## Search found 4 matches

2 years ago
Forum: Modeling
Topic: Variable enters more than one =C= equation
Replies: 2
Views: 925

### Re: Variable enters more than one =C= equation

Hi Renger, Thanks for your response. I read this document carefully and realize that each decision variables is a member of at most one set in SOCP. Therefore, It seems that one decision variable can only be in one =C= equation. Do you think my model is a SOCP formulation? and how do I reformulate i...
2 years ago
Forum: Modeling
Topic: Variable enters more than one =C= equation
Replies: 2
Views: 925

### Variable enters more than one =C= equation

Hey all, I need your help. I develop a SOCP formulation for optimal power flow. However, The following error shows **** Variable enters more than one =C= equation X(i1) **** Variable enters more than one =C= equation X(i2) **** Variable enters more than one =C= equation X(i3) **** Variable enters mo...
3 years ago
Forum: Modeling
Topic: Global optimal solution for an MILP model
Replies: 1
Views: 1089

### Global optimal solution for an MILP model

I use CPLEX to solve an MILP model. If the relative gap is zero, can I say that the solution is a global optimal solution?
3 years ago
Forum: Modeling
Topic: An MIP formulation for MPEC can be solved with option optcr=0. However, the result appears not an optimal solution.
Replies: 1
Views: 967

### An MIP formulation for MPEC can be solved with option optcr=0. However, the result appears not an optimal solution.

Hello, I have developed an MIP formulation for MPEC as follows. It can be solved with option optcr=0. However, the result appears not an optimal solution. If we set Pb_h.fx(h) = 20, a better solution can be derived. It is strange. Would you please help me. Thank so much in advance sets d demand /1/,...