基于WAMS的自适应低频减载动态优化策略

在《电力安全事故应急处置和调查处理条例》(599号令)中，提出了在故障处理过程中的负荷切除量等同于故障损失负荷量，这要求电网在安全稳定运行的前提下尽可能地少切或不切负荷，以降低事故控制代价。因此，提出计及负荷频率调节效应、P-V特性和负荷重要度的减载贡献因子来有效指导低频减载过程中的选址定容。通过分析电压突变因素对不平衡功率的影响以提高功率缺额计算式精度，依据系统频率变化率的梯度变化逐轮次地动态优化减载量，以期充分发挥系统频率的自恢复调节能力。IEEE 39节点系统仿真分析表明，所提出的低频减载动态修正优化策略，能够在减少切负荷控制代价的同时改善系统频率恢复水平，从而兼顾频率紧急控制的经济性与可靠性要求。

WAMS based dynamic optimization of adaptive under-frequency load shedding

The rule No.599 of power grids in China indicates that the shedding load is equivalent to the failure loss load, which requires less load-shedding as much as possible under the premise of security and stability, to reduce the cost of frequency accident control. Therefore, in this paper, the load-shedding contribution factor based on frequency regulation effect, P-V characteristic and the importance of the load is designed to indicate the placement of load shedding and the allocation of the load to be cut. The influence of voltage leap on unbalanced power is analyzed to improve the calculation accuracy. A dynamic correction scheme is described to adjust load-shedding amount of each steps according to change rate of frequency derivative, to fully utilize the self-recovery capacity of system frequency. Simulation based on IEEE 39-bus system shows that the new strategy could reduce the load shedding amount and improve frequency recovery process, in which both the reliability and economy are taken into consideration.