Research Article
Three-Level SOC Equalization Control Strategy for MMC-BESS Based on Feedforward Sliding Window Integral Method
Table 1
MMC-BESS interaction status and energy storage system working mode.
| | MMC-BESS interaction status | DC-DC working mode | Lithium battery charge/discharge status | VT3 | VT4 | Submodule capacitor voltage status | Circuit |
| | pbat = 1 (absorbed power) | Buck mode | Charge | PWM | 0 | Usm > Usmref | Figure 4(a) | | Usm < Usmref | Figure 4(b) |
| | pbat = 1 (output power) | Boost mode | Discharge | 0 | PWM | Usm > Usmref | Figure 4(c) | | Usm < Usmref | Figure 4(d) |
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Note. Usm represents the actual value of the submodule capacitor voltage; Usmref represents the ideal value of the submodule capacitor voltage.
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