CN103984840B - Modeling method of concentrating solar photovoltaic power generation system - Google Patents
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Abstract
Description
技术领域technical field
本发明属于太阳能光伏发电技术领域，具体涉及到一种基于多结层叠太阳能电池的聚光太阳能光伏发电系统的建模方法。The invention belongs to the technical field of solar photovoltaic power generation, and in particular relates to a modeling method of a concentrated solar photovoltaic power generation system based on multi-junction stacked solar cells.
背景技术Background technique
具有低能耗、低成本、低污染特点的高效聚光型光伏发电技术正在成为光伏技术发展的一个主要方向，与传统的晶硅光伏发电技术相比，聚光型光伏技术光电转化效率可提高一倍。高效聚光型光伏发电技术能够实现低能耗、低成本的原因主要有两方面：首先，聚光光伏系统所需要的光伏材料大大减少，用来聚光的材料如玻璃、有机高分子材料或者铁皮、铝片都比晶硅材料容易生产，成本低2个数量级；其次，在高倍聚光条件下，可以采用高科技多结光伏材料，多PN结光伏材料可以更充分的吸收太阳光能量。高倍聚光、多结光伏材料是真正体现高科技强大威力的技术，一旦进入大规模应用，高倍聚光发电成本可以低于核电和火电发电成本。High-efficiency concentrating photovoltaic power generation technology with low energy consumption, low cost and low pollution is becoming a main direction of photovoltaic technology development. Compared with traditional crystalline silicon photovoltaic power generation technology, the photoelectric conversion efficiency of concentrating photovoltaic technology can be improved by one times. There are two main reasons why high-efficiency concentrating photovoltaic power generation technology can achieve low energy consumption and low cost: first, the photovoltaic materials required for concentrating photovoltaic systems are greatly reduced, and the materials used for concentrating light, such as glass, organic polymer materials or iron sheet Aluminum sheets are easier to produce than crystalline silicon materials, and the cost is 2 orders of magnitude lower; secondly, under the condition of high concentration, high-tech multi-junction photovoltaic materials can be used, and multi-PN junction photovoltaic materials can more fully absorb sunlight energy. High-power concentrating and multi-junction photovoltaic materials are technologies that truly embody the power of high technology. Once they are applied on a large scale, the cost of high-power concentrating power generation can be lower than that of nuclear power and thermal power generation.
聚光太阳能光伏发电技术通常采用多结层叠Ⅲ-Ⅴ族化合物太阳能电池作为其发电核心器件，该电池具有极高的光电转换效率，最新报道的四结电池效率已经达到44.7％。一般太阳能电池都是由单一材料作为活性层制备而成，只能吸收特定波段范围的太阳光，故电池转换效率较为有限。而多结太阳能电池由不同带隙半导体材料的子电池按带隙宽度由大到小从上而下层叠而成，如图1所示，各子电池针对不同波段的太阳光进行选择性吸收，最终实现对太阳光的广谱吸收，从而大幅提高电池的光电转换效率。为了进一步提升电池效率并降低多结太阳能电池的发电成本，一般采用光学处理系统将垂直入射太阳光聚焦到多结电池上进行光伏转换，聚光倍数可达2000～3000倍。Concentrating solar photovoltaic power generation technology usually uses multi-junction stacked III-V compound solar cells as its core device for power generation. This cell has extremely high photoelectric conversion efficiency, and the efficiency of the latest reported four-junction cell has reached 44.7%. Generally, solar cells are made of a single material as the active layer, which can only absorb sunlight in a specific wavelength range, so the conversion efficiency of the cell is relatively limited. The multi-junction solar cell is composed of sub-cells of different bandgap semiconductor materials stacked from top to bottom according to the bandgap width from large to small. As shown in Figure 1, each sub-cell selectively absorbs sunlight in different bands. Finally, broad-spectrum absorption of sunlight can be achieved, thereby greatly improving the photoelectric conversion efficiency of the cell. In order to further improve cell efficiency and reduce the cost of power generation of multi-junction solar cells, an optical processing system is generally used to focus vertically incident sunlight onto multi-junction cells for photovoltaic conversion, and the concentration multiple can reach 2000-3000 times.
