CN202276295U - Diode clamp type five-level photovoltaic inverter and power supply system employing same - Google Patents
Diode clamp type five-level photovoltaic inverter and power supply system employing same Download PDFInfo
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Abstract
本实用新型公开了一种二极管钳位式五电平光伏逆变器及采用它的供电系统，属于太阳能光伏发电技术领域，它将太阳能光伏电池输出的直流电逆变成交流电，并输送给电网的逆变器，各路直流输入通过升压电路进行独立的最大功率点跟踪控制，充分发挥太阳能电池板的效率，再经过多电平逆变器进行高效的逆变，整个系统发电效率高，注入电网的谐波小，减小了对电网电能质量的影响。其逆变主电路与逆变控制器连接；逆变主电路包括直流母线与三个结构完全相同的桥臂，各桥臂的直流输入端接直流输入，各桥臂的交流输出端与电网连接；逆变器拓扑具有如下特点：开关器件所承受的开关应力dv/dt小，无动态电压共享问题，不需要额外的器件就能实现静态电压均衡。
The utility model discloses a diode-clamped five-level photovoltaic inverter and a power supply system using it, belonging to the technical field of solar photovoltaic power generation. Inverter, each DC input is independently controlled by the maximum power point tracking through the boost circuit to give full play to the efficiency of the solar panel, and then through the multi-level inverter for efficient inversion, the entire system has high power generation efficiency and injection The harmonics of the power grid are small, which reduces the impact on the power quality of the power grid. The inverter main circuit is connected to the inverter controller; the inverter main circuit includes a DC bus and three bridge arms with the same structure, the DC input terminals of each bridge arm are connected to the DC input, and the AC output terminals of each bridge arm are connected to the power grid ; The inverter topology has the following characteristics: the switching stress dv/dt borne by the switching device is small, there is no dynamic voltage sharing problem, and the static voltage balance can be realized without additional devices.
Description
技术领域 technical field
本实用新型涉及一种太阳能光伏发电用逆变器，尤其涉及一种二极管钳位式五电平光伏逆变器及采用它的供电系统。The utility model relates to an inverter for solar photovoltaic power generation, in particular to a diode-clamped five-level photovoltaic inverter and a power supply system using it.
背景技术 Background technique
随着能源和环境问题的日益严重，太阳能、风能等可再生能源发电增长迅速，对大容量功率变换装置的要求也日益增加，其核心部件为大功率逆变器。由于器件可承受电压和电流能力的限制，传统两电平逆变器难以直接实现高压大功率化；同时在高压应用中，两电平逆变器输出电压的dv/dt很大，会导致绝缘问题和严重的电磁干扰。With the increasing seriousness of energy and environmental problems, the power generation of renewable energy such as solar energy and wind energy is growing rapidly, and the requirements for large-capacity power conversion devices are also increasing. The core component is a high-power inverter. Due to the limitation of the device's ability to withstand voltage and current, it is difficult for traditional two-level inverters to directly realize high-voltage and high-power applications; at the same time, in high-voltage applications, the dv/dt of the output voltage of two-level inverters is very large, which will lead to insulation problems and severe electromagnetic interference.
实用新型内容 Utility model content
本实用新型的目的就是为解决上述问题，提供一种二极管钳位式五电平光伏逆变器及采用它的供电系统，它在保留多电平逆变器高效率和高电压利用率优点的基础上，解决其电压应力高的问题，并提供动态电压共享、静态电压均衡等问题的解决方案。The purpose of this utility model is to solve the above problems, to provide a diode-clamped five-level photovoltaic inverter and a power supply system using it, which retains the advantages of high efficiency and high voltage utilization of multi-level inverters Based on this, solve the problem of high voltage stress, and provide solutions to problems such as dynamic voltage sharing and static voltage equalization.
