CN108398655A - The output ground fault detection method and sampled signal processing method of gird-connected inverter - Google Patents
The output ground fault detection method and sampled signal processing method of gird-connected inverter Download PDFInfo
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- CN108398655A CN108398655A CN201810183140.5A CN201810183140A CN108398655A CN 108398655 A CN108398655 A CN 108398655A CN 201810183140 A CN201810183140 A CN 201810183140A CN 108398655 A CN108398655 A CN 108398655A
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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
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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Abstract
Disclosure of the invention is used for the output ground fault detection method of gird-connected inverter, is suitable for grid-connected end three-phase five-wire mode network system and the abnormal detection of power grid ground wire occurs.The invention also discloses a kind of sampled signal processing methods for gird-connected inverter, for being handled sampled data when detecting that power grid ground connection is abnormal, to correct the sampling exception of three-phase grid-connected inverter as caused by ground connection exception and eliminate its influence to inverter self-test.A kind of output ground fault detection method for gird-connected inverter, including step A, B, wherein：Step A, judge whether the difference Vn_pe between three-phase inverter N point voltages and PE point voltages is more than first threshold；When the judging result of step A is true, B is thened follow the steps；Step B, judge whether three-phase inversion voltage and the absolute value of the difference of the difference Vn_pe are respectively less than second threshold respectively；When the judging result of step B is true, then it is determined as that output ground connection is abnormal.
Description
Technical field
The present invention relates to three-phase grid-connected inverter fields, and in particular to a kind of output for gird-connected inverter is grounded（That is,
N points in three-phase and there is floating pressure between ground wire PE）Fault detection method and sampled signal processing method based on this.
Background technology
In power grid, especially rural power grids, power grid broad covered area, different edaphic condition lacks maintenance and low cost
Equipment deficiency causes rural power grids ground wire PE etching problems serious.N line potential anomalies are will result in this way, due to inverter electricity
Net terminated line is three-phase five-wire mode, and the sampling of power grid end will after N point potential anomalies to N line sample modes using L lines
Cause inverter sampling abnormal, causes inverter self-test abnormal.
Invention content
An object of the present invention is to provide a kind of output ground fault detection method for gird-connected inverter, is suitable for
The abnormal detection of power grid ground wire occurs for grid-connected end three-phase five-wire mode network system, and ground wire is abnormal to lead to N lines current potential and PE
Between potential difference it is abnormal, it is abnormal to form inverter detection power grid ground connection.
The second object of the present invention is to provide a kind of sampled signal processing method for gird-connected inverter, for detecting
Sampled data is handled when being grounded abnormal to power grid, to correct the sampling of the three-phase grid-connected inverter as caused by ground connection exception
Exception simultaneously eliminates its influence to inverter self-test.
On the one hand, the technical solution adopted by the present invention is：
A kind of output ground fault detection method for gird-connected inverter, including step A, B, wherein：
Step A, judge whether the difference Vn_pe between three-phase inverter N point voltages and PE point voltages is more than first threshold；
When the judging result of step A is true, B is thened follow the steps；
Step B, judge whether three-phase inversion voltage and the absolute value of the difference of the difference Vn_pe are respectively less than the second threshold respectively
Value；
When the judging result of step B is true, then it is determined as that output ground connection is abnormal.
In one embodiment, judge whether the root-mean-square value of the difference Vn_pe is more than first threshold in step A；Step B
The middle root-mean-square value for judging the three-phase inversion voltage respectively and the absolute value of the difference of the root-mean-square value of the difference Vn_pe are
It is no to be respectively less than the second threshold.
In one embodiment, step B is specifically included：
Calculate separately out the root-mean-square value of three-phase inversion voltage Vinv；
The absolute of the root-mean-square value of the three-phase inversion voltage Vinv and the difference of the root-mean-square value of the difference Vn_pe is taken respectively
Value；
Judge whether three absolute values of corresponding three-phase inversion voltage are respectively less than the second threshold；
If the respectively less than described second threshold, it is determined as that output ground connection is abnormal.
