A quintuple phase shift modulation scheme in multilevel dual active bridge converter for battery energy storage system

Abstract

Generally, the dual active bridge (DAB) bidirectional DC-DC converter suffers from harmonics in the high-frequency link (HFL) conversion stage while operating under any modulation scheme. This paper proposes a quintuple phase shift (QPS) modulation scheme to suppress the harmonics under the whole operating range. A bidirectional auxiliary switch in the low voltage bridge produces a five-level output, which alleviates harmonic components of HFL current. The total harmonic distortion (THD) analysis is done for various operating conditions and is compared with the conventional modulation scheme, such as single phase shift and dual phase shift. The THD can be reduced in the entire power transmission for the proposed modulation scheme by defining the suitable phase shift ratios. Also, the power flow analysis under QPS modulation is reported in this paper. To validate the proposed approach's theoretical performance, simulation results are obtained under different operating conditions and verified with experimental results. The QPS modulation is implemented using the Spartan 3AN FPGA processor.

PSO based universal phase shift modulation scheme for DAB converter to eliminate backflow power in energy storage applications

“…Generally, isolated bidirectional DC-DC converters are utilized to interconnect the batteries to the system, and the most popular one is the dual active bridge (DAB) converter. [11][12][13] The DAB converters are widely accepted due to the proven advantages of concise size, capability to handle large power, zero voltage switching (ZVS) attribute, and increased power density with galvanic isolation. Further, the performance of DAB is enhanced by the phase shift control approach 14 due to the easiness of implementation, reduction in switching loss at fundamental frequency operation, enhancement in ZVS operation, and non-active power flow control within the converter.…”

“…Otherwise, an uneven chemical reaction rate causes dendrites' development, leading to the battery's internal short circuit. Generally, isolated bidirectional DC‐DC converters are utilized to interconnect the batteries to the system, and the most popular one is the dual active bridge (DAB) converter 11–13 …”

Efficiency improvement of dual active bridge converter using simple graphical optimization method

“…Based on the research of previous works, a three control degrees modulation TPS 8 is proposed. Since there are three control degrees in TPS, more optimization targets are introduced such as zero voltage switching (ZVS) for all switches, 9–11 eliminating the non‐active power 12–14 and DC bias 15,16 . That is the reason why the TPS modulation is a more general modulation for DAB converter 17 …”