Section Content

3.1. Understanding the Panels

When starting the demo, the panel in Figure 10 below appears first with the default settings.

Figure 10: Start-Up Panel - Inverter Mode Scenario

The panel is to be operated while following the three steps below:

Step 1: Select Scenario

In the upper left corner, the student can select the scenario using the three tabs:

Inverter Mode
LC Filter
Rectifier Mode

Step 2: Change Parameters / Switch Buttons

In the lower left corner, the student can change the control parameters and can switch the control buttons (to enable/disable their associated functions) in the following categories:

Scope Parameters
Protection
DC Source
Inverter Parameters
AC Source

Table 3 below summarizes the control parameters, while Table 4 in this page is dedicated for the control buttons.

Step 3: Observe Waveforms

On the right side, the student can observe the waveforms displayed in four scopes.
Additionally, the power flow, the fundamental voltage and total harmonic distortion (THD) for inverter and load are displayed.
More details are given in Tables 5 and 6 in this page.

Control Parameters	Default Value	Interval of Variation

Control Parameters	Default Value	Interval of Variation
DC Source Vdc (V)	120	[90; 160]
PWM Frequency (Hz)	3000	[900; 3000]
Reference Amplitude/modulation	0.8	[0; 0.8]
AC-source Amplitude (V)	70	[0; 100]
AC-source Frequency (Hz)	60	[0; 60]
AC-source Phase Shift (Deg)	0	[-90; 90]

Table 3: Control Parameters

Note

The “Save File” under Scope Parameters allows the student to give different file names for data acquisition, while the “Switch (50 Hz/60 Hz)” allows to select a reference frequency for power, THD and RMS computation.
It is possible to save up to eleven .mat files with the name “FileSavedcurrents_X (where X can be anywhere from 0 to 10).
The student can give X values via the “Save File”, and press “Data Acq.” for acquiring data.
The data acquired can be used for offline harmonic studies.

The saved data are in the following folder:
C:\OPAL-RT\TestDrive\v2.9.0.16\Models\Package4_CPU\package4_cpu_sm_master\OpNTtarget

Control Buttons	Associated functions
Trigger		The waveforms are not triggered. They “move”
		The waveforms are triggered with respect to a reference signal.
	This button is accessible and enabled in all scenarios
SYNCHRONIZE		The reference frequency is fixed to 60 Hz (or 50 Hz).
		The reference frequency used for the PWM generator is dictated by the AC-source frequency.
	This button is disabled in Rectifier Mode scenario
Apply Deadtime		The dead-time is not applied in the control of the switches.
		The dead-time is applied in the control of the switches.
	This button is disabled in Rectifier Mode scenario
Connect Filter		The capacitors mounted in delta configuration are disconnected from the circuit.
		The capacitors mounted in delta configuration are connected to the circuit, thus enabling the LC filter.
	This button is accessible in LC Filter and Rectifier Mode scenarios
PWM_DISABLE		The PWM generator is enabled, and the commands are sent to the IGBTs.
		The PWM generator is disabled; the diodes are the sole conducting elements.
	This button is accessible in Rectifier Mode scenario only
APPLY_RECT_LOAD		The resistive load is disconnected at the output of the rectifier, on the DC side.
		The resistive load is connected at the output of the rectifier, on the DC side.
	This button is accessible in Rectifier Mode scenario only
Data Acq.		Data acquisition is disabled.
		Data acquisition is activated and allows to record .mat files for offline studies, in particular harmonic analysis.
	This button is disabled in Rectifier Mode scenario
Reset		The reset push button is disabled.
		The reset push button is activated and simulates replacement of fuses after a fault.
	This button is accessible and enabled in all scenarios
HELP / BACK		Open the Help page associated to the scenario currently running.
		Close the Help page and go back to the simulations.
	This button is accessible and enabled in all scenarios
Fuse		The protection fuse is blown.
		The protection fuse is intact.
Switch		Reference frequency for PWM generation, 50 Hz or 60 Hz.

Three-phase Three-level NPC Converter - 3. Panels

Section Content

3.1. Understanding the Panels