为实现上述目的，本实用新型采用如下技术方案：In order to achieve the above object, the utility model adopts the following technical solutions:
一种二极管钳位式五电平光伏逆变器，它包括逆变主电路和逆变控制器，逆变主电路的开关器件控制信号由逆变控制器提供；所述逆变主电路包括直流母线与三个结构完全相同的桥臂，各桥臂的直流输入端接直流输入，各桥臂的交流输出端与电网连接，其中：A diode-clamped five-level photovoltaic inverter, which includes an inverter main circuit and an inverter controller, the switching device control signal of the inverter main circuit is provided by the inverter controller; the inverter main circuit includes a DC The busbar is connected to three bridge arms with the same structure, the DC input terminal of each bridge arm is connected to the DC input, and the AC output terminal of each bridge arm is connected to the power grid, where:
直流母线由四个电容C1、C2、C3和C4串联而成，即第一电容C1的正极与直流母线的正极连接，负极与第二电容C2的正极连接；第二电容C2的负极与第三电容C3的正极连接；第三电容C3的负极与第四电容C4的正极连接；第四电容C4的负极与直流母线的负极连接。提供五个不同的电平。The DC bus is composed of four capacitors C 1 , C 2 , C 3 and C 4 in series, that is, the positive pole of the first capacitor C 1 is connected to the positive pole of the DC bus, and the negative pole is connected to the positive pole of the second capacitor C 2 ; the second capacitor The negative pole of C2 is connected to the positive pole of the third capacitor C3 ; the negative pole of the third capacitor C3 is connected to the positive pole of the fourth capacitor C4 ; the negative pole of the fourth capacitor C4 is connected to the negative pole of the DC bus. Five different levels are available.
三条桥臂结构相同，每条桥臂包含8个功率开关管(可为绝缘栅双极型晶体管IGBT或大功率晶体管GTR)、8个功率二极管、12个钳位二极管，构成两组串联的开关电路和三组钳位电路。以第一桥臂为例：The three bridge arms have the same structure, and each bridge arm contains 8 power switch tubes (which can be insulated gate bipolar transistor IGBT or high-power transistor GTR), 8 power diodes, and 12 clamping diodes, forming two sets of switches in series circuit and three sets of clamping circuits. Take the first bridge arm as an example:
第一开关电路包含4个功率开关管和4个功率二极管，连接如下：The first switch circuit includes 4 power switch tubes and 4 power diodes, connected as follows:
功率开关管之间连接：Connection between power switch tubes:
第一功率开关管S1的集电极与直流母线的正极连接；The collector of the first power switch tube S1 is connected to the positive pole of the DC bus;
第一功率开关管S1的发射极与第二功率开关管S2的集电极连接；The emitter of the first power switch tube S1 is connected to the collector of the second power switch tube S2 ;
第二功率开关管S2的发射极与第三功率开关管S3的集电极连接；The emitter of the second power switch tube S2 is connected to the collector of the third power switch tube S3 ;
第三功率开关管S3的发射极与第四功率开关管S4的集电极连接；The emitter of the third power switch tube S3 is connected to the collector of the fourth power switch tube S4 ;
第四功率开关管S4的发射极与第五功率开关管S1’的集电极连接；The emitter of the fourth power switch S4 is connected to the collector of the fifth power switch S1 ';
功率开关管与功率二极管连接：The power switch tube is connected to the power diode:
第一功率开关管S1与第一功率二极管D11并联(S1的集电极与D11的阴极连接，S1的发射极与D11的阳极连接)；The first power switch tube S1 is connected in parallel with the first power diode D11 (the collector of S1 is connected to the cathode of D11 , and the emitter of S1 is connected to the anode of D11 );
第二功率开关管S2与第二功率二极管D12并联；The second power switch tube S2 is connected in parallel with the second power diode D12 ;
第三功率开关管S3与第三功率二极管D13并联；The third power switch tube S3 is connected in parallel with the third power diode D13 ;
第四功率开关管S4与第四功率二极管D14并联；The fourth power switch tube S4 is connected in parallel with the fourth power diode D14 ;
第一开关电路包含4个功率开关管和4个功率二极管，连接如下：The first switch circuit includes 4 power switch tubes and 4 power diodes, connected as follows:
第五功率开关管S1’的发射极与第六功率开关管S2’的集电极连接；The emitter of the fifth power switch S 1 ′ is connected to the collector of the sixth power switch S 2 ′ ;
第六功率开关管S2’的发射极与第七功率开关管S3’的集电极连接；The emitter of the sixth power switch S2 ' is connected to the collector of the seventh power switch S3 ';
第七功率开关管S3’的发射极与第八功率开关管S4’的集电极连接；The emitter of the seventh power switch S 3 ′ is connected to the collector of the eighth power switch S 4 ′;
第八功率开关管S4’的发射极与直流母线的负极连接。The emitter of the eighth power switch S 4 ′ is connected to the negative pole of the DC bus.
