CN102611344A - Inverter circuit device for photovoltaic electricity generation - Google Patents
Inverter circuit device for photovoltaic electricity generation Download PDFInfo
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- CN102611344A CN102611344A CN2012100750348A CN201210075034A CN102611344A CN 102611344 A CN102611344 A CN 102611344A CN 2012100750348 A CN2012100750348 A CN 2012100750348A CN 201210075034 A CN201210075034 A CN 201210075034A CN 102611344 A CN102611344 A CN 102611344A
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Abstract
The invention discloses an inverter circuit device for photovoltaic electricity generation. The inverter circuit device comprises a direct current part and an inverter circuit part, wherein the direct current part comprises a solar panel and a direct current capacitor, and the inverter circuit part comprises six controlled switch devices, wherein the first controlled switch device, the fifth controlled switch device and the third controlled switch device are connected in series, the second controlled switch device, the sixth controlled switch device and the fourth controlled switch device are connected in series, the upper end of the first controlled switch device is connected with the upper end of the direct current capacitor, the lower end of the third controlled switch device is connected with the lower end of the direct current capacitor, the upper end of the second controlled switch device is connected with the upper end of the first controlled switch device, the lower end of the fourth controlled switch device is connected with the lower end of the third controlled switch device, the upper end of the third controlled switch device is connected with the upper end of the fourth controlled switch device; the inverter circuit device also comprises six diodes, a first inductor and a second inductor, the six diodes are respectively and reversely connected in parallel with two ends of the six controlled switch devices, the first inductor is connected with the first controlled switch device and an electric network, and the second inductor is connected with the second controlled switch device and the electric network. The inverter circuit device has the advantages that the common mode current is inhibited, the electromagnetic volume (EMV) problem is reduced, and the conversion efficiency is improved.
Description
Technical field
the invention belongs to the solar energy generation technology field, more particularly, relate to a kind of photovoltaic generation of converting direct-current voltage into alternating-current voltage function of realizing and use the inverter circuit device.
Background technology
solar energy is a kind of clean energy resource, renewable resource; In the epoch of rapid economic development; The energy problem of global range was outstanding more originally, and economic sustainable development necessarily requires to develop seeks the new energy, and the development of new energy technology more and more receives publicity.Photovoltaic generation and wind power generation are emerging in recent years new forms of energy industries; Wherein wind power generation receives certain region restriction; And photovoltaic generation does not have this restriction; So using the parallel network power generation technology on a large scale is a kind of mode of utilizing of effective new forms of energy, therefore, interconnection technology is the key technology in the photovoltaic generation.The present structure of the photovoltaic combining inverter full bridge inverter of mainly sampling, but this circuit produces high frequency voltage in the solar panel dc terminal; And because the laying area of solar cell is very big, and there are parasitic capacitance in solar panel and the earth, and area is big more, and this parasitic capacitance is big more, finally can produce the very big leakage current of common mode over the ground.
Summary of the invention
the present invention seeks to: to the deficiency of the prior art of mentioning in the background technology; And provide a kind of photovoltaic generation to use the inverter circuit device; This circuit arrangement can effectively avoid the solar panel dc terminal to produce high frequency common mode voltage; And reduce the common mode leakage current that produces owing to the cell panel direct-to-ground capacitance and reduce the EMV problem, improve the efficient of direct voltage conversion alternating voltage simultaneously.
