그리드포밍 인버터의 계통 주파수 안정도 기여 향상을 위한 새로운 가상동기발전기 기반 전력제어 방법

초록

As the penetration of renewable energy sources increases and the inertia of the power system decreases, frequency instability in the grid is a possibility. Furthermore, power electronic converters can induce various resonance instabilities in the power grid. Recently, research on grid-forming inverters, which emulate the dynamic characteristics of synchronous generators and provide inertia and damping to the power system, is actively being conducted. This paper conducts modeling of a grid-forming inverter for resonance stability analysis and controller design and proposes a novel control strategy that not only emulates the characteristics of synchronous generators but also improves the frequency nadir through faster primary frequency response compared with conventional grid-forming inverters by combining PI and IP controller.

키워드