CN105515513A - Photovoltaic inverter and control method thereof - Google Patents
Photovoltaic inverter and control method thereof Download PDFInfo
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- CN105515513A CN105515513A CN201610073927.7A CN201610073927A CN105515513A CN 105515513 A CN105515513 A CN 105515513A CN 201610073927 A CN201610073927 A CN 201610073927A CN 105515513 A CN105515513 A CN 105515513A
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- 238000004146 energy storage Methods 0.000 claims abstract description 89
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- 238000010248 power generation Methods 0.000 abstract 1
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- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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- H02J3/383—
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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 provides a photovoltaic inverter and a control method thereof. The inverter comprises a bus circuit and an inverter circuit. The bus circuit comprises a first boost circuit, a second boost circuit, a first bypass circuit, a second bypass circuit, a first energy storage unit and a second energy storage unit. The first end of a first direct-current power supply is connected with the first end of the first bypass circuit and the input end of the first boost voltage. The second end of the first direct-current power supply is connected with the first end of the a second direct-current circuit, the grounding end of the first boost circuit, the grounding end of the second boost circuit, the second end of the first energy-storage unit and the first end of the second energy storage unit. The second end of the second direct-current power supply is connected with the input end of the second boost circuit and the first end of the second bypass circuit. A photovoltaic power supply of the photovoltaic inverter is divided into the two direct-current power supplies, when output current of at least one photovoltaic assembly in the photovoltaic power supply is reduced, influences on output power of other photovoltaic assemblies are reduced, and accordingly the total power generation amount of the photovoltaic inverter is increased.
Description
Technical field
The present invention relates to field of photovoltaic technology, especially relate to a kind of photovoltaic DC-to-AC converter and control method thereof.
Background technology
In photovoltaic DC-to-AC converter, by photo-voltaic power supply, transform light energy is become direct current energy, and convert direct current energy to AC energy by inverter circuit.Wherein, photo-voltaic power supply is usually in series by multiple photovoltaic module, to meet the requirement of user to voltage or power.
But, photovoltaic module due to aging decay, abnormal damage, hot spot, barrier block, the many reasons such as dust impact, there will be the situation that output current reduces.Due to multiple photovoltaic module be connected in series time, the output current of photo-voltaic power supply is determined by the minimum output current of each photovoltaic module, therefore, when there being the output current of at least one photovoltaic module to reduce, the power output of other each photovoltaic modulies of series connection can be affected, finally cause the gross generation of photovoltaic DC-to-AC converter to reduce.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of photovoltaic DC-to-AC converter and control method thereof, to realize when there being the output current of at least one photovoltaic module to reduce, reduce the impact on the power output of other each photovoltaic modulies, thus improve the gross generation of photovoltaic DC-to-AC converter.
For this reason, the technical scheme of technical solution problem of the present invention is:
The invention provides a kind of photovoltaic DC-to-AC converter, comprising: a bus circuit and inverter circuit;
Described bus circuit comprises: the first booster circuit, the second booster circuit, the first bypass circuit, the second bypass circuit, the first energy-storage units and the second energy-storage units; Described first energy-storage units and described second energy-storage units comprise the energy-storage travelling wave tube that at least one series, parallel or connection in series-parallel are connected respectively;
The first end of described first bypass circuit is connected the first end of the first DC power supply with the input of described first booster circuit, second end of described first DC power supply connects the first end of the first end of the second DC power supply, the earth terminal of described first booster circuit, the earth terminal of described second booster circuit, the second end of described first energy-storage units and described second energy-storage units, and the second end of described second DC power supply connects the input of described second booster circuit and the first end of described second bypass circuit; The tie point of described first DC power supply and described second DC power supply is as the mid point of described bus circuit;
The output of described first booster circuit connects the second end of described first bypass circuit and the first end of described first energy-storage units, and the output of described second booster circuit connects the second end of described second bypass circuit and the second end of described second energy-storage units;
The output of described first booster circuit and the output of described second booster circuit as the output of described bus circuit, and connect described inverter circuit.
Optionally, described inverter also comprises: the 3rd energy-storage units of series connection and the 4th energy-storage units, and described 3rd energy-storage units and described 4th energy-storage units comprise the energy-storage travelling wave tube that at least one series, parallel or connection in series-parallel are connected respectively;
To connect between the output of described first booster circuit and the output of described second booster circuit described 3rd energy-storage units and described 4th energy-storage units, described 3rd energy-storage units is connected described inverter circuit with the tie point of described 4th energy-storage units, and described 3rd energy-storage units and the described tie point of the 4th energy-storage units and the mid point of described bus circuit disconnect.
Optionally, described photovoltaic DC-to-AC converter has the first operation mode;
If described photovoltaic DC-to-AC converter is operated in the first operation mode, described first booster circuit and described second booster circuit work, described first bypass circuit and described second bypass circuit do not work, carry out MPPT control independently by described first booster circuit and described second booster circuit, arrive respective maximum power point (mpp) respectively to make described first DC power supply and described second DC power supply.
