Research On Control Method Of Speed Sensorless Permanent Magnet Synchronous Generator

With shortage of renewable energy, renewable energy sources are increasingly subject to human pursuit, and wind power generation in the new energy power generation also gradually occupy a large proportion. Permanent magnet synchronous wind power generation technology because it has the advantages of simple structure, easy maintenance, low cost, high reliability and other advantages, so it in the field of wind power generation technology occupy half of the country. But permanent magnet motor rotates in rely mainly on mechanical sensor motor power angle and speed to come over, but mechanical sensor has increased system cost, so that the whole system reliability is greatly reduced, so permanent magnet synchronous generator technology is more and more used without speed sensor to Replace mechanical sensors.Firstly,This paper briefly describes the actuality and trend of the development of wind energy technology, explains the two types of wind power generation unit in the technology of variable speed constant frequency (VSCF) mode of operation. The development process and future trend of the control technology of the speed sensorless control technology of the permanent magnet synchronous motor are also described.Then,a more precise mathematical model of permanent magnet synchronous generator is setting.All the coordinates transformation matrix equation and permanent magnet synchronous generator under three kinds of coordinates corresponding mathematical model are described in detail; in-depth analysis of the permanent magnet synchronous motor vector control method and the principle of application. In order to improve the control performance of the sensorless PMSG control system, this paper also introduces a speed sensorless PMSG control method considering the influence of the dead zone. Considering the influence of the dead time of voltage source inverter output voltage, the mathematical model of the inverter was made, according to the establishment of this model, the current regulation of output voltage given value correction and the algorithm is simple and robust good anti electromotive force method and phase locked loop technique to estimate the rotor position and speed, to further improve the non speed sensor control accuracy.Finally, in order to verify the theoretical analysis is correct, according to the control method presented in this paper were simulation and experimental verification. Software design of control system based on the hardware of the inverter. After small power generation and the electric experiment, confirmed the adopted based on the correctness and feasibility of the control method of back EMF and phase-locked loop with zero d-axis current vector control.