The voltage controller measures the DC voltage and calculates the error compared to the VDC reference value. Get a free trial license valid for 30 days! This current charges the DC bus, which is split into two series-connected capacitors, with the mid-point connected to each of the three IGBT legs.
A low pass filter is inserted into the feedback path from the Ia,b,c measurement to represent the limited bandwidth of the current sensor.
Clamping diodes are placed between the capacitor mid-point and the one-quarter and three-quarter points of each leg. The power module has two configurations: The mid-point of each leg is then fed to the respective phase of the AC grid via an inductor.
The perturbation caused by the step change in current from the PV array is regulated out in approximately 50 ms. Power circuit The circuit model is a bidirectional three-level voltage-source inverter VSIwith three legs, one per phase, each containing two series-connected high-side switches and two series-connected low-side switches.
The current controller has separate PI regulators for direct and quadrature currents that produce a Vdq reference. The switching pattern clearly shows a three-level pulse train with the fundamental waveforms phase-shifted. Modulation indices are generated for each of the three separate modulators for the three phase legs.
A phase-locked loop generates the reference phase angle for the abc to dq transformations. Choose the license options and request a quote! Control An outer voltage controller implemented as a PI regulator provides a current setpoint to an inner dq current controller.
The AC phase voltages and currents are measured and fed to the current controller. The averaged configuration is particularly well suited for real-time simulations with high switching frequencies, such as for hardware-in-the-loop testing.
It provides 10 ADC for the first half of the simulation and 15 ADC for the second half of the simulation, corresponding to a sudden increase in received solar energy. The DC source, e. Often, IGBTs with anti-parallel diodes are used as the switches for an NPC converter, but other two-quadrant switch configurations can also be employed.This PLECS demo model illustrates a neutral-point clamped (NPC), three-level voltage-source inverter.
The NPC topology has been adopted for high power applications as it can achieve better harmonic reduction than traditional two-level voltage source inverters and the associated control strategies help to minimize semiconductor losses. Application thermal research of forced-air cooling system in high-power NPC three-level inverter based on power module block.
The three-level neutral-point-clamped (NPC) inverter, widely used in applications for a three-phase three-wire system, originally has the structure of split dc capacitors. So the existing dc neutral point can be directly utilized as the ground return.
Application of a three-level NPC inverter as a three-phase four-wire power quality compensator by generalized 3DSVM Article (PDF Available) in IEEE Transactions on Power Electronics 21(2) An NPC module is often called a three-level module.
When an NPC module is used as in inverter operation, the DC-link voltage can be converted into a variable alternating voltage and variable frequency. IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 21, NO. 2, MARCH 1 Application of a Three-level NPC Inverter as a Three-Phase Four-Wire Power Quality.Download