WO2023165253A1 - 一种微型逆变器 - Google Patents
一种微型逆变器 Download PDFInfo
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- WO2023165253A1 WO2023165253A1 PCT/CN2022/144048 CN2022144048W WO2023165253A1 WO 2023165253 A1 WO2023165253 A1 WO 2023165253A1 CN 2022144048 W CN2022144048 W CN 2022144048W WO 2023165253 A1 WO2023165253 A1 WO 2023165253A1
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- micro
- inverter
- bridge arm
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- conversion
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 55
- 238000004804 winding Methods 0.000 claims description 26
- 230000009466 transformation Effects 0.000 claims description 22
- 230000002457 bidirectional effect Effects 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000010363 phase shift Effects 0.000 claims description 7
- 238000004146 energy storage Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Classifications
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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
- H02M7/53871—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 with automatic control of output voltage or current
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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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
Definitions
- This application relates to the technical field of power electronics, in particular to a micro-inverter.
- micro-inverters can realize module-level MPPT (Maximum Power Point Tracking, maximum power point tracking), the power generation between each photovoltaic module does not affect each other, and there is no short-board effect of modules connected in series, partial shading and orientation Inconsistency will not affect the power generation of the entire string of modules, and it can achieve module-level operation and maintenance, so it has received widespread attention.
- MPPT Maximum Power Point Tracking, maximum power point tracking
- an inverter In practical applications, if an inverter is configured for a single module, the cost per watt of the system will be high; therefore, in order to reduce the cost per watt of the system, a 1-to-2 flyback micro-inverter is provided in the prior art
- the inverter scheme whose topological structure is shown in Figure 1, can realize the inverter output for two photovoltaic modules PV1 and PV2, and improve the power density of the system.
- the solution shown in Figure 1 requires the use of multiple high-frequency transformers, resulting in a large overall volume and high cost; moreover, this solution belongs to a two-stage conversion structure, and the front-stage conversion link uses a flyback converter for boosting the voltage.
- the H-bridge is used for inverter in the post-stage conversion link, and the conversion efficiency of this two-stage conversion structure is low.
- the invention provides a micro-inverter to reduce volume, reduce cost and improve conversion efficiency.
- the present invention provides the following technical solutions:
- the first aspect of the present invention provides a micro-inverter, including: a control unit, a transformer, a secondary bridge arm, and N conversion branches; N is an integer greater than 1; wherein,
- each of the conversion branches are respectively used as the input ends of the micro-inverter and connected to corresponding DC sources or loads;
- each transformation branch is cascaded in sequence, and the two ends after cascading are connected to the input end of the secondary bridge arm through the transformer;
- the output end of the secondary bridge arm is used as the output end of the micro-inverter
- the secondary bridge arm and each of the conversion branches are controlled by the control unit.
- the transformer is a high-frequency double-winding transformer.
- the primary winding of the transformer is connected to the two ends of the cascaded output ends of each transformation branch through a first inductor; and/or,
- the secondary winding of the transformer is connected to the input end of the secondary bridge arm through a second inductor.
- the first inductance is independent of the primary winding, or the first inductance is a primary leakage inductance integrated in the transformer;
- the second inductance is independent of the secondary winding, or the second inductance is a secondary leakage inductance integrated in the transformer.
- the secondary bridge arm includes: two bidirectional switches and two output side capacitors;
- the two bidirectional switches are connected in series, the two output-side capacitors are connected in series, and the two series-connected branches are connected in parallel between the two poles of the output end of the secondary bridge arm;
- connection point between the two bidirectional switches and the connection point between the two output side capacitors serve as two poles of the input end of the secondary bridge arm respectively.
- the bidirectional switch includes: two switch tubes connected in reverse series.
- the conversion branch includes: an H-bridge circuit and an input-side capacitor;
- Both ends of the input-side capacitor and the two poles of the DC side of the H-bridge circuit are connected to the two poles of the input end of the conversion branch;
- the two ends of the AC side of the H-bridge circuit serve as two poles of the output end of the conversion branch.
- control unit controls each of the H-bridge circuits independently of each other.
- phase shift angle between the H-bridge circuit and the secondary bridge arm is greater than zero, the energy in the H-bridge circuit flows from the DC side to the AC side;
- control unit controls the output ends of the corresponding transformation branches to be short-circuited.
