Design and Analysis of a Hybrid Renewable Energy System (HRES) With a Z-Source Converter for Reliable Grid Integration

Block Diagram of HRES With Z-Source Converter

The illustration of the PV-Wind-Battery based HRES along with a Z-source converter is displayed in Figure 1.

Figure 1.

Block diagram of HRES with Z-source converter (Santhoshi et al., 2021)

The PV output is boosted with the assistance of a Z-source converter and the converter’s output is regulated by a PI controller. DFIG based wind turbine is utilized in this work and its output is regulated by a PI controller. A battery storage system is included to store the excess energy and the battery’s SOC is monitored by ANN. The output of HRES is fed to the grid through a 3𝜙 VSI and grid synchronization is accomplished by DQ theory and the appropriate pulses for the inverter is generated by SVPWM technique.

These converters perform well when analogized with traditional converters, as it uses an impedance circuit which assists in coupling the power source with the main circuit of the converter. The schematic of the Z-source converter is displayed in Figure 2 (a).

Figure 2.

(a) Schematic of basic configuration of Z-source converter, (b) simplified ZSC

Z-source topologies have a unique feature that this is employed for AC-DC and AC-AC power conversions. As demonstrated in Figure 2 (a), the converter comprises of an impedance circuit of X-shape, which has two capacitors and two split inductors and this impedance circuit provides coupling among the inverter and the source.