| 1. | The applicable principle of these four different reference frames is discussed comprehensively in aspect of small signal analysis and excitation law designs
根据系统矩阵稳定性和状态向量的区别，详细讨论了4种不同参考系在小扰动稳定分析和励磁调节器设计方面的适用原则。 |
| 2. | The absolute and relative stability of multi - machine is analyzed intuitionally using the open - loop frequency characteristic charts and the performance index of open - loop frequency domain for each decoupling single - machine
频域分析法在多机系统小扰动稳定方面的研究尚没有达到工程实用的要求。 |
| 3. | To study the reduced - order analysis methods that not only can satisfy the need of the system scale but also have higher calculation precision has an important academic value and practical project sense
研究既可满足系统规模要求、又有较高分析计算精度的多机电力系统小扰动稳定降阶分析方法，具有重要的学术研究价值和工程现实意义。 |
| 4. | Based on the review and present tendency analysis for small signal stability research , in this thesis , the reduced - order analysis method for small signal stability of multi - machine power system using detail model is researched
本文在回顾分析电力系统小扰动稳定研究的发展历程及其研究现状的基础上，开展了基于详细模型的多机电力系统小扰动稳定降阶分析方法的研究工作。 |
| 5. | The set of these eigenvalues can be regarded as the eigenvalues of primary system approximately . this method not only can control the scale of the block - decoupling subsystems , but also achieves the reduced - order eigenvalue calculation for multi - machine power system . so this method can avoid the dimension disaster in the qr and calculate all the eigenvalues of large power system with the effect of damping windings considered
这一方法可以控制分块解耦子系统的规模，实现多机系统特征值的降阶计算，避免特征值qr算法的“维数灾难” ，同时为采用计及发电机阻尼绕组作用的详细模型计算大型电力系统的全部特征值、提高电力系统小扰动稳定分析的准确性提供了一种方法。 |
| 6. | It includes the model of decision rule and the model of association rule . based on the presented models as well as available knowledge of power system security and stability , this dissertation constructs rule models for transient stability decision , transient stability criterion decision based on phasor measurement units and small disturbance stability decision . during the modeling , feature selection , feature generalization , process of decision rules and new splitting method of decision tree are proposed
6 )论文提出了电力系统安全稳定规则构建模型，包括决策规则构建、关联规则构建，并依据电力系统安全稳定领域知识，构造了暂态稳定决策规则模型、基于相角测量系统的暂态稳定判据模型、小扰动稳定规则模型，提出了适于决策规则建模的特征选择、特征概化、决策规则的进一步处理策略，并定义了新的决策树分支方法。 |
| 7. | 5 ) this dissertation presents new predictive models for the transient stability and small signal stability based on support vector machine theory that can solve the problems such as finite samples . a new method of feature selection and sample condensation is proposed to build predictive model which improves the practicability of the model greatly
5 )论文首次利用基于小样本技术的支持向量机理论，设计了新的暂态稳定、小扰动稳定特征值预测模型，提出了新的适合预测模型构建的特征选择、数据采样策略，提高了模型的实用性。 |
| 8. | Through analyzing the phenomenon of the pseudo complex value in the block - decoupling method , the pseudo complex value is considered as the result of eigenvalue variation because of the system being decoupled forcedly , but this phenomenon has no effect on the result of the small signal stability
对模糊分块解耦法可能出现的伪复根现象进行分析，认为伪复根是将原本存在机电耦合的子系统强行解耦导致特征值“变异”的一种现象，一般不会影响小扰动稳定分析的结果。 |
| 9. | With the building and operation of the project " electric power transmission from west to east " and the forming of the nationwide power system ' s inter - connection , the problem of power system small signal stability is more notable . the research standard on the small signal stability cannot adapt to the needs that are propitious to the enlarging scale of power system and the levels of stability analysis and control
随着“西电东送”工程的建设投运和全国互联电力系统的逐步形成，电力系统的小扰动稳定问题更加突出，而当前电力系统小扰动稳定研究水平还不能很好地适应电力系统规模扩大和稳定分析与控制水平提高的要求。 |
