Development of 300kW Variable Speed ​​Wind Turbine
1 The front S AC excitation variable speed power generation technology can change the frequency of the motor excitation current, so that the unit can run at the optimal speed t to improve the operating efficiency of the unit, and the operation of the large unit can help the unit to stabilize. Due to its unique advantages, this technology has similarities in the operation of hydroelectric generating units in foreign countries. As the season changes, the motive force (wind volume, wind speed, etc.) often changes greatly. If the wind turbine can operate at a higher speed of wind energy utilization under different wind energy conditions, it will also bring many benefits to energy utilization and stable operation of the unit.
For the characteristics of the AC excitation variable speed generator, combined with the fan generator set. In the operating conditions, the AC excitation variable speed generator is applied to the wind turbine, which will make full use of the advantages of the AC excitation variable speed generator to make the wind power technology leap to a new level.
300kW AC-excited variable-speed wind turbine, which will be used for large-scale wind power generation in the National Engineering Research Center for Power Generation Equipment. The vector diagram is as shown. The corresponding basic equations are stator current, excitation current and rotor return current respectively. From the energy relationship, the electromagnetic power of the motor is: when it is 0, the rotor of the motor is sub-synchronous, and the household 2>0, the rotor will be The grid absorbs power. When 5<0, the motor rotor is super synchronous, p2 Analysis result of 3300kW AC excitation variable speed generator 3.1 Main parameters and structural characteristics of generator Rated power (kw) Efficiency (%) Rated power factor (%) Rated voltage (V) Rated frequency (Hz) Synchronous speed (r/min) Rotational speed range (r/min) Rotor voltage (V) G=0.1) Rotor current (A) The overall structure of the generator is similar to that of a wound asynchronous motor. The motor base is made of cast iron, and the protection grade is IP23. The stator adopts three-phase double-layer winding, the rotor adopts hidden pole two-phase double-layer winding and four slip rings to make the rotor phases supply independently. The rotor winding profile of a unit motor and the rotor winding potential map are given. 3.2 Excitation calculation of asynchronous working condition When the speed adjustment range is *10% of the rated speed, if the rated output of the generator and the power factor are kept unchanged, the excitation capacity can be calculated according to the equivalent circuit. The relationship between the excitation voltage and the rotor frequency is shown in the following curve. When 5=0.10, the rotor current is 41.2A, and the excitation voltage is 3.3. The analysis of the air gap waveform is due to the particularity of the structure and operation principle of the AC excitation variable speed generator. Simple application of the traditional design method will bring greater error. We are based on traditional design methods. The electromagnetic field finite element analysis method was adopted for some key parameters. For the unit motor split, the field distribution Hf! , Pavilion 7 is a magnetic dense distribution 1 丨 line. By means of the unwinding winding method, the air gap is not densely fitted. The rotor structure and the electric field 7-wave waveform 1* number are optimized to determine the rotor structure and parameters. 4 Summary The AC excitation variable speed generator technology is applied to wind power generation with many advantages, and the wind energy utilization coefficient can be improved, which can effectively improve the characteristics and efficiency of the system. The 3kVl AC excitation variable-speed generator rotor set in this paper adopts TI two-phase orthogonal winding for control and measurement t; the rotor excitation capacity is only 30kW, so that the capacity of the excitation variable frequency power supply is greatly reduced, so Significantly reduce equipment investment. The combination of the traditional design and the electromagnetic field finite element analysis used in this paper can make a more accurate analysis of the 甩-type motor and is easy to use.
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