Stand-alone power system

About: Stand-alone power system is a research topic. Over the lifetime, 8650 publications have been published within this topic receiving 192397 citations. The topic is also known as: Stand-alone photovoltaic power system.

Commercial successes in power storage

Abstract: Large capacity electricity storage systems are in daily use around the world, helping to stabilize the electricity delivery infrastructure and minimize the cost of meeting peak-load requirements. These systems typically operate on a diurnal basis: charging with inexpensive utility energy at night and discharging during periods of peak load demand. Notable successes in electric power storage include medium voltage power quality-UPS (uninterruptible power supply) systems, delivering up to 16 MW, used to safeguard entire industrial facilities and recently commissioned Golden Valley Electric Association battery energy storage system (GVEA BESS), the most power battery system, discharging up to 46 MW and with a specified run time of 15 min. The common factor in these successes is that the storage devices work with, rather than compete against conventional generation. This article describes the functions of these systems and examines other emerging applications in power storage, such as the stabilization of wind farm output. It also addresses other power storage technologies that are achieving commercial successes, such as flywheels and supercapacitors.

Wind power generator and control therefore

Abstract: A wind powered generator for generating electrical energy comprising a generator which has no slip rings between its field and armature, and which when mounted on a tower is controlled through suitable control mechanism to adjust the power output to a level compatible with the load and storage equipment, as well as the existing wind conditions. The armature is fixedly mounted on the support (which can turn about an upright axis) and a housing carrying permanent magnets rotates around the armature. Bearing means stably support the housing and the armature and the propeller is easily mounted on the housing. The device is made to be relatively maintenance free and capable of unattended generation of electricity over extended periods of time.

Lift truck with hybrid power source

Abstract: A lift truck power source includes a hybrid power supply including a storage battery, a capacitor bank, and optionally a fuel cell. The capacitor bank stores power produced during regeneration by either the truck traction system or the lift system and delivers current when current demand exceeds that delivered by the fuel cell. The storage battery or fuel cell acts as a main power supply to deliver current at a rate sufficient to power the lift truck. When the fuel cell is the main power supply, the storage battery stores power during times when current demand is less than that delivered by the fuel cell and delivers current at times when current demand is greater than that delivered by the fuel cell. When the storage battery is the main power supply, the fuel cell supplements the power delivered by the storage battery, and can also recharge the storage battery.

A Method to Study the Effect of Renewable Resource Variability on Power System Dynamics

Abstract: This paper proposes a set-theoretic method to assess the effect of variability associated with renewable-based electricity generation on power system dynamics, with a focus on time-scales involving electromechanical phenomena. Performance requirements define a set within which the values of certain system variables, e.g., synchronous generator speeds, system frequency, or bus voltages, must remain at all times. To address this problem, reachability analysis techniques are used; for a given time frame, if the reach set, i.e., the set that contains all possible system trajectories, is within the set defined by performance requirements, then it may be concluded that variability arising from in renewable-based electricity generation does not have a significant impact on system dynamics. The proposed method is illustrated through several case studies, including the 39-bus New England system model.