Merge pull request #527 from suavecode/feature-battery_charge

fixed battery for solar UAV

regression/scripts/solar_network/solar_network.py

@@ -77,7 +77,7 @@ def main():
     truth_F   = 105.36115293829462
     truth_rpm = 218.18739964349612
     truth_i   = 130.17994767726535
-    truth_bat = 548777403.1018918
+    truth_bat = 136537368.1714456
 
     print('battery energy')
     print(energy)

trunk/SUAVE/Components/Energy/Networks/Battery_Cell_Cycler.py

@@ -225,7 +225,7 @@ def add_unknowns_and_residuals_to_segment(self, segment, initial_voltage = None,
         battery  = self.battery  
 
         # Assign initial segment conditions to segment if missing 
-        append_initial_battery_conditions(segment)     
+        append_initial_battery_conditions(segment,battery)          
 
         segment.state.residuals.network = Residuals()
 

trunk/SUAVE/Components/Energy/Networks/Battery_Propeller.py

@@ -412,11 +412,11 @@ def add_unknowns_and_residuals_to_segment(self, segment, initial_voltage = None,
             n_props = 1   
 
         # Assign initial segment conditions to segment if missing
-        append_initial_battery_conditions(segment)      
+        battery = self.battery
+        append_initial_battery_conditions(segment,battery)          
 
         # add unknowns and residuals specific to battery cell 
         segment.state.residuals.network = Residuals()  
-        battery = self.battery
         battery.append_battery_unknowns_and_residuals_to_segment(segment,initial_voltage,
                                               initial_battery_cell_temperature , initial_battery_state_of_charge,
                                               initial_battery_cell_current)  

trunk/SUAVE/Components/Energy/Networks/Lift_Cruise.py

@@ -730,11 +730,11 @@ def add_transition_unknowns_and_residuals_to_segment(self, segment, initial_volt
             self.number_of_lift_rotor_engines = int(self.number_of_lift_rotor_engines)
 
         # Assign initial segment conditions to segment if missing
-        append_initial_battery_conditions(segment)       
+        battery = self.battery
+        append_initial_battery_conditions(segment,battery)               
 
         # add unknowns and residuals specific to battery cell
         segment.state.residuals.network = Residuals()
-        battery = self.battery
         battery.append_battery_unknowns_and_residuals_to_segment(segment,initial_voltage, initial_battery_cell_temperature ,
                                                                            initial_battery_state_of_charge, initial_battery_cell_current)   
         if segment.battery_discharge: 
@@ -824,11 +824,11 @@ def add_cruise_unknowns_and_residuals_to_segment(self, segment, initial_voltage
             self.number_of_lift_rotor_engines = int(self.number_of_lift_rotor_engines)  
 
         # Assign initial segment conditions to segment if missing  
-        append_initial_battery_conditions(segment)           
+        battery = self.battery
+        append_initial_battery_conditions(segment,battery)          
 
         # add unknowns and residuals specific to to battery cell
         segment.state.residuals.network = Residuals()
-        battery = self.battery
         battery.append_battery_unknowns_and_residuals_to_segment(segment,initial_voltage, initial_battery_cell_temperature ,
                                                                            initial_battery_state_of_charge, initial_battery_cell_current)   
         if segment.battery_discharge: 
@@ -920,11 +920,11 @@ def add_lift_unknowns_and_residuals_to_segment(self, segment, initial_voltage =
             self.number_of_lift_rotor_engines = int(self.number_of_lift_rotor_engines)
 
         # Assign initial segment conditions to segment if missing  
-        append_initial_battery_conditions(segment)     
+        battery = self.battery
+        append_initial_battery_conditions(segment,battery)          
 
