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.

Bidirectional metering and control of electric energy between the power grid and vehicle power systems

Abstract: A metering device that allows the two-way exchange of electrical energy between the power grid and electric vehicles by giving customers the option to upload electrical energy from their vehicle's electrical power system to the power grid or to another vehicle, or the option to download electrical energy from the power grid or another vehicle, to charge their vehicle's electric storage system, depending on the current market price of electricity. This allows users to both buy and sell electricity as a commodity to offset their fuel costs and to generate income. The metering device and the associated server may maintain a database of the user's preferences and identification. The metering device may allow customers to upload and sell electricity from their vehicles during peak, high cost, energy consumption periods, download and buy electricity to their vehicles during low energy, low cost, consumption periods, or algorithmically engage in bi-directional transfer depending on the user's preferences and other variables (see [0043]) in order to maximize the customer's monetary returns and minimize the customer's monetary expenses.

The costs of electricity systems with a high share of uctutating renewables - a stochastic investment and dispatch optimization model for Europe I

Abstract: Renewable energies are meant to produce a large share of the future electricity demand. However, the availability of wind and solar power depends on local weather conditions and therefore weather characteristics must be considered when optimizing the future electricity mix. In this article we analyze the impact of the stochastic availability of wind and solar energy on the cost-minimal power plant mix and the related total system costs. To determine optimal conventional, renewable and storage capacities for dierent shares of renewables, we apply a stochastic investment and dispatch optimization model to the European electricity market. The model considers stochastic feed-in structures and full load hours of wind and solar technologies and dierent correlations between regions and technologies. Key ndings include the overestimation of uctuating renewables and underestimation of total system costs compared to deterministic investment and dispatch models. Furthermore, solar technologies are - relative to wind turbines - underestimated when neglecting negative correlations between wind speeds and solar radiation.

Turbine Stability-Constrained Available Wind Power of Variable Speed Wind Turbines for Active Power Control

Abstract: The active power control (APC) of variable-speed wind turbines (VSWT) is increasingly required to support the power system operation and control. Besides control strategies, the power reference also exerts a significant influence upon APC performance. Due to the VSWT instability, the optimistic reference which is usually determined according to the conventional available wind power (AWP) based on maximum power point, cannot be sustainably maintained over the dispatch period. This may results in frequent interruption of power reference tracking. On the other hand, the conservative reference will easily lead to excessive pitch regulation. In this letter, the turbine stability-constrained available wind power is defined and analyzed to sustain the power generation of scheduled wind turbines at a maximum level. Simulation results show that the VSWT dispatched according to the proposed AWP can maintain stable power generation with less pitch action and therefore better support secure and economic power system operations.

A power supply and battery charging system

Abstract: A novel power charger apparatus (300) is provided for supplying electrical power to an electrical device (200) for operation or to a battery (402) for charging, or both. The charger apparatus (300) comprises a primary power supply (302) for supplying power from an external power source to the power charger (300), a power converter (306) coupled to the primary power supply (302) for converting the power received by the primary power supply (302) from the external power source into a form usable by the power charger (300), and a power controller (308) coupled to the power converter (306) for controlling the power applied to the device (200) or the battery (402), or both, whereby, regardless of the rate of charge of the battery (402), a constant current is maintained for charging the battery (402) while the voltage across the device (200) and battery (402), is allowed to vary. To observe the rate of charge of the battery (402), the power charger (300) also includes a charge rate sensor (404) connected to the battery (402) and coupled to the power controller (308) to measure the voltage across the battery (402).

DIMENSION - A Dispatch and Investment Model for European Electricity Markets

Abstract: A linear energy system model is presented which optimises the future development of electricity generation capacities and their dispatch in Europe. Besides conventional power plants, combined heat and power plants and power storages, the model considers technologies that support the future high feed in of renewable energies. These technologies include demand side management processes and virtual power storages consisting of electric vehicles.