Inverter voltage loop control

What is the control structure of an inverter?

Both the controls are important for robust and efficient functionality of the whole system (Liu et al. 2020). The general control structure of inverter consists of two cascaded loops, one of them is an internal current control loop, controlling the grid current and the other is an outer voltage control loop, which controls the DC link voltage.

How do inverter controls work?

The inverter controls regulate the power delivered to the grid, the terminal voltage, and also maintain the microgrid frequency. The proposed control scheme uses a phase-locked loop (PLL) to establish the microgrid frequency at the inverter terminals, and to provide a phase reference that is local to the inverter. Active power output.

How do I use a closed voltage & current loop?

On the powerSUITE page, select Closed Voltage and Current Loop under Project Options. Select AC for output. Select SDFM for sensing if available on the design. Enter 60 Hz for frequency for the AC waveform. This will be the frequency of the inverter output. Under Inverter Power Stage Parameters, enter 110 VRMS for the output voltage.

What is a voltage source inverter?

Voltage source inverters (VSIs) are commonly used in uninterruptible power supplies (UPS) to generate a regulated AC voltage at the output. Control design of such inverter is challenging because of the unknown nature of load that can be connected to the output of the inverter.

What is phase-locked loop (PLL) in inverter control?

The voltage reference is taken as per the grid side requirements for inverter controller. Furthermore, the inverter control is responsible for maintaining the frequency and power at the AC side. In this mode, synchronization is important and it is achieved through phase-locked loop (PLL) by the control algorithm (Bisht et al. 2020).

What is the control strategy of a PLL inverter?

The block diagram of the entire control strategy is shown in Figure 1. The initial step in the control algorithm is to transform phase voltages and currents into stationary reference frame ( and ) quantities. The - and -voltage components are used by the PLL to estimate the frequency and establish the phase reference for the inverter.