Optionally, described photovoltaic DC-to-AC converter also has the second operation mode and the 3rd operation mode;
If described photovoltaic DC-to-AC converter is operated in the second operation mode, described first booster circuit and described second booster circuit work, described first bypass circuit and described second bypass circuit do not work, integrally carry out MPPT control by described first booster circuit and described second booster circuit, arrive maximum power point (mpp) to make the series circuit entirety of described first DC power supply and described second DC power supply;
If described photovoltaic DC-to-AC converter is operated in the 3rd operation mode, described first bypass circuit and described second bypass circuit work, described first booster circuit and described second booster circuit do not work, carry out MPPT control by described inverter circuit, arrive maximum power point (mpp) to make the series circuit entirety of described first DC power supply and described second DC power supply.
Optionally, total output voltage of described first DC power supply and described second DC power supply is less than the normal grid-connected voltage of photovoltaic DC-to-AC converter;
If the output voltage of at least one booster circuit is more than or equal to device threshold voltage in described first booster circuit and described second booster circuit, described photovoltaic DC-to-AC converter is operated in described second operation mode;
If the output voltage of the output voltage of described first booster circuit and described second booster circuit is all less than device threshold voltage, described photovoltaic DC-to-AC converter is operated in described first operation mode.
Optionally, total output voltage of described first DC power supply and described second DC power supply is more than or equal to the normal grid-connected voltage of photovoltaic DC-to-AC converter;
If the output voltage of at least one booster circuit is more than or equal to device threshold voltage in described first booster circuit and described second booster circuit, described photovoltaic DC-to-AC converter is operated in described 3rd operation mode;
If the output voltage of the output voltage of described first booster circuit and described second booster circuit is all less than device threshold voltage, if the first energy output is greater than the second energy output, described photovoltaic DC-to-AC converter is operated in the first operation mode, if the first energy output is less than the second energy output, described photovoltaic DC-to-AC converter is operated in the 3rd operation mode, described first energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described first operation mode, described second energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described 3rd operation mode.
The invention provides a kind of photovoltaic generating system, comprise above-mentioned arbitrary photovoltaic DC-to-AC converter, described first DC power supply and described second DC power supply.
Optionally, a1+a2 DC power supply is also comprised, a1 >=1, a2 >=1; Wherein a1 DC power supply is in parallel with described first DC power supply, and a2 DC power supply is in parallel with described second DC power supply in addition.
The invention provides a kind of photovoltaic generating system, comprising: individual first DC power supply of s, s the second DC power supply, a s bus circuit and inverter circuit; Wherein, s > 1, each bus circuit is above-mentioned arbitrary bus circuit;
The output of each bus circuit is connected and the mid point of each bus circuit is connected;
The output of each bus circuit connects described inverter circuit, and input connects each first DC power supply and each second DC power supply respectively.
The invention provides a kind of control method of photovoltaic DC-to-AC converter, for above-mentioned arbitrary photovoltaic DC-to-AC converter, described method comprises:
Control described photovoltaic DC-to-AC converter and be operated in the first operation mode;
Wherein, if described photovoltaic DC-to-AC converter is operated in the first operation mode, described first booster circuit and described second booster circuit work, described first bypass circuit and described second bypass circuit do not work, carry out MPPT control independently by described first booster circuit and described second booster circuit, arrive respective maximum power point (mpp) respectively to make described first DC power supply and described second DC power supply.
Optionally, described method also comprises:
Control described photovoltaic DC-to-AC converter and be operated in the second operation mode;
Control described photovoltaic DC-to-AC converter and be operated in the 3rd operation mode;
Wherein, if described photovoltaic DC-to-AC converter is operated in the second operation mode, described first booster circuit and described second booster circuit work, described first bypass circuit and described second bypass circuit do not work, integrally carry out MPPT control by described first booster circuit and described second booster circuit, arrive maximum power point (mpp) to make the series circuit entirety of described first DC power supply and described second DC power supply;
If described photovoltaic DC-to-AC converter is operated in the 3rd operation mode, described first bypass circuit and described second bypass circuit work, described first booster circuit and described second booster circuit do not work, carry out MPPT control by described inverter circuit, arrive maximum power point (mpp) to make the series circuit entirety of described first DC power supply and described second DC power supply.
Optionally, control described photovoltaic DC-to-AC converter and be operated in the first operation mode, comprising:
If judge, total output voltage of described first DC power supply and described second DC power supply is less than the normal grid-connected voltage of photovoltaic DC-to-AC converter, and the output voltage of the output voltage of described first booster circuit and described second booster circuit is all less than device threshold voltage, controls described photovoltaic DC-to-AC converter and be operated in described first operation mode; And/or
If judge, total output voltage of described first DC power supply and described second DC power supply is more than or equal to the normal grid-connected voltage of photovoltaic DC-to-AC converter, the output voltage of described first booster circuit and the output voltage of described second booster circuit are all less than device threshold voltage, and the first energy output is greater than the second energy output, control described photovoltaic DC-to-AC converter and be operated in the first operation mode, wherein, described first energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described first operation mode, described second energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described 3rd operation mode.
Optionally, control described photovoltaic DC-to-AC converter and be operated in the second operation mode, comprising:
If judge, total output voltage of described first DC power supply and described second DC power supply is less than the normal grid-connected voltage of photovoltaic DC-to-AC converter, in described first booster circuit and described second booster circuit, the output voltage of at least one booster circuit is more than or equal to device threshold voltage, controls described photovoltaic DC-to-AC converter and is operated in described second operation mode.
