Control strategy of microgrid based on flywheel storage  and lead-acid battery

LIU Xia， JIANG Quan-yuan
（Department of Electrical Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract： As a special way of grid running，microgrid can operate in both grid-connected mode and isolated mode. Effective control strategy for distrbuted sources and the whole microgrid is the key technology of microgrid. To ensure stable and reliable operation of the microgrid，effective and smooth switch between different operating modes，a coordinated control method of using lead-acid battery as the main source and the flywheel to keep uninterrupted power supply was proposed based on modeling different kinds of distributed source. The stabile operation and good quality of power supply were guaranteed by this method. The uninterrupted power supply for load in the microgrid during switching process between the two modes was ensured，as well as the transient oscillation was dramatically reduced for transiting to the steady state swiftly. Modeling and simulation results show the efficiency and precision of the proposed method．
Key words： microgrid；PQ control；distributed generator；switching control ；single-master control