Improvement of PLL Method for Voltage Control of Dynamic Voltage Restorer

동적전압보상기의 전압제어를 위한 PLL 방식의 개선

  • 김병섭 (경북대 전기공학과) ;
  • 최종우 (경북대 전자전기컴퓨터학부)
  • Published : 2009.05.01

Abstract

Dynamic voltage restorer(DVR) is now more preferable enhancement than other power quality enhancement in industry to reduce the impact of voltage faults, especially voltage sags to sensitive loads. The main controllers for DVR consists of PLL(phase locked loop), compensation voltage calculator and voltage compensator. PLL detects the voltage faults and phase. Compensation voltage calculator calculates the reference voltage from the source voltage and phase. With calculated compensation voltage from PLL, voltage compensator restores the source voltage. If PLL detect ideal phase, compensation voltage calculator calculates ideal compensation voltage. Therefore, PLL for DVR is very important. This paper proposes the new method of PLL in DVR. First, the power circuit of DVR system is analyzed in order to compensate the voltage sags. Based on the analysis, new PLL for improving transient response of DVR is proposed. The proposed method uses band rejection filter(BRF) at q-axis in synchronous flame. In order to calculate compensation voltage in commercial instruments, the PQR theory is used. Proposed PLL method is demonstrated through simulation using Matlab-Simulink and experiment, and by checking load voltage, confirms operation of the DVR

Keywords

DVR(Dynamic Voltage Restorer);PLL(Phase Locked Loop);PQ theory;Voltage controller;Voltage sag;Voltage swell

References

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