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TRANSCRIPT
Hello.
In this lesson you will learn more about differenttypes of Photovoltaic, or PV, Power Plant
components supported in our library, theiradvantages and disadvantages.
Within the Distributed Energy resources groupthere is a PV power plant group of components.
By expanding that group, you will find twogroups of components: Legacy and Generic.
Legacy components include the following: NPCPV Inverter, PV Power Plant Switching and
Average, and PV Inverter Average.
The NPC PV inverter is explained in more detail
in the Power Electronics module.
The Legacy PV Plant (Switching) model is implementedwith a three-phase two-level inverter connected
to a current control loop.
The DC link is fed by a constant voltage source;thus, the PV plant is simplified on the DC side.
The PV output is defined through the plantsurface, and the efficiency can be varied
using the irradiance input.
The PV plant can operate in voltage or reactivepower control mode.
To see the PV Plant in action, check the MicrogridLibrary Tutorial videos in the Materials tab.
Both the Legacy PV Plant (Switching) and theLegacy PV Plant (Average) models utilize the
same controller and are behaviorally identical.
The differences in the electrical model betweenswitching and average components and their
associated benefits and applications are describedin lesson Distributed Energy Resources.
The component properties for both switchingand average components contain the following
tabs: General, Filter, and four advanced tabs.
Within the General tab, you can specify generalparameters like nominal voltage, power, frequency,
DC voltage, and so on.
The Filter tab allows you to specify LCL filterparameters.
The advanced tabs are mainly focused on specificcontrol parameters – for example PI gains
of the dq control.
The last component from the legacy group isthe PV inverter average.
This component is implemented with a three-phasecontrolled voltage source with a current control loop.
The DC link is fed by a PV panel source connectedexternally from the component.
The PV inverter can only operate in grid connectedmode.
It operates at either maximum power pointtracking, or MPPT, mode or reactive power
control mode when grid following.
Let’s now open a dedicated example fromour example library.
Click on examples, microgrid, pv plant, pvinverter (average).
As mentioned in previous lessons, legacy componentsare unlocked and you are able to modify them
according your needs.
The PV inverter is open on the DC side andyou are able to connect a PV panel source,
as is done in this example.
The photovoltaic panel element is modeledas a voltage-controlled current source capacitance
connected in parallel.
Now let’s see how the Waveform Generatorcan be used to create I-V curves.
As is already described in the Typhoon HILControl Center lesson, when you open the Waveform
Generator you can find two modes: GeneratePV and Import I-V curve.
In Generate PV mode, the PV file generatorgenerates a PV panel file based on standard
data-sheet PV panel parameters.
Generated PV panel files are loaded in theHIL SCADA model settings.
The HIL device generates the I-V curve basedon the specified PV parameters and the selected
temperature and irradiance values.
The irradiance and temperature values canbe modified during simulation runtime and
observed in a specialized widget called PVmonitor.
There are three types of PV models which youcan select depending on your needs: Detailed,
EN50530 Compatible, Normalized IV.
The detailed PV models the individual PV panel,therefore rated power is small.
This is better suited for precision PV applicationswhere MPPT efficiency and behavior are of interest.
In most microgrid applications you will havemultiple strings of PV panels corresponding
to an entire plant rating.
In that case, the lumped-parameter modelsprovided by the EN50530 Compatible and Normalized
IV types are better suited, as they save hardwareresources and make parametrization easier.
Detailed PV file settings are by default preconfiguredwith standard data-sheet PV panel parameters.
If the allow negative current option is checked,the PV panel will behave as if there is no
blocking diode.
EN50530 PV file settings are preconfiguredto follow the EN50530 standard by default.
It has a reduced parameter set compared tothe Detailed PV model, because some of the
parameters are already set.
Additional technology parameters can be changedif the PV type is set to User defined.
If you choose the Normalized IV model, youcan import a .csv file with raw data, and
then normalize them within the Waveform Generatortool.
Regardless of the model type you select, youare able to preview the curve with the Preview button.
Now that we have covered the Legacy group,let’s switch to Generic components.
As explained in previous lessons, the mainuse of generic components is to allow you
to easily parametrize nominal values, withoutneeding to adjust the details of the grid
filter or controller.
As such, Generic components are especiallyconvenient in grid stability and system integration testing.
The main purpose of these components is toemulate the characteristic behaviour of a
grid connected PV plant in the following scenarios:active power curtailment and reactive power
control, fault detection, ramping functionalitiesfor reference signals, and MPPT.
It is capable of operating in grid followingmode, with active power curtailment supported.
Clicking on the component properties opensseveral tabs.
In the General component tab, the generalparameters of the PV and the grid can be specified.
The PV Tab contains parameters that are relatedto the PV side of the component.
Just like the Battery ESS module, this componentsupports grid code functionality.
Converter and Grid extras are also the sameas in the generic battery example and cannot
be modified.
The inverter and pv panel are merged in thegeneric component.
Again, feel free to revisit lesson DistributedEnergy Resources, for more information on
when to use legacy or generic components.
Keep in mind that the PV generic componentwill continue to receive functionality updates
as we progress in future releases, while thelegacy components will remain as they are.
In order to test the pv power plant genericcomponent, you can run an example from our
example library.
The path for that example is: Examples, microgrid,pv plant, pv plant (generic).
You can find an Example explanation and sometest cases in the corresponding application
note, linked in the Examples Explorer pageas well as here in the Materials tab.
Feel free to click around and explore thefunctionalities currently available in the
generic component using these guides.
With this lesson we covered the PV group ofmicrogrid components.
Again, please remember that PV generic componentwill continue to receive functionality updates
as we progress in future releases, while legacycomponents will remain as they are.
The next lesson will be focused on the Dieselgenerator.
See you then.
Thanks for watching!
