Abstract
The DC-link voltage is an essential intermediate stage between the DC/DC and DC/AC converters in solar energy system. Due to the voltage fluctuations and current disturbances, a controller should be suitably designed to maintain the DC-link voltage well stabilized. In this paper, a variant of an adaptive DC-link voltage controller is proposed, namely PI-Fuzzy controller. The proposed controller has a fixed integral gain, while the proportional gain is determined based on a set of Fuzzy logic inference rules. Moreover, an anti-windup mechanism is added to the proposed controller to overcome integrator windup when the actuator saturates. Simulation results show that the proposed controller provides better rejection of current disturbances and fastest rise-time comparing to recently proposed PI-controllers for the DC-link voltage control.
Highlights
Renewable energy resources, such as solar, wind, and hydroelectricity, are promising alternatives to traditional energy resources, e.g. oil and gas which are known to be limited, costly, contaminate the environment, and increase global warming
Solar energy can be converted to electrical energy using photo voltaic (PV) panel which is converted to three phase sinusoidal voltages by means of three phase inverters
In order to evaluate the dynamic performance of the proposed PI-Fuzzy controller, simulation experiments are performed in order to compare the proposed controller with two PI-controllers proposed in the literature for the DC-link voltage control
Summary
Renewable energy resources, such as solar, wind, and hydroelectricity, are promising alternatives to traditional energy resources, e.g. oil and gas which are known to be limited, costly, contaminate the environment, and increase global warming. An adaptive PI controller with anti-windup is recently proposed in [17] to improve the DC-link controller performance by changing the PI gains in two regions. In the second region, which is far from the desired DC-link reference voltage, the values of Kp and Ki are fixed It has excellent performance in terms of stability, immunity to large disturbance, low overshoot at step input, and low total harmonic distortion (THD) at grid voltages. A PI-Fuzzy controller is proposed for DC-Link voltage controller in PV connected to the power grid system. Instead of regular pole-placement gains calculations, the knowledge of the system’s mathematical model is used to build if- rules using fuzzy logic to adaptively change the controller gains to improve the dynamic performance of the DC-link voltage controller.
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