- Volume 12 Issue 2
DOI QR Code
Power Flow Study of Low-Voltage DC Micro-Grid and Control of Energy Storage System in the Grid
- Kim, Dong-Eok (KEPCO Research Institute, Korea Electric Power Corporation)
- Received : 2016.06.08
- Accepted : 2016.12.28
- Published : 2017.03.01
DC distribution has several differences compared to AC distribution. DC distribution has a higher efficiency than AC distribution when distributing electricity at the same voltage level. Accordingly, power can be transferred further with low-voltage DC. In addition, power flow in a DC grid system is produced by only a voltage difference in magnitude. Owing to these differences, operation of a DC grid system significantly differs from that of an AC system. In this paper, the power flow problem in a bipolar-type DC grid with unbalanced load conditions is organized and solved. Control strategy of energy storage system on a slow time scale with power references obtained by solving an optimization problem regarding the DC grid is then proposed. The proposed strategy is verified with computer simulations.
DC micro-grid;Bipolar-type DC distribution;DC power flow;Energy storage system
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