Research On The Electrical Control System Of Mega-Watt Scale Stall-regulated Wind Turbine Generators

The thesis is a part of the project of developing an electrical control system (ECS) for mega-watt scale stall-regulated grid-connected wind turbine generator(WTG), which is a key 863 program in the Tenth Five Year Plan.At first the thesis introduces the relevant theory of the control system of wind turbine unit, then the framework of ECS and control strategy of MW stall-regulated WTG, as well as the detailed description of function of ECS are put forward. Afterward the general design of hardware and software of ECS is presented.Electrical parameter gathering is an indispensable part of ECS. In the thesis, the technology of serial asynchronous data communication is applied to the electrical parameter gathering system and a satisfactory result is obtained.Soft cut-in unit is one of the key technologies of the ECS of MW scale stall-regulated WTG. The analysis and design of the main circuit of soft cut-in unit are given first. Then the complete Simulink simulation model of soft cut-in system is established. What is more, an effective control strategy of soft cut-in unit that the cut-in rotate speed of WTG and SCR phase-shifting rule should be adjusted in accordance with the rotate acceleration of rotor is put forward. On the basis that the simulation model is validated, the simulation and analysis of direct cut-in and soft cut-in process of WTG are carried out, which aims at supplying necessary referential material for the R&D of soft cut-in unit. At the same time, some corresponding conclusions are reached. At last the hardware and software design scheme of SCR phase-shifting triggering control circuit of soft cut-in unit as well as its anti-jamming measures is discussed. In addition, the description of some important software models is paid to much attention.