ELEC5509 Grid Integration of Renewable Energy

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1. Specification

You will need to research on the operation of renewable power systems (via consulting lecture slides, unit reading material and beyond) to optimise your system.

There are two possible options associated with this project:

1.1 Design of a 3.3kV 500kW Wind Turbine System (Learning Out- comes 1, 3, 4)

Your consultancy engineering company (UWA Engineering) has been contracted to design and construct a 500 kW wind turbine. Western Power, who manages the high voltage trans- mission grid that the wind turbine will connect to, will charge your client signi cant penalty fees based on the wind turbine’s technical performance.

Create a Matlab/Simulink simulation with vector control applied to either the Doubly Fed Induction Machine (DFIG) or Full Converter wind turbine architecture.

For this part of the project you must model the nonlinear nature of the power electronics

i.e. not as a controllable voltage source. The grid may be modeled as an ideal voltage source.

The electric machine can be modeled by using the d-q equivalent circuit model devel- oped in Computer Laboratory 2.

The control can simultaneously track the maximum power point of the wind resource, regulate DC-link voltage, and limit power punctuations (as much as possible) into the grid, as well as provide power factor control.

An appropriate switching frequency can be chosen, and power electronic efficiency and harmonic performance can be estimated / quantified.

1.2 Selection and optimisation of the energy generation mix in each of the interconnected power grids.  (Learning Outcomes 2, 3, 4, 5)

Horizon Power, the responsible utility for providing electricity to regional and remote Western Australia, has engaged the consultancy engineering company you are employed at (UWA Engineering) to design a technical solution for establishment of two interconnected power grids located at Town A and Town B.

Horizon Power have offered significant performance bonuses for maximising the penetration level of renewables within the power grids, without decreasing the high level of expected power quality and reliability. The following sources of generation are available in each town:

Diesel generator;

Gas Turbine;

Photovoltaic (PV) farm;

Distributed household rooftop PVs; and

Wind turbine(s).

In selecting a mix of the above generation sources you should consider the following:

Town A has a baseload power of 1MW, with a peak load of 3MW. The largest load that can be instantaneously switched on or o at any time is 500kW.

Town B has a baseload power of 2MW, with a peak load of 3.5MW. The largest load that can be instantaneously switched on or o at any time is 200kW.

Sufficient primary, secondary and tertiary reserves should be available to meet the N-1 criterion.

There are two 33kV AC transmission lines that interconnect Towns A and B. Trans- mission of power through these lines, and the associated long-term voltage stability, should meet the N-1 criterion.

The two critical, or worst-case, scenarios in terms of grid reliability and power quality that the system must withstand are:

12 noon – PV generation is at its peak, wind generation is at 50% of its peak, load is at 50% of its peak.

7pm – Load is at its peak, PV generation is 0%, wind is at its peak.

A protection system, with appropriate fault clearing times, can be designed to meet the N-1 criterion.

PV and Wind inverter control schemes may be modified to improve system performance. For this task you can assume each renewable source acts as a controllable voltage source that injects a reference active/real and reactive/imaginary power (i.e. no need to model the non-linear aspects of the power electronics).

Note: There should be no voltage sources acting as a swing/slack bus.

2. Assessment Criteria

This is an individual project worth 30% of your grade.

Each student needs to select either Section 3.1 or Section 3.2. A Matlab/Simulink model must be developed, both the model and an accompanying report describing your design must be submitted in Week 44 (Friday 3rd November by 5 pm). Your report should be between 1000 and 2500 words. Any reference list is excluded from the word- limit.  Adding unnecessary volume to the report will weaken the key arguments and will attract lower marks. Students should thus carefully consider the value of content in the report. As per the unit outline, where an assignment exceeds the word limit, a penalty of 1 per cent of the total mark allocated for the assessment task applies for each 1 per cent in excess of the word limit. Mode of submission will be online via LMS.

The Project 2 mark will also be impacted by the student’s conduct over the duration of the project i.e. whether the student is organised, attends and is well prepared for the computer laboratories.

Students will be assessed on demonstrating understanding of the technical aspects of renewable energy systems.

Students should utilise Matlab/Simulink to aid in design/confirmation of the proposed design.

A detailed marking rubric is available on LMS.

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