         # add unknowns and residuals specific to battery cell
         segment.state.residuals.network = Residuals()
-        battery = self.battery
         battery.append_battery_unknowns_and_residuals_to_segment(segment,initial_voltage, initial_battery_cell_temperature ,
                                                                            initial_battery_state_of_charge, initial_battery_cell_current)   
         if segment.battery_discharge: 

trunk/SUAVE/Components/Energy/Networks/Solar.py

@@ -116,7 +116,6 @@ def evaluate_thrust(self,state):
         # Unpack conditions
         a = conditions.freestream.speed_of_sound        
 
-
         # Set battery energy
         battery.current_energy           = conditions.propulsion.battery_energy
         battery.pack_temperature         = conditions.propulsion.battery_pack_temperature
@@ -188,7 +187,7 @@ def evaluate_thrust(self,state):
             F[eta[:,0]>1.0,:] = F[eta[:,0]>1.0,:]*eta[eta[:,0]>1.0,:]
 
             # Run the motor for current
-            motor.current(conditions)            
+            _ , etam =  motor.current(conditions)         
 
             # Conditions specific to this instantation of motor and propellers
             R                   = prop.tip_radius
@@ -199,13 +198,16 @@ def evaluate_thrust(self,state):
             total_motor_current = total_motor_current + factor*motor.outputs.current
 
             # Pack specific outputs
-            conditions.propulsion.propeller_motor_torque[:,ii] = motor.outputs.torque[:,0]
-            conditions.propulsion.propeller_torque[:,ii]       = Q[:,0]
-            conditions.propulsion.propeller_rpm[:,ii]          = rpm[:,0]
-            conditions.propulsion.propeller_tip_mach[:,ii]     = (R*rpm[:,0]*Units.rpm)/a[:,0]
-            conditions.propulsion.disc_loading[:,ii]           = (F_mag[:,0])/(np.pi*(R**2)) # N/m^2                  
-            conditions.propulsion.power_loading[:,ii]          = (F_mag[:,0])/(P[:,0])      # N/W               
-            conditions.noise.sources.propellers[prop.tag]      = outputs            
+            conditions.propulsion.propeller_motor_efficiency[:,ii] = etam[:,0]  
+            conditions.propulsion.propeller_motor_torque[:,ii]     = motor.outputs.torque[:,0]
+            conditions.propulsion.propeller_torque[:,ii]           = Q[:,0]
+            conditions.propulsion.propeller_thrust[:,ii]           = np.linalg.norm(total_thrust ,axis = 1) 
+            conditions.propulsion.propeller_rpm[:,ii]              = rpm[:,0]
+            conditions.propulsion.propeller_tip_mach[:,ii]         = (R*rpm[:,0]*Units.rpm)/a[:,0]
+            conditions.propulsion.disc_loading[:,ii]               = (F_mag[:,0])/(np.pi*(R**2)) # N/m^2                  
+            conditions.propulsion.power_loading[:,ii]              = (F_mag[:,0])/(P[:,0])      # N/W      
+            conditions.propulsion.propeller_efficiency[:,ii]       = etap[:,0]      
+            conditions.noise.sources.propellers[prop.tag]          = outputs
 
         # Run the avionics
         avionics.power()
@@ -350,7 +352,8 @@ def add_unknowns_and_residuals_to_segment(self, segment, initial_power_coefficie
         n_res = n_props 
 
         # Assign initial segment conditions to segment if missing
-        append_initial_battery_conditions(segment)          
+        battery = self.battery
+        append_initial_battery_conditions(segment,battery)          
 
         # Setup the residuals
         segment.state.residuals.network = 0. * ones_row(n_res)
@@ -359,12 +362,15 @@ def add_unknowns_and_residuals_to_segment(self, segment, initial_power_coefficie
         segment.state.unknowns.propeller_power_coefficient = initial_power_coefficient * ones_row(n_props)
 
