Category: Grid generation ppt

English PDF. Sources of Operational Flexibility. Methods for Procuring Power System Flexibility. The Role of Storage and Demand Response. Grid Integration Studies: Data Requirements. Forecasting Wind and Solar Generation. To foster sustainable, low-emission development, many countries are establishing ambitious renewable energy targets for their electricity supply. Because solar and wind tend to be more variable and uncertain than conventional sources, meeting these targets will involve changes to power system planning and operations.

Grid integration is the practice of developing efficient ways to deliver variable renewable energy RE to the grid. Robust integration methods maximize the cost-effectiveness of incorporating variable RE into the power system while maintaining or increasing system stability and reliability. Power system planners can secure and sustain investment in new variable RE generation by aligning targets and incentives with grid integration considerations.

Long-term, aspirational renewable energy targets establish a vision that can drive innovation in the policies and system operations that support clean energy. As planners consider scaling up variable RE generation, the inherent variability of wind and solar resources complicates evaluations of whether a system with significant variable RE has adequate supply to meet long-term electricity demand. A variety of approaches exist for estimating the capacity value of variable RE, as well as techniques that enable utilities and power system operators to use wind and solar to reliably meet electricity demand.

Integrating distributed photovoltaic PV solar power results in unique benefits and challenges compared to the integration of utility-scale wind and solar power. Significant localized growth in PV can raise concerns such as voltage violations and reverse power flow in low-voltage distribution systems. However, various studies have shown that positive impacts e. Updating interconnection standards, procedures, and distribution planning methodologies to better reflect the characteristics of distributed PV can help realize these benefits and delay or even prevent the need for grid reinforcement.

Scaling up variable RE generation requires grid expansion and upgrades so that power systems can access high-quality solar and wind resources, which are often remote from existing transmission networks.

A well-crafted combination of policies, rules, and procedures designed, for example, through an " RE Zones " approach encourages investment in large-scale transmission expansion. These measures not only improve the utilization of variable RE, but also potentially defer the need for network refurbishment. Accessing sources of operational flexibility becomes increasingly important in systems with significant grid-connected solar and wind energy.

System operating procedures and market practices—especially the implementation of forecastingfaster scheduling, ancillary services, and grid codes and power purchase agreements —are often among the least-cost options for unlocking significant flexibility without significant investments in new physical infrastructure.

Other sources of flexibility include flexible conventional generation and transmission networks. Additionally, demand response and storage are emerging as tools for increasing flexibility at very high penetrations of variable RE. Options for procuring flexibility vary based on the regulatory context. For vertically integrated utilities, contractual or policy mechanisms provide the primary basis for encouraging the uptake of flexibility measures.

In contrast, partially- or wholly-restructured power markets motivate flexibility through incentives and market design mechanisms, such as sub-hourly dispatch, ancillary services markets, and price-responsive demand.

In any power system, planning activities include assessing long-range demand and evaluating options for expanding capacity and transmission. With the introduction of significant variable RE generation, power systems planning increasingly focuses on evaluating options for increasing flexibility across the power system.

Grid integration studies help establish the flexibility requirements and build confidence among investors and operators that the power system can be operated reliably at increased variable RE levels. A grid integration study simulates the operation of the power system under various scenarios, identifies potential constraints to reliability, and evaluates the cost of actions to alleviate those constraints.

Robust grid integration studies are based on significant stakeholder input, along with a broad set of foundational data. Although grid integration studies usually include production cost simulations to model unit commitment and economic dispatch, determining the system-wide costs of integrating solar and wind power is much more challenging.As compared to the conventional grid, smart grid is automated, highly integrated, technology driven and modernised grid.

In coming years smart grid will have a key role in transforming the electrical networks, its topology and power system operation. Energy efficiency, electricity supply and sustainability are the foundation pillars of smart grid technology.

The reliability of electric supply has become the utmost priority of consumers in developed as well as developing countries throughout the world.

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Through smart grid implementation, monitoring, control and real time measurement of generation, transmission and distribution of electrical energy has become possible and hence reliability of electric supply is improved.

Smart grid has the potential to reduce the carbon footprints by integration of renewable energy sources, energy storage and plug-in hybrid electric vehicles with the main grid. They have higher switching frequencies which is useful characteristics for voltage magnitude conversion and frequency control.

