CN105577010B - The auxiliary electric circuit of pressure and control method in photovoltaic DC-to-AC converter - Google Patents
The auxiliary electric circuit of pressure and control method in photovoltaic DC-to-AC converter Download PDFInfo
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- CN105577010B CN105577010B CN201511018183.0A CN201511018183A CN105577010B CN 105577010 B CN105577010 B CN 105577010B CN 201511018183 A CN201511018183 A CN 201511018183A CN 105577010 B CN105577010 B CN 105577010B
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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
Abstract
The invention discloses the auxiliary electric circuit of the pressure in photovoltaic DC-to-AC converter and control methods.Including two switching tubes, two clamp diodes, two freewheeling diodes, two output diodes, two clamping capacitances, one times of voltage capacitance, there are two the coupling inductances of winding for two output capacitances and two bands, the present invention is expanded the voltage gain of converter using coupling inductance and reduces the voltage stress of power switch tube and diode, the zero current turning-on of switching tube is realized using the leakage inductance of coupling inductance and inhibits the reverse recovery current of diode, the clamp circuit of clamp diode and clamping capacitance composition effectively absorbs due to voltage spikes when main switch turns off and realizes the lossless transfer of energy, the gain of converter is further improved using voltage-multiplying circuit, and further decrease the voltage stress of power switch tube and output diode, circuit control is convenient, input current ripple is small, suitable for relatively high power, high-gain and efficiently The parallel network power generation of rate converts occasion.
Description
Technical field
The present invention relates to a kind of DC-to-DC converter and its control methods.
Background technique
In solar power system, three-level inverter and its parallel technology are widely applied, with two electricity of tradition
Flat inverter is compared, and three-level inverter output power quality is good, and required filter is small in size, and Simultaneous Switching loss is low, effectively
Reduce the cost and volume of system.It is as shown in Figure 1 T-type tri-level circuit.
And the inverter of wired in parallel mode is used, on the one hand improve grid power quality, another aspect lifting system effect
Rate.Simultaneously using the module control means of intelligence, automatically with making module put into or cut out working condition, dynamic regulation work according to operating condition
The module number of work makes inverter always work in efficient best operating point, extends the working time of inverter.When especially
Redundant Control is automatically stopped and cuts out the malfunctioning module when a certain module breaks down, and makes it to systematic influence minimum, greatly
The reliability of width lifting system.
The input of tri-level circuit is divided into positive and negative busbar, in system or control parameter asymmetry, positive and negative busbar voltage meeting
It is unbalanced, influence the control and performance of system.It is asked although single inverter can solve busbar voltage unevenness by modulator approach
Topic, but inverter parallel performance can be had an impact.Therefore busbar voltage is solved not often through the method for introducing balancing circuitry
Voltage-sharing (switching tube Su, Sd and inductance L).
The accessory power supply of photovoltaic DC-to-AC converter generally from photovoltaic electricity side-draw, is formed needed for control circuit by flyback converter
Low-voltage.The system voltage of photovoltaic is 1000V, therefore it is the switching tube of 1500V that the switching tube of flyback converter, which will select pressure resistance,
Characteristic difference is at high cost.
Summary of the invention
The present invention will overcome the disadvantages mentioned above of the prior art, provide a kind of structure and simply press auxiliary electric circuit and controlling party
Method, structure is simply easy to control, while realizing pressing for bus capacitor and exporting with stablizing for accessory power supply.
In the auxiliary electric circuit of pressure in photovoltaic DC-to-AC converter of the present invention, the positive grade of two pipe D1 of the first counnter attack and first defeated
The first end for entering capacitor C1 is connected, and the first end of the first winding of transformer L1 is connected with the cathode of the first counnter attack diode D1, the
The second end of one winding L1 is connected with the drain of first switch tube S1, the source electrode of first switch tube S1 and the first input capacitance C1's
The positive grade of second end, the first end of the second input capacitance C2 and the second counnter attack diode D2 is connected, the second winding of transformer L2's
First end is connected with the cathode of the second counnter attack diode D2, the second end and the drain phase of second switch S2 of the second winding L2
Even, the source electrode of second switch S2 is connected with the second end of the second input capacitance C2, and Vin1 is the voltage of the first input capacitance C1,
Vin2 is the voltage of the second input capacitance C2, and Dr1 and Dr2 are respectively that the driving of first switch tube S1 and second switch S2 is believed
Number.
