International Transactions on Electrical Energy Systems最新文献_第8页

Synchrophasor-Based Out-of-Step Prediction in Large Grids 大型电网中基于同步信号的失步预测

IF 2.3 4区工程技术 Q1 Mathematics

International Transactions on Electrical Energy Systems

Pub Date : 2023-12-26 DOI: 10.1155/2023/4012120

Zainab Alnassar, S. T. Nagarajan

Out-of-step (OOS) condition is a potential problem in the power system and uncontrolled islanding is one of the severe consequences of out-of-step condition which leads to cascaded tripping of the system. To avoid this undesired cascaded tripping, early prediction of out-of-step condition is essential before losing the synchronization of generators and between the system areas. Controlled islanding is the last emergency action that can be taken by splitting the system intentionally into coherent islands. Conventionally, OOS condition has been detected with impedance-based measurement techniques which have their own limitations. With the implementation of a wide-area measurement system with synchrophasor measurement units (PMUs) in the power system, it is now possible to measure the bus voltage angle at a much faster rate than with SCADA. In this paper, synchrophasor-based bus voltage angle measurement has been used for early prediction of OOS condition in power systems. A new algorithm has been formulated for both generator and tie lines based on the trajectory of first and second derivatives of the bus voltage phase angle for early detection of OOS condition. The prediction speed of proposed method is found to be between 5% and 70% of time to OOS, after disturbance clearance. The proposed algorithm has been mathematically formulated and evaluated with three benchmark systems in real-time simulation environment with an OPAL-RT real-time simulator and a HYPERSIM platform.

失步（OOS）状态是电力系统中的一个潜在问题，失控孤岛是失步状态的严重后果之一，它会导致系统级联跳闸。为了避免这种不必要的级联跳闸，必须在发电机和系统区域之间失去同步之前及早预测失步状态。受控孤岛是可以采取的最后一种紧急措施，即有意将系统分割成多个相干的孤岛。传统的 OOS 状态是通过基于阻抗的测量技术来检测的，这种技术有其自身的局限性。随着在电力系统中采用同步测量单元 (PMU) 的广域测量系统，现在可以比 SCADA 更快的速度测量母线电压角。本文将基于同步信号的母线电压角测量用于电力系统 OOS 状况的早期预测。根据母线电压相位角一阶导数和二阶导数的轨迹，为发电机和连接线制定了一种新算法，用于早期检测 OOS 状况。在扰动消除后，发现所提方法的预测速度为 OOS 时间的 5%至 70%。在 OPAL-RT 实时仿真器和 HYPERSIM 平台的实时仿真环境中，用三个基准系统对所提算法进行了数学计算和评估。

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