A DC microgrid system based on supercapacitor
A DC microgrid and supercapacitor technology, applied in the field of microgrids, can solve problems such as power fluctuations and affect the stability of microgrids, and achieve the effects of increasing the number of connections, increasing the proportion of new energy, and eliminating uncertainty.
Active Publication Date: 2022-05-10
江苏和网源电气有限公司
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Therefore, the current DC microgrid is prone to power fluctuations in grid-connected mode or off-grid mode, or when switching between grid-connected and off-grid modes, which affects the stability of the microgrid.
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[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0032] In the traditional control strategy, in the grid-connected mode, the bus voltage of the microgrid is always directly dominated by the grid voltage or indirectly dominated by the power converter; there is an uncertain power exchange between the microgrid and the distribution network, making the power The power dispatching of the system is complex, which makes the ...
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The invention provides a supercapacitor-based DC microgrid system, including a DC bus, a supercapacitor, an energy storage battery pack, an auxiliary power generation unit, a distributed new energy power generation unit, a local load, and a microgrid control center; the supercapacitor , an energy storage battery pack, an auxiliary power generation unit, a distributed new energy power generation unit, a local load, and a microgrid control center are respectively connected to the DC bus, and the DC bus is connected to the distribution network; the microgrid control center respectively controls The power flow between the supercapacitor, the energy storage battery group and the auxiliary power generation unit and the DC bus, and the power flow between the DC bus and the distribution network. The invention uses the supercapacitor as the only and continuous voltage source to absorb high-frequency power fluctuations in the DC microgrid, and can effectively suppress voltage fluctuations and surge currents at the moment of switching between the grid-connected mode and the off-grid mode.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of micro-grids, and more specifically, relate to a DC micro-grid system based on supercapacitors. Background technique [0002] The extensive use of renewable energy can not only link the current energy crisis, but also greatly reduce the emission of pollutants, and can achieve better energy-saving and emission-reduction benefits. Renewable energy power generation units have shortcomings such as unstable power generation. Therefore, energy storage systems have become an important part of distributed power generation systems that use solar energy and wind energy as the main energy source, that is, microgrid systems, and have important research significance. [0003] At present, my country has clearly proposed to vigorously build new energy micro-grid demonstration projects, and the micro-grid system has entered a stage of rapid development in my country. my country's microgrid system cu...
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IPC IPC(8): H02J1/00H02J1/10H02J1/14H02J7/34
CPCH02J1/00H02J1/10H02J1/14H02J7/345
Inventor 林永清焦道海
Owner 江苏和网源电气有限公司