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中文摘要：
提出了一种可实时检测次同步谐振（sub-synchronous resonance，SSR）的方法。首先采样电流信号，计算其近似熵（approximate entropy，ApEn）；然后在连续时间区段上，观察近似熵的变化规律判断是否发生次同步谐振，还分析了近似熵的实时性、很好的抗干扰能力以及同时处理随机信号和确定性信号的能力等；最后在IEEE第1标准测试系统模型上进行仿真。仿真结果证明了基于近似熵的次同步谐振检测方法的有效性。
英文摘要：
A new approximate entropy-based method, which can perform real-time detection of sub-synchronous resonance （SSR）, is proposed. Firstly, the current signal is sampled and its approximate entropy is calculated; then whether SSR occurs or not is judged by observing variation law of approximate entropy in continuous time intervals, in addition, the real-time performance of approximate entropy, its good anti-interference ability and its ability of processing random signals and deterministic signals are analyzed; finally, the proposed method is simulated by IEEE first benchmark system model. Simulation results show that the approximate entropy-based SSR detection method is effective.
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