文章摘要
申家锴,穆永强,王春生,王勇,王鹤霏,张蓉蓉,李卫东.一种计算结果与平衡节点位置选择无关的动态潮流模型[J].,2019,59(2):179-185
一种计算结果与平衡节点位置选择无关的动态潮流模型
A dynamic load flow model with results irrelevant to position selection of slack bus
  
DOI:10.7511/dllgxb201902010
中文关键词: 动态潮流  平衡节点  特高压交直流混联电网  大功率缺失
英文关键词: dynamic load flow  slack bus  UHV AC/DC hybrid power system  high-power deficiency
基金项目:国家自然科学基金资助项目(51677018).
作者单位
申家锴,穆永强,王春生,王勇,王鹤霏,张蓉蓉,李卫东  
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中文摘要:
      特高压交直流混联电网运行中,需要实时掌握系统潮流变动态势,提早决策,以保证电力系统的安全稳定运行.而现有潮流算法存在诸如计算结果与平衡节点位置选择相关,或没有考虑频率动态过程的问题.针对上述问题,提出了一种不受平衡节点位置选择影响的动态潮流模型.通过将系统频率变量引入常规潮流方程中,使得惯性、发电机组和负荷的功频静特性、系统运行有功功率损耗等与系统运行频率相关的变量可以在一组联立方程内进行协调求解,从而保证所有发电机组包括平衡节点的功率增量全部与频率偏差呈比例关系,可解决常规潮流中计算结果与平衡节点位置选择相关问题.IEEE-39节点测试系统的仿真算例表明,所提算法计算结果不依赖平衡节点位置选择,且计算速度快,可满足在线运行要求.
英文摘要:
      In UHV AC/DC hybrid power system operation, the load flow pattern and its trend should be recognized for earlier decision to ensure the safe and stable operation. The existing load flow methods have limitations, such as the calculation results being relevant to the position selection of the slack bus, or no considering the frequency dynamic process. A dynamic load flow model with results irrelevant to position selection of the slack bus is proposed, in which frequency is introduced as a variable in the traditional load flow model. In the new model, the variables which associated with frequency changes, such as inertia, power-frequency characteristic of generator and load, system active power loss, are coordinated and solved in a set of simultaneous equations. This ensures the power deviation of the generators including the slack bus is in proportion to frequency deviation, with which the problem of the traditional load flow model, whose calculation results are relevant to the position selection of the slack bus, is solved. Numerical simulation results of IEEE-39 node test system show that the calculation results are not depend on the position selection of the slack bus and fast computational speed can meet the on-line operation requirement.
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