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一种计算结果与平衡母线位置选择无关的动态潮流模型 |
A Dynamic Load Flow Model Which the Results Irrelevant to the Slack Bus Selection |
投稿时间:2018-07-19 修订日期:2018-10-11 |
DOI: |
中文关键词: 动态潮流 平衡节点 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:国家自然科学基金项目(面上项目,重点项目,重大项目) |
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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母线位置选择相关,或没有考虑频率动态过程的问题。针对上述问题,本文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、机组和负荷的功率-频率静特性、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,包括平衡母线,的功率增量全部与频率偏差成比例关系,可解决常规潮流中计算结果与平衡母线位置选择相关问题。IEEE-39节点测试系统的仿真算例表明,本文提出的算法计算结果不依赖平衡节点的选择,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 power flow pattern and its trend should be recognized for earlier decisions to ensure the safety and stable operation. The proposed load flow methods have limitations, such as, the calculation results are relevant to the position of the slack bus, or no considerations to the frequency dynamic process. A dynamic load flow model which the results irrelevant to the slack bus selection 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, frequency characteristic of generator and load, system active power loss, will be coordinated and solved in a set of simultaneous equations. This ensure the power deviation of the generators include slack bus is in proportion to frequency deviation, with which the problem of the traditional load flow model that the calculation results are relevant to the position 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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