In order to alleviate the growing energy contradiction and maximize use of renewable energy, microgrid is experiencing a rapid development as a new means of power system. The master inverter in microgrid should operate in grid connected mode and island mode. A seamless transferring control method was presented in this paper, two different control loops were designed for respective operation modes, and the detailed design steps and the improved control method for smooth transition were discussed. A novel phase-locked loop control method applied in microgrid is also proposed, which can ensure the seamless transferring process. Finally, a dedicated microgrid test-bed were built to evaluate the seamless transferring control method, the experimental results in various microgrid operation modes were depicted to demonstrate the correctness of theoretical analysis and the feasibility of the microgrid control strategy.
This paper put forward a kind of vehicle anti-collision warning system and put the emphasis on the research of active control. It introduced the function and composition of the system and expounded its working principle. First the safety distance model was studied based on the vehicle kinetic theory. This model contained longitudinal and lateral safety distance model. And the longitudinal safety distance model can be further divided into Safety Critical distance, Lock-in Target distance, Danger Critical distance and Limited Critical distance. Then the dangerous targets were identified and classified based on safety distance model .Finally, according to different targets, the corresponding evasion control strategy and the control flow chart were established.
Considering the coupling effect between clamping force control and speed ratio control, this paper takes the axial displacement of primary pulley as the feedback of speed ratio control which can overcome the impact of external load and disturbance of outside environment. By choosing typical working conditions, simulation was carried out and the results showed that this control method had strong capacity of robust and decoupling, good dynamic response and stability.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.