CN112290792A - 一种基于柔性切换的光伏并网逆变器 - Google Patents
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Abstract
一种基于柔性切换的光伏并网逆变器,包括太阳能板模块、高升压转换器电路、柔性切换电路、整流桥电路、滤波电路和电网模块。本发明和传统的光伏并网逆变器相比,该拓扑结构采用准共振式直流链柔性切换,使整流桥电路的功率开关管器件在零电压下导通,降低开关元件的开关损耗和电磁干扰,提高光伏并网逆变器的转换效率,具有很高的电压增益和电压调整率,保证小体积、稳定性和经济性,应用前景非常广泛。
Description
技术领域
本发明涉及光伏发电技术领域,具体涉及一种基于柔性切换的光伏并网逆变器。
背景技术
随着化石能源的日益枯竭,温室效应等一系列环境污染问题也随之而来,因此面对严峻的能源危机,人们不断对新能源进行探索和研究,其中太阳能因其环境友善、转换便捷和取之不尽等特点,在各国能源研究中占据重要一环。所以,需要提高光伏转换效率并减少电磁干扰,因此光伏并网逆变器的研究设计非常具有应用意义与市场价值。
传统的硬式切换光伏并网逆变器,往往为了减小逆变器的体积和质量,而去提高开关频率,但较高的开关频率会增加功率开关器件的切换损耗,造成开关器件的散热问题,并使电磁干扰增大,从而影响电力系统的供电质量和正常工作。因此我们需要解决光伏并网逆变器效率低下的问题,并保证小体积、稳定性和经济性。
发明内容
有鉴于此,本发明的目的是提供一种基于柔性切换的光伏并网逆变器,与传统的光伏并网逆变器相比,整流桥电路的功率开关管器件在零电压下导通,降低开关元件的开关损耗和电磁干扰,提高光伏并网逆变器的转换效率,并采用高升压转换器,具有很高的电压增益和电压调整率,保证小体积、稳定性和经济性,应用前景非常广泛。
本发明采取的技术方案为:一种基于柔性切换的光伏并网逆变器,包括太阳能板模块、高升压转换器电路、柔性切换电路、整流桥电路、滤波电路和电网模块;太阳能板模块输出与高升压转换器电路相连,高升压转换器电路输出与柔性切换电路相连,柔性切换电路输出与整流桥电路相连,整流桥电路输出与滤波电路相连,滤波电路输出与电网模块相连;所述太阳能板模块包括直流输入电源Vin;所述高升压转换器电路包括电感L1、电感L2、耦合电感Lm、耦合电感Ln、二极管VD1、二极管VD2、二极管VD3、功率MOSFET管S、电容Co、电容C1、电容C2、电容C3和电容C4;所述柔性切换电路包括耦合电感Ls1、耦合电感Ls2、二极管VDs、功率MOSFET管QS、电容Cdc和电容Cs;所述整流桥电路包括功率MOSFET管S1、功率MOSFET管S2、功率MOSFET管S3、功率MOSFET管S4、功率MOSFET管S5和功率MOSFET管S6;所述滤波电路包括滤波电感LE和滤波电容CE。
所述太阳能板模块输出为直流电17V。
所述高升压转换器电路的电感L1的一端连接太阳能板模块,电感L1的另一端连接耦合电感Lm和电感L2,耦合电感Lm和电感L2的另一端连接a点;功率MOSFET管S的一端连接a点,电容C1的一端连接b点,电容Co的一端连接c点,功率MOSFET管S、电容C1、电容Co的另一端连接e点;二极管VD1的阳极连接a点,二极管VD1的阴极连接b点;电容C2和耦合电感Ln的一端连接b点,电容C2和耦合电感Ln的另一端连接二极管VD3的阳极和电容C3,二极管VD3的阴极和电容C3的另一端连接二极管VD2的阳极,二极管VD2的阴极连接c点。
所述柔性切换电路的电容Cdc的一端连接c点,电容Cs的一端连接d点,电容Cdc和电容Cs的另一端连接e点;耦合电感Ls1和耦合电感Ls2的一端连接c点,耦合电感Ls1的另一端连接功率MOSFET管QS,功率MOSFET管QS的另一端连接d点;耦合电感Ls2的另一端连接二极管VDs的阴极,二极管VDs的阳极连接d点。
所述整流桥电路的功率MOSFET管S1的一端连接功率MOSFET管S4,功率MOSFET管S2的一端连接功率MOSFET管S5,功率MOSFET管S3的一端连接功率MOSFET管S6,功率MOSFET管S1、功率MOSFET管S2和功率MOSFET管S3的另一端连接d点;功率MOSFET管S4、功率MOSFET管S5和功率MOSFET管S6的另一端连接e点。
所述滤波电路的滤波电感LE的一端分别连接整流桥电路桥臂中点,滤波电感LE的另一端连接电网模块;滤波电容CE的一端分别连接滤波电感LE,滤波电容CE的另一端连接在f点。