Optionally, control described photovoltaic DC-to-AC converter and be operated in the 3rd operation mode, comprising:
If judge, total output voltage of described first DC power supply and described second DC power supply is more than or equal to the normal grid-connected voltage of photovoltaic DC-to-AC converter, in described first booster circuit and described second booster circuit, the output voltage of at least one booster circuit is more than or equal to device threshold voltage, controls described photovoltaic DC-to-AC converter and is operated in the 3rd operation mode; And/or,
If judge, total output voltage of described first DC power supply and described second DC power supply is more than or equal to the normal grid-connected voltage of photovoltaic DC-to-AC converter, the output voltage of described first booster circuit and the output voltage of described second booster circuit are all less than device threshold voltage, and the first energy output is less than the second energy output, control described photovoltaic DC-to-AC converter and be operated in the 3rd operation mode, wherein, described first energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described first operation mode, described second energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described 3rd operation mode.
Known by technique scheme, in the photovoltaic DC-to-AC converter of the embodiment of the present invention, the first bypass circuit, the second bypass circuit, the first booster circuit, the second booster circuit, the first energy-storage units and the second energy-storage units connect the first DC power supply and second DC power supply of series connection.Wherein, the tie point of the first and second DC power supply connects the earth terminal of the earth terminal of the first booster circuit, the second booster circuit and the tie point of the first and second energy-storage units.In the visible embodiment of the present invention, photo-voltaic power supply divide into the DC power supply of two series connection, when there being the output current of at least one photovoltaic module to reduce in photo-voltaic power supply, only impact can belong to the power output of other each photovoltaic modulies of same DC power supply, reduce the impact of the power output on other each photovoltaic modulies, thus improve the gross generation of photovoltaic DC-to-AC converter.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of embodiment of photovoltaic DC-to-AC converter provided by the invention;
Fig. 2 is a kind of physical circuit of photovoltaic DC-to-AC converter provided by the invention;
Fig. 3 is the structural representation of a kind of embodiment of photovoltaic generating system provided by the invention;
Fig. 4 is the structural representation of the another kind of embodiment of photovoltaic generating system provided by the invention;
Fig. 5 is the schematic flow sheet of a kind of embodiment of control method provided by the invention.
Embodiment
Technical scheme in the present invention is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
Refer to Fig. 1, embodiments provide a kind of embodiment of photovoltaic DC-to-AC converter.The photovoltaic DC-to-AC converter of the present embodiment comprises: a bus circuit 10 and inverter circuit 20.
Bus circuit 10 comprises: the first booster circuit 103, second booster circuit 104, first bypass circuit 105, second bypass circuit 106, first energy-storage units 107 and the second energy-storage units 108.
Wherein, the first energy-storage units 107 and the second energy-storage units 108 comprise the energy-storage travelling wave tube that at least one series, parallel or connection in series-parallel are connected respectively, and energy-storage travelling wave tube can be electric capacity etc.First bypass circuit 105 and the second bypass circuit 106 can comprise diode, switching device etc., wherein, switching device refers to the device with switching function, such as Metal-Oxide Semiconductor field-effect transistor (MOSFET), relay (RELAY), insulated gate bipolar transistor (IGBT), gate level turn-off thyristor (GTO), carborundum (SIC) device (such as SIC diode, SICIGBT, SICMOSFET etc.).
The first end of the first bypass circuit 105 is connected the first end of the first DC power supply 101 with the input of the first booster circuit 103, second end of the first DC power supply 101 connects the first end of the first end of the second DC power supply 102, the earth terminal of the first booster circuit 103, the earth terminal of the second booster circuit 104, the second end of the first energy-storage units 107 and the second energy-storage units 108, and the second end of the second DC power supply 102 connects the input of the second booster circuit 104 and the first end of the second bypass circuit 106.The output of the first booster circuit 103 connects the second end of the first bypass circuit 105 and the first end of the first energy-storage units 107, and the output of the second booster circuit 104 connects the second end of the second bypass circuit 106 and the second end of the second energy-storage units 108.
Wherein, the tie point of the first DC power supply 101 and the second DC power supply 102 is as the mid point of bus circuit 10; The output of the first booster circuit 103 and the output of the second booster circuit 104 as the output of bus circuit 10, and connect inverter circuit 20.Wherein, inverter circuit 20 converts the direct current energy that the output of bus circuit 10 exports to AC energy, and can be supplied to AC network by filter 30.
First DC power supply 101 and the second DC power supply 102 can comprise the photovoltaic module that at least one is connected or connection in series-parallel is connected respectively, such as, first DC power supply 101 comprises the photovoltaic module of m series connection, second DC power supply 102 comprises the photovoltaic module of n series connection, m >=1, n >=1, m and n can be equal, also can be unequal.
