协调经济性及电压稳定性的受端系统紧急负荷控制优化方法

发布时间：2018-03-01 18:52

本文关键词： 高压直流输电紧急负荷控制电压薄弱性原对偶内点法　出处：《电力系统自动化》2017年17期 　论文类型：期刊论文

【摘要】：特高压直流逆变站闭锁后,应在确保受端系统安全稳定的前提下尽量减小紧急控制的经济代价,同时,为了使逆变器尽快恢复正常运行,控制后的系统还需要提供足够的无功支撑,为此提出了一种协调经济性及电压稳定性的受端系统紧急负荷控制优化方法。首先,讨论了事故发生后受端系统的动态响应,提出根据电压薄弱性指标识别受端系统的若干电压薄弱节点,将其电压跌落量的平方和作为电压稳定性指标;然后,计算控制方案对应的负荷损失及事故罚款,将两者之和作为经济指标。为克服分段优化问题的求解困难,首先将分段的事故罚款曲线进行了近似光滑处理;然后,在考虑频率、电压及潮流等约束条件的基础上,以经济性、电压稳定性指标的加权和最小为目标,构建紧急负荷控制优化问题的数学模型,并应用原对偶内点法快速求解;最后,以含高压直流输电的IEEE 10机39节点系统为例,对算法进行了验证。结果表明,协调经济性及电压稳定性的优化控制可在不增加经济代价的前提下,改善控制后系统的电压稳定性,有助于逆变站恢复运行。
[Abstract]:After the UHVDC inverter station is locked, the economic cost of emergency control should be minimized under the premise of ensuring the safety and stability of the receiving end system. At the same time, in order to restore the inverter to normal operation as soon as possible, It is necessary to provide sufficient reactive power support for the controlled system. In this paper, an optimization method for emergency load control of the receiver system is proposed, which coordinates economic efficiency and voltage stability. Firstly, the dynamic response of the receiver system after an accident is discussed. According to the voltage weakness index, some weak voltage nodes of the receiver system are identified, and the square sum of the voltage drop is taken as the voltage stability index, and then the load loss and accident penalty corresponding to the control scheme are calculated. In order to overcome the difficulty of solving the piecewise optimization problem, the piecewise accident penalty curve is treated with approximate smoothness, and then, on the basis of considering the constraint conditions such as frequency, voltage and power flow, the sum of the two is taken as the economic index. The mathematical model of the optimization problem of emergency load control is constructed with the objective of economy and the weighted and minimum voltage stability index, and the original dual interior point method is applied to solve the problem quickly. Finally, the IEEE 10 machine 39 node system with HVDC transmission is taken as an example. The results show that the optimal control of coordinated economy and voltage stability can improve the voltage stability of the control system without increasing the economic cost and help the inverter station to resume operation.
【作者单位】：河海大学能源与电气学院;国网江苏省电力公司;
【基金】：国家电网公司科技项目(SGJS0000DKJS1501031)~~
【分类号】：TM712;TM721.1

【相似文献】