Research On Centralized Control Of Renewable Energy Generators

As the development of the renewable energy technology,the new energy generators become an important part of grid sources.In the future smart grid,the high penetration of new energy integration has been considered as an important feature.As the intermittent and randomness of renewable energy sources like wind generators,new energy generators are considered having passive effect on the stability of power grid.This unfriendly feature of new energy generators limits the introduction of high penetration of new energy to the power grid.When the micro grid is run on islanded mode,the high penetration new energy units are considered as the most important sources in system.So the stability of micro grid depends on the characters of new energy units because of the lack of synchronous units.To improve the stability of micro grid with high-density new energy,a sensible means is to make the new energy units have the characters like synchronous generators.In this paper,the main work can be concluded as follows:1?To solve the poor regulating ability of double fed induction generator(DFIG)in micro grid,a synchronized control method of DFIG is established which makes the DFIG to provide frequency and voltage support to microgrid.The proposed methods doesn't need external frequency inputs and can provide a reliable frequency support to micro grid.Moreover,the proposed stratagy are friendly to the coopertation with other kinds of new energy generators in micro grid.In the end,some time domain simulations are provided to prove the validity of the proposed strategy.2?A typical and simple micro grid is established to study the effect of the proposed synchronized control method on micro grid small signal stability.Multiple operating conditions are considered in the small signal stability analysis of the above micro grid object.