         # Setup the conditions
-        segment.state.conditions.propulsion.propeller_motor_torque = 0. * ones_row(n_props)
-        segment.state.conditions.propulsion.propeller_torque       = 0. * ones_row(n_props)
-        segment.state.conditions.propulsion.propeller_rpm          = 0. * ones_row(n_props)
-        segment.state.conditions.propulsion.disc_loading           = 0. * ones_row(n_props)                 
-        segment.state.conditions.propulsion.power_loading          = 0. * ones_row(n_props)
-        segment.state.conditions.propulsion.propeller_tip_mach     = 0. * ones_row(n_props)
+        segment.state.conditions.propulsion.propeller_motor_efficiency = 0. * ones_row(n_props)
+        segment.state.conditions.propulsion.propeller_motor_torque     = 0. * ones_row(n_props)
+        segment.state.conditions.propulsion.propeller_torque           = 0. * ones_row(n_props)
+        segment.state.conditions.propulsion.propeller_thrust           = 0. * ones_row(n_props)
+        segment.state.conditions.propulsion.propeller_rpm              = 0. * ones_row(n_props)
+        segment.state.conditions.propulsion.disc_loading               = 0. * ones_row(n_props)                 
+        segment.state.conditions.propulsion.power_loading              = 0. * ones_row(n_props)
+        segment.state.conditions.propulsion.propeller_tip_mach         = 0. * ones_row(n_props)
+        segment.state.conditions.propulsion.propeller_efficiency       = 0. * ones_row(n_props)        
 
         # Ensure the mission knows how to pack and unpack the unknowns and residuals
         segment.process.iterate.unknowns.network  = self.unpack_unknowns

trunk/SUAVE/Components/Energy/Storages/Batteries/Constant_Mass/Lithium_Ion.py

@@ -145,14 +145,14 @@ def energy_calc(self,numerics,battery_discharge_flag= True):
         Q_prior           = battery.cell_charge_throughput 
         R_growth_factor   = battery.R_growth_factor
         E_growth_factor   = battery.E_growth_factor 
-        I                 = numerics.time.integrate  
+        I                 = numerics.time.integrate
+        D                 = numerics.time.differentiate
 
         if not battery_discharge_flag:   
             I_bat = -I_bat  
         # ---------------------------------------------------------------------------------
         # Compute battery electrical properties 
         # --------------------------------------------------------------------------------- 
-        n_parallel        = battery.pack_config.parallel  
 
         # Update battery capacitance (energy) with aging factor
         E_max = E_max*E_growth_factor
@@ -176,6 +176,21 @@ def energy_calc(self,numerics,battery_discharge_flag= True):
         dT_dt     = Q_heat_gen /(bat_mass*bat_Cp)
         T_current = T_current[0] + np.dot(I,dT_dt)
 
+        # Possible Energy going into the battery:
+        energy_unmodified = np.dot(I,P)
+
+        # Available capacity
+        capacity_available = E_max - battery.current_energy[0]
+
+        # How much energy the battery could be overcharged by
+        delta           = energy_unmodified -capacity_available
+        delta[delta<0.] = 0.
+
+        # Power that shouldn't go in
+        ddelta = np.dot(D,delta) 
+
+        # Power actually going into the battery
+        P[P>0.] = P[P>0.] - ddelta[P>0.]
         E_bat = np.dot(I,P)
         E_bat = np.reshape(E_bat,np.shape(E_current)) #make sure it's consistent
 

trunk/SUAVE/Components/Energy/Storages/Batteries/Constant_Mass/Lithium_Ion_LiFePO4_18650.py

@@ -14,7 +14,6 @@
 
 # package imports 
 import numpy as np 
-from scipy.integrate import  cumtrapz
 
 ## @ingroup Components-Energy-Storages-Batteries-Constant_Mass
 class Lithium_Ion_LiFePO4_18650(Lithium_Ion):

trunk/SUAVE/Components/Energy/Storages/Batteries/Constant_Mass/Lithium_Ion_LiNiMnCoO2_18650.py

@@ -15,7 +15,7 @@
 
 import numpy as np
 import os
-from scipy.integrate    import  cumtrapz , odeint 
+from scipy.integrate    import  cumtrapz
 from scipy.interpolate  import RegularGridInterpolator 
 
