CN204030940U - A kind of active common mode noise suppressor that suppresses photovoltaic leakage current - Google Patents
A kind of active common mode noise suppressor that suppresses photovoltaic leakage current Download PDFInfo
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- CN204030940U CN204030940U CN201420454710.7U CN201420454710U CN204030940U CN 204030940 U CN204030940 U CN 204030940U CN 201420454710 U CN201420454710 U CN 201420454710U CN 204030940 U CN204030940 U CN 204030940U
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- capacitor
- triode
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- common
- common mode
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
An active common mode noise suppressor that suppresses photovoltaic leakage current, can suppress the leakage current that electrical network and filter inductance imbalance cause, and also has and suppresses the general utility functions that power device HF switch causes leakage current.This device by common-mode voltage Sampling network, common-mode voltage follow, network voltage detection network, line voltage is followed forms with common mode transformer five parts.Network voltage detection network detection of grid voltage, the common-mode voltage that common-mode voltage Sampling network detection means HF switch produces, by voltage follow, the former limit of the common mode transformer that is added to; Common mode transformer secondary seals in the outlet side of single-phase non-isolated inverter, realizes the counteracting of total common-mode voltage, reaches the object that suppresses photovoltaic inverter leakage current.Inverter output inductor L
a, L
bconventionally incomplete equilibrium, the utility model, by dc-link capacitance mid point O is connected to electrical network earth terminal, can suppress because of the uneven leakage current producing of filter inductance.
Description
Technical field
The utility model relates to the non-isolation single-phase grid-connected inverter of photovoltaic, is applicable to the drain current suppressing with the non-isolation single-phase grid-connected inverter of photovoltaic of uneven filter inductance.
Background technology
Non-isolation photovoltaic DC-to-AC converter does not adopt isolating transformer, have the advantage that volume, weight, cost, circuit complexity all reduce, and efficiency is higher.Yet, there is no transformer as electrical isolation, between photovoltaic array and ground connection framework, there is parasitic capacitance, formed a common mode loop with photovoltaic array, inverter, filter, electrical network and the earth.Along with the action of switch, common-mode voltage also can change with certain frequency and amplitude; The variation of common-mode voltage, causes the variation of inductance and capacitor charge and discharge state in common mode loop, in common mode loop, with regard to shape, has given birth to leakage current circulation.The existence of leakage current, can cause power network current distortion, electromagnetic interference, the extraneoas loss of system and potential safety hazard.There is leakage problem in non-isolation photovoltaic system, is the key problem in technology that needs solution.
Summary of the invention
The purpose of this utility model is the defect that overcomes prior art, and a kind of active common mode noise suppressor that suppresses photovoltaic leakage current is provided, and is applied to the non-isolation single-phase grid-connected inverter of photovoltaic with uneven inductance.
For achieving the above object, a kind of active common mode noise suppressor that suppresses photovoltaic leakage current, comprises network voltage detection network resistor R
1～R
5, capacitor C
1～C
5, triode T
1～T
4, three winding common mode transformer winding L
1～L
3, and power supply V
s1, V
s2;
Described network voltage detection network resistor R
1and resistance R
2be connected to the positive and negative two ends of electrical network 4, resistance R
1and resistance R
2the other end be connected respectively to capacitor C
1and capacitor C
2, capacitor C
1and capacitor C
2the other end be connected, its mid point is connected to triode T
1, triode T
2base stage, triode T
1emitter and triode T
2emitter be connected, be connected to the former limit L of three winding common mode transformers simultaneously
1non-same polarity, triode T
1collector electrode be connected to power supply V
s1positive terminal, triode T
2collector electrode be connected to power supply V
s2negative pole end;
Network voltage detection network resistor R3, resistance R 4 connect respectively output terminals A, the B of single-phase non-isolated inverter 2, resistance R
3, resistance R
4the other end be connected respectively to common-mode voltage Sampling network capacitor C
3, capacitor C
4, capacitor C
3and capacitor C
4the other end be connected, be connected to common-mode voltage Sampling network capacitor C simultaneously
5one end, capacitor C
5the other end be connected to resistance R
5, resistance R
5the other end be connected to dc-link capacitance C
11and capacitor C
12mid point O;
Described capacitor C
3, capacitor C
4and capacitor C
5tie point receive triode T
3, triode T
4base stage, triode T
3emitter and triode T
4emitter be connected, be connected to the former limit L of three winding common mode transformers simultaneously
1same Name of Ends, triode T
3collector electrode be connected to power supply V
s1positive terminal, triode T
2collector electrode be connected to power supply V
s2negative pole end;
Described power supply V
s1negative pole end and power supply V
s2positive terminal be connected, tie point is simultaneously and dc-link capacitance C
11and capacitor C
12the earth terminal of mid point O, electrical network 4 be connected; Secondary first winding L of common mode transformer
2be connected to the output terminals A of single-phase non-isolated inverter 2, secondary the first winding L
2the other end be connected to inverter output inductor L
a; Secondary second winding L of common mode transformer
3be connected to the output B of single-phase non-isolated inverter 2, secondary the second winding L
3the other end be connected to inverter output inductor L
b.
