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ID: 150860

Impact of unplanned power flows in interconnected transmission systems – case study of Central Eastern European region / Singh, Antriksh; Frei, Thomas ; Chokani , Ndaona ; Abhari, Reza S

Abhari, Reza S	Journal Article
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Summary/Abstract

The unplanned power flows at the interconnections of the Central Eastern Europe and Central Western Europe electricity markets are assessed. The assessment is accomplished using optimal power flow simulations of the linked transmission systems of Germany, Poland, the Czech Republic, Austria and Switzerland. The unplanned flows are modeled using a multivariate model that is a function of time series of wind- and solar-generated electricity, power demand and commercial power flows. It is shown that for the case of Poland there is a 25% higher loading on sections of transmission grid in Poland due to the unplanned flows. The unplanned power flows are largely a consequence of the wind-generated electricity in northern Germany that must be routed to southern Germany through the grid in Central Eastern Europe region due to an inadequate grid capacity along the north–south German corridor. It is shown without the planned 2020 developments of the grid, Poland's grid will be very susceptible to congestion and destabilization.

Key Words

Renewables ; Transmission Grid ; Power Systems ; Optimal Power Flow

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ID: 113419

Large scale technical and economical assessment of wind energy : case study Iowa / Grassi, Stefano; Chokani, Ndaona; Abhari, Reza S

Grassi, Stefano	Journal Article
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Publication

2012.

Summary/Abstract

The development of new wind energy projects requires a thorough analysis of land use issues and constraints. At ETH Zurich, an analytical approach has been developed using a Geographic Information System (GIS) to define the location of suitable sites for wind projects and to predict their economic exploitable energy production. The purpose is to estimate the average Annual Energy Production (AEP), with a GIS customized tool, based on physical factors (environmental and anthropological constraints), the wind resource distribution and the technical specifications of the large-scale wind turbines currently present in the US market. Economics data and regulatory parameters are also included. The wind energy potential of the state of Iowa has been estimated: the resulting average AEP of Iowa is 914 TWh and the potential total installed capacity is 302 GW. A sensitivity analysis of the influence of the Power Purchase Agreement (PPA) shows that a PPA of 6.5 c$/kWh would enable to exploit the 85% of the buildable land with an IRR greater than 15%. This approach is applicable to both larger and more limited regions in order to support energy planners and wind farm developers to set energy strategies and to scout new profitable lands.

Key Words

GIS ; Economic Exploitable Wind Energy Potential ; Power Purchase Agreement (PPA)

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