Full
Outline
The use of traditional constant balance coefficient for the state-of-charge (SOC) of batteries cannot reach a compromise between the balancing speed and circulating current. To overcome this limitation, an adaptive balance optimization control strategy for battery SOC is proposed, which is based on modular multilevel converter-battery energy storage system (MMC-BESS). A detailed analysis of the power components within the MMC-BESS bridge arm is given, and the design of an SOC equalization controller based on direct control of battery power on the DC-DC side is optimized. A standard deviation factor based on a constant proportional balance coefficient is introduced, and the interphase-interarm-intraarm cascaded SOC balance algorithm is improved, which can adaptively determine the proportional balance coefficient according to the SOC difference in each module. In addition, a feedforward control quantity is added to the outer power loop of the DC-DC controller, so as to improve the response speed of battery power charging and discharging. The simulation results based on MATLAB/Simulink show that the proposed SOC balance control strategy can reduce the circulating current at the initial stage of balance and shorten the total balance time.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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