基于PSASP的直流系统用户自定义建模

针对大规模交直流电力系统机电暂态仿真时采用程序缺省的直流输电模型不能有效描述实际直流输电特性的问题，以实际直流系统为参考，利用PSASP用户自定义建模环境，采用注入功率法建立高压直流用户自定义模型。此自定义直流模型由潮流模型和稳定模型2部分组成，稳定模型涵盖实际直流控制器的主要控制功能模型以及变压器分接头控制、无功控制等辅助功能模型。以EPRI-7节点系统为例，研究在不同工作状态下自定义直流模型系统的特性，仿真结果证明了模型的合理性。

Modeling of HVDC Based on the User-defined Model of PSASP

The default HVDC model used in software usually cannot describe some particular characteristics of an actual HVDC system in the electromechanical transient simulation of large-scale AC/DC power systems. According to the actual HVDC system, using the user-defined (UD) model circumstance provided by the power system analysis software package (PSASP) and adopting the injected power method, two HVDC models used for power flow and transient stability simulation are established. The transient stability UD model includes not only the most control function models of the actual system, but also the assistant function models such as tap changer control of transformers (TCC) and reactive power control (RPC). In order to analyze the characteristics of the UD HVDC model in different working conditions, the EPRI-7 nodes system is quoted as a calculation example with the correctness of the UD model proposed proved by the results of the simulation.