The first end of transformer tertiary winding L3 is connected with the anode of output diode Do, the cathode of output diode Do with
The first end of output capacitance Co and the first end of load resistance Ro are connected, the second end and the transformer tertiary winding of output capacitance Co
The second end of L3 and the second end of load resistance Ro are connected, and Vout is the voltage that Co is held in transmission of electricity.
The first end of the first winding of transformer L1 and the first end of the second winding L2 and the second end of tertiary winding L3 are same
Name end.
The control method for pressing switching tube in auxiliary electric circuit, it is characterised in that:
When the difference of Vin1 and Vin2 is less than threshold values VF, first switch tube and second switch are worked together, Dr1 with
Dr2 is exported simultaneously.
When Vin1 is greater than Vin2, and their difference is greater than threshold values VF, the driving signal Dr2 duty of second switch
Than being decreased to 0.
When Vin1 is less than Vin2, and their difference is greater than threshold values VF, the driving signal Dr1 duty of first switch tube
Than being decreased to 0.
The reduction of duty ratio does not influence the stabilization of accessory power supply output voltage Vout.
The present invention only passes through a tool, and there are three the transformers of winding, form the circuit of reversed excitation of primary side cascaded structure, a side
Face reduces the voltage stress of auxiliary electric switch pipe, makes it possible on the other hand to pass through auxiliary using the switching tube of 900V pressure resistance
The pressure of busbar voltage is realized in the control of power supply.
The invention has the advantages that circuit is simple and reliable, accessory power supply and bus are only realized by one group of Switching Power Supply simultaneously
Two functions are pressed, cost and volume are saved.
Detailed description of the invention
Fig. 1 is the existing T-type three-level inverter with equalizer circuit
Fig. 2 is circuit diagram of the invention；
Specific embodiment
Referring to fig. 2, the auxiliary electric circuit of pressure and control method in photovoltaic DC-to-AC converter of the invention, comprising:
In the auxiliary electric circuit of pressure in photovoltaic DC-to-AC converter of the present invention, the positive grade of two pipe D1 of the first counnter attack and first defeated
The first end for entering capacitor C1 is connected, and the first end of the first winding of transformer L1 is connected with the cathode of the first counnter attack diode D1, the
The second end of one winding L1 is connected with the drain of first switch tube S1, the source electrode of first switch tube S1 and the first input capacitance C1's
The positive grade of second end, the first end of the second input capacitance C2 and the second counnter attack diode D2 is connected, the second winding of transformer L2's
First end is connected with the cathode of the second counnter attack diode D2, the second end and the drain phase of second switch S2 of the second winding L2
Even, the source electrode of second switch S2 is connected with the second end of the second input capacitance C2, and Vin1 is the voltage of the first input capacitance C1,
Vin2 is the voltage of the second input capacitance C2, and Dr1 and Dr2 are respectively that the driving of first switch tube S1 and second switch S2 is believed
Number.
The first end of transformer tertiary winding L3 is connected with the anode of output diode Do, the cathode of output diode Do with
The first end of output capacitance Co and the first end of load resistance Ro are connected, the second end and the transformer tertiary winding of output capacitance Co
The second end of L3 and the second end of load resistance Ro are connected, and Vout is the voltage that Co is held in transmission of electricity.
The first end of the first winding of transformer L1 and the first end of the second winding L2 and the second end of tertiary winding L3 are same
Name end.
The control method for pressing switching tube in auxiliary electric circuit, it is characterised in that:
When the difference of Vin1 and Vin2 is less than threshold values VF, first switch tube S1 and second switch S2 are worked together, Dr1
It is exported simultaneously with Dr2.
When Vin1 is greater than Vin2, and their difference is greater than threshold values VF, the driving signal Dr2 of second switch S2 is accounted for
Empty ratio is decreased to 0.
When Vin1 is less than Vin2, and their difference is greater than threshold values VF, the driving signal Dr1 of first switch tube S1 is accounted for
Empty ratio is decreased to 0.
