Abstract
As a new generation of direct current (DC) transmission technology, voltage sourced converter (VSC) based high voltage direct current (HVDC) has been widely developed and applied all over the world. China has also carried out a deep technical research and engineering application in this area, and at present, it has been stepped into a fast growing period. This paper gives a general review over China’s VSC based HVDC in terms of engineering technology, application and future development. It comprehensively analyzes the technical difficulties and future development orientation on the aspects of the main configurations of VSC based HVDC system, topological structures of converters, control and protection technologies, flexible DC cables, converter valve tests, etc. It introduces the applicable fields and current status of China’s VSC based HVDC projects, and analyzes the application trends of VSC based HVDC projects both in China and all over the world according to the development characteristics and demands of future power grids.
Highlights
The transmission technology has gone from direct current (DC) to AC, AC to DC and to coexist technological evolution
To verify the effect of the high voltage direct current (HVDC) Flexible system in wind power integration, the manual shot-circuit tests were carried out, and the results indicated that this project can substantially improve the low voltage ride through capacity of wind power plants
Flexible and made HVDC Flexible become one of the main transmission modes used by the power grids
Summary
The transmission technology has gone from DC to AC, AC to DC and to coexist technological evolution. The operating principle of this concept is that the AC active power and reactive power may be controlled by switching on and off the VSC or changing the voltage phase angle and amplitude so as to effectively overcome some existing defects This concept was formally named as ‘‘VSCHVDC’’ in the International Conference on Large HV Electric Systems (CIGRE) and America Electrical and Electronic Project in 2004, as HVDC Light [5], HVDC Plus and HVDC MaxSine by the international companies of ABB, Siemens and Alstom respectively. I.e. engineering technology, application and future development, this paper firstly analyzes the challenges that the technical development of HVDC Flexible projects currently faces, future development orientation of relevant technology and expected targets. It analyzes the potential development of the HVDC Flexible projects and the project application prospect both in China and all over the world
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