- control unit is configured to control when the two poles of the output terminal of the conversion branch are short-circuited, specifically to control at least two of the four switch tubes in the H-bridge circuit to pass through.
- each input end of the micro-inverter is respectively connected to a photovoltaic module or an energy storage device.
- it also includes: a grid-side filter arranged between the output end of the secondary bridge arm and the output end of the micro-inverter.
- the same transformer is used to connect the secondary bridge arm, which avoids the need for N transformers in the prior art; and, N
- the decoupling of the control can be realized by cascading the transformation branches, which avoids the need for additional decoupling equipment for each branch; thus reducing the size and cost.
- each DC source or load only needs to undergo one-stage conversion to realize AC grid connection. Compared with the two-stage conversion structure in the prior art, the loss in the conversion process is reduced and the conversion efficiency is improved.
- Fig. 1 is a schematic structural diagram of a micro-inverter provided by the prior art
- FIG. 2 is a schematic structural diagram of a micro-inverter provided by an embodiment of the present invention.
- Fig. 3a, Fig. 3b and Fig. 3c are respectively schematic diagrams of three installation positions of the inductor in the micro-inverter provided by the embodiment of the present invention.
- FIG. 4 is another structural schematic diagram of a micro-inverter provided by an embodiment of the present invention.
- Fig. 5 is the circuit diagram of the micro-inverter provided by the embodiment of the present invention.
- FIG. 7 is a schematic diagram of a simplified topology model of a micro-inverter provided by an embodiment of the present invention.
- Fig. 8 is a signal waveform diagram of the micro-inverter provided by the embodiment of the present invention.
- the term "comprises”, “comprises” or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus.
- an element defined by the phrase “comprising a " does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.
- the invention provides a micro-inverter to reduce volume, reduce cost and improve conversion efficiency.
- the micro-inverter includes: a control unit (not shown), a transformer 102, a secondary bridge arm 103 and N conversion branches 101; N is an integer greater than 1; wherein:
- each transformation branch 101 are respectively used as each input end of the micro-inverter, and are connected to corresponding DC sources or loads. Specifically, they can be connected to DC sources such as photovoltaic modules, or can be connected to energy storage devices, such as batteries, etc.
- a device that switches roles between source and load taking a battery as an example, if it is in a discharging state, it is equivalent to a DC source, and if it is in a charging state, it is equivalent to a load. That is to say, the input terminal and the output terminal of the micro-inverter are only described by taking the state of being connected to a DC source as an example, and the current direction of the micro-inverter is not limited.
- each transformation branch 101 The output terminals of each transformation branch 101 are cascaded in sequence, and the two ends after cascading are connected to the input terminal of the secondary bridge arm 103 through the transformer 102 .
- the transformer 102 can be a high-frequency double-winding transformer; at this time, it specifically includes: an iron core, a primary winding and a secondary winding; moreover, the primary winding can specifically be connected to each transformation branch through the first inductor L1
- the two ends after the output end of circuit 101 is cascaded (as shown in Figure 3a); or, the input end of the secondary bridge arm 103 is connected by its secondary winding through the second inductance L2 (as shown in Figure 2 and Figure 3b ); or, its primary winding is connected to the two ends of the cascaded output terminals of each conversion branch 101 through the first inductance L1, and at the same time, its secondary winding is connected to the input of the secondary bridge arm 103 through the second inductance L2 end (as shown in Figure 3c).
- first inductance L1 and the second inductance L2 may exist in the form of independent inductances, that is, they are independently arranged on one side of the transformer 102; or, the second inductance L2 may also be integrated in the transformer 102, It exists in the form of secondary side leakage inductance; and the first inductance L1 can be integrated in the transformer 102 and exists in the form of primary side leakage inductance; it depends on the specific application environment and is within the scope of protection of this application Inside.
- the output terminal of the secondary bridge arm 103 serves as the output terminal of the micro-inverter.
- the output end of the micro-inverter can be connected to the power grid through an external filter, or a corresponding grid-side filter 104 can also be provided inside the micro-inverter, which is arranged on the secondary bridge arm Between the output end of 103 and the output end of the micro-inverter, specifically, it may be an LC filter, but it is not limited thereto; all are within the scope of protection of the present application.
