面向系统动态分析的场路网耦合时步有限元模型

Field-circuit-network Coupled Time-step Finite Element Model for Power System Dynamic Analysis

为了在分析系统扰动条件下机网相互影响问题时,能够更准确地考虑发电机的非线性,建立了适合不同网络结构、扰动类型以及不同计算任务的系统动态分析场-路-网耦合时步有限元通用性模型,进而详细推导了单机无穷大系统、两机系统以及三机系统的具体计算格式。在此基础上为使该模型适合更多的网络结构和不同任务的动态分析,引入了相应的控制变量,用于对方程本身、机网接口以及时步有限元计算参数进行控制与调整。模型与算法为深入研究动态过程机-网相互影响,并进一步获得发电机的简化模型提供了新的计算工具。

To accurately consider the nonlinear feature of synchronous generator in studying the interaction of the generators and power network under the condition of disturbance or faults, a field-circuit-network coupled time-stepping finite element （T-S FE） model for different types of network structure, disturbance and analysis problem was presented. Furthermore, the calculation expressions of three typical network structures, such as one machine infinite bus system, two machines system and three machines system were deduced in detail. For convenient usage of the model in different network structures and system analysis, this paper adopted some control variables to adjust the equations, machine-net interface as well as the T-S FE calculation parameters. The model and algorithm provide novel calculation method for researching the interaction of machine-net in dynamic process and the simplified model of the generators.