多结层叠太阳能电池一般通过MOCVD半导体外延工艺制作而成，目前主要有两种方法：一种是基于晶格匹配(Lattice-mateched，LM)技术，要求层叠的每结材料与衬底材料实现晶格匹配，这对材料的选择具有很大的限制性；另一种基于变形(Metamorphic，MM)技术，引入渐变缓冲层解决某些PN结材料与衬底材料之间的晶格失配问题。无论采用哪种方法，各PN结之间都是通过隧道二极管串接，因此其输出电流受到最小输出电流的PN结所限制，其它PN结输出的高于限制电流的部分将会用于发热，使得电池温度迅速上升，最终导致电池光电转换效率降低。Multi-junction stacked solar cells are generally made by MOCVD semiconductor epitaxy process. At present, there are two main methods: one is based on lattice matching (Lattice-mateched, LM) technology, which requires each stacked junction material and substrate material to realize crystallization. Lattice matching, which has great restrictions on the choice of materials; another metamorphic (MM) technology based on the introduction of a graded buffer layer to solve the problem of lattice mismatch between some PN junction materials and substrate materials. No matter which method is used, the PN junctions are connected in series through tunnel diodes, so the output current is limited by the PN junction with the minimum output current, and the part of the output of other PN junctions that is higher than the limited current will be used for heat generation. The temperature of the battery rises rapidly, which eventually leads to a decrease in the photoelectric conversion efficiency of the battery.
为了实现对多结层叠太阳能电池的优化设计，需要结合实际情况对其建立完善的理论模型，利用该模型对其性能进行分析，进而寻求优化的途径。多结层叠太阳能电池的性能与直射太阳光谱、聚光倍数、聚焦光斑均匀性、电池材料、结构及环境影响等诸多因素相关，因此需要结合具体的聚光太阳能光伏发电系统方案、综合多方面因素并针对实际应用条件对多结电池中的相关特性进行理论分析，寻求改进方案，从而提高聚光太阳能光伏发电系统的效率及可靠性。In order to realize the optimal design of multi-junction tandem solar cells, it is necessary to establish a perfect theoretical model in combination with the actual situation, use the model to analyze its performance, and then seek ways to optimize it. The performance of multi-junction tandem solar cells is related to many factors such as direct sunlight spectrum, concentration ratio, uniformity of focus spot, cell materials, structure and environmental impact, so it is necessary to combine specific concentrated solar photovoltaic power generation system solutions and comprehensive factors According to the actual application conditions, the relevant characteristics of the multi-junction cell are theoretically analyzed, and an improvement plan is sought to improve the efficiency and reliability of the concentrated solar photovoltaic power generation system.
发明名称Invention name
本发明的目的就在于提供一种针对多结层叠太阳能电池及聚光太阳能光伏发电系统理论分析方法，综合考虑多方面实际因素对其各方面性能进行全面分析，最终为电池及系统的优化设计方案提供理论依据。The purpose of the present invention is to provide a theoretical analysis method for multi-junction stacked solar cells and concentrating solar photovoltaic power generation systems, comprehensively considering various practical factors to conduct a comprehensive analysis of their performance in all aspects, and finally to optimize the design of the battery and system Provide a theoretical basis.
