Emergency voltage control with decentralized generation

Distributed generation (DG) plays an increasing role in the power system. Due to their local character they could in principle be used in emergency situations to prevent a blackout. Classically, however, DGs are uncontrollable. In this paper methods are proposed to use DG as actuator in the Hierarchical Agent-Based Voltage Instability Prevention (HABVIP) system. The control strategy in this system is to obtain a certain amount of load relief in the problem area. Three types of DG are considered: micro-CHPs, greenhouse CHPs and Wind Turbines (WT). For the micro-CHP and greenhouse CHP the output power can be controlled within limits. These limits are determined by the maximum temperature settings. For the micro-CHP a Virtual Power Plant (VPP) scheme is proposed to obtain continuous power output of a group of micro-CHPs that work under thermostatic control. For the WT the output power cannot be controlled. For that reason a method is proposed to use the predicted power generation of this turbine to anticipate for an increase or decrease. The proposed methods are verified by simulations which show that the methods work properly.