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This paper models the the reserve capacity procurement problem in Denmark to account for the sequential clearing of the reserve availability market and the energy market, and the forecast error of system wind power and demand. The problem is modeled as a stochastic mixed-integer bilevel linearing programming problem. A real case of Western Denmark is studied. In the case analyzed, the EENS induced...
The intermittent wind power will impact system operation cost, and voltage profile as well. Voltage profile can be enhanced by implementing energy storage system. Thus the optimal operation of storage devices under wind energy system is of great interest. In this paper, the uncertainty of wind power is tackled by scenario-based approach, and then the optimization problem becomes deterministic under...
In this work, we provide a new short-term reliability index that accounts for practical grid properties. The proposed index addresses the system frequency reliability and controllability of the grid and its deviation over a short time period. In the formulation, demand, renewable source, battery and generators are incorporated in stochastic manner. Using the equilibrium of demand and supply, and the...
In this paper we propose a method for dispatching a fleet of wind doubly-fed induction generators (DFIGs) in a fair fashion according to a prespecified total power reference. In our context fair means that wind generators (WGs) are required to reach the same utilization levels after dispatched. We pose the problem as a constrained consensus problem on the utilization levels among the rotor-side converters...
Two major sources of rapid frequency response (RFR) to counter the reducing system inertia problem of the Great Britain (GB) system are “synthetic inertia” from wind turbines and fast demand response (FDR). In this paper, we consider a future low inertia scenario to show the effectiveness of RFR provision from the large offshore wind farms (OWFs) planned in the North Sea (concentrated response) against...
This paper presents a multi-objective optimization model based on DC power flow to maximize the active power steady-state security region whilst minimizing the total generation cost. The stochastic and fluctuant nature of wind power is incorporated into the model as well. Regarding the cost of wind power, the concepts involving opportunity costs of wind power shortage and surplus are introduced in...
This paper presents a closed-loop model in which commercial building aggregators (CBAs) minimize their operating costs in a wholesale electricity market, considering wind power uncertainties that are modeled as contingencies using a set of forecast error scenarios. Specifically, the CBAs determine the optimal energy consumption and reserve deployment of variable speed heat pumps (VSHPs) and plug-in...
This paper studies the impact of wind generation on generator rotor angle and inter-area oscillation stability. A comparative simulation study is conducted based on a U.S. Eastern Interconnection (EI) planning model for year 2030. The wind penetration level is 17% of the total generation. Generator critical clearing time (CCT) and inter-area oscillation damping ratio are evaluated. It is observed...
Increasing wind capacity integration results in displacement of active power from conventional generators and a reduction in reactive power sources available. As such voltage stability may become a concern in certain periods for power system operation particularly in weaker areas of the network. Thus, it is of importance to consider the AC constraints for optimal wind generation planning (long term)...
Cost reduction of wind power motivates the development of advanced control algorithms to enhance both efficiency and reliability of wind turbines. Achieving this goal can be done through maximizing wind energy capture while mitigating turbine fatigue loads. In this paper, an economic model predictive control framework is presented to achieve the aforementioned goal. A convex formulation of the optimal...
This paper summarizes current research and applications of wind turbine individual pitch control, reviews the basic concepts and working principles of individual pitch control methods, analyses the individual pitch control strategies for reducing the load, and mitigating grid voltage fluctuations, finally, the possible development prospects of wind turbine individual pitch control are discussed.
At present, haze has been raging over main cities in China. As a clean, contaminant free and regenerative energy, wind power has received wide acknowledgement and rapid development. Wind power generation has been developing with a tendency for big capacity, variable rotation speed, direct driving and intelligent control. On the basis of control target for wind power generation system, this document...
Wind power does not pollute and is recyclable. The speed of the blades of a wind turbine speeds considerably affect the measured output power of the turbine. The speed of the tip of the blade must be set to maximize power output. The speed of the blade also significantly affects energy losses and the power coefficients. The former should be minimized and the latter maximized. Various loads on a turbine...
Nowadays, with the introduction of different types of variable renewable energy sources, generators and other actors in the electricity market are faced with a new layer of complexity they have to adapt to. This upsets the electrical consumption profile power generation production has mostly followed and the established merit order, which was assumed on the basis that power generators bid their short...
The most significant problem is to balance between generation and consumption in power systems ranging from small to large scales. This may be done by daily load scheduling in small-scale systems using metaheuristic optimization techniques such as the GA, the PSO and the SA etc. In the case of an off-grid low power wind-photovoltaic hybrid system, it is expected to power the loads without shedding...
Wind power generation is increasingly gaining popularity around the world and in the Philippines, with its economic and environmental benefits. However, its intermittent nature poses a problem on power system adequacy, the effects of which must be quantified for reliable system operation and proper expansion planning. The Effective Load Carry Capability (ELCC) is one such metric that can quantify...
This paper solves an optimization problem to minimize the emission due to carbon oxides, nitrogen oxides and sulfur oxides with cost as a constraint for a wind-solar-thermal power system. Wind and solar energy can reach significant penetration in modern power system and they will introduce additional uncertainties. Market price is mainly influenced by the generating fuel cost, as the wind and solar...
The paper main issue is the evaluation of the influence of the air density value on the electricity production capability of a wind generator. Two different density air mathematical models, where the density has not a constant value, are here taken into account and compared in terms of reliability, accuracy and computational burden. Evaluations are carried out thanks to a horizontal axis wind generator...
Air quality control is a monitoring task of high priority in the scope of Smart City and Smart Home applications. In fact, a number of sensors are required to successfully detect the leaks of various gases and their different concentrations. Using wireless sensor platform for these purpose it's necessary to think a lot about appropriate power sources and power management. In this work, we present...
A two-stage stochastic optimization problem is proposed in order to model a day-ahead market in which energy, as well as active and reactive power reserves are jointly scheduled, in the presence of significant uncertain wind power production. In addition, a second order conic programming based AC power flow formulation is used, in order to take into account the active and reactive power losses while...
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