【作者】 刘堂伟；

【导师】 吴政球；

【作者基本信息】 湖南大学 ， 电力系统及其自动化， 2004， 硕士

【摘要】 加速电力系统轨迹仿真是电力系统暂态稳定分析强有力的手段之一。目前的数值积分方法包括显式积分法与隐式积分法两大类。显式积分法具有计算速度快与编程简单的优点，但存在交接误差，且数值稳定性不好。隐式梯形积分法具有精度高与数值稳定好的优点，但计算量大，编程复杂。本文结合显式法与隐式法的特点，将迭代法网络求解方法与隐式迭代方法结合起来，提出了具有隐式效果的交叉交替迭代数值积分方法，对所提方法的数值稳定性进行了深入的分析。实际大规模系统仿真表明：该方法显著地改善了目前工业界常用的隐式积分法的速度，但其精度与隐式积分法相同。系统失稳时，本文基于单机等面积准则，将故障后机组划分为前向和后向机群两个等值机群，并对两等值机群的电磁功率和转子惯性中心角度分别进行拟合，利用拟合得出的正弦曲线计算系统的切机和切负荷量。本文切机算法，在时域方针过程中对不稳定故障，在失稳时刻通过拟合近似功角曲线计算切机量，因此，可以计算不同运行状态下的各种不稳定故障的切机、切负荷量，克服了传统对策表查找法不能适应复杂运行环境和故障方式的不足。本文算法与两群相对运动切机算法比较，两者在理论上具有一致性，本文算法分别计算出切机和切负荷量。更多还原

【Abstract】 Fast transient stability simulation is one of the very important techniques for power system stability analysis. Currently, numerical integration methods are explicit method and implicit method. Explicit method has the advantage of high computation speed, but its disadvantage is that there are interfacing error between the differential equation and algebraic equation; implicit method has the advantage of high precision, but the computation burden is very heavy. In this paper, the advantage of both methods is combined, and a good numerical explicit integration with the performance of high precision and high computation speed is proposed. The proposed method improves the computation speed of current implicit numerical integration method used by the power industry significantly. It has the same accuracy with the implicit numerical integration method. Practical large scale system simulation shows that the method has good accuracy and computation speed and can be used for online power system stability analysis. It is easy to program this method. It is expected that the method can be used by the engineers widely. Based on single machine equal area criterion, a new generator-shedding algorithm is proposed. Using fast time domain simulation, when power system is judged unstable, devide generators into forward group and backward group, then power-angle curve can be simulated, based on single machine equal area criterion, which generators to be shedded can be caculated. Compared with tranditional generator shedding method using pre-caculated scheme, the proposed generator shedding algorithm is more adaped to different power system conditions and faults.更多还原