基于二阶非均匀Kuramoto模型的电力系统暂态稳定分析
发布时间：2018-08-20 17:23
【摘要】：新能源接入电网后，使得电力系统的暂态问题变得更加突出，为了确保电网的安全运行，必须迅速对受扰后系统的暂态稳定情况做出判断。近年来，学者们开始注意到了Kuramoto模型频率同步与电力系统暂态稳定的相似性。最近的二阶非均匀Kuramoto模型频率同步研究成果可通过二阶非均匀Kuramoto模型基础图的参数与状态来体现系统频率同步点的吸引域，这恰好解决了直接法中难以估计受扰后系统稳定平衡点吸引域的困难。 本文通过建立二阶非均匀Kuramoto模型与网络收缩电力系统模型间的对应关系，将二阶非均匀Kuramoto模型频率同步理论融入暂态稳定分析，导出了基于二阶非均匀Kuramoto模型的暂态稳定判据。只需比较扰动消除瞬间系统初始状态变量的一维映射值与稳定平衡点吸引域的一维映射值间的大小关系，即可对扰动消除后系统的暂态稳定性做出判别。在此基础上，提出一种基于二阶非均匀Kuramoto模型的暂态稳定分析方法。 对于电力系统内发生故障时的情况，从2机3节点系统、WSCC3机9节点系统、CIGRE7机10节点系统以及IEEE6机30节点系统的算例分析结果可以看出，基于二阶非均匀Kuramoto模型的故障极限切除时间算法形式简洁、计算快速，不仅能对电力系统受扰后的暂态稳定情况进行判断，还能给出不同故障切除时间下受扰系统的稳定裕度，具有较高的工程实用价值。 对于电力系统内节点功率发生扰动时的情况，从CIGRE7机10节点系统的算例分析中可以看出，基于二阶非均匀Kuramoto模型的扰动最大持续时间估计方法可根据作用于系统功率扰动的幅值快速估计出在该扰动作用下为保证系统不失稳所允许的扰动最大持续时间。虽然该方法目前所得结果较为保守，但却有很明确的改进方向，一旦方法的保守性得以改善，，就可为电网的安全运行提供有利保障。 本文工作得到国家重点研究发展计划（973计划）《智能电网中大规模新能源电力安全高效利用基础研究》（课题一：新能源电力系统动力学特性及建模理论）（2012CB215201）以及国家高技术研究发展计划（863计划）重大项目《高渗透率间歇性能源的区域电网关键技术研究和示范》（2011AA05A105）的资助。
[Abstract]:After the new energy is connected to the power network, the transient problem of the power system becomes more prominent. In order to ensure the safe operation of the power network, it is necessary to judge the transient stability of the power system after the disturbance quickly. In recent years, scholars have begun to pay attention to the similarity between frequency synchronization of Kuramoto model and transient stability of power system. The recent research results of frequency synchronization of second-order non-uniform Kuramoto model can reflect the attraction region of frequency synchronization point by the parameters and states of the basic diagram of second-order non-uniform Kuramoto model. This solves the difficulty of estimating the attractive region of the stable equilibrium point in the direct method. In this paper, by establishing the corresponding relation between the second-order nonuniform Kuramoto model and the network shrinking power system model, the frequency synchronization theory of the second-order non-uniform Kuramoto model is incorporated into the transient stability analysis, and the transient stability criterion based on the second-order non-uniform Kuramoto model is derived. It is only necessary to compare the size relationship between the one-dimensional mapping value of the initial state variable and the one-dimensional mapping value of the attraction region of the stable equilibrium point, and then to judge the transient stability of the system after the disturbance cancellation. On this basis, a transient stability analysis method based on second order nonuniform Kuramoto model is proposed. For the situation of power system failure, it can be seen from the example analysis of the 10-bus system of CIGRE7 and the 30-bus system of IEEE6 machine, which is a 9-bus system of WSCC3 machine and a 3-bus system of a two-machine three-bus system. Based on the second-order nonuniform Kuramoto model, the fault limit cutting time algorithm is simple and fast. It can not only judge the transient stability of the power system after being disturbed, but also give the stability margin of the disturbed system under different fault removal times. It has high engineering practical value. In the case of power system node power disturbance, it can be seen from the example analysis of CIGRE7 machine 10-bus system. Based on the second-order nonuniform Kuramoto model, the maximum duration of the disturbance can be estimated quickly based on the amplitude of the disturbance acting on the power disturbance of the system, and the maximum duration of the disturbance under the disturbance can be quickly estimated to ensure the stability of the system. Although the results obtained by this method are conservative at present, there is a clear direction for improvement. Once the conservatism of the method is improved, it can provide a favorable guarantee for the safe operation of the power grid. The National key Research and Development Plan (973 Plan) "basic Research on the safe and efficient Utilization of Large-Scale New Energy and Electric Power in Smart Grid" (topic 1: dynamic characteristics and Modeling Theory of New Energy Power system) (2012CB215201) and the country High Technology Research and Development Program (Project 863) funded by a major project, "Research and demonstration of key Technologies in Regional Power grids with High permeability intermittent Energy" (2011AA05A105).
