【摘要】 针对多馈入直流大规模电网,提出了实现一种新的机电—电磁混合仿真方法。在网络划分中,将多条直流进行解耦处理,形成单个交流机电网络与多个直流电磁子网的混合仿真计算;在直流电磁仿真中,对换流器进行不同工况划分和等值处理,并与直流线路构成统一的拓扑结构和简单网络,避免了含开关复杂网络的求解;在接口处理中,采用傅里叶变换提取电磁侧接口基波电流,参与机电侧网络的迭代计算,以保证数值稳定;另外,采用适时控制步长的方法,解决交直流大电网仿真可能出现的不收敛问题;最后,将混合仿真的结果与机电暂态仿真程序PSASP进行比较,分析多馈入直流同时换向失败的现象。更多还原

【Abstract】 For the multi-infeed DC large-scale power grid, a new electromechanical-electromagnetic hybrid simulation approach was developed. In terms of the network partitioning, a plurality of DC systems were decoupled to form a single AC electromechanical network and a plurality of DC electromagnetic subnets. In terms of the DC electromagnetic simulation, the inverter was divided into different working conditions. The equivalent circuit was connected to the DC line and a unified and simple topology was formed. The method avoided the calculation of complicated network with switches. In terms of the interface solution, the current of the electromagnetic side was extracted for the iterative solution of the electromechanical network, which could ensure the numerical stability. The step-size control strategy was utilized in some time-steps to solve the non-convergence problem of large-scale power grid. Finally, the results of hybrid simulation were compared with PSASP, and the problem of multi-infeed DC commutation failure was analyzed.更多还原