ABSTRACT
Abstract Microgrids have been widely applied to improve the energy quality parameters of a distribution system locally, in addition to ensuring the operation of the system in an isolated manner. The Model Predictive Control (MPC) is a great solution to guarantee the operation of the system considering forecasting models and also physical restrictions of the system, which ensure the optimal operation of the Microgrid. However, the construction of a control scheme following the objectives established in order to meet the connected and isolated operation of a Microgrid is still a challenge. This paper proposes the development of an MPC control scheme that assures optimal system operation in connected and islanded mode, improving power quality indexes, ensuring network requirements, and extending battery life cycle. The proposed control operation in the connected mode can attend to the needs of the Microgrid, reducing the impacts of peak demand and the intermittent variations in renewable generation, where a linear objective function is developed for this purpose. In the islanded mode, grid requirements are guaranteed through load shedding, considering improvements in continuity indicators. Forecasting models are implemented considering the MPC approach and a detailed network model is developed. Simulation results highlight the effectiveness of the proposed control strategy.
Subject(s)
Quality Control , Electric Wiring/standards , Batteries , Renewable EnergyABSTRACT
ABSTRACT Concerns about the environment and a growing demand for electricity have led to the intensive search for renewable energy sources. Photovoltaic solar energy, in the form of distributed generation, has shown a very high growth rate to an extent that in some regions it will be adopted on a large scale, thus being responsible for the supply of a significant portion of the load of this region. Some factors have favored the adoption of distributed generation: the drop in the price of solar panels and inverters, as well as its easy installation and maintenance. However, the large-scale adoption of solar distributed generation brings new challenges to the power distribution system. Network voltage control is an example. In conventional systems, voltage control is a properly addressed problem, but in networks with the presence of distributed generation, where at certain times of the day reverse energy flows can be observed, more detailed studies on voltage behavior are necessary concerning the power quality. This article makes an analysis of relevant studies on the effects that the insertion of photovoltaic distributed generation can cause in the voltage of the electric power distribution system under the optics of two phenomena: the fluctuation and the voltage ripple.
Subject(s)
Electric Wiring , Environment , Photovoltaic Energy , Solar Energy , Renewable EnergyABSTRACT
With more and more equipments installed,the quality of power in hospital becomes worse and worse,which seriously threatens the safety of equipments.To assure medical devices running stably and improve the quality of power supply,we adopted the method of brunch power supply and power net purifying instruments in improving the condition of equipments switched on power and monitoring power quality,so that the supply quality in hospital was improved,as well as equipments trouble rate was decreased.
ABSTRACT
Objective To improve hospital power quality and guarantee the stability of medical equipment. Methods Leg of circuit is taken for power supply. Refining plant is equipped for electric barbed wire. Conditions are improved for equipment access. Power quality monitoring is strengthened. Results Power quality is effectively improved while the failure rate decreases obviously. Conclusion It is essential to improve power quality for high medical equipment quality.