A Novel Soft-Switching Multiport Bidirectional DC–DC Converter for Hybrid Energy Storage System

Coordinated Control Strategy and Optimization of Composite Energy Storage System Considering Technical and Economic Characteristics

“…The coordinated control strategy and technical economic optimization method will be used in practical engineering as the follow work, and a further research and discussion will be done soon. (n) SOC of ESS at the current moment S ESS(n- 1) SOC of ESS at the previous moment σ ESS Self- …”

“…Taking into account overall adjustment ability optimization, which is the core of proposed coordinated control strategy and the main improvement different from other CESS control strategies [1][2][3][4][5][6][7][8][9][10][11][12][13][14], a contrast strategy without this optimization is set and named base strategy. The filter time constant T f is set as 30 in the base strategy and proposed strategy, and the margin indicator ΔS co,SC is set as 0.35 in the proposed strategy, i.e.…”

“…power allocation, and protection of power limit, over-charge and over-discharge. For the power allocation within CESS considering the complementary characteristics of various ESSs, the rule based method [1,2], fuzzy control method [3], wavelet analysis method [4,5], low-pass/high-pass filtering method [6][7][8][9][10][11][12][13][14] are used to exploit the advantages of various ESSs. Among these methods, the low-pass / high-pass filtering method is most commonly used, and filter time constant can be used to quantify the distribution of power command to each ESS.…”

“…[3,6] to protect the components of CESS. In the intensive study, namely the coordination control of various ESSs, only the literature [12] discusses overcharge and over discharge protection control scheme when the SOC of two ESSs are in the different states, and only the literature [15] describes that the power-type storage remains full charge to satisfy the pulse load in microgrid, and only the literatures [1] and [6] propose that the SOC of power-type storage should be maintained at its intermediate value to maintain a certain power adjustment capability all the time.…”

A Comparison of Non-Isolated High-Gain Three-Port Converters for Hybrid Energy Storage Systems

“…All these issues, which are covered extensively in Section 2, make mandatory a search for simple, high-gain alternatives to interface low voltage ratings storage devices with the DC link [16][17][18]. The most used alternatives in high power applications include complex cascaded schemes (multistage solutions and tapped-inductor topologies), multilevel converters, or galvanically-isolated converters [19][20][21][22][23][24][25]. However, for small power levels, these solutions are not cost-competitive depending on the application.…”