Calculate Center-of-Inertia Frequency and System RoCoF Using PMU Data
Calculate Center-of-Inertia Frequency and System RoCoF Using PMU Data
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DOI：
10.1109/pesgm46819.2021.9638108
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
Shutang You;Hongyu Li;Shengyuan Liu;Kaiqi Sun;Weikang Wang;W. Qiu;Yilu Liu
中科院分区：
文献类型：
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作者：
Shutang You;Hongyu Li;Shengyuan Liu;Kaiqi Sun;Weikang Wang;W. Qiu;Yilu Liu
电力系统的频率对系统的整体稳定性至关重要。但是，由于系统惯量的分布特性和同一同步系统中不同发电机转子的电转速不一致较小，系统频率不存在单一测量点。本文提出了一种利用多位置PMU数据更精确地计算系统惯量中心（CoI）频率和频率变化率（RoCoF）的新方法。CoI频率和RoCoF值进一步用于帮助快速估计频率事件的不平衡MW量。在美国东部互联系统中实际测量的测试结果验证了所提出方法的有效性。
The power system frequency is important for the system overall stability. However, there does not exist a single measurement point of the system frequency due to the distributed nature of the system inertia and the small inconsistency of different generator rotors' electrical speeds in one synchronized system. This paper proposed a new approach to calculate the system center-of-inertia (CoI) frequency and the rate-of-change-of-frequency (RoCoF) more accurately using PMU data at multiple locations. The CoI frequency and the RoCoF value were further used to assist fast estimation of the imbalance MW amount of a frequency event. Test results using actual measurements in the U.S. Eastern Interconnection system validated the effectiveness of the proposed method.