계통 연계형 인버터의 정지좌표전류제어 및외란제거 제어알고리즘 설계
Design of stationary reference frame current and disturbance rejection control algorithms for a grid connected inverter
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본 논문에서는 계통연계인버터용 정지좌표기반 전류제어알고리즘을 제안한다. PI 제어기는 계통 연결 인버터의 전류 제어기로 사용되고 있다. 정지좌표기반 PI 제어기를 사용할 경우, AC 신호 제어로 인하여 정상 상태 오류와 위상지연현상이 발생한다. 본 논문에서는 전향보상기를 추가하여 명령 추적 성능을 높이고 과도 응답을 개선하는 방법을 제안한다. 또한 계통 전압을 외란으로 사용하여 계통 오류 발생 시 시스템을 보호하기 위해 외란을 측정 및 제거하는 제어 방법을 제안한다. 제안된제어 방법은 수학적으로 유도하고 전달 함수로 표현하였으며 시뮬레이션을 통하여 검증하였다
Abstract
This paper presents a grid current control algorithm for a grid connected inverter (GCI) system in a stationaryreference frame. When a Proportional Integral (PI) controller at a stationary reference frame is used in a GCI system,steady state error and phase lags are presented because AC signals are controlled at a stationary reference frame. In thispaper, a feedforward controller is applied to the PI controller to compensate the steady state error and phase lags byimproving command tracking performance. In addition, disturbance rejection control is applied to the PI controller toprotect the GCI system by eliminating disturbance, grid voltage in a GCI system, when a grid fault such as line-to-linefault, happens. The proposed GCI current control algorithm is analyzed in a frequency domain and a simulation model ofthe proposed GCI current control system is developed for verification of the performance
참고문헌 (11)
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