在线滚动的单步电压控制优化模型  

Online Rolling Single-Step Voltage Control Optimization Model

作　　者：张芳[1] 郭灿灿[1] 李传栋[2] 

机构地区：[1]智能电网教育部重点实验室(天津大学),天津市南开区300072 [2]国网福建省电力有限公司电力科学研究院,福建省福州市350007

出　　处：《电网技术》2016年第12期3849-3856,共8页Power System Technology

摘　　要：针对中长期电压不稳定问题,提出一种在线滚动的单步电压控制优化模型。该模型基于轨迹灵敏度,在每次滚动优化过程中仅预测求取当前时刻应投入的动作,并使用一种随滚动优化在线调整的期望轨迹,以确保优化问题有解。为提高模型的求解效率及实用性,使用显式欧拉法计算轨迹灵敏度,以减小轨迹灵敏度的计算量;基于轨迹灵敏度计算结果提出控制筛选指标,以减少优化问题中的控制量个数,降低优化问题的复杂度;滚动跟踪系统中低电压母线以增强模型的针对性,同时减少约束条件的个数。仿真验证结果表明,所提电压控制优化模型能快速完成优化问题的求解,优化解能使系统轨迹准确地跟踪期望值;所提模型在负荷模型参数存在一定偏差的情况下依然具有较好的鲁棒性。In this paper, a rolling single-step voltage control optimization model is proposed to prevent mid-long term voltage instability in power systems. The proposed model based on trajectory sensitivity only predicts and calculates controls at current sampling instant during each optimization and a desired trajectory adjusted along with rolling optimization is adopted to make sure existence of optimization solution. In order to improve efficiency and practicality of the proposed model, trajectory sensitivity is calculated with explicit Euler integral method to relieve computational burden. A control screening index based on trajectory sensitivity is proposed to reduce control variable number and optimization complexity; tracing LV bus along with rolling optimization to make the proposed model well-targeted and reduce constraint number at the same time. Simulation results demonstrate that the optimization problem can be solved rather fast with the proposed model. With optimal solutions, system trajectory can trace desired value precisely. The proposed model has good robustness even at presence of load model parameter perturbations.

关 键 词：电压稳定 中长期 模型预测控制 轨迹灵敏度 控制筛选指标 低电压母线 

分 类 号：TM712[电气工程—电力系统及自动化]