These devices are used in converters.

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Depending upon the converter topology these converters are able to control the power flow also. Power electronics therefore plays a vital role in smart grid implementation and its development. Applications of power electronic devices in Smart Grid. Power electronic voltage regulators using TRIAC are used to regulate the voltage on the distribution feeders. The capacitor banks are used to boost the voltage of the line by generating Vars.

Power electronics based Flexible AC Transmission FACTS technologies and automation technologies are necessary for smooth integration of renewable energy sources with the main grid. Different energy sources are integrated with power electronic interfacing technologies as follows:. Figure 1: Basic structural diagram of full scale, three-level wind-power converter. The power electronic interface for PV systems has two main functions i.

In stand-alone mode, if the available power from the PV panel is more than the required power, the PV panel should supply the load power and the excess power should be used to charge the storage device.

The storage device with the controller should provide the power difference when the available power from the PV panel is smaller than the required power at the load bus. In grid connected mode also, the load draw power from the grid when PV panel system cannot produce energy.

When PV panel system produces surplus energy, it can be used to charge the battery banks or injected into the grid.Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy. See our Privacy Policy and User Agreement for details. If you wish to opt out, please close your SlideShare account. Learn more. Published on Aug 9, SlideShare Explore Search You.

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Help Preferences Sign up Log in. Featured Presentations. Power electronic interfaces. Utility with different quality levels Energy Storage. Distributed Energy Systems - Electrical power generated by small plants close to consumers Boiler can use any heat source. Relatively inexpensive per MW. Hard to scale down Electrical power generated by small plants close to consumers Citizens Power.

DALE T. Hatziargyriou Segretario: C. Schwaegerl Scopo Definizione dell impatto su struttura ed Energy Metering Measure, aggregate Globus Heartbeat Monitor and MicroGrids What level of false positives are acceptable?

What latencies for failure detection are useful?

grid generation ppt

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Products Sold on our sister site CrystalGraphics. Title: Introduction to Grid-Connected Photovoltaic.

Power Electronics in Smart Grid

CEC Equipment Lists. Tags: cec connected grid introduction photovoltaic. Latest Highest Rated. Whos Involved There are more people involved in all this than you think! Terminology Process vs. Equipment 3 Why PV? It is definitely Part of THE energy answer, but it may not work appropriately for all situations.

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Just as each person is different, so are our energy needs. Oh, and the Weather! Its Free Energy Hype. It isnt right if it doesnt work! If the Government just put more money into it it would be fixed in X years Double-edged hype. They need Justification to continue. Responsible Siting, System Design, Installations can remove a big part of the Double Edge by providing that justification.

grid generation ppt

Things may not be what they seem and not everybody speaks the same language!!!! Equipment vs. Electrical generation located at the site of consumption.In an electric power systemautomatic generation control AGC is a system for adjusting the power output of multiple generators at different power plantsin response to changes in the load. Since a power grid requires that generation and load closely balance moment by moment, frequent adjustments to the output of generators are necessary.

The balance can be judged by measuring the system frequency ; if it is increasing, more power is being generated than used, which causes all the machines in the system to accelerate.

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If the system frequency is decreasing, more load is on the system than the instantaneous generation can provide, which causes all generators to slow down. Before the use of automatic generation control, one generating unit in a system would be designated as the regulating unit and would be manually adjusted to control the balance between generation and load to maintain system frequency at the desired value.

The remaining units would be controlled with speed droop to share the load in proportion to their ratings. With automatic systems, many units in a system can participate in regulation, reducing wear on a single unit's controls and improving overall system efficiency, stability, and economy.

Where the grid has tie interconnections to adjacent control areas, automatic generation control helps maintain the power interchanges over the tie lines at the scheduled levels.

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With computer-based control systems and multiple inputs, an automatic generation control system can take into account such matters as the most economical units to adjust, the coordination of thermal, hydroelectric, and other generation types, and even constraints related to the stability of the system and capacity of interconnections to other power grids. Turbine generators in a power system have stored kinetic energy due to their large rotating masses.

