海洋平台群电网静态电压稳定性评估

发布时间：2018-06-11 10:22

本文选题：海洋平台电网 + 多区域互联电网　；参考：《西南石油大学》2017年硕士论文

【摘要】：随着社会经济的不断发展,人们生活水平的不断提高,对电力和能源的需求与要求也越来越高,随之而来的资源短缺、环境污染等问题也日益严重。为了缓解和解决这些问题,"新能源革命"、"海洋工程"等项目应运而生。海洋平台电网作为"海洋工程"海上作业平台生产生活的电力支撑,其电能质量和电压稳定性关系着海上作业平台生产生活的正常运行。因此,有必要对海洋平台电网的电压稳定性进行分析研究。考虑海洋平台群电网与多区域互联电网的共同特性以及海洋这一特殊环境对海洋平台电网的影响,本文在多区域互联电网的基础上提出了基于考虑边界关联影响的改进REI等值法的电压稳定L指标协同计算方法。主要研究内容大致如下:(1)根据"分解-协调"的计算思想,以互联电网功率平衡方程为基础,明确区域电网间对彼此的边界关联影响,推导出考虑区域电网边界关联影响的基于区域电网局部数据的改进REI等值模型,使其能在一定程度上反映互联电网的动态特性。(2)采用变距线性回归分析的方法,根据区域电网的本地数据筛选有效的样本点集合,经过平移变换和时间加权回归,求取单边界节点情况下的改进REI等值方法的等值参数。根据边界节点间的电压无功灵敏度经验值,求取多边界节点情况下的改进REI等值方法的等值参数。(3)将求得的改进REI等值参数,代入到区域电网的基本节点信息中,得出新的节点导纳矩阵,推导L指标计算过程中使用到的负荷参与因子F矩阵的前后变化。将变化后的F矩阵带回L指标计算公式,得到对互联电网电压稳定评估的L指标协同计算方法。(4)选取标准IEEE14节点系统、IEEE118节点系统和某实际电网模型,编写潮流算例,仿真验证上述方法的正确性,并将该方法应用于渤海某地区实际海洋平台电网,初步评估该实际海洋平台电网的静态电压稳定性。(5)针对海洋平台电网的自身特殊性,考虑海底电缆电容效应对海洋平台电网的影响,通过对海底电缆部分参数的重新取值,修正对海洋平台电网的电压稳定性评估。通过对几个多区域互联电网和渤海某地区实际海洋平台电网的电压稳定性分析,仿真验证了本文提出的考虑边界关联影响的改进REI等值法的电压稳定L指标协同计算方法的正确有效性,且该方法只需要区域电网本地运行参数,降低了互联电网间的通信和计算负担。
[Abstract]:With the development of social economy and the improvement of people's living standard, the demand and demand for power and energy are more and more high, and the following problems such as shortage of resources and environmental pollution are becoming more and more serious. In order to alleviate and solve these problems, new energy revolution, ocean engineering and other projects came into being. As the power support of offshore platform production and life, the power quality and voltage stability of offshore platform are related to the normal operation of offshore platform. Therefore, it is necessary to analyze and study the voltage stability of offshore platform grid. Considering the common characteristics of offshore platform groups and multi-area interconnected networks and the impact of the special environment of the ocean on offshore platform grids, In this paper, an improved REI equivalent method based on the improved REI equivalent method is proposed to calculate the voltage stability L index on the basis of the multi-area interconnected power network. The main research contents are as follows: (1) according to the idea of "decomposition-coordination", based on the power balance equation of interconnected power grid, the influence of regional power grid on each other's boundary is clarified. An improved REI equivalent model based on local data of regional power network considering the influence of regional power network boundary correlation is derived, which can reflect the dynamic characteristics of interconnected power network to a certain extent. The method of variable distance linear regression analysis is adopted. According to the local data of the regional power network, the effective set of sample points is screened, and the equivalent parameters of the improved REI equivalence method under the condition of single boundary node are obtained by translation transformation and time-weighted regression. According to the experience value of voltage and reactive power sensitivity between boundary nodes, the equivalent parameters of the improved REI equivalence method in the case of multi-boundary nodes are calculated. The improved REI equivalent parameters are replaced into the basic node information of the regional power network. A new node admittance matrix is obtained and the change of the load participation factor F matrix used in the calculation of L index is deduced. The variable F matrix is brought back to the L index calculation formula, and the L index cooperative calculation method for voltage stability evaluation of interconnected power network is obtained. (4) the standard IEEE 14 bus system and a real power network model are selected, and a power flow calculation example is compiled. The simulation results verify the correctness of the above method, and apply the method to a practical offshore platform grid in Bohai Sea. The static voltage stability of the actual offshore platform grid is evaluated preliminarily. Considering the effect of submarine cable capacitance effect on offshore platform power network, the voltage stability evaluation of offshore platform network is modified by re-selecting some parameters of submarine cable. Based on the voltage stability analysis of several multi-area interconnected power networks and the actual offshore power grid in Bohai Sea, The simulation results show that the improved REI equivalent method proposed in this paper is correct and effective in calculating voltage stability L index, and the method only needs the local operation parameters of the regional power network. The communication and computing burden between the interconnected power grids is reduced.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P75;TM712

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