Topic
Power optimizer
About: Power optimizer is a research topic. Over the lifetime, 10525 publications have been published within this topic receiving 199245 citations.
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TL;DR: In this paper, a probabilistic model for load and wind power uncertainty is proposed to simulate the status of units that are directly affected by wind power generation uncertainties, and a solution method for generation scheduling of power system is developed to make decision on fixed state of units operation in different scenarios which can be employed efficiently in unit scheduling.
113 citations
TL;DR: In this article, a cost-effective solution to realize delta power control (DPC) for grid-connected PV systems is presented, where the multistring PV inverter configuration is adopted.
Abstract: With a still increasing penetration level of grid-connected photovoltaic (PV) systems, more advanced active power control functionalities have been introduced in certain grid regulations. A delta power constraint, where a portion of the active power from the PV panels is reserved during operation, is required for grid support (e.g., during frequency deviation). In this paper, a cost-effective solution to realize delta power control (DPC) for grid-connected PV systems is presented, where the multistring PV inverter configuration is adopted. This control strategy is a combination of maximum power point tracking (MPPT) and constant power generation (CPG) modes. In this control scheme, one PV string operating in the MPPT mode estimates the available power, whereas the other PV strings regulate the total PV power by the CPG control strategy in such a way that the delta power constraint for the entire PV system is achieved. Simulations and experiments have been performed on a 3-kW single-phase grid-connected PV system. The results have confirmed the effectiveness of the proposed DPC strategy, where the power reserve according to the delta power constraint is achieved under several operating conditions.
113 citations
TL;DR: In this paper, the authors focus their attention on the system as a whole rather than on individual components, regardless of whether or not the system includes wind generation, and make proper use of wind forecasting and integrate it into our control rooms and our systems.
Abstract: To run the power system most efficiently and effectively, we must focus our attention on the system as a whole rather than on individual components - and this is true regardless of whether or not the system includes wind generation. As larger amounts of wind energy are added to our power systems, we must certainly be aware of the impacts of its variability on the system, but we must also keep in mind that our power systems are already designed to deal with substantial amounts of uncertainty and variability. By making proper use of wind forecasting and integrating it into our control rooms and our systems, we can facilitate the cost-effective use of wind energy as a mainstream component of the energy system.
113 citations
12 Jun 2005
TL;DR: In this paper, a variable speed wind turbine with a step-up dc-dc converter is used to track the maximum power output of the turbine by calculating the speed command that corresponds to the maximum output power.
Abstract: This paper discusses a new and simple control method for maximum power tracking in a variable speed wind turbine by using a step-up dc-dc converter. The output voltage of permanent magnet generator is connected to a fixed dc-link through a three-phase rectifier and the dc-dc converter. A maximum power-tracking algorithm calculates the speed command that corresponds to maximum power output of the turbine. The dc-dc converter uses this speed command to control the output power of the permanent magnet generator, such that the speed of generator tracks the command speed. A current regulated PWM voltage source inverter maintains the output voltage of dc-dc converter at a fixed value by balancing the input and output power to the dc-link. In addition, the inverter can improve power factor and inject a current with very low harmonic distortion into the utility grid. The generating system has potentials of high efficiency, good flexibility, and low cost.
113 citations
TL;DR: In this paper, the authors present a simulation tool that models wind power and its unpredictability properly, and allows determining the effects wind power has on the cost of electricity generation and on CO 2 emissions.
112 citations