技术领域technical field
本发明属于电力电子变流技术领域，具体涉及一种单相光伏发电变流拓扑。The invention belongs to the technical field of electric power electronic conversion, and in particular relates to a single-phase photovoltaic power generation conversion topology.
背景技术Background technique
功率变流拓扑是将一种电功率转换为另外一种电功率的电能处理电路。在光伏发电系统中，一般要求将光伏组件所产生的直流电能变换成交流电能，这一功能需由某种功率变流拓扑来实现，功率变流拓扑一般是DC-AC变换器、DC-DC变换器或由DC-DC变换器和DC-AC变换器组成的功率电路。Power conversion topology is an electric energy processing circuit that converts one kind of electric power into another kind of electric power. In a photovoltaic power generation system, it is generally required to convert the DC power generated by the photovoltaic module into AC power. This function needs to be realized by a power conversion topology. The power conversion topology is generally a DC-AC converter, DC-DC converter or a power circuit composed of a DC-DC converter and a DC-AC converter.
针对户用型小功率光伏发电系统，光伏组件少，产生的直流电压较低，若直接将电压较低的直流电能转换成交流电能，则交流电压一般不满足并网要求和本地负载对电压的要求。为了将光伏组件输出的直流电能经过逆变后接入电网或供本地交流负载使用，常采用的方法是交流侧接工频变压器或者提高直流电压。若交流侧接工频变压器，则导致光伏变流系统的功率密度低；若提高直流侧电压，一般在直流侧加一级直流升压变换器或者采用足够多光伏组件串联的方法。本发明则摒弃了上述两种方案，在交流侧加一级AC-AC变换器实现升压，以满足并网电压要求或本地交流负载对电压的要求。For household-type low-power photovoltaic power generation systems, there are few photovoltaic modules and the DC voltage generated is low. If the low-voltage DC power is directly converted into AC power, the AC voltage generally does not meet the grid-connected requirements and the local load's requirements for voltage. Require. In order to connect the DC power output by photovoltaic modules to the power grid after inversion or for local AC loads, the commonly used method is to connect the AC side to a power frequency transformer or increase the DC voltage. If the AC side is connected to a power frequency transformer, the power density of the photovoltaic conversion system will be low; if the DC side voltage is increased, a DC boost converter is generally added to the DC side or a method of connecting enough photovoltaic modules in series. The present invention abandons the above two solutions, and adds a first-stage AC-AC converter on the AC side to realize boosting, so as to meet the grid-connected voltage requirement or the voltage requirement of the local AC load.
发明内容Contents of the invention
本发明的目的就是针对户用型光伏发电系统提供一种光伏变流拓扑，特别适合用于直流电压输入较低的光伏发电系统。The purpose of the present invention is to provide a photovoltaic converter topology for household photovoltaic power generation systems, which is especially suitable for photovoltaic power generation systems with low DC voltage input.
本发明的技术解决方案是：一种单相光伏发电变流拓扑，其特征在于：该变流拓扑由单相逆变器和AC-AC变换器组成，单相逆变器的输出端与AC-AC变换器的输入端连接。The technical solution of the present invention is: a single-phase photovoltaic power generation converter topology, which is characterized in that: the converter topology is composed of a single-phase inverter and an AC-AC converter, and the output terminal of the single-phase inverter is connected to the AC - Input connection of the AC converter.
本发明的技术解决方案中所述的单相逆变器包括并联的第一电容支路、第一桥臂和第二桥臂，第一桥臂和第二桥臂均由正向串联的两个开关管组成；还包括由LC串联电路构成的输出支路，输出支路的两端分别连接在第一桥臂和第二桥臂的中间连接点上；输出支路的第二电容两端为逆变器输出端。The single-phase inverter described in the technical solution of the present invention includes a first capacitor branch connected in parallel, a first bridge arm and a second bridge arm, and the first bridge arm and the second bridge arm are formed by two It is composed of two switching tubes; it also includes an output branch composed of an LC series circuit, the two ends of the output branch are respectively connected to the middle connection point of the first bridge arm and the second bridge arm; the two ends of the second capacitor of the output branch are respectively connected. is the output terminal of the inverter.
本发明的技术解决方案中所述的AC-AC变换器包括由两个反向连接的开关管构成的第一支路，由两个反向连接的开关管及第三电容串联构成的第二支路，第一支路与第二支路并联；第二支路的第三电容端与第二电容连接，与第二支路的另一端经第二电感与输出支路的中间连接点连接；第三电容两端为AC-AC变换器输出端。The AC-AC converter described in the technical solution of the present invention includes a first branch composed of two reversely connected switch tubes, a second branch circuit composed of two reversely connected switch tubes and a third capacitor connected in series. Branches, the first branch and the second branch are connected in parallel; the third capacitor end of the second branch is connected to the second capacitor, and the other end of the second branch is connected to the middle connection point of the output branch through the second inductor ; The two ends of the third capacitor are the output ends of the AC-AC converter.
