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Issue 4 | April 2017
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Release of PowerFactory 2017 (Service Pack 2)

DIgSILENT PowerFactory provides an all-in-one software solution to power system analysis needs, including high-end and new technological requirements. This unique software allows for cost efficient data handling, modelling and functionality thereby promoting highly-optimised workflows.
 
In PowerFactory 2017, a range of improvements have been made to the handling and data management with a series of additional convenience functions, improved modelling flexibility and enhanced capabilities of various analysis functions. PowerFactory 2017 also comes with a series of enhancements to the network diagrams and graphic representation tools.
 
  Read more about PowerFactory 2017 >>

DIgSILENT Pacific Presents At The IEEE Power And Energy Society For APPEEC

IEEE Power and Energy Society (PES) Queensland chapter successfully organised a large-scale, international power electrical engineering conference for the Asia Pacific region in Brisbane, Australia in mid-November 2015.

The APPEEC (Asia-Pacific Power and Energy Engineering Conference) 2015 attracted a large number of registrations and paper submissions from Australia, China, and also countries outside the Asia Pacific region including USA and South Africa.  The conference attracted a good distribution of paper submissions from students, academics and industry representatives.


As part of DIgSILENT Pacific's commitment to the power engineering industry, we took the opportunity to participate, and presented three papers:
  • Meeting New Distribution Power System Challenges, presented by Levin Mardira.
  • Sensitivtity Studies and Calibration of Small Signal Models, presented by Joseph Leung.
  • Small Signal Sensitivity Technique for Determining Interconnector Transfer Limits, presented by Joseph Leung.
  Read more about these papers >>

Release of StationWare 2016 (Service Pack 3)

DIgSILENT StationWare stores and records all protection settings in a central database, allows modelling of all relevant workflow sequences, provides quick access to relay manuals, interfaces with manufacturer-specific relay settings software, and integrates with PowerFactory software, allowing powerful and easy-to-use settings coordination studies.
 
DIgSILENT has released StationWare 2016 R3, which continues to provide enhancements and improvements to our 2016 version. Key product highlights include among others:
  • Official support for Windows Server 2016 and Microsoft SQL Server 2016.
  • Improved search and filter support in the user interface.
  • A number of bug fixes in the user interface and framework.
The new version is available from DIgSILENT StationWare Download Area to registered users with valid guarantee/maintenance. For more information on StationWare please also refer to the StationWare brochure that can be downloaded from DIgSILENT GmbH

Improving the operation of the Bangladesh power system

DIgSILENT Pacific was engaged to investigate frequency control of the Bangladesh power system. DIgSILENT observed the real-time operations, merit order dispatch and the existing frequency control practices and issues with the National Load Dispatch Centre (NLDC). DIgSILENT demonstrated a trial remediation strategy using governors on selected generating units operating autonomously in droop control mode. On the third visit to Bangladesh, DIgSILENT presented training to the PGCB, NLDC, Bangladesh Power Development Board (BPDB) and a number of power plant companies on topics related to frequency control of power systems, dispatch optimisation, international practice and long-term objectives for Bangladesh.
 
In addition, DIgSILENT Pacific was engaged to undertake a project aimed at improving the operation of the Bangladesh power system now and into the future, to facilitate more efficient operation of generation. The power system is currently in a phase of rapid expansion, which is placing pressure on the operation of the network. DIgSILENT developed a model of the transmission and generation system for the years 2016, 2020 and 2025. Following a series of optimal power flows (OPF) that dispatches in an economically least cost arrangement, DIgSILENT identified critical constraints that cause economic impacts from forced non-optimal dispatch of generation in the system and offered recommendations for the future Bangladesh power system.
Figure 1 - Tim George and Wayne Ong from DIgSILENT Pacific in Bangladesh with attendees from the PGCB, NLDC, BPDB and a number of power plant companies.

