A photovoltaic energy storage system
Patent Information
- Application Number
- CN202521812589.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-25
- Publication Date
- 2026-08-28
- Estimated Expiration
- 2035-08-25
AI Technical Summary
[0003]然而，集中式光伏发电对光照条件极为敏感，一旦出现光照不稳定的情况，如天气突变导致云层遮挡阳光，或是光伏板局部出现阴影遮挡、功率集中区域产生热斑现象，就会出现电网电压波动的问题
通过将光伏发电模块、电能转换模块和换流转换模块依次连接，结合电能转换模块的多路输出以及换流转换模块的储能接入单元和H桥换流单元设计，能够解决传统集中式光伏发电存在的波动性问题，如光照不稳定、阴影遮挡和热斑现象导致的电网电压波动，并有效处理集中式光伏在消纳和存储间歇性能源时产生的电量存储、电池损耗、容量配置等问题，实现了多余电能的存储和调度，平滑发电输出，降低传输损耗，提升了电能质量和系统稳定性，保护电网与用电设备安全稳定。
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Figure CN224697430U_ABST
Abstract
Claims
1. A photovoltaic energy storage system, characterized in that, include: The system includes a photovoltaic power generation module, a power conversion module, and a converter module, wherein the output terminal of the photovoltaic power generation module is connected to the input terminal of the power conversion module, and the output terminal of the power conversion module is connected to the input terminal of the converter module. The power conversion module has multiple outputs. The converter module includes multiple energy storage access units and a power circuit connected to the output terminal of each energy storage access unit. Each output of the power conversion module is connected to the input terminal of the energy storage access unit.
2. The photovoltaic energy storage system according to claim 1, characterized in that, The photovoltaic power generation module includes a photovoltaic unit, a first energy storage battery unit, a photovoltaic converter unit, and an energy storage converter unit. The photovoltaic unit and the photovoltaic converter unit are connected in series, the first energy storage battery unit and the energy storage converter unit are connected in series, and the photovoltaic unit and the first energy storage battery unit are connected in parallel.
3. The photovoltaic energy storage system according to claim 2, characterized in that, The photovoltaic converter unit includes a first resistor unit, a second resistor unit, a first inductor unit, a first switching transistor unit, and a second switching transistor unit; the energy storage converter unit includes a third resistor unit, a fourth resistor unit, a second inductor unit, a third switching transistor unit, and a fourth switching transistor unit. One end of the photovoltaic unit is connected to one end of the first resistor unit and one end of the first inductor unit, respectively. The other end of the first resistor unit is connected to one end of the second resistor unit, and the other end of the second resistor unit is connected to the other end of the photovoltaic unit. The connection point between the first resistor unit and the second resistor unit is grounded. The other end of the first inductor unit is connected to one end of the first switching transistor unit and one end of the second switching transistor unit, respectively. The other end of the first switching transistor unit is connected to the other end of the photovoltaic unit and the second input terminal of the power conversion module, respectively. The other end of the second switching transistor unit is connected to the other end of the fourth switching transistor unit and the first input terminal of the power conversion module, respectively. One end of the first energy storage battery unit is connected to one end of the third resistor unit and one end of the second inductor unit, respectively. The other end of the third resistor unit is connected to one end of the fourth resistor unit, and the other end of the fourth resistor unit is connected to the other end of the first energy storage battery unit. The connection point between the third resistor unit and the fourth resistor unit is grounded. The other end of the second inductor unit is connected to one end of the third switch unit and one end of the fourth switch unit, respectively. The other end of the third switch unit is connected to the other end of the first energy storage battery unit and the second input terminal of the power conversion module, respectively.
4. The photovoltaic energy storage system according to claim 1, characterized in that, The power conversion module includes an inverter circuit, a transformer unit, and a rectifier circuit. The primary winding of the transformer unit is connected to the output terminal of the photovoltaic power generation module through the inverter circuit, and the secondary winding of the transformer unit is connected to the input terminal of the converter module through the rectifier circuit.