本发明所采取的技术方案是：一种聚光太阳能光伏发电系统的建模方法，其特征在于，包括以下步骤：The technical solution adopted by the present invention is: a modeling method of a concentrating solar photovoltaic power generation system, characterized in that it comprises the following steps:
步骤1：对聚光光学处理系统建立模型，将全球直射参考光谱数据导入模型中的太阳光源，合理设置太阳光源的光线数量，通过光线追迹得到聚光太阳能光伏发电系统中的多结电池接收表面的光谱数据及光强分布；Step 1: Build a model for the concentrating optical processing system, import the global direct sunlight reference spectral data into the solar light source in the model, reasonably set the number of rays of the solar light source, and obtain the reception of multi-junction cells in the concentrating solar photovoltaic power generation system through ray tracing Surface spectral data and light intensity distribution;
步骤2：针对聚光太阳能光伏发电系统中所用的单个多结电池建立等效电路模型，该等效电路模型以聚光倍数C和电池工作温度T作为其输入变量，利用实际测量的单个多结电池I-V曲线对其等效电路模型中的未知参数进行拟合，提取有效参数值，这些参数值对于较宽范围内的C和T均适用；Step 2: Establish an equivalent circuit model for a single multi-junction cell used in a concentrated solar photovoltaic power generation system. The equivalent circuit model takes the concentration factor C and the cell operating temperature T as its input variables, and uses the actual measured The battery I-V curve fits the unknown parameters in its equivalent circuit model to extract effective parameter values, which are applicable to a wide range of C and T;
步骤3：利用实际测量的特定温度下多结电池各结子电池的外量子效率数据和步骤1中得到的多结电池接收表面的辐照光谱数据计算多结电池各结的短路电流Isci，其中，SC是短路的缩写，i为多结电池PN结序号，i＝1,2，...,n,并将其作为输入数据代入步骤2得到的等效电路模型，算出单个多结电池的开路电压和最大输出功率，进而根据聚光太阳能光伏发电系统中的各个多结电池的串联及并联连接情况计算聚光太阳能光伏发电系统中的开路电压和最大输出功率Pomax；Step 3: Calculate the short-circuit current I sci of each junction of the multi-junction battery using the actual measured external quantum efficiency data of each junction sub-cell of the multi-junction battery at a specific temperature and the radiation spectrum data of the receiving surface of the multi-junction battery obtained in step 1, where , SC is the abbreviation of short circuit, i is the PN junction number of the multi-junction battery, i=1, 2, ..., n, and substitute it into the equivalent circuit model obtained in step 2 as input data to calculate the single multi-junction battery Open circuit voltage and maximum output power, and then calculate the open circuit voltage and maximum output power P omax in the concentrated solar photovoltaic power generation system according to the series and parallel connections of each multi-junction battery in the concentrated solar photovoltaic power generation system;
步骤4：利用全球直射光谱数据计算聚光太阳能光伏发电系统中的输入光功率Pin，并计算得到聚光太阳能光伏发电系统的系统效率和系统发电量∫Pin(t)dt。Step 4: Calculate the input optical power P in of the concentrated solar photovoltaic power generation system by using the global direct sunlight spectrum data, and calculate the system efficiency of the concentrated solar photovoltaic power generation system and system power generation ∫P in (t)dt.
作为优选，步骤1中所述的对聚光光学处理系统建立模型，是利用ZEMAX光学软件对聚光光学处理系统建立模型。Preferably, the modeling of the concentrating optical processing system described in step 1 is to use ZEMAX optical software to model the concentrating optical processing system.
作为优选，步骤1中所述的将全球直射光谱数据导入模型中的太阳光源，是将美国国家可再生能源实验室的官方网站颁布的AM1.5D ASTM G173-03全球直射参考光谱数据导入模型中的太阳光源。As a preference, the solar light source described in step 1, which imports the global direct sunlight spectrum data into the model, is to import the AM1.5D ASTM G173-03 global direct sunlight reference spectrum data into the model issued by the official website of the National Renewable Energy Laboratory of the United States sun light source.
作为优选，步骤1中所述的合理设置太阳光源的光线数量，合理设置的评价标准是既要确保得到的结果准确、又要确保每次追迹的时间最短，光线数量越多时结果越精确，光线数量越少时追迹时间越短，因此要寻找合适的光线数量。As a preference, in step 1, the number of light rays of the sun light source is set reasonably. The evaluation criteria for reasonable setting is to ensure the accuracy of the obtained results and to ensure that the time for each trace is the shortest. The more the number of light rays, the more accurate the result. The smaller the number of rays, the shorter the tracing time, so it is necessary to find a suitable number of rays.
作为优选，步骤2中所述的针对聚光太阳能光伏发电系统中所用的单个多结电池建立等效电路模型，是利用PSPICE电路仿真软件针对聚光太阳能光伏发电系统中所用的单个多结电池建立等效电路模型。As a preference, the establishment of an equivalent circuit model for the single multi-junction battery used in the concentrated solar photovoltaic power generation system described in step 2 is to use the PSPICE circuit simulation software to establish an equivalent circuit model for the single multi-junction battery used in the concentrated solar photovoltaic power generation system Equivalent circuit model.