功率开关管与功率二极管连接：The power switch tube is connected to the power diode:
第五功率开关管S1’与第五功率二极管D21并联；The fifth power switch tube S 1 ′ is connected in parallel with the fifth power diode D 21 ;
第六功率开关管S2’与第六功率二极管D22并联；The sixth power switch tube S2 ' is connected in parallel with the sixth power diode D22 ;
第七功率开关管S3’与第七功率二极管D23并联；The seventh power switch tube S 3 ′ is connected in parallel with the seventh power diode D 23 ;
第八功率开关管S4’与第八功率二极管D24并联。The eighth power switch S 4 ′ is connected in parallel with the eighth power diode D 24 .
两组开关电路串联连接，即，第四功率开关管S4的发射极与第五功率开关管S1’的集电极连接，连接点作为A相输出。开关器件状态不同的情况下，A相输出可能为五个不同的电平。The two sets of switch circuits are connected in series, that is, the emitter of the fourth power switch S4 is connected to the collector of the fifth power switch S1 ', and the connection point is used as the A-phase output. In the case of different states of the switching devices, the phase A output may have five different levels.
所述三组钳位电路分别为：The three groups of clamping circuits are respectively:
第一组钳位电路，包括第一钳位支路和第二钳位支路。其中第一钳位支路为第一钳位二极管D1，其阴极与第一功率开关管S1的发射极连接，阳极与第一电容C1的负极和第二钳位二极管的阴极连接；第二钳位支路为串联(即上一二极管的阳极与下一二极管的阴极连接)的第二、三、四钳位二极管，因特性完全一致，因此以D1’×3表示(以下类似表示方法含义相同)，其中第四钳位二极管的阳极与第五功率开关管S1’的发射极连接；The first set of clamping circuits includes a first clamping branch and a second clamping branch. Wherein the first clamping branch is a first clamping diode D1 , its cathode is connected to the emitter of the first power switch S1 , and its anode is connected to the cathode of the first capacitor C1 and the cathode of the second clamping diode; The second clamping branch is the second, third, and fourth clamping diodes connected in series (that is, the anode of the previous diode is connected to the cathode of the next diode). Because the characteristics are exactly the same, it is represented by D 1 '×3 (the following is similar to The representation method has the same meaning), wherein the anode of the fourth clamping diode is connected to the emitter of the fifth power switch tube S1 ';
第二组钳位电路，包括第三钳位支路和第四钳位支路。其中第三钳位支路为串联的第五、六钳位二极管即D2×2，第五钳位二极管的阴极与第二功率开关管S2的发射极连接，第六钳位二极管的阳极与第二电容C2的负极和第七钳位二极管的阴极连接；第四钳位支路为串联的第七、八钳位二极管即D2’×2，第八钳位二极管的阳极与第六功率开关管S2’的发射极连接；The second set of clamping circuits includes a third clamping branch and a fourth clamping branch. Wherein the third clamping branch is the fifth and sixth clamping diodes connected in series, namely D2 ×2, the cathode of the fifth clamping diode is connected to the emitter of the second power switch S2 , and the anode of the sixth clamping diode It is connected with the cathode of the second capacitor C 2 and the cathode of the seventh clamping diode; the fourth clamping branch is the seventh and eighth clamping diodes connected in series, that is, D 2 '×2, and the anode of the eighth clamping diode is connected with the seventh clamping diode The emitters of the six power switch tubes S2 ' are connected;
第三组钳位电路，包括第五钳位支路和第六钳位支路。其中第五钳位支路为串联的第九、十、十一钳位二极管即D3×3，第九钳位二极管的阴极与第三功率开关管S3的发射极连接，第十一钳位二极管的阳极与第三电容C3的负极和第十二钳位二极管的阴极连接；第六钳位支路为第十二钳位二极管即D3’，其阳极与第七功率开关管S3’的发射极连接。The third group of clamping circuits includes a fifth clamping branch and a sixth clamping branch. Wherein the fifth clamping branch is the ninth, tenth and eleventh clamping diodes connected in series, namely D3 ×3, the cathode of the ninth clamping diode is connected to the emitter of the third power switch S3 , and the eleventh clamping diode The anode of the clamping diode is connected to the negative pole of the third capacitor C3 and the cathode of the twelfth clamping diode; the sixth clamping branch is the twelfth clamping diode D3 ', and its anode is connected to the seventh power switch tube S 3 ' to the emitter connection.
