Power Quality Improvement and Low Voltage Ride through Capability in Hybrid Wind-PV Farms Grid-Connected Using Dynamic Voltage Restorer


The paper proposes the utilization of a Dynamic Voltage Restorer (DVR) to upgrade the power quality and enhance the low voltage ride through (LVRT) capacity of a three-stage medium-voltage organize associated with a cross breed dissemination age (DG) framework. In this framework, the photovoltaic (PV) plant and the breeze turbine generator (WTG) are associated with a similar purpose of normal coupling (PCC) with a touchy load. The WTG comprises of a DFIG generator associated with the system by means of a stage up transformer. The PV framework is associated with the PCC by means of a two-organize vitality transformation (DC-DC converter and DC-AC inverter).

This topology permits, first, the extraction of most extreme power dependent on the gradual inductance method. Second, it permits the association of the PV framework to the general population matrix through a stage up transformer. Likewise, the DVR dependent on Fuzzy Logic Controller (FLC) is associated with the equivalent PCC. Diverse blame condition situations are tried for enhancing the productivity and the nature of the power supply and consistence with the necessities of the LVRT framework code. The aftereffects of the LVRT ability, voltage dependability, dynamic power, responsive power, infused current, and DC connect voltage, speed of turbine and power factor at the PCC are given and without the commitment of the DVR framework.



Fig. 1. The system configuration of PV/wind hybrid power system.


FIGURE 2: Voltage phase magnitude at PCC during faults with typical LVRT and HVRT characteristics requirements of Distributed Generation Code of Germany as an example.

FIGURE 3: Voltage phase magnitude at PCC during sag fault.

FIGURE 4: Voltage phase magnitude at PCC during short circuit fault

FIGURE 5: Phase voltage at PCC during sag fault.

FIGURE 6: DVR voltage contribution at PCC during sag fault.

FIGURE 7: Phase voltage at PCC during short circuit fault.

FIGURE 8: Total active power of hybrid system at PCC injected to grid.

FIGURE 9: PV active power at PCC injected to grid.

FIGURE 10: Wind active power at PCC injected to grid.

FIGURE 11: Total reactive power of hybrid system at PCC injected to grid.

FIGURE 12: PV reactive power at PCC injected to grid.

FIGURE 13: Wind reactive power at PCC injected to grid.

FIGURE 14: Total PV-WT current injected to grid at PCC.

FIGURE 15: PV current injected at PCC.

FIGURE 16: WT current injected at PCC to grid.


The reproduction examine was completed utilizing MATLAB to show the viability of the proposed DVR control framework to enhance the power quality and LVRT ability of the half and half PV-WT control framework. The framework has been tried under various blame condition situations. The outcomes have demonstrated that the DVR associated with the PV-Wind cross breed framework at the medium voltage network is extremely viable and can relieve voltage blackouts and short out disappointment with enhanced voltage direction abilities and adaptability in the amendment of the power factor.

The consequences of the reenactment additionally demonstrate that the framework structured is secure since the required voltage ranges are regarded accurately and the DG generators work dependably. The primary favorable position of the proposed structure is the fast recuperation of voltage; the power motions overshoot decrease, control of rotor speed and keeping the framework from having a DC connect overvoltage and consequently expanding the solidness of the power framework as per LVRT prerequisites.

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