分叉理论在钻井系统电压稳定性

为提高钻井系统电压稳定水平,防止电压崩溃事故的发生,采用分叉理论研究了油田钻井系统中电力系统的电压稳定性问题.建立了钻井系统中的发电机、负荷及钻井系统网络模型,得出钻井系统电压稳定分析的一般模型,分析了电网中的分叉现象,并仿真搜索了电力系统的电压动静分叉点.在此基础上,利用发电机组的无功进行了各阶段的电压失稳分析.结果表明:静分叉时的系统电压单调失稳至崩溃,动分叉时的系统电压发生振荡.该结论有利于深入了解钻井系统的运行特性,对维护系统电压稳定有着积极的作用.

Application of bifurcation theory in drilling system voltage stability analysis

To improve the drilling system voltage stability level and prevent taking place the collapse of voltage, the bifurcation theory is adopted to research the voltage stability problem in oil field drilling system. The model of generator, loads and drilling system is established separately, then general model of voltage stability analysis in drilling system is obtained, bifurcation phenomenon in power grid is analyzed, at last dynamic and static voltage bifurcation points of electric system are simulated and searched. On the basis, the voltage instability analysis in successive stage is undertaken by making use of reactive power of generators. Results show that system voltage loses stability up to collapse in static bifurcation and generates oscillations in dynamic bifurcation. The results are in favor of inquiring operating characteristic in drilling system deeply, and play an active role in maintaining system voltage stability.