①Basic structure of wind-solar complementary LED street light
Wind-solar complementary LED street lights have the dual advantages of wind energy and solar products. When there is no wind energy, solar cell components can be used to generate electricity and the electricity can be stored in the battery. When there is wind energy and no solar energy, it can be generated by a wind turbine to store electricity. In the battery. When both wind and solar energy are available, they can generate electricity at the same time. It can use sunlight and wind resources to generate electricity during the day, and use wind generators to generate electricity at night, which makes up for the unity of wind power or solar power, and makes the power supply system more stable and reliable. Wind-solar complementary LED street lights do not require manual operation, and can be intelligently controlled according to the brightness of the sky.
The structure diagram of the wind-solar complementary LED street light is shown in Figure 1. The wind-solar complementary LED street light is composed of a wind generator, a solar panel (including a bracket), a controller, a battery, a light source and a light pole. Solar panels (including brackets), batteries, light sources and light poles are basically the same as solar LED street lights.
The block diagram of 24V DC wind-solar complementary LED street light is shown in Figure 2. The wind turbine and solar panel charge the battery through the intelligent controller, and then the intelligent controller intelligently controls the 2V DC light source to turn on and off.
Generally, wind turbines with wind-solar complementary LED street lights use five-blade wind wheels to achieve low wind speed start, dynamic imbalances cancel each other, and the operation is more stable and reliable, which effectively solves the safety hazards caused by strong wind, unstable wind speed and wind direction. Reduce the blade tip speed ratio to reduce the force on the blades, ensure the smooth operation of the fan blades, and reduce vibration and noise.
When the wind speed is less than the start-up wind speed of the wind turbine, the wind turbine cannot rotate. After the wind speed reaches the starting wind speed, the fan starts to rotate, driving the generator to generate electricity. The output power is supplied to the load and the battery is charged. When the wind speed exceeds the cut-off wind speed, the wind turbine uses the speed limiting mechanism to make the wind turbine run at a certain speed or stop running at a certain speed to ensure that the wind turbine will not be damaged.
Wind turbines with wind-solar hybrid LED street lights optimize the design of the space inclination angle between the rudder and the revolving body, accurately calculate the size of the rudder, rationally design the weight and distribution of the rudder, and optimize the shape design. When the wind is small, rely on the tail rudder gravity to control the windward direction of the wind turbine blades to achieve the purpose of starting at low wind speeds, and to control the axis of the wind turbine and the axis of the light pole slewing body. When the wind exceeds the rated wind speed, pass through the space. The angle of the tail rudder is appropriately adjusted to make the blades windward angle the most reasonable to achieve the purpose of deceleration. The swing of the tail rudder enables the wind turbine to absorb wind energy more reasonably and improve the safety performance of the entire system. When the wind speed is too high, the wind wheel will minimize the windward area and absorb less wind energy by turning the tail rudder, so as to avoid damage to the entire system caused by strong wind.
The power of wind generators used in wind-solar complementary LED street lights is usually 300~500w. Fengli generators usually use permanent magnet direct-drive generators, which are composed of main engine, blades, hub, main shaft, wind deflector, and tail rudder. The whole machine has the characteristics of simple structure, light weight, good low-speed power generation performance, high reliability, and convenient installation and maintenance.
③Wind-light complementary LED street light controller
The wind-solar hybrid LED street light controller adopts microprocessor technology. Through the detection and judgment of battery voltage, ambient temperature, wind generator and solar battery output voltage and other parameters, it controls the on and off of various functions to achieve various functions. Control and protection functions. The function of the wind and solar hybrid controller is to control the working state of the entire system, and to protect the battery from overcharge and over discharge. In places with large temperature differences, the controller should also have the function of temperature compensation. Other additional functions include light control switch function and time control switch function. The intelligent wind-solar hybrid LED street light controller can intelligently adjust the output power of the light source according to the traffic flow on the road, which not only meets the use but also saves energy and reduces consumption: according to the strength of wind and solar energy, intelligent adjustment maximizes power generation and maximizes electrical energy storage.
The wind-solar hybrid LED street light controller uses normally closed contacts to ensure the safety of the system. In the case of strong wind, even if the relay is damaged, it can start the bleeder resistor and play a protective function. At the same time, a speed measuring device is added to the controller, and the principle of pulse frequency detection is used to precisely detect the speed of the wind turbine. When the predetermined speed is reached, the relay automatically switches the output of the wind turbine to the discharge resistor end to ensure that the wind turbine runs in high winds. Connect the discharge resistor in front to make the wind turbine brake and limit the speed in time. When the wind speed decreases and the speed of the wind turbine decreases to a predetermined value, the relay automatically switches the output of the wind turbine to the battery end to ensure that the wind turbine is sent to the battery in time Recharge.