本发明可以对整个聚光太阳能光伏发电系统进行建模和性能仿真，最终得到系统的发电效率和发电量。另外，该方法可以为多结层叠太阳能电池及聚光太阳能发电系统的前期设计提供理论依据。The invention can carry out modeling and performance simulation on the whole concentrating solar photovoltaic power generation system, and finally obtain the power generation efficiency and power generation amount of the system. In addition, this method can provide a theoretical basis for the preliminary design of multi-junction stacked solar cells and concentrated solar power generation systems.
根据本发明所述方法，可以得到多结电池表面的光谱特性和光强数据，这将有助于多结电池各结材料的选择及系统结构的设计，优化各结子电池的光谱响应，在多结电池实现宽谱接收的同时，使得各结子电池的短路电流能够尽量匹配。According to the method of the present invention, the spectral characteristics and light intensity data of the surface of the multi-junction battery can be obtained, which will help the selection of each junction material of the multi-junction battery and the design of the system structure, and optimize the spectral response of each junction battery. While the junction cell realizes wide-spectrum reception, the short-circuit current of each junction cell can be matched as much as possible.
附图说明Description of drawings
图1：是本发明现有技术的多结层叠太阳能电池原理示意图；Fig. 1: is the schematic diagram of the multi-junction stacked solar cell principle of the prior art of the present invention;
图2：是本发明的建模流程图；Fig. 2: is the modeling flowchart of the present invention;
图3：是本发明实施例的基于三结层叠电池的聚光太阳能光伏发电单元模型；Fig. 3: is the concentrating solar photovoltaic power generation unit model based on the triple-junction laminated cell according to the embodiment of the present invention;
图4：是本发明实施例的三结层叠电池的聚光太阳能光伏发电单元光线追迹效果图；Figure 4: It is the ray tracing effect diagram of the concentrating solar photovoltaic power generation unit of the triple-junction laminated battery according to the embodiment of the present invention;
图5：本发明实施例的光学模型的输入光谱数据(AM1.5D ASTM G173-03)和通过该模型处理之后三结电池表面接收的辐照光谱数据；Figure 5: The input spectral data (AM1.5D ASTM G173-03) of the optical model of the embodiment of the present invention and the irradiance spectral data received by the surface of the triple-junction cell after being processed by the model;
图6：是本发明实施例的三结层叠太阳能电池等效电路模型示意图；Figure 6: is a schematic diagram of an equivalent circuit model of a triple-junction stacked solar cell according to an embodiment of the present invention;
图7：是本发明实施例的GaInP/GaInAs/Ge三结层叠电池I-V曲线拟合结果；Fig. 7: is the I-V curve fitting result of the GaInP/GaInAs/Ge triple-junction laminated battery of the embodiment of the present invention;
图8：是本发明实施例的GaInP/GaInAs/Ge三结层叠电池各结子电池短路电流的计算结果；Figure 8: is the calculation result of the short-circuit current of each junction cell of the GaInP/GaInAs/Ge triple-junction laminated battery according to the embodiment of the present invention;
图9-1：是本发明实施例的利用本发明的模型及相关参数计算得到的聚光太阳能光伏发电系统开路电压随电池温度的变化曲线；Figure 9-1: It is the variation curve of the open circuit voltage of the concentrating solar photovoltaic power generation system with the temperature of the battery calculated by using the model of the present invention and related parameters according to the embodiment of the present invention;
图9-2：是本发明实施例的利用本发明的模型及相关参数计算得到的聚光太阳能光伏发电系统最大输出功率随电池温度的变化曲线；Figure 9-2: It is the curve of the maximum output power of the concentrating solar photovoltaic power generation system calculated by using the model of the present invention and related parameters according to the embodiment of the present invention with the temperature of the battery;
图9-3：是本发明实施例的利用本发明的模型及相关参数计算得到的聚光太阳能光伏发电系统效率随电池温度的变化曲线。Fig. 9-3 is the variation curve of the efficiency of the concentrating solar photovoltaic power generation system with the temperature of the battery calculated by using the model of the present invention and related parameters according to the embodiment of the present invention.
