一类多变量系统的自抗扰非线性动态解耦控制_苏思贤
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自抗扰技术在微电网下垂控制策略中的应用朱昊;韦钢;吴万禄;周昌林【摘要】For the traditional droop control strategy of the microgrid, it is difficult to adjust the control parameters of the strategy, and it is also affected by the grid voltage and load fluctuation greatly. To address the problem, this paper presents a droop control strategy of microgrid based on the technology of the ADRC, which can maintain the stable operationof microgrid under the islanded mode and the grid-connected mode. The structure of the ADRC has strong anti-interference ability, it can suppress the fluctuation of parameters and restrain the uncertain disturbance of the grid effectively, and the design method is also simple. The simulations reveal that the control strategy can maintain the balance of the power in microgrid effectively when the load is changing, keep the microgrid voltage and frequency constant, and play a supporting role in the microgrid.%针对传统微电网下垂控制策略中控制参数整定复杂,以及受电网电压、负荷波动影响较大等问题,提出一种基于自抗扰技术的微电网下垂控制策略。
第61卷 第8期 化 工 学 报 Vol161 No18 2010年8月 CIESC Journal August 2010研究论文基于ANFIS与多模型的一类非线性系统的自适应控制方法张亚军1,柴天佑2,富 月1(1东北大学流程工业综合自动化教育部重点实验室;2东北大学自动化研究中心,辽宁沈阳110004)摘要:针对一类不确定的离散时间零动态不稳定非线性系统,提出了一种基于自适应神经模糊推理系统(AN FIS)与多模型的非线性自适应控制方法。
该方法由线性鲁棒自适应控制器,基于AN FIS的非线性自适应控制器以及切换机制组成。
线性控制器用来保证闭环系统输入输出信号有界,非线性控制器用来改善系统性能。
切换机制通过对上述两种控制器的切换,保证闭环系统输入输出有界的同时,改善系统性能。
在采用ANFIS作为系统未建模动态补偿器时,首先用一个连续、单调、可逆的一一映射把可能无界的未建模动态的定义域转化成一个有界闭集,保证了AN FIS的万能逼近特性成立的前提条件。
而且,ANFIS能减小BP神经网络收敛速度慢和容易陷入局部极小的问题,改善了控制效果。
建立了保证系统稳定性的引理,并给出了闭环系统的稳定性和收敛性分析。
通过仿真比较,说明了所提方法的有效性。
关键词:非线性系统;不稳定零动态;ANFIS;多模型;切换中图分类号:TP273 文献标识码:A文章编号:0438-1157(2010)08-2084-08Adaptive control method for a cla ss of nonlinear systems based onANFIS and multiple modelsZH ANG Y ajun1,CH AI Tianyou2,FU Y ue1(1Key L aboratory of I nteg rated A utomation of Process I ndust ry,Minist ry of Education,N ortheastern Universit y, 2Research Center of A utomation,N ortheastern Universit y,S heny ang110004,L iaoning,China)Abstract:An adaptive cont rol met hod based on adaptive2network2based f uzzy inference system(AN FIS) and multiple models is propo sed for a class of uncertain discrete2time nonlinear systems wit h unstable zero2 dynamics1The met hod is composed of a linear robust adaptive cont roller,a nonlinear adaptive cont roller using AN FIS and a switching mechanism1The linear cont roller ensures t he boundedness of t he inp ut and outp ut signals,and t he nonlinear co nt roller imp roves performance of t he system1By using t he switching scheme,bot h imp roved performance and stability are achieved simultaneously1When t he AN FIS is used as a compensator for t he unmodelled dynamics,firstly,a continuous,monotonic and invertible one2to2one mapping is used in t his paper to t ransfer t he non2co mpact definition domain of t he unmodelled dynamics into a bounded clo sed set1As a result,t he universal app roximation property of AN FIS can be guaranteed1Furt hermore,t he AN FIS can successf ully tackle t he relatively low convergence rate of neural 2010-05-06收到初稿,2010-05-13收到修改稿。