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This paper studies the dynamics of a droop-controlled voltage source inverter connected to a stiff grid and addresses the use of the improved droop controller in order to enhance the dynamic behavior of the system. The small-signal stability of the inverter is studied in depth considering variations on its droop parameters, providing a general understanding on the functioning of such system. Finally,...
This paper proposes a nonlinear reduced-order model of a grid-connected AC Microgrid as seen from the point of common coupling (PCC) to the grid. The model is based on the dynamics of a single droop-control generator and aims to reproduce the behavior of the low-voltage grid with a minimum set of parameters. The model is first derived considering an infinite bus at the PCC, showing the fundamental...
This paper presents a modeling technique for the study of power inverter interactions when operating in parallel in a low voltage grid. A generalized model of a droop-controlled voltage source inverter is presented, which can be modified to represent traditional rotating generators as well as external conditions imposed at the point of coupling to the grid. A nonlinear model for the power flow through...
Increasing integration of distributed energy resources is severely impacting the operation of the power grid, modifying its topology and making it necessary to revise different technical issues that follow the massive implementation of these resources. One interesting point being currently discussed is the use of distributed energy resources for the provision of ancillary services such as load-following...
The increase in renewable power generation causes an overall decrease in conventional power generation from large-scale and highly predictable fossil power plants. Aside from market-based provision of active power schedules, these power plants are crucial for the provision of short-term automatic ancillary services such as frequency and voltage control. Substituting these plants for renewable generation...
Pneumatic artificial muscles feature lightweight and compact construction, in combination with high obtainable forces and an intrinsic compliance. This makes them well suited for the actuation of kinematically redundant manipulators, but due to the limited deflection of the single muscles and the highly nonlinear static and dynamic characteristics, a whole new set of challenges arises. In this contribution,...
This paper discusses the implementation of a π/4-DQPSK bandpass modulator integrated solely on a digital platform, without the use of external modulators, mixers, or RF filters. Modulation and filtering are performed digitally, hence providing high performance and noise immunity. The system is described in blocks, which are later coded in VHDL and implemented on an FPGA.
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