Research on Control of Grid-side Converter of Doubly Fed Hydrogenerator Based on Active Disturbance Rejection

With the development of the times, great achievements have been made in hydropower construction in China. However, a large number of hydro-generator sets use conventional PI controllers to adjust the converter, which can not adjust the controlled variable quickly in real time, and it is difficult to eliminate the static error and unstable output voltage. In order to solve these problems, this paper adopts doubly-fed hydro-power generation system and improved auto-disturbance rejection control to control the grid-side converter, which can control the DC voltage well, weaken the harmonics on the grid side and stabilize the current output on the stator side. Finally, a simulation model is established and compared with the conventional PI control. The results show that the control strategy proposed in this paper can make it connect to the grid faster, maintain the DC bus voltage on the grid side effectively and has strong anti-interference ability.