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Photovoltaic power generation systems can be divided into two categories, namely space applications and ground applications, depending on the location of their use. It can be used as an independent power source on the ground, or it can be combined with a wind turbine generator or a diesel engine to form a hybrid power generation system. It can also be connected to a power grid to deliver power to the grid. Currently widely used photovoltaic power generation system is mainly used as an independent ground power supply. The general stand-alone photovoltaic power generation system is mainly composed of a solar cell array, a battery, a controller, and a blocking diode, and its functions are as follows:
1. Photovoltaic cell phalanx: The role of the phalanx is to convert solar radiant energy directly into electrical energy for use by the load. Generally, a number of solar cell modules are connected in a certain manner, and then are equipped with appropriate brackets and junction boxes.
2. Battery pack: A battery pack is an energy storage device of a solar cell array, and its role is to store the excess electric energy that the array emits during the sunshine, and to use it for the load in the evening or on rainy days. In the photovoltaic power generation system, the battery is in floating charge and discharging state, and the amount of sunshine in the summer is large. In addition to supplying electricity to the load, the battery is also charged. In winter, the amount of stored energy is gradually released, and this part of the stored energy is gradually released. On the basis of this, we must add a much smaller daily cycle. During the day, the square array charges the battery, (while the square array also supplies electricity to the load). At night, all the load power is supplied by the battery. Therefore, the self-discharge of the battery is required to be small, and the charging efficiency is high, and at the same time, it is also necessary to consider factors such as price and ease of use. Commonly used batteries include lead-acid batteries and silicone batteries, and nickel-cadmium batteries, which are relatively expensive, are also required for higher applications.
3. Controllers: The controllers in different types of photovoltaic power generation systems are different, and their functions and complexity are very different. They need to be determined according to the requirements and importance of the power generation system. The controller consists of electronic components, meters, relays, switches, etc. In a simple solar battery and battery system, the role of the controller is to protect the battery and avoid overcharging and overdischarging. If the photovoltaic power station is connected to the grid, the controller needs to have various functions such as automatic monitoring, control, regulation, and conversion. If the load uses alternating current, inverters should also be provided between the load and the battery. The role of the inverter is to reverse the low voltage DC power provided by the square array and the battery to 220 volts AC, which is used by the load.
4. Blocking diodes: Also known as back-charged diodes or blocking diodes, their role is to use the unidirectional conductivity of the diodes to prevent the battery from discharging through the solar cell squares without sunlight. The requirement for a blocking diode is that the operating current must be greater than the maximum output current of the square array and the reverse withstand voltage is higher than the battery pack voltage. When operating in a square matrix, there is a certain voltage drop across the blocking diode, typically 0.6V to 0.8V for silicon diodes; and about 0.3V for Schottky or germanium.
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