负荷频率控制系统的鲁棒分析及抗扰设计

发布时间：2018-05-20 07:03

本文选题：负荷频率控制 + 鲁棒性　；参考：《华北电力大学(北京)》2017年博士论文

【摘要】：负荷频率控制是保证电力系统稳定运行的重要措施。随着电力系统网络复杂性的不断增加,特别是市场环境下解除管制后电力市场的发展,负荷频率控制鲁棒性能和抗扰性能显得更为重要。本文针对负荷频率控制系统的结构特性,提出分析分散负荷频率控制下系统稳定及鲁棒性分析方法,并提出采用自抗扰控制方案提高负荷频率控制系统的抗扰能力。主要研究内容包括:1.针对多区域负荷频率控制系统的结构特征,提出分散负荷频率控制下闭环系统稳定性分析方法,并将闭环系统鲁棒性分析分解成两部分:局域系统参数鲁棒性分析和联络线网络拓扑鲁棒性分析。该方案减小了系统鲁棒性分析的复杂性,可以揭示联络线网络拓扑对系统稳定性的影响,为互联电力系统网络建设提供参考。2.针对负荷频率控制系统的抗扰性能,提出采用自抗扰控制,利用自抗扰控制的在线扰动估计功能,提高系统抗扰能力。对负荷频率控制系统的自抗扰控制阶数及参数进行了分析,并对不同发电机组的电力系统提出参数整定方法。针对负荷频率控制系统存在的发电速率约束问题,提出了针对自抗扰控制结构的抗饱和补偿方案。仿真表明,自抗扰控制参数整定简单,性能强于普通PID控制器,在负荷频率控制中具有较大应用价值。3.分析了电力市场环境下的负荷频率控制系统结构,表明市场环境下合同负荷相当于在普通环境下增加了多处扰动,从而市场环境下负荷频率控制系统需要具有更强的抗扰性能。分析了电力市场环境下分散负荷频率控制系统的稳定性,结果表明:合同负荷并不能改变普通环境下系统的稳定性,因此市场环境下仍可以采用普通环境下的控制器设计方法,自抗扰控制是市场环境下负荷频率控制设计的有效手段。
[Abstract]:Load frequency control is an important measure to ensure the stable operation of power system. With the increasing complexity of power system network, especially the development of power market after deregulation, the robust performance and anti-disturbance performance of load frequency control become more and more important. According to the structural characteristics of the load frequency control system, this paper presents a method to analyze the stability and robustness of the system under the distributed load frequency control, and proposes to improve the anti-disturbance ability of the load frequency control system by using the auto disturbance rejection control scheme. The main research contents include: 1. In view of the structural characteristics of multi-area load frequency control system, a method for stability analysis of closed-loop system under decentralized load frequency control is proposed. The closed-loop system robustness analysis is divided into two parts: the local system parameter robustness analysis and the tie-line network topology robustness analysis. This scheme reduces the complexity of system robustness analysis and reveals the influence of tie-line network topology on system stability and provides a reference for the construction of interconnected power system network. Aiming at the disturbance rejection performance of load frequency control system, an active disturbance rejection control and on-line disturbance estimation function of automatic disturbance rejection control are proposed to improve the disturbance rejection ability of the system. In this paper, the order and parameters of active disturbance rejection control for load frequency control system are analyzed, and the method of parameter setting for power system of different generator sets is proposed. In order to solve the generation rate constraint problem of load frequency control system, an anti-saturation compensation scheme is proposed for the active disturbance rejection control (ADRC) structure. The simulation results show that the ADRC parameter setting is simple and the performance is better than that of the conventional PID controller. It has great application value in load frequency control. The structure of load frequency control system in power market environment is analyzed. It is shown that the contract load under the market environment is equivalent to adding multiple disturbances in the ordinary environment, so the load frequency control system in the market environment needs stronger immunity performance. The stability of decentralized load frequency control system in power market environment is analyzed. The results show that the contract load can not change the stability of the system under ordinary environment, so the controller design method in general environment can still be adopted in the market environment. Active disturbance rejection control (ADRC) is an effective method to design load frequency control in market environment.
【学位授予单位】：华北电力大学(北京)
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TM732;TP273

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