CN105548755A - Method of detecting inverter AC and DC-side grounding through single grounding insulation impedance detection network - Google Patents
Method of detecting inverter AC and DC-side grounding through single grounding insulation impedance detection network Download PDFInfo
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- CN105548755A CN105548755A CN201510919913.8A CN201510919913A CN105548755A CN 105548755 A CN105548755 A CN 105548755A CN 201510919913 A CN201510919913 A CN 201510919913A CN 105548755 A CN105548755 A CN 105548755A
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- earth
- inverter
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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
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a method of detecting inverter AC and DC-side grounding through a single grounding insulation impedance detection network. The method comprises steps: a grounding insulation impedance detection network is only added to the input side of a solar array, and waveforms of the DC-side array positive electrode grounding voltage VPV+PE and the negative electrode grounding voltage VPV-PE are detected; or, the grounding insulation impedance detection network is only added to the AC output side to detect waveforms of AC-side three-phase grounding voltage VA-PE, VB-PE and VC-PE; and as for the former, AC components in the waveforms are extracted to judge the AC-side grounding condition, and as for the latter, DC components in the waveforms are extracted to judge the DC-side grounding condition. The method has the advantages that an AC/DC-side grounding detection method is brought forward, on the basis of adding the grounding insulation impedance detection network only at the input side/output side, the grounding fault of the AC output side/DC side can be judged, the detection circuit is saved, and the system composition is simplified.
Description
Technical field
The present invention relates to a kind of method being detected inverter AC and DC side joint ground by single ground insulation impedance detection network, for detecting the earth fault of solar power system.
Background technology
In field of solar thermal power generation, earth fault exists as a kind of more common fault, and in order to the reliability service of the safety and equipment that ensure personnel, Earth Fault Detection just becomes very important.
From earth point, solar battery ground connection and AC output ground connection two kind can be roughly divided into, in order to ground connection can be detected accurately, traditional way adds ground insulation impedance detection network respectively at solar battery input side and inverter outgoing side, by detecting impedance network change in voltage over the ground, judge the Grounding of inverter apparatus or solar battery.This kind of scheme not only needs two cover impedance detection network and testing circuits, waste and detect resource and add cost, and two impedance networks also can influence each other, and cause detection to occur error.
Traditional system earth Sampling network as shown in Figure 1, judges respectively by the square formation ground insulation impedance detection network of DC side and the earth fault of AC earth insulation impedance Sampling network to alternating current-direct current side, V
pVfor the voltage between DC side square formation both positive and negative polarity.When after generation earth fault, DC side is by judging square formation positive pole voltage-to-ground V
pV+PEwith negative pole voltage-to-ground V
pV-PEdC partial voltage situation carry out failure judgement, AC is then exchanged by direct-detection and exports voltage over the ground and judge, so just needs to overlap testing circuit and impedance network more, and it also can be affected mutually, and System's composition is comparatively complicated.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method being detected inverter AC and DC side joint ground by single ground insulation impedance detection network is provided, the first detects AC Grounding by PV side (DC side) ground insulation impedance detection network, and the alternating component detected by PV side judges AC Grounding; It two is detect DC side Grounding by AC ground insulation impedance detection network, and the DC component detected in AC voltage-to-ground judges PV side Grounding.
1, the described method being detected inverter ac side joint ground by single DC side ground insulation impedance detection network, only adds ground insulation impedance detection network at solar battery input side, detects DC side solar battery positive pole voltage-to-ground V
pV+PEwith negative pole voltage-to-ground V
pV-PEwaveform; Under normal circumstances, detection waveform is DC quantity; When after generation AC ground connection, the waveform that now DC side detects will be changed into: abs (V
pV+PE)=abs (V
pV-PE)=V
pV/ 2+V
iNV-BUSN, wherein V
pVfor the voltage between DC side solar battery both positive and negative polarity, V
iNV-BUSNfor inversion exports inverter bus mid-point voltage; The AC compounent extracted in waveform judges AC Grounding.Namely DC side Grounding is directly judged by DC earthing insulation impedance Sampling network.
If extract described AC compounent close to 0, then judge that AC earth fault does not occur, if close to V
out/ 1.732, V
outfor inverter output line voltage effective value, then judge AC generation dead ground fault, if between 0 and V
outbetween/1.732, then judge AC generation impedance earth (namely AC is by certain impedance earth).