 ## @ingroup Components-Energy-Storages-Batteries-Constant_Mass
@@ -155,11 +155,11 @@ def energy_calc(self,numerics,battery_discharge_flag = True ):
         T_current                = battery.pack_temperature      
         T_cell                   = battery.cell_temperature     
         E_max                    = battery.max_energy
-        R_growth_factor          = battery.R_growth_factor 
         E_current                = battery.current_energy 
         Q_prior                  = battery.cell_charge_throughput  
         battery_data             = battery.discharge_performance_map     
         I                        = numerics.time.integrate      
+        D                        = numerics.time.differentiate
 
         # ---------------------------------------------------------------------------------
         # Compute battery electrical properties 
@@ -228,12 +228,31 @@ def energy_calc(self,numerics,battery_discharge_flag = True ):
         # Compute updates state of battery 
         # ---------------------------------------------------------------------------------   
 
-        # Determine actual power going into the battery accounting for resistance losses
-        E_bat = np.dot(I,P) 
+        # Possible Energy going into the battery:
+        energy_unmodified = np.dot(I,P)
+
+        # Available capacity
+        capacity_available = E_max - battery.current_energy[0]
+
+        # How much energy the battery could be overcharged by
+        delta           = energy_unmodified -capacity_available
+        delta[delta<0.] = 0.
+
+        # Power that shouldn't go in
+        ddelta = np.dot(D,delta) 
+
+        # Power actually going into the battery
+        P[P>0.] = P[P>0.] - ddelta[P>0.]
+        E_bat = np.dot(I,P)
+        E_bat = np.reshape(E_bat,np.shape(E_current)) #make sure it's consistent
+
+        # Add this to the current state
+        if np.isnan(E_bat).any():
+            E_bat=np.ones_like(E_bat)*np.max(E_bat)
+            if np.isnan(E_bat.any()): #all nans; handle this instance
+                E_bat=np.zeros_like(E_bat)
 
-        # Determine current energy state of battery (from all previous segments)          
         E_current = E_bat + E_current[0]
-        E_current[E_current>E_max] = E_max
 
         # Determine new State of Charge 
         SOC_new = np.divide(E_current, E_max)

trunk/SUAVE/Methods/Power/Battery/append_initial_battery_conditions.py

@@ -14,7 +14,7 @@
 #  Methods
 # ----------------------------------------------------------------------
 ## @ingroup Methods-Power-Battery 
-def append_initial_battery_conditions(segment): 
+def append_initial_battery_conditions(segment,battery): 
     """ Packs the initial battery conditions
     
         Assumptions:
@@ -90,11 +90,21 @@ def append_initial_battery_conditions(segment):
         pack_temperature              = segment.battery_pack_temperature 
     propulsion.battery_pack_temperature[:,0] = pack_temperature
     propulsion.battery_cell_temperature[:,0] = pack_temperature
+
+
+    if 'battery_max_aged_energy' in segment:
+        battery_max_aged_energy = segment.battery_max_aged_energy
+    else:
+        battery_max_aged_energy = battery.max_energy
+
+
+    propulsion.battery_max_aged_energy = battery_max_aged_energy   
+
+
 
     if 'battery_energy' in segment: 
 
         initial_segment_energy         = segment.battery_energy
-        battery_max_aged_energy        = segment.battery_energy 
         initial_mission_energy         = segment.battery_energy 
 
         if 'battery_cycle_day' not in segment: 
@@ -120,7 +130,7 @@ def append_initial_battery_conditions(segment):
         # Pack into conditions
         propulsion.battery_max_initial_energy           = initial_mission_energy
         propulsion.battery_energy[:,0]                  = initial_segment_energy 
-        propulsion.battery_max_aged_energy              = battery_max_aged_energy   
+
         propulsion.battery_cycle_day                    = cycle_day        
         propulsion.battery_cell_charge_throughput[:,0]  = cell_charge_throughput 
         propulsion.battery_resistance_growth_factor     = resistance_growth_factor