江西地区将建成多条特高压输电线路，特高压链式静止同步补偿器（STATCOM）是其无功补偿的首选设备。高电压设备的科学研究依赖于数学仿真，但是此类仿真速度极慢。本项目围绕着在不同时间尺度下的计算精度和仿真速度问题，利用多时间尺度降阶来展开等效建模理论研究：①根据开关暂态、电磁暂态特性和导纳矩阵特点，对正常运行和故障旁路时的换流链模型展开状态分群和化简，构建换流链多时间尺度等效模型；②针对机电暂态和电磁暂态的特征，化简分层控制系统并实现各种控制的优化，研究与特高压交直流系统配合的各类分层控制系统的等效建模；③按照不同控制目标下的速度与精度指标，实现多时间尺度高速数据交互，探寻特高压链式STATCOM数值仿真的误差分析技术；④开发一套特高压链式STATCOM的多时间尺度等效模型库，通过实验验证其在各种控制目标下的计算精度和仿真速度。

Jiangxi will build several EHV transmission lines, and EHV cascaded STATCOM is a preferred equipment for reactive power compensation in the lines. Scientific research of high-voltage equipment relies on mathematical simulation, but such simulations are extremely slow. Revolving the topic of the computational accuracy and simulation speed under different time scales，This project start the equivalent modeling theory research with the reduced order modeling theory: ①According to the characteristics of switch transient, electromagnetic transient and admittance matrix, the convert chain model in normal operation and fault bypass is grouped and simplified to construct the multi-time scale equivalent model of converter chain; ② Involving the characteristics of electromechanical transient and electromagnetic transient, this project simplifies the hierarchical control system and achieve several types of control optimization; ③On the basis of the different operating conditions of speed and accuracy, this project focus on Error Analysis Technology to achieves multi-time scale data exchange in a higher speed. ④ A multi-time-scale equivalent model library of EHV cascaded STATCOM was developed and its calculation accuracy and simulation speed under various control targets were verified through experiments.