In another specific embodiment, include the following steps：
The root-mean-square value of difference Vn_pe between S01, calculating three-phase inverter N point voltages and PE point voltages；
S02, judge whether the root-mean-square value of the difference Vn_pe is more than first threshold；If more than first threshold, then continue to execute
Following steps；
S03, the root-mean-square value for calculating separately out three-phase inversion voltage Vinv；
S04, the root-mean-square value for taking the three-phase inversion voltage Vinv respectively and the difference of the root-mean-square value of the difference Vn_pe
Absolute value；
S05, judge whether three absolute values of corresponding three-phase inversion voltage are respectively less than the second threshold；If respectively less than institute
Second threshold is stated, then is determined as that output ground connection is abnormal.
Specifically, the first threshold is 40V；The second threshold is 10V.
On the other hand, the technical solution adopted by the present invention is：
A kind of sampled signal processing method for gird-connected inverter is determined using the output ground fault detection method
After output ground connection exception, following steps C is executed：Inverter voltage Vinv switch periods ADC sampled signal instantaneous values subtract N points and PE
The voltage difference Vn_pe switch periods ADC sampled signal instantaneous values of point, then calculate root-mean-square value, the inversion electricity that show that treated
It is pressed with valid value, inverter voltage virtual value carries out equipment self-inspection operation with treated.
In one embodiment, it in turn includes the following steps：
The root-mean-square value of difference Vn_pe between S01, calculating three-phase inverter N point voltages and PE point voltages；
S02, judge whether the root-mean-square value of the difference Vn_pe is more than first threshold；If more than first threshold, then continue to execute
Following steps；
S03, the root-mean-square value for calculating separately out three-phase inversion voltage Vinv；
S04, the root-mean-square value for taking the three-phase inversion voltage Vinv respectively and the difference of the root-mean-square value of the difference Vn_pe
Absolute value；
S05, judge whether three absolute values of corresponding three-phase inversion voltage are respectively less than the second threshold；If respectively less than institute
Second threshold is stated, then is determined as that output ground connection is abnormal, continues to execute following steps;
S06, inverter voltage Vinv switch periods ADC sampled signal instantaneous values subtract the voltage difference Vn_pe switches of N points and PE points
Period ADC sampled signal instantaneous value, then calculate root-mean-square value, the inverter voltage virtual value that show that treated；
S07, with treated, inverter voltage virtual value carries out equipment self-inspection operation.
Specifically, the first threshold is 40V；The second threshold is 10V.
The present invention uses above scheme, has the following advantages that compared with prior art：
Under the existing hardware sampling structure of gird-connected inverter, the method that proposes through the invention can be effectively detected out grid-connected
Whether inverter power grid ground wire has earth fault, and sampled signal processing method through the invention, can effectively solve
Certainly inverter self-test abnormal problem, it is therefore prevented that under normal circumstances, break down inverter apparatus report.
Description of the drawings
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical scheme of the present invention
It is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, other drawings may also be obtained based on these drawings.
Attached drawing 1 is the flow chart of the fault detection method of embodiment 1；
Attached drawing 2 is the flow chart of the sampled signal processing method of embodiment 2.
Specific implementation mode
The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be understood by the person skilled in the art.It should be noted that the explanation for these embodiments is used to help
Understand the present invention, but does not constitute limitation of the invention.In addition, involved in the various embodiments of the present invention described below
And to technical characteristic can be combined with each other as long as they do not conflict with each other.
