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Delegates are invited to meet and discuss with the poster presenters in this topic directly after the session 'Storage & grid integration' taking place on Wednesday, 12 March 2014 at 16:30 -18:00. The meet-the-authors will take place in the poster area.

Vidar Grønås National Instruments, Norway
Co-authors:
Vidar Grønås (1) F P
(1) National Instruments, Drammen, Norway (2) National Grid, Warwick, United Kingdom

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Abstract

Power system monitoring for grid integration and operation of evolving UK transmission network

Introduction

In the last decade, the electricity supply industry has changed dramatically. Offshore and onshore wind generation has been connecting at an ever-increasing rate and fossil-fired synchronous plants are closing as we embrace the decarbonisation of our electricity supply. With these changes come fresh challenges for operating the system, and power quality has increasingly been at the top of the agenda for grid integration of renewables. National Grid, network owner and operator, needs to understand and manage this impact, and take steps to ensure operation of a secure network for all of their customers.

Approach

Develop an instrument that can do standard power quality measurements, like power harmonics, phase unbalance, voltage dips, flicker and transients. But a requirement was to build on a platform that allows the researchers to add functionality and to adopt to future application needs. One example is to do synchronized measurements over a wide area by using a GPS and to add phasor measurements.

Main body of abstract

Before adding a connection to the grid, National Grid needs to understand what impact a connection will have on the existing power system. There are a number of factors to be considered like production capacity of the wind power plant, transmission capacity in the power system, local consumption profiles, what type of compensation is needed and the capacity of compensation, grid configurations etc. Measurements have shown that wind power plants cause disturbances on the power system and the operator needs to understand what impact these disturbances have on the stability and quality of the power delivered. Traditional measurement systems have been designed to meet specific measurement needs and do not offer the researcher the capability to add custom algorithms and new mathematical methods when needed to extract new phenomena. By using a state of the art computing platform based on a CPU and an FPGA co-processor National Grid was able to develop their own custom instrumentation that met their changing requirements.

Conclusion

The requirements on the power system is changing rapidly with the adoption of renewable generation. To meet these challenges the grid operator needs to develop new measurement and control algorithms to control the power grid. Existing measurement systems lacks capabilities in many areas like, sampling speed, accuracy and algorithms. A new software defined approach for instrumentation is the way forward.


Learning objectives
Learn what impact wind power plants have on the power system and see how grid operators are approaching these challenges to make sure the grid can scale and secure a stable infrastructure for all customers.