This research article presents the method to control the DC voltage of the boost converter by using a proportional-integral (PI) controller. With AC voltage from a wind turbine generator, converting to DC voltage level by rectifier, this DC voltage controlled by PI controller is to control boost converter that sends DC links to the inverter which converting alternating current voltage to direct current voltage through three-phase load and to the grid-connected system. For switching the IGBTs in the inverter, the PWM signal, on the hysteresis current control, is controlled by the signal from the detected reference voltage based on the grid-connected system and the voltage from a wind turbine generator. The tests made the comparison of results from the simulation with the MATLAB/Simulink program and result from the hardware on the prototype. The power quality results, such as harmonic, power factor, are in acceptable ranges.
<p>This research presents tracking the maximum power of a<em> </em>photovoltaic to control a five-level inverter, a cascade type connecting a single-phase grid-connected system with a fuzzy logic control model. Maximum power tracking control In this research, the principle of controlling the maximum current amplitude of the photovoltaic multiplied by the sine signal per unit that used as a reference current compared to the grid current. Signal comparison with the PID controller allows the creation of five levels of PWM of cascade control of five-level inverter connects single-phase grids. The results of the simulation test using the program MATLAB/Simulink to compare with the generated prototype found that the fuzzy logic principle was used to control the maximum power tracking conditions of the P&O method, when the amount of radiation light intensity decreases suddenly, making it possible to track the maximum power of the photovoltaic. Also, when<em> </em>the inverter connected to the grid by controlling the power<em> </em>angle to compare results between the simulation and the prototype — found that the current flowing into the grid increases according to the power angle control. Resulting in a nearby waveform, sine wave and an out of phase angle to the grid voltage because the system is in the inverter mode, and the harmonic spectrum of the grid currently has total harmonic distortion (THD) is reduced as an indication of the proposed system can be developed and applications.</p>
In Thailand, shrimp farmers traditionally rely on the electricity supplied by government organization to perform air aeration in their shrimp ponds. This paper designs an affordable solar-powered aeration system for shrimp ponds, which promotes the productivity of Thai shrimp farmers. The aeration system consists of three parts: the control of maximum power point (MPP) tracking, the Z-source DC-DC converter, and battery charging. In the first part, the energy was controlled by algorithms like perturb and observe (P&O), incremental conductance (INC), fuzzy logic control (FLC) and genetic algorithm (GA). In the second part, a set of devices were designed to regulate the energy to be supplied to the inverter and aerator. In the third part, the battery was charged to support aerator operation at night. Comparative experiments show that the proposed aeration system improved the dissolved oxygen (DO) level in shrimp ponds by 7.48ppm on average from the level of the traditional method, and controlled the mean temperature in shrimp ponds at 30.33°C, which is favorable for shrimp growth. The research provides a satisfactory green aeration system for shrimp farmers in Thailand.
This research paper presents an optimization of shunt active power filter with proportional integral (PI) control in three-phase three-wire power systems. The method of optimization is to create a prototype shunt active power filter three-phase connected to the grid system with three-phase, three-wire, non-linear load supply to provide harmonics current monitors that occur in the system are reduced. This research has the advantage of using a threephase waveform voltage detection principle to generate one reference sine signal and calculate the current for compensation when compared to the harmonic current generated in the system. The compensated current will be used for PWM modulation with a hysteresis principle to control the three-phase shunt active power filter. That can control the follow-up current harmonic that occurs in the system. The results of the prototype equipment testing show that when the non-linear load is not shared by the parallel power filter prototype equipment with PI control, there is a total harmonic distortion of current in the grid system 40.56%. Conversely, when combined with the prototype of the power filter, the shunt active power filter with PI control causes the total harmonic distortion of current is reduced to 13.79%. Consequently, increasing the optimization of shunt active power filter with PI control in the three-phase three-wire power system can confirm that the method this will be used to develop and apply in the industry that there is a harmonic current generating device in the system.
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