![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
The water pumping efficiency of the wind power water-lifting wind turbine is more than twice that of the mechanical water-lifting wind turbine. The maintenance of the system is extremely small, and the installation position between the wind turbine and the water pump is large, and it is very broad in the use of wind energy. Prospects. In today's countries, more and more wind power water-lifting wind turbines have replaced mechanical water-lifting wind turbines, which are widely used in farmland irrigation, residential water, livestock and drinking water. In the wind power pumping system, the electric energy generated by the wind turbine is variable frequency and variable pressure, so the motor-water pump unit operates at a variable speed. To increase the efficiency of the system, it is necessary to stabilize the wind turbine at a wide range of wind speeds, especially at high wind speeds. The electric controller is connected between the wind turbine and the pump load, and the compensation capacitor and the unloading load are dynamically connected in parallel, and the cutting and cutting parameters (voltage, frequency, voltage-to-frequency ratio) are correctly selected, and the efficiency of the wind power lifting wind turbine can be selected. Apparently improved.
2 The condition of stable operation of small wind power lifting system must maintain the following power and torque balance equations in order to maintain stable operation.
It is the electromagnetic torque of the motor; Tz is the load torque of the pump; Toi is the loss torque of the generator; TO2 is the loss torque of the pump.
3 Parameter Analysis of Small Wind Power Lifting System According to the system's power balance equation and torque balance equation, the influence of wind speed and generator terminal voltage and frequency on system operation can be analyzed.
The speed v is added, and the output voltage U or current I of the generator is rapidly added. In order to make the generator not too hot, I should not exceed the rated current of the generator for a long time. When the wind speed is over, it is desirable to increase the voltage at the generator terminal.
The load current If or the internal resistance rF of the generator is increased to decrease. To maintain the voltage-to-frequency ratio, the current and temperature rise of the generator should not exceed the rated value. Dynamically paralleling the appropriate compensation capacitors and unloading loads in the system limits the current and temperature rise of the generator. Keep the pressure-to-frequency ratio of the wind power pumping system near the rated pressure-to-frequency ratio (220/50 = 4.4), the system runs most stable and the water-lifting efficiency is high. Under normal circumstances, the system's voltage-to-frequency ratio should not be lower than 3. 5 small wind power pumping system example 51 system configuration The 10kWFS7-PDM3 wind turbine produced by Xiangtan Boli Wind Energy Co., Ltd. is a typical small wind power water lifting system.
In the test project, with a 15 pole, 90m head deep well pump, the motor power is 5. 6kW, the pump power is 3. Fixed compensation capacitor Ci = 55F, dynamic input capacitor C2 = 75MF, dynamic input unloading load R2 (1kW220V). The controller monitors the system frequency, terminal voltage, voltage-to-frequency ratio, and parameter settings as follows: 1 low cut-out frequency (because the wind power frequency is too low, the controller cuts off the wind power frequency of the wind turbine to the motor-pump unit) 30Hz.2 low cut-in frequency (The controller allows the wind turbine to start the power supply to the motor-pump unit with minimum wind power frequency): 40Hz. High cut-out frequency (because the wind power frequency is too high, the controller cuts off the wind power frequency of the wind turbine to the motor-pump unit): 90Hz. High reset frequency (after the wind power frequency exceeds the high cut-out frequency, the controller restores the wind power frequency that the wind turbine must reach for the motor-pump unit) 70Hz.5Q2 closing frequency: 50Hz; cut-out frequency-to-frequency ratio: 3.1. 2 test Results In the field test, the online rate, water flow rate, power, and frequency-to-frequency ratio of the system were tested. System online means that the system continuously pumps water. It is an online rate curve. The online rate of the wind speed from 6 to 15 m/s is very high, and the system runs stably. Is the flow rate curve, the wind speed from 4 to 13. 5m / s flow rate with the wind speed synchronously faster, the maximum value of 11.8m3 / h, the system's water lifting efficiency is high. It is the power curve. The wind speed is increased from 4 to 13.5m/s with the wind speed. The maximum unloading resistance of 11kW.3kW absorbs excess energy. It is a voltage-to-frequency ratio curve. The wind speed is from 6 to 11 m/s, and the voltage-to-frequency ratio is above 4.3 (close to the rated voltage-to-frequency ratio of 4.4), especially in high winds (v is 11~15 m/s). Improve, so that the motor can provide enough torque at high speed to ensure stable operation of the system over a wide range of wind speeds.
6 Conclusion Small wind power water lifting wind turbine has high efficiency, simple system structure, flexible installation, minimal maintenance and high reliability. Internationally, it is an advanced wind pumping system. In the vast northwestern region of China, drought and little rain, many villages have not yet been electrified, people's living conditions are very difficult, but the region's wind resources are very rich. The use of small wind power water-lifting wind turbines to extract groundwater for production and life can improve their quality of life and meet the national strategic decision to develop the northwest. Therefore, small wind power water-lifting wind turbines have extremely broad application prospects in China.
Sleep Wear,Sleepwear Sets,Best Sleepwear,Family Sleepwear
Zedote SCM (Shanghai)Co., Ltd , https://www.zerodowntech.com