含大量电磁直流模型的机电–电磁暂态混合仿真技术研究

Electromechanical-electromagnetic Hybrid Simulation Technology With Large Number of Electromagnetic HVDC Models

伴随特高压直流的飞速发展和其输电容量阶跃式提升,我国电网呈现出"强直弱交"的特点。送受端、交直流、多直流之间耦合日趋紧密,电网运行特性日趋复杂。在大规模交直流电网的仿真分析中,直流输电系统需要采用电磁暂态仿真以获得准确动态特性,其余交流电网采用机电暂态仿真以提高仿真效率。然而,含多条直流电磁暂态模型的混合仿真在数据建立、方式调整及平稳启动方面存在困难,制约了大规模电网分析的工作效率和仿真精度。提供了通过直流标准化建模和数据映射拼接实现混合仿真数据自动建立的解决方案,提高了建模效率;提供了直流输电电磁模型运行方式自动调整、混合仿真接口电压箝位平稳启动的方法,使混合仿真能在0.6s的仿真过程内达到稳态。所提方法提高了大规模交直流电网机电–电磁混合仿真分析的工作效率和仿真精度。

With the rapid development of UHVDC and the step-by-step improvement of its transmission capacity, China’s power grid has the characteristics of "Strong HVDC and weak AC system". The coupling between the transmitting and receiving ends, AC and HVDC, and multiple HVDCs is getting closer and closer so that the operating characteristics of the power grid are becoming increasingly complex. In the simulation analysis of large-scale AC-DC power grids, the HVDC obtains accurate dynamic characteristics and the AC grids can improve its simulation efficiency via electromagnetic transient simulation. However, the hybrid simulation with multiple HVDC electromagnetic transient models has difficulties in data establishment, mode adjustment and smooth start, which restricts the working efficiency and simulation accuracy of large-scale power grid analysis. In this paper, a solution is presented for automatic establishment of hybrid simulation data through HVDC standardization modeling and data mapping splicing, which greatly improves the modeling efficiency. And a method is provided for automatically adjusting the operation mode of the HVDC electromagnetic model and the smooth start of the hybrid simulation so that the hybrid simulation can reach steady state within the simulation process of 0.6 s. The method proposed in this paper improves the working efficiency and simulation accuracy of electromechanical-electromagnetic.