考虑时滞的电力系统阻尼控制器设计

发布时间：2018-11-13 13:57

【摘要】：低频振荡已成为影响电网稳定运行、制约电网传输能力的重要因素之一。广域测量系统的发展及应用使选择广域信号抑制区间模式成为可能,但是广域信号采集传输过程中的时滞因素不可忽略,同时广域控制器和本地控制器的相互作用会影响控制效果,二者如何协调一直是低频振荡控制的难点。因此,本文围绕考虑广域信号时滞的电力系统低频振荡阻尼控制器设计问题进行了研究,在建立时滞电力系统模型的基础上分析了时滞对电力系统可控可观的影响,还分析了控制器设计点时滞值的考虑对控制器效果的影响,并且在此基础上首先给出了控制环选择方法:选择对弱阻尼模式可控可观性大同时交互作用小的控制环,使得多控制器参数协调设计问题转化为各控制器独立设计问题,从而本地控制器和广域控制器可以独立设计;然后给出了控制器(主要是广域控制器)参数的独立设计方法:基于系统模型设计广域控制器参数,采用线性矩阵不等式设计目标函数,考虑控制器设计点时滞和放宽留数补偿法确定参数搜索范围,利用优化算法使时滞稳定极限最大,得到控制器最优参数;基于模型辨识给出可以追踪系统模型的广域控制器参数设计方法,采用两层结构实现系统模型追踪,采用模型预测算法设计适用于时滞系统的控制器参数。2区4机系统和新英格兰10机39节点是用到的测试系统。通过算例分析,验证了本文控制环选择方法的有效性和基于模型的控制器参数设计方法对时滞的适应性和基于模型辨识的控制器设计方法对时滞和系统模型变化的适应性。
[Abstract]:Low frequency oscillation has become one of the important factors that affect the stable operation of power grid and restrict the transmission capacity of power network. The development and application of wide area measurement system make it possible to select wide area signal suppression interval mode, but the delay factors in wide area signal acquisition and transmission can not be ignored. At the same time, the interaction between wide area controller and local controller will affect the control effect. How to coordinate them is always the difficulty of low frequency oscillation control. Therefore, the design of low-frequency oscillation damping controller for power system with wide-area signal delay is studied in this paper. Based on the model of time-delay power system, the influence of time-delay on controllable observability of power system is analyzed. The effect of time delay on the controller effect is also analyzed. On the basis of this, the control loop selection method is presented: the control loop with large controllable observability and little interaction is selected. The multi-controller parameter coordination design problem is transformed into the independent design problem of each controller, so that the local controller and the wide-area controller can be designed independently. Then, the independent design method of controller parameters (mainly wide-area controller) is given. The parameters of wide-area controller are designed based on system model, and the objective function is designed by linear matrix inequality (LMI). Considering the time delay of controller design point and the relaxation of residue compensation method to determine the parameter search range, the optimal parameters of the controller are obtained by using the optimization algorithm to maximize the stability limit of the time delay. Based on the model identification, a wide area controller parameter design method is presented, which can track the system model. The two-layer structure is used to realize the system model tracking. The model prediction algorithm is used to design the controller parameters for time-delay systems. The 2-block 4-machine system and the New England 10-machine 39-bus test system are used. The validity of the control loop selection method and the adaptability of the model-based controller parameter design method to the time-delay and the model-based controller design method to the time-delay and the system model variation are verified by an example.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM712

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