Large-scale photovoltaic (PV) power plant has witnessed a dramatic increase in the integration into transmission and distribution network, manifesting subsynchronous control interaction (SSCI) when the host grid is weak. In this work, the oscillation modes of a typical PV network are analyzed, and a faster-than-real-time (FTRT) emulation is proposed for predicting the SSCI and consequently mitigating its impacts on AC grid by taking the effective active/reactive power control action. The electromagnetic transient (EMT) simulation is utilized to model the PV panels and converter stations to reflect the actual dynamic process. Meanwhile, the AC grid undergoes transient stability (TS) simulation to obtain a high speed up over real-time, and consequently, a power-voltage interface is adopted for the coexistence of different simulation methods. The reconfigurability and parallelism of the field-programmable gate arrays (FPGAs) enable the EMT-TS co-emulation strategy to run concurrently. With a remarkable 122 FTRT ratio, the proposed hardware emulation can provide an effective solution before the SSCI causes serious disruption following its detection. The hardware emulation results are validated by the off-line simulation tool Matlab/Simulink® and TSAT® in the DSATools™ suite.

中文翻译：

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通过超实时动态仿真抑制大型光伏装置中的次同步控制交互


大型光伏电站并入输配电网的数量急剧增加，在主电网较弱时表现出次同步控制相互作用（SSCI）。在这项工作中，分析了典型光伏网络的振荡模式，并提出了一种超实时（FTRT）仿真来预测 SSCI，从而通过采用有效有功/无功功率来减轻其对交流电网的影响控制动作。利用电磁瞬态（EMT）仿真对光伏电池板和换流站进行建模，以反映实际的动态过程。同时，交流电网进行暂态稳定（TS）仿真以获得实时的高速，因此采用功率-电压接口来实现不同仿真方法的共存。现场可编程门阵列 (FPGA) 的可重构性和并行性使 EMT-TS 协同仿真策略能够同时运行。凭借出色的 122 FTRT 比率，所提出的硬件仿真可以在 SSCI 检测后造成严重中断之前提供有效的解决方案。硬件仿真结果由 DSATools™ 套件中的离线仿真工具 Matlab/Simulink® 和 TSAT® 进行验证。