Known by technique scheme, in the photovoltaic DC-to-AC converter of the embodiment of the present invention, the first booster circuit 103, second booster circuit 104, first bypass circuit 105, second bypass circuit 106, first energy-storage units 107 and the second energy-storage units 108 connect the first DC power supply 101 and the second DC power supply 102 of series connection.Wherein, the first DC power supply 101 is connected the earth terminal of the first booster circuit 103, the earth terminal of the second booster circuit 104 with the tie point of the second DC power supply 102, and the tie point of the first energy-storage units 107 and the second energy-storage units 108.In the visible embodiment of the present invention, photo-voltaic power supply divide into the DC power supply of two series connection, first booster circuit 103 and the second booster circuit 104 can be passed through, carry out maximum power point (mpp) tracking (MaximumPowerPointTracking independently, MPPT) control, now when there being the output current of at least one photovoltaic module to reduce in photo-voltaic power supply, only impact belongs to the power output of other each photovoltaic modulies of same DC power supply.The embodiment of the present invention is specially adapted to need to connect in the photovoltaic DC-to-AC converter of more photovoltaic module, such as, in the photovoltaic DC-to-AC converter of 1500V.
Illustrate, first DC power supply 101 comprises the photovoltaic module of m series connection, second DC power supply 102 comprises the photovoltaic module of n series connection, when a photovoltaic module output current in the photovoltaic module of n series connection reduces, only affect the power output of other n-1 photovoltaic module in the second DC power supply 102, and the power output of m photovoltaic module in the first DC power supply 101 can not be affected, and in prior art, integrally MPPT tracking is carried out to the photovoltaic module of series connection all in photo-voltaic power supply by booster circuit, when the output current of a photovoltaic module reduces, the power output of other m+n-1 photovoltaic module can be affected.Visible, the embodiment of the present invention reduces the impact of the power output on other each photovoltaic modulies, thus can improve the gross generation of photovoltaic DC-to-AC converter.
In the present embodiment, photovoltaic DC-to-AC converter can also comprise: the 3rd energy-storage units 109 of series connection and the 4th energy-storage units 110, and wherein, the 3rd energy-storage units 109 and the 4th energy-storage units 110 comprise the energy-storage travelling wave tube that at least one series, parallel or connection in series-parallel are connected respectively.First energy-storage units 107, second energy-storage units 108, the 3rd energy-storage units 109 and the 4th energy-storage units 110 form bus energy-storage units.
Series connection the 3rd energy-storage units 109 and the 4th energy-storage units 110 between the output of the first booster circuit 103 and the output of the second booster circuit 104,3rd energy-storage units 109 is connected inverter circuit 20 with the tie point of the 4th energy-storage units 110, such as, connect the mid point of inverter circuit 20.Wherein, 3rd energy-storage units 109 disconnects (not namely being connected) with the mid point of bus circuit 10 with the tie point of the 4th energy-storage units 110, this is because when carrying out MPPT control independently by the first booster circuit 103 and the second booster circuit 104, the voltage (i.e. the output voltage of the first booster circuit 103) at the first energy-storage units 107 two ends is usually unequal with the voltage (i.e. the output voltage of the second booster circuit 104) at the second energy-storage units 108 two ends, and the voltage at the 3rd energy-storage units 109 and the 4th energy-storage units 110 two ends requires equal usually, can not have an impact to the voltage at the third and fourth energy-storage units two ends to make the voltage at the first and second energy-storage units two ends.Therefore, the tie point of the 3rd energy-storage units 109 and the 4th energy-storage units 110 and the mid point of bus circuit 10 disconnect.
In the present embodiment, first booster circuit 103 and the second booster circuit 104 can be respectively BOOST circuit, such as shown in Fig. 2, first booster circuit 103 and the second booster circuit 104 form 3 level BOOST circuit, first booster circuit 103 is the first half of 3 level BOOST circuit, and the second booster circuit 104 is the latter half of 3 level BOOST circuit.
Wherein, first booster circuit 103 comprises inductance L 1, switching tube Q1 and diode D1, the first end of inductance L 1 is as the input of the first booster circuit 103, second end of inductance L 1 connects the positive pole of diode D1 and the first end of switching tube Q1, the negative pole of diode D1 is as the output of the first booster circuit 103, and second end of switching tube Q1 is as the earth terminal of the first booster circuit 103.Second booster circuit 104 comprises inductance L 2, switching tube Q2 and diode D2, wherein the first end of inductance L 2 is as the input of the second booster circuit 104, second end of inductance L 2 connects the negative pole of diode D2 and second end of switching tube Q2, the positive pole of diode D2 is as the output of the second booster circuit 104, and the first end of switching tube Q2 is as the earth terminal of the second booster circuit 104.
Below for the physical circuit of Fig. 2, the operation mode of photovoltaic DC-to-AC converter is described.It should be noted that, 3 level BOOST circuit are formed with the first booster circuit 103 and the second booster circuit 104 in Fig. 2, first energy-storage units 107 comprises electric capacity C1, second energy-storage units 108 comprises electric capacity C2,3rd energy-storage units 109 comprises electric capacity C3, it is that example is described that 4th energy-storage units 110 comprises electric capacity C4, and these examples can't play restriction to the embodiment of the present invention.
The photovoltaic DC-to-AC converter of the present embodiment has the first operation mode.
If photovoltaic DC-to-AC converter is operated in the first operation mode, 3 level BOOST circuit workings, first bypass circuit 105 and the second bypass circuit 106 do not work, MPPT control is carried out independently by the first half of 3 level BOOST circuit and the latter half, namely the first half of 3 level BOOST circuit carries out MPPT control to the first DC power supply 101, the latter half of 3 level BOOST circuit carries out MPPT control to the second DC power supply 102, arrives respective maximum power point (mpp) respectively to make the first DC power supply 101 and the second DC power supply 102.Now, owing to carrying out MPPT control independently by the first half of 3 level BOOST circuit and the latter half, therefore when the output current of at least one photovoltaic module in the first DC power supply 101 or the second DC power supply 102 reduces, only impact belongs to the power output of other each photovoltaic modulies of same DC power supply, thus can improve the gross generation of photovoltaic DC-to-AC converter.