Network voltage detection network detection of grid voltage, by triode T
1, T
2the emitter follower forming is followed, and by common mode transformer, is amplified and is oppositely sealed in inverter output end, offsets a part of low frequency leakage current composition that line voltage produces; The high frequency common mode voltage that common-mode voltage Sampling network detection power translation circuit produces, by triode T
3, T
4the emitter follower forming is followed, and by common mode transformer, is amplified and is sealed in inverter output end, offsets high frequency common mode voltage; When output inductor is uneven, because the mid point of dc-link capacitance is connected with electrical network earth terminal, can absorb the leakage current composition producing because of inductance unbalance.Inverter 2 can be single-stage and-phase inverter, or the two-stage inverter structure that is connected with single-phase inverter of DC to DC converter.
The invention has the beneficial effects as follows: utilize active device to follow the line voltage detecting and common-mode voltage; by common mode transformer, induced voltage is sealed in to common mode loop; offset total common-mode voltage; can suppress the leakage current that electrical network and filter inductance imbalance cause, also have and suppress the general utility functions that power device HF switch causes leakage current.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model is applied to non-isolation photovoltaic single-phase grid-connected inverter.
Embodiment
A kind of active common mode noise suppressor that suppresses photovoltaic leakage current that is applied to non-isolation photovoltaic single-phase full bridge combining inverter, circuit, with reference to Fig. 1, comprises voltage detecting network resistor R
1～R
5, capacitor C
1～C
5, triode T
1～T
4, three winding common mode transformer winding L
1～L
3, and power supply V
s1, V
s2.Between photovoltaic array 1 and the earth, there is parasitic capacitance, use capacitor C
pv1, capacitor C
pv2represent, both capacitances equate; Capacitor C
11and capacitor C
12for dc-link capacitance, both capacitances equate; Inverter 2 can be single-stage and-phase inverter, or two-stage inverter structure; Inductance L
aand inductance L
bfor inverter output inductor, both inductance value equate in theory, but actual inductance value is often uneven; Electrical network 4 one end ground connection, earth point is 0.
Active common mode noise suppressor 3 is mainly comprised of two parts, and high frequency common mode voltage suppresses part and line voltage suppresses part.Voltage detecting network is comprised of resistance-capacitance network.Network voltage detection network resistor R
1and resistance R
2be connected to the positive and negative two ends of electrical network 4, resistance R
1and resistance R
2the other end be connected respectively to capacitor C
1and capacitor C
2, capacitor C
1and capacitor C
2the other end be connected, its mid point is connected to triode T
1, triode T
2base stage, triode T
1emitter and triode T
2emitter be connected, be connected to the former limit L of three winding common mode transformers simultaneously
1non-same polarity, triode T
1collector electrode be connected to power supply V
s1positive terminal, triode T
2collector electrode be connected to power supply V
s2negative pole end.Common-mode voltage Sampling network resistance R 3, resistance R 4 connect respectively output terminals A, the B of single-phase non-isolated inverter 2, resistance R
3, resistance R
4the other end be connected respectively to common-mode voltage Sampling network capacitor C
3, capacitor C
4, capacitor C
3and capacitor C
4the other end be connected, be connected to common-mode voltage Sampling network capacitor C simultaneously
5one end, capacitor C
5the other end be connected to resistance R
5, resistance R
5the other end be connected to dc-link capacitance C
11and capacitor C
12mid point O.Capacitor C
3, capacitor C
4and capacitor C
5tie point receive triode T
3, triode T
4base stage, triode T
3emitter and triode T
4emitter be connected, be connected to the former limit L of three winding common mode transformers simultaneously
1same Name of Ends, triode T
3collector electrode be connected to power supply V
s1positive terminal, triode T
2collector electrode be connected to power supply V
s2negative pole end.Power supply V
s1negative pole end and power supply V
s2positive terminal be connected, tie point is simultaneously and dc-link capacitance C
11and capacitor C
12the earth terminal of mid point O, electrical network 4 be connected.Secondary first winding L of common mode transformer
2be connected to the output terminals A of single-phase non-isolated inverter 2, secondary the first winding L
2the other end be connected to inverter output inductor L
a; Secondary second winding L of common mode transformer
3be connected to the output B of single-phase non-isolated inverter 2, secondary the second winding L
3the other end be connected to inverter output inductor L
b.
The former limit winding L of three winding common mode transformers
1, secondary the first winding L
2with secondary the second winding L
3the number of turn is identical,
N
1:N
2:N
3＝n:1:1
In formula, N
1it is former limit winding L
1the number of turn, N
2it is secondary the first winding L
2the number of turn, N
3it is secondary the second winding L
3the number of turn, n is the turn ratio of the former secondary winding of common mode transformer, generally, the turn ratio is less than 1.
