CN115333394A - Multi-transformer combined high-power inverter and power generation system - Google Patents
Multi-transformer combined high-power inverter and power generation system Download PDFInfo
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- CN115333394A CN115333394A CN202211087253.8A CN202211087253A CN115333394A CN 115333394 A CN115333394 A CN 115333394A CN 202211087253 A CN202211087253 A CN 202211087253A CN 115333394 A CN115333394 A CN 115333394A
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- 238000010248 power generation Methods 0.000 title claims abstract description 20
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- 238000005070 sampling Methods 0.000 claims description 34
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The application relates to a high-power inverter and power generation system combined by multiple transformers, relating to the technical field of inverter power supplies and comprising a direct current boosting unit, an inverting unit, an alternating current processing unit and a control unit; the number of the direct current boosting units is multiple; the control unit is used for outputting a driving signal to control the direct current boosting unit to boost; the direct current boosting unit is used for receiving the driving signal and boosting a first direct current voltage of an external direct current power supply end according to the driving signal to obtain a second direct current voltage; the inversion unit is used for inverting the second direct-current voltage to obtain a first alternating-current voltage; the alternating current processing unit is used for stabilizing the first alternating current voltage to obtain a second alternating current voltage and outputting the second alternating current voltage; the control unit is also used for changing the output driving signal according to the second alternating voltage so as to enable the alternating current processing unit to output high-power voltage. The application has the effect of meeting the use requirement of the high-power inverter.
Description
Technical Field
The application relates to the technical field of inverter power supplies, in particular to a high-power inverter and power generation system combined by multiple transformers.
Background
Along with the continuous promotion of power consumption market, to electric power demand greatly increased, consequently appear the energy shortage or uneven phenomenon, photovoltaic energy storage invertion power supply is followed the market and is given birth, and photovoltaic energy storage invertion power supply includes energy storage and contravariant two parts.
In the related art, a power supply generated by photovoltaic is a direct current power supply, direct current needs to be converted into alternating current through an inverter, so that electric quantity generated by the photovoltaic is fed into a power grid, the selection of the inverter is usually determined according to the accessed direct current power supply and power required to be generated, but in a photovoltaic power plant, as the power required to be converted is higher and higher, the requirement on a transformer in the inverter is higher and higher, and at present, in the market of a large transformer, the market consumption of the large transformer is less, the purchase period is long, the price is high, and the production is difficult.
Disclosure of Invention
In order to meet the use requirement of the high-power inverter, the application provides the high-power inverter with the multi-transformer combination and the power generation system.
In a first aspect, the present application provides a multi-transformer combined high-power inverter and power generation system, which adopts the following technical solutions:
a high-power inverter combined by multiple transformers comprises a direct current boosting unit, an inverting unit, an alternating current processing unit and a control unit; the number of the direct current boosting units is multiple;
the power input ends of the direct current boosting units are connected to an external direct current power supply end, the control ends of the direct current boosting units are connected to the output end of the control unit, the power output ends of the direct current boosting units are connected to the input end of the inversion unit, the output end of the inversion unit is connected to the input end of the alternating current processing unit, and the output end of the alternating current processing unit is connected to the input end of the control unit and the alternating current output end of the inverter respectively;
the control unit is used for outputting a driving signal to control the direct current boosting unit to boost;
the direct current boosting unit is used for receiving the driving signal and boosting a first direct current voltage of the external direct current power supply end according to the driving signal to obtain a second direct current voltage;
the inversion unit is used for inverting the second direct-current voltage to obtain a first alternating-current voltage;
the alternating current processing unit is used for stabilizing the first alternating current voltage to obtain a second alternating current voltage and outputting the second alternating current voltage;
the control unit is further used for changing the output driving signal according to the second alternating voltage so as to enable the alternating current processing unit to output high-power voltage.