Wherein, the output voltage of the first half of 3 level BOOST circuit is Vo1 (i.e. the output voltage of the first booster circuit 103), input voltage is Vin1 (i.e. the output voltage of the first DC power supply 101), the output voltage of the latter half of 3 level BOOST circuit is Vo2 (i.e. the output voltage of the second booster circuit 104), and input voltage is Vin2 (i.e. the output voltage of the second DC power supply 102).Vo1 and Vo2 distributes according to the first half of 3 level BOOST circuit and the latter half power separately, and busbar voltage is Vo1 and Vo2 sum.
The photovoltaic DC-to-AC converter of the present embodiment can also have the second operation mode and the 3rd operation mode.
Wherein, if photovoltaic DC-to-AC converter is operated in the second operation mode, 3 level BOOST circuit workings, first bypass circuit 105 and the second bypass circuit 106 do not work, carry out MPPT control by 3 level BOOST circuit integrity, arrive maximum power point (mpp) to make the series circuit entirety of the first DC power supply 101 and the second DC power supply 102.
If photovoltaic DC-to-AC converter is operated in the 3rd operation mode, first bypass circuit 105 and the second bypass circuit 106 work, 3 level BOOST circuit do not work, carry out MPPT control by inverter circuit 20, arrive maximum power point (mpp) to make the series circuit entirety of the first DC power supply 101 and the second DC power supply 102.
The control mode of the photovoltaic DC-to-AC converter of the lower mask body embodiment of the present invention.This control mode is divided into two kinds of situations.
The first situation, during Vin1+Vin2 < U, wherein Vin1+Vin2 is total output voltage of the first DC power supply 101 and the second DC power supply 102, and U is the normal grid-connected voltage of photovoltaic DC-to-AC converter, is the minimum grid-connected voltage of bus.
(1) if Vo1 >=Vth and Vo2 < Vth, described photovoltaic DC-to-AC converter is operated in described second operation mode, namely carries out MPPT control by 3 level BOOST circuit integrity.
Wherein, Vth is device threshold voltage, i.e. the maximum voltage limit value of device.Such as, Vlimt is the minimum value of the rated voltage of each device in bus circuit, such as, switching tube Q1 and Q2 in Fig. 2, diode D1 and D2, the minimum value of the rated voltage in electric capacity C1 and C2, derate surplus when △ V is each devices function in bus circuit, then Vth can be Vlimt-△ V.
As Vo1 >=Vlimt, the device in bus circuit may be damaged, therefore, in the present embodiment when Vo1 >=Vth, make described photovoltaic DC-to-AC converter be operated in described second operation mode, thus can Vo1 be reduced, avoid device damaged.
(2) if Vo1 < Vth and Vo2 >=Vth, described photovoltaic DC-to-AC converter is operated in described second operation mode, namely carries out MPPT control by 3 level BOOST circuit integrity.
As Vo2 >=Vlimt, the device in bus circuit may be damaged, therefore, in the present embodiment when Vo2 >=Vth, make described photovoltaic DC-to-AC converter be operated in described second operation mode, thus can Vo2 be reduced, avoid device damaged.
(3) if Vo1 < Vth and Vo2 < Vth, described photovoltaic DC-to-AC converter is operated in the first operation mode, carrying out MPPT control independently by the first half of 3 level BOOST circuit and the latter half, can energy output be improved when there being the output current of at least one photovoltaic module to reduce.
(4) if Vo2 >=Vth and Vo1 >=Vth, described photovoltaic DC-to-AC converter is operated in described second operation mode, namely carries out MPPT control by 3 level BOOST circuit integrity.
As Vo2 >=Vlimt, Vo2 >=Vlimt, the device in bus circuit may be damaged, therefore, in the present embodiment when Vo2 >=Vth, Vo1 >=Vth, make described photovoltaic DC-to-AC converter be operated in described second operation mode, thus can Vo1 and Vo2 be reduced, avoid device damaged.
The second situation, during Vin1+Vin2 >=U.
(1) if at least one voltage is more than or equal to Vth in Vo1 and Vo2, i.e. Vo1 >=Vth and Vo2 < Vth, Vo1 < Vth and Vo2 >=Vth, or, Vo1 >=Vth and Vo2 >=Vth, described photovoltaic DC-to-AC converter is operated in described 3rd operation mode, is namely powered directly to inverter circuit 20 by the first bypass circuit 105 and the second bypass circuit 106, and carries out MPPT control by inverter circuit 20.
(2) if Vo1 < Vth and Vo2 < Vth, now need to judge to adopt the first operation mode or the third operation mode according to energy output, Specific Principles is the operation mode that employing energy output is high.