所述功率开关管为绝缘栅双极型晶体管IGBT或大功率晶体管GTR。The power switch tube is an insulated gate bipolar transistor IGBT or a high power transistor GTR.
一种采用二极管钳位式五电平光伏逆变器的供电系统，它包括多个太阳能电池板、多路直流升压主电路、MPPT控制器和二极管钳位式五电平光伏逆变器，是一种将太阳能光伏电池输出的直流电逆变成交流电，并输送给电网的装置。它采用多路直流输入，各路直流输入通过升压电路进行独立的最大功率点跟踪控制，充分发挥太阳能电池板的效率，再经过二极管钳位式五电平逆变器将直流电逆变成交流电，输送给电网，其中：A power supply system using a diode-clamped five-level photovoltaic inverter, which includes multiple solar panels, a multi-channel DC boost main circuit, an MPPT controller, and a diode-clamped five-level photovoltaic inverter, It is a device that inverts the direct current output by solar photovoltaic cells into alternating current and sends it to the grid. It adopts multiple DC inputs, and each DC input performs independent maximum power point tracking control through a boost circuit to give full play to the efficiency of the solar panel, and then converts DC into AC through a diode-clamped five-level inverter. , sent to the grid, where:
多路直流升压主电路的各路直流输入与对应的太阳能光伏电池板的各路直流输出端连接，直流升压电路输出端与二极管钳位式五电平光伏逆变器的直流输入端连接；Each DC input of the multi-channel DC boost main circuit is connected to each DC output terminal of the corresponding solar photovoltaic panel, and the output terminal of the DC boost circuit is connected to the DC input terminal of the diode-clamped five-level photovoltaic inverter ;
MPPT控制器，与多路升压主电路的功率开关器件门极连接，控制上述多路直流升压主电路进行独立的最大功率点跟踪控制，与上述多路直流升压主电路构成多路直流升压系统；The MPPT controller is connected to the gate of the power switching device of the multi-channel boost main circuit, controls the above-mentioned multi-channel DC boost main circuit to perform independent maximum power point tracking control, and forms a multi-channel DC with the above-mentioned multi-channel DC boost main circuit Boost system;
二极管钳位式五电平光伏逆变器的主电路，结构如前所述，其直流输入端与上述多路直流升压主电路的直流输出端连接，其交流输出端与电网连接；The main circuit of the diode-clamped five-level photovoltaic inverter has the structure as mentioned above, its DC input terminal is connected to the DC output terminal of the above-mentioned multi-channel DC step-up main circuit, and its AC output terminal is connected to the power grid;
逆变控制器，与二极管钳位式五电平逆变主电路的功率开关器件门极连接，对上述二极管钳位式五电平逆变主电路进行并网控制，与上述五电平逆变主电路构成五电平逆变系统；The inverter controller is connected to the gate of the power switching device of the diode-clamped five-level inverter main circuit, and performs grid-connected control on the above-mentioned diode-clamped five-level inverter main circuit, and is connected with the above-mentioned five-level inverter The main circuit constitutes a five-level inverter system;
多路直流升压系统，由多路直流升压主电路和MPPT控制器组成；The multi-channel DC boost system consists of a multi-channel DC boost main circuit and an MPPT controller;
五电平逆变系统，由上述五电平逆变主电路和逆变控制器构成；同时逆变主电路的逆变控制器与MPPT控制器通过通讯线路连接。The five-level inverter system is composed of the above-mentioned five-level inverter main circuit and an inverter controller; meanwhile, the inverter controller of the inverter main circuit is connected to the MPPT controller through a communication line.
