Abstract
A frequency control approach based on wind power and load power prediction information is proposed for wind-diesel-battery hybrid power system (WDBHPS). To maintain the frequency stability by wind power and diesel generation as much as possible, a fuzzy control theory based wind and diesel power control module is designed according to wind power and load prediction information. To compensate frequency fluctuation in real time and enhance system disturbance rejection ability, a battery energy storage system real-time control module is designed based on ADRC (active disturbance rejection control). The simulation experiment results demonstrate that the proposed approach has a better disturbance rejection ability and frequency control performance compared with the traditional droop control approach.
Highlights
Remote Area Power Supply (RAPS) systems which are used to supply power for rural and remote areas, including island, could not rely on the main grid supply system
If the prediction information could be taken into account in frequency control, the active power output of wind turbine and diesel generator could be regulated to reduce the frequency deviation caused by wind power and load fluctuation
This paper proposed a load and wind power prediction based frequency control approach for wind-diesel-battery hybrid power system
Summary
Remote Area Power Supply (RAPS) systems which are used to supply power for rural and remote areas, including island, could not rely on the main grid supply system. Most above frequency control approaches only use BESS to compensate the frequency deviation caused by wind power and load fluctuation and maintain power-load balance by diesel generator. Very few of them consider regulating the active power output of wind turbine to reduce frequency fluctuation They did not utilize prediction information of wind power and load to stabilize WDBHPS’s frequency. If the prediction information could be taken into account in frequency control, the active power output of wind turbine and diesel generator could be regulated to reduce the frequency deviation caused by wind power and load fluctuation. A wind power and load prediction based frequency control approach is proposed for WDBHPS In this approach, a fuzzy control based wind and diesel power control module is used to reduce frequency deviation by wind turbine and diesel generator according to the wind power and load prediction information. To overcome the draws of traditional droop control, such as difficulty of droop coefficient adjusting, static error of frequency control, and poor disturbance rejection ability, an ADRC based real-time control module of BESS is used to compensate the real-time frequency fluctuation
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