Particularly, the energy output of photovoltaic DC-to-AC converter when photovoltaic DC-to-AC converter is operated in the first operation mode is the first energy output, the energy output of photovoltaic DC-to-AC converter when photovoltaic DC-to-AC converter is operated in the third operation mode is the second energy output, the magnitude relationship of the first energy output and the second energy output is judged by modes such as softwares, if the first energy output is greater than the second energy output, then photovoltaic DC-to-AC converter is operated in the first operation mode, namely carries out MPPT control independently by the first half of 3 level BOOST circuit and the latter half; If the second energy output is greater than the first energy output, then photovoltaic DC-to-AC converter is operated in the 3rd operation mode, namely carries out MPPT control by inverter circuit 20.
The embodiment of the present invention additionally provides a kind of embodiment of photovoltaic generating system.The photovoltaic generating system of the present embodiment comprises the above-mentioned any embodiment of photovoltaic DC-to-AC converter, also comprises the first DC power supply 101 and the second DC power supply 102.
As shown in Figure 3, in the photovoltaic generating system of the embodiment of the present invention, (a1+a2) individual DC power supply can also be comprised, each DC power supply comprises at least one series connection respectively or goes here and there and the photovoltaic module connected, a1 >=1, a2 >=1, a1 and a2 can be equal, also can be unequal; Wherein a1 DC power supply is in parallel with the first DC power supply 101, and a2 DC power supply is in parallel with the second DC power supply 102 in addition.
Wherein, in the first operation mode, MPPT control is carried out independently by the first booster circuit 103 and the second booster circuit 104, to make described first DC power supply 101 and each DC power supply entirety in parallel with the first DC power supply 101 arrive maximum power point (mpp), and described second DC power supply 102 and each DC power supply entirety in parallel with the second DC power supply 102 is made to arrive maximum power point (mpp).
In the second operation mode, integrally carry out MPPT control by the first booster circuit and the second booster circuit, arrive maximum power point (mpp) to make the first DC power supply 101, second DC power supply 102 and (a1+a2) individual DC power supply entirety.
As shown in Figure 4, the present embodiment additionally provides the another kind of embodiment of photovoltaic generating system.The photovoltaic generating system of the present embodiment comprises s the first DC power supply 101, s the second DC power supply 102, a s bus circuit and inverter circuit 20.s＞1。
Wherein, above-mentioned arbitrary bus circuit that each bus circuit provides for the embodiment of the present invention, and mode of operation is also also identical with the mode of operation of above-mentioned arbitrary bus circuit, specifically refers to the relevant part of above-described embodiment, repeats no more here.
The output of each bus circuit of the present embodiment is connected, and all connects inverter circuit 20; And the mid point of each bus circuit is connected; The input of each bus circuit connects each the first DC power supply 101 and the second DC power supply 102 respectively.
Refer to Fig. 5, the embodiment of the present invention additionally provides a kind of embodiment of the control method of photovoltaic DC-to-AC converter, and the present embodiment is used in the arbitrary photovoltaic DC-to-AC converter of Fig. 1 to Fig. 3.
The described method of the present embodiment comprises:
S501: control photovoltaic DC-to-AC converter and be operated in the first operation mode.
Wherein, if photovoltaic DC-to-AC converter is operated in the first operation mode, first booster circuit 103 and the second booster circuit 104 work, first bypass circuit 105 and the second bypass circuit 106 do not work, carry out MPPT control independently by the first booster circuit 103 and the second booster circuit 104, arrive respective maximum power point (mpp) respectively to make the first DC power supply 101 and the second DC power supply 102.
Described method can also comprise:
Control photovoltaic DC-to-AC converter and be operated in the second operation mode;
Control photovoltaic DC-to-AC converter and be operated in the 3rd operation mode.
Wherein, if photovoltaic DC-to-AC converter is operated in the second operation mode, first booster circuit 103 and the second booster circuit 104 work, first bypass circuit 105 and the second bypass circuit 106 do not work, integrally carry out MPPT control by the first booster circuit 103 and the second booster circuit 104, arrive maximum power point (mpp) to make the series circuit entirety of the first DC power supply 101 and the second DC power supply 102.
If photovoltaic DC-to-AC converter is operated in the 3rd operation mode, first bypass circuit 105 and the second bypass circuit 106 work, first booster circuit 103 and the second booster circuit 104 do not work, carry out MPPT control by inverter circuit 20, arrive maximum power point (mpp) to make the series circuit entirety of the first DC power supply 101 and the second DC power supply 102.
Optionally, control photovoltaic DC-to-AC converter and be operated in the first operation mode, comprising:
If judge Vin1+Vin2 < U, and Vo1 < Vth and Vo2 < Vth, control photovoltaic DC-to-AC converter and be operated in the first operation mode; And/or
If judge Vin1+Vin2 >=U, Vo1 < Vth and Vo2 < Vth, and the first energy output is greater than the second energy output, control photovoltaic DC-to-AC converter and be operated in the first operation mode, wherein, first energy output is the energy output of the photovoltaic DC-to-AC converter of photovoltaic DC-to-AC converter when being operated in the first operation mode, and the second energy output is the energy output of the photovoltaic DC-to-AC converter of photovoltaic DC-to-AC converter when being operated in the 3rd operation mode.