本实用新型的特点如下：The features of the utility model are as follows:
1)将洁净的、可再生能源-太阳能光伏发电转换为交流电输送给电网；1) Convert clean, renewable energy-solar photovoltaic power generation into alternating current and send it to the grid;
2)多路直流输入，多路独立的最大功率点跟踪控制，光伏电池板利用效率高；2) Multi-channel DC input, multiple independent maximum power point tracking control, high utilization efficiency of photovoltaic panels;
3)五电平逆变设计下每个功率器件仅承受1/5的母线电压，因而可以使用低耐压器件实现高压大功率的输出；在每个功率器件电压等级不变的情况下，串联器件数的增加可以使输出电压等级提高5倍，从而得到五倍的输出功率；3) Under the five-level inverter design, each power device only bears 1/5 of the bus voltage, so low-voltage withstand devices can be used to achieve high-voltage and high-power output; when the voltage level of each power device remains unchanged, series connection The increase in the number of devices can increase the output voltage level by 5 times, thereby obtaining five times the output power;
4)五电平逆变设计下电平数的增加可以改善输出波形，减小输出电压波形畸变，使THD大大降低，对电能质量影响小，有利于大规模光伏发电的并网；可以用较低的开关频率获得和高开关频率下两电平变换器相同的输出电压波形，因此开关损耗小，系统的效率高；由于电平数的增加，在相同的直流母线电压和开关频率条件下，与两电平逆变器相比，开关器件所承受的开关应力dv/dt大大减小；4) The increase of the number of levels under the five-level inverter design can improve the output waveform, reduce the distortion of the output voltage waveform, greatly reduce the THD, and have little impact on the power quality, which is conducive to the grid connection of large-scale photovoltaic power generation; The low switching frequency obtains the same output voltage waveform as the two-level converter at high switching frequency, so the switching loss is small and the system efficiency is high; due to the increase in the number of levels, under the same DC bus voltage and switching frequency, Compared with the two-level inverter, the switching stress dv/dt borne by the switching device is greatly reduced;
5)二极管钳位式五电平逆变器在开关状态切换时，任一开关器件上都只承受直流母线一半的电压，从而不会产生动态电压共享问题；如果将二极管钳位式五电平逆变器中每条桥臂的顶部和底部两个开关管选择漏电流较小的器件，则静态时这两个开关管上的压降会被钳位二极管钳位在E，从而内部两个开关管上的电压也会固定在E，不需要在开关管上并联额外的电阻就能实现静态电压均衡；从而可以保证即使在多功率管参数不一致和开关瞬态的不同步情况下，各功率管在稳态和瞬态过程中承受的电压应力始终箝位于母线电容的电压，从而不会产生个别功率管过压，导致电路可靠性问题。5) When the diode-clamped five-level inverter switches between switching states, any switching device only bears half the voltage of the DC bus, so that there will be no dynamic voltage sharing problem; if the diode-clamped five-level inverter The top and bottom two switching tubes of each bridge arm in the inverter choose devices with small leakage current, then the voltage drop on the two switching tubes will be clamped at E by the clamping diode in static state, so that the internal two The voltage on the switch tube will also be fixed at E, and static voltage balance can be achieved without additional resistors connected in parallel on the switch tube; thus, it can be ensured that even in the case of inconsistent parameters of multiple power tubes and asynchronous switching transients, each power The voltage stress of the tubes in the steady state and transient process is always clamped to the voltage of the bus capacitor, so that there will be no overvoltage of individual power tubes, which will cause circuit reliability problems.
