Abstract
As a supplement of large power grid and known as the new energy, distributed generation (DG) are developing rapidly for its convenience and environmental protection. However, after DG is connected to the distribution network, the traditional single-source radial-network will become to be a double terminal or multi-terminal power network, and the direction of the trend will change, too. This will bring a series of problems to the relay protection, such as misoperation and malfunction. Based on this, the paper analyzes the effect on protection of distribution network in different places with the DG connected. By using the electromagnetic transient simulation software PSCAD/EMTDC, this paper builds the typical model of 10kV distribution network to tests the theoretical analysis further. Finally the conclusion are obtained.
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