模型组合及其在直流输电系统可靠性评估中的应用

"西电东送"及全国电网互联的趋势加快了对直流输电问题的研究.高压直流输电系统的建模是研究直流输电问题的重点,若模型过于复杂,则不利于问题的研究.文章建立了高压直流输电系统中各子系统的数学模型,通过寻找子系统之间的微弱联系,将各子系统的模型进行层层组合,得到整个高压直流输电系统的等效模型,进而进行可靠性评估.文章还提出了模型组合及化解状态空间"维数灾"的方法,所得结论对高压直流输电、交直流输电及多馈入交直流输电系统的可靠性评估有一定指导意义.

MODELS COMBINATION AND ITS APPLICATION IN RELIABILITY EVALUATION FOR HVDC SYSTEMS

The study on DC power transmission is speeded up by the project of "Power transmission from West China to East China" and the trend of nation-wide power system integration. The modeling of HVDC system is the key problem in the research of DC power transmission. When the model is too complicated, the research will be difficult. Here, the mathematical models for each subsystems in HVDC system are established and after finding the weak relation among the subsystems, the combination of the models for subsystems are combined layer upon layer to obtain an equivalent model of the whole HVDC system, and then the evaluation of reliability is carried out. The method to combine the models and the way to dissolve "dimension disaster" are put forward. The obtained conclusion may be available for reference in the reliability evaluation of AC/DC hybrid transmission system, HVDC transmission system and multi-infeed AC/DC hybrid transmission system.