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.

中文翻译：

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ITER电源与无功补偿系统协调控制策略研究

ITER电源的稳定运行离不开无功补偿（RPC，由可控硅控制的电抗器和滤波器组成）系统的优化控制。然而，在等离子体控制系统的恶劣工况下，具有高延迟的传统RPC控制方案已不能满足负载侧的实际无功需求。基于李雅普诺夫理论，通过设计导数全局始终为负的李雅普诺夫函数，提出并分析了RPC系统的新控制律。在李雅普诺夫渐近稳定性分析的帮助下，设计了一种新的控制器，称为 Q 李雅普诺夫函数控制（QLC），与现有的解决方案相比，实现了良好的动态性能。仿真结果表明，在负载产生的无功功率发生瞬态变化的过程中，QLC控制的电网侧无功功率消耗得到了极大的降低。因此，交流母线电压具有很强的鲁棒性。此外，还表明 RPC 系统可以全局稳定以处理严重的信号干扰。