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM712
本文编号：2194412
[Abstract]:After the new energy is connected to the power network, the transient problem of the power system becomes more prominent. In order to ensure the safe operation of the power network, it is necessary to judge the transient stability of the power system after the disturbance quickly. In recent years, scholars have begun to pay attention to the similarity between frequency synchronization of Kuramoto model and transient stability of power system. The recent research results of frequency synchronization of second-order non-uniform Kuramoto model can reflect the attraction region of frequency synchronization point by the parameters and states of the basic diagram of second-order non-uniform Kuramoto model. This solves the difficulty of estimating the attractive region of the stable equilibrium point in the direct method. In this paper, by establishing the corresponding relation between the second-order nonuniform Kuramoto model and the network shrinking power system model, the frequency synchronization theory of the second-order non-uniform Kuramoto model is incorporated into the transient stability analysis, and the transient stability criterion based on the second-order non-uniform Kuramoto model is derived. It is only necessary to compare the size relationship between the one-dimensional mapping value of the initial state variable and the one-dimensional mapping value of the attraction region of the stable equilibrium point, and then to judge the transient stability of the system after the disturbance cancellation. On this basis, a transient stability analysis method based on second order nonuniform Kuramoto model is proposed. For the situation of power system failure, it can be seen from the example analysis of the 10-bus system of CIGRE7 and the 30-bus system of IEEE6 machine, which is a 9-bus system of WSCC3 machine and a 3-bus system of a two-machine three-bus system. Based on the second-order nonuniform Kuramoto model, the fault limit cutting time algorithm is simple and fast. It can not only judge the transient stability of the power system after being disturbed, but also give the stability margin of the disturbed system under different fault removal times. It has high engineering practical value. In the case of power system node power disturbance, it can be seen from the example analysis of CIGRE7 machine 10-bus system. Based on the second-order nonuniform Kuramoto model, the maximum duration of the disturbance can be estimated quickly based on the amplitude of the disturbance acting on the power disturbance of the system, and the maximum duration of the disturbance under the disturbance can be quickly estimated to ensure the stability of the system. Although the results obtained by this method are conservative at present, there is a clear direction for improvement. Once the conservatism of the method is improved, it can provide a favorable guarantee for the safe operation of the power grid. The National key Research and Development Plan (973 Plan) "basic Research on the safe and efficient Utilization of Large-Scale New Energy and Electric Power in Smart Grid" (topic 1: dynamic characteristics and Modeling Theory of New Energy Power system) (2012CB215201) and the country High Technology Research and Development Program (Project 863) funded by a major project, "Research and demonstration of key Technologies in Regional Power grids with High permeability intermittent Energy" (2011AA05A105).
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM712
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相关期刊论文 前3条
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