Abstract
Small hydropower station, when producing power energy to power system through the distribution network, may lead to the change of the detected current in relay protection and the protection coverage. In this paper, IEEE7 based network is formed in the platform of PSCAD/EMTDC to analyze the effects of distribution network in current protection when a small hydropower station is linked in. The running of relay protection in Section I and II is simulated to obtain the difference of current variation of network with or without small hydropower station. Also the key parameters are calculated to point out the maximum generation capacity of the small hydropower station in case of reliable and sensitive current protection.
Highlights
Small hydropower station, when producing power energy to power system through the distribution network, may lead to the change of the detected current in relay protection and the protection coverage
The widely distributed stations result in weak connectivity of the power sources which is quite different from power grid in relay protection
If the small hydropower station is not linked to the distribution network, when fault occurs, the short-circuit current flowing through P1, P2 and P3 is:
Summary
When the distribution network fails at point F2 in the downstream, the network is simplified to Fig. with ignoring the feeder 2. Es C is to the system voltage, which the small hydropower station is linked
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