Author ：Iflowpower – Portable Power Station Supplier
1.0 Introduction Photovoltaic system varies in the form of different forms, such as the system scale span, solar garden lamp, large to 0.3 ~ 2W, large to MW-level solar photovoltaic power station.
Its application form is also widely used in many fields such as household, transportation, communication, and space applications. Although the size of the photovoltaic system is different, its composition structure and work principle are basically the same. This article will briefly introduce the photovoltaic system structure, and focus on its power calculation method.
2.0 Composition of photovoltaic systems 1. Solar cell module: Solar cell module (also known as photovoltaic module) in accordance with the system requirements string, in parallel, converting solar energy into electrical energy output under solar light, it is the core component of the solar photovoltaic system.
2. Battery: Store the electrical energy of the solar cell module, when the light is insufficient or evening, or the load demand is greater than the power sent by the solar cell module, the storage power is released to meet the energy demand of the load, which is a solar photovoltaic system. Energy storage.
At present, the solar photovoltaic system is commonly used by lead-acid batteries. The system regarding higher requirements, typically uses a deep-discharged valve controlled lead-acid battery, deep discharge liquid-liquid lead-acid battery, etc. 3.
Controller: It specifies and controls the charging of the battery, and controls the energy output of solar cell modules and battery-to-load according to the load power supply requirements, which is the core control section of the entire system. With the development of the solar photovoltaic industry, the controller's function is increasing, there is a trend of integration of traditional control parts, inverters, and monitoring systems, such as AES's SPP and SMD series of controllers integrated three Function. 4.
Inverter: In the solar photovoltaic power supply system, if the AC load is contained, the inverter device is used to convert the DC power of the solar cell module or the battery-released direct current to the load. The basic working principle of the solar photovoltaic power supply system is to charge the electric energy of the solar cell assembly through the controller's control to the battery, which is directly supplied to the load, if the load demand is met, if the sunshine is insufficient or at night The battery is powered by the battery under the control of the controller. About the photovoltaic system containing the AC load, it is also necessary to add the inverter to convert DC electrical conversion to transition.
The application of the photovoltaic system has a variety of forms, but the basic principle is small. 3.0 Solar Battery Component Power Calculation Method Solar power generation capacity refers to the power generation power of solar cell modules WP.
The amount of power generation power depends on the power H (WH) that can be consumed by the load 24h. The power consumed by the load is rated and the load 24h, which determines the capacity P (AH) consumed by the load 24h, and then considering the average daily time And the effects of rainy days, calculate the solar battery array working current IP (a). From the load rated power source, the battery nominal voltage is selected, and the battery is nominal voltage to determine the battery series and the battery floating voltage Vf (V), and then the temperature rise voltage Vt (V) caused by the temperature rise due to temperature increases.
The effect of the pressure drop VD (V) of the anti-charge diode Pn junction can calculate the operating voltage Vp (V) of the solar cell array, and the power supply IP (a) and the operating voltage Vp (V) by the solar cell array. The solar cell module power generation power WP (W) can be determined, thereby designing the capacity of solar cell modules, and determines the number of series blocks of the solar cell module and the number of parallel groups of the solar cell module by the designed capacity WP and the solar cell module.
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