New High-efficiency Power Generation Using Position Sensor-less Permanent Magnet Synchronous Generator

Recently, wind power generation has attracted attention as a system using natural energy. The variable speed control of wind power generation using a permanent magnet synchronous generator (PMSG) is not required exciter and gear, so there is an advantage that low cost and low noise, but they cannot be operated stably because of large output fluctuations. Also, a position sensor for the rotation angle information is required, which is disadvantageous for maintenance and price. In order to solve these problems, this paper investigates a new control scheme that can efficiently generate power without a position sensor. The angle information is estimated mathematically from the information of the output from the generator without position sensors. This sensorless system aims to reduce the operating costs of wind power generation. Specifically, this paper uses an internal electromotive force (EMF) estimation of a generator and a phase locked loop (PLL) system. The angle information is estimated by generating a sine wave synchronized with the sine wave of the internal electromotive force that has the angle information using the PLL system. The internal electromotive force is calculated by focusing on the internal structure of the generator. We will do simulations with the software and experiments to see if this study can be carried out in practice. As a result of simulations and experiments, we were able to estimate the angle information. It was also confirmed that the information was used to control the generator at variable speed and at load change. From the experimental results, it was confirmed that good results could be obtained without using the rotation angle information. The proposed control method can be applied not only to wind power generation but also to various power generation using a position sensor-less.