CN203929851U - A kind of proving installation that detects photovoltaic combining inverter aftercurrent - Google Patents
A kind of proving installation that detects photovoltaic combining inverter aftercurrent Download PDFInfo
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- CN203929851U CN203929851U CN201420296232.1U CN201420296232U CN203929851U CN 203929851 U CN203929851 U CN 203929851U CN 201420296232 U CN201420296232 U CN 201420296232U CN 203929851 U CN203929851 U CN 203929851U
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- 238000009434 installation Methods 0.000 title claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 84
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- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 8
- 238000004088 simulation Methods 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
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Abstract
The utility model provides a kind of proving installation that detects photovoltaic combining inverter aftercurrent, it is characterized in that: outwards lead at least three test ports, be respectively test port one, test port two and test port three, each test port by a relay, disconnects respectively after being connected with equipment under test and realization cut-off and conducting are controlled in adhesive, test port one is connected with inverter pickup current measuring unit, test port two is connected with aftercurrent test cell, test port three and the inverter leakage current measurement unit that catches fire is connected, the all relays identical with test port quantity, inverter pickup current measuring unit, aftercurrent test cell and the inverter leakage current measurement unit that catches fire is all connected with identifying unit, identifying unit connects man-machine interaction unit.The utility model test event is perfect; Measuring accuracy is high; The efficiency of test is high.
Description
Technical field
The utility model relates to a kind of control survey system, for the detection of photovoltaic DC-to-AC converter aftercurrent.
Background technology
For photovoltaic array grid-connected system, non-isolated photovoltaic grid-connected inverter is used widely because of its relatively higher conversion efficiency and power density and lower cost.But due in this application mode between photovoltaic array and electrical network without electrical isolation; make the distributed capacitance existing between photovoltaic array and the earth under inverter HF switch mode of operation, to produce leakage current; thereby increased potential safety hazard; in fact the protection of leakage current is not only for non-isolation type inverter; isolation type grid-connected inverter is also had to identical requirement; but a kind of situation of the leakage current that the protection of aftercurrent produces for non-isolated grid-connected inverter specially, the leakage current producing when the size of aftercurrent is generally normally worked considerably beyond inverter.In order to reach the aftercurrent protection requirement of standard regulation, in non-isolation type photovoltaic DC-to-AC converter aftercurrent protection design, the sampling of aftercurrent, detection and computing method are particularly crucial.
The detection of square formation aftercurrent is to guarantee the safe and reliable important leverage of photovoltaic DC-to-AC converter.For the detection of square formation aftercurrent, first test pickup current and the leakage current that catches fire; Pickup current is used the test network of simulation human body impedance; The leakage current that catches fire is used multimeter directly to measure electric current between PV input end and ground; If the pickup current recording and the leakage current that catches fire are greater than limit value requirement, can threaten personal safety, and when circuit is long neglected and in disrepair, aging or occur line fault and the larger leakage current that produces.When leakage current is excessive, fire accident.Therefore need to carry out aftercurrent detection.
Due to the relevant criterion or the standard that do not have for this testing apparatus, existing test macro has following defect:
1) can test event perfect not, can not possess test pickup current, continuously the response time test of aftercurrent and sudden change aftercurrent simultaneously.
2) test macro is generally the product of detection our factory production and researches and develops, and is not suitable for the product of other producers, and versatility is poor.
Summary of the invention
The purpose of this utility model is to provide can test a plurality of projects and the good testing apparatus for detection of photovoltaic combining inverter aftercurrent of versatility.
In order to achieve the above object, the technical solution of the utility model has been to provide a kind of proving installation that detects photovoltaic combining inverter aftercurrent, it is characterized in that: outwards lead at least three test ports, be respectively test port one, test port two and test port three, each test port by a relay, disconnects respectively after being connected with equipment under test and realization cut-off and conducting are controlled in adhesive, test port one is connected with inverter pickup current measuring unit, test port two is connected with aftercurrent test cell, test port three and the inverter leakage current measurement unit that catches fire is connected, the all relays identical with test port quantity, inverter pickup current measuring unit, aftercurrent test cell and the inverter leakage current measurement unit that catches fire is all connected with identifying unit, identifying unit connects man-machine interaction unit.
Preferably, described inverter pickup current measuring unit adopts human body simulation to measure network.
Preferably, described aftercurrent test cell comprises shunt circuit, voltage sensor and current sensor, connect with current sensor with voltage sensor parallel connection time in shunt circuit, this shunt circuit is formed in parallel by least one road impedance adjustment circuit and at least one road capacitance adjustment circuit, every road impedance adjustment circuit is comprised of the impedance regulating of connecting and impedance adjustment switch, and every road capacitance adjustment circuit is comprised of the regulating mechanism of capacitor of connecting and capacitance adjustment switch.
Preferably, the described inverter leakage current measurement unit that catches fire adopts bandwidth sampling unit, and the bandwidth of this bandwidth sampling unit is not less than 2kHz.
The utlity model has following advantage:
1) test event is perfect, can possess the ability of test pickup current, aftercurrent;
2) type of tested inverter device is wide, to single-phase, three-phase; The inverter of different electric pressures, different capacity all can be tested;
3) measuring accuracy is high, and output voltage of the present utility model, the whole error of indication of current signal are 0.5%, and timing error is 1%;
4) efficiency of test is high, and test event, can save the test duration of half simultaneously.
Accompanying drawing explanation
A kind of schematic diagram that detects the proving installation of photovoltaic combining inverter aftercurrent that Fig. 1 provides for the utility model.
Embodiment
For the utility model is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.
