基于BPA的大规模电力系统工程应用的同调动态等值方法

Homogenous Dynamic Equivalent Method for Large-scale Power System Engineering Application Based on BPA

使用PSCAD/EMTDC软件对实际大规模交直流混联电力系统进行电磁暂态建模仿真分析时,为兼顾仿真效率和交直流间相互影响,需先对交流系统进行等值简化,通过计算节点残压来扩充边界节点集形成边界缓冲层减小等值前后的误差,并利用核心机组来求解外部系统等值发电机的暂态参数减小求解工作量,最后以华东电网为例,比较等值前后系统的静态潮流和暂态稳定情况。结果表明,基于BPA的实际工程应用的同调动态等值方法在保证工程精度的前提下,减少等值难度,具有一定的应用价值。

When PSCAD/EMTDC software is used to simulate electromagnetic transient state of large-scale AC/DC hybrid power system,the AC system must be equidistantly simplified for considering simulation efficiency and mutual influence between AC and DC.In order to reduce the error before and after the equal value,the boundary node set is expanded by calculating the residual voltage of the node to form the boundary buffer layer.And then the central unit is used to solve the transient parameters of the external system equivalent generator to reduce the solution workload.Taking the East China Power Grid as an example,the correctness and feasibility of the proposed method is verified by comparing the static power flow and transient stability of the system before and after the equivalence.The results show that the homogenous dynamic equivalent method based BPA for practical engineering application can reduce the difficulty of equal value on the premise of ensuring the engineering accuracy,and has certain application value.