Optionally, control photovoltaic DC-to-AC converter and be operated in the second operation mode, comprising:
If judge Vin1+Vin2 < U, and the output voltage >=Vth of at least one booster circuit in the first booster circuit 103 and the second booster circuit 104, i.e. Vo1 >=Vth and Vo2 < Vth, Vo1 < Vth and Vo2 >=Vth, or, Vo1 >=Vth and Vo2 >=Vth, control described photovoltaic DC-to-AC converter and be operated in described second operation mode.
Optionally, control photovoltaic DC-to-AC converter and be operated in the 3rd operation mode, comprising:
If judge Vin1+Vin2 >=U, in the first booster circuit 103 and the second booster circuit 104, the output voltage >=Vth of at least one booster circuit, controls described photovoltaic DC-to-AC converter and is operated in the 3rd operation mode; And/or,
If judge Vin1+Vin2 >=U, Vo1 < Vth and Vo2 < Vth, and the first energy output is less than the second energy output, controls described photovoltaic DC-to-AC converter and is operated in the 3rd operation mode.Wherein, described first energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described first operation mode, and described second energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described 3rd operation mode.
Those skilled in the art can be well understood to, and for convenience and simplicity of description, the system of foregoing description, the specific works process of device and unit, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
In several embodiment provided by the present invention, should be understood that, disclosed system, apparatus and method, can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disc or CD etc. various can be program code stored medium.
The above, above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (14)
1. a photovoltaic DC-to-AC converter, is characterized in that, comprising: a bus circuit and inverter circuit;
Described bus circuit comprises: the first booster circuit, the second booster circuit, the first bypass circuit, the second bypass circuit, the first energy-storage units and the second energy-storage units; Described first energy-storage units and described second energy-storage units comprise the energy-storage travelling wave tube that at least one series, parallel or connection in series-parallel are connected respectively;
The first end of described first bypass circuit is connected the first end of the first DC power supply with the input of described first booster circuit, second end of described first DC power supply connects the first end of the first end of the second DC power supply, the earth terminal of described first booster circuit, the earth terminal of described second booster circuit, the second end of described first energy-storage units and described second energy-storage units, and the second end of described second DC power supply connects the input of described second booster circuit and the first end of described second bypass circuit; The tie point of described first DC power supply and described second DC power supply is as the mid point of described bus circuit;
The output of described first booster circuit connects the second end of described first bypass circuit and the first end of described first energy-storage units, and the output of described second booster circuit connects the second end of described second bypass circuit and the second end of described second energy-storage units;
The output of described first booster circuit and the output of described second booster circuit as the output of described bus circuit, and connect described inverter circuit.
2. photovoltaic DC-to-AC converter according to claim 1, it is characterized in that, described inverter also comprises: the 3rd energy-storage units of series connection and the 4th energy-storage units, and described 3rd energy-storage units and described 4th energy-storage units comprise the energy-storage travelling wave tube that at least one series, parallel or connection in series-parallel are connected respectively;
To connect between the output of described first booster circuit and the output of described second booster circuit described 3rd energy-storage units and described 4th energy-storage units, described 3rd energy-storage units is connected described inverter circuit with the tie point of described 4th energy-storage units, and described 3rd energy-storage units and the described tie point of the 4th energy-storage units and the mid point of described bus circuit disconnect.
3. photovoltaic DC-to-AC converter according to claim 1 and 2, is characterized in that, described photovoltaic DC-to-AC converter has the first operation mode;
If described photovoltaic DC-to-AC converter is operated in the first operation mode, described first booster circuit and described second booster circuit work, described first bypass circuit and described second bypass circuit do not work, carry out MPPT control independently by described first booster circuit and described second booster circuit, arrive respective maximum power point (mpp) respectively to make described first DC power supply and described second DC power supply.
4. photovoltaic DC-to-AC converter according to claim 3, is characterized in that, described photovoltaic DC-to-AC converter also has the second operation mode and the 3rd operation mode;
If described photovoltaic DC-to-AC converter is operated in the second operation mode, described first booster circuit and described second booster circuit work, described first bypass circuit and described second bypass circuit do not work, integrally carry out MPPT control by described first booster circuit and described second booster circuit, arrive maximum power point (mpp) to make the series circuit entirety of described first DC power supply and described second DC power supply;
If described photovoltaic DC-to-AC converter is operated in the 3rd operation mode, described first bypass circuit and described second bypass circuit work, described first booster circuit and described second booster circuit do not work, carry out MPPT control by described inverter circuit, arrive maximum power point (mpp) to make the series circuit entirety of described first DC power supply and described second DC power supply.
5. photovoltaic DC-to-AC converter according to claim 4, is characterized in that, total output voltage of described first DC power supply and described second DC power supply is less than the normal grid-connected voltage of photovoltaic DC-to-AC converter;
If the output voltage of at least one booster circuit is more than or equal to device threshold voltage in described first booster circuit and described second booster circuit, described photovoltaic DC-to-AC converter is operated in described second operation mode;
If the output voltage of the output voltage of described first booster circuit and described second booster circuit is all less than device threshold voltage, described photovoltaic DC-to-AC converter is operated in described first operation mode.
