摘要
常规的汽轮机控制器包括小扰动控制和汽门快关 ,产生两个相对独立的控制信号。本文提出了一种基于最优复合控制策略的连续转速控制器 ,由 2组结构完全相同、参数增益不同的控制器组成 ,可以对转速偏差调节和汽门快关进行连续的控制 ,可以在整个控制过程中进行无扰动切换 ,避免了常规的开关式汽门快关的缺点。这种控制器考虑了汽轮机的非线性 ,进行了线性化 ,采用了满足稳态和暂稳态的线性二次最优控制。仿真比较了所研究的复合控制器和常规的控制器在三相短路和故障后带本地负荷暂稳态的情况。结果表明 :这种复合控制器有良好的控制特性。图 4参
Continuous speed controllers for small disturbance and transient stability using a optimal linear quadratic controller are given, the controllers include the speed droop control and fast-valving, the disadvantages of the usual bang-bang fast-valving are avoided. The usual controllers include two parts, one for small disturbance, the other for severe disturbance, the signals generated by the two parts are less interactive. The proposal controllers have same construction and their differences are only the tuning of their parameters, they complete the continuous control and are switched with a less sharp transience. With the feedback linearity and robustness, the proposal controllers are used for ensuring the perfect condition of transient stability, the non-linearity of the steam turbine is also considered. The results of simulation are compared between the proposal controllers and the usual controllers, and show that the proposal controllers are better dynamical characteristics of the transient stability, especially in the cases of short-circuit, islanding and temporary loss of synchronism. Figs 4 and refs 6.
出处
《动力工程》
CSCD
北大核心
2002年第5期1965-1968,2000,共5页
Power Engineering