Embodiment 1
The present embodiment provides a kind of output ground fault detection methods for gird-connected inverter, specially detect grid-connected end three-phase
Whether five-wire system network system occurs power grid ground wire exception, and ground wire is abnormal to lead to potential difference between N lines current potential and PE
Often, it is abnormal to form inverter detection power grid ground connection.With reference to shown in attached drawing 1, the flow of the output ground fault detection method is as follows：
The root-mean-square value Rms of difference Vn_pe between S01, calculating three-phase inverter N point voltages and PE point voltages；
S02, judge whether the root-mean-square value of the difference Vn_pe is more than 40V；
If the root-mean-square value of the difference Vn_pe is not more than first threshold, end fault detection returns；If the difference Vn_
The root-mean-square value of pe is more than first threshold, then judging result is true, continues to execute following steps；
S03, three-phase inversion voltage Vinv is calculated separately out（Specially VinvR, VinvS and VinvT）Root-mean-square value Rms；
S04, the root-mean-square value for taking the three-phase inversion voltage Vinv respectively and the difference of the root-mean-square value of the difference Vn_pe
Absolute value ValR, ValS and ValT；
S05, judge whether three described absolute value ValR, ValS and ValT of corresponding three-phase inversion voltage are respectively less than 10V；
If ValR, ValS and ValT are respectively less than 10V, it is determined as that output ground connection is abnormal；Otherwise end fault detection returns.
Output ground fault detection method provided in this embodiment can be adopted based on the existing hardware of three-phase grid-connected inverter
Spline structure effectively detects that gird-connected inverter power grid whether there is earth fault in the case of additionally not increasing sampling hardware.
Embodiment 2
The present embodiment provides a kind of sampled signal processing methods for gird-connected inverter, specially detect grid-connected end Three-phase five-wire
Whether network system processed occurs power grid ground wire exception, and sampling exception is corrected after judging to be grounded exception.With reference to 2 institute of attached drawing
Show, the flow of the sampled signal processing method is as follows：
The root-mean-square value Rms of difference Vn_pe between S01, calculating three-phase inverter N point voltages and PE point voltages；
S02, judge whether the root-mean-square value of the difference Vn_pe is more than 40V；
If the root-mean-square value of the difference Vn_pe is not more than first threshold, end fault detection returns；If the difference Vn_
The root-mean-square value of pe is more than first threshold, then judging result is true, continues to execute following steps；
S03, three-phase inversion voltage Vinv is calculated separately out（Specially VinvR, VinvS and VinvT）Root-mean-square value Rms；
S04, the root-mean-square value for taking the three-phase inversion voltage Vinv respectively and the difference of the root-mean-square value of the difference Vn_pe
Absolute value ValR, ValS and ValT；
S05, judge whether three described absolute value ValR, ValS and ValT of corresponding three-phase inversion voltage are respectively less than 10V；
If ValR, ValS and ValT are respectively less than 10V, it is determined as that output ground connection is abnormal；Otherwise end fault detection returns；
S06, inverter voltage Vinv switch periods ADC sampled signal instantaneous values（VinvR_adc, VinvS_adc and VinvT_adc）
The voltage difference Vn_pe switch periods ADC sampled signal instantaneous value Vn_pe_adc of N points and PE points are subtracted, then calculate root mean square
Value, the inverter voltage virtual value that show that treated；
S07, with treated, inverter voltage virtual value carries out equipment self-inspection operation.
Sampled signal processing method provided in this embodiment can be sampled based on the existing hardware of three-phase grid-connected inverter and be tied
Structure effectively detects gird-connected inverter power grid with the presence or absence of earth fault in the case of additionally not increasing sampling hardware, and
After detecting ground connection exception, sampled data is handled, to correct the three-phase grid-connected inverter as caused by ground connection exception
Sampling exception simultaneously eliminates its influence to inverter self-test.
The above embodiments merely illustrate the technical concept and features of the present invention, is a kind of preferred embodiment, and purpose exists
It cans understand the content of the present invention and implement it accordingly in person skilled in the art, the protection of the present invention can not be limited with this
Range.Equivalent transformation or modification made by all Spirit Essences according to the present invention, should all cover protection scope of the present invention it
It is interior.