By adopting the technical scheme, when the high-power inverter is needed to merge the first direct-current voltage of the external direct-current power supply end into the power grid, the plurality of direct-current boosting units boost the first direct-current voltage to obtain the second direct-current voltage, so that the second direct-current voltage meets the output power of the high-power inverter, then the second direct-current voltage is inverted through the inverting unit and is converted into the first alternating-current voltage, the control unit controls the alternating-current processing unit to process the first alternating-current voltage to obtain the second alternating-current voltage, and the second alternating-current voltage output by the high-power inverter meets the use requirement.
Optionally, the dc boost unit includes a transformer T and a push-pull subunit, a control end of the push-pull subunit is connected to an output end of the control unit, a power input end of the push-pull subunit is connected to the external dc power supply end, a power output end of the push-pull subunit is connected to a primary winding of the transformer T, and a secondary winding of the transformer is connected to the ac processing unit;
the push-pull subunit is used for performing pulse width modulation on the direct current voltage of the primary winding of the transformer T and increasing the direct current voltage of the primary winding of the transformer T.
By adopting the technical scheme, the push-pull subunit performs pulse width modulation on the first direct-current voltage, and changes the duty ratio of the first direct-current voltage, so that the purpose of boosting the first direct-current voltage is achieved.
Optionally, the primary windings of the transformers are connected in parallel to the external dc power supply terminal, and the secondary windings of the transformers are connected in series and electrically connected to the ac processing unit.
By adopting the technical scheme, the primary winding of the transformer is connected in parallel, so that the first direct-current voltage can be continuously modulated and boosted, the first direct-current voltage of the primary winding of the transformer is increased, and meanwhile, the secondary winding of the transformer is connected in series, so that the output power of the first direct-current voltage can be increased, and therefore the output power of the high-power inverter is met, and the high-power inverter meets the use requirements.
Optionally, the ac processing unit includes a first filtering subunit and a voltage stabilizing subunit, an input end of the first filtering subunit is connected to an output end of the inverting unit, an output end of the first filtering subunit is connected to an input end of the voltage stabilizing unit, and an output end of the voltage stabilizing unit is connected to an ac output end of the inverter;
the first filtering subunit is used for filtering noise waves of the second alternating-current voltage;
the voltage stabilizing subunit is used for stabilizing the second alternating voltage, so that the second alternating voltage is more stable.
Optionally, the alternating current processing unit further includes a second filtering subunit and an electromagnetic compatibility subunit, an input end of the second filtering subunit is connected to an output end of the voltage stabilizing subunit, an output end of the second filtering subunit is connected to an input end of the electromagnetic compatibility subunit, and an output end of the electromagnetic compatibility subunit is connected to an alternating current output end of the inverter;
the second filtering subunit is used for performing low-pass filtering processing on the second alternating-current voltage to obtain a sinusoidal alternating-current voltage of the second alternating-current voltage;
the electromagnetic compatibility subunit is used for inhibiting radiation generated by the second alternating voltage and realizing electromagnetic compatibility.
Optionally, the method further includes:
and the first limit voltage sampling unit is connected with the alternating current processing unit and the control unit, and is used for sampling the short-circuit limit voltage of the second alternating current voltage and outputting the short-circuit limit voltage to the control unit.
Optionally, the method further includes:
the second voltage sampling unit is connected with the alternating current processing unit and the control unit; and the sampling circuit is used for sampling the real-time voltage of the second alternating voltage output by the alternating current processing unit to obtain a sampling voltage and outputting the sampling voltage to the control unit.
Optionally, a signal amplifying unit is electrically connected between the second voltage sampling unit and the control unit; the signal amplification unit is used for amplifying the sampling voltage.
