Research On APF Harmonic Detection Based On Adaptive Algorithm

The application of power electronic equipment and the use of nonlinear load increase in the power system, the harmonic influence has more and more serious with the development of industry. Therefore, it is an urgent need for high quality power quality. Harmonic current detection has important research significance and practical significance. Therefore, this paper discusses and studies the shunt active power filter to solve the power quality problems and increase the stability and security of the system.From the beginning of this paper, it is brief introduction of the development of the active power filter and harmonic current control strategy. The paper given that the mathematical model of shunt active power filter is established and discussed that how to control the harmonic current method. The paper given that two angles of harmonic current method of reference voltage and reference current, analyzing the difference between the reference voltage and reference current. So, considering reactive current compensation and harmonic current compensation two status. This paper given that contrast to the generalized integrator and the selective band pass filter on how to extract fundamental positive sequence currents. At the same time, the paper discussed that the unbalanced load and the three-phase unbalanced load. According to the structure and principle of shunt active power filter, this paper given that the designed of ht circuit parameters. This paper analyzing the space vector of the PWM of the voltage hysteresis control method in harmonic current tracking control strategy.According to the classical theory of instantaneous reactive power, this paper given that the harmonic current compensation and its stability and convergence. The adaptive LMS algorithm is used to detect the current, in this paper, because the LMS algorithm has a certain contradiction in stability and convergence speed. This paper given that the LMS algorithm is embedded in the low pass filter and the mathematical modeling of it is performance analysis, from a certain extent, reducing the two dependencies and proving the implementation ability. The paper given that the simulation results of MATLAB at the end of this paper.