Claims (8)
1. a kind of output ground fault detection method for gird-connected inverter, which is characterized in that including step A, B, wherein：
Step A, judge whether the difference Vn_pe between three-phase inverter N point voltages and PE point voltages is more than first threshold；
When the judging result of step A is true, B is thened follow the steps；
Step B, judge that the absolute value of the difference of three-phase inversion voltage and the difference Vn_pe is no to be less than the second threshold respectively
Value；
When the judging result of step B is true, then it is determined as that output ground connection is abnormal.
2. output ground fault detection method according to claim 1, which is characterized in that judge the difference in step A
Whether the root-mean-square value of Vn_pe is more than first threshold；Root-mean-square value and the institute of the three-phase inversion voltage are judged in step B respectively
Whether the absolute value for stating the difference of the root-mean-square value of difference Vn_pe is respectively less than the second threshold.
3. output ground fault detection method according to claim 2, which is characterized in that step B is specifically included：
Calculate separately out the root-mean-square value of three-phase inversion voltage Vinv；
The absolute of the root-mean-square value of the three-phase inversion voltage Vinv and the difference of the root-mean-square value of the difference Vn_pe is taken respectively
Value；
Judge whether three absolute values of corresponding three-phase inversion voltage are respectively less than the second threshold；
If the respectively less than described second threshold, it is determined as that output ground connection is abnormal.
4. output ground fault detection method according to claim 2, which is characterized in that include the following steps：
The root-mean-square value of difference Vn_pe between S01, calculating three-phase inverter N point voltages and PE point voltages；
S02, judge whether the root-mean-square value of the difference Vn_pe is more than first threshold；If more than first threshold, then continue to execute
Following steps；
S03, the root-mean-square value for calculating separately out three-phase inversion voltage Vinv；
S04, the root-mean-square value for taking the three-phase inversion voltage Vinv respectively and the difference of the root-mean-square value of the difference Vn_pe
Absolute value；
S05, judge whether three absolute values of corresponding three-phase inversion voltage are respectively less than the second threshold；If respectively less than institute
Second threshold is stated, then is determined as that output ground connection is abnormal.
5. according to claim 1-4 any one of them firewire earth-fault detecting methods, which is characterized in that the first threshold
For 40V；The second threshold is 10V.
6. a kind of sampled signal processing method for gird-connected inverter, which is characterized in that using such as any one of claim 1-3
After the output ground fault detection method determines output ground connection exception, following steps C is executed：Inverter voltage Vinv switches
Period ADC sampled signal instantaneous value subtracts the voltage difference Vn_pe switch periods ADC sampled signal instantaneous values of N points and PE points, then
Root-mean-square value is calculated, the inverter voltage virtual value that show that treated, inverter voltage virtual value carries out equipment self-inspection with treated
Operation.
7. sampled signal processing method according to claim 6, which is characterized in that in turn include the following steps：
The root-mean-square value of difference Vn_pe between S01, calculating three-phase inverter N point voltages and PE point voltages；
S02, judge whether the root-mean-square value of the difference Vn_pe is more than first threshold；If more than first threshold, then continue to execute
Following steps；
S03, the root-mean-square value for calculating separately out three-phase inversion voltage Vinv；
S04, the root-mean-square value for taking the three-phase inversion voltage Vinv respectively and the difference of the root-mean-square value of the difference Vn_pe
Absolute value；
S05, judge whether three absolute values of corresponding three-phase inversion voltage are respectively less than the second threshold；If respectively less than institute
Second threshold is stated, then is determined as that output ground connection is abnormal, continues to execute following steps;
S06, inverter voltage Vinv switch periods ADC sampled signal instantaneous values subtract the voltage difference Vn_pe switches of N points and PE points
Period ADC sampled signal instantaneous value, then calculate root-mean-square value, the inverter voltage virtual value that show that treated；
S07, with treated, inverter voltage virtual value carries out equipment self-inspection operation.
8. sampled signal processing method according to claim 7, which is characterized in that the first threshold is 40V；Described
Two threshold values are 10V.
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Cited By (1)
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