Abstract
The grid-connected inverter plays an important role in wind turbine grid-connected power generation system. The performance of inverter control strategy directly affects the grid-connected current quality. For quasi-proportional resonant(QPR) control, the output signal step of controller exists owing to the input signal step, and the grid current will be distorted by the low-frequency noise in the input signal. In order to solve these problems, the performance of quasi-PR control should be improved, so a method of constructing quasi-PR controller with two degrees of freedom is adopted, by which the improved controller can effectively suppress the influence of the step and low-frequency noise in the input signal on the grid-connected current. The improved controller is simulated on MATLAB, and the results show that the applied method can effectively improve the property of the existing problems of quasi-QPR controller and the quality of grid-connected current. Keywords: Grid-connected inverter, Harmonic compensator, Matlab/Simulation, 2-DOF,QPR. DOI: 10.7176/CTI/8-05
Highlights
In the recent world demands and use of electricity generation take a diversion towards renewable energy source because of large availability, clean environment, and less pollution
At the grid side for synchronization of power generated by the wind turbine and power demanded by grid station, we need to install a grid-connected inverter with wind power generators which can satisfy stringent control requirements under steady-state and transient conditions [1,2]
The Quasi-PR current Controller is examined for capacitive coupling (CC) grid-connected inverter system and in contradiction with the PI current controller, but the quasi-PR controller decrease the steady-state error[10]
Summary
In the recent world demands and use of electricity generation take a diversion towards renewable energy source because of large availability, clean environment, and less pollution. How to enhance the quality of grid-side current and compensate the harmonics has become research goal of renewable energy field[3]. The Quasi-PR current Controller is examined for capacitive coupling (CC) grid-connected inverter system and in contradiction with the PI current controller, but the quasi-PR controller decrease the steady-state error[10]. It produces a voltage reference for applying the carrier-based PWM to boost the quality of the waveform. The design procedure of QPR current controller and selective harmonics compensation method has been applied for 3rd, 5th, and 7th harmonics using Matlab tools
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