چكيده به لاتين
The utility industry around the world deal with different issues. Including many different generation types, the optimal utilization and distribution of expensive equipments, The fast growing energy demands, the energy shortage and the environmental pollutants. Recently, to overcome the mentioned issues and to remove the serious demerits of the conventional power systems, the next generation of power systems, namely smart grids, is introduced microgrids are one of the most significant parts of smart grids. Generally, there are three types of microgrids, i.e, AC,DC and hybrid microgrids. DC microgrids, as a new practical research field in electrical power engineering, are serious alternatives to substitute AC microgrids especially in residential, administrative and commercial regions. One of the most important issues in DC microgrids is the voltage control. The ohmic resistance of electrical lines can seriously disturb the voltage control of DC microgrids. Hence in many existing researches, the voltage control of DC microgrids is studied in microgrids with superconducting conductors or very small microgrids with very short electrical lines. Regarding bus voltage of DC-Micro-grids, it has always been an important index of DC-Micro-grids.
This thesis puts forward a two-way AC/DC converter voltage current double closed loop control method. It is easier to control the voltage and current by using d-q shaft transformation decoupling. Build the system model with MATLAB/simulink software and simulate in the time domain cases in the Condition of Synchronization. The results prove that the method can very good control dc bus voltage stability, ensure system power safety.
