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The photovoltaic (PV) source simulators are widely used to test solar inverters, evaluate their control algorithms and study their grid integration issues in the laboratory settings. Many commercial programmable dc power supplies can be re-programed to be PV simulators. Due to the bulky output dc capacitors, the dynamic response and the bandwidth of these PV simulators are significantly limited, which,...
Power grid scale is expanding, more generators with large capacity are used in the power system, the growth of the load current is rapidly, the realization of the major regional power grid interconnection, all of these factors will lead to the fault current level continues to rise, which may lead to serious security problems, even collapse and collapse of the system. This paper proposes a high-speed...
An autonomous integrated Loss-of-Control (LOC) Prevention and Recovery (iLOCPR) system for UAVs is proposed with four operation modes: a nominal mode designed for 6 degree-of-freedom (DOF) trajectory tracking by trajectory linearization control; a LOC prevention mode designed by bandwidth adaptation augmentation to the baseline nominal controller for increasing the stability margin in the presence...
In this paper, an automatic flight control system (autopilot) is designed for Loss-of-Control (LOC) arrest, i.e. stopping the progression of a LOC upset and regain control authority and airborne of the aircraft. The LOC arrest philosophy is to protect healthy aerodynamic angles at all cost, even temporarily abandoning the flight mission. The LOC arrest controller is designed as an add-on to an autonomous...
Incorporating a medium-voltage dc (MVDC) integrated power system is a goal for future surface combatants and submarines. In an MVDC shipboard power system, dc/dc converters are commonly employed to supply constant power to electric loads. These constant power loads have a characteristic of negative incremental impedance, which may cause system instability during disturbances if the system is not properly...
This paper presents an improved double delta sampling (DDS) circuit and the architecture and readout sequence are introduced in detail. Meanwhile, a new method to evaluate the Fixed Pattern Noise (FPN) cancellation for readout circuit before fabricated is proposed. Thus, we can evaluate DDS or other readout circuit in another view. Compared with the conventional DDS circuit, the new architecture is...
By incorporating relay technologies into cellular systems, multi-hop relay networks (MRNs) can provide higher throughput and wider coverage, but it is impossible to guarantee quality of service (QoS) requirements for users at the cell edge and in hot spots due to severe co-channel interference (CCI) and load imbalance. This paper proposes an adaptive resource allocation scheme with a joint consideration...
This paper presents a novel bi-stable and integrated single use MEMS blowout switch based on electro-thermal theory. The switch mechanically breaks a metallic line. Switching between the two stable states is accomplished by a DC signal through an integrated heating resistance underneath the electrical lines to be melted. Some key features are that switches are bi-stable, integratable and IC compatible...
Incorporating a medium-voltage DC (MVDC) integrated power system is a goal for future surface combatants and submarines. In a MVDC shipboard power system, DC/DC converters are commonly employed to supply constant power to electric loads. These constant-power loads have a characteristic of negative incremental impedance, which may cause system instability during disturbances if the system is not properly...
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