SVG needs, generation triggering arteries and veins
Punching, controls reactive current in IGBT, real-Time Compensation power network；
Meanwhile, main control MCU unit carries out analysis judgement to extracting arc current characteristic value, such as met according to logical calculated is passed through
Fault electric arc signal, then send instruction to fault electric arc warning module, and breaker, cut-out cut off the electricity supply by output signal therefore
Hinder electric arc；As do not met, instruction, and return to step two are not sent.
5. a kind of fault arc detection method in silent oscillation reacance generator that function is detected with fault electric arc, its feature exists
In, judged jointly using four kinds of conditions, and one of which decision condition by the use of current difference parameter result of determination as preceding
Carry, fault electric arc judged using relative harmonic content rate of change, effective detection can be out of order electric arc in complex situations,
Comprise the following steps：
Step 1：Persistently electric current is sampled, according to actual hardware situation, each cycle adopts 64 or 128 points；
Step 2：The sampled value of electric current is 128 each cycles or 64 each cycles；Exemplified by 64 points, current sampling data is designated as I0、
I1、……、I63, normal cycle electric current is designated as In0、In1、……、In63, sampled value and normal value are perunit value；Calculate current
Sampling period electric current and normal cycle electric current difference parameter：
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By IperWith threshold value S1Compare, if Iper≤S1, then normal cycle current value is given by sampled current value width, updates normal cycle
Current value；If Iper＞ S1, then calculating is further analyzed to judge whether to be occurred by fault electric arc；
Step 3：The average value of calculating current：
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Judge whether the positive-negative half-cycle of electric current is symmetrical with the average value of electric current；If IaveMore than given threshold value S2, then it is assumed that waveform
Symmetry is unsatisfactory for requiring, is that waveform symmetry indicates parameter m1 assignment 1, is otherwise m1 assignment 0；
Step 4：Calculate the difference of the two neighboring sampled value of sample rate current：
ΔIk=Ik+1-Ik(k=0,1,2 ... 62) (3)
With the maximum K of the differencev=max [Δ I0, Δ I1..., Δ I62] represent the maximum rate of change of electric current；If KvIt is more than
Threshold value S3, then it is assumed that current changing rate is excessive, is current changing rate parameter m2 assignment 1, and otherwise m2 is entered as zero；
Step 5：The wave mode parameter of calculating current：
<mrow>
<msub>
<mi>K</mi>
<mi>p</mi>
</msub>
<mo>=</mo>
<msubsup>
<mi>&Sigma;</mi>
<mrow>
<mi>k</mi>
<mo>=</mo>
<mn>0</mn>
</mrow>
<mn>63</mn>
</msubsup>
<msub>
<mi>d</mi>
<mi>k</mi>
</msub>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>4</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, α is configured according to actual current, typically takes normal current peak value；It can be represented with the wave mode parameter of electric current
Whether electric current contains flat shoulder；If KpMore than threshold value S4, then it is assumed that electric current contains flat shoulder, parameter m3 assignment is indicated for flat shoulder
1, otherwise m3 be entered as zero；
Step 6：Sample rate current harmonic wave is detected with FFT, sample rate current higher hamonic wave containing ratio rate of change is calculated, calculating the 3rd herein,
5th, 7,9 subharmonic containing ratio rate of change Δ PnIf, Δ PnIt is humorous more than threshold value S4, then it is assumed that sample rate current harmonic content is abnormal
Ripple indicates that parameter m4 is entered as 1, is otherwise entered as 0；
Step 7：Calculate the sum of four instruction parameters in 3~step 6 of above-mentioned steps, i.e. m=m1+m2+m3+m4；If m>=2, therefore
Hinder electric arc cycle and indicate parameter sum=sum+1, if sum>=6, then trigger alarm signal；If sum<6, then return to step 2 after
It is continuous to differentiate；If m<2, then it is assumed that there is no fault electric arc, be sum assignment 0, and by normal current be updated to now sampling electricity
Stream.
6. the failure electricity in a kind of silent oscillation reacance generator that function is detected with fault electric arc according to claim 5
Arc detection method, it is characterised in that step 6 is comprised the following steps that：
Step 601. calculates sampling period odd harmonic containing ratio rate of change Δ PnWith given threshold Δ PthCompare；Harmonic wave contains
Rate is defined asWherein I1For fundamental current, IhFor the root-mean-square value of h subharmonic currents,Xh1For h subharmonic current sampled values, M be take 3 in sampling number, this example, 5,7,9 times it is humorous
Ripple, calculating odd harmonic containing ratio is
Step 602. value based on the 1st normal power frequency sampling period electric current odd harmonic containing ratio P that step 2 is judged,
Calculate two neighboring power frequency sampling period electric current odd harmonic containing ratio rate of change Δ Pn, Δ Pn=Pn- P, the double sampling cycle it
Between electric current odd harmonic containing ratio difference be sampling period odd harmonic containing ratio rate of change Δ Pn。
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