Update DC-OPF with correct PU and additional flow limit constraints

src/load_inputs/load_network_data.jl

@@ -42,6 +42,13 @@ function load_network_data!(setup::Dict, path::AbstractString, inputs_nw::Dict)
             setup["NetworkExpansion"] = 0
         end
         println("Reading DC-OPF values...")
+        #Adding the base quantities
+        # Base voltage (in kV)
+        line_voltage_kV_Base = to_floats(:Line_Voltage_kV_Base)
+        # MVA_Base (in MVA)
+        MVA_Base = to_floats(:MVA_Base)
+        # Base reactance
+        line_reactance_Ohms_Base = (line_voltage_kV .^ 2) ./ MVA_Base
         # Transmission line voltage (in kV)
         line_voltage_kV = to_floats(:Line_Voltage_kV)
         # Transmission line reactance (in Ohms)
@@ -52,6 +59,8 @@ function load_network_data!(setup::Dict, path::AbstractString, inputs_nw::Dict)
         # MW = (kV)^2/Ohms 
         inputs_nw["pDC_OPF_coeff"] = ((line_voltage_kV .^ 2) ./ line_reactance_Ohms) /
                                      scale_factor
+        #Reactance in pu
+        inputs_nw["pu_reactance"] = line_reactance_Ohms ./ line_reactance_Ohms_Base
     end
 
     # Maximum possible flow after reinforcement for use in linear segments of piecewise approximation

src/model/core/transmission/dcopf_transmission.jl

@@ -40,8 +40,16 @@ function dcopf_transmission!(EP::Model, inputs::Dict, setup::Dict)
     @constraint(EP,
         cPOWER_FLOW_OPF[l = 1:L, t = 1:T],
         EP[:vFLOW][l,
-            t]==inputs["pDC_OPF_coeff"][l] *
+            t]==(1/inputs["pu_reactance"][l]) *
                 sum(inputs["pNet_Map"][l, z] * vANGLE[z, t] for z in 1:Z))
+
+
+    # Maximum power flows, power flow on each transmission line cannot exceed maximum capacity of the line at any hour "t"
+    @constraints(EP,
+        begin
+            cMaxFlow_out[l = 1:L, t = 1:T], vFLOW[l, t] <= EP[:eAvail_Trans_Cap][l]
+            cMaxFlow_in[l = 1:L, t = 1:T], vFLOW[l, t] >= -EP[:eAvail_Trans_Cap][l]
+        end)
 
     # Bus angle limits (except slack bus)
     @constraints(EP,