The reduction of duty ratio does not influence the stabilization of accessory power supply output voltage Vout.
This circuit is combined with control method, and there are three types of working conditions: first switch tube S1 and the common work of second switch S2
Make situation；First switch tube S1 is worked normally, and second switch S2 duty ratio is decreased to zero working condition；Second switch S2 is just
Often work, first switch tube S1 duty ratio are decreased to zero working condition:
Situation is worked together in first switch tube S1 and second switch S2:
When the threshold values that the voltage Vin1 of the first input capacitance C1 is differed with the voltage Vin2 of the second input capacitance C2 is less than VF
When, at this time it is considered that busbar voltage is at equilibrium, without adjusting busbar voltage, first switch by pressure accessory power supply
Pipe S1 and second switch S2 exports same duty ratio D, when first switch tube S1 and second switch S2 are connected, to anti-
The charging of violent change depressor, when first switch tube S1 and second switch S2 are turned off, flyback transformer by output diode Do to
Output capacitance Co electric discharge.Since the number of turns of the first winding L1 and the second winding L2 are all n1, by first capacitor C1 and second
The energy that capacitor C2 is released is identical.The output voltage of accessory power supply can be adjusted by duty ratio.
First switch tube S1 is worked normally, and second switch S2 duty ratio is decreased to zero working condition:
When the voltage Vin1 of the first input capacitance C1 is greater than the voltage Vin2 of the second input capacitance C2, and the threshold values differed
When greater than VF, bus capacitor is in non-balanced state at this time, therefore is only provided needed for accessory power supply as the first input capacitance C1
Energy, the second input capacitance C2 do not provide auxiliary electric flux, to realize the adjusting pressed.When Vin1 becomes equal with Vin2,
The duty ratio of second switch S2 starts to export again, returns to two switching tubes and works together situation.
Second switch S2 is worked normally, and first switch tube S1 duty ratio is decreased to zero working condition:
As voltage Vin2 of the voltage Vin1 of the first input capacitance C1 less than the second input capacitance C2, and the threshold values differed
When greater than VF, bus capacitor is in non-balanced state at this time, therefore is only provided needed for accessory power supply as the second input capacitance C2
Energy, the first input capacitance C1 do not provide auxiliary electric flux, to realize the adjusting pressed.When Vin1 becomes equal with Vin2,
The duty ratio of first switch tube S1 starts to export again, returns to two switching tubes and works together situation.
In addition to this control method, two switching tubes can also be allowed to work alternatively, previous switch periods first switch tube S1 output,
Latter switch periods second switch S2 output, adjusts the duty ratio of two-way output respectively in such a mode, is guaranteeing that auxiliary electricity is defeated
Realize that busbar voltage is pressed in the case where voltage Vout stable out.
Claims (1)
1. the auxiliary electric circuit of pressure in a kind of photovoltaic DC-to-AC converter, it is characterised in that: in the auxiliary electric circuit of the pressure, the first counnter attack
The positive grade of two pipe D1 is connected with the first end of the first input capacitance C1, the first end and the first counnter attack two of the first winding of transformer L1
The cathode of pole pipe D1 is connected, and the second end of the first winding L1 is connected with the drain of first switch tube S1, the source of first switch tube S1
The positive grade phase of pole and the second end of the first input capacitance C1, the first end of the second input capacitance C2 and the second counnter attack diode D2
Even, the first end of the second winding of transformer L2 is connected with the cathode of the second counnter attack diode D2, the second end of the second winding L2 and
The drain of second switch S2 is connected, and the source electrode of second switch S2 is connected with the second end of the second input capacitance C2, and Vin1 is
The voltage of first input capacitance C1, Vin2 are the voltage of the second input capacitance C2, Dr1 and Dr2 be respectively first switch tube S1 with
The driving signal of second switch S2；