5. The photovoltaic energy storage system according to claim 4, characterized in that, The transformer unit is a center-tapped transformer, which includes a primary winding, a secondary winding, and a tertiary winding. A center tap is led out from the middle position of the primary winding, the secondary winding, and the tertiary winding. The center taps of the primary winding, the secondary winding, and the tertiary winding are respectively connected to an energy storage access unit in the power conversion module.
6. The photovoltaic energy storage system according to claim 4 or 5, characterized in that, The inverter circuit includes a fifth switching transistor unit, a sixth switching transistor unit, a seventh switching transistor unit, and an eighth switching transistor unit. The drains of the fifth and sixth switching transistor units are connected to one output terminal of the photovoltaic power generation module. The sources of the seventh and eighth switching transistor units are connected to the other output terminal of the photovoltaic power generation module. The source of the fifth switching transistor unit is connected to the drain of the seventh switching transistor unit. The connection point between the source and drain of the fifth and seventh switching transistor units is connected to one end of the primary winding of the transformer unit. The source of the sixth switching transistor unit is connected to the drain of the eighth switching transistor unit. The connection point between the source and drain of the sixth and eighth switching transistor units is connected to the other end of the primary winding of the transformer unit.
7. The photovoltaic energy storage system according to claim 5, characterized in that, The rectifier circuit includes a first sub-rectifier circuit, a second sub-rectifier circuit, and a third sub-rectifier circuit. The first sub-rectifier circuit includes a ninth switching transistor unit, a tenth switching transistor unit, a first diode unit, and a second diode unit. The drain of the ninth switching transistor unit is connected to the anode of the first diode unit, and the source of the ninth switching transistor unit is connected to the first output terminal of the first primary winding. The source of the tenth switching transistor unit is connected to the anode of the second diode unit, and the drain of the tenth switching transistor unit is connected to the second output terminal of the first primary winding. The cathodes of the first diode unit and the second diode unit are jointly connected to one of the energy storage access units of the power conversion module. The second sub-rectifier circuit includes an eleventh switching transistor unit, a twelfth switching transistor unit, a third diode unit, and a fourth diode unit. The drain of the eleventh switching transistor unit is connected to the anode of the third diode unit, and the source of the eleventh switching transistor unit is connected to the first output terminal of the second stage winding. The source of the twelfth switching transistor unit is connected to the anode of the fourth diode unit, and the drain of the twelfth switching transistor unit is connected to the second output terminal of the second stage winding. The cathodes of the third and fourth diode units are connected to one of the energy storage access units of the power conversion module. The third sub-rectifier circuit includes a thirteenth switching transistor unit, a fourteenth switching transistor unit, a fifth diode unit, and a sixth diode unit. The drain of the thirteenth switching transistor unit is connected to the anode of the fifth diode unit, and the source of the thirteenth switching transistor unit is connected to the first output terminal of the third stage winding. The source of the fourteenth switching transistor unit is connected to the anode of the sixth diode unit, and the drain of the fourteenth switching transistor unit is connected to the second output terminal of the third stage winding. The cathodes of the fifth and sixth diode units are jointly connected to one of the energy storage access units of the power conversion module.
8. The photovoltaic energy storage system according to claim 7, characterized in that, The converter module includes a first energy storage access unit, a second energy storage access unit, and a third energy storage access unit, as well as a first power circuit connected to the output terminal of the first energy storage access unit, a second power circuit connected to the output terminal of the second energy storage access unit, and a third power circuit connected to the output terminal of the third energy storage access unit. The cathodes of the first diode unit and the second diode unit are jointly connected to the first energy storage access unit; the cathodes of the third diode unit and the fourth diode unit are jointly connected to the second energy storage access unit; and the cathodes of the fifth diode unit and the sixth diode unit are jointly connected to the third energy storage access unit.