Ergon Energy Update

By Roly Jarrett 
Article kindly supplied by Ergon Energy

Ergon Energy is a regional electricity distributor in Queensland, servicing more than 700,000 customers in one of the largest distribution networks in the world. Ergon Energy owns assets encompassing traditional poles and wires infrastructure and conventional isolated diesel generation through to state of the art battery and inverter grid support systems, concentrating PV, a geothermal power station and wind generation stations. On the customer and LV side, Ergon Energy also has one of the largest installed base of customer PV systems in the world, and a growing volume of loads and generators under demand management arrangements. To help manage this network, Ergon requires a comprehensive modelling tool which is able to provide a range of analysis types.

With delivery partners SPARQ Solutions, Accenture and DIgSILENT, Ergon Energy has integrated DIgSILENT PowerFactory with their GIS, Asset database, Protection database and metering data to maintain an up to date set of models describing their network.  
 
  Continue reading this update >>

Technical review of the Laos – Vietnam interconnector

DIgSILENT Pacific was engaged to identify options for an interconnector between Laos and Vietnam.  Laos has abundant water resources for hydro power, and is currently undergoing a phase of rapid development of its hydro generation. Hydro power is a major source of export earnings for Laos.

The installed generation capacity in Laos increased from 2550 MW in 2010 to 5800 MW by early 2016. Most of this generation (around 76%) is from Independent Power Producers with dedicated export contracts (IPPe).


Currently most of the power exported from Laos is imported into Thailand, to the west of Laos.  However, Vietnam, to the east of is in the process of introducing an electricity market, and there may be opportunities for Lao hydro to supply demand in Vietnam through a system-to-system interconnection. At present the only connections from Laos to Vietnam are from generators not connected to the Laos power grid.
  Continue reading this article >>
PowerFactory Tips

Harmonic considerations in PowerFactory studies

DIgSILENT's PowerFactory software supports both balanced and unbalanced harmonic load flows according to different methodologies.  The PowerFactory manual is clear on the correct modelling approach of energy sources, but sometimes the implications are not well understood.

As an example, Figure 1 shows the harmonic tab of a static generator where it is often assumed that the Norton equivalent harmonic impedance is very large (e.g. the default PowerFactory parameters).
However, should the user wish to consider the actual Norton equivalent frequency dependent parameters, it should be noted that harmonics native to the negative sequence symmetrical component (2nd, 5th, 8th, … etc) will also be injecting harmonic current into the negative sequence source impedance of generating sources even when conducting a balanced harmonic load flow simulation. 
 
This PowerFactory tip suggests that the negative sequence source impedance is modelled for balanced simulations  (including for the balanced IEC method) when it is important to consider the source impedance.  In many cases, the assumption would be made that the Norton equivalent negative sequence source impedance is equal to the positive sequence source impedance.  However, when these impedances are considered in wind or solar farms, the net result would typically be that there is more local damping of the harmonic current injected into the system and therefore typically this would reduce the THD at the point of common coupling. Therefore, careful consideration of the modelling requirements is therefore recommended when modelling the source impedance.
Figure 1 -  Harmonic tab of a static generator in DIgSILENT's PowerFactory software.

Digexdyn and Digexfun DLLs in PowerFactory

Do you know how to load Digexdyn and Digexfun DLLs into PowerFactory?
Read more about this tip >>
Upcoming Training Seminars

Melbourne                                       

Stability/DSL Training 2 days Tue/Wed 02-03 May 2017
Frequency Control Training
Expressions of Interest Only
2.5 days Wed/Fri 19-21 July 2017
Power Quality & Reliability Analysis Training 3 days Tue/Thurs 15-17 August 2017
Generator Control Systems, Stability and Compliance 2.5 days Wed/Fri 20-22 September 2017
Protection Analysis & Stability/DSL Training 4 days Tue/Fri 10-13 October 2017


Brisbane                                       

PowerFactory Fundamentals & Python Training 5 days Mon/Fri 05-09 June 2017
**Click on each seminar title above for more information or to register.**
 
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Melbourne * Perth * Brisbane
Head Office Ph: +61 3 8582 0200
Website: www.digsilent.com.au
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DIgSILENT Pacific · Level 13 · 484 St Kilda Road · Melbourne, Victoria 3004 · Australia