本发明的技术解决方案中所述的单相逆变器的输入端接第一空气开关；AC-AC变换器的输出端接第二空气开关。The input terminal of the single-phase inverter described in the technical solution of the present invention is connected to the first air switch; the output terminal of the AC-AC converter is connected to the second air switch.
本发明采用由单相逆变器和AC-AC变换器组成的单相光伏发电变流拓扑，其中，单相逆变器包括并联的第一电容支路、第一桥臂和第二桥臂，第一桥臂和第二桥臂均由正向串联的两个开关管组成，AC-AC变换器包括由两个反向连接的开关管构成的第一支路，由两个反向连接的开关管及第三电容串联构成的第二支路，第一支路与第二支路并联，逆变器的输出端与AC-AC变换器的输入端连接。在小功率光伏发电系统中，即使光伏组件产生的直流电压较低，经逆变器和AC-AC变换器处理后，输出的交流电压能够满足并网要求和本地负载对电压的要求。本发明中单相逆变器将光伏组件产生的直流电能转换成交流电能，AC-AC变换器将所得到的交流电能升压之后再接入电网或供本地负载使用。本发明独特之处在于先逆变，再进行交流升压，适合于光伏组件产生的直流电压较低（较少光伏组件串联）的应用场合。The present invention adopts a single-phase photovoltaic power generation conversion topology composed of a single-phase inverter and an AC-AC converter, wherein the single-phase inverter includes a parallel first capacitor branch, a first bridge arm and a second bridge arm , both the first bridge arm and the second bridge arm are composed of two switching tubes connected in series in forward direction. The switch tube and the third capacitor are connected in series to form a second branch, the first branch and the second branch are connected in parallel, and the output end of the inverter is connected to the input end of the AC-AC converter. In a low-power photovoltaic power generation system, even if the DC voltage generated by photovoltaic modules is relatively low, the output AC voltage can meet the grid-connected requirements and the voltage requirements of local loads after being processed by inverters and AC-AC converters. In the present invention, the single-phase inverter converts the DC power generated by the photovoltaic module into AC power, and the AC-AC converter boosts the obtained AC power before connecting it to the power grid or for use by local loads. The unique feature of the present invention is that the inverter is performed first, and then the AC voltage is boosted, which is suitable for applications where the DC voltage generated by the photovoltaic modules is relatively low (less photovoltaic modules are connected in series).
附图说明Description of drawings
图1为本发明单相光伏发电变流拓扑。Fig. 1 is the single-phase photovoltaic power generation converter topology of the present invention.
具体实施方式detailed description
现结合附图详细阐述本发明的具体实施方式。The specific embodiment of the present invention will now be described in detail in conjunction with the accompanying drawings.
本发明提出的单相光伏发电变流拓扑如图1所示。单相光伏发电变流拓扑由单相逆变器和AC-AC变换器组成，单相逆变器的输出端与AC-AC变换器的输入端连接。The single-phase photovoltaic power generation converter topology proposed by the present invention is shown in FIG. 1 . The single-phase photovoltaic power conversion topology consists of a single-phase inverter and an AC-AC converter, and the output end of the single-phase inverter is connected to the input end of the AC-AC converter.
