一种电气距离计算新方法及其在无功分区中的应用

发布时间：2018-05-07 07:43

本文选题：电气距离 + 灵敏度　；参考：《华北电力大学(北京)》2017年硕士论文

【摘要】：当前我国经济快速发展,电力工业已经进入大机组、大电网、超高电压的发展时期。随着电网规模不断的扩大,系统结构更为复杂,用电、发电形式多样化,加之电力系统规划、建设的相对滞后,不确定性以及运行的不安全因素增加,导致电压稳定性的问题日益突出。电力系统无功/电压控制一直以来被认为是提高电力系统功率传输能力和电压稳定性的有效方法,其中电压分级控制是协调电力系统无功/电压控制的有效手段。电压分级控制的前提是无功分区,无功分区的数学基础是电气距离计算,传统电气距离的计算以灵敏度法为基础。该方法将潮流计算中雅克比矩阵经过求逆变换形成电压/无功灵敏度矩阵,从中选出代表电气联系的节点数据,用数学方法将这些节点进行合并划分,最终形成电网分区。由于复变电力系统的灵敏度计算方法,只满足可微性,不满足柯西-黎曼条件。因此,这种灵敏度计算方法是非解析的,从数学角度来说,不能用于描述复变电力系统的运行行为。即便不考虑数学严谨性,强行将灵敏度方法应用于复变电力系统的生产实践中,该方法也存在如下问题:解耦运算形式与电力系统参量耦合的矛盾;增量计算结果与电力系统运行方向不一致,导致计算失准。针对以上灵敏度法存在的问题,本文提出了一种电气距离计算新方法即复功率增量法。该方法在功率传输关系的基础上通过对线路注入与送出功率之间的解析关系求全微分,得出复功率增量,经数学方法证明,复功率增量计算方法是解析的,进而利用该方法计算电气距离。并针对IEEE39节点系统进行无功分区,对分区的结果进行分析评价并与灵敏度法计算结果相比较,验证所提方法的可行性、合理性与准确性。
[Abstract]:At present, with the rapid development of economy in China, the electric power industry has entered the development period of large units, large power grids and super high voltage. With the continuous expansion of the scale of the power network, the system structure is more complex, the power consumption, power generation forms are diversified, coupled with the power system planning, the construction of the relative lag, uncertainty and operational insecurity factors increase. The problem of voltage stability is becoming more and more serious. Reactive power / voltage control in power system has been regarded as an effective method to improve power transmission capacity and voltage stability. Voltage hierarchical control is an effective means to coordinate reactive power / voltage control in power system. The premise of voltage grading control is reactive power partition. The mathematical basis of reactive power partition is the calculation of electrical distance. The traditional calculation of electric distance is based on sensitivity method. In this method, the Jacobian matrix is inversely transformed into a voltage / reactive power sensitivity matrix in power flow calculation, from which the node data representing the electrical connection are selected, and these nodes are merged and partitioned by mathematical method. The sensitivity calculation method of complex power system only satisfies the differentiability and does not satisfy the Cauchy Riemann condition. Therefore, the sensitivity calculation method is non-analytical and can not be used to describe the operation behavior of complex power system from the point of view of mathematics. Even though the mathematical rigor is not considered, the sensitivity method is applied to the production practice of complex power system by force. The following problems still exist in this method: the contradiction between decoupling operation form and the coupling of power system parameters; The result of incremental calculation is inconsistent with the direction of power system operation, which leads to the misalignment of calculation. In order to solve the problems of the sensitivity method, a new method for calculating electrical distance, complex power increment method, is proposed. On the basis of the power transmission relation, the method obtains the total differential between the line injection and the output power, and obtains the complex power increment. It is proved by mathematical method that the calculation method of the complex power increment is analytical. Then the electrical distance is calculated by this method. According to the reactive power partition of IEEE39 node system, the results are analyzed and evaluated and compared with the results of sensitivity method to verify the feasibility, rationality and accuracy of the proposed method.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM712

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