在热力过程控制系统中,通过选择合适的非线性P I控制器,能使系统的动态性能得到显著改善。利用S im u link工具箱中的非线性设计模块(NCD模块)对4种P I控制器的参数进行优化,并基于M on te-C arlo实验原理计算和分析不同控制系统的性能鲁棒性。仿真结果表明:所选的4种控制器中,其中一种非线性P I控制器对4类典型热力过程控制系统的动态性能均有显著改善,系统输出几乎没有超调,调节时间明显缩短,过渡过程更加平稳,并且该控制器对被控对象参数变化有较好的性能鲁棒性。
A construction method for power system transient energy function is studied in the paper, which is simple and universal, and can unify the forms of some current en- ergy functions. A transient energy function including the induction motor model is derived using the method. The unintegrable term is dealt with to get an approxi- mate energy function. Simulations in a 3-bus system and in the WSCC 4-generator system verify the validity of the proposed energy function. The function can be applied to direct transient stability analysis of multi-machine large power systems and provides a tool for analysis of the interaction between the generator angle stability and the load voltage stability.