Technical scheme of the present invention is: a kind of photovoltaic generation is used the inverter circuit device; Comprise DC circuit module and inverter circuit module two parts; Wherein the DC circuit module comprises solar panel and is connected in parallel on the dc capacitor on the solar panel output circuit, and said inverter circuit module comprises:
Six controlled switch devices; The wherein said first controlled switch device, the 5th controlled switch device, the series connection of the 3rd controlled switch device; The second controlled switch device, the 6th controlled switch device, the series connection of the 4th controlled switch device; Terminate to the dc capacitor upper end on the first controlled switch device, terminate to the dc capacitor lower end under the 3rd controlled switch device, terminate to first controlled switch device upper end on the second controlled switch device; Terminate to the 3rd controlled switch device lower end under the 4th controlled switch device, terminate to the 4th controlled switch device upper end on the 3rd controlled switch device;
Also comprise the first, second, third, fourth, the 5th and the 6th totally six diodes respectively corresponding inverse parallel in the above-mentioned the first, second, third, fourth, the 5th and the 6th these six controlled switch device two ends;
also comprise first inductance and second inductance; The left end of said first inductance is received the lower end of the first controlled switch device; The right-hand member of first inductance is received the electrical network upper end; The left end of second inductance is received the lower end of the second controlled switch device, and the right-hand member of second inductance is received the electrical network lower end.
Further selection for said controlled switch device among the present invention is following:
are preferred; The said first controlled switch device, the second controlled switch device, the 3rd controlled switch device, the 4th controlled switch device adopt the MOSFET of same model; The 5th controlled switch device and the 6th controlled switch device adopt the IGBT of same model, and six antiparallel diodes are parasitic diodes of six controlled switch devices.
are more preferred, and said the 5th diode and the 6th diode are the fast low conduction voltage drop diodes that recovers.
are preferred; Said first controlled switch device and the 4th controlled switch device are symmetrical switch; The second controlled switch device and the 3rd controlled switch device are symmetrical switch, and the 5th controlled switch device and the 6th controlled switch device are complementary switchs.
are preferred, and said first controlled switch device and the 4th controlled switch device are HF switches, and the employing switching frequency is 20KHZ, and the second controlled switch device and the 3rd controlled switch device are HF switches, adopt switching frequency 20KHz; And the drive signal of wherein said first controlled switch device and the 4th controlled switch device is same signal or the identical drive signal of action effect, and the drive signal of the second controlled switch device and the 3rd controlled switch device is same signal or the identical drive signal of action effect; The 5th controlled switch device and the 6th controlled switch device are the power frequency switch, and adopting mains frequency is the switch of 50Hz or 60Hz.
Advantage of the present invention is:
this photovoltaic generation provided by the invention is used the inverter circuit device, and its main purpose is that the direct current piezoelectricity with solar panel converts alternating voltage to, and realizes being incorporated into the power networks.Compare existing similar technology; Circuit arrangement of the present invention can effectively avoid the solar panel dc terminal to produce high frequency common mode voltage in practical application; And reduce the common mode leakage current that produces owing to the cell panel direct-to-ground capacitance and reduce the EMV problem, can improve the efficient of direct voltage conversion alternating voltage simultaneously.In addition, the structural elements device of circuit arrangement of the present invention is less relatively, and cost is lower, and the market competitiveness is also stronger.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Fig. 1 is the electrical block diagram of a kind of specific embodiment of the present invention;
Fig. 2 for the present invention at the current path figure of line voltage positive half period high-frequency driving signal when being high;
Fig. 3 for the present invention at the current path figure of line voltage positive half period high-frequency driving signal when low;
Fig. 4 for the present invention at the current path figure of line voltage negative half-cycle high-frequency driving signal when being high;
Fig. 5 for the present invention at the current path figure of line voltage negative half-cycle high-frequency driving signal when low;
Fig. 6 is the drive signal figure of the first controlled switch device, the 4th controlled switch device, the 6th controlled switch device;
Fig. 7 is the drive signal expanded view of the first controlled switch device, the 4th controlled switch device, the 6th controlled switch device;
Fig. 8 is the drive signal figure of the second controlled switch device, the 3rd controlled switch device, the 5th controlled switch device;
Fig. 9 is the drive signal expanded view of the second controlled switch device, the 3rd controlled switch device, the 5th controlled switch device;
The current/voltage simulation waveform figure of
Figure 10 during for operate as normal of the present invention.