附图说明 Description of drawings
图1为本实用新型的整体结构图；Fig. 1 is the overall structural diagram of the utility model;
图2为二极管钳位式五电平逆变主电路结构示意图，包含直流母线与一条桥臂。Fig. 2 is a schematic structural diagram of a diode-clamped five-level inverter main circuit, including a DC bus and a bridge arm.
其中，1为直流升压主电路，2为MPPT控制器，3为逆变主电路，4为逆变控制器，5为太阳能电池，6为电网。Among them, 1 is the DC boost main circuit, 2 is the MPPT controller, 3 is the inverter main circuit, 4 is the inverter controller, 5 is the solar battery, and 6 is the grid.
具体实施方式 Detailed ways
下面结合附图与实施例对本实用新型做进一步说明。Below in conjunction with accompanying drawing and embodiment the utility model is described further.
图1为采用二极管钳位式五电平光伏逆变器的供电系统，它包括多个太阳能电池5，各太阳能电池5与各自的直流升压主电路1输入端连接，各直流升压主电路1则与MPPT控制器2连接，进行最大功率点跟踪控制；所述各直流升压主电路1的输出端则与逆变主电路3的直流输入端连接，逆变主电路3的交流输出端则与电网6连接；同时逆变主电路3的逆变控制器4与MPPT控制器2连接。Fig. 1 is a power supply system using a diode-clamped five-level photovoltaic inverter, which includes a plurality of
图2中，它包括逆变主电路3，逆变主电路3与逆变控制器4连接；所述逆变主电路3包括直流母线与三个结构完全相同的桥臂，各桥臂的直流输入端接输入的直流电流，各桥臂的交流输出端与电网6连接；其中，各桥臂的结构为：In Fig. 2, it comprises inverter
直流母线由四个电容C1、C2、C3和C4串联而成，即第一电容C1的正极与直流母线的正极连接，负极与第二电容C2的正极连接；第二电容C2的负极与第三电容C3的正极连接；第三电容C3的负极与第四电容C4的正极连接；第四电容C4的负极与直流母线的负极连接。提供五个不同的电平。The DC bus is composed of four capacitors C 1 , C 2 , C 3 and C 4 in series, that is, the positive pole of the first capacitor C 1 is connected to the positive pole of the DC bus, and the negative pole is connected to the positive pole of the second capacitor C 2 ; the second capacitor The negative pole of C2 is connected to the positive pole of the third capacitor C3 ; the negative pole of the third capacitor C3 is connected to the positive pole of the fourth capacitor C4 ; the negative pole of the fourth capacitor C4 is connected to the negative pole of the DC bus. Five different levels are available.
