Power optimizer

About: Power optimizer is a research topic. Over the lifetime, 10525 publications have been published within this topic receiving 199245 citations.

A review on the inclusion of wind generation in power system studies

Abstract: In this paper, an extensive review on power system studies with inclusion of wind generation has been attempted. The various basic aspects of wind generation including basics of wind power statistics, wind farm, wake-effect, and environmental effects on wind generation have also been discussed. For the practical analysis of power system with wind generation, accurate wind generation models must be developed with load flow methods that can be integrated in to the normal power system algorithm to cater the need of inclusion of uncertainty in power system. So, various wind turbine generator models and deterministic load flow methods for transmission and distribution system have also been reviewed. The intermittent and fluctuating nature of wind power injected into the grid causes variations in bus voltages and line power flows of transmission system which is going to be quite significant in the future. So, for the successful integration of wind generation in the grid, these variations need to be analyzed, estimated and quantified, which can be achieved through probabilistic load flow. The various probabilistic load flow methods along with application and extension have also been reviewed. The correlation between wind generators in a wind farm has also been discussed. For the successful operation of power system with wind, it is mandatory to have power system planning and contingency analysis with uncertainty. The different methods used in power system planning and contingency analysis have also been reviewed. For the integration of wind generation to be viable, it must be cost effective and free of technical abnormalities. A review on the technical and economic issues related to the integration has also been done. Finally, with the increase in installation of offshore wind farms, HVDC application with wind farms has also increased. So, HVDC techniques with wind generation have also been reviewed in detail.

Nonlinear control of dc-dc bidirectional converters in stand-alone dc Microgrids

Abstract: The direct current (dc) microgrids are an option to new demands for power quality and integration of renewable resources in developing regions, where the main network is unavailable. However, the dc architecture is based on multi-stage power converters where point-of-load converters can be seen by the feeder converter as constant power loads (CPLs). This nonlinear characteristic and the frequent change of the availability of energy sources and loads makes the linear control inadequate. This work addresses the nonlinear stability analysis of a stand-alone dc network. In addition, it is proposed a sliding mode controller based on a washout filter that is responsible for controlling the balance of power (load demand and generation) through a dc-dc bidirectional converter (DBC). This converter is connected to a storage device that plays the role of maintaining a constant dc bus voltage. Simulation results allow us to validate the proposed controller under variations in the availability of energy sources and loads.

Wind energy conversion system- wind turbine modeling

Abstract: In this paper, a functional structure of a wind energy conversion system is introduced, before making a comparison between the two typical wind turbine operating schemes in operation, namely constant-speed wind turbine and variable-speed wind turbine. In addition, the modeling and dynamic behavior of a variable speed wind turbine with pitch control capability is explained in detail and the turbine performance curves are simulated in the MATLAB/Simulink.

Benchmarking of constant power generation strategies for single-phase grid-connected Photovoltaic systems

Abstract: With a still increase of grid-connected Photovoltaic (PV) systems, challenges have been imposed on the grid due to the continuous injection of a large amount of fluctuating PV power, like overloading the grid infrastructure (e.g., transformers) during peak power production periods. Hence, advanced active power control methods are required. As a cost-effective solution to avoid overloading, a Constant Power Generation (CPG) control scheme by limiting the feed-in power has been introduced into the currently active grid regulations. In order to achieve a CPG operation, this paper proposes three CPG strategies based on: 1) a power control (P-CPG), 2) a current limit method (I-CPG) and 3) the Perturb and Observe algorithm (P&O-CPG). However, the operational mode changes (e.g., from the maximum power point tracking to a CPG operation) will affect the entire system performance. Thus, a benchmarking of the proposed CPG strategies is also conducted on a 3-kW single-phase grid-connected PV system. Comparisons reveal that either the P-CPG or I-CPG strategies can achieve fast dynamics and satisfactory steady-state performance. In contrast, the P&OCPG algorithm is the most suitable solution in terms of high robustness, but it presents poor dynamic performance.

Minimizing Wind Power Spillage Using an OPF With FACTS Devices

Abstract: This paper proposes an optimal power flow (OPF) model with flexible AC transmission system (FACTS) devices to minimize wind power spillage. The uncertain wind power production is modeled through a ...