The Hardware Design And Protection Logic Research About Device Of Distributed Power Monitoring And Protecting

The direction for the intelligent development of the power system provides a largenumber of parallel operations of the distributed power with an important opportunity. Afterthe distributed power paralleled with the main power grid, it will have an mutual impactwith the main power grid, leading to appear many problems that previously there have beenno. For example, the grid voltage is high or low, which will cause a threat to the equipmentof the distributed power. Furthermore, after that there is a short-circuit fault in the powergrid, if the distributed power will not been promptly removed, it will cause an isolatedisland phenomenon, resulting in serious consequences. Domestic and foreign scholarsalmost focus the research priorities on the distribution network, and neglect to protect thesystem combined with the distributed power and the with distribution network.For the above situation, through the research about the functional requirements after thedistributed power paralleled with the main power grid, the author has developed a set ofmonitoring and protecting device for the distributed power paralleled. On the one hand, as amonitoring device for the distributed power and network, it will send the collected andcalculated data to the SCADA system to inspect. On the other hand, it will take distributedpower lines and its distribution network as a system to protect. The main work is to analyzethe impact on the circuit protection of the main power grid and automatic repeat off, afterthe distributed power paralleled with the main power grid. The paper introduces the designmethods and process of the hardware in details, and which supplies the detailed circuitdiagrams and structure charts. For the different kinds of the distributed power, it analyzesthe technical requirements, and gives the protection criteria and logic diagram of the systemprotection and component protection according to corresponding requirements. Combinedwith the hardware function and the analysis of protection requirements, it gives the wholeidea and frame of the software design. And it establishes the electricity distribution networkmodel, and incorporated the distributed power into the distribution network through thenetwork node, which verifies the reliability of the protection criteria.