The resistance R of network voltage detection network
1and resistance R
2pass be:
R
2:R
1＝n/(2-n)
The capacitor C of network voltage detection network
1and capacitor C
2pass be:
C
2:C
1＝(2-n)/n
The resistance R of common-mode voltage Sampling network
3and resistance R
4resistance equates, capacitor C
3and capacitor C
4capacitance equate.The resistance R of common-mode voltage Sampling network
5and resistance R
3, resistance R
4pass be:
R
5:R
4:R
3＝n/(2-2n):1:1
The capacitor C of common-mode voltage Sampling network
5and capacitor C
3, capacitor C
4pass be:
C
5:C
4:C
3＝(2-2n)/n:1:1
Leakage current i
ncan represent to become leakage current component, the leakage current component of grid voltage change generation and the leakage current component that inductance unbalance causes that common-mode voltage produces.
The common-mode voltage that power device HF switch produces, is detected by common-mode voltage Sampling network, through emitter follower, follows, and is added to one end, the former limit of common mode transformer; Line voltage detects dividing potential drop by network voltage detection network, through emitter follower, follows, and is added to the former limit of the common mode transformer other end.By common mode transformer secondary, seal in inverter output end, the voltage of generation and total common-mode voltage equal and opposite in direction, opposite direction, cancels each other, thereby suppresses leakage current.The leakage current component that inductance unbalance causes, cannot offset by common active common mode noise suppression network, and the mid point of dc-link capacitance is connected with electrical network earth terminal, and dc-link capacitance can absorb the leakage current composition producing because of inductance unbalance.
Claims (1)
1. an active common mode noise suppressor that suppresses photovoltaic leakage current, is characterized in that comprising: network voltage detection network resistor R
1～R
5, capacitor C
1～C
5, triode T
1～T
4, three winding common mode transformer winding L
1～L
3, and power supply V
s1, V
s2;
Described network voltage detection network resistor R
1and resistance R
2be connected to the positive and negative two ends of electrical network (4), resistance R
1and resistance R
2the other end be connected respectively to capacitor C
1and capacitor C
2, capacitor C
1and capacitor C
2the other end be connected, its mid point is connected to triode T
1, triode T
2base stage, triode T
1emitter and triode T
2emitter be connected, be connected to the former limit L of three winding common mode transformers simultaneously
1non-same polarity, triode T
1collector electrode be connected to power supply V
s1positive terminal, triode T
2collector electrode be connected to power supply V
s2negative pole end;
Network voltage detection network resistor R
3, resistance R
4the output terminals A, the B that connect respectively single-phase non-isolated inverter (2), resistance R
3, resistance R
4the other end be connected respectively to common-mode voltage Sampling network capacitor C
3, capacitor C
4, capacitor C
3and capacitor C
4the other end be connected, be connected to common-mode voltage Sampling network capacitor C simultaneously
5one end, capacitor C
5the other end be connected to resistance R
5, resistance R
5the other end be connected to dc-link capacitance C
11and capacitor C
12mid point O;
Described capacitor C
3, capacitor C
4and capacitor C
5tie point receive triode T
3, triode T
4base stage, triode T
3emitter and triode T
4emitter be connected, be connected to the former limit L of three winding common mode transformers simultaneously
1same Name of Ends, triode T
3collector electrode be connected to power supply V
s1positive terminal, triode T
2collector electrode be connected to power supply V
s2negative pole end;
Described power supply V
s1negative pole end and power supply V
s2positive terminal be connected, tie point is simultaneously and dc-link capacitance C
11and capacitor C
12the earth terminal of mid point O, electrical network (4) be connected; Secondary first winding L of common mode transformer
2be connected to the output terminals A of single-phase non-isolated inverter (2), secondary the first winding L
2the other end be connected to inverter output inductor L
a; Secondary second winding L of common mode transformer
3be connected to the output B of single-phase non-isolated inverter (2), secondary the second winding L
3the other end be connected to inverter output inductor L
b.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420454710.7U CN204030940U (en) | 2014-08-13 | 2014-08-13 | A kind of active common mode noise suppressor that suppresses photovoltaic leakage current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420454710.7U CN204030940U (en) | 2014-08-13 | 2014-08-13 | A kind of active common mode noise suppressor that suppresses photovoltaic leakage current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204030940U true CN204030940U (en) | 2014-12-17 |
Family
ID=52070765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420454710.7U Expired - Fee Related CN204030940U (en) | 2014-08-13 | 2014-08-13 | A kind of active common mode noise suppressor that suppresses photovoltaic leakage current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204030940U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582997A (en) * | 2020-11-02 | 2021-03-30 | 武汉华中数控股份有限公司 | Leakage suppression circuit and control method thereof |
-
2014
- 2014-08-13 CN CN201420454710.7U patent/CN204030940U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582997A (en) * | 2020-11-02 | 2021-03-30 | 武汉华中数控股份有限公司 | Leakage suppression circuit and control method thereof |
| CN112582997B (en) * | 2020-11-02 | 2023-03-10 | 武汉华中数控股份有限公司 | Electric leakage suppression circuit and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 Termination date: 20150813 |
|
| EXPY | Termination of patent right or utility model |