CAJ | 학술논문

根据微电源类型的不同,其入网接口方式也可分为两种:电压源型逆变器(Voltage Source Inverter, VSI)接口和同步电机(Synchronous Generator,SG)接口.设计了一种包含这两种接口方式的微网控制策略.VSI 接口采用针对有功功率限值的设定进行改进的下垂控制策略,并添加相应滤波装置使得控制更加精准.SG 接口在下垂控制策略基础上改进输出所需机械功率及励磁电压驱动电机运行.二者之间无需复杂的通信环节,可实现功率输出自我调整,并使微网系统稳定在电能质量允许的范围内.为实现微网与大电网的无缝转接,设计静态开关(Static Switch, SS)使得电网、SG 接口的微电源、VSI 接口的微电源在彼此电压接近同频同相时接通.仿真算例验证了微网控制策略及静态开关设计的有效性.
근거미전원류형적불동,기입망접구방식야가분위량충:전압원형역변기(Voltage Source Inverter, VSI)접구화동보전궤(Synchronous Generator,SG)접구.설계료일충포함저량충접구방식적미망공제책략.VSI 접구채용침대유공공솔한치적설정진행개진적하수공제책략,병첨가상응려파장치사득공제경가정준.SG 접구재하수공제책략기출상개진수출소수궤계공솔급려자전압구동전궤운행.이자지간무수복잡적통신배절,가실현공솔수출자아조정,병사미망계통은정재전능질량윤허적범위내.위실현미망여대전망적무봉전접,설계정태개관(Static Switch, SS)사득전망、SG 접구적미전원、VSI 접구적미전원재피차전압접근동빈동상시접통.방진산례험증료미망공제책략급정태개관설계적유효성.
Based on the different types of Microsources, the interfaces of the microsources can be divided into two types: voltage source inverter (VSI) interface and synchronous generator interface. This paper proposes the control strategy of AC Microgrid which contains the two interfaces. The VSI interface adopts the improved droop control strategy by considering active power limit and adding filters to make the control more accurate. The SG interface modifies the droop control strategy to get the mechanical power and filed voltage to drive the SG. There is no need about communication between the SG and VSI, and the two interfaces can adjust their active power output autonomously and the microgrid system will reach balance within the limit of power quality demands. To achieve the continuous connection between the microgrid and grid, the static switch is designed to make the microgrid connect with the grid when the voltages have nearly the same frequency and amplitude. The simulation results testify the effectiveness of the proposed control strategy and SS.