In a second aspect, the present application provides a power generation system, which adopts the following technical solutions:
a power generation system comprising a power generation plant and a multi-transformer combined high power inverter as claimed in any one of the first aspects.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the high-power inverter is required to merge the first direct-current voltage of the external direct-current power supply end into a power grid, the plurality of direct-current boosting units boost the first direct-current voltage to obtain a second direct-current voltage, so that the second direct-current voltage meets the output power of the high-power inverter, then the second direct-current voltage is inverted through the inverting unit and converted into a first alternating-current voltage, the control unit controls the alternating-current processing unit to process the first alternating-current voltage to obtain a second alternating-current voltage, and the second alternating-current voltage output by the high-power inverter meets the use requirement;
2. the primary winding of the transformer is connected in parallel, so that the first direct-current voltage can be continuously modulated and boosted, the first direct-current voltage of the primary winding of the transformer is increased, and meanwhile, the secondary winding of the transformer is connected in series, so that the output power of the first direct-current voltage can be increased, the output power of the high-power inverter is met, and the use requirement of the high-power inverter is further met.
Drawings
Fig. 1 is a block diagram of the structure of an embodiment of the present application.
Fig. 2 is a schematic circuit diagram for showing a dc boost unit according to an embodiment of the present application.
Fig. 3 is a schematic circuit diagram for showing a voltage regulator subunit according to an embodiment of the present application.
Fig. 4 is a schematic circuit diagram for a second voltage sampling unit according to an embodiment of the present application.
Description of reference numerals: 1. a direct current boosting unit; 11. a push-pull subunit; 2. an inversion unit; 3. an alternating current processing unit; 31. a first filtering subunit; 32. a voltage stabilizing subunit; 321. a first modulation module; 322. a second modulation module; 323. a third modulation module; 324. a fourth modulation module; 33. a second filtering subunit; 34. an electromagnetic compatibility subunit; 4. a control unit; 5. a first limit voltage sampling unit; 6. a second voltage sampling unit; 7. a signal amplifying unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-4 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application discloses a high-power inverter combined by multiple transformers. Referring to fig. 1 and 2, the high power inverter includes an inverter unit 2, an ac processing unit 3, a control unit 4, and a plurality of dc boost units 1; the input ends of the direct current boosting units 1 are connected in parallel to an external direct current power supply end, and the output ends of the direct current boosting units 1 are connected in series to the input end of the inversion unit 2.
In this embodiment, taking the number of the dc boost units 1 as three as an example, that is, the dc boost unit 1 includes a first dc boost unit, a second dc boost unit and a third dc boost unit, the internal connection structures of the first dc boost unit, the second dc boost unit and the third dc boost unit are the same, taking the first dc boost unit as an example:
the first direct current boosting unit comprises a transformer T and a push-pull subunit 11; the power input end of the push-pull subunit 11 is connected to an external direct current power supply end, the output end of the push-pull subunit 11 is connected to the primary winding of the transformer T, and the control end of the push-pull subunit 11 is connected to the output end of the control unit 4; the center tap of the transformer T is connected to the external dc power supply terminal, and the secondary winding of the transformer T is connected to the input terminal of the inverter unit 2. The number of the primary windings of the transformer is two, the primary windings are respectively a first primary winding and a second primary winding, and one end of the first primary winding is coupled with one end of the second primary winding.
Specifically, the push-pull subunit 11 includes a resistor R14, a resistor R16, a resistor R17, a resistor 86, a resistor R15, a resistor R23, a resistor R25, a resistor R26, a resistor R1, a capacitor C7, a diode D1, a diode D2, a first switching device Q1, and a second switching device Q3; the first switching element Q1 and the second switching element include, but are not limited to, a triode, an MOS transistor, a combination of a triode and a logic gate, and the like, and in the present application, the first switching element Q1 and the second switching element Q2 are both shown as N-channel MOS transistors; one end of the resistor R1 is connected to an external dc power supply terminal, the other end of the resistor R1 is connected to the cathode of the diode D1 and the cathode of the diode D2, the capacitor C7 is connected in parallel to both ends of the resistor R1, the anode of the diode D1 is connected to the drain of the first switching element Q1, the drain of the first switching element Q1 is connected to one end of the resistor R86 and the ground terminal GND, the other end of the resistor R86 is connected to one end of the resistor R14, the other end of the resistor R14 is connected to the control unit 4, the gate of the first switching element Q1 is connected to one end of the resistor R16 and one end of the resistor R17, the other end of the resistor R17 is connected to the ground terminal GND, the other end of the resistor R16 is connected to the control unit 4, the drain of the first switching element Q1 is connected to one end of the first primary winding, and the center tap of the first primary winding is connected to the external dc power supply terminal.
