Reliability of HVDC Cable Systems for the Exploitation of Renewable Energy Sources系列讲座: Understanding about and dealing with space charge


讲座名称: Reliability of HVDC Cable Systems for the Exploitation of Renewable Energy Sources系列讲座: Understanding about and dealing with space charge
讲座时间 2018-03-15
讲座地点 East Building I North Meeting Room
讲座人 Peter Morshuis

讲座题目: Understanding about and dealing with space charge
讲座时间: 2019年3月15日 10:00-12:00
讲座地点: East Building I North Meeting Room
讲座人: Peter Morshuis
威尼斯官方网站 Introduction

The attention given to high voltage direct current (HVDC) cables appears to be at an all-time high. There are several reasons for this, one of the most important probably being the worldwide attention on harvesting renewable energy at a scale the World has never seen before. The prices of building large offshore windfarms in Europe as reflected in a recent normalized cost of electricity have unexpectedly dropped in the last years, which will further accelerate the development of HVDC cables to link offshore and onshore substations. The winning bid in 2016 for the Borssele II, 700 MW offshore windfarm in the Netherlands was as low as 54.5€ (US$61)/MWh, making the price comparable to energy produced by classic coal fired power plants.
Perhaps the strongest drivers now are the developments of high power HVDC corridors on land in Germany and China. In Germany a large amount of offshore wind generation needs to be integrated into the grid, requiring a 525 kV corridor from North to South (Südlink). A very substantial part of this corridor will be realized with underground HVDC links because of the low public acceptance of overhead power lines. TransnetBW GmbH has estimated that Germany will require new HVDC transmission corridors with a total length of between 2,600 and 3,100 km and with a total transmission capacity of 12 GW. While many HVDC subsea systems have been installed successfully, such underground systems on land pose considerable challenges, many of which relate to the choice of insulation system within the HVDC cable. In China the developments in the field of HVDC are further speeding up. In 2016 there are some 22 HVDC transmission systems commissioned or in operation, including the ±800 kV Shanghaimiao-Shandong HVDC project with a planned transmission capacity of 10 GW. In May 2017 the Chinese president Xi Jinping announced further details about the One Belt One Road policy, including energy corridors connecting China and Europe. In addition, strategic projects are being planned to interconnect Asian countries.
The decisions to transport electrical energy over very long distances will naturally lead to increasing voltage levels. A substantial part of the HVDC corridors will have to be installed underground, using HVDC cable technology. While major cable and cable insulation manufacturers are developing polymeric HVDC cables for higher and higher operating voltage [640 kV cross-linked polyethylene (XLPE), 700 kV MI-PPL], the question remains how far we can go with pushing the current technologies to even higher voltage levels.

The lectures

This short series of lectures therefore sets out to make students aware of the challenges we are faced with globally (the bigger picture) in creating a reliable and environment friendly HVDC grid, and from there move on to more specific problems. Although the focus of the lectures is on HVDC cable systems, the general approach is also valid for other components in an HVDC grid.
The lectures will introduce the students to the main differences between designing for DC and AC. It will be described how and why space charge, temperature and operating conditions have such a pronounced effect on the design.
The main ageing and failure mechanisms under DC voltage will be reviewed and their relation with testing techniques will be elucidated. How to design a testing strategy will be a major point of attention.
Finally, the operation of HVDC cable systems is discussed in terms of economics (how to get most energy transported) and long time reliability (how to ensure an availability of the systems for 30 years).
Many of the topics presented in these lectures are very relevant right now, and they will become even more relevant in the near future. By the end of this series of lectures you should have become fully aware of the challenges and you should have (part of) the background and the tools to help the HVDC future.
The lectures will be taught in English by someone with an entirely different culture. One of the intentions is to bridge the different cultures and create an atmosphere in which there is not only a transfer of knowledge but also an exchange between students and professor. This will be a challenging and hopefully exciting process.


·         Introduction to HVDC
·         Global and Chinese developments in HVDC
·         HVDC and the exploitation of renewable energy sources

o    Offshore wind energy
o    Long distance interconnections
威尼斯官方网站 o    Sea versus land

威尼斯官方网站·         HVDC insulation basics

o    Electric fields, polarization and space charge
威尼斯官方网站 o    The importance of temperature

·         Basic design of HVDC insulation systems
威尼斯官方网站 ·         Space charge

o    Mechanisms
o    Measurement

·         Aging and lifetime of HVDC insulation systems
·         Performance optimization of HVDC components
·         Testing, statistics
·         On-line monitoring
·         The main challenges in the field of HVDC

Learning goals:

·         To know the main application areas of HVDC
·         To be able to explain why HVDC is important for the large-scale exploitation of renewable energy sources
·         To know how an insulating material responds to the application of a DC voltage
·         To know the difference in behavior between AC and DC stressing of an insulating material
·         To be able to explain the importance of temperature under DC
·         To know the operating conditions of HVDC components and how they affect the insulation
·         To be able to make a basic design of an HVDC insulation system
·         To understand how space charge may affect the behavior of HVDC insulation systems
·         To understand the basic mechanisms leading to space charge accumulation
·         To know the main aging and breakdown mechanisms under DC
·         To understand which factors affect the lifetime of HVDC insulation systems
·         To be able to make a basic design of a testing procedure of HVDC components
·         To understand how on-line monitoring can be used to optimize performance and availability of HVDC components
·         To know the main challenges in the field of HVDC

威尼斯官方网站Prior knowledge required:

·         Electric fields under AC
·         Basics of high voltage AC components
·         AC aging and breakdown

Reference (If any):

1.   Book: Industrial High DC Voltage, F.H. Kreuger (PDF “hand-out”)
威尼斯官方网站 2.   Various literature (PDF “hand-out”)


Peter Morshuis has an MSc and PhD degree in electrical engineering.
His mission is “To motivate young people to be creative and to explore the world at the interface between different fields of science. To organize events in which scientists with different fields of expertise have in-depth discussions about challenging research. To start research projects in the field of HVDC and renewables for a more sustainable future.”.
Between 1999 and 2016 he was an associate professor in high voltage engineering at Delft University of Technology in the Netherlands.
His main research fields are HVDC, nanocomposites, partial discharges, space charge, functional materials, and monitoring and diagnostics of insulation systems. Currently he is working on new generation UHVDC cable systems and on ocean wave energy converters based on electroactive polymers.
In 2012 he founded Solid Dielectric Solutions, a company focusing on training and education and consultancy in the field of dielectrics and electrical insulation.
In 2015 he started with three friends and colleagues the IEEE DEIS Summer School series in Bertinoro, Italy, a new way of motivating and challenging PhD students in the field of dielectrics and electrical insulation. In 2016 the Summer School was organized in Xi’an, China, and in 2019 the fifth Summer School will be organized again in Bertinoro, Italy.
Very recently, in January 2019, he became visiting professor at Xi’an Jiaotong University for three years sponsored by the Shaanxi 1000 Talents Programme.
威尼斯官方网站 He is chairman of the IEEE DEIS Publications committee, chairman of the IEEE International Conference of Dielectrics and active in various IEEE and Cigré committees. In 2013 he was rewarded with the IEEE Eric O. Forster Memorial Lecture and in 2015 he became a distinguished IEEE DEIS lecturer.

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