【作者】 匡文凯；

【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】 在线安全稳定分析与控制对系统安全经济运行有着重要的影响，随着电力市场与西电东送及全国电网互联战略的实施，在线稳定分析是实现电力系统安全稳定运行与控制的重要手段之一。本文围绕在线安全稳定分析中的预想事故排队展开研究。在线暂态稳定分析的难点是必须做到快速性与准确性的统一。为提高快速性，本文提出了一种新的数值积分方法，该方法结合显式积分法与隐式积分法的特点，将迭代法网络求解方法与本文提出的显式迭代方法结合起来，提出了具有隐式效果的交叉迭代数值积分方法。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。实际大规模系统仿真表明，本文方法显著地改善了隐式积分法的速度，在程序设计上具有很好的可扩充性与灵活性。同时本文在二群失稳模式的假设下，得出了机组电磁功率与转子相对惯性中心角的变化曲线为一正弦曲线。利用单机等面积稳定判据原理，采用时域仿真的方法对受扰系统进行短时间的仿真，根据仿真结果对机组电磁功率与转子相对角正弦曲线进行拟合。用拟合得到的正弦功角曲线预测机组的最大减速面积(或加速面积)，从而可以计算出系统的稳定裕度与不稳定裕度，根据稳定裕度与不稳定裕度的大小可进行预想事故严重程度排队。本文方法的特点是不必仿真到系统出现稳定或不稳定的条件即可预测系统是否稳定。对稳定系统，本文可得出基于加速面积与减速面积的稳定裕度。与已有方法相比，本文方法不必进行失稳模式的判别，且系统元件模型也很精确，通过实际大规模系统的分析验证了本文方法的快速性、可靠性和有效性。更多还原

【Abstract】 Online stability analysis and control is very important for security and economical operation of the power system. With the development of electric electricity market, the implementation of electricity transferring from the west to the east and national electric power network interconnection, it is realized that online stability analysis is one of the most important means for the system security operation. This paper studies the ranking of the potential contingencies. The difficult point of the transient stability analysis is that the solution needs fast computation speed and accuracy. For the purpose, the advantage of both explicit method and implicit method is combined, and a good numerical implicit integration with the performance of high precision and high computation speed is proposed in this paper. The proposed method improves the computation speed of current implicit numerical integration method used by the power industry significantly. Both of them have the same accuracy. 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. Meanwhile, under two-group instability modes, it is discovered that the curves between electric power of generator unit and rotator’s angle in relative to center of inertia is a sine curve. By using single machine equal area criterion (SGEAC) and combining with time domain simulation method, the disturbed system is simulated for a very short time period. According to the simulation result, the curve between electric power of generator unit and rotator’s angle in relative to center of inertia is fitted. Maximum deceleration area or maximum acceleration area of each unit is obtained according to the fitted curves and then the stability margin and instability margin for the system are obtained. According to the margin, the potential contingency set is ranked. The advantage of the method in this paper is that it is not necessary to simulate the disturbed system to the instant when the system loses its stability in order to determine whether the system is stable or not. For stable system, the stability margin based on single machine energy can be obtained. Compared with other methods, it is not necessary to determine the correct two group mode. Practical system analysis shows that the method is very fanst, very reliable and very efficient, and it should have wide engineering applications for on-line stability monitoring.更多还原