An anode of the diode D2 is connected to a drain of the second switching element Q3, a source of the second switching element Q3 is connected to one end of the resistor R26 and the ground GND, respectively, the other end of the resistor R26 is connected to one end of the resistor R23, the other end of the resistor R23 is connected to the control unit 4, a gate of the second switching element Q3 is connected to one end of the resistor R15 and one end of the resistor R25, respectively, the other end of the resistor R15 is connected to the ground GND, the other end of the resistor R25 is connected to the control unit 4, a drain of the second switching element Q3 is connected to one end of the first primary winding, and a source of the second switching element Q3 is connected to one end of the second primary winding.
When the control unit 4 outputs a driving signal, if the driving signal drives the first switching element Q1 to be turned on, the driving signal controls the second switching element Q2 to be turned off; if the driving signal drives the first switching element Q1 to be turned off, the driving signal controls the second switching element Q2 to be turned on at the moment, the duty ratio of the primary winding of the transformer T is changed by adjusting the turn-on time of the first switching element Q1 or the second switching element Q2 by using the driving signal, so that the input voltage input to the primary winding of the transformer T is increased, and the high-power output of the secondary winding of the transformer T is realized.
In the present embodiment, the center taps of the primary windings of the three transformers T are all connected in parallel to the external dc power supply terminal, and the secondary windings of the three transformers T are sequentially connected in series and connected to the inverter unit 2.
When the output power of the transformer T needs to be adjusted, the voltage of the primary winding of the transformer T can be adjusted by adjusting the duty ratio of the corresponding dc boost unit 1, so as to adjust the output power of the transformer T and indirectly adjust the output power of the high-power inverter.
Further, in order to adjust the duty ratio of the primary winding of the transformer T more quickly, a third switching element Q2 is connected in parallel to the drain and source of the first switching element Q1, and a fourth switching element Q4 is connected in parallel to the drain and source of the second switching element Q3, wherein the first switching element Q1 and the third switching element Q2 are both turned on at the same time, and the second switching element Q3 and the third switching element Q4 are both turned on at the same time.
In the present application, the second switching element Q3 and the third switching element Q4 are both N-channel MOS transistors.
In the present embodiment, a fuse F and a capacitor C1 are connected in series between dc boost unit 1 and an external dc power supply terminal to protect dc boost unit 1.
Referring to fig. 1, 3 and 4, as an alternative implementation manner of this embodiment, the inverting unit 2 includes a capacitor C17, a capacitor C18 and a plurality of inverting bridges; one end of a capacitor C17 is connected to one end of the secondary winding of the transformer T, the other end of the capacitor C17 is connected to the first bridge arm of the inverter bridge, a capacitor C18 is connected in parallel with the capacitor C17, the second bridge arm of the inverter bridge is connected to the secondary winding of the transformer T, and the third bridge arm and the fourth bridge arm of the inverter bridge are both connected with the alternating current processing unit 3.
After the dc boost unit 1 boosts the first dc voltage input by the external dc power supply, the inverter bridge inverts the second dc voltage to obtain the first ac voltage, thereby completing the dc-to-ac conversion.
As an optional implementation manner of this embodiment, the ac processing unit 3 includes a first filtering subunit 31, a voltage-stabilizing subunit 32, a second filtering subunit 33, and an electromagnetic compatibility subunit 34; the input end of the first filtering subunit 31 is connected to the output end of the inverter unit 2, the output end of the first filtering subunit 31 is connected to the input end of the voltage stabilizing subunit 32, the output end of the voltage stabilizing subunit 32 is connected to the input end of the second filtering subunit 33, the output end of the second filtering subunit 33 is connected to the input end of the electromagnetic compatibility subunit 34, and the output end of the electromagnetic compatibility subunit 34 is connected to the output end AC of the high-power inverter.
