Battery_modelling Simulink

2021年1月25日发(作者：malnutrition)
Battery
-

Implement generic battery model

Library
Electrical Sources, Electric Drives/Extra Sources
Description

The
Battery
block
implements
a
generic
dynamic
model
parameterized
to
represent most popular types of rechargeable batteries.
The equivalent circuit of the battery is shown below:

Lead-Acid Model
Discharge model (i* > 0)

Charge Model (i* < 0)

Lithium-Ion Model
Discharge Model (i* > 0)

Charge Model (i* < 0)

Nickel- Cadmium and Nickel-Metal-Hydride Model
Discharge Model (i* > 0)

Charge Model (i*< 0)

where,
E
Batt
= Nonlinear voltage (V)
E
0
= Constant voltage (V)
Exp(s) = Exponential zone dynamics (V)
Sel(s)
=
Represents
the
battery mode.
Sel(s)
=
0
during
battery discharge,
Sel(s) = 1 during battery charging.
K = Polarization constant (Ah
-1
) or Polarization resistance (Ohms)
i* = Low frequency current dynamics (A)
i = Battery current (A)
it = Extracted capacity (Ah)
Q = Maximum battery capacity (Ah)
A = Exponential voltage (V)
B = Exponential capacity (Ah)
-1

The
parameters
of
the
equivalent
circuit
can
be
modified
to
represent
a
particular
battery
type,
based
on
its
discharge
characteristics.
A
typical
discharge curve is composed of three sections, as shown in the next figure:

The first section represents the exponential voltage drop when the battery is
charged. Depending on the battery type, this area is more or less wide. The
second section represents the charge that can be extracted from the battery
until
the
voltage
drops
below
the
battery
nominal
voltage.
Finally,
the
third
section represents the total discharge of the battery, when the voltage drops
rapidly.
When
the
battery
current
is
negative,
the
battery
will
recharge
following
a
charge characteristic as shown below:

Note
that
the
parameters
of
the
model
are
deduced
from
discharge
characteristics and assumed to be the same for charging.
The
Exp(s)
transfer
function
represents
the
hysteresis
phenomenon
for
the
Lead-Acid, NiCD and NiMH batteries during charge and discharge cycles. The
exponential voltage increases when battery is charging, no matter the SOC of
the battery. When the battery is discharging, the exponential voltage decreases
immediately:

Dialog Box and Parameters
Parameters Tab

Battery type

Provides a set of predetermined charge behavior for four types of battery:
Lead-Acid
Lithium-Ion
Nickel- Cadmium
Nickel-Metal-Hydride
Nominal Voltage (V)

The
nominal
voltage
(
Vnom
)
of
the
battery
(volts).
The
nominal
voltage
represents the end of the linear zone of the discharge characteristics.
Rated Capacity (Ah)

The rated capacity (
Qrated
) of the battery in ampere-hour
. The rated capacity is
the minimum effective capacity of the battery.
Initial State-Of-Charge (%)

The initial State-Of-Charge (SOC) of the battery. 100% indicates a fully charged
battery and 0% indicates an empty battery. This parameter is used as an initial
condition for the simulation and does not affect the discharge curve (when the
option
Plot Discharge Characteristics
is used).
Use parameters based on Battery type and nominal values

Load the corresponding parameters in the entries of the dialog box, depending
on the selected
Battery type
, the
Nominal Voltage
and the
Rated Capacity
.
When a preset model is used, the detailed parameters cannot be modified. If
you want to modify the discharge curve, select the desired battery type to load
the
default
parameters,
and
then
uncheck
the
Use
parameters
based
on
Battery
type
and
nominal
values

checkbox
to
access
the
detailed
parameters.
Maximum Capacity (Ah)

The
maximum
theoretical
capacity
(
Q
),
when
a
discontinuity
occurs
in
the
battery voltage. This value is generally equal to 105% of the rated capacity.
Fully charged Voltage (V)

The fully charged voltage (
Vfull
), for a given discharge current. Note that the
fully charged voltage is not the no-load voltage.
Nominal Discharge Current (A)

The
nominal
discharge
current,
for
which
the
discharge
curve
has
been
measured. For example, a typical discharge current for a 1.5 Ah NiMH battery is
20% of the rated capacity: (0.2 * 1.5 Ah / 1h = 0.3A).
Internal Resistance

The internal resistance of the battery (ohms). When a preset model is used, a
generic value is loaded, corresponding to 1% of the nominal power (nominal
voltage
*
rated
capacity
of
the
battery).
The
resistance
is
supposed
to
be
constant during the charge and the discharge cycles and does not vary with the
amplitude of the current.
Capacity (Ah) @ Nominal Voltage

The capacity (
Qnom
) extracted from the battery until the voltage drops under
the nominal voltage. This value should be between
Qexp
and
Qmax
.
Exponential zone [Voltage (V), Capacity (Ah)]

The voltage (
Vexp
) and the capacity (
Qexp
) corresponding to the end of the
exponential zone. The voltage should be between
Vnom
and
Vfull
. The capacity
should be between 0 and
Qnom
.
View Discharge Characteristics Tab

Plot Discharge Characteristics

If selected, plots a figure containing two graphs. The first graph represents the
nominal discharge curve (at the
Nominal Discharge Current
) and the second
graph
represents
the
discharge
curves
at
the
specified
discharge
currents.
When the checkbox is active, the graph remains on and updates itself when a
parameter changes in the dialog box. To clear the figure, uncheck and close the