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In this paper, a hierarchical security-constrained optimal power flow (SCOPF) model is proposed for a meshed ac/multiterminal HVDC (MTDC) system with high wind penetration. The two interacting levels in the proposed model are as follows: 1) the high level is a traditional SCOPF problem in an ac system that aims to minimize total generation and security control costs; and 2) the low level is a dynamic...
This paper investigates the double randomness matching mechanism between electric vehicle (EV) charging and wind power in a distribution network. The Markov Decision Process is employed to model the uncertainties of both EV and wind power. The optimized dispatching models and strategies for EV charging under multi-time scale are developed to achieve the objective function. The goal of this function...
This paper presents results from case studies of the future power systems in Morocco and Egypt, with a high increase in renewable generation capacity. Datasets representing 2030 scenarios have been generated and studied with a simplified grid-market model that takes into account variable renewable generation, energy storage and electricity grid constraints. Simulation results for Morocco and Egypt...
the abundance of freely available wind energy comes with downside of being stochastic and inconsistent in nature. These properties are not particularly suited for a critically balanced system like electrical transmission grid. This work is primarily focused on assessing the effect of uncertain and stochastic nature of wind power on the stresses it imposes on transmission grid. This impact is studied...
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 paper (Part II) we implement the prediction-updating approach developed in Part I to address fast changes in wind power generation when solving a complex realtime optimal power flow (RT-OPF) problem. The approach considers essential scenarios around forecasted wind power values in a moving prediction horizon (120 seconds). The individual optimal power flow problems corresponding to these scenarios...
Real-time optimal power flow (RT-OPF) under wind energy penetration is highly desired but extremely difficult to realize. This is basically due to the conflict between the fast changes in wind power generation and the slow response from the optimization computation. This paper (Part I) presents a prediction-updating approach to address this challenge. We consider essential scenarios around forecasted...
Planning of renewable resources is an essential study in active power distribution systems. In this paper, an optimal sizing of wind/solar mix is presented with the consideration of the security of the generation resources. The proposed methodology employs the negative correlation between solar and wind output power to ensure a certain level of supply security and load fulfillment. The effect of formulating...
This paper deals with optimal location of Flexible AC Transmission system (FACTS) device like Thyristor Controlled Series Capacitor (TCSC) by performing Optimal Power Flow (OPF). The OPF is performed on IEEE-14 bus system by minimizing the total system cost with an iterative procedure and the impact of wind integration on the considered system is studied in different scenarios with selection of optimal...
This paper discusses the advantage of Voltage Source Converter (VSC) based multi-terminal HVDC transmission system for integrating off-shore wind power generations with on-shore AC grid. A new hybrid protection and control scheme has been proposed which ensures robust performance during system disturbances, smooth operation and power sharing coordination between grid side converters.
Sustainable development of electricity source is currently the aim of electrical engineering and is complex because of both technological issues and the operational challenges. Regulated supply can be extended only with bulk storage facilities. A method of solution is proposed to deal with optimal power flow in a power system where the extensive use of wind and solar PV system is envisaged. Multi-criteria...
Popularity of the offshore wind farms in recent years has been increased because the wind resource in offshore is higher with uniform wind speed and availability of large sea area. Most of the offshore wind farms have MVAC (Medium voltage Alternating Current) distribution system. In this paper MVDC (Medium Voltage Direct Current) distribution system is proposed and the performance of this is compared...
This paper Proposes Probabilistic optimal power flow to analyse the variation of Locational Marginal Prices (LMPs) with penetration of wind energy. The uncertainty of wind speed and load is modelled using probability distribution functions based on their historical data. Integration of storage unit with wind is proposed to assess economic advantages. In this paper Two Point Estimation Method (2PEM)...
Todays the WECS or Wind Energy Conversion Systems are developed. WECS are considered as complex systems, including mechanical sub-systems such as the rotor and the system of secondary electrical converter, inverter, rectifier, controller, and are once. Turbines used in wind turbines are divided into two general categories: fixed rate and variable rate. Technical comparison of reactive power compensator...
The allure of integrating wind power, as a clean renewable energy source, into distribution grids is usually blurred with its undesirable impacts. These include reverse power flow, voltage rise, and disruption of the normal operation of voltage/VAr (VVAr) control devices. This paper describes a voltage control scheme that coordinates the VVAr control devices along with energy storage to mitigate integration...
Increasing penetration of wind power into the generation mix has necessitated the integration of wind farms in the daily planning and dispatching operations of independent system operators. This paper models a simple and intuitive cost function that can dispatch power among multiple wind farms in an economically equitable manner. The cost function is used in an optimal power flow problem for the IEEE...
Many wind integration studies have been performed in recent years, with evolving methodologies. Since power systems and data availability vary significantly, the results and methodologies used in these studies have varied accordingly. This paper presents the main findings from the IEA WIND Recommended Practices for Wind Integration studies. An overview of a complete wind integration study is presented...
As the share of wind energy in power system increases, consideration of these resources in power system planning, particularly in Transmission Expansion Planning (TEP) is becoming more and more important. In this paper, a Probabilistic Multi Objective Transmission Expansion Planning (PMO-TEP) is presented to find the optimal node for connecting the large-scale distant wind farm to the network from...
This paper proposes a probabilistic optimal power flow (POPF) to evaluate the power system operation with renewable energy generation. Probability density functions (PDFs) are used to stochastically model the wind speed and load. A (2m+1)-point estimation considers the system uncertainties for power flow analysis. The proposed method incorporates energy storage into the POPF model to evaluate its...
This paper proposes the phase-plane fuzzy logic control method of the interline power flow controller (IPFC) in the power system consisting of the single synchronous generator connected to the infinite bus based on the modified Heffron-Phillip's model. The proposed controller is applied to control the frequency robustly and to improve the power system stability due to the uncertainty of power produced...
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