2, the described method being detected inverter direct-flow side ground connection by single ground insulation impedance detection network, only add ground insulation impedance detection network at inverter outgoing side, add ground insulation impedance detection network respectively at AC A, B, C three-phase, detect A phase-to-ground voltage V
a-PE, B phase-to-ground voltage V
b-PE, C phase-to-ground voltage V
c-PEwaveform; Under normal circumstances, detection waveform is of ac; When after generation DC side minus earth, the AC voltage-to-ground waveform that now AC detects will change, and it detects effective value and will change into:
Wherein V
dcfor DC component ,-V
pV/ 2≤V
dc≤ V
pV/ 2, V
pVfor the voltage between DC side solar battery both positive and negative polarity, V
iNV-BUSNfor inversion exports inverter bus mid-point voltage; Extract the DC component V in waveform
dcjudge DC side Grounding.Namely AC Grounding is directly judged by AC earth insulation impedance Sampling network.
If extract described DC component close to 0, then judge that DC side earth fault does not occur; If the absolute value of DC component is close to V
pV/ 2, then judge DC side generation dead ground fault; If the absolute value of DC component is between 0 and V
pVbetween/2, then judge DC side generation impedance earth (namely DC side is by certain impedance earth).
Described direct current component value is just, then represent DC side minus earth, it is negative for being worth, then represent DC side plus earth.
Advantage of the present invention is: propose a kind of ac/dc side ground detecting method, on the basis only using input side/outgoing side ground insulation impedance detection network, the earth fault exchanging outgoing side/DC side is judged, both saved testing circuit, and also simplify System's composition.
Accompanying drawing explanation
Fig. 1 is system earth Sampling network of the prior art.
Fig. 2 is that the present invention detects ground connection schematic diagram by DC side ground insulation impedance detection network.
Fig. 3 is that the present invention detects the schematic diagram of ground connection by DC side ground insulation impedance detection network.
Fig. 4 is the detection waveform of Fig. 3 DC side under normal circumstances.
Fig. 5 is the DC side detection waveform that AC ground connection occurs.
Fig. 6 is the AC compounent gone out the waveform extracting of Fig. 5.
Fig. 7 is that the present invention detects ground connection schematic diagram by AC ground insulation impedance detection network.
Fig. 8 is that the present invention detects the schematic diagram of ground connection by AC ground insulation impedance detection network.
Fig. 9 is the detection waveform of Fig. 8 AC under normal circumstances.
Figure 10 is AC detection waveform after the minus earth of generation PV side.
Figure 11 is the DC component gone out the waveform extracting of Figure 10.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment one:
Found by analysis circuit operation characteristic, when after AC ground connection, corresponding change can be there is in the positive and negative voltage-to-ground detection waveform of DC side, AC earth insulation impedance Sampling network can be removed completely, thus to simplify circuit be as shown in Figure 2, by the square formation positive pole voltage-to-ground V detected
pV+PEwith negative pole voltage-to-ground V
pV-PEwaveform carry out corresponding analysis and just can obtain its failure message.
After any phase generation earth fault of AC of system, as shown in Figure 3, the now square formation positive pole voltage-to-ground V that detects of DC side
pV+PEwith negative pole voltage-to-ground V
pV-PEwaveform will there is change as shown in Figure 3, by original straight line, become the curve (it is relevant that ripple sent out by concrete waveform and inverter) comprising output AC side information.
So this method only needs the square formation positive pole voltage-to-ground V detected original DC side
pV+PEwith negative pole voltage-to-ground V
pV-PEdata specifically analyze and extract, analysis is carried out to its alternating component and just can judge inverter ac side whether ground connection and Grounding thereof.
Concrete determining step is as follows.In Fig. 4 ~ 6, Y value is depending on actual battery plate voltage.
1, under normal circumstances, abs (V
pV+PE)=abs (V
pV-PE)=V
pV/ 2, V
pVfor the voltage between DC side square formation both positive and negative polarity, namely detection waveform is DC quantity, as shown in Figure 4.V
pV+PEand V
pV-PEnumerical value the positive and negative detection according to circuit with definition determine, do not affect the judgement of fault.
