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Design and implementation of dynamic voltage restorer digital system based on optimal compensation control |
School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract To solve the problems of phase distortion and high active power consumption of traditional compensation control strategy, an optimization compensation control strategy was proposed. The dynamic voltage restorer (DVR) active power size was introduced to optimize the regulation amount of DC side voltage, and the systematic analysis on the compensation characteristics of compensation strategy was conducted. To solve the problems of nonlinear and impact load disturbance of invert output unit, a hybrid cascaded Hbridge multilevel invert topology was established, and the structure and working principle were analyzed. The multilevel DVR digital system including hardware and software was designed. On the Chroma6590 programmable AC power supply, the grid voltage was simulated, and the grid compensation experiment was conducted in the system.The results of simulation and experiment show that the designed DVR compensation effect is very good and can realize the minimum device output active power and prolong time compensation with effectively reduced output harmonic.
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