| The building of photovoltaic system access to distribution network, bring the distribution network planning, control, operation of the traditional new technical challenges.The study covers the following items:a new islanding detection technology of building photovoltaic system and distribution network relay protection technology in building photovoltaic.The distribution system to access some grid connected inverters, if the implementation of local islanding detection by inverter, it is highly likely to influence each other between inverter and signal detection and conflict, and under certain conditions may fail, therefore in the islanding detection and protection control of inverter cluster must consider the coordination problem between. This project to photovoltaic and distribution network for the overall research goals, and demonstration engineering applications of this background provides a platform for the implementation of the remote island detection. The remote island detection is completed by the distributed monitoring unit in distribution network of each key point, through the communication channel to send to the control mechanism of the island in the inverter. At the same time, in order to ensure the communication failure condition of photovoltaic will still be able to timely exit operation, also need to carry out local islanding detection through the inverter controller and ensure no mutual influence cluster.Distributed photovoltaic system access to distribution network, power flow direction increased uncertainty. Distributed power supply for the current distribution network short circuit fault will help increase and reduction functions, leads to protect desensitization or malfunction. Comprehensive analysis shows that, change the protection action curve method for in juPVment which is difficult to meet the distributed photovoltaic system access after the distribution network protection requirements, need to be further studied. |
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