具体实施方式detailed description
为了便于本领域普通技术人员理解和实施本发明，下面结合附图及实施例对本发明作进一步的详细描述，应当理解，此处所描述的实施示例仅用于说明和解释本发明，并不用于限定本发明。In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.
请见图2，本发明所采用的技术方案是：一种聚光太阳能光伏发电系统的建模方法，包括以下步骤：Please see Fig. 2, the technical scheme adopted in the present invention is: a kind of modeling method of concentrating solar photovoltaic power generation system, comprises the following steps:
步骤1：利用ZEMAX光学软件对聚光光学处理系统建立模型，将美国国家可再生能源实验室的官方网站颁布的AM1.5D ASTM G173-03全球直射光谱数据导入模型中的太阳光源，合理设置太阳光源的光线数量，通过光线追迹得到聚光太阳能光伏发电系统中的多结电池接收表面的光谱数据及光强分布；其中合理设置的评价标准是既要确保得到的结果准确、又不能让每次追迹耗费的时间过长，光线数量越多时结果越准确，光线数量越少时追迹时间越短，因此要寻找合适的光线数量。Step 1: Use ZEMAX optical software to build a model for the concentrating optical processing system, import the AM1.5D ASTM G173-03 global direct sunlight spectral data issued by the official website of the National Renewable Energy Laboratory into the solar light source in the model, and set the sun reasonably The number of light rays from the light source, the spectral data and light intensity distribution of the receiving surface of the multi-junction cell in the concentrating solar photovoltaic power generation system are obtained by ray tracing; the evaluation criteria that are reasonably set are to ensure that the results obtained are accurate, and do not allow each It takes too long to trace once. The more the number of rays is, the more accurate the result is. The less the number of rays is, the shorter the tracing time is. Therefore, it is necessary to find a suitable number of rays.
步骤2：利用PSPICE电路仿真软件针对聚光太阳能光伏发电系统中所用的单个多结电池建立等效电路模型，该等效电路模型以聚光倍数C和电池工作温度T作为其输入变量，利用实际测量的单个多结电池I-V曲线对其等效电路模型中的未知参数进行拟合，提取有效参数值，这些参数值对于较宽范围内的C和T均适用；Step 2: Use PSPICE circuit simulation software to establish an equivalent circuit model for a single multi-junction cell used in a concentrating solar photovoltaic power generation system. The equivalent circuit model uses the concentration factor C and the cell operating temperature T as its input variables. The measured I-V curve of a single multi-junction cell is fitted to the unknown parameters in its equivalent circuit model to extract effective parameter values, which are applicable to a wide range of C and T;
步骤3：利用实际测量的特定温度下多结电池各结子电池的外量子效率数据和步骤1中得到的多结电池接收表面的辐照光谱数据计算多结电池各结的短路电流Isci其中，SC是短路(short circuit)的缩写，i为多结电池PN结序号，i＝1,2，...,n,并将其作为输入数据代入步骤2得到的等效电路模型，算出单个多结电池的开路电压和最大输出功率，进而根据聚光太阳能光伏发电系统中的各个多结电池的串联及并联连接情况计算聚光太阳能光伏发电系统中的开路电压和最大输出功率Pomax；Step 3: Calculate the short-circuit current I sci of each junction of the multi-junction battery by using the actual measured external quantum efficiency data of each junction sub-cell of the multi-junction battery at a specific temperature and the radiation spectrum data of the receiving surface of the multi-junction battery obtained in step 1. SC is the abbreviation of short circuit, i is the serial number of the PN junction of the multi-junction battery, i=1, 2, ..., n, and substitute it into the equivalent circuit model obtained in step 2 as input data to calculate a single multi-junction The open circuit voltage and the maximum output power of the junction cell, and then calculate the open circuit voltage and the maximum output power P omax in the concentrated solar photovoltaic power generation system according to the series and parallel connections of each multi-junction cell in the concentrated solar photovoltaic power generation system;
步骤4：利用全球直射光谱数据计算聚光太阳能光伏发电系统中的输入光功率Pin，并计算得到聚光太阳能光伏发电系统的系统效率和系统发电量∫Pin(t)dt。Step 4: Calculate the input optical power P in of the concentrated solar photovoltaic power generation system by using the global direct sunlight spectrum data, and calculate the system efficiency of the concentrated solar photovoltaic power generation system and system power generation ∫P in (t)dt.
