Tie-Line Power Flow Control Strategy for a Grid-Connected Microgrid Containing Wind, Photovoltaic and Battery
- Publication Type:
- Journal Article
- Citation:
- Diangong Jishu Xuebao/Transactions of China Electrotechnical Society, 2017, 32, (15), pp. 169-179
- Issue Date:
- 2017-08-10
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| 19505076_8796670600005671.pdf | 6.39 MB |
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In an active distribution network environment, the intermittent and random renewable generation units, such as small wind generation, photovoltaic(PV), and energy storage unit, e.g. battery, can be combined to form a microgrid (MG). The microgrid can be controlled as a generator or a load with a timed constant power flow by coordinating the power output of its multiple renewable generation units. This way is helpful for the active distribution network to dispatch and manage the microgrid group and to promote the penetration of distributed renewable energy sources. A hierarchical coordination control strategy is employed by considering the change of wind speed and solar radiation intensity as well as the limited storage capacity. A method to calculate the expected interchange power plow of the microgrid tie-lineaccording to predicted wind speed and solar radiation intensity in each time period is presented. A central controller is designed to formulate the plan of microgrid tie-line interchange power plow with the dispatch center of the active distribution network by communicating with upper active distribution grid center. The central controller can also select the correct operation modes and achieve the smooth switch between different operation modes, to select and manage the local controllers. The hierarchical control strategy realizes the seamless transformation of the running state, and ensures the output power flow of the microgrid to follow the demand of the tie-line interchange power. When the difference between the sum of output instantaneous power of wind generation, PV in the microgrid and tie-line interchange power plow is big, the microgrid may partly abandon the generation active power of wind and PV power generation. A simulation model of wind/PV/battery microgrid is established and the simulation results confirm the effectiveness of the proposed control strategy.
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