本发明一种基于柔性切换的光伏并网逆变器,具有如下优点:本发明采用准共振式直流链柔性切换,使整流桥电路的功率开关管器件在零电压下导通,降低开关元件的开关损耗和电磁干扰,柔性切换电路中辅助电路可保证共振电容Cs放电至零,提高光伏并网逆变器的转换效率,并采用结合耦合电感和电压提升技术的高升压转换器,具有很高的电压增益和电压调整率,保证小体积、稳定性和经济性。
附图说明
图1是本发明一种基于柔性切换的光伏并网逆变器的电路结构图。
图2是本发明一种基于柔性切换的光伏并网逆变器导通模式1的等效电路图(t1≤t≤t2)。
图3是本发明一种基于柔性切换的光伏并网逆变器导通模式2的等效电路图(t2≤t≤t3)。
图4是本发明一种基于柔性切换的光伏并网逆变器导通模式3的等效电路图(t3≤t≤t4)。
图5是本发明一种基于柔性切换的光伏并网逆变器导通模式4的等效电路图(t4≤t≤t5)。
图6是本发明一种基于柔性切换的光伏并网逆变器导通模式5的等效电路图(t5≤t≤t6)。
图7是本发明一种基于柔性切换的光伏并网逆变器导通模式6的等效电路图(t6≤t≤t7)。
具体实施方式
图1所示为一种基于柔性切换的光伏并网逆变器,包括太阳能板模块、高升压转换器电路、柔性切换电路、整流桥电路、滤波电路和电网模块;太阳能板模块输出与高升压转换器电路相连,高升压转换器电路输出与柔性切换电路相连,柔性切换电路输出与整流桥电路相连,整流桥电路输出与滤波电路相连,滤波电路输出与电网模块相连;所述太阳能板模块包括直流输入电源Vin;所述高升压转换器电路包括电感L1、电感L2、耦合电感Lm、耦合电感Ln、二极管VD1、二极管VD2、二极管VD3、功率MOSFET管S、电容Co、电容C1、电容C2、电容C3和电容C4;所述柔性切换电路包括耦合电感Ls1、耦合电感Ls2、二极管VDs、功率MOSFET管QS、电容Cdc和电容Cs;所述整流桥电路包括功率MOSFET管S1、功率MOSFET管S2、功率MOSFET管S3、功率MOSFET管S4、功率MOSFET管S5和功率MOSFET管S6;所述滤波电路包括滤波电感LE和滤波电容CE。
所述太阳能板模块输出为直流电17V。
所述高升压转换器电路的电感L1的一端连接太阳能板模块,电感L1的另一端连接耦合电感Lm和电感L2,耦合电感Lm和电感L2的另一端连接a点;功率MOSFET管S的一端连接a点,电容C1的一端连接b点,电容Co的一端连接c点,功率MOSFET管S、电容C1、电容Co的另一端连接e点;二极管VD1的阳极连接a点,二极管VD1的阴极连接b点;电容C2和耦合电感Ln的一端连接b点,电容C2和耦合电感Ln的另一端连接二极管VD3的阳极和电容C3,二极管VD3的阴极和电容C3的另一端连接二极管VD2的阳极,二极管VD2的阴极连接c点。
所述柔性切换电路的电容Cdc的一端连接c点,电容Cs的一端连接d点,电容Cdc和电容Cs的另一端连接e点;耦合电感Ls1和耦合电感Ls2的一端连接c点,耦合电感Ls1的另一端连接功率MOSFET管QS,功率MOSFET管QS的另一端连接d点;耦合电感Ls2的另一端连接二极管VDs的阴极,二极管VDs的阳极连接d点。
所述整流桥电路的功率MOSFET管S1的一端连接功率MOSFET管S4,功率MOSFET管S2的一端连接功率MOSFET管S5,功率MOSFET管S3的一端连接功率MOSFET管S6,功率MOSFET管S1、功率MOSFET管S2和功率MOSFET管S3的另一端连接d点;功率MOSFET管S4、功率MOSFET管S5和功率MOSFET管S6的另一端连接e点。
所述滤波电路的滤波电感LE的一端分别连接整流桥电路桥臂中点,滤波电感LE的另一端连接电网模块;滤波电容CE的一端分别连接滤波电感LE,滤波电容CE的另一端连接在f点。
为更清楚的说明本发明所提的一种基于柔性切换的光伏并网逆变器,下面结合附图和具体实施方式对本发明做进一步详细的说明。本发明拓扑结构采用准共振式直流链柔性切换,可以利用SVPWM进行控制,经高升压转换器的直流电流通过直流链开关功率MOSFET管QS,共振电容Cs和整流桥并联,当整流桥的功率MOSFET管开关状态改变时,直流链开关QS将会截止断开,此时共振电容Cs经由辅助电路放电,因此,可以在整流桥开关切换状态前,使之在零电压下导通,达到ZVS效果。并且共振电容Cs和辅助电路可以克服传统柔性切换电路无法确保共振电容放电至零的缺点,提高光伏并网逆变器的转换效率。
图2所示是导通模式1的等效电路图(t1≤t≤t2),由于开关频率远大于电网频率,故将电网模块用一电流源Io代替,整流桥等效为一个开关元件进行简化分析。在t1时,直流链开关QS导通,由于存在耦合电感Ls1,故QS是在零电流ZCS的情况下导通的,流经耦合电感Ls1的电流iLs1线性增加,至IS1时进入导通模式2。
