摘要
提出了基于模块化多电平换流器的高压直流电网机电暂态仿真模型。阐述了模块化多电平换流器交流侧等效模型及其控制系统模型,介绍了基于能量等效原则的换流器直流侧等效电容的计算方法。建立了基于隐式梯形积分的直流网络计算模型,能够处理含有中间连接点的任意结构的直流网络。提出了包括直流侧故障在内的4种形式的故障处理方法。在四端直流电网系统中,通过与电磁暂态模型的对比,验证了所提模型及故障处理方法的仿真准确性。
An electromechanical transient model of HVDC grids based on modular multilevel converter（MMC） is proposed. Equivalent circuit and MMC controller is described. Calculation method for equivalent DC capacitance is presented based on energy equivalence principle. A DC network model based on implicit trapezoidal integration is built, able to deal with random structured DC network with intermediate connection node. Several events of MMC failures, including DC side fault, and dealing methods are discussed. Finally, simulations of the proposed model are compared with an electromagnetic model consisted of 31-level MMC in a four-terminal grid. The model and its control strategy is validated.
出处
《电网技术》
EI
CSCD
北大核心
2017年第7期2085-2091,共7页
Power System Technology
基金
国家电网公司科技项目(XT71-15-048)~~
