| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 93 === Following the increased concern of electric power quality along with high capacity requirements of installed equipment nowadays, a modular design of dynamic voltage restorer is thus proposed in this thesis with the consideration of the future capacity expansion. In the circuit design of the proposed method, two modules are operated in parallel, where the voltage-controlled inverter is severed as the primary module and the current-controlled inverter is auxiliary module. In the primary module where the two-loop control circuit is employed, the load voltage is well stabilized by outer-loop control circuit and the dynamic response is significantly improved through the inner-loop one. As for the auxiliary module, the current-controlled inverter of this module is applied to reach the current distribution among different modules such that the compensation capacity can be better increased. To operate this proposed system, the voltage-controlled inverter would be integrated with the current-controlled inverter. Then, once the undervoltage signal is detected, the voltage would be compensated immediately such that the waveform at the load side can become more sinusoidal. To validate the feasibility of this proposed approach, this method has been tested through software simulations and hardware implementation. Test results show that the method has reached the goal of power quality improvement and capacity expansion, which are also deemed beneficial for electric power quality study and application
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