RT-BOX模型简化，采用等效电路原则，需要注意的事项：sample time需要设为BOX的采样执行时间，否则会报错：
Inconsistent source
- Split_March_10_v4/Plant/VSI1/Sub-cycle average/HBa/Sub-cycle average/i_dc
- Split_March_10_v4/Plant/VSI1/Sub-cycle average/HBb/Sub-cycle average/i_dc
- Split_March_10_v4/Plant/VSI1/Sub-cycle average/HBc/Sub-cycle average/i_dc
- Split_March_10_v4/Plant/DC split/I
