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A SOC self-balancing modulation method for energy storage system
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A technology of an energy storage system and a modulation method, which is applied in the field of energy storage systems and can solve problems such as unbalanced state of charge
Active Publication Date: 2021-01-15
GUANGDONG UNIV OF TECH
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Problems solved by technology
[0005] The present invention aims to overcome the problem that the state of charge (SOC) imbalance will occur between the various battery packs used to provide DC power when the level converter described in the above prior art is used for grid-connected power generation of the energy storage system, Provide a SOC self-balancing modulation method for an energy storage system
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Embodiment 1
[0083] This embodiment provides a multilevel converter of an energy storage system, such as Figure 8 As shown, the multilevel converter includes: n battery packs: BAT1, BAT2...BATn;
[0084] 2n P-channel enhancement MOS transistors: S1, S2...Si...Sn, P1, P2...Pi...Pn;
[0086] Common end: connection point SP1, connection point SP2... connection point SPi... connection point SPn, connection point SB1, connection point SB2... connection point SBi... connection point SBn-1, connection point QQ1, connection point QQ2;
[0087] The drain of Si is connected to the connection point SBi-1, and the source of Si is connected to the connection point SPi;
[0088] The positive pole of BATi is connected to the connection point SPi, and the negative pole of BATi is connected to the connection point SBi;
[0089] The drain of Pi is connected to the connection point SPi, and the source of Pi is connected...
Embodiment 2
[0122] This embodiment provides an SOC self-balancing modulation method for an energy storage system, the energy storage method is applied to the multilevel converter of the energy storage system described in Embodiment 1,
[0123] with +e 1 The corresponding triangular carrier strength when it is 1 level, the output voltage strength is +E, +e 2 The corresponding triangular carrier strength when it is 2 levels, the output voltage strength is +2E, +e 3 The corresponding triangular carrier strength when it is 3 levels, the output voltage strength is +3E, +e 4 The corresponding triangular carrier strength when it is 4 levels, the output voltage strength is +4E;
[0124] -e 1 The corresponding triangular carrier strength when it is -1 level, the output voltage strength is -E, -e 2 The corresponding triangular carrier strength when it is -2 level, the output voltage strength is -2E, -e 3 It is the triangular carrier intensity corresponding to the -3 level, and the output volta...
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Abstract
The invention provides a multilevel converter of an energy storagesystem and an SOC self-equalization modulation method. A circuit is composed of a plurality of battery modules and an H-bridge converter, each battery pack is provided with three power switching devices, and the switching devices in each battery module work at a higher switching frequency so as to provide the required output voltage. The H-bridge converter works at the power grid frequency and is only used for changing the polarity of the output voltage. On a topological structure, three power switch devices are configured foreach battery pack, and the flexible series-parallel connection switching between the battery packs is realized, so that the converter can output multiple levels. According to the modulation method, asmany battery packs as possible are operated in parallel when the output voltage is lower, and the SOC automatic equalization among the battery packs is achieved while the internal resistance loss ofthe batteries is reduced.
Description
technical field [0001] The present invention relates to the field of energy storage systems, and more specifically, to an SOC self-balancing modulation method of an energy storagesystem. Background technique [0002] Multilevel converters have the advantages of small switching stress, high output voltage, low harmonic content, and easy expansion, and are an effective solution for connecting large-scale energy storage systems to the grid. Existing multilevel converters mainly include three topologies, namely, diode-clamped multilevel converters, flying capacitor multilevel converters, and cascaded multilevel converters. Among them, the cascaded multilevel converter has a simple topology and working principle, and is easy to expand to the required number of levels through series connection, and has been widely used. [0003] by figure 1 and figure 2 As an example, to illustrate the topology of cascaded multilevel converters. figure 1 It is a traditional cascaded 7-level ...
Claims
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