All the kinetic energy stored in a power system in such rotating masses is a part of the grid inertia. When system load increases, grid inertia is initially used to supply the load. This, however, leads to a decrease in the stored kinetic energy of the turbine generators. Since the mechanical power of these turbines correlates with the delivered electrical power, the turbine generators have a decrease in angular velocity, which is directly proportional to a decrease in frequency in synchronous generators.

The purpose of the turbine-governor control is to maintain the desired system frequency by adjusting the mechanical power output of the turbine.

For steam turbines, steam turbine governing adjusts the mechanical output of the turbine by increasing or decreasing the amount of steam entering the turbine via a throttle valve. 6 step ROUNDED RECTANGULAR infograhic🔥🔥🔥-PowerPoint Presentation-Slide Design-Free Template

The goal of economic dispatch is to minimize total operating costs in an area by determining how the real power output of each generating unit will meet a given load. An economic dispatch algorithm will run every few minutes to select the combination of generating unit power setpoints that minimizes overall cost, subject to the constraints of transmission limitation or security of the system against failures.

From Wikipedia, the free encyclopedia. Power System Analysis and Design. Cengage Learning. Dorf ed. Electricity delivery. Transmission and distribution. Demand response Distributed generation Dynamic demand Electric power distribution Electricity retailing Electrical busbar system Electric power system Electric power transmission Electrical grid Electrical interconnector High-voltage direct current High-voltage shore connection Load management Mains electricity by country Power line Power station Power storage Pumped hydro Smart grid Substation Single-wire earth return Super grid Transformer Transmission system operator TSO Transmission tower Utility pole.Grids or meshes are geometrical shapes formed after discretisation of the geometric domain which are small-sized discrete cells that cover the physical domain, whose objective is to identify the discrete volumes or elements where conservation laws can be applied.

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They have applications in the fields of computational fluid dynamics CFDgeographydesigning and many more places where numerical solutions to the partial differential equations PDEs are required. Numerical grid generation is the crucial initial step involved in computing numerical solutions to the equations that describe a physical process. The accuracy of the solution depends upon the quality of the grid generated.

Mesh generation

A well-constructed grid can improve the quality of solution whereas, deviations from the numerical solution can be observed with a poorly constructed grid. Techniques for creating the cell forms the basis of grid generation. Various methods for the grid generation are discussed below. The grid generation by algebraic methods is based on mathematical interpolation function.

It is done by using known functions in one, two or three dimensions taking arbitrary shaped regions. The computational domain might not be rectangular, but for the sake of simplicity, the domain is taken to be rectangular.

The main advantage of the methods is that they provide explicit control of physical grid shape and spacing.

grid generation ppt

The simplest procedure that may be used to produce boundary fitted computational mesh is the normalization transformation. Like algebraic methods, differential equation methods are also used to generate grids. The advantage of using the partial differential equations PDEs is that the solution of grid generating equations can be exploited to generate the mesh. Grid construction can be done using all three classes of partial differential equations.

Elliptic PDEs generally have very smooth solutions leading to smooth contours. Using its smoothness as an advantage Laplace's equations can preferably be used because the Jacobian found out to be positive as a result of maximum principle for harmonic functions.

Transforming above equations in computational space yields a set of two elliptic PDEs of the form. The advantage of using elliptic PDEs is the solution linked to them is smooth and the resulting grid is smooth.

But, specification of P and Q becomes a difficult task thus adding it to its disadvantages. Moreover, the grid has to be computed after each time step which adds up to computational time. This grid generation scheme is generally applicable to problems with open domains consistent with the type of PDE describing the physical problem.

The advantage associated with hyperbolic PDEs is that the governing equations need to be solved only once for generating grid. The initial point distribution along with the approximate boundary conditions forms the required input and the solution is the then marched outward. Steger and Sorenson [5] proposed a volume orthogonality method that uses Hyperbolic PDEs for mesh generation. The second equation links the orthogonality of grid lines at the boundary in physical space which can be written as.

While mesh being orthogonal is generated very rapidly which comes out as an advantage with this method.

grid generation ppt

The solving technique is similar to that of hyperbolic PDEs by advancing the solution away from the initial data surface satisfying the boundary conditions at the end. Nakamura and Edwards developed the basic ideas for parabolic grid generation. The idea uses either of Laplace or the Poisson's equation and especially treating the parts which controls elliptic behavior.