2, when after generation AC ground connection, the now square formation positive pole voltage-to-ground V that detects of DC side
pV+PEwith negative pole voltage-to-ground V
pV-PEwaveform will there is change as shown in Figure 5: by original serial 1 waveform, be changed to waveform shown in series 2 or series 3, concrete waveform to see inverter concrete send out ripple control method, its detected value will be changed into: abs (V
pV+PE)=abs (V
pV-PE)=V
pV/ 2+V
iNV-BUSN, wherein V
iNV-BUSNfor inversion exports inverter bus mid-point voltage.
3, square formation positive pole voltage-to-ground V is now sampled
pV+PEwith negative pole voltage-to-ground V
pV-PEwaveform after, by data processing, AC compounent V wherein can be extracted
acas shown in Figure 6.
After obtaining above-mentioned data, can analyze as follows:
If 1 V
ac≈ 0, then not there is earth fault in AC.
If 2 0<V
ac<V
out/ 1.732, wherein V
outfor inverter output line voltage effective value, then AC generation impedance earth (namely AC side is by certain impedance earth, and its value neglects greatly impedance ground and ground insulation impedance detection network impedance value determines).
If 3 V
ac≈ V
out/ 1.732 (wherein V
outfor inverter output line voltage effective value), then AC generation dead ground fault.
The DC side Grounding of said method judges at this patent, scope not to be discussed, and repeats no more herein.
Embodiment two:
By the inspiration of above scheme, also DC side ground connection can be detected by AC impedance network.Detect the schematic diagram of ground connection as shown in Figure 7 by AC ground insulation impedance detection network, add ground insulation impedance detection network respectively at AC A, B, C three-phase, detect A phase-to-ground voltage V
a-PE, B phase-to-ground voltage V
b-PE, C phase-to-ground voltage V
c-PEwaveform.As shown in Figure 8, after there is cell panel positive/negative ground connection (being the situation of minus earth in figure), AC detection waveform changes Cleaning Principle.
Concrete determining step is as follows.In Fig. 9 ~ 11, Y value is depending on real voltage.
1, under normal circumstances, V
a-PE, V
b-PE, V
c-PEas shown in Figure 9, its detection waveform is of ac to waveform.Its detect effective value neglect greatly inverter export and determine, if inverter line voltage effective value is 315V, then its interchange detected over the ground effective value be 315/1.732=181.87V, other output systems by that analogy.
2, when after the minus earth of generation PV side, now the AC voltage-to-ground waveform that detects of AC is by the change occurred as shown in Figure 10 (if plus earth its change in the opposite direction): by series 1 waveform of Fig. 9, be changed to waveform shown in series 2 or series 3, concrete waveform will see the ripple control method that inverter is concrete, and it detects effective value and will change into:
wherein V
dcfor DC component ,-V
pV/ 2≤V
dc≤ V
pV/ 2, V
iNV-BUSNfor inversion exports inverter bus mid-point voltage.
3, sample after the AC voltage-to-ground waveform after minus earth, by data processing, DC component V wherein in can extracting
dcas shown in figure 11.V
dcactual numerical value is relevant to PV voltage, plus earth its be negative value.
After obtaining above-mentioned data, can analyze as follows:
If 1 V
dc≈ 0, then not there is earth fault in PV side.
If 2 0<abs (V
dc) <V
pV/ 2, then there is impedance earth (namely by certain impedance earth, concrete numerical value is depending on impedance ground and ground insulation impedance detection network impedance value) in PV side.
If 3 abs (V
dc) ≈ V
pV/ 2, then there is DC side ground connection, V
dcvalue is just, be then PV side minus earth, V
dcvalue is negative, be then PV side plus earth.
The AC Grounding of said method judges at this patent, scope not to be discussed, and repeats no more herein.
Claims (5)
1. detected the method on inverter ac side joint ground by single input ground insulation impedance detection network, it is characterized in that: only add ground insulation impedance detection network at solar battery input side, detect DC side solar battery positive pole voltage-to-ground V
pV+PEwith negative pole voltage-to-ground V
pV-PEwaveform; Under normal circumstances, detection waveform is DC quantity; When after generation AC ground connection, the waveform that now DC side detects will be changed into: abs (V
pV+PE)=abs (V
pV-PE)=V
pV/ 2+V
iNV-BUSN, wherein V
pVfor the voltage between DC side solar battery both positive and negative polarity, V
iNV-BUSNfor inverter exports inverter bus mid-point voltage; The AC compounent extracted in waveform judges AC Grounding.