As an alternative implementation of the present embodiment, the first filtering subunit 31 includes a resistor R33, a resistor R34, a capacitor C21, a capacitor C19, and a capacitor C20; one end of the resistor R33 is connected to the fourth leg of the inverter bridge, the other end of the resistor R33 is connected to one end of the resistor R34, the other end of the resistor R34 is connected to the third leg of the inverter bridge, the capacitor C21, the capacitor C19 and the capacitor C20 are all connected in parallel between the third leg and the fourth leg of the inverter bridge, and the third leg of the inverter bridge is connected to the ground GND.
When the inverter bridge converts the second dc voltage into the first ac voltage, the capacitor C21, the capacitor C19, and the capacitor C20 filter the first ac voltage, reduce noise in the first ac voltage, and input the first ac voltage into the voltage stabilizing subunit 32.
Specifically, in order to adapt to the high power output of the high power inverter, the number of the voltage stabilizing sub-units 32 needs to be adjusted, for example, a voltage with a power of 50KW is output, in this case, one voltage stabilizing sub-unit 32 is needed, and a voltage with a power of 100KW is output, in this case, two voltage stabilizing sub-units 32 are needed. In this embodiment, a voltage regulator subunit is shown.
As an optional implementation manner of this embodiment, the voltage regulation subunit 32 includes a capacitor C31, a resistor C41, a capacitor C96, a capacitor C27, a first modulation module 321, a second modulation module 322, a third modulation module 323, and a fourth modulation module 324, where the first modulation module 321 and the second modulation module 322 are arranged in series, the third modulation module 323 and the fourth modulation module 324 are arranged in series, and the first modulation module 321 and the second modulation module 322 are arranged in parallel, the first modulation module 321 and the third modulation module 323 are arranged in an opposite direction, the second modulation module 322 and the fourth modulation module 324 are arranged in an opposite direction, and internal connection structures of the first modulation module 321, the second modulation module 322, the third modulation module 323, and the fourth modulation module 324 are the same, which is exemplified here by the first modulation module 321.
A first output terminal VS1 of the voltage regulator subunit 32 is arranged between the third modulation module 323 and the fourth modulation module 324, a second output terminal VS2 of the voltage regulator subunit 32 is arranged between the first modulation module 321 and the second modulation module 322, one end of the capacitor C31 is connected to one end of the first filter subunit 31, the other end of the capacitor C31 is connected to one end of the resistor R41, the other end of the resistor R41 is connected to the second output terminal VS2 of the voltage regulator subunit 32, one end of the capacitor C27 is connected to the ground GND, the other end of the capacitor C27 is connected to one end of the resistor R96, and the other end of the resistor R96 is connected to the first output terminal VS1 of the voltage regulator subunit 32.
The first modulation module 321 includes a resistor 40, a resistor R97, a resistor R98, a diode D21, and a fifth switching device Q17; the fifth switching element Q17 includes, but is not limited to, a transistor, a MOS transistor, a combination of a transistor and a logic gate, and the like, and in this application, the fifth switching element Q17 is shown as an N-channel MOS transistor.
One end of the capacitor C31 is connected to the output end of the first filtering subunit 31 and the drain of the fifth switching element Q17, the gate of the fifth switching element Q17 is connected to one end of the resistor R40, one end of the resistor R97 and one end of the resistor R98, the other end of the resistor R40 is connected to the source of the fifth switching element Q17 and the second output end VS2 of the voltage stabilizing subunit 32, the other end of the resistor R98 is connected to the anode of the diode D21, and the other end of the resistor R97 is connected to the cathode of the diode D21 and the output end of the control unit 4.