三条桥臂结构相同，每条桥臂包含8个功率开关管(可为绝缘栅双极型晶体管IGBT或大功率晶体管GTR)、8个功率二极管、12个钳位二极管，构成两组串联的开关电路和三组钳位电路。以第一桥臂为例：The three bridge arms have the same structure, and each bridge arm contains 8 power switch tubes (which can be insulated gate bipolar transistor IGBT or high-power transistor GTR), 8 power diodes, and 12 clamping diodes, forming two sets of switches in series circuit and three sets of clamping circuits. Take the first bridge arm as an example:
第一开关电路包含4个功率开关管和4个功率二极管，连接如下：The first switch circuit includes 4 power switch tubes and 4 power diodes, connected as follows:
功率开关管之间连接：Connection between power switch tubes:
第一功率开关管S1的集电极与直流母线的正极连接；The collector of the first power switch tube S1 is connected to the positive pole of the DC bus;
第一功率开关管S1的发射极与第二功率开关管S2的集电极连接；The emitter of the first power switch tube S1 is connected to the collector of the second power switch tube S2 ;
第二功率开关管S2的发射极与第三功率开关管S3的集电极连接；The emitter of the second power switch tube S2 is connected to the collector of the third power switch tube S3 ;
第三功率开关管S3的发射极与第四功率开关管S4的集电极连接；The emitter of the third power switch tube S3 is connected to the collector of the fourth power switch tube S4 ;
第四功率开关管S4的发射极与第五功率开关管S1’的集电极连接；The emitter of the fourth power switch S4 is connected to the collector of the fifth power switch S1 ';
功率开关管与功率二极管连接：The power switch tube is connected to the power diode:
第一功率开关管S1与第一功率二极管D11并联(S1的集电极与D11的阴极连接，S1的发射极与D11的阳极连接)；The first power switch tube S1 is connected in parallel with the first power diode D11 (the collector of S1 is connected to the cathode of D11 , and the emitter of S1 is connected to the anode of D11 );
第二功率开关管S2与第二功率二极管D12并联；The second power switch tube S2 is connected in parallel with the second power diode D12 ;
第三功率开关管S3与第三功率二极管D13并联；The third power switch tube S3 is connected in parallel with the third power diode D13 ;
第四功率开关管S4与第四功率二极管D14并联；The fourth power switch tube S4 is connected in parallel with the fourth power diode D14 ;
第一开关电路包含4个功率开关管和4个功率二极管，连接如下：The first switch circuit includes 4 power switch tubes and 4 power diodes, connected as follows:
第五功率开关管S1’的发射极与第六功率开关管S2’的集电极连接；The emitter of the fifth power switch S 1 ′ is connected to the collector of the sixth power switch S 2 ′ ;
第六功率开关管S2’的发射极与第七功率开关管S3’的集电极连接；The emitter of the sixth power switch S2 ' is connected to the collector of the seventh power switch S3 ';
第七功率开关管S3’的发射极与第八功率开关管S4’的集电极连接；The emitter of the seventh power switch S 3 ′ is connected to the collector of the eighth power switch S 4 ′;
第八功率开关管S4’的发射极与直流母线的负极连接。The emitter of the eighth power switch S 4 ′ is connected to the negative pole of the DC bus.
功率开关管与功率二极管连接：The power switch tube is connected to the power diode:
第五功率开关管S1’与第五功率二极管D21并联；The fifth power switch tube S 1 ′ is connected in parallel with the fifth power diode D 21 ;
第六功率开关管S2’与第六功率二极管D22并联；The sixth power switch tube S2 ' is connected in parallel with the sixth power diode D22 ;
第七功率开关管S3’与第七功率二极管D23并联；The seventh power switch tube S 3 ′ is connected in parallel with the seventh power diode D 23 ;
第八功率开关管S4’与第八功率二极管D24并联。The eighth power switch S 4 ′ is connected in parallel with the eighth power diode D 24 .
两组开关电路串联连接，即，第四功率开关管S4的发射极与第五功率开关管S1’的集电极连接，连接点作为A相输出。开关器件状态不同的情况下，A相输出可能为五个不同的电平。The two sets of switch circuits are connected in series, that is, the emitter of the fourth power switch S4 is connected to the collector of the fifth power switch S1 ', and the connection point is used as the A-phase output. In the case of different states of the switching devices, the phase A output may have five different levels.
