基于广域信息的大电网静态稳定态势评估

发布时间：2018-04-18 15:06

本文选题：电力系统 + 广域量测信息　；参考：《东北电力大学》2017年硕士论文

【摘要】：全球能源互联网战略的提出扩大了电网互联规模、加快了新能源并网步伐,电网安全稳定运行受到严重威胁。传统建模仿真方法受模型参数制约,其时效性无法满足电网安全防控需求。广域量测系统的发展给电网在线安全稳定评估带来机遇,可实现电网在线防控、实时评估、满足防控要求。因此,在广域环境下把握电网静态稳定机理,开展在线静态安全稳定评估研究,开发电网全景安全防御系统具有重要意义。本文首先探讨了电网静态稳定机理。对戴维南等值参数辨识方法进行了系统性归纳总结。分析了基于节点的戴维南等值和基于支路弹性映射的电网静态稳定机理,广域环境下,两者从本质上都可以归结为电网“源-网-荷”能量流动平衡性问题,进而阐述了电网静态稳定统一分析机理。针对现有方法时效性的不足,建立了电网广义并联结构模型。进而,将电网所有发电节点和负荷节点分别聚合为一个总的源点和荷点,构建了电网广义“源-网-荷”两节点系统。分别对等效系统发电功率、负荷功率、电流、电压相角进行求取。借鉴弹性映射思想将等效系统映射为两节点弹性支路,提出了一种基于“源-网-荷”等效和弹性映射的电网整体静态稳定快速评估方法。以IEEE 39节点系统为例对整体稳定性和各分区稳定性分别进行了计算,结果验证了所提方法的可行性。该方法与势能积分法相比计算量小,计算速度快,更适合在线应用。针对电网量化评估的不足,基于电网静态输电能力,在阻抗模指标基础上推导了具有等价意义的功率模指标。将电网广义“源-网-荷”等效系统与功率模指标结合,实现了大电网整体静态稳定态势的快速量化评估。两节点和IEEE 39节点系统仿真结果验证了所提方法的有效性和实用性。该方法避免了具有不确定因素的戴维南等效参数辨识环节,将电网静态稳定指标量化到0-1之间,满足了在线、量化评估电网安全稳定要求。研究了国内外电网可视化技术发展现状,提出了基于ECharts的电网Web可视化技术。详细分析了电网安全防御系统功能需求,对可视化框架进行了搭建。基于WAMS信息,利用大数据技术计算基于广义“源-网-荷”等效的电网静态稳定量化指标。开发了电网全景安全防御可视化系统,形象直观的展示了电网关键信息,实现了电网运行态势的实时监控,提高了电网安全防御能力。综上所述,本文基于电网实测或仿真信息,在戴维南等值参数辨识、大电网广义“源-网-荷”等效、电网整体静态稳定指标以及电网安全防御系统可视化等方面做了比较全面研究。提出了相应模型和方法,仿真算例效果较好。
[Abstract]:The global energy Internet strategy has expanded the scale of power grid interconnection, accelerated the pace of new energy grid connection, and seriously threatened the safe and stable operation of power grid.The traditional modeling and simulation method is restricted by the model parameters, and its timeliness can not meet the demand of power grid safety prevention and control.The development of wide-area measurement system brings opportunities for on-line security and stability evaluation of power grid. It can realize on-line prevention and control, real-time evaluation, and meet the requirements of prevention and control.Therefore, it is of great significance to grasp the mechanism of power grid static stability in wide area environment, to carry out the online static security and stability evaluation research and to develop the panoramic security defense system of power grid.In this paper, the mechanism of static stability of power system is discussed.Thevenin's equivalent parameter identification method is systematically summarized.The static stability mechanism of power grid based on node Davinan equivalence and branch elastic mapping is analyzed. In wide area environment, both of them can be attributed to the energy flow equilibrium problem of "source-net-load".Furthermore, the unified analysis mechanism of static stability of power grid is expounded.Aiming at the shortage of the existing methods, the generalized parallel structure model of power network is established.Furthermore, all generation nodes and load nodes are aggregated into a total source point and a load point respectively, and a generalized "source-net-load" two-node system is constructed.The generation power, load power, current and voltage phase angle of the equivalent system are calculated respectively.Based on the idea of elastic mapping, the equivalent system is mapped into a two-node elastic branch, and a fast static stability evaluation method based on "source-net-load" equivalence and elastic mapping is proposed.Taking the IEEE 39-bus system as an example, the global stability and the regional stability are calculated, and the results show that the proposed method is feasible.Compared with the potential energy integration method, this method is more suitable for online application.In view of the deficiency of the quantitative evaluation of the power network, the equivalent power module index is derived based on the impedance modulus index based on the static transmission capacity of the power network.By combining the generalized "source-net-load" equivalent system with the power module index, the rapid quantitative evaluation of the overall static stability situation of large power grid is realized.The effectiveness and practicability of the proposed method are verified by the simulation results of two nodes and IEEE 39 bus system.This method avoids the identification link of Davinan equivalent parameters with uncertain factors, quantifies the static stability index of power network to 0-1, and meets the requirements of on-line and quantitative evaluation of power grid security and stability.This paper studies the present situation of power grid visualization technology at home and abroad, and puts forward the grid Web visualization technology based on ECharts.The functional requirements of grid security defense system are analyzed in detail, and the visual framework is built.Based on WAMS information, big data technique is used to calculate the equivalent static stability quantization index of power grid based on generalized source-net-load.The visual system of panoramic security defense of power network is developed. The key information of power network is displayed visually and the real-time monitoring of power grid running situation is realized. The security defense capability of power grid is improved.To sum up, based on the measured or simulated information of power network, the equivalent parameter identification in Davinan, the generalized "source-net-load" equivalence of large power grid, is presented in this paper.The overall static stability index and the visualization of power grid security defense system are studied comprehensively.The corresponding model and method are put forward, and the simulation results are good.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM712

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