In this embodiment, the fifth switching element Q17 in the first modulation module 321 and the seventh switching element Q22 in the third modulation module 323 are a pair of transistors, and are turned on or off simultaneously; the sixth switching element Q20 in the second modulation module 322 and the eighth switching element Q24 in the fourth modulation module 324 are a pair of transistors, and are turned on or off at the same time.
When the first ac voltage processed by the first filtering subunit 31 needs to be stabilized, the control unit 4 outputs a driving signal to control the fifth switching element Q17, the sixth switching element Q20, the seventh switching element Q22, and the eighth switching element Q24 to be turned on in pairs, that is, the fifth switching element Q17 and the seventh switching element Q22 are turned on simultaneously, and the sixth switching element Q20 and the eighth switching element Q24 are turned off, at this time, the first modulation module 321 and the third modulation module 323 perform pulse width modulation on the first ac voltage, so as to change the duty ratio of the first ac voltage, and further, the first ac voltage is more stable.
In this embodiment, when the first modulation module 321 and the third modulation module 323 are turned on, the second modulation module 322 and the fourth modulation module 324 are turned off, and when the second modulation module 322 and the fourth modulation module 324 are turned on, the first modulation module 321 and the third modulation module 323 are turned off, and are sequentially turned on and medium, so that the modulation frequency can be increased, and the first ac voltage can be modulated more quickly.
As an optional implementation manner of this embodiment, the voltage regulation subunit 32 is further connected to a first limit voltage sampling unit 5, and an output end of the first limit voltage sampling unit 5 is connected to an input end of the control unit 4.
The first limit voltage sampling unit 5 includes a plurality of sampling resistors R90, and the sampling resistors R90 perform a short circuit test on the first ac voltage modulated by the voltage stabilizing subunit 32 to obtain a limit value of the first ac voltage, so that the limit value of the first ac voltage is input into the control unit 4, and the control unit 4 can modify a driving signal for driving the voltage stabilizing subunit 32 according to the limit value of the first ac voltage, thereby reducing the possibility of damage to the high-power inverter.
As an alternative implementation manner of this embodiment, the second filtering subunit 33 includes an inductor L1 and a capacitor C40, one end of the inductor L1 is connected to the second output VS2 of the voltage stabilizing subunit 32, and the other end of the inductor L1 is connected to one end of the capacitor C40 and the input end of the electromagnetic compatibility subunit 34, respectively.
Specifically, the inductor L1 and the capacitor C40 form a low-pass filter, which filters the first ac voltage to filter out a sinusoidal ac voltage in the first ac voltage, so that the first ac voltage can be used.
As an alternative implementation manner of this embodiment, the electromagnetic compatibility subunit 34 includes a plurality of excitation coils LF, an input end of the excitation coils LF is connected to an output end of the second filtering subunit 33, and an output end of the excitation coils LF is connected to the output end AC of the high-power inverter.
Specifically, the exciting coil LF can suppress radiation generated in the first ac voltage, reduce electromagnetic interference received by the high-power inverter, and output the second ac voltage.
As an optional implementation manner of this embodiment, the output end of the electromagnetic compatibility subunit 34 is further connected to a second voltage sampling unit 6, and the output end of the second voltage sampling unit 6 is connected to the control unit 4.
The second voltage sampling unit 6 includes a control chip U1, a capacitor C41 and a capacitor C25, the first pin, the second pin, the third pin and the fourth pin of the control chip U1 are all connected to the electromagnetic compatibility subunit 34, the fifth pin of the control chip U1 is connected to the ground terminal GND, the seventh pin of the control chip U1 is connected to the control unit 4, the eighth pin of the control chip U1 is connected to the reference voltage input terminal VCC, and the capacitor C41 and the capacitor C25 are both connected in parallel to the fifth pin and the eighth pin of the control chip U1.
The control chip U1 is a voltage sampling chip, and is not described herein again.