6. photovoltaic DC-to-AC converter according to claim 4, is characterized in that, total output voltage of described first DC power supply and described second DC power supply is more than or equal to the normal grid-connected voltage of photovoltaic DC-to-AC converter;
If the output voltage of at least one booster circuit is more than or equal to device threshold voltage in described first booster circuit and described second booster circuit, described photovoltaic DC-to-AC converter is operated in described 3rd operation mode;
If the output voltage of the output voltage of described first booster circuit and described second booster circuit is all less than device threshold voltage, if the first energy output is greater than the second energy output, described photovoltaic DC-to-AC converter is operated in the first operation mode, if the first energy output is less than the second energy output, described photovoltaic DC-to-AC converter is operated in the 3rd operation mode, described first energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described first operation mode, described second energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described 3rd operation mode.
7. a photovoltaic generating system, is characterized in that, comprise the photovoltaic DC-to-AC converter as described in any one of claim 1 to 6, as described in the first DC power supply and as described in the second DC power supply.
8. photovoltaic generating system according to claim 7, is characterized in that, also comprises a1+a2 DC power supply, a1 >=1, a2 >=1; Wherein a1 DC power supply is in parallel with described first DC power supply, and a2 DC power supply is in parallel with described second DC power supply in addition.
9. a photovoltaic generating system, is characterized in that, comprising: individual first DC power supply of s, s the second DC power supply, a s bus circuit and inverter circuit; Wherein, s > 1, each bus circuit is the bus circuit as described in any one of claim 1 to 6;
The output of each bus circuit is connected and the mid point of each bus circuit is connected;
The output of each bus circuit connects described inverter circuit, and input connects each first DC power supply and each second DC power supply respectively.
10. a control method for photovoltaic DC-to-AC converter, is characterized in that, for photovoltaic DC-to-AC converter as claimed in claim 1 or 2, described method comprises:
Control described photovoltaic DC-to-AC converter and be operated in the first operation mode;
Wherein, if described photovoltaic DC-to-AC converter is operated in the first operation mode, described first booster circuit and described second booster circuit work, described first bypass circuit and described second bypass circuit do not work, carry out MPPT control independently by described first booster circuit and described second booster circuit, arrive respective maximum power point (mpp) respectively to make described first DC power supply and described second DC power supply.
11. methods according to claim 10, is characterized in that, described method also comprises:
Control described photovoltaic DC-to-AC converter and be operated in the second operation mode;
Control described photovoltaic DC-to-AC converter and be operated in the 3rd operation mode;
Wherein, if described photovoltaic DC-to-AC converter is operated in the second operation mode, described first booster circuit and described second booster circuit work, described first bypass circuit and described second bypass circuit do not work, integrally carry out MPPT control by described first booster circuit and described second booster circuit, arrive maximum power point (mpp) to make the series circuit entirety of described first DC power supply and described second DC power supply;
If described photovoltaic DC-to-AC converter is operated in the 3rd operation mode, described first bypass circuit and described second bypass circuit work, described first booster circuit and described second booster circuit do not work, carry out MPPT control by described inverter circuit, arrive maximum power point (mpp) to make the series circuit entirety of described first DC power supply and described second DC power supply.
12. methods according to claim 11, is characterized in that, control described photovoltaic DC-to-AC converter and are operated in the first operation mode, comprising:
If judge, total output voltage of described first DC power supply and described second DC power supply is less than the normal grid-connected voltage of photovoltaic DC-to-AC converter, and the output voltage of the output voltage of described first booster circuit and described second booster circuit is all less than device threshold voltage, controls described photovoltaic DC-to-AC converter and be operated in described first operation mode; And/or
If judge, total output voltage of described first DC power supply and described second DC power supply is more than or equal to the normal grid-connected voltage of photovoltaic DC-to-AC converter, the output voltage of described first booster circuit and the output voltage of described second booster circuit are all less than device threshold voltage, and the first energy output is greater than the second energy output, control described photovoltaic DC-to-AC converter and be operated in the first operation mode, wherein, described first energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described first operation mode, described second energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described 3rd operation mode.
13. methods according to claim 11, is characterized in that, control described photovoltaic DC-to-AC converter and are operated in the second operation mode, comprising:
If judge, total output voltage of described first DC power supply and described second DC power supply is less than the normal grid-connected voltage of photovoltaic DC-to-AC converter, in described first booster circuit and described second booster circuit, the output voltage of at least one booster circuit is more than or equal to device threshold voltage, controls described photovoltaic DC-to-AC converter and is operated in described second operation mode.
14. methods according to claim 11, is characterized in that, control described photovoltaic DC-to-AC converter and are operated in the 3rd operation mode, comprising:
If judge, total output voltage of described first DC power supply and described second DC power supply is more than or equal to the normal grid-connected voltage of photovoltaic DC-to-AC converter, in described first booster circuit and described second booster circuit, the output voltage of at least one booster circuit is more than or equal to device threshold voltage, controls described photovoltaic DC-to-AC converter and is operated in the 3rd operation mode; And/or,
If judge, total output voltage of described first DC power supply and described second DC power supply is more than or equal to the normal grid-connected voltage of photovoltaic DC-to-AC converter, the output voltage of described first booster circuit and the output voltage of described second booster circuit are all less than device threshold voltage, and the first energy output is less than the second energy output, control described photovoltaic DC-to-AC converter and be operated in the 3rd operation mode, wherein, described first energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described first operation mode, described second energy output is the energy output of the described photovoltaic DC-to-AC converter of described photovoltaic DC-to-AC converter when being operated in described 3rd operation mode.
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