【摘要】 为了对系统的振荡模式有一全面了解,根据系统所依据的数学模型介绍了各种常用的低频振荡分析方法及最新发展趋势,论述了一次系统所采用的各种抑制振荡措施及其优缺点,并提出了一种新的稳定控制思路。当系统总阻尼变弱甚至为负时低频振荡更易发生,因为此时扰动被放大且引发功率振荡,因此抑制振荡的要点在于增加系统阻尼。最后总结和展望了未来控制发展和研究内容。更多还原

【Abstract】 The frequent and massive power exchange on tie-line between different areas makes the low frequency oscillations, especially in the inter-area mode it is more serious, and it impairs system stability and its performance. To get a better solution to above problems, the authors introduces some main model analysis methods based on different mathematical models, such as frequency-domain, time-domain, transaction identification and some nonlinear analysis to get a basic and accurate knowledge of the oscillation mode. Generally, the oscillations is more easy to happen in the case when the system total damping is becoming weak or even negative, it is mainly because the disturbance is magnified when the negative damping of the system exceeds its inherent damping and it causes power oscillations directly, thus it is wise to provide additional damping to suppress system oscillations. According to the above analyses, it can be mainly divided into the following stages, the former classic control phase, the traditional PSS control, the linear and nonlinear optimization control as well as the synthesis and robust self-adaptation stage. After analyzing their advantages and disadvantages, a new way based on the theory of differential manifold is put forward. Besides the above measures on the primary system, the control on electric secondary system such as flexible AC transmission system also plays an important role in oscillation reduction.更多还原