After the second alternating voltage is obtained, the second alternating voltage needs to be sampled, that is, the second alternating voltage is subjected to voltage sampling through the control chip U1 to obtain a sampled voltage, and the sampled voltage is transmitted to the control unit 4, so that the first alternating voltage output by the high-power inverter is sampled and monitored in real time.
As an optional implementation manner of this embodiment, a signal amplifying unit 7 is disposed between the control unit 4 and the second voltage sampling unit 6, an input end of the signal amplifying unit 7 is connected to the seventh pin of the control chip U1, and an output end of the signal amplifying unit 7 is connected to an input end of the control unit 4.
Specifically, the signal amplifying unit 7 includes a capacitor C39, a resistor R55, a resistor R56, a resistor R57, a resistor R58, and an amplifier U2, one end of the capacitor C39 is connected to the seventh pin of the control chip U1, the other end of the capacitor C39 is connected to one end of the resistor R55, the non-inverting input end of the amplifier U2, and one end of the resistor R56, respectively, the other end of the resistor R55 is connected to the reference voltage input terminal VCC, the other end of the resistor R56 is connected to the ground terminal GND, the inverting input end of the amplifier U2 is connected to one end of the resistor R58, the other end of the resistor R58 is connected to the ground terminal GND, the output end of the amplifier U2 is connected to the control unit 4, and the resistor R57 is connected in series to the output end and the inverting input end of the amplifier U2 to feed back the amplifier U2, thereby increasing the sampling voltage output by the amplifier U2 and further making the sampling voltage received by the control unit 4 more accurate.
The implementation principle of the multi-transformer combined high-power inverter in the embodiment of the application is as follows: when a high-power voltage needs to be output, the plurality of dc boosting units 1 boost a first dc voltage input from an external dc power supply terminal to output the first dc voltage reaching high power, that is, the control unit 4 outputs a driving signal to control the push-pull subunit 11 to operate, pulse-width-modulates the first dc voltage input to the primary winding of the transformer T, changes the duty ratio of the first dc voltage, so as to boost the first dc voltage through the transformer T to obtain a second dc voltage, and then converts the second dc voltage into a first ac voltage through the inversion action of the inversion unit 2, the first ac voltage is filtered by the first filter subunit 31 to filter noise waves in the first ac voltage, and then the first ac voltage is more stable through the pulse-width modulation of the voltage stabilizing subunit 32, and transmits the stabilized first ac voltage to the second filter subunit 33, the second filter subunit 33 filters out a sinusoidal ac voltage of the first ac voltage, and then the radiation-suppression action of the electromagnetic compatibility subunit 34 reduces the influence of the first ac voltage, so as to make the second ac voltage compatible with the electromagnetic compatibility inverter output the second ac voltage, thereby making the second ac inverter compatible with the high-power inverter.
The embodiment of the application also provides a power generation system, which comprises power generation equipment and a high-power inverter electrically connected with the power generation equipment.
In this embodiment, the power generation equipment is new energy power generation equipment adopting photovoltaic power generation or wind power generation, and because the power generated by new energy power generation is direct current, a high-power inverter is required to invert the direct current, so that the new energy power generation can be carried out and enters the power grid, and the requirement of the power grid is met.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (9)
1. A high-power inverter combined with multiple transformers is characterized by comprising a direct current boosting unit (1), an inverting unit (2), an alternating current processing unit (3) and a control unit (4); the number of the direct current boosting units (1) is multiple;
the power input ends of the direct current boosting units (1) are connected to an external direct current power supply end, the control ends of the direct current boosting units (1) are connected to the output end of the control unit (4), the power output ends of the direct current boosting units (1) are connected to the input end of the inversion unit (2), the output end of the inversion unit (2) is connected to the input end of the alternating current processing unit (3), and the output end of the alternating current processing unit (3) is connected to the input end of the control unit (4) and the alternating current output end of the inverter respectively;
the control unit (4) is used for outputting a driving signal to control the direct current boosting unit (1) to boost;
the direct current boosting unit (1) is used for receiving the driving signal and boosting a first direct current voltage of the external direct current power supply end according to the driving signal to obtain a second direct current voltage;
the inversion unit (2) is used for inverting the second direct-current voltage to obtain a first alternating-current voltage;
the alternating current processing unit (3) is used for stabilizing the first alternating current voltage to obtain a second alternating current voltage and outputting the second alternating current voltage;
the control unit (4) is further used for changing the output driving signal according to the second alternating voltage so as to enable the alternating current processing unit (3) to output high-power voltage.
