Load-side Voltage Compensation of Small Hydropower Grid-connected System Using DVR based on PV Source

Hydro turbine generator is one of the alternative renewable energy to replace the existing power supply sources in the remote settlement or to increase the efficiency in power distribution system. Small hydro turbine is connected to the grid for dividing current and power into the load. According to the power quality problem, the voltage amplitutde will be changed in power distribution system and directly effect to the electric load. Dynamic voltage restorer (DVR) is a custom power device used for compensating the voltage ampitude when power quality problem occurred. Therefore, this paper presents a simulation model of small hydro turbine generator connected to the grid and three-level diode-clamped converter DVR that using the photovoltaic (PV) system as alternative DC source. Low-pass filter is used for filter harmonics and reduction signal distortion from the DVR which is considering output voltage waveform of the converter. Simulations were carried out by using the MATLAB/Simulink program. The simulation results proved the capability of DVR based on PV system under the eliminating voltage sag distributed system. Improving of the voltage in power distribution system as an energy generator and stabilizing its voltage is the main result of this work.