基于结构元理论的中压配电网接线模式

针对中压配电网规划问题，提出了一种新的接线模式分类和建模思想。首先，建立了系、族和结构元的3层分类结构体系：结构元由线路组成,以接线模式中电源点个数来表征，并定义经济性、负载率、网损、电压水平等评价接线模式的指标作为结构元的属性；根据线路和电源点的负载率，将结构元归类成若干族；根据接线结构和接线方式，将族归类成5个系。然后，建立了描述结构元属性的数学模型，包括：考虑设备负载率的结构元单位负荷投资的数学模型；负荷均匀分布的结构元线损属性的数学模型；结构元电压水平属性的数学模型。最后，通过一个选择接线模式的算例，验证了所提出的结构元方法的有效性。

Connection Modes in Medium-voltage Distribution Systems Based on Configuration-unit Theory

A new measure to categorize and model the connection modes in the planning of medium-voltage distribution systems is proposed. Firstly, the system is established consisting of "series", "tribe" and "configuration-unit". The configuration-unit composed of power lines is denoted by the amount of power sources, and its attributes are defined by such indexes of connection-modes as economic profit, load ratio, power loss and voltage level. The configuration-units are classified as a number of tribes as in terms of the load ratio, and the tribes as series in terms of connection configuration and means, respectively. Secondly, some models are established to characterize the attributes of a configuration-unit, which include the investment-per-load configuration-unit model with the load ratio taken into account, the loss rate in the uniform load configuration-units model and the voltage level configuration-units model. Finally, the effectiveness of the configuration-units measure is verified with an example of connection-modes selection.