Resonance demagnetization-based two-way forward battery energy storage system
A battery energy storage system and forward technology, applied in the field of energy storage systems, can solve the problems of large current stress and high cost of devices, achieve the effect of reducing requirements, reducing design and production costs, and improving the efficiency of the whole machine
Active Publication Date: 2018-02-16
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
[0005] In view of the above problems, the purpose of the present invention is to provide a bidirectional forward battery energy storage system based on resonance demagnetization to solve the problem of all the charging and discharging currents of the switching devices flowing through the battery modules in the existing full-power modular flexible grouping system As a result, the current stress of the device is large and the cost is high. At the same time, the resonance technology is also used to complete the corresponding demagnetization requirements.
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[0044] figure 1 The construction topology diagram of the two-way forward battery energy storage system based on resonance demagnetization disclosed in this embodiment is given, as shown in figure 1 As shown, the construction topology scheme diagram of the battery energy storage system based on resonance demagnetization disclosed in this embodiment includes: isolated forward converter unit, battery unit, grid-connected main power converter and three-phase alternating current, through grid-connected main The power converter and the isolated forward converter unit perform partial power independent current control on the battery cells.
[0045] figure 2 The main circuit diagram of the battery energy storage system based on resonance demagnetization disclosed in this embodiment is given, as shown in figure 2 As shown, the battery energy storage system includes:
[0046] A battery unit 100, the battery unit includes several groups of battery modules 110 connected in series;
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The invention discloses a resonance demagnetization-based two-way forward battery energy storage system, which comprises a battery unit, a grid-connected main power converter and an isolated forward converter unit, wherein the battery unit comprises multiple groups of battery modules connected in series; the grid-connected main power converter is used for controlling main current of the battery unit, and is connected with the battery unit in parallel and connected to a three-phase AC power grid; the isolated forward converter unit comprises multiple isolated forward converters with the same structure connected in series; and the isolated forward converter unit is correspondingly connected with each group of battery modules separately, carries out closed-loop independent current control separately and is used for controlling a difference value between charging and discharging current of each group of battery modules and the main current. Independent control on different current parts ofthe battery modules is achieved through the grid-connected main power converter and the isolated forward converter unit, independent control on the current of all batteries is not needed, the demagnetization requirements are completed by using the structure characteristics of a forward circuit, the structure is simple, the design cost is reduced, two-way work is flexibly achieved, and the energyutilization rate of the battery modules is improved.
Description
technical field [0001] The invention relates to the fields of energy storage systems and power electronic converters, in particular to a bidirectional forward battery energy storage system based on resonance demagnetization. Background technique [0002] In recent years, the proportion of new energy power generation such as wind energy and solar energy in my country's power system has gradually increased. Due to the intermittent and fluctuating characteristics of new energy power generation, after the new energy power generation is integrated into the grid, many problems have been caused to the grid connection. However, the battery energy storage system has become one of the best technologies to meet the challenge because of its ability to smooth intermittent power fluctuations, and can improve the energy utilization rate of the entire grid. [0003] The existing modular battery energy storage system usually adopts a full-power independent control type flexible group energy s...
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IPC IPC(8): H02J3/32H02M3/335
CPCH02J3/32H02M3/33569Y02E40/10Y02B70/10
Inventor 康龙云吴璟玥冯元彬王则沣
Owner SOUTH CHINA UNIV OF TECH