Stability enhancement in DC distribution systems with constant power controlled converters

Abstract

DC distribution is becoming more and more a suitable technical solution for medium voltage (MV) distribution systems especially in presence of storage devices and renewable energy sources. Among the different challenging issues concerning the new topological configurations of DC systems, stability represents a topic of paramount importance. The paper presents, by means of numerical continuation method, the stability analysis of two DC distribution systems which supply constant power loads (CPLs) connected to the AC grid with an interface converter. CPLs behavior may provoke voltage instability of the DC systems. The paper presents the approach used to maximize, by means of a feedback action on the interface converter, the stable region of operation of the DC distribution systems

More Electric Vehicles DC power systems: A large signal stability analysis in presence of CPLs fed by floating supply voltage

“…Onboard elec tightly controlled, exhibit the so-called Con (CPL) behavior, whose destabilizing extensively studied and evaluated in litera instability have been assessed, and different (sliding-mode controls and feedback lineari have been presented, along with design criter be implemented in the onboard CPL conve behavior is investigated by authors accord theory in order to exploit generating systems to solve CPL instability. Authors have also of DC systems in presence of CPLs continuation methods [3]. Both Lyapuno continuation theories will be used in the fol this work.…”

“…In [1], CPL control techniques ization techniques) ria of controllers to erters. In [2], CPL ding to Lyapunov s converters control o analyzed stability using numerical ov and numerical llowing sections of e general: as CPL 1], shipboard [2], distribution [3], sea and unders aspect not so assessed in literat fluctuation of the operating po the DC bus voltage) feeding a situation in some recent proje where a large battery storage is bus as in Figure 1.…”

On design of a robust controller to mitigate CPL effect — A DC micro-grid application

“…Use of state feedback control to compensate CPL effect and analysing ROA and Large-signal stability is reported in [19]- [20], while in [21] virtual capacitance emulated through control loops is used to stabilize DC Distributed Power System (DPS) under CPL. Authors in [22], used numerical continuation method for stabilizing DC DPS under CPL effect.…”

Technical and economical evaluation of storage systems in naval applications

“…In naval applications, civil and military vessel, the potentials benefits arising from the on board introduction of the storage technologies are: support in stabilizing the distribution grid in particular in presence of electronic power converters controlled as constant power loads [1]; increasing of the short circuit power streaming This paper has been supported by Regional Operating Program of Friuli Venezia Giulia -FSR-POR 2007-2013 MVDC Large Ship down DC/AC converters in order to guarantee the protection selectivity (AC side); mitigation of the voltage fluctuations caused by high-power pulse electrical equipment, both in civil vessel i.e. caused by thrusters, and in military vessel caused by radar, electromagnetic railgun and Electromagnetic Aircraft Launch System "EMALS" [2] - [6].…”