9. The photovoltaic energy storage system according to claim 8, characterized in that, The first energy storage access unit includes a fifteenth switching transistor unit, a sixteenth switching transistor unit, a second energy storage battery unit, a first capacitor unit, and a third inductor unit. The drain of the fifteenth switching transistor unit is connected to the positive terminal of the second energy storage battery unit, and the source of the fifteenth switching transistor unit is connected to the drain of the sixteenth switching transistor unit. The source of the sixteenth switching transistor unit is connected to one end of the first capacitor unit and one end of the third inductor unit, respectively. The other end of the first capacitor unit is connected to the negative terminal of the second energy storage battery unit, and the negative terminal of the second energy storage battery unit and the other end of the third inductor unit are connected to the first power circuit. The second energy storage access unit includes a seventeenth switching transistor unit, an eighteenth switching transistor unit, a third energy storage battery unit, a second capacitor unit, and a fourth inductor unit. The drain of the seventeenth switching transistor unit is connected to the positive terminal of the third energy storage battery unit, and the source of the seventeenth switching transistor unit is connected to the drain of the eighteenth switching transistor unit. The source of the eighteenth switching transistor unit is connected to one end of the second capacitor unit and one end of the fourth inductor unit, respectively. The other end of the second capacitor unit is connected to the negative terminal of the third energy storage battery unit. The negative terminal of the third energy storage battery unit and the other end of the fourth inductor unit are connected to the second power circuit. The third energy storage access unit includes a nineteenth switching transistor unit, a twentieth switching transistor unit, a fourth energy storage battery unit, a third capacitor unit, and a fifth inductor unit. The drain of the nineteenth switching transistor unit is connected to the positive terminal of the fourth energy storage battery unit, and the source of the nineteenth switching transistor unit is connected to the drain of the twentieth switching transistor unit. The source of the twentieth switching transistor unit is connected to one end of the third capacitor unit and one end of the fifth inductor unit, respectively. The other end of the third capacitor unit is connected to the negative terminal of the fourth energy storage battery unit, and the negative terminal of the fourth energy storage battery unit and the other end of the fifth inductor unit are connected to the third power circuit.
10. The photovoltaic energy storage system according to claim 8, characterized in that, The first power circuit includes a 21st switching transistor unit, a 22nd switching transistor unit, a 23rd switching transistor unit, and a 24th switching transistor unit. The drains of the 21st and 22nd switching transistor units are connected to the other end of the third inductor unit. The sources of the 23rd and 24th switching transistor units are connected to the negative terminal of the second energy storage battery unit. The source of the 21st switching transistor unit is connected to the drain of the 23rd switching transistor unit. The connection point between the source of the 21st switching transistor unit and the drain of the 23rd switching transistor unit is used to connect to an input terminal of an output device. The source of the 22nd switching transistor unit is connected to the drain of the 24th switching transistor unit. The second power circuit includes a 25th switching transistor unit, a 26th switching transistor unit, a 27th switching transistor unit, and a 28th switching transistor unit. The drains of the 25th and 26th switching transistor units are connected to the other end of the fourth inductor unit. The sources of the 27th and 28th switching transistor units are connected to the negative terminal of the third energy storage battery unit. The source of the 25th switching transistor unit is connected to the drain of the 27th switching transistor unit. The connection point between the source of the 25th switching transistor unit and the drain of the 27th switching transistor unit is connected to the connection point between the source of the 22nd switching transistor unit and the drain of the 24th switching transistor unit. The third power circuit includes a 29th switching transistor unit, a 30th switching transistor unit, a 31st switching transistor unit, and a 32nd switching transistor unit. The drains of the 29th and 30th switching transistor units are connected to the other end of the fifth inductor unit. The sources of the 31st and 32nd switching transistor units are connected to the negative terminal of the fourth energy storage battery unit. The source of the 29th switching transistor unit is connected to the drain of the 31st switching transistor unit. The connection point between the source of the 29th switching transistor unit and the drain of the 31st switching transistor unit is connected to the connection point between the source of the 26th switching transistor unit and the drain of the 28th switching transistor unit. The connection point between the source of the 30th switching transistor unit and the drain of the 32nd switching transistor unit is used to connect to another input terminal of the output device.