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스마트 인버터의 자율적인 Volt-VAR 곡선 변경을 통한 연계점 전압의 안정화
이교범,차지윤,김현진,맹창엽 대한전기학회 2022 전기학회논문지 Vol.71 No.4
This paper proposes a method of stabilizing a point of common coupling (PCC) voltage using an autonomous Volt-VAR curve change in smart inverters. When the interconnection capacity of distributed energy resources rapidly increases, the problem of a reverse power flow occurs and the PCC voltage becomes unstable. The smart inverter which is a grid-connected inverter for distributed energy resources performs Volt-VAR control in oder to stabilize the unstable PCC voltage. The smart inverter autonomously changes the Volt-VAR curve according to the PCC voltage. The smart inverter uses Volt-VAR curve with a larger slope if the PCC voltage is not stabilized when the Volt-VAR curve with a small slop is used. The Volt-VAR curve is maintained if the PCC voltage is stabilized using the Volt-VAR curve. The validity of the proposed method is verified by the simulation results and experimental results
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직렬 통신 기능을 이용한 대용량 계통연계형 인버터의 순환전류 저감방법
이교범,전세봉,조성준 대한전기학회 2021 전기학회논문지 Vol.70 No.6
This paper proposes a circulating current suppression method of grid-connected inverters in parallel inverters using serial communication. The grid-connected inverter for large scale photovoltaic generation system consists of multiple modules in parallel based in unit inverter module. The existing method to synchronize PWM signals between inverter modules was implemented by CAN communication with high interrupt priority. However, the high priority of CAN communication can cause deterioration in current control performance due to limited resource of controller. This paper introduces an improved synchronization method of PWM signals with low interrupt priority using time stamp function. The effectiveness of the proposed method is verified by experimental results with 250kW inverter system
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