System stability and its influencing factors analysis of the isolated wind-solar-diesel- battery hybrid micro-grid

An isolated micro-grid system of wind-solar-diesel-battery hybrid power generation is suitable for remote areas and islands. Possessing qualities generally attributed to the isolated micro-grid are inadequate anti-disturbance ability and weak stability. Power system stability analysis is needed for providing some suggestions and advices to planning and design. This paper analyses system stability of an island isolated micro-grid at different operation modes. Based on the results, reasonable operation modes and system reserve demand are proposed for long-term, efficient, and stable operation of the isolated micro-grid. Sensitivity analysis has made to find critical factors which mostly affecting system ability, such as transformer selection, low voltage ride-through capability and so on.