The first end of transformer tertiary winding L3 is connected with the anode of output diode Do, the cathode of output diode Do and output
The first end of capacitor Co and the first end of load resistance Ro are connected, and the second end of output capacitance Co is with transformer tertiary winding L3's
Second end and the second end of load resistance Ro are connected, and Vout is the voltage that Co is held in transmission of electricity；
The first end of the first winding of transformer L1 and the first end of the second winding L2 and the second end of tertiary winding L3 are Same Name of Ends；
When the difference of Vin1 and Vin2 is less than threshold values VF, first switch tube S1 and second switch S2 are worked together, Dr1 with
Dr2 is exported simultaneously；
When Vin1 is greater than Vin2, and their difference is greater than threshold values VF, the driving signal Dr2 duty ratio of second switch S2
It is decreased to 0；
When Vin1 is less than Vin2, and their difference is greater than threshold values VF, the driving signal Dr1 duty ratio of first switch tube S1
It is decreased to 0；
The reduction of duty ratio does not influence the stabilization of accessory power supply output voltage Vout.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511018183.0A CN105577010B (en) | 2015-12-30 | 2015-12-30 | The auxiliary electric circuit of pressure and control method in photovoltaic DC-to-AC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511018183.0A CN105577010B (en) | 2015-12-30 | 2015-12-30 | The auxiliary electric circuit of pressure and control method in photovoltaic DC-to-AC converter |
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| Publication Number | Publication Date |
|---|---|
| CN105577010A CN105577010A (en) | 2016-05-11 |
| CN105577010B true CN105577010B (en) | 2019-06-18 |
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| CN201511018183.0A Active CN105577010B (en) | 2015-12-30 | 2015-12-30 | The auxiliary electric circuit of pressure and control method in photovoltaic DC-to-AC converter |
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| CN109742927B (en) * | 2019-01-08 | 2024-03-08 | 南京麦格安倍电气科技有限公司 | Circuit for equalizing voltage and auxiliary power supply of bus capacitor of half-bridge power converter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610026A (en) * | 2008-06-18 | 2009-12-23 | 力博特公司 | A kind of protective circuit that is used for the balancing circuitry of supply convertor |
| CN203608089U (en) * | 2013-11-22 | 2014-05-21 | 广州金升阳科技有限公司 | Series circuit of converters |
| CN104218807A (en) * | 2014-08-22 | 2014-12-17 | 国家电网公司 | High-voltage-resistant switching power supply |
| CN204538960U (en) * | 2015-04-24 | 2015-08-05 | 深圳市易优电气有限公司 | Bus capacitor equalizer circuit |
| CN105048789A (en) * | 2015-08-20 | 2015-11-11 | 上海三环节能科技发展有限公司 | Voltage-sharing DC capacitor system for large-power frequency converter |
| CN205319965U (en) * | 2015-12-30 | 2016-06-15 | 杭州禾迈电力电子技术有限公司 | Circuit is assisted in voltage -sharing among photovoltaic inverter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6231900B2 (en) * | 2014-02-17 | 2017-11-15 | 株式会社ダイヘン | Photovoltaic power generation facility for grid connection |
-
2015
- 2015-12-30 CN CN201511018183.0A patent/CN105577010B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610026A (en) * | 2008-06-18 | 2009-12-23 | 力博特公司 | A kind of protective circuit that is used for the balancing circuitry of supply convertor |
| CN203608089U (en) * | 2013-11-22 | 2014-05-21 | 广州金升阳科技有限公司 | Series circuit of converters |
| CN104218807A (en) * | 2014-08-22 | 2014-12-17 | 国家电网公司 | High-voltage-resistant switching power supply |
| CN204538960U (en) * | 2015-04-24 | 2015-08-05 | 深圳市易优电气有限公司 | Bus capacitor equalizer circuit |
| CN105048789A (en) * | 2015-08-20 | 2015-11-11 | 上海三环节能科技发展有限公司 | Voltage-sharing DC capacitor system for large-power frequency converter |
| CN205319965U (en) * | 2015-12-30 | 2016-06-15 | 杭州禾迈电力电子技术有限公司 | Circuit is assisted in voltage -sharing among photovoltaic inverter |
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| CN105577010A (en) | 2016-05-11 |
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Address after: Hangzhou City, Zhejiang province 310015 Gongshu District Kang Road No. 18 building 11 floor Patentee after: Hangzhou Hemai Power Electronics Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310015 Gongshu District Kang Road No. 18 building 11 floor Patentee before: HOYMILES CONVERTER TECHNOLOGY Co.,Ltd. |
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