论坛里的各位同行朋友，你们好！我在用Saber仿三相逆变电路时，出现直流工作点仿真不通过的问题，请大家帮忙看看问题在哪里，希望不吝赐教！谢谢！
出现如下问题！
thm failed. Trying the gmin_ramping algorithm.
The gmin_ramping algorithm failed. Trying the static_ramping algorithm.
The static_ramping algorithm failed. Trying the den_ramping algorithm.
Automatic algorithm selection exhausted
*** ERROR "ALG_SINGULAR_JACOBIAN" *** Singular Jacobian matrix.
Some possible causes for a singular Jacobian matrix:
- Model operating outside of its intended region of operation.
- Node/subsystem with no connection to the reference (floating).
- Current loops (voltage sources/inductors in parallel).
- Missing equation and/or missing variable reference.
Potential problem variables/equations:
/iam(ide_d2an.inv_l4_1_out)
