基于观测器的多机系统气门开度的模糊H_∞控制新方法

New Observer-based Fuzzy H_∞ Control Approach for Steam Valve Opening of Multi-machine Power Systems

研究了汽轮发电机组成的多机电力系统气门开度的模糊观测H∞控制器设计问题.首先对多机电力系统建立T-S模糊模型,由于实际电力系统的状态有时不能作为模糊规则的前件变量,基于观测状态给出了多机电力系统具有H∞性能指标的条件,但它不是基于线性矩阵不等式(LMIs)的,只能通过两步法求解.因此又提出仅需一步就能求解的基于LMIs的条件,克服了两步法求解带来的保守性.最后采用局部线性化方法对两机无穷大母线的气门开度控制系统建立T-S模糊模型,并验证了控制方法的有效性.

The observer-based fuzzy H∞controller design problem was considered for steam valve opening of multi-machine power systems which is consisting of turbo-generators. Firstly,T-S fuzzy model was used to establish the model for multi-machine power systems. Because sometimes the measurable state variables of actual power systems may not be used as the premise variables of the fuzzy rules,the observer-based conditions were derived to guarantee the H∞performance.However,the conditions are not based on the linear matrix inequalities（ LMIs）,which can only be solved by a two-step method. Then the LMIs-based conditions by only one step were proposed,in which the conservativeness of the conditions was reduced. Finally,the T-S fuzzy model was established for the steam valve opening of two-machine infinite bus power systems with local linearization method,and effectiveness of the proposed controller design was verified by the simulation results.