2. The multi-transformer combined high-power inverter according to claim 1, wherein the dc boost unit (1) comprises a transformer T and a push-pull subunit (11), a control terminal of the push-pull subunit (11) is connected to an output terminal of the control unit (4), a power input terminal of the push-pull subunit (11) is connected to the external dc power supply terminal, a power output terminal of the push-pull subunit (11) is connected to a primary winding of the transformer T, and a secondary winding of the transformer is connected to the ac processing unit (3);
the push-pull subunit (11) is used for performing pulse width modulation on the direct-current voltage of the primary winding of the transformer T and increasing the direct-current voltage of the primary winding of the transformer T.
3. A multi-transformer combined high-power inverter according to claim 2, characterized in that the primary windings of a plurality of said transformers are connected in parallel to said external dc supply terminals, and the secondary windings of said transformers are connected in series and electrically connected to said ac processing unit (3).
4. The multi-transformer combined high-power inverter according to claim 1, wherein the ac processing unit (3) comprises a first filtering subunit (31) and a voltage stabilizing subunit (32), an input end of the first filtering subunit (31) is connected to an output end of the inverting unit (2), an output end of the first filtering subunit (31) is connected to an input end of the voltage stabilizing subunit (32), and an output end of the voltage stabilizing subunit (32) is connected to an ac output end of the high-power inverter;
the first filtering subunit (31) is used for filtering out noise waves of the first alternating voltage;
the voltage stabilizing subunit (32) is used for stabilizing the first alternating voltage, so that the first alternating voltage is more stable.
5. The multi-transformer combined high-power inverter according to claim 4, wherein the AC processing unit (3) further comprises a second filtering subunit (33) and an electromagnetic compatibility subunit (34), an input terminal of the second filtering subunit (33) is connected to an output terminal of the voltage stabilizing subunit (32), an output terminal of the second filtering subunit (33) is connected to an input terminal of the electromagnetic compatibility subunit (34), and an output terminal of the electromagnetic compatibility subunit (34) is connected to an AC output terminal of the inverter;
the second filtering subunit (33) is configured to perform low-pass filtering on the first alternating voltage to obtain a sinusoidal alternating voltage of the first alternating voltage;
the electromagnetic compatibility subunit (34) is used for suppressing radiation generated by the first alternating voltage and realizing electromagnetic compatibility.
6. The multi-transformer combined high power inverter of claim 1, further comprising:
and the first limit voltage sampling unit (5) is connected to the alternating current processing unit (3) and the control unit (4) and is used for sampling the short-circuit limit voltage of the first alternating current voltage and outputting the short-circuit limit voltage to the control unit (4).
7. The multi-transformer combined high power inverter of claim 1, further comprising:
a second voltage sampling unit (6) connected to the AC processing unit (3) and the control unit (4); the voltage sampling circuit is used for carrying out real-time voltage sampling on the first alternating-current voltage output by the alternating-current processing unit (3) to obtain a sampling voltage, and outputting the sampling voltage to the control unit (4).
8. The multi-transformer combined high-power inverter according to claim 7, wherein a signal amplifying unit (7) is electrically connected between the second voltage sampling unit (6) and the control unit (4); the signal amplification unit (7) is used for amplifying the sampling voltage.
9. A power generation system comprising a power generation plant and a multi-transformer combined high power inverter as claimed in any one of claims 1 to 8.
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