单相逆变器包括并联的第一电容支路、第一桥臂和第二桥臂。第一电容支路由第一电容Cin组成，第一电容Cin的正极接于P1点，第一电容Cin的负极接于P2点。第一桥臂由正向串联的第一开关管S1、第二开关管S2组成，第二桥臂由正向串联的第三开关管S3、第四开关管S4组成，第一开关管S1的发射极串接第二开关管S2的集电极，第三开关管S3的发射极串接第四开关管S4的集电极。还包括由LC串联电路构成的输出支路，输出支路由第一电感L1、第二电容Co串联组成，输出支路的两端分别连接在第一桥臂的中间连接点P3和第二桥臂的中间连接点P4上。输出支路的第二电容Co两端连接点P5与P4为逆变器输出端。单相逆变器的输入端接第一空气开关K1，第一空气开关K1的接线柱①、②分别接光伏组件PV的正极和负极，第一空气开关K1的接线柱③、④分别接第一电容Cin的正极和负极。The single-phase inverter includes a first capacitor branch, a first bridge arm and a second bridge arm connected in parallel. The first capacitor branch is composed of the first capacitor Cin, the positive pole of the first capacitor Cin is connected to the point P1, and the negative pole of thefirst capacitorCin is connected to the point P2. The first bridge arm is composed of the first switching tube S1 and the second switching tube S2 connected in series in forward direction, the second bridge arm is composed of the third switching tube S3 and the fourth switching tube S4 in forward series connection, the firstThe emitter of the switching tube S1 is connected in series with the collector of thesecond switching tube S2, and the emitter of thethird switching tube S3 is connected in series with the collector of thefourth switching tube S4. It also includes an output branch composed of an LC series circuit, the output branch is composed of the first inductance L1 and the second capacitor Co in series, and the two ends of the output branch are respectively connected to the middle connection point P3 of the first bridge arm and the secondon the middle connection point P4 of the bridge arm.The connection pointsP5 and P4 of both ends of the second capacitor Co of the output branch are the output terminals of the inverter. The input terminal of the single-phase inverter is connected to the first air switch K1 , the terminals ① and ② of the first air switch K1 are respectively connected to the positive and negative poles of the photovoltaic module PV, and the terminals ③ and ④ of the first air switch K1 Connect the positive pole and the negative pole of the first capacitor Cin respectively.
AC-AC变换器包括由两个反向连接的第五开关管S5、第六开关管S6构成的第一支路，由两个反向连接的第七开关管S7、第八开关管S8及第三电容C1串联构成的第二支路，第一支路与第二支路并联。第二电感L2的一端P6接第五开关管S5和的第七开关管S7集电极，另一端接第二电容Co的端连接点P5。第二支路的第三电容C1外端与第二电容Co连接，与第二支路的另一端经第二电感与输出支路的中间连接点连接；第三电容C1两端连接点P8与P7为AC-AC变换器输出端。第五开关管S5的发射极串接第六开关管S6的发射极，第七开关管S7的发射极串接第八开关管S8的发射极。AC-AC变换器的输出端接第二空气开关K2，第二空气开关K2的接线柱①、②分别接P8点和P7点，第二空气开关K2的接线柱③、④接电网。The AC-AC converter includes a first branch composed of two reversely connected fifth switch tubes S5 and sixth switch tubes S6 , and two reversely connected seventh switch tubes S7 and eighth switch tubes The second branch formed by the tubeS8 and the third capacitorC1 connected in series, the first branch and the second branch are connected in parallel. One terminal P6 of the second inductor L2 is connected to the collectors of the fifth switching transistor S5 and the seventh switching transistor S7 , and the other terminal is connected to the terminal P5 of the second capacitor Co. The outer end of the third capacitorC1 of the second branch is connected to the second capacitor Co, and the other end of the second branch is connected to the middle connection point of the output branch through the second inductor; the third capacitorC1 is connected to two ends P8 and P7 are the output terminals of the AC-AC converter. The emitter of thefifth switch S5 is connected in series with the emitter of the sixth switchS6 , and the emitter of theseventh switch S7 is connected in series with the emitter of theeighth switch S8. The output terminal of the AC-AC converter is connected to the second air switch K2 , the terminals ① and ② of the second air switch K2 are respectively connected to points P8 and P7 , and the terminals ③ and ④ of the second air switch K2 Connect to the grid.
