A Review of Grid-Connected Inverters and Control Methods
Beginning with an introduction to the fundamentals of grid-connected inverters, the paper elucidates the impact of unbalanced grid voltages on their performance.
The control design of this type of inverter may be challenging as several algorithms are required to run the inverter. This reference design uses the C2000 microcontroller (MCU) family of devices to implement control of a grid connected inverter with output current control.
A high-level block diagram of a grid-connected solar microinverter system is shown in Figure 4. The term, “microinverter”, refers to a solar PV system comprised of a single low-power inverter module for each PV panel.
The inverter is interfaced to the grid via an LCL filter. A relay is used to connect and disconnect the inverter from the grid whenever required by the application. The schematic in Figure 11 shows the filtering and relay schematic section.
Grid connected inverters are generally more complex than the standalone because they must synchronize with the grid sinusoid and supply the current within the same phase. However, the first stages of design are quite the same on both types of inverters. Traditionally, solar systems used to implement a single, shared inverter for all panels.
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