Abstract
Among various power quality problems, voltage sag and swell are dominant where loads are very sensitive to the voltage disturbances. Various custom power devices are introduced recently to overcome these voltage issues, dynamic voltage restorer (DVR) is one of them. It offers very cost effective solution for problems such as voltage sag, swell and harmonics by establishing the proper voltage level during voltage disturbances to protect sensitive loads. In this paper, performance of DVR to improve power quality is done for solar photovoltaic (PV) based generation system feeding the grid and the three phase linear load. Solar PV generation system is implemented with an incre-mental conductance (IC) maximum power point tracking (MPPT) technique. The DVR is connected in between solar PV system and load. The basic structure of DVR is modified by using the photovoltaic system as an alternative to DC source and in place of conventional 2-level voltage source converter (VSC) neutral point clamped (NPC) multi level inverter is used. The system performance is analyzed in the MATLAB/Simulink environment. The simulation results justified the efficiency of modified DVR in the mitigation of voltage sag in distri-bution system. Improvement of power quality by stabilizing voltage during fault and promoting renewable energy is the main framework of this work.
Highlights
Power quality problems such as sags, swells, transients, interruptions and harmonics are directly affects the electric load
The dynamic voltage restorer (DVR) without solar PV system supported by battery, super capacitor and fuel cell as energy storage device/DC voltage source for power quality improvement in electrical distribution system is presented in Ref. [6,7,8]
Solar PV supported DVR with DC-DC boost converters are incorporated to function as a high capacity DC voltage source presented in Ref. [9] and in order to attain the optimal utilization of solar PV system, a simple DC-DC converter associated through a function called maximum power point tracking (MPPT) technique is presented in Ref. [10] for single phase distribution system
Summary
Power quality problems such as sags, swells, transients, interruptions and harmonics are directly affects the electric load. Dynamic Voltage Restorer (DVR) is a Custom Power Device (CPD) used to mitigate voltage sags/swells and to normalize load voltage. The active power compensation capability of the DVR depends on the capacity of the energy storage device/DC voltage source and the employed compensation technique [4,5]. The DVR without solar PV system supported by battery, super capacitor and fuel cell as energy storage device/DC voltage source for power quality improvement in electrical distribution system is presented in Ref. Solar PV supported DVR with DC-DC boost converters are incorporated to function as a high capacity DC voltage source presented in Ref. The scope of work presented in this paper is to offer a model based analytical approach to design a solar PV supported DVR, where IC MPPT technique extracts maximum power from solar PV generation system and DVR with space vector control schemes are used in three phase DVR system, and highlighted with simulation results
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