请见图3，是本发明实施例的基于三结层叠电池的聚光太阳能光伏发电单元模型；垂直入射太阳光通过玻璃1和SOG菲涅尔透镜2进入聚光单元，经过菲涅尔透镜的光线直接会聚并在透镜焦点位置聚焦，而经过玻璃入射的光线通过抛物面反射镜3进一步反射到菲涅尔透镜的焦点处。所有会聚到透镜焦点处的光线经过二次光学单元4进行匀光处理，进而入射到三结电池组件5上的电池表面，同时带散热翅片的热沉6与三结电池组件的陶瓷覆铜基板紧密接触，通过热沉6控制电池的工作温度；其光线追迹效果请见图4，垂直入射光线通过菲涅尔透镜及抛物反射镜面进行有效地会聚，进而经过二次匀光单元处理入射到电池表面。Please see Fig. 3, which is a model of a concentrating solar photovoltaic power generation unit based on a triple-junction laminated cell according to an embodiment of the present invention; vertically incident sunlight enters the concentrating unit through glass 1 and SOG Fresnel lens 2, and passes through the Fresnel lens The light rays are directly converged and focused at the focal point of the lens, while the light incident through the glass is further reflected to the focal point of the Fresnel lens by the parabolic reflector 3 . All the light rays converging to the focal point of the lens are uniformly treated by the secondary optical unit 4, and then incident on the battery surface on the triple-junction battery assembly 5. The substrates are in close contact, and the working temperature of the battery is controlled by the heat sink 6; the ray tracing effect is shown in Figure 4. The vertically incident light is effectively converged through the Fresnel lens and the parabolic reflector, and then the incident light is processed by the secondary uniform light unit. to the battery surface.
请见图5，是本发明实施例的光学模型的输入光谱数据(AM1.5D ASTM G173-03)和通过该模型处理之后三结电池表面接收的辐照光谱数据，聚光光学处理系统对入射DNI辐照数据的影响，这种影响不仅体现在总体光强度上，还体现在光谱特性的改变。Please see Fig. 5, which is the input spectral data (AM1.5D ASTM G173-03) of the optical model of the embodiment of the present invention and the radiation spectral data received by the surface of the triple-junction cell after the model is processed, and the concentrating optical processing system is for the incident The impact of DNI irradiance data is not only reflected in the overall light intensity, but also in the change of spectral characteristics.
请见图6，是本发明实施例的三结层叠太阳能电池等效电路模型示意图；本实施例用双二极管模型等效三结电池中的各结子电池，三结电池等效为三个子电池的串联连接。这里的Rs1-Rs3分别为三个子电池的串联电阻，用于表征各结子电池中的串联损耗。Rsh1-Rsh3分别为三个子电池的并联电阻，用于表征各结子电池中的反向漏电流。二极管D11—D31分别用来表征三个子电池内中性区的载流子复合机制，二极管D12—D32分别用来表征三个子电池内耗尽区和边界区的载流子复合机制。Please see Fig. 6, which is a schematic diagram of an equivalent circuit model of a three-junction stacked solar cell according to an embodiment of the present invention; in this embodiment, a double-diode model is used to equivalent each junction cell in a three-junction cell, and a three-junction cell is equivalent to three sub-cells connected in series. Here Rs1-Rs3 are the series resistances of the three sub-cells, which are used to characterize the series loss in each junction cell. Rsh1-Rsh3 are the parallel resistances of the three sub-cells, which are used to characterize the reverse leakage current in each junction cell. Diodes D11-D31 are used to characterize the carrier recombination mechanism in the neutral region of the three sub-cells, and diodes D12-D32 are used to characterize the carrier recombination mechanism in the depletion region and boundary region in the three sub-cells.
