含VSC-MTDC的交直流混合电网潮流计算模型及稀疏性处理技术

Power flow calculation model and parse matrix disposal techniques for AC / DC hybrid power system with VSC-MTDC

介绍了电压源换流器的稳态等效模型及常见控制模式,给出了多端柔性直流与交流混合电网的潮流计算模型。针对电压源换流器模型导致的潮流雅可比矩阵非结构对称及零对角元问题,将少数非对角零元素处理为非零元素恢复了雅可比矩阵结构对称性,将控制量作为常量代入方程并对变量编号进行优先排序处理克服了零对角元问题,以极低的稀疏性代价解决了含电压源换流器的交直流混合电网潮流计算问题。对含舟山五端柔性直流的浙江电网某运行方式进行仿真,验证了所提模型的正确性及稀疏矩阵处理技术的有效性。

The steady-state equivalent model and common control modes of VSC（Voltage Source Converter）are introduced and the power flow calculation model of AC / DC hybrid power system with VSC-MTDC（VSCbased Multi-Terminal Direct Current） is proposed. Aiming at the structural asymmetry and zero diagonal element of Jacobi matrix caused by the VSC model,a few non-diagonal zero elements are treated as the non-zero elements to recover the structural asymmetry,and the control variables,being treated as constants in the equations,are numbered first to avoid zero diagonal element,which solves the power flow calculation problem of AC / DC hybrid power systems with very low sparsity cost. The simulation for an operating mode of Zhejiang Power System with Zhoushan five-terminal VSC-HVDC validates the correctness of the proposed model and the effectiveness of sparse matrix disposal techniques.