Battery Type Selection And Operation Corresponding Mode

There are many types of batteries. At present, wind power is commonly used in lead-acid batteries. After the battery is filled with liquid, after 30 minutes, it can be used when the liquid temperature is 15C, and no initial charging is required. For remote places where the wind turbines have just been installed and do not have the initial charging conditions, electricity can be used immediately, which is very advantageous. The disadvantage of this kind of battery is its large size and weight, and it is inconvenient to carry. Most of the aluminum-acid batteries sold in the market are batteries for motor vehicle start-up. The plate structure and manufacturing characteristics are not suitable for use under the charging and discharging operation conditions of wind power generation. The service life is short, generally only about 2 to 3 years. In a wind power station with a larger capacity, it is best to use a fixed acid-proof and explosion-proof lead battery. This battery has a large capacity and a low electro-hydraulic specific gravity (approximately 1.21 at 15°C). The corrosion of the partition can extend the evaporation time, and there are anti-leakage measures to reduce the discharge to the ground.

Alkaline batteries are small in size. It is light in weight and has a service life of about 15 years. It is also used in a small amount in our area. Although the life of alkaline batteries is 5-7 times longer than that of acid batteries, their price is 10 times higher than that of acid batteries. From an economic point of view, we believe that it is more advantageous to use lead-acid batteries in small wind power generation.

Three operating modes of battery

1. Full charge and full release system. That is, the fans are installed centrally, charged centrally, and the batteries are distributed to each household, and two batteries are used in rotation for each household.

Wind power is restricted by wind, especially for small wind turbines. In the village where the wind is small, the fans must be installed centrally outside the village, and this method is suitable for rural areas and Haote where wiring is difficult. The wind turbine can be installed on a site with better wind energy to make full use of wind energy. Battery rotation can ensure full discharge. weakness is:

① More batteries are needed, which increases investment and electricity cost. ②The battery use efficiency is low (about 40%). ③Frequent charging and discharging cycle of the battery, short service life.

④ Moving the battery back and forth frequently causes trouble to the user, and it is easy to damage the battery; careless handling can cause the electrolyte to leak out, which will cause the battery to run out of liquid or burn clothes.

2. Semi-floating charging operation mode. It is the working mode of the fan (DC power generation) and the battery power supply in parallel. When not using electricity (during the day), the battery is charged by the wind turbine; when there is no wind, the battery supplies power to the load; when there is wind, the fan generates the floating battery and supplies power. This method is mostly used for single-machine 1-3 households, and the capacity of the configured raspberry battery is less, and the investment is reduced accordingly. The battery life of the semi-float charging system is generally longer than that of the full charge and full discharge system, and the efficiency of the battery is about 50%.

3. Full float charging system. Centrally install the batteries in the charging room, and connect the battery pack and the wind generator to the load circuit in parallel, so that the battery is constantly charged with low current. When the fan is supplying power to the load, the voltage fluctuation caused by the wind speed fluctuation plays a stabilizing role through the battery pack to ensure the normal power supply. This operating mode has a longer battery life than the above two modes, and the required battery capacity is greatly reduced, the power efficiency is improved, and the battery maintenance is simplified. The efficiency of the entire power supply equipment can reach 60-70%. The Hanbula Wind Power Station in Chayouhouqi adopts this method.