A method for evaluating the energy efficiency of micro-energy grids with AC-DC hybrid micro-grids as the core
An AC/DC hybrid and micro-grid technology, applied in data processing applications, system integration technology, instruments, etc., can solve the problems of multiple levels of energy conversion, complex multi-energy flow coupling, and complicated conversion forms, so as to improve the reliability of power supply, The effect of improving the support ability
Active Publication Date: 2022-06-24
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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[0005] However, while micro-energy grids provide energy services with diverse modes, they also face problems such as multiple levels of energy conversion, complicated conversion forms, and complex multi-energy flow coupling. There is an urgent need for an energy efficiency evaluation of micro-energy grids with AC-DC hybrid micro-grids as the core. Index system, systematically evaluates the energy efficiency of micro-energy network and comprehensive energy, realizes multi-energy complementarity of electricity, gas, cooling and heat, optimizes the interaction of source, network, load and storage, and improves the overall economy of the system
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[0081] like Figure 1-5 As shown, taking an AC-DC hybrid microgrid as an example, the rated operating voltage of the microgrid is 380V, the line voltage amplitude is 537V, and the rated operating power is 400kW. The capacity of the AC sub-microgrid energy storage device is 300kW / 2h, the DC sub-microgrid energy storage battery capacity is 100kW / 2h, the batteries are all lithium iron phosphate batteries, the rated operating current of the microgrid is 607.8A, and the current amplitude is 859.7A. The micro-energy network includes a ground source heat pump heating / cooling device. The ground source heat pump includes a screw heat pump unit with a rated cooling capacity of 630kW and a power consumption of 104kW; the rated heat generation is 550kW, and the power consumption is 163kW. The rated heating efficiency is 0.8. The reliability of the power supply in the installation area of the micro-energy grid is 99.82%, the switching time of the micro-grid on and off the grid is 30ms, ...
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The invention relates to an energy efficiency evaluation method of a micro-energy network with an AC-DC hybrid micro-grid as the core, and evaluates the system energy efficiency of the micro-energy network through structural flexibility indicators, energy conversion rate indicators, system responsiveness indicators and system support indicators. The present invention designs a micro-energy grid energy efficiency evaluation index system with AC-DC hybrid micro-grid as the core, which covers multiple index systems and has a wide range of applications. The invention fully considers various power emergency response modes, realizes the evaluation of the emergency response capability of active power and reactive power in an emergency state, and improves the support capability of the system to the large power grid.
Description
technical field [0001] The invention belongs to the field of distributed power supply, energy storage and comprehensive energy, and particularly relates to an energy efficiency evaluation method for a micro-energy grid with an AC-DC hybrid micro-grid as the core. Background technique [0002] With the development of my country's economy and society, industrial parks, vast rural areas, and cities have an increasing demand for efficient, clean, and economical energy services such as power supply, heating, cooling, and gas supply. On the one hand, the explosive growth of distributed power sources needs to be efficiently consumed locally to solve the problem of grid connection; Crucial to the vast rural areas. The "coal-to-gas" project promoted by my country has brought high consumption while increasing the difficulty of energy security; the "coal-to-electricity" project has solved the problems of energy security and environmental pollution, but its consumption is still higher ...
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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/06393G06Q50/06Y04S10/50
Inventor 孟良李铁成胡文平周文苏灿杨少波胡雪凯李宣义
Owner STATE GRID HEBEI ELECTRIC POWER RES INST