A Study of Voltage Detection Based Fault Judgement Method in Micro-grid with Inverter Interfaced Power Source
Micro-grid can operate in connection with distribution network or in islanded mode. In islanded operation mode, conventional protection techniques based on over-current have certain limitations and are no longer suitable, because the inverters are designed to limit the output current to protect their devices. Then new techniques have to be explored. In this paper, a new fault judgement method based on detecting voltage variation is proposed, and it can provide reliable and fast detection for different types of fault within the micro-grid. The voltages in the micro-grid are measured and transformed into DC quantities by using the d-q reference frame. Any variation of voltage in the micro-grid caused by the fault in the grid, whatever symmetrical and unsymmetrical fault, will be reflected as deviation of voltage in the d-q reference frame. The waveform of the voltage variation is used to detect the fault type and locate the fault region. The voltage characteristic and corresponding variation on d-q reference frame are analyzed for different types of fault within the micro-grid. The simulation results indicate the feasibility of the fault judgement method based on voltage detection.
Micro-grid distributed generation fault judgement d-q transformation positive sequence
Chaoyong Hou Xuehao Hu
China Electric Power Research Institute, Beijing 100192, China
国际会议
The International Conference on Electrical Engineering 2009(2009 电机工程国际会议)
沈阳
英文
1-5
2009-07-05（万方平台首次上网日期，不代表论文的发表时间）