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a new family of multilevel grid connected inverters based on packed u cell topology

by:Fuyuang     2019-12-24
This paper introduces a new type of U cell packaged (PUC)
A grid-connected inverter based on multi-level is proposed.
Unlike the U unit arrangement consisting of two power switches and one capacitor, in the proposed converter topology, lower DC power supplies from renewable sources such as photovoltaic arrays (PV)
Used as a basic power supply.
This topology uses a small number of power switches and lower DC power supplies provided by renewable energy, providing higher efficiency and lower costs.
Other capacitor voltages use isolated DC-extract from base lower DC power supply
DC power converter.
The working principle of the proposed transformer-free multi-level grid-connected inverter is theoretically analyzed.
Through simulation, the operation of the proposed multi-level grid-connected inverter is verified.
Finally, the controller board was found by using the FPGA 407, and the simulation results were verified.
Multi-level inverters are the most suitable solutions for grid-connected renewable energy sources such as photovoltaic arrays (PV)
Or wind turbines.
The multi-level inverter can produce low harmonic, low stress high voltage on the power switch.
The most common multi-level inverter topology is Cascade H-bridge (CHB)
, Midpoint clamping (NPC)
And flying capacitors (FC).
Loading U cells (PUC)
Is a recently developed multi-level inverter that reduces the number of capacitors and power supplies.
The PUC topology requires only one high voltage DC power supply, and the lower voltage level is automatically generated in the packaged U-unit capacitor by switching operation.
However, many DC power supplies are needed for chronic hepatitis B inverters.
Compared to the FC topology, at the same number of voltage levels, the PUC inverter requires half of the power supply and a capacitor of 1 out of 3.
In addition, in the PUC inverter, the zero voltage level during the renewal period can be achieved without the use of additional power switches.
Therefore, the common mode voltage (CMV)
Will be zero during freedom;
Therefore, the leakage current of the ground will decrease significantly.
This paper presents a new type of multi-level inverter based on PUC.
Unlike the PUC topology, lower DC power supplies from renewable energy sources such as photovoltaic arrays (PV)
Used as a basic power supply.
In fact, other power supplies use isolated DC-extracted from basically lower DC power supplies
DC power converter.
In this case, the output peak voltage will be the sum of the lower DC source and single DC source extracted from the base power supply by isolating the DC power supply
DC power converter.
In addition, the DC supply voltage is an integer multiple of the lowest DC supply.
Therefore, compared with the PUC topology with a higher DC voltage source, multiple low voltage DC power supplies are used in the proposed multi-level inverter.
In addition, there is only one lower source and multiple isolated push
Pull or forward DC
In the PUC topology, a DC converter can be used instead of a higher DC voltage supply.
This paper introduces a new type of U cell packaged (PUC)
The multi-level grid-connected inverter is described in detail.
The U unit arrangement consists of two power switches and one capacitor.
However, in the proposed converter topology, lower DC power supplies from renewable sources such as photovoltaic arrays (PV)
Use, and the other voltage obtained through the capacitor is from the isolated DC-
DC power converter.
The topology uses only a small number of power switches and a lower DC power supply, providing higher efficiency and lower cost.
Other capacitor voltages are obtained using isolated DC-from a lower DC supply at the bottom
DC power converter.
After theoretically analyzing the working principle of the proposed transformer-free multi-level grid-connected inverter, the simulation study verifies the work of the proposed multi-level grid-connected inverter.
In order to verify the simulation results, an experimental prototype was carried out using the controller board found by the 2017-11-407.
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