Distributed electrical current sensing for DC power networks

“近几十年来，高压直流（HVDC）输电的使用有所增长，因为电力电子技术使直流电能够轻松转换为交流电，这是一种更有用的电力形式。在未来十年中，由于海上发电的增长以及对最小化传输损耗的日益期望，对基于HVDC的电力系统的需求预计将大幅上升。鉴于高压直流输电市场（主要是海上发电的互连器和出口电缆）的增长，人们希望开发系统来提高直流输电平台的可靠性。Synaptec的仪器技术集成了光纤和压电技术，利用预装光纤促进沿沿着线的电压和电流的新型分布式测量。这为电力系统提供了前所未有的低成本可视性，使新的控制和保护功能能够在复杂的电路上实现。然而，目前成功用于测量交流电流的技术将不适用于直流电流的测量，需要新的方法和创新来将这个平台扩展到直流电路。在这个项目中，NPL将对直流电流测量技术进行文献综述，这些技术可能适合用作Synaptec广域分布式传感器平台的一部分。将比较潜在方法的优点和缺点，并将使用分析结果来确定是否可以实现合适的方法。选定的方法将减少到实践中与Synaptec合作。这项工作的目的是为Synaptec提供一个潜在的解决方案，可以进一步开发成一个原型产品。直流输电市场将对Synaptec的增长产生重大影响，该项目的成功将通过开发新的IP来提高清洁发电和长距离输电的可靠性和效率，从而使英国经济受益。"

"The use of High-Voltage Direct Current (HVDC) power transmission has grown over recent decades as power electronics have enabled DC power to be converted easily to AC, which is a more usable form of electricity. Over the coming decade, demand for HVDC based power systems is expected to rise substantially due to growth in adoption of offshore power generation and an increasing desire to minimise transmission losses. Given this growth in the HVDC transmission market (primarily interconnectors and export cables for offshore generation), it is desirable to develop systems to improve the reliability of DC power transmission platforms.Synaptec's instrumentation technology integrates optical fibre and piezoelectric technologies to facilitate novel distributed measurements of voltage and current along transmission lines using the pre-installed optical fibres. This offers unprecedented power system visibility for a low cost, enabling new control and protection functions to be implemented on complex circuits. However, present techniques that are successfully employed to measure AC current will not work for measurement of DC current, and new approaches and innovations are required to extend this platform to DC circuits.In this project, NPL will conduct a literature review of DC current measurement techniques that may be appropriate to be used as part of Synaptec's wide area distributed sensor platform. The merits and drawbacks of potential methods will be compared and the results of this analysis will be used to establish if a suitable method can be realised. Selected methods will be reduced to practice in collaboration with Synaptec. The aim of the work will be to provide Synaptec with a potential solution that can be further developed into a prototype product.Accessing the DC power transmission market would have significant impact on Synaptec's growth, and the success of this project will benefit the UK economy through development of new IP with the potential to improve the reliability and efficiency of clean power generation and transmission over long distances."