E R A C S
Case Studies

Power System Analysis for Wind Farm Connection Using Power Systems Analysis Software European Wind Energy Association Conference Brussels 2011

31-03-2011

The penetration of wind energy has grown significantly in the past few years, resulting in the construction of large-scale onshore and offshore wind farms. The technical development of large wind turbine generators facilitates the connection of the large wind farm into the transmission network. Power system analysis study to design the grid connection and verify compliance with regulatory codes and international standards is required during the design stage.

In this paper a DFIG wind turbine is modelled using a power systems analysis software package (ERACS) to examine the voltage at the terminal of the wind turbine as a result of voltage dip on the grid. The fault ride through study allows verification that the WTG provides the reactive power during the fault and the voltage at the PCC is quickly restored to its initial value after the fault is cleared.

Another scenario discussed is determining the need for reactive power compensation. A wind farm with 24 2.3MW wind turbines was modelled. A reactive and power factor capacity study was conducted based on the model and the British grid code [1]. The results show that an 8.35MVAr of inductive compensation and a 10.9MVAr of capacitive compensation at PCC are required. If the compensation is applied at the 33kV bus, a 0.52MVAr of inductive compensation and a 0.68MVAr of capacitive compensation are required.

A harmonic study based on the Energy Networks Association Recommendation G5/4-1 was also conducted. Typical current harmonic injection data is used in this paper. The THD and harmonics with order 10 exceed G5/4-1 planning levels due to the high charging capacitance on underground cables used in wind farm collector systems. The harmonic study in this paper shows harmonic compliance is dependent on not only on the number of turbines operating and the power level, but also the configuration of the distribution circuits that are selected at any given time.

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System Analysis & Protection Co-ordination Study for Riverside STW Thames Water

01-01-2005

RINA conducted electrical power system analysis, including the provision of protection settings for all the protective devices from the 11kV Distribution Network Operator (DNO) intake point down to the main 415V distribution switchboards.

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System Analysis & Protection Co-ordination Study for St George's Hospital NHS Trust

01-01-2005

RINA conducted electrical power system analysis, including the provision of protection settings for all the protective devices from the 11kV Distribution Network Operator (DNO) intake point down to the main 415V distribution switchboards.

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Protection Co-ordination Study for BT Faraday Building 24 Seven

01-01-2005

RINA provided protection settings for all overcurrent devices from the BT 11kV point down to the incomer to 415V distribution switchboards.

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