Yanan Wu

Quench protection of the poloidal field superconducting coil system for the EAST tokamak

This paper gives a description of the poloidal field coil quench protection (QP) and control of the EAST poloidal field power supplies. A configuration of the QP hardware and an operating scenario are presented; the QP design principle in the EAST tokamak is also introduced.

Design and Test Results for the PF Power Supply System of EAST

Abstract The EAST superconducting tokamak is an advanced steady-state experimental device built at the Institute of Plasma Physics, Chinese Academy of Sciences between 2000 and 2006. This paper describes the poloidal field EAST power supply. The configuration and design of the power supply and its operation scenario are presented. A unit test and whole power supply test results are also discussed in detail.

On the Sequential Control of ITER Poloidal Field Converters for Reactive Power Reduction

Sequential control applied to the International Thermonuclear Experimental Re- actor (ITER) poloidal fleld converter system for the purpose of reactive power reduction is the subject of this investigation. Due to the inherent characteristics of thyristor-based phase-controlled converter, the poloidal fleld converter system consumes a huge amount of reactive power from the grid, which subsequently results in a voltage drop at the 66 kV busbar if no measure is taken. The installation of a static var compensator rated for 750 MVar at the 66 kV busbar is an essential way to compensate reactive power to the grid, which is the most efiective measure to solve the problem. However, sequential control of the multi-series converters provides an additional method to improve the natural power factor and thus alleviate the pressure of reactive power demand of the converter system without any additional cost. In the present paper, by comparing with the symmetrical control technique, the advantage of sequential control in reactive power consumption is highlighted. Simulation results based on SIMULINK are found in agreement with the theoretical analysis.

Summary of the 1st International Workshop on Environmental, Safety and Economic Aspects of Fusion Power

The 1st International workshop on Environmental, Safety and Economic Aspects of Fusion Power (ESEFP) was held on 13 September 2015 at Jeju Island, South Korea. The workshop was initiated by the International Energy Agency Implementing Agreement on a Co-operative Program on ESEFP. The workshop was well attended with about forty participants representing twelve institutions in ten countries. The presentations covered safety issues and environmental impacts, availability improvement and risk control and socio-economic aspects of fusion power. Safety and licensing gaps between DEMO and ITER were discussed in depth with the consensus output presented as a plenary presentation at the 12th International Symposium on Fusion Nuclear Technology (ISFNT-12). The next workshop is planned to be held in conjunction with the ISFNT-13 in 2017.