- Each DC source realizes the single-stage DC-to-AC conversion through the corresponding conversion branch 101; the output end of each conversion branch 101, that is, the AC side, is cascaded, and the boost and isolation are realized through the transformer 102;
- the second inductance L2 on the side changes the phase of the electric energy on the secondary winding and transmits it to the input terminal of the secondary bridge arm 103 , and then adjusts it to AC power for grid connection through the secondary bridge arm 103 .
- the current transmission direction is opposite, and the voltage of the primary side of the transformer 102 is borne by each conversion branch 101 in cascade connection, and each conversion branch 101 performs power conversion respectively to provide electric energy for the corresponding load.
- each DC source or load only needs to be transformed by its transformation branch 101 to achieve AC grid connection.
- the loss in the conversion process is reduced, and the conversion efficiency is improved.
- after cascading the N transforming branches 101 in the main circuit they share the same transformer 102 for AC output, which reduces the number of transformers compared to the existing technology that requires N transformers 102, thereby reducing the miniature The size of the inverter and the system cost; moreover, each conversion branch 101 shares structural components such as the transformer 102, the secondary inductor L2, and the secondary bridge arm 103, which improves the power density and reduces the cost per watt of the system.
- the micro-inverter provided in this embodiment performs energy coupling by cascading multiple conversion branches 101, and does not increase the primary winding in the transformer 102 when facing an increase in the number of input ports;
- this cascaded form can also be used to realize the independent control of the DC side power between the conversion branches 101, that is, the independent control of the power magnitude and the current direction of each conversion branch 101 can be realized, thereby realizing the
- the decoupling of the control avoids the need for various inductances in the prior art; therefore, compared with the above scheme of multiple primary windings, this embodiment reduces the number of windings and inductances, and reduces the volume of the transformer, so that Reduce system cost.
- FIG. 4 shows a specific topology example of the micro-inverter, wherein:
- the secondary bridge arm 103 includes: two bidirectional switches K1 and K2, and two output capacitors C2 and C3.
- the two bidirectional switches K1 and K2 are connected in series, the two output side capacitors C2 and C3 are connected in series, and the two series connected branches are connected in parallel between the two poles of the output end of the secondary bridge arm 103 .
- connection point B between the two bidirectional switches K1 and K2, and the connection point B' between the two output side capacitors C2 and C3 are respectively used as the two poles of the input end of the secondary bridge arm 103; in FIG. 4, the leakage inductance As an example, the inductance independent of the transformer 102 is not shown.
- the bidirectional switches K1 and K2 may respectively include: two reversely connected switch tubes in series.
- the bidirectional switch K1 includes two NMOS (N-Metal-Oxide-Semiconductor, N-type metal-oxide-semiconductor) transistors S5 and S6 with a common source
- the bidirectional switch K2 includes two transistors with a common source.
- NMOS transistors S7 and S8 In practical applications, two IGBTs (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) with a common emitter can also be used to realize the bidirectional switch, and each IGBT has a corresponding anti-parallel diode.
- other switch tubes can also be used to realize the bidirectional switch, which is not specifically limited here, but depends on the application environment, all of which are within the protection scope of the present application.
- the conversion branch 101 includes: H-bridge circuit (including S1_1, S2_1, S3_1 and S4_1 shown in Figure 5, or, S1_2, S2_2, S3_2 and S4_2, or, S1_N, S2_N, S3_N and S4_N) and input side capacitors (C1_1, C1_2 or C1_N as shown in Figure 5). in:
- Both ends of the input capacitor and the two poles of the DC side of the H-bridge circuit are connected to the two poles of the input end of the conversion branch 101 .
- both ends of the input side capacitor C1_1 and the two poles of the DC side of the H-bridge circuit (including S1_1, S2_1, S3_1 and S4_1) are connected to the two poles of the input end of the first transformation branch 101 connected;
- the two ends of the input side capacitor C1_2 and the two poles of the DC side of the H-bridge circuit including S1_2, S2_2, S3_2 and S4_2
- the two ends of the input side capacitor C1_N and the two poles of the DC side of the H bridge circuit are connected to the input end of the Nth conversion branch 101.
- the primary side of the transformer 102 is cascaded through N H-bridge circuits to realize the access of multiple DC sources or loads; while the secondary bridge arm 103 adopts a bidirectional switch to realize grid-connection.