所述三组钳位电路分别为：The three groups of clamping circuits are respectively:
第一组钳位电路，包括第一钳位支路和第二钳位支路。其中第一钳位支路为第一钳位二极管D1，其阴极与第一功率开关管S1的发射极连接，阳极与第一电容C1的负极和第二钳位二极管的阴极连接；第二钳位支路为串联(即上一二极管的阳极与下一二极管的阴极连接)的第二、三、四钳位二极管，因特性完全一致，因此以D1’×3表示(以下类似表示方法含义相同)，其中第四钳位二极管的阳极与第五功率开关管S1’的发射极连接；The first set of clamping circuits includes a first clamping branch and a second clamping branch. Wherein the first clamping branch is a first clamping diode D1 , its cathode is connected to the emitter of the first power switch S1 , and its anode is connected to the cathode of the first capacitor C1 and the cathode of the second clamping diode; The second clamping branch is the second, third, and fourth clamping diodes connected in series (that is, the anode of the previous diode is connected to the cathode of the next diode). Because the characteristics are exactly the same, it is represented by D 1 '×3 (the following is similar to The representation method has the same meaning), wherein the anode of the fourth clamping diode is connected to the emitter of the fifth power switch tube S1 ';
第二组钳位电路，包括第三钳位支路和第四钳位支路。其中第三钳位支路为串联的第五、六钳位二极管即D2×2，第五钳位二极管的阴极与第二功率开关管S2的发射极连接，第六钳位二极管的阳极与第二电容C2的负极和第七钳位二极管的阴极连接；第四钳位支路为串联的第七、八钳位二极管即D2’×2，第八钳位二极管的阳极与第六功率开关管S2’的发射极连接；The second set of clamping circuits includes a third clamping branch and a fourth clamping branch. Wherein the third clamping branch is the fifth and sixth clamping diodes connected in series, namely D2 ×2, the cathode of the fifth clamping diode is connected to the emitter of the second power switch S2 , and the anode of the sixth clamping diode It is connected with the cathode of the second capacitor C 2 and the cathode of the seventh clamping diode; the fourth clamping branch is the seventh and eighth clamping diodes connected in series, that is, D 2 '×2, and the anode of the eighth clamping diode is connected with the seventh clamping diode The emitters of the six power switch tubes S2 ' are connected;
第三组钳位电路，包括第五钳位支路和第六钳位支路。其中第五钳位支路为串联的第九、十、十一钳位二极管即D3×3，第九钳位二极管的阴极与第三功率开关管S3的发射极连接，第十一钳位二极管的阳极与第三电容C3的负极和第十二钳位二极管的阴极连接；第六钳位支路为第十二钳位二极管即D3’，其阳极与第七功率开关管S3’的发射极连接。The third group of clamping circuits includes a fifth clamping branch and a sixth clamping branch. Wherein the fifth clamping branch is the ninth, tenth and eleventh clamping diodes connected in series, namely D3 ×3, the cathode of the ninth clamping diode is connected to the emitter of the third power switch S3 , and the eleventh clamping diode The anode of the clamping diode is connected to the negative pole of the third capacitor C3 and the cathode of the twelfth clamping diode; the sixth clamping branch is the twelfth clamping diode D3 ', and its anode is connected to the seventh power switch tube S 3 ' to the emitter connection.
Claims (5)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510231A (en) * | 2011-11-05 | 2012-06-20 | 山东电力研究院 | Diode clamp type five-level photovoltaic inverter and power supply system using the same |
| CN102780393A (en) * | 2012-08-14 | 2012-11-14 | 北方工业大学 | Series circuit of PV (photovoltaic) modules and adaptive energy equalization method thereof |
| CN111327073A (en) * | 2020-03-07 | 2020-06-23 | 深圳市禾望科技有限公司 | Photovoltaic inverter main circuit |
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2011
- 2011-11-05 CN CN2011204351704U patent/CN202276295U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510231A (en) * | 2011-11-05 | 2012-06-20 | 山东电力研究院 | Diode clamp type five-level photovoltaic inverter and power supply system using the same |
| CN102780393A (en) * | 2012-08-14 | 2012-11-14 | 北方工业大学 | Series circuit of PV (photovoltaic) modules and adaptive energy equalization method thereof |
| CN111327073A (en) * | 2020-03-07 | 2020-06-23 | 深圳市禾望科技有限公司 | Photovoltaic inverter main circuit |
| CN111327073B (en) * | 2020-03-07 | 2023-09-29 | 深圳市禾望科技有限公司 | Main circuit of photovoltaic inverter |
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