Stabilizing Integrated Power Systems with Constant-Power Loads Based on DC Bus Voltage Monitoring

Tightly regulated fast electronic loads are known to behave like constant-power loads (CPLs) and exhibit negative incremental impedance. CPLs can be found in many applications such as power systems of aircraft, ships, vehicles, etc. While each CPL has its own controller, the stability of the entire integrated power system might not be guaranteed due to the CPL's destabilizing effect. In this paper, an adaptive method is proposed to stabilize the integrated power system by monitoring the DC bus voltage and enabling an active damping circuit depending on the situation. The performance of the proposed methodology is verified using a simplified model of a typical integrated power system consisting of two sources and CPLs under different loading conditions.