请见图7，是本发明实施例的GaInP/GaInAs/Ge三结层叠电池I-V曲线拟合结果；利用实际测量的三结电池I-V数据(图中离散方块)对电路模型参数进行拟合，图中的实线为拟合的I-V曲线，拟合过程采用L-M优化算法；拟合曲线与测量数据吻合度相当高，可证明模型参数的有效性。Please see Figure 7, which is the fitting result of the I-V curve of the GaInP/GaInAs/Ge triple-junction stacked battery according to the embodiment of the present invention; the circuit model parameters are fitted using the actually measured triple-junction battery I-V data (discrete blocks in the figure), as shown in Fig. The solid line in the figure is the fitted I-V curve, and the L-M optimization algorithm is used in the fitting process; the fitting curve is quite consistent with the measured data, which can prove the validity of the model parameters.
请见图8，是本发明实施例的GaInP/GaInAs/Ge三结层叠电池各结子电池短路电流的计算结果；本实施例给出特定条件(聚光倍数：500，电池温度：29℃)下计算出来的各结子电池的短路电流。利用图8中的计算结果及各结材料的温度系数可以得到其它温度条件下各结子电池的短路电流，并将其作为电路模型的输入变量。Please see Figure 8, which is the calculation result of the short-circuit current of each junction cell of the GaInP/GaInAs/Ge triple-junction laminated battery according to the embodiment of the present invention; this embodiment gives specific conditions (concentration ratio: 500, battery temperature: 29°C) The calculated short-circuit current of each junction cell. Using the calculation results in Figure 8 and the temperature coefficient of each junction material, the short-circuit current of each junction cell under other temperature conditions can be obtained, and it can be used as an input variable of the circuit model.
请见图9-1，是本发明实施例利用本发明的模型及相关参数计算得到的聚光太阳能光伏发电系统开路电压随电池温度的变化曲线；请见图9-2，是本发明实施例利用本发明的模型及相关参数计算得到的聚光太阳能光伏发电系统最大输出功率随电池温度的变化曲线；请见图9-3，是本发明实施例利用本发明的模型及相关参数计算得到的聚光太阳能光伏发电系统效率随电池温度的变化曲线。所述物理量随温度的变化曲线均在聚光倍数为500的条件下计算得到。系统的开路电压、最大输出功率、系统效率均具有负温度系数，即随着温度的升高，系统性能会逐步劣化。Please see Figure 9-1, which is the curve of the open circuit voltage of the concentrating solar photovoltaic power generation system calculated by using the model and related parameters of the present invention according to the embodiment of the present invention; please see Figure 9-2, which is the curve of the embodiment of the present invention The variation curve of the maximum output power of the concentrating solar photovoltaic power generation system with the temperature of the battery calculated by using the model and related parameters of the present invention; please see Figure 9-3, which is calculated by using the model and related parameters of the present invention according to the embodiment of the present invention Efficiency variation curve of concentrated solar photovoltaic power generation system with cell temperature. The variation curves of the physical quantities with temperature are all calculated under the condition that the concentration factor is 500. The open circuit voltage, maximum output power, and system efficiency of the system all have negative temperature coefficients, that is, as the temperature increases, the system performance will gradually deteriorate.
应当理解的是，本说明书未详细阐述的部分均属于现有技术。It should be understood that the parts not described in detail in this specification belong to the prior art.
应当理解的是，上述针对较佳实施例的描述较为详细，并不能因此而认为是对本发明专利保护范围的限制，本领域的普通技术人员在本发明的启示下，在不脱离本发明权利要求所保护的范围情况下，还可以做出替换或变形，均落入本发明的保护范围之内，本发明的请求保护范围应以所附权利要求为准。It should be understood that the above-mentioned descriptions for the preferred embodiments are relatively detailed, and should not therefore be considered as limiting the scope of the patent protection of the present invention. Within the scope of protection, replacements or modifications can also be made, all of which fall within the protection scope of the present invention, and the scope of protection of the present invention should be based on the appended claims.
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