welcome to this demonstration of the
singlephase grid tide inverter as for
the other functions of the home energy
production control unit be aware that
this function has a high complexity
level and thus basic knowledge about the
buck boost Chopper and pwm rectifier
inverter are recommended before using
this
function once the chopper inverter
control window is fully Open click here
to select the function you want to use
from the list here the single phase grid
tide inverter note that a window may
appear just do as it says or click okay
for automatic
configuration now go here under function
settings to see all the features
available for this
function status indicates if the
function is started or not in the pwm
rectifier inverter settings we get
active current command sets the desired
active output current
reactive current command sets the
desired reactive output current Q2 Q5 Q3
q6 the transistors used by the pwm
rectifier inverter you can choose for
each one pwm or on or off for
troubleshooting finally settings for the
DC
bus our DC bus voltage command sets the
value of the DC bus q1 and Q4 the the
transistors used by the buck boost
Chopper again you can choose pwm on or
off for each
one here are the two knobs to control
the active and reactive output current
and the start stop button to control the
function meters C1 and C2 respectively
track the duty cycle of the buck boost
Chopper and the DC bus
voltage just hit the single or
continuous refresh button here to see
the results
just above these meters you get the
electrical diagram of the function note
that E3 E4 and I4 need to be connected
exactly as shown for this function to
work properly if you need more help with
the connection process refer to the show
connection button here for a complete
connection
diagram let's take a look at the
electrical diagram three small
electronic circuits can be found within
this
function a buck boost Chopper allows
connection of a low DC voltage to high
DC voltage while keeping control on the
power flow through the duty cycle a pwm
rectifier inverter which is a DC toac
converter allows the connection between
the AC and DC networks while also
keeping control over the power flow and
finally a low pass filter that cuts out
high frequencies and most harmonics
created by the pwm rectifier inverter
the important fact about this function
is that the user has control over the
active and and reactive current in both
Direction and amplitude which allows
charging the battery pack from the AC
Network or returning power to the AC
network from the battery pack since this
equipment is fully connected let's start
the
function on the scope here the yellow
curve is the output AC voltage the blue
curve is the output AC current the
purple curve is the output power and
finally the red curve is the voltage of
the battery
pack let's first set the reactive
current to zero as you see when I
increase the active current the output
power increases but is negative as shown
on the
scope you can also see that the output
current has a phase shift of 180° with
the output voltage
here by looking at the red curves value
notice that the voltage of the battery
pack has
increased all this data means that we
are currently charging the battery pack
from the AC Network
however if I decrease the active current
into a negative value then it becomes in
Phase with the output voltage and the
power becomes positive which means that
we are now returning power to the AC
network from the battery pack explaining
why its voltage is now
low let's do the same with the reactive
current first I set the active current
to zero then I increase the reactive
current we observe that the output power
increases in amplitude as as the current
clearly lags behind the voltage with an
angle of 90° if we look at the value
here you can see that the average active
power is zero as expected the actual
circuit produces reactive power only
using pure reactive
current if I decrease the reactive
current to a negative value you will see
that the current now leads the output
voltage by 90° and the average output
power is still around
zero the control over both active and
reactive current gives the user the
opportunity to control the power flow in
both amplitude and
Direction it is a very interesting
function and you should try mixing the
active current and reactive current at
the same time to see what
happens that's it for the single phase
grid tide inverter