Research On Decoupling Control Of Active And Reactive Power Of Distributed Generation System Operating In Connection With Grid

In view that traditional resources will be exhausted in the near future, the large scale utilization of distributed generation system, namely its grid-connected operation, enjoys most attractive prospect, while the grid-connecting devices play a crucial role in the realization of the grid connection. Through the manipulation of inverter,the active and reactive current from it can be seperated from each other, then functions such as reactive power compensation and active filtering can be conveniently accomplished for the improvement of power quality on the grid while transfering the active power. In the paper, a decoupling control strategy based on the input-output linearlization is brought forward, and it effectively eliminated the interaction between active and reactive current, equiping the system with fairly good linear control characteristic. The current component on d axis and that on q axis can be seperately adjusted, and then the active power and reactive power injected in to grid from DG through inverter can be conveniently regulated. The method adopted possesses distinctive merits such as simple structure, good control performance.