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Bus voltage stability is an essential requirement in DC shipboard microgrids. In presence of Constant Power Loads, voltage instability is strictly dependent on RLC filters. This paper evaluates two power converter solutions (Thyristor Converters, TCs, and diode rectifiers + DC-DC Converters, DCs) for interfacing AC machines and DC bus. Firstly, TCs and DCs filters are sized maintaining same targets,...
The DC onboard microgrid of a More Electric Aircraft (MEA) comprises of multiple Point Of Load (POL) converters to cater to diverse loads at different voltage levels. Lightly damped LC filters are typically used at the inputs of these POLs to reduce the noise in the system. Any tightly regulated POL acts like a Constant Power Load (CPL) and exhibits negative incremental impedance. The interaction...
This paper investigates two control approaches to stabilize MVDC microgrids under large perturbations. The control approaches compared here are a 2 Degree of Freedom (2DoF) linear control and a synergetic control for voltage stability of DC microgrids, where loads and generators are interfaced through power electronic converters. The stabilizing control of the bus voltage resides in the converters...
AC Microgrid (MG) consists of multiple inverters connected together and operating in a decentralized manner. Each inverter includes active power/frequency and reactive power/voltage droop control laws. These controllers ensure active and reactive power sharing among inverters without using communication link. This paper deals with stability analysis of the MG with converter interfaced loads operating...
Rapidly increasing penetration of renewable energy sources into conventional power distribution systems has led to the rise in power electronic converter dominated power distribution systems. However, it has been a well established that the presence of tightly regulated point-of-load (POL) converters in the power distribution system, which act as Constant Power Loads (CPLs), cause serious stability...
It is known that the interaction between poorly damped LC input filters with constant power loads leads to degradation of dynamic performance and instability of the system. This paper addresses the global stability study of an electrical system containing a DC power supply, an LC Filter and a constant power load. This latter is realized by a voltage source inverter supplying a Permanent Magnet Synchronous...
This article investigates how power electronic interfaces for loads provide reactive power in case of abnormal voltage conditions. An evaluation of voltage support is done for different values of voltage sags when the power electronic interface provides with reactive current. The stability margins of the distributed system are investigated for different types of loads and it is proved that the higher...
In this paper, thorough analysis is carried out on a microgrid system with a constant power load. Constant power loads make the system to be unstable due to their negative impedance characteristics and this is proved for the microgrid system by deriving the small signal state space model for the system and then observing the location of the system poles. Subsequently, a sensitivity analysis is carried...
Depending upon the charging technique, fleets of PHEVs integrated within the power grid behave as constant power loads (CPL) or constant impedance loads (CIL). In this paper, a small-signal stability analysis of a power system with high PHEV penetration is performed. The results indicate that when the PHEVs are charged with a constant-current technique, the grid is more prone to instability. Consequently,...
Distributed AC power systems with large percentage of constant power loads (CPL) are susceptible to potential voltage stability problems under abnormal operating conditions. The design of the control system of the CPL can greatly influence the power system stability. Regulated converters with high bandwidth control systems can act as CPLs, exhibiting a negative incremental resistance in a wide frequency...
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