Embodiment
Embodiment: combination Fig. 1-shown in Figure 5; The invention provides a kind of photovoltaic generation and use the inverter circuit device; It is made up of DC circuit module 1 and inverter circuit module two parts 2; Wherein DC circuit module 1 is made up of with the dc capacitor C that is connected in parallel on the solar panel output circuit solar panel, and being constructed as follows of said inverter circuit module 2:
First to the 6th totally six controlled switch device Q1-Q6; The wherein said first controlled switch device Q1, the 5th controlled switch device Q5, the 3rd controlled switch device Q3 series connection; The second controlled switch device Q2, the 6th controlled switch device Q6, the 4th controlled switch device Q4 series connection; Terminate to dc capacitor C upper end on the first controlled switch device Q1, terminate to dc capacitor C lower end under the 3rd controlled switch device Q3, terminate to first controlled switch device Q1 upper end on the second controlled switch device Q2; Terminate to the 3rd controlled switch device Q3 lower end under the 4th controlled switch device Q4, terminate to the 4th controlled switch device Q4 upper end on the 3rd controlled switch device Q3;
First to the 6th totally six diode D1-D6 respectively corresponding inverse parallel in above-mentioned first to the 6th these six controlled switch device Q1-Q6 two ends;
The first controlled switch device Q1 described in
present embodiment, the second controlled switch device Q2, the 3rd controlled switch device Q3, the 4th controlled switch device Q4 adopt the MOSFET of same model; The 5th controlled switch device Q5 and the 6th controlled switch device Q6 adopt the IGBT of same model, and six antiparallel diodes are parasitic diodes of six controlled switch devices.And wherein said the 5th diode D5 and the 6th diode D6 are the fast low conduction voltage drop diodes that recovers.
The first controlled switch device Q1 and the 4th controlled switch device Q4 are symmetrical switch described in
present embodiment; The second controlled switch device Q2 and the 3rd controlled switch device Q3 are symmetrical switch, and the 5th controlled switch device Q5 and the 6th controlled switch device Q6 are complementary switchs.
The first controlled switch device Q1 and the 4th controlled switch device Q4 are HF switches described in
present embodiment; The employing switching frequency is 20KHZ; The second controlled switch device Q2 and the 3rd controlled switch device Q3 are HF switches, adopt switching frequency 20KHz; And the drive signal of wherein said first controlled switch device Q1 and the 4th controlled switch device Q4 is same signal or the identical drive signal of action effect, and the drive signal of the second controlled switch device Q2 and the 3rd controlled switch device Q3 is same signal or the identical drive signal of action effect; The 5th controlled switch device Q5 and the 6th controlled switch device Q6 are the power frequency switch, and adopting mains frequency is the switch of 50Hz or 60Hz.
In conjunction with Fig. 2-shown in Figure 10, detailed operation process of the present invention is following:
that is to say that line voltage is correct time when line voltage is positioned at positive half period, the first controlled switch device Q1 is driven by the drive pulse signal of 20KHz; When drive signal when being high; The first controlled switch device Q1 conducting, the 4th controlled switch device Q4 is driven by the drive pulse signal of 20KHz, when drive signal when being high; The 4th controlled switch device Q4 conducting, first opens controlled pass device Q1 and the 4th controlled switch device Q4 conducting simultaneously.The 6th controlled switch device Q6 is the drive in correct time by line voltage; When line voltage is correct time; The 6th controlled switch device Q6 conducting always, drive signal such as Fig. 6 and shown in Figure 7 of the said first controlled switch device Q1, the 4th controlled switch device Q4 and the 6th controlled switch device Q6.At this moment the dc output end of solar panel is successively through the first controlled switch device Q1, first inductance L 1, electrical network, second inductance L 2, the 6th controlled switch device Q6, the 4th controlled switch device Q4, arrive solar panel direct-flow input end formation current path again, and is as shown in Figure 2.When line voltage still is positioned at positive half period; That is to say that line voltage is correct time; When the drive signal of the first controlled switch device Q1 was low, the first controlled switch device Q1 turn-offed, when the drive signal of the 4th controlled switch device Q4 is low; The 4th controlled switch device Q4 turn-offs; The 6th controlled switch device Q6 keeps conducting, and at this moment electric current arrive electrical network formation current path through first inductance L 1, electrical network, second inductance L 2, the 6th controlled switch device Q6, the 5th diode D5 successively again, and is as shown in Figure 3.