本发明的第一开关管S1、第二开关管S2、第三开关管S3、第四开关管S4、第五开关管S5、第六开关管S6、第七开关管S7和第八开关管S8均采用绝缘栅晶体管（IGBT）单相逆变器包括并联的第一电容支路、第一桥臂和第二桥臂。第一电容支路由第一电容Cin组成，第一电容Cin的正极接于P1点，第一电容Cin的负极接于P2点。第一桥臂由正向串联的第一开关管S1、第二开关管S2组成，第二桥臂由正向串联的第三开关管S3、第四开关管S4组成，第一开关管S1的发射极串接第二开关管S2的集电极，第三开关管S3的发射极串接第四开关管S4的集电极。还包括由LC串联电路构成的输出支路，输出支路由第一电感L1、第二电容Co串联组成，输出支路的两端分别连接在第一桥臂的中间连接点P3和第二桥臂的中间连接点P4上。输出支路的第二电容Co两端连接点P5与P4为逆变器输出端。单相逆变器的输入端接第一空气开关K1，第一空气开关K1的接线柱①、②分别接光伏组件PV的正极和负极，第一空气开关K1的接线柱③、④分别接第一电容Cin的正极和负极。The first switching tube S1 , the second switching tube S2 , the third switching tube S3 , the fourth switching tube S4 , the fifth switching tube S5 , the sixth switching tube S6 , and the seventh switching tube S of the present invention7 and the eighth switching tube S8 both use insulated gate transistors (IGBT) and the single-phase inverter includes a first capacitor branch, a first bridge arm, and a second bridge arm connected in parallel. The first capacitor branch is composed of the first capacitor Cin, the positive pole of the first capacitor Cin is connected to the point P1, and the negative pole of thefirst capacitorCin is connected to the point P2. The first bridge arm is composed of the first switching tube S1 and the second switching tube S2 connected in series in forward direction, the second bridge arm is composed of the third switching tube S3 and the fourth switching tube S4 in forward series connection, the firstThe emitter of the switching tube S1 is connected in series with the collector of thesecond switching tube S2, and the emitter of thethird switching tube S3 is connected in series with the collector of thefourth switching tube S4. It also includes an output branch composed of an LC series circuit, the output branch is composed of the first inductance L1 and the second capacitor Co in series, and the two ends of the output branch are respectively connected to the middle connection point P3 of the first bridge arm and the secondon the middle connection point P4 of the bridge arm.The connection pointsP5 and P4 of both ends of the second capacitor Co of the output branch are the output terminals of the inverter. The input terminal of the single-phase inverter is connected to the first air switch K1 , the terminals ① and ② of the first air switch K1 are respectively connected to the positive and negative poles of the photovoltaic module PV, and the terminals ③ and ④ of the first air switch K1 Connect the positive pole and the negative pole of the first capacitor Cin respectively.
AC-AC变换器包括由两个反向连接的第五开关管S5、第六开关管S6构成的第一支路，由两个反向连接的第七开关管S7、第八开关管S8及第三电容C1串联构成的第二支路，第一支路与第二支路并联。第二电感L2的一端P6接第五开关管S5和的第七开关管S7集电极，另一端接第二电容Co的端连接点P5。第二支路的第三电容C1外端与第二电容Co连接，与第二支路的另一端经第二电感与输出支路的中间连接点连接；第三电容C1两端连接点P8与P7为AC-AC变换器输出端。第五开关管S5的发射极串接第六开关管S6的发射极，第七开关管S7的发射极串接第八开关管S8的发射极。AC-AC变换器的输出端接第二空气开关K2，第二空气开关K2的接线柱①、②分别接P8点和P7点，第二空气开关K2的接线柱③、④接电网。The AC-AC converter includes a first branch composed of two reversely connected fifth switch tubes S5 and sixth switch tubes S6 , and two reversely connected seventh switch tubes S7 and eighth switch tubes The second branch formed by the tubeS8 and the third capacitorC1 connected in series, the first branch and the second branch are connected in parallel. One terminal P6 of the second inductor L2 is connected to the collectors of the fifth switching transistor S5 and the seventh switching transistor S7 , and the other terminal is connected to the terminal P5 of the second capacitor Co. The outer end of the third capacitorC1 of the second branch is connected to the second capacitor Co, and the other end of the second branch is connected to the middle connection point of the output branch through the second inductor; the third capacitorC1 is connected to two ends P8 and P7 are the output terminals of the AC-AC converter. The emitter of thefifth switch S5 is connected in series with the emitter of the sixth switchS6 , and the emitter of theseventh switch S7 is connected in series with the emitter of theeighth switch S8. The output terminal of the AC-AC converter is connected to the second air switch K2 , the terminals ① and ② of the second air switch K2 are respectively connected to points P8 and P7 , and the terminals ③ and ④ of the second air switch K2 Connect to the grid.
本发明的第一开关管S1、第二开关管S2、第三开关管S3、第四开关管S4、第五开关管S5、第六开关管S6、第七开关管S7和第八开关管S8均采用绝缘栅晶体管（IGBT）。The first switching tube S1 , the second switching tube S2 , the third switching tube S3 , the fourth switching tube S4 , the fifth switching tube S5 , the sixth switching tube S6 , and the seventh switching tube S of the present invention7 and the eighth switching tube S8 both use insulated gate transistors (IGBTs).
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610415577.8ACN106026727A (en) | 2016-06-15 | 2016-06-15 | Single-phase photovoltaic power generation converter topology |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610415577.8ACN106026727A (en) | 2016-06-15 | 2016-06-15 | Single-phase photovoltaic power generation converter topology |
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| CN106026727Atrue CN106026727A (en) | 2016-10-12 |
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| CN201610415577.8APendingCN106026727A (en) | 2016-06-15 | 2016-06-15 | Single-phase photovoltaic power generation converter topology |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | Application publication date:20161012 | |
| RJ01 | Rejection of invention patent application after publication |