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        • Aurora works across a wide range of traditional power generation systems, from small CHP units up to large industrial power generation facilities. We have extensive experience in considering synchronous generators fault contribution into the network, as well as considering issues such as dynamic response and transient stability of synchronous generators.

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        • Aurora provides a range of services to the Renewables and Battery Energy Storage Systems industries, and can provide advice on analysis on greenfield developments or integration into existing brownfield industrial facilities. We specialise in providing grid simulation and G99 compliance studies to support renewable connections to the UK network, and other European networks.

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        • Aurora has extensive experience in the transmission and distribution sector, dealing with private 11kV and 33kV networks, iDNOs and DNOs and National Grid, for a variety of different design and analysis applications.

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        • Aurora has extensive experience in the Oil & Gas industry, and has undertaken a wide range of design activities, concept studies and simulation studies to support many large international EPC companies and service companies.

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        • Aurora works in light and heavy industry providing a range of services to help plant owners analyse and understand their networks, identify weak spots, providing guidance on system loadings, fault levels, earthing, protection coordination and arc flash.

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        • Aurora has worked on a number of large data centres, providing a range of services to support existing specialist companies in this area, such as system analysis for fault levels, harmonic analysis, protection coordination and arc flash analysis.

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        • Aurora has extensive experience in the water industry and has worked fs, identify weak spots, providing guidance on system loadings, fault levels, protection coordination, motor starting earthing and arc flash. We also have extensive experience in helping water companies integrating renewalbe power and battery storge technologies into their sites.

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        • Load flow, fault analysis, P28/2 voltage disturbance including flicker and transformer inrush, G5.5 Harmonics, G99 Grid studies, protection coordination, arc flash, dynamic and transient studies and electromagnetic transients.

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        • Earth potential rise (EPR) calculations and touch and step voltage calculations with either CDEGS or XGSLab, earthing layouts, soil resistivity testing, fall of potential tests, earthing inspections and resistance testing.

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        • Concept development and decarbonisation strategies, preparations of G99 and National Grid connection applications, review of ICP and vendor proposals, due diligence checks and client representative and failure investigations.

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Dynamic and Stability Studies – What are they?

One of the more interesting studies to carry out during power system analysis are those associated with power system dynamics and studies. These are some of the more complicated studies that we carry out and are time based simulations to see how a system responds to a disturbance over a finite time period – usually anything from a few milliseconds to perhaps 30s.

Dynamic and Stability studies are usually associated with classical synchronous machines. They are used to assess a variety of scenarios such as transient faults, critical clearing times, load acceptance and rejection, dynamic motor starting and the need for Power System Stabilisers (PSS). But with G99 / Grid code they are also associated with studies such as Fault Ride Through, Frequency Response (LFSM / FSM) and QV voltage control studies.

These type of studies are usually carried out as Root Mean Square (RMS) time based simulation and need accurate information on the synchronous machine, along with its various controllers such as the governor, AVR / Exciter and any OEL / UEL or PSS equipment present. They are also used to parameterise various inverter controllers for solar, battery storage and wind sites where the inverter controls need to be set and configured to meet the various performance requirements of the TSO.

In more recent years there has been a move away from RMS stability studies to consider stability as an Electromagnetic Transient (EMT) based phenomena, which considers the interaction between control systems of inverters and classical synchronous machines.

The studies carried out for G99 / Grid Code compliance are a small subset of these types of studies. Where they get really interesting is in modelling of complete networks (large scale grids or microgrids) where aspects of frequency stability, voltage stability and small signal stability need considering. Typical Studies include:

  • Dynamic Studies
  • Transient Studies
  • Grid Code / G99 Studies
  • Synchronous Machine operation and response
  • AVR/Exciter configuration and tuning
  • Governor configuration and tuning
  • PSS tuning (difficult!)

Aurora can help in a variety of these studies – if you would like to know more please get in touch.