that is to say that the second controlled switch device Q2 was driven by the drive pulse signal of 20KHz when line voltage was negative when line voltage is positioned at negative half-cycle; When drive signal when being high; The second controlled switch device Q2 conducting, the 3rd controlled switch device Q3 is driven by the drive pulse signal of 20KHz, when drive signal when being high; The 3rd controlled switch device Q3 conducting, the second controlled switch device Q2 and the 3rd controlled switch device Q3 conducting simultaneously.Drive when the 5th controlled switch device Q5 is negative by line voltage; When line voltage when negative; The 5th controlled switch device Q5 conducting always, drive signal such as Fig. 8 and shown in Figure 9 of the said second controlled switch device Q2, the 3rd controlled switch device Q3 and the 5th controlled switch device Q5.At this moment the solar panel dc output end is successively through the second controlled switch device Q2, second inductance L 2, electrical network, first inductance L 1, the 5th controlled switch device Q5, the 3rd controlled switch device Q3, arrive solar panel direct-flow input end formation current path again, and is as shown in Figure 4.When line voltage when still being positioned at negative half-cycle; That is to say when line voltage is negative; When the drive signal of the second controlled switch device Q2 was low, the second controlled switch device Q2 turn-offed, when the drive signal of the 3rd controlled switch device Q3 is low; The 3rd controlled switch device Q3 turn-offs; The 5th controlled switch device Q5 keeps conducting, and at this moment electric current arrive electrical network formation current path through second inductance L 2, electrical network or AC load, first inductance L 1, the 5th controlled switch device Q5, the 6th diode D6 successively again, and is as shown in Figure 5.Grid-connected current simulation waveform and grid simulation voltage waveform are shown in figure 10 during operate as normal.
are positioned at positive half period when line voltage, and HF switch is when turn-offing, and electric current constitutes the loop through the 6th controlled switch device Q6 and the 5th diode D5; When line voltage is positioned at negative half-cycle, HF switch is when turn-offing, and electric current constitutes the loop through the 5th controlled switch device Q5 and the 6th diode D6; And owing to the first controlled switch device Q1, the second controlled switch device Q2, the 3rd controlled switch device Q3, the 4th controlled switch device Q4 are same model switch; So the solar panel dc terminal can not produce the voltage of high frequency; Thereby suppressed common mode current; Reduce the EMV problem, improved conversion efficiency.
are certain, and the foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to let people can understand content of the present invention and implements according to this, can not limit protection scope of the present invention with this.The all spirit of main technical schemes is done according to the present invention equivalent transformation or modification all should be encompassed within protection scope of the present invention.
Claims (5)
1. a photovoltaic generation is used the inverter circuit device; Comprise DC circuit module (1) and inverter circuit module two parts (2); Wherein DC circuit module (1) comprises solar panel and is connected in parallel on the dc capacitor (C) on the solar panel output circuit, and said inverter circuit module (2) comprising:
Six controlled switch devices; The wherein said first controlled switch device (Q1), the 5th controlled switch device (Q5), the series connection of the 3rd controlled switch device (Q3); The second controlled switch device (Q2), the 6th controlled switch device (Q6), the series connection of the 4th controlled switch device (Q4); Terminate to dc capacitor (C) upper end on the first controlled switch device (Q1); Terminate to dc capacitor (C) lower end under the 3rd controlled switch device (Q3); Terminate to the first controlled switch device (Q1) upper end on the second controlled switch device (Q2), terminate to the 3rd controlled switch device (Q3) lower end under the 4th controlled switch device (Q4), terminate to the 4th controlled switch device (Q4) upper end on the 3rd controlled switch device (Q3);
Also comprise the first, second, third, fourth, the 5th and the 6th totally six diodes (D1, D2, D3, D4, D5, D6) respectively corresponding inverse parallel in the above-mentioned the first, second, third, fourth, the 5th and the 6th these six controlled switch devices (Q1, Q2, Q3, Q4, Q5, Q6) two ends;
Also comprise first inductance (L1) and second inductance (L2); The left end of said first inductance (L1) is received the lower end of the first controlled switch device (Q1); The right-hand member of first inductance (L1) is received the electrical network upper end; The left end of second inductance (L2) is received the lower end of the second controlled switch device (Q2), and the right-hand member of second inductance (L2) is received the electrical network lower end.
