基于广域局部量测信息的复杂电力系统自适应低频保护策略研究

Adaptive Under Frequency Load Shedding Schemes for Complex Power Systems Using Local Measurements

在深入分析大规模电力系统动态频率响应特性的基础上,提出功率缺额扰动情况下多区域复杂互联电网故障区域辨识方法,并建立基于广域局部瞬时量测信息的功率缺额估计模型。本文提出的基于广域局部瞬时量测信息的自适应低频保护策略,克服了传统低频保护策略存在的过切负荷、频率过冲和频率悬停等问题。以17机69节点电力系统为例,进行数值仿真,并对结果进行讨论,证明了本文提出的广域自适应低频保护策略的有效性。

In this paper, the characterizations of the dynamic frequency response of complex power systems are analyzed firstly. Then a novel adaptive control strategy for under frequency protection and load shedding associated with synchronous phase measurement unit(PMU) is proposed in this paper. With the help of the PMU, the magnitude of active power deficit is estimated by using the simplest expression of the generator swing equation and static load model since the frequency, voltages and their rate of change can be obtained by means of the local measurements in real-time. Then, a robust control strategy with consideration of the uncertainties in system is presented. The effectiveness and robustness of the proposed control strategy are investigated carrying out on 17-generator 69-bus test system under various disturbance scenarios.