图3所示是导通模式2的等效电路图(t2≤t≤t3),在t2时,整流桥等效开关S1截止断开,此时共振电容Cs两端电压为零,故开关S1在零电压下关断,耦合电感Ls1和共振电容Cs发生谐振,共振电容Cs进行充电至其两端电压和Vin相等。
图4所示是导通模式3的等效电路图(t3≤t≤t4),在t3时,共振电容Cs两端电压和Vin相等,二极管VDs导通,此时耦合电感Ls1的漏磁通转移到耦合电感Ls2,直流端能量传输到电网负载端。
图5所示是导通模式4的等效电路图(t4≤t≤t5),此时直流链开关QS断开,共振电容Cs经耦合电感Ls2进行放电至零。
图6所示是导通模式5的等效电路图(t5≤t≤t6),此时整流桥等效开关S1导通。
图7所示是导通模式6的等效电路图(t6≤t≤t7),电路中只有整流桥等效开关S1和电网等效电流源Io,此时光伏并网逆变器已完成零电压ZVS下导通。再经滤波电路进入电网模块,令整流桥电路的功率开关管器件在零电压下导通,降低开关元件的开关损耗和电磁干扰,提高光伏并网逆变器的转换效率。
以上对本发明的实施例进行了描述,上述的具体实施方式仅仅是示意性的,而不是所述技术方案的限制,所以本发明并不局限于上述的具体实施方式,所有本领域普通技术人员在不脱离本发明宗旨和构思的前提下,及其它对本发明技术方案的简单替换和各种变化,都属于本发明的保护范围。
Claims (6)
1.一种基于柔性切换的光伏并网逆变器,其特征是:它包括太阳能板模块、高升压转换器电路、柔性切换电路、整流桥电路、滤波电路和电网模块;太阳能板模块输出与高升压转换器电路相连,高升压转换器电路输出与柔性切换电路相连,柔性切换电路输出与整流桥电路相连,整流桥电路输出与滤波电路相连,滤波电路输出与电网模块相连;所述太阳能板模块包括直流输入电源Vin;所述高升压转换器电路包括电感L1、电感L2、耦合电感Lm、耦合电感Ln、二极管VD1、二极管VD2、二极管VD3、功率MOSFET管S、电容Co、电容C1、电容C2、电容C3和电容C4;所述柔性切换电路包括耦合电感Ls1、耦合电感Ls2、二极管VDs、功率MOSFET管QS、电容Cdc和电容Cs;所述整流桥电路包括功率MOSFET管S1、功率MOSFET管S2、功率MOSFET管S3、功率MOSFET管S4、功率MOSFET管S5和功率MOSFET管S6;所述滤波电路包括滤波电感LE和滤波电容CE。
2.如权利要求1所述的一种基于柔性切换的光伏并网逆变器,其特征是:所述太阳能板模块输出为直流电17V。
3.如权利要求1所述的一种基于柔性切换的光伏并网逆变器,其特征是:所述高升压转换器电路的电感L1的一端连接太阳能板模块,电感L1的另一端连接耦合电感Lm和电感L2,耦合电感Lm和电感L2的另一端连接a点;功率MOSFET管S的一端连接a点,电容C1的一端连接b点,电容Co的一端连接c点,功率MOSFET管S、电容C1、电容Co的另一端连接e点;二极管VD1的阳极连接a点,二极管VD1的阴极连接b点;电容C2和耦合电感Ln的一端连接b点,电容C2和耦合电感Ln的另一端连接二极管VD3的阳极和电容C3,二极管VD3的阴极和电容C3的另一端连接二极管VD2的阳极,二极管VD2的阴极连接c点。
4.如权利要求1所述的一种基于柔性切换的光伏并网逆变器,其特征是:所述柔性切换电路的电容Cdc的一端连接c点,电容Cs的一端连接d点,电容Cdc和电容Cs的另一端连接e点;耦合电感Ls1和耦合电感Ls2的一端连接c点,耦合电感Ls1的另一端连接功率MOSFET管QS,功率MOSFET管QS的另一端连接d点;耦合电感Ls2的另一端连接二极管VDs的阴极,二极管VDs的阳极连接d点。
5.如权利要求1所述的一种基于柔性切换的光伏并网逆变器,其特征是:所述整流桥电路的功率MOSFET管S1的一端连接功率MOSFET管S4,功率MOSFET管S2的一端连接功率MOSFET管S5,功率MOSFET管S3的一端连接功率MOSFET管S6,功率MOSFET管S1、功率MOSFET管S2和功率MOSFET管S3的另一端连接d点;功率MOSFET管S4、功率MOSFET管S5和功率MOSFET管S6的另一端连接e点。
6.如权利要求1所述的一种基于柔性切换的光伏并网逆变器,其特征是:所述滤波电路的滤波电感LE的一端分别连接整流桥电路桥臂中点,滤波电感LE的另一端连接电网模块;滤波电容CE的一端分别连接滤波电感LE,滤波电容CE的另一端连接在f点。
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