13 December 2011

Successful R2 Testing of Port Lincoln 3 Generating System

A refurbished 29.4 MVA gas turbine unit has recently been installed and commissioned by International Power GDF Suez subsidiary Synergen Power at its Port Lincoln Power Station site located in the Lower Eyre Peninsula of South Australia. The power station previously comprised two gas turbine generators, each rated for 24 MW. It is a peaking plant and typically supplies power into the National Electricity Market at times of high demand, or when transmission issues require local generation. The new unit, PL3, comprises: Port Lincoln Power Station Unit 3_1

- A single shaft 29.4 MVA Alstom Frame 5 gas turbine generator;
- An Invensys Triconex digital automatic voltage regulator (AVR) and turbine control system; and
- A brushless exciter.

DIgSILENT Pacific undertook the task to support Invensys and Synergen in the connection of PL3 with the following activities:

- R1 Model and data development for the AVR, governor and synchronous machine;
- Design of control systems and grid connection study;
- Model development and validation for ElectraNet (the local transmission grid owner) and AEMO (the market operator) submission; and
- R2 testing of the AVR, governor and synchronous machine;

The R2 testing for the AVR, governor control system and the synchronous machine was performed to meet the requirements of the NER to verify the R1 data and models. The outcome was submission of validated R2 data and models to ElectraNet and AEMO.
The tests were executed in coordination with the Invensys engineers and Synergen operators and coincided with the commissioning of PL3. The following tests performed in both frequency and time domains were performed: Port Lincoln Power Station Unit 3_2

- Open- and short-circuit saturation curve;
- Frequency response test of the AVR control system;
- Offline and online voltage step response;
- Partial and full Load rejections;
- Frequency response testing;
- Load step responses;
- Operation of limiting devices; and
- Resistance measurements.

DIgSILENT was able to make full use of its test equipment, particularly the PowerFactory Monitor for high speed data acquisition, and the Digital Signal Analyser and frequency response testing.

Based on the results and outcomes of using PowerFactory's Parameter Identification algorithm, a generator model, an AVR model and governor model was developed and validated and proposed suitable for modelling the generating system of PL3.