- FIG. 6 shows the topology of a single-stage dual-input micro-inverter; its main circuit adopts DAB (Dual Active Bridge, dual active bridge)+
- DAB Dual Active Bridge, dual active bridge
- the DC power input by the first photovoltaic module converts the DC voltage into a pulsating voltage through the high-frequency switches of the H-bridge circuit (including S1_1, S2_1, S3_1 and S4_1), and the second photovoltaic module
- the input DC power also undergoes the same conversion process; after that, the two AC pulsating voltages are cascaded and connected to the primary winding of the high-frequency double-winding transformer 102 .
- the primary side voltage of transformer 102 is v p
- the voltage between the two poles B and B' of the input terminal of the secondary side bridge arm 103 is v s
- the current on the secondary side leakage inductance L2 is i L
- the primary and secondary side voltage of transformer 102 is When the transformation ratio is 1:N, the voltage on the primary side is converted to Nvp after being converted to the secondary side. Its topology simplified model is shown in Figure 7. Therefore, the energy transmission can be realized by using the phase difference of the voltage at both ends of the secondary side leakage inductance L2 .
- the switching tubes S5 and S7 in the secondary bridge arm 103 are high-frequency chopping, and S6 and S8 are directly connected; while in the negative half cycle of the grid voltage, the switching tubes S5 and S7 in the secondary bridge arm 103 are directly connected, and S6 and S8 high-frequency chopping, and then the secondary bridge arm 103 converts the output voltage into a pulsating voltage whose envelope is the grid voltage to realize grid connection; the signal waveform is shown in FIG. 8 .
- the control unit will control the phase shift angle between the H-bridge circuit and the secondary bridge arm 103 to be greater than zero, that is The H-bridge circuit is ahead of the secondary bridge arm 103, so that energy flows from the DC side to the AC side.
- the control unit will control the phase shift angle between the H bridge circuit and the secondary bridge arm 103 to be less than zero, that is, the H bridge circuit
- the bridge circuit lags behind the secondary bridge arm 103, so that the energy flows from the AC side to the DC side.
- Each H-bridge circuit can be controlled independently, the equivalent switching frequency in each H-bridge circuit can be multiplied, and multi-level can be realized.
- the DC side power of each H-bridge circuit can be independently controlled, including the independent control of power and current direction. control.
- control unit may control the output terminal of the corresponding transformation branch 101 to be short-circuited.
- control at least two of the four switch tubes in the H-bridge circuit to pass through, for example, to control the upper bridge arms to be turned on and the lower bridge arms to be turned off, or to control the lower bridge arms to be turned on, The upper bridge arms are all disconnected; of course, any three switching tubes or all the switching tubes may be controlled to be turned on.
- the second path is not connected to any equipment or the connected photovoltaic modules are completely blocked, it is necessary to close S1_2 and S3_2 in the second path H-bridge circuit, and S2_2 and S4_2 can be disconnected or closed, or the S2_2 and S4_2 are closed, and S1_2 and S3_2 can be opened or closed, thereby short-circuiting the two poles of the output terminal of the second H-bridge circuit.
- the energy transmission is then controlled by controlling the phase shift angle between the H-bridge circuit in the first H-bridge circuit on the primary side and the bridge arm 103 on the secondary side.
- N is other values, it can be deduced like this; furthermore, in this embodiment, when there is no input in a single channel, by controlling the switching tube action of the H-bridge circuit on the non-access input side, the normal operation of other channels can be realized, eliminating The impact of the non-access input side on the system is eliminated, and the reliability of the system is improved.
- the micro-inverter provided by this embodiment has a relatively low voltage level.
- the voltage of the secondary bridge arm 103 can be 220V, and the input voltage of each H-bridge circuit on the primary side can be 100V.
- its power level It is also relatively low, suitable for occasions with low voltage and power levels.
- the micro-inverter should also be equipped with a corresponding acquisition module to acquire the grid voltage, grid-connected current, and the input voltage and input current of each conversion branch wait.
- each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments.
- the description is relatively simple, and for relevant parts, please refer to the part of the description of the method embodiment.
- the systems and system embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is It can be located in one place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.
