专家系统的方法处理约束不满足问题，并求得可行解。如果可行解与最优解相差太远，即再用神经网络对解的质量进行精化，最后得到机组组合的最优解。但此方法存在样本集的组合爆炸问题，难以求解大规模的问题。专家系统与模糊集理论结合的应用研究也较多。文献[31,32]首次提出了采用专家系统技术、模糊集理论和动态规划技术的长期发电规划的新方法。利用规划工程师多年积累的经验和知识以及规划阶段必须满足的一些约束，在动态规划的每一个决策阶段限制状态转移路径数目，力图解决动态规划问题的“维数灾”的问题。文献[32]详细介绍了用模糊集理论描述规划问题中很多定性指标，并讨论了其与专家系统、数学优化技术的结合方式，最后给出了一个分四个规划阶段、规划期为二十年的中等规模的发电扩展规则的例子，阐明了所提技术的有效性。文献[33]描述能支持火电厂操作人员制定最佳起动方案并将其准确执行的专家系统。汽轮机的最佳升速和增负荷方式是通过迭代法而获得，后者则基于采用发电厂动态模型定量计算和对方案模糊优化规则的定性了解的模糊推理。这些规则反映出应力域和方案参数变化率之间的关系。仿真分析证明，该专家系统能为快速而准确的发电厂起动创造条件。
综合智能控制应用于电力系统的研究才刚刚起步，随着人们对各种智能控制理论研究的进一步深入，它们之间的联系也会更加紧密，相信利用各自优势而组成的综合智能控制系统会对电力系统起到更加重要的作用。
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The Application of Modern Control Techniques in
Power System Control(Ⅱ)
Wu Jie Chen Wei Liu Yongqiang
(Electric Power College South China University of
Technology Guangzhou 510641 China)
Abstract The main achievements of neural network,fuzzy logic,expert system,and synthesis intelligent control used in the control of power system stability,excitation and speed control system,static VAR compensation,stability control of generator,security assessment and transient stability control of multi-machine system are surveyed in this paper,and certain problems to be solved are proposed simultaneously.
Key Words power system automatic control intelligent control
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