2. detected the method on inverter ac side joint ground as claimed in claim 1 by single input ground insulation impedance detection network, it is characterized in that, if extract described AC compounent close to 0, then judge that AC earth fault does not occur, if close to V
out/ 1.732, V
outfor inverter output line voltage effective value, then judge AC generation dead ground fault, if between 0 and V
outbetween/1.732, then judge AC generation impedance earth.
3. the method for inverter direct-flow side ground connection is detected by single AC earth insulation impedance Sampling network, it is characterized in that: only add ground insulation impedance detection network at inverter ac outgoing side, add ground insulation impedance detection network respectively at AC A, B, C three-phase, detect A phase-to-ground voltage V
a-PE, B phase-to-ground voltage V
b-PE, C phase-to-ground voltage V
c-PEwaveform; Under normal circumstances, detection waveform is of ac; When after generation DC side minus earth, the AC voltage-to-ground waveform that now AC detects will change, and it detects effective value and will change into: V
a-PE=V
b-PE=V
c-PE=V
dc+ V
iNV-BUSN, wherein V
dcfor DC component ,-V
pV/ 2≤V
dc≤ V
pV/ 2, V
pVfor the voltage between DC side solar battery both positive and negative polarity, V
iNV-BUSNfor inversion exports inverter bus mid-point voltage; Extract the DC component V in waveform
dcjudge DC side Grounding.
4. detected the method for inverter direct-flow side ground connection as claimed in claim 3 by single AC earth insulation impedance Sampling network, it is characterized in that, extract described DC component V
dcif close to 0, then judge that DC side earth fault does not occur; If the absolute value of DC component is close to V
pV/ 2, then judge DC side generation dead ground fault; If the absolute value of DC component is between 0 and V
pVbetween/2, then judge DC side generation impedance earth.
5. detected the method for inverter direct-flow side ground connection as claimed in claim 3 by single AC earth insulation impedance Sampling network, it is characterized in that, described direct current component value is just, then represent DC side minus earth, it is negative for being worth, then represent DC side plus earth.
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| CN106301202A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of solar photovoltaic inverter |
| CN108429240A (en) * | 2018-05-07 | 2018-08-21 | 苏州市万松电气有限公司 | The ground protection circuit and inverter circuit of inverter |
| CN109406977A (en) * | 2018-11-13 | 2019-03-01 | 深圳威迈斯电源有限公司 | A kind of two-way Vehicular charger insulation detecting circuit and its detection method |
| CN109565259A (en) * | 2016-08-17 | 2019-04-02 | 艾思玛太阳能技术股份公司 | Isolating device for photovoltaic string |
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| CN110708016A (en) * | 2019-10-22 | 2020-01-17 | 阳光电源股份有限公司 | Method and device for monitoring insulation performance of photovoltaic grid-connected power generation system |
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| CN109782129B (en) * | 2019-01-24 | 2024-05-10 | 中国铁道科学研究院集团有限公司 | Ground fault point positioning method and device for rail transit traction auxiliary converter |
| US11500001B2 (en) | 2019-07-26 | 2022-11-15 | Huawei Digital Power Technologies Co., Ltd. | Insulation resistance detection circuit and method |
| CN110426601A (en) * | 2019-08-22 | 2019-11-08 | 金华电力设计院有限公司 | A kind of Fault Locating Method of earth-free photovoltaic system |
| CN110618359A (en) * | 2019-09-27 | 2019-12-27 | 合肥阳光电动力科技有限公司 | Alternating current insulation detection device and method for power driving system and power driving system |
| CN110708016A (en) * | 2019-10-22 | 2020-01-17 | 阳光电源股份有限公司 | Method and device for monitoring insulation performance of photovoltaic grid-connected power generation system |
| CN110708016B (en) * | 2019-10-22 | 2023-02-03 | 阳光电源股份有限公司 | Method and device for monitoring insulation performance of photovoltaic grid-connected power generation system |
| CN111398856A (en) * | 2020-04-17 | 2020-07-10 | 江苏吉泰科电气股份有限公司 | Quick accurate insulation detection circuit |
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