電能質量調節(jié)器諧波檢測與控制策略的研究
[Abstract]:At present, with the wide application of various nonlinear power electronic devices, harmonic pollution in the power network is becoming more and more serious, and the power quality of power system is seriously challenged. As an important connotation of power quality regulator, active power filter (APF) plays an important role in harmonic control. It is of great theoretical and practical significance to study real-time, accurate and efficient APF. The harmonic suppression system of power quality regulator is studied in this paper. An improved adaptive harmonic detection algorithm with variable step size is proposed on the basis that the traditional adaptive harmonic detection algorithm with fixed step size can not meet the compatibility of dynamic response speed and steady-state accuracy. It uses a sliding integrator to extract real tracking errors, and in order to ensure both fast convergence and small steady-state errors, a fuzzy regulator with self-tuning factors is used. In the harmonic current compensation control algorithm, the SVPWM algorithm proposed in this paper overcomes the shortcomings of the traditional SVPWM algorithm, such as high output burr and high working frequency. It can limit the output of narrow pulse, reduce the output burr and reduce the switching frequency of IGBT. The utility model has the advantages of improving the utilization ratio of DC side voltage and so on. In order to verify the compensation performance of the APF prototype without affecting the normal operation of the power grid, a harmonic source completely isolated from the power grid is designed in this paper. The harmonic power supply is based on the fundamental sinusoidal function, and the harmonic function is superimposed. The harmonic current generated in the load loop is simulated as the compensation object.
【學位授予單位】:遼寧工程技術大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TM761
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