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This paper presents a mathematical model for the energy bidding problem of a virtual power plant (VPP) that participates in the regular electricity market and intraday demand response exchange (DRX) market considering different system uncertainties due to the intermittent renewable energy sources, retail customers' demand and electricity prices. By participating in the DRX market, the VPP can purchase...
In this paper, linear active disturbance rejection control (LADRC) is investigated for the load frequency control (LFC) systems with wind turbine. The wind power is considered as a stochastic load to the power grid. To compensate the stochastic disturbance with LADRC, we adopt a two-stage design method. First an LQG controller is designed to handle the stochastic nature of the load, then the intrinsic...
In this digest, a pseudo repeat pattern approach is used to size a Pseudo Direct Drive (PDD) for wind power applications. Finite element analysis and optimization techniques are applied to improve the preliminary design of PDD.
In this paper, we present a robust control of a variable-speed wind turbine with fixed pitch angle and strategy MPPT control associated on a Permanent Magnet Synchronous Generator (PMSG). This paper first proposes the PITCH angle fixed and control strategy used Maximum Power Point Tracking (MPPT) below the rated speed, which corresponds to low and high wind speed, and the maximum energy can be captured...
We propose a novel real-time pricing method for load frequency control in the grid when there is a lot of wind power. We adjust the electricity price for the owners of heat pump water heaters in addition to controlling batteries and thermal power plants at the same time. In our method, the uncertainty due to indirectly controlling electricity consumption through price presentation is compensated by...
This paper presents three configurations of direct- drive stator permanent magnet generators (SPMGs) as potential candidates for electric power generation. The design principles are discussed with details, while the proposed configurations are analysed by using the finite element method (FEM). In particular, the no-load electromotive forces (EMFs), the steady torques, the cogging torques, the flux...
This paper presents a probabilistic interval optimization (PIO) model for evaluating the problem of optimal power flow considering wind power integrated (OPFWP). In PIO model, the wind power is deemed as a probability interval variable to assess its profit and risk simultaneously. To be precise, the profit is manifested by the net decrease of generation cost between the same power system with and...
Frequency control in interconnected electrical power systems is nowadays realized using the networks' conventional thermal power plants. With the ongoing changes in power systems worldwide the share of these conventional power plants is decreasing while renewable resources such as wind power and photovoltaics are increasing their share continuously. Up to now a contribution of renewable sources to...
Wind power plant installations continue to increase worldwide because it is a kind of renewable and harmful emissions-free energy source. The increased capacity of wind power needs the new strict requirements related to the grid connections of wind generators. The requirements defined in the grid codes can be states as reactive power control, fault ride-through (FRT) capability of the wind turbines,...
This paper proposes a new method for evaluating Effective Load Carrying Capability(ELCC) and Capacity Credit(C.C.) of power system including Wind Turbine Generator(WTG) combined with Battery Energy Storage System(BESS). WTG can only generate electricity power when the fuel(wind) is available. Because of fluctuation of wind speed, WTG generates intermittent power. In view point of reliability of power...
With the increasing penetration of renewable energy, the uncertainty of the natural resources such as wind and solar power will affect the reliable operating of an autonomous microgrid. Based on the universal generating function (UGF) method, this paper introduced a multi-state probability model used for adequacy assessment of an autonomous microgrid and also proposed a calculation methodology of...
The paper uses daily historical data on electricity prices in the Latvian segment of Nord Pool power market in combination with wind speed measurements conducted in the north-western part of the country in order to perform revenue forecast for a wind power generator park and access the economic feasibility of such projects in Latvia. The forecast of revenues is based on two stochastic differential...
The paper presents the assessment of power production efficiency of five wind turbine generator types in low-wind conditions typical for Latvia. The analysis considers wind turbines manufactured by the leading European producers — Nordex, Vestas, Enercon and Siemens. The study is based on 10-min measurements of wind speed from two on-shore sites in the north and north-west of Latvia using LOGGER 9200...
This paper use differential evolution to do a comparison between two wind turbine cost models used in solving the economic dispatch problem. The models of interest are: The probabilistic model and the negative load model. These models will be used to solve the economic dispatch problem with and without the valve point effect considering different constrains such as generators capacity, ramp rate limit,...
This paper proposes biogeography based optimization (BBO) algorithm and genetic algorithm (GA) to solve the unit commitment problem incorporating the wind energy (UCIW) uncertainty. Unit commitment (UC) problem is mainly finding the minimum cost schedule to a set of generators by turning each one either on or off over a given time horizon to meet the demand load and satisfy different operational constraints...
In this work, we provide a completely new approach for a short-term power system reliability that can be utilized for system operation planning. The proposed index incorporates the system frequency as a reliability of the grid and its deviation over a short time period. Although frequency performance is often employed as a quality metric for the past system operation, our model can address the future...
This paper proposes a future economic dispatch problem for smart grid network (SGED) at peak time using demand side management (DSM) methods. The aim is to model the SGED problem at peak hours and solve it by finding an economic and reliable method of allocating the load on available generation units and choose the least expensive area or consumers to apply the DSM measures while satisfying the problem...
Wind energy use has shown a remarkable increase in last years. In order to achieve the highest efficiency with the best characteristics in wind turbines, it is necessary to analyze relevant factors in wind energy conversion. In this review a state of the art is presented focused on modeling, constitutive elements, structure and control of wind generation systems and the increasing use of wind energy...
Wind turbine generator module is the widely used system. Small wind generated powers are cascaded and connected to the grid with a constant AC supply. Wind turbine which gets subjected to various speeds of wind cannot supply a constant DC voltage. A traditional method to avoid this problem is to control either of active or reactive power to control this voltage. This paper concentrates on the control...
The Power distribution system reliability is the Evaluation of halt probability of customers power supply over a given distribution network on power system. The Distributed Generators are like wind renewable energy systems and Modern Electric Vehicles (MEV) taken into the same Distribution System and evaluate the halt of the power supply to the customers. To make reliable power supply, estimating...
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