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Abstract
Description
Claims (13)
- 一种微型逆变器,其特征在于,包括:控制单元、变压器、副边桥臂及N个变换支路;N为大于1的整数;其中,各个所述变换支路的输入端,分别作为所述微型逆变器的各个输入端,连接相应的直流源或负载;各个所述变换支路的输出端依次级联,级联后的两端通过所述变压器连接所述副边桥臂的输入端;所述副边桥臂的输出端作为所述微型逆变器的输出端;所述副边桥臂及各所述变换支路,均受控于所述控制单元。
- 根据权利要求1所述的微型逆变器,其特征在于,所述变压器为高频双绕组变压器。
- 根据权利要求2所述的微型逆变器,其特征在于,所述变压器的原边绕组,通过第一电感连接各个所述变换支路的输出端级联后的两端;和/或,所述变压器的副边绕组,通过第二电感连接所述副边桥臂的输入端。
- 根据权利要求3所述的微型逆变器,其特征在于,所述第一电感独立于所述原边绕组,或者,所述第一电感为集成于所述变压器中的原边漏感;所述第二电感独立于所述副边绕组,或者,所述第二电感为集成于所述变压器中的副边漏感。
- 根据权利要求1所述的微型逆变器,其特征在于,所述副边桥臂,包括:两个双向开关和两个输出侧电容;两个所述双向开关串联连接,两个所述输出侧电容串联连接,且两个串联后的支路并联连接于所述副边桥臂的输出端两极之间;两个所述双向开关之间的连接点,以及,两个所述输出侧电容之间的连接点,分别作为所述副边桥臂的输入端两极。
- 根据权利要求5所述的微型逆变器,其特征在于,所述双向开关包括:两个反向串联的开关管。
- 根据权利要求1至6任一项所述的微型逆变器,其特征在于,所述变换支路,包括:H桥电路和输入侧电容;所述输入侧电容的两端和所述H桥电路的直流侧两极,均与所述变换支路的输入端两极相连;所述H桥电路的交流侧两端,作为所述变换支路的输出端两极。
- 根据权利要求7所述的微型逆变器,其特征在于,所述控制单元对于各个所述H桥电路的控制相互独立。
- 根据权利要求8所述的微型逆变器,其特征在于,当所述H桥电路与所述副边桥臂之间的移相角大于零时,所述H桥电路中的能量由直流侧流向交流侧;当所述H桥电路与所述副边桥臂之间的移相角小于零时,所述H桥电路中的能量由交流侧流向直流侧。
- 根据权利要求8所述的微型逆变器,其特征在于,若任一所述变换支路的输入端无接入,则所述控制单元控制相应所述变换支路的输出端两极短接。
- 根据权利要求10所述的微型逆变器,其特征在于,所述控制单元用于控制所述变换支路的输出端两极短接时,具体用于控制其所述H桥电路内四个开关管中的至少两个直通。
- 根据权利要求1至6任一项所述的微型逆变器,其特征在于,所述微型逆变器的各个输入端,分别连接光伏组件或者储能设备。
- 根据权利要求1至6任一项所述的微型逆变器,其特征在于,还包括:设置于所述副边桥臂的输出端与所述微型逆变器的输出端之间的网侧滤波器。
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CN101847939A (zh) * | 2009-03-26 | 2010-09-29 | Abb研究有限公司 | 用于控制单相dc/ac转换器的方法和转换器装置 |
CN104078992A (zh) * | 2013-03-31 | 2014-10-01 | 张良华 | 一种储能电压平衡电力电子电能变换系统及其控制方法 |
US20150015072A1 (en) * | 2013-07-12 | 2015-01-15 | Infineon Technologies Austria Ag | Power Converter Circuit and Method |
CN113595431A (zh) * | 2021-08-07 | 2021-11-02 | 青岛大学 | 级联H桥Buck型高频环节单级多输入双向DC/AC变换器 |
CN114553043A (zh) * | 2022-03-04 | 2022-05-27 | 阳光电源股份有限公司 | 一种微型逆变器 |
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CN101847939A (zh) * | 2009-03-26 | 2010-09-29 | Abb研究有限公司 | 用于控制单相dc/ac转换器的方法和转换器装置 |
CN104078992A (zh) * | 2013-03-31 | 2014-10-01 | 张良华 | 一种储能电压平衡电力电子电能变换系统及其控制方法 |
US20150015072A1 (en) * | 2013-07-12 | 2015-01-15 | Infineon Technologies Austria Ag | Power Converter Circuit and Method |
CN113595431A (zh) * | 2021-08-07 | 2021-11-02 | 青岛大学 | 级联H桥Buck型高频环节单级多输入双向DC/AC变换器 |
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