Hybrid methods for transient stability assessment and preventive control for distributed generators

In the future, with the high penetration level of the distributed generation, their decoupling from network during the fault will eventually cause critical consequences. In order to avoid such situation, it is necessary to perform the transient stability analysis. The paper investigates the hybrid methods for fast transient stability assessment which are able to detect quickly the loss of stability of distributed generation. These methods are based on the transient energy function and SIME methods. Then the hybrid-based preventive control for generation redispatch will be proposed to help the distributed generators withstand disturbance in distribution network. The methods described in this paper using detail model of generator allow a very high precision in the application for the small synchronous generators installed in the distribution network.