Research on Coordinated Control Strategy of ITER Power Supplies and Reactive Power Compensation System

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ORIGINAL RESEARCH

Research on Coordinated Control Strategy of ITER Power Supplies and Reactive Power Compensation System Dengge Jia1,2 • Jun Tao1,2 • Renjing Fan3 • Jing Lu4 Accepted: 11 November 2020 Ó The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature 2020

Abstract The stable operation of the ITER power supply is inseparable from the optimal control of the reactive power compensation (RPC, consisting of thyristor controlled reactor and turned filters) system. However, the traditional RPC control scheme with high latency can no longer meet the actual reactive power demand from the load side under the severe working conditions of the plasma control system. A new control law has been proposed and analyzed for RPC system based on the Lyapunov’s theory by designing a Lyapunov function, which derivative is always negatively definite globally. With the help of the Lyapunov’s asymptotic stability analysis, a new controller, which called Q Lyapunov-function-based control (QLC), has been designed to realize good dynamic performance comparing to the existed solutions. The simulation results show that the reactive power consumption of the grid side controlled by QLC has been greatly reduced during the transient change of the reactive power generated by the loads. Hence, the AC busbar voltage will have strong robustness. Moreover, it is also shown that the RPC system can be stabilized globally for handling severe signal disturbances. Keywords ITER power supply  Reactive power compensation system  Plasma control system  Lyapunov function

Introduction The ITER experiment is set up in Cadarache (France) to verify the feasibility of controlled nuclear fusion engineering. The ITER pulsed power electrical network (PPEN) is distributed under the three-winding step-down transformers by 400 kV, 66 kV and 22 kV busbar with 12 & Jun Tao [email protected] Dengge Jia [email protected] Renjing Fan [email protected] Jing Lu [email protected] 1

Anhui University, Hefei 230601, China

2

Power Quality Engineering Research Center, Ministry of Education, Hefei 230601, China

3

ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, St. Paul Lez Durance Cedex 13067, France

4

Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China

GVA nominal short circuit power, which feeds superconducting magnets and auxiliary heating systems (Fig. 1). During the experimental pulses, the active power consumption is up to 500 MW, and the reactive power demand can reach 950 MVar. It is necessary to reduce the impact of reactive power on 66 kV grid side. Therefore, a reactive power compensator (RPC, thyristor control reactor and tuned filter as fixed capacitor) with a capacity of 250 MVar is installed on each 66 kV bus side of the ac/dc converter to ensure the safe and reliable operation of the entire power grid [1–3]. Hence, it is worth to study which kind of control should be adopted by RPC syste

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