计及风电接入的大规模电力系统广域阻尼控制研究

发布时间：2018-01-06 18:48

本文关键词：计及风电接入的大规模电力系统广域阻尼控制研究　出处：《武汉大学》2014年博士论文　论文类型：学位论文

【摘要】：随着我国大规模新能源的集中开发利用和特高压电网互联走廊建设的快速推进,互联电力系统规模和动态特性的复杂度变得越来越大,大电网中的各类不确定因素对互联电力系统同步稳定运行的影响不断增大,仅仅依靠基于本地信号的局域控制器越来越难以抑制互联电力系统中的区间低频振荡现象。广域测量系统的发展为互联电力系统动态稳定分析和网源协调阻尼控制技术研究提供了有力的物质保障,但是由于大型互联电力系统分布广泛,广域信号在传输信道中不可避免地存在延时情况,因此采用广域信号进行附加阻尼控制的同时,有必要考虑到广域信号时变时滞效应的影响。本文以广域电力系统时滞相关稳定性分析为基础,探索新思想、新理论和新方法,重点研究广域阻尼控制措施对于改善互联电力系统动态特性的作用和网源协调控制技术,论文的内容主要有以下几个部分：第一部分基于大规模互联电力系统广域阻尼控制架构,提出了一种计及广域信号时变时滞特性的时滞电力系统模型,这一模型是后续章节进行时滞相关稳定分析与阻尼控制的模型基础；提出了一种基于LMI技术的电力系统模型降阶方法,该方法加强了降阶模型在低频率范围内与全阶模型的一致性,相比传统方法具有更好的逼近性能,这一降阶方法是后续章节进行阻尼控制器设计的模型降阶基础。第二部分基于综合方法提出了一种电力系统最大时滞稳定上界计算方法,该方法克服了传统方法中存在大量决策变量和计算效率偏低的问题,在不增加稳定准则保守性的基础上,运用Jensen积分不等式推导出了一种决策变量更少且计算效率更高的稳定准则；同时根据最大时滞稳定上界与系统不稳定极点之间的关系,提出了确定时滞初始值的方法,进一步降低迭代次数和计算量,仿真算例表明所提方法具备良好的适用性和实际运用潜力。第三部分分析了风电占比逐渐增大对于互联电力系统阻尼特性的影响,在此基础上分别提出了基于无功补偿型设备的风电场侧广域控制策略和基于附加励磁控制的电网侧相关同步机组广域控制策略,进而综合得出含风电的电力系统广域时滞鲁棒协调控制思想。结合自由权矩阵方法和状态观测理论获得了一种新的广域时滞阻尼控制器设计方法,该方法在设计广域控制器的同时,还能够通过迭代算法方便获得广域电力系统最大时滞稳定上界。第四部分建立了一种计及反馈信号时变时滞特性和外部随机扰动影响的时滞电力系统模型,提出了闭环时滞电力系统鲁棒性能指标和时滞相关鲁棒稳定准则,利用二分搜索技术能够方便计算得到最小鲁棒性能指标；结合改进锥形互补算法和二分搜索技术给出了满足最小鲁棒性能指标要求的时滞相关鲁棒阻尼控制器设计方法,仿真算例表明,所提方法既能提高闭环时滞电力系统的动态稳定性,又能充分保证闭环系统对于外部随机扰动的最佳抑制能力。
[Abstract]:With the development and utilization of large - scale new energy in China and the rapid advance of the construction of extra - high voltage power grid interconnection corridor , the complexity of interconnected power system ' s scale and dynamic characteristics becomes more and more important . The development of wide - area measurement system is more and more difficult to suppress inter - section low - frequency oscillation in interconnected power system . Based on the analysis of delay - dependent stability of wide - area power system , this paper explores new ideas , new theories and new methods , and focuses on the effect of wide - area damping control measures on improving the dynamic characteristics of interconnected power systems and network - source coordination control technology . The contents of the paper are as follows : In the first part , based on the wide - range damping control architecture of large scale interconnected power system , a time - delay power system model with time - varying delay characteristic of wide - area signal is presented . This model is a model base of time - delay dependent stability analysis and damping control in subsequent sections . In the second part , based on the comprehensive method , a method for calculating the maximum time - delay stable upper bound of power system is presented , which overcomes the problem of low decision - making variables and low computational efficiency in traditional methods . In the third part , the influence of wind power ratio increasing on damping characteristics of interconnected power system is analyzed . Based on this , a wide area control strategy based on reactive power compensation equipment and a wide area control strategy based on additional excitation control are proposed . In the fourth part , a time - delay power system model with time - varying delay characteristic and external random disturbance is established . The robust performance index and time - delay - related robust stability criterion of closed - loop time - delay power system are proposed . The design method of delay - related robust damping controller which meets the requirement of minimum robustness can be calculated conveniently by using the improved tapered complementary algorithm and the binary search technique . The simulation example shows that the proposed method can improve the dynamic stability of the closed - loop time - delay power system and fully guarantee the optimal suppression capability of the closed - loop system for external random disturbance .

【学位授予单位】：武汉大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM614

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