As shown in Figure 1, for the utility model provides a kind of proving installation that detects photovoltaic combining inverter aftercurrent, it outwards leads to three test ports, be respectively test port one A, test port two B and test port three C, each test port by a relay, disconnects respectively after being connected with equipment under test and realization cut-off and conducting are controlled in adhesive, test port one A is connected with inverter pickup current measuring unit, test port two B are connected with aftercurrent test cell, test port three C and the inverter leakage current measurement unit that catches fire is connected, the all relays identical with test port quantity, inverter pickup current measuring unit, aftercurrent test cell and the inverter leakage current measurement unit that catches fire is all connected with identifying unit, identifying unit connects man-machine interaction unit.
Inverter pickup current measuring unit adopts human body simulation to measure network, during test, test port one A is received respectively to inverter input terminal and ground, closed tested inverter alternating current-direct current side switch, during grid-connected inverters operation, by human body simulation, measure network measure pickup current.
Test port two B provide an aftercurrent test cell, gather the tested inverter data of various electric pressures, by monitor voltage adjust voluntarily measurement gear, this test macro can meet the photovoltaic DC-to-AC converter of various power sections, comprise shunt circuit, voltage sensor and current sensor, connect with current sensor with voltage sensor parallel connection time in shunt circuit, this shunt circuit is formed in parallel by two-way impedance adjustment circuit Ji Yi road capacitance adjustment circuit, every road impedance adjustment circuit is comprised of the impedance regulating of connecting and impedance adjustment switch, every road capacitance adjustment circuit is comprised of the regulating mechanism of capacitor of connecting and capacitance adjustment switch.
Test port two B comprise electric current, voltage model are gathered, and sampling adopts zero magnetic flux micro-transformer of current, and its linearity reaches 0.02%, and degree of accuracy reaches 0.05%.And set test parameter by knob, loaded impedance, capacitive reactance meet test request, analyze to gather and to measure response time continuous aftercurrent test and the sudden change aftercurrent test of leakage current when excessive.So the voltage range gathering in system meets the test of photovoltaic DC-to-AC converter electric pressure completely at 0-1200V.
When test port two B test continuous aftercurrent, test lead is received respectively to inverter input terminal and ground; regulating resistance is to maximum; make the aftercurrent value of showing demonstration be less than 300mA (while being greater than 30kVA; 10mA/kVA); after invertor operation; turn down gradually resistance value, the current value while recording the action of aftercurrent protective device.
During test port two B test sudden change aftercurrent, test lead is received respectively to inverter input terminal and ground, regulating resistance, makes the aftercurrent size of showing demonstration for 30mA, first disconnects adjustable resistance, more closed adjustable resistance switch, the record sudden change trip time.
The inverter leakage current measurement unit that catches fire adopts bandwidth sampling unit, and the bandwidth of this bandwidth sampling unit is not less than 2kHz.
Claims (4)
1. a proving installation that detects photovoltaic combining inverter aftercurrent, it is characterized in that: outwards lead at least three test ports, be respectively test port one (A), test port two (B) and test port three (C), each test port by a relay, disconnects respectively after being connected with equipment under test and realization cut-off and conducting are controlled in adhesive, test port one (A) is connected with inverter pickup current measuring unit, test port two (B) is connected with aftercurrent test cell, test port three (C) and the inverter leakage current measurement unit that catches fire is connected, the all relays identical with test port quantity, inverter pickup current measuring unit, aftercurrent test cell and the inverter leakage current measurement unit that catches fire is all connected with identifying unit, identifying unit connects man-machine interaction unit.
2. a kind of proving installation that detects photovoltaic combining inverter aftercurrent as claimed in claim 1, is characterized in that: described inverter pickup current measuring unit adopts human body simulation to measure network.
3. a kind of proving installation that detects photovoltaic combining inverter aftercurrent as claimed in claim 1, it is characterized in that: described aftercurrent test cell comprises shunt circuit, voltage sensor and current sensor, connect with current sensor with voltage sensor parallel connection time in shunt circuit, this shunt circuit is formed in parallel by least one road impedance adjustment circuit and at least one road capacitance adjustment circuit, every road impedance adjustment circuit is comprised of the impedance regulating of connecting and impedance adjustment switch, every road capacitance adjustment circuit is comprised of the regulating mechanism of capacitor of connecting and capacitance adjustment switch.
4. a kind of proving installation that detects photovoltaic combining inverter aftercurrent as claimed in claim 1, is characterized in that: the described inverter leakage current measurement unit that catches fire adopts bandwidth sampling unit, and the bandwidth of this bandwidth sampling unit is not less than 2kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420296232.1U CN203929851U (en) | 2014-06-05 | 2014-06-05 | A kind of proving installation that detects photovoltaic combining inverter aftercurrent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420296232.1U CN203929851U (en) | 2014-06-05 | 2014-06-05 | A kind of proving installation that detects photovoltaic combining inverter aftercurrent |
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| CN203929851U true CN203929851U (en) | 2014-11-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445590A (en) * | 2015-12-16 | 2016-03-30 | 中能易电新能源技术有限公司 | Photovoltaic inverter leakage current protection motion automatic testing device |
| CN111141940A (en) * | 2020-02-18 | 2020-05-12 | 工业和信息化部威海电子信息技术综合研究中心 | Test circuit |
-
2014
- 2014-06-05 CN CN201420296232.1U patent/CN203929851U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445590A (en) * | 2015-12-16 | 2016-03-30 | 中能易电新能源技术有限公司 | Photovoltaic inverter leakage current protection motion automatic testing device |
| CN111141940A (en) * | 2020-02-18 | 2020-05-12 | 工业和信息化部威海电子信息技术综合研究中心 | Test circuit |
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Granted publication date: 20141105 |
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| CX01 | Expiry of patent term |