Journal of Nanhua University (Science and Technology Edition) Research on Synchronous Generator New Brushless Excitation System Sheng Yifa, Deng Guoyang, Chen Wenguang, Wang Haoyu (School of Electrical Engineering, Nanhua University, Hengyang, Hunan 421001, China) The excitation system capable of inverter demagnetization. Photovoltaic systems and high speed switching devices are used. The detailed circuit is given in the paper, and the original excitation system and the new excitation system are compared. The excitation control system is an automatic control system composed of synchronous generator, excitation power unit and excitation regulator. It can be seen from the figure that the excitation regulator detects the voltage and current of the generator and other state quantities, and then sends a control signal to the excitation power unit according to a given adjustment criterion to realize the control function. Various proportional regulators in the operation of the power system, in the U (; b * U (; a range has the characteristics shown in the midline segment ab, that is, when the generator voltage Ug rises, the regulator is measured, minus Small output current. When Ug decreases, its output current increases. It cooperates with the exciter to control the rotor current of the generator to achieve automatic adjustment of the generator terminal voltage.
1.2 The principle of the new brushless excitation system is the principle wiring diagram of the new brushless excitation system. Its secondary exciter is a permanent magnet generator whose magnetic pole is rotating, the armature is stationary, and the AC exciter is just the opposite. The armature of the AC exciter, the thyristor rectifying element, and the excitation winding of the generator all rotate on the same axis, so no contact elements such as slip rings and brushes are required between them, which realizes brushless excitation.
At the same time, compared with the original brushless excitation system, the new exciter rotor is equipped with a high-speed switching device, an IGBT three-phase bridge, and its trigger circuit uses an optoelectronic system, that is, its trigger circuit is an optical ring that rotates on the shaft (tentatively known as The optical rotor) is equipped with a plurality of opposite pole excitation windings and a halo stationary part (temporarily called optical stator) on the stator of the exciter. The exciter controller accurately controls the information based on the integrated control signals and synchronous generator operating parameters. The trigger circuit is transmitted to the rotating IGBT bridge without error, and the inverter can be demagnetized.
3 The structure of the photovoltaic system is the basic structure of the photovoltaic system. The information source is measured after being processed by the optical system. It is received by the photodetector, outputted in the form of electricity, and then amplified by power to obtain a trigger pulse.
2 The selection of component parameters and the steps of the experiment are divided into two steps. The first step is that the single-phase static type, that is, the optical stator and the optical rotor are both stationary, so that the two can be reliably transmitted and received, and the IGBT can be reliably triggered. The second step is to use a 30W power-excited uncontrollable exciter. After a certain restructuring, it was converted into a brushless excitation system with a power of 30W and a voltage of 12V. The photoelectric system and the excitation power unit were installed on the coaxial rotor with ne=1400r/min. And with the Pw of 120W, Uo is 220V synchronous generator rotor winding, while removing the rotor winding brush, you get a new type of brushless excitation system synchronous power generation.
In the single-machine normal operation test, the power quality of the brushless excitation system and the new brushless excitation system are analyzed, and the latter is obviously superior to the former.
Phase difference (°) of the new brushless excitation system of brushless excitation system. Conclusions and problems. During the static experiment, the photoelectric system can accurately trigger the IGBT at a frequency of 0104 Hz by inputting control signals of different frequencies. New type of brushless The spatial geometry of the excitation system has yet to be further optimized. In particular, the spatial layout of the optical rotor and the optical stator is related to the reliability of the new exciter, especially in the case of high speed rotation.
The system does not yet have coordination considerations in many aspects such as regulator (AVR), stabilizer (PSS), and linear optimal excitation control (IDEC).
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