Monitoring system for distributed power supply connection and power distribution network integration protection method

Abstract

The invention discloses a monitoring system for distributed power supply connection and a power distribution network integration protection method. The monitoring system comprises a distributed power supply monitoring module, a grid-connection monitoring module, a regulating and controlling module and an advanced application module; the power distribution network integration protection method comprises the following steps: (1), calculating a power distribution network current protection constant value when the distributed power supply connection is counted and calculating a power distribution network current protection constant value when the distributed power supply connection is not counted separately; and (2), loading the two sets of the power distribution network current protection constant values obtained in the step (1) into the grid-connection monitoring module, and judging whether the two sets of the constant values stratify a detection limited condition or not. The monitoring on the distributed power supply in connection to the existing power grid can be rapidly and conveniently realized, so that the distributed power supply distribution information integration can be realized to eliminate information isolated island and to realize the intelligentized integration and the sharing of the distributed power supply applications; and in addition, in the overall adjustment for the power distribution network current protection by the power distribution network integration protection method, the influences on the power distribution network current fault characteristics after the distributed photovoltaic power supplies of different capacities are connected are taken into considerations.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a monitoring system for accessing distributed power sources and an integrated protection method for distribution networks. Background technique [0002] Distributed generation (DG) makes full use of renewable energy, has good environmental friendliness, and has become an important form of electric energy. For the power distribution system with distributed power, due to the randomness of its power output, it will make it difficult to set the fixed value of the traditional current protection. Existing methods mainly include limiting the access scale of distributed power sources or prohibiting reverse current, and adopting methods such as longitudinal protection based on communication channels such as optical fibers (such as optical fiber longitudinal differential protection). The above method is not in line with the national policy of supporting distributed power access to...

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Problems solved by technology

However, if a large number of distributed power generation is connected t

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