Feature: System Design
Considerations for plant operators Power stations nearing the end of their operational life face unique challenges. For those with only a few years remaining, the focus is oſten on increased maintenance and refurbishment to ensure short term reliability. EES specialises in both maintenance
and refurbishment of excitation systems, offering tailored solutions based on the operational context and age of synchronous machines, whether motors or generators. Tis allows EES to recommend the most cost-effective strategy that aligns with the plant’s immediate needs and long term sustainability goals. Conversely, stations with a longer
expected lifespan might invest in replacement to benefit from modern technology and improved performance. Balancing the options is crucial. EES provides comprehensive evaluations to ensure continued operational efficiency and reliability throughout the plant’s lifecycle, regardless of the maintenance strategy. Grid code compliance is also a critical
consideration. Refurbishment typically adheres to the existing grid code rules established at the time of original installation, making it a less complex and more cost-effective option. In contrast, replacement oſten requires compliance with updated standards, adding complexity and expense due to the necessary studies and demonstrations. Tese regulatory requirements will
costing upwards of £1,000,000 with a 4-to- 8-year payback period, focuses on targeted upgrades like digital controls and solid- state devices. Tese upgrades replace older mechanical systems for improved voltage regulation and reliability. However, older components like electrolytic
capacitors and motorised potentiometers may require ongoing maintenance. Integrating new technologies requires compatibility checks and soſtware updates to support the new functionalities. While extending operational life, refurbishment of excitation systems may not achieve the comprehensive reliability of a complete refurbishment. By comparison, the complete replacement
of the excitation control system typically includes supply of new excitation front end, programmable logic controller (PLC), thyristor bridges and other critical components. Tis approach not only restores the system to optimal conditions but also addresses potential issues, ensuring it continues to operate effectively and meets current standards. Despite the higher costs, potentially 65 per
cent more than refurbishment, and extended downtime of days to weeks, replacement ensures the excitation control system maintains peak performance and long-term reliability. Tis makes it more suitable for systems requiring extensive upgrades.
impact the decision-making process, as ensuring compliance with new standards may involve additional planning and resources. Understanding the implications of grid code compliance is essential for power plant operators when choosing between maintaining and refurbishing. Te decision between refurbishing and
replacement of excitation systems demands careful consideration. Tailored solutions are essential for power plant upgrades to ensure reliability and operational availability. To talk to an expert on whether
maintaining or refurbishing is best for your excitation system, or to see about bespoke electrical excitation panels specific to your needs, visit
excitationengineering.co.uk.
www.electronicsworld.co.uk November 2024 31
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