2. photovoltaic generation according to claim 1 is used the inverter circuit device; It is characterized in that the said first controlled switch device (Q1), the second controlled switch device (Q2), the 3rd controlled switch device (Q3), the 4th controlled switch device (Q4) adopt the MOSFET of same model; The 5th controlled switch device (Q5) and the 6th controlled switch device (Q6) adopt the IGBT of same model, and six antiparallel diodes are parasitic diodes of six controlled switch devices.
3. photovoltaic generation according to claim 2 is used the inverter circuit device, it is characterized in that said the 5th diode (D5) and the 6th diode (D6) are the fast low conduction voltage drop diodes that recovers.
4. photovoltaic generation according to claim 1 is used the inverter circuit device; It is characterized in that said first controlled switch device (Q1) and the 4th controlled switch device (Q4) are symmetrical switch; The second controlled switch device (Q2) and the 3rd controlled switch device (Q3) are symmetrical switch, and the 5th controlled switch device (Q5) and the 6th controlled switch device (Q6) are complementary switchs.
5. photovoltaic generation according to claim 1 is used the inverter circuit device; It is characterized in that said first controlled switch device (Q1) and the 4th controlled switch device (Q4) are HF switches; The employing switching frequency is 20KHZ; The second controlled switch device (Q2) and the 3rd controlled switch device (Q3) are HF switches, adopt switching frequency 20KHz; And the drive signal of wherein said first controlled switch device (Q1) and the 4th controlled switch device (Q4) is same signal or the identical drive signal of action effect, and the drive signal of the second controlled switch device (Q2) and the 3rd controlled switch device (Q3) is same signal or the identical drive signal of action effect; The 5th controlled switch device (Q5) and the 6th controlled switch device (Q6) are the power frequency switch, and adopting mains frequency is the switch of 50Hz or 60Hz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100750348A CN102611344A (en) | 2012-03-21 | 2012-03-21 | Inverter circuit device for photovoltaic electricity generation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100750348A CN102611344A (en) | 2012-03-21 | 2012-03-21 | Inverter circuit device for photovoltaic electricity generation |
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| CN102611344A true CN102611344A (en) | 2012-07-25 |
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| CN2012100750348A Pending CN102611344A (en) | 2012-03-21 | 2012-03-21 | Inverter circuit device for photovoltaic electricity generation |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202004681U (en) * | 2011-03-31 | 2011-10-05 | 上海美科新能源股份有限公司 | Topological structure of photovoltaic grid-connected inverter |
| CN202121519U (en) * | 2011-03-02 | 2012-01-18 | 深圳格瑞特新能源有限公司 | Efficient inverter with direct current electromagnetic interference resistance |
| CN202495885U (en) * | 2012-03-21 | 2012-10-17 | 苏州欧姆尼克新能源科技有限公司 | Inverter circuit device for photovoltaic power generation |
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2012
- 2012-03-21 CN CN2012100750348A patent/CN102611344A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202121519U (en) * | 2011-03-02 | 2012-01-18 | 深圳格瑞特新能源有限公司 | Efficient inverter with direct current electromagnetic interference resistance |
| CN202004681U (en) * | 2011-03-31 | 2011-10-05 | 上海美科新能源股份有限公司 | Topological structure of photovoltaic grid-connected inverter |
| CN202495885U (en) * | 2012-03-21 | 2012-10-17 | 苏州欧姆尼克新能源科技有限公司 | Inverter circuit device for photovoltaic power generation |
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Application publication date: 20120725 |