An Improved Distributed Secondary Control Strategy for Battery Storage System in DC Shipboard Microgrid

Zeng, Yuji; Zhang, Qinjin; Liu, Yancheng; Zhuang, Xuzhou; Lv, Xu Jun; Wang, Honglai

doi:10.1109/tia.2022.3153755

Cited by 34 publications

(10 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From (15), the fictitious resistance Rvi is designed as a dynamic function based on SoC information, which plays a decisive role in SoC convergence and load current regulation. To explore the rationality of Rvi, we assume that Cbi=1Ah, Sai=Dai=0.5.…”

Section: Fictitious Resistance and Convergence Factor Analysismentioning

confidence: 99%

“…Since the voltage and current control of the main control layer can respond quickly, its closed-loop transfer function can be approximated as [15]:…”

Section: Global Steady-state Analysismentioning

confidence: 99%

“…However, this method requires a complex and expensive centralized communication network to realize information exchange between BSSs, which easily leads to a single point of failure problem. Considering the system communication burden, a distributed cooperative control framework is constructed in [14]- [15], which achieve SoC balancing, current sharing, and voltage restoration only with neighbor-to-neighbor communication network. However, the introduction of multiple secondary controllers would increase the system order, which is not conducive to the stable system operation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Distributed Unified Controller Design for Parallel Battery Storage System in DC Shipboard Microgrid

Zeng

Zhang

Liu

et al. 2024

IEEE Trans. Power Syst.

Self Cite

View full text Add to dashboard Cite

In this paper, a novel distributed unified controller is designed to solve the problems of unbalanced State of Charge (SoC), unreasonable load current sharing, and unstable DC bus voltage for parallel battery storage systems (BSSs) in DC shipboard microgrid (DC-SMG). Different from the droop-based secondary controller, the designed distributed unified controller is a droop-free primary controller, which can incorporate SoC balancing, current sharing, and voltage regulation functions in the primary control layer. On this basis, each BSS uses an improved dynamic diffusion algorithm (DDA) to iteratively estimate the average information, and completes information exchange by a neighbor-to-neighbor communication network. Furthermore, the small-signal stability, large-signal stability, and global steady-state performance of the system is investigated using eigenvalue analysis, mixed potential theory (MPT), and matrix theory, respectively. Finally, the Matlab/Simulink simulation model and the StarSim HIL experimental platform for DC-SMG are built. The results show that the designed distributed unified controller can simultaneously achieve dynamic SoC balancing, proportional load current sharing, and smooth average bus voltage regulation, and has a faster SoC convergence speed and more stable control effect than the state-of-the-art methods.

show abstract

Section: Fictitious Resistance and Convergence Factor Analysismentioning

confidence: 99%

“…Since the voltage and current control of the main control layer can respond quickly, its closed-loop transfer function can be approximated as [15]:…”

Section: Global Steady-state Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Distributed Unified Controller Design for Parallel Battery Storage System in DC Shipboard Microgrid

Zeng

Zhang

Liu

et al. 2024

IEEE Trans. Power Syst.

Self Cite

View full text Add to dashboard Cite

show abstract

“…But power losses are also neglected for SoC estimation. Through sparse communication, three-layer hierarchical control schemes [18,19] have been presented to cope with the issues of bus voltage deviation and inconsistent line resistances. But additional balancing factors [18] or control loops [19] require an elaborate design to ensure system stability.…”

Section: Introductionmentioning

confidence: 99%

Fast State-of-Charge-Balancing Strategy for Distributed Energy Storage Units Interfacing with DC–DC Boost Converters

Duan,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

State-of-charge balance is vital for allowing multiple energy storage units (ESUs) to make the most of stored energy and ensure safe operation. Concerning scenarios wherein boost converters are used as the interfaces between ESUs and loads, this paper proposes a balancing strategy for realizing consistent state-of-charge (SoC) levels and equal currents among different ESUs. This strategy is valid for both parallel and series applications. Its advantages also include its high precision of SoC equalization without extra sensors and fast convergence. A common outer voltage loop is used to accomplish tight voltage regulation, while multiple inner current loops are utilized to achieve current control and SoC balance simultaneously. Firstly, by introducing SoC-based current distribution ratios (CDRs) to modify current references online, the currents are gradually adjusted to eliminate SoC deviations. Secondly, to expedite the balancing process, current saturations are further adopted. Thirdly, the influences of accelerating factor and current limits in CDR expressions are analyzed, and their selection guidelines are subsequently provided. Fourthly, the controller design, consisting of a dual loop, is illustrated to guarantee sufficient stability margins. Fifthly, an experimental platform consisting of three battery ESUs is developed to verify the proposed strategy.

show abstract

“…For example, Chen et al proposed a distributed cooperative secondary control for electric spring, and to achieve SoC balance, a state variable related to the battery SoC is defined and it varies when BESSs switch between charging and discharging modes [16]. Zeng et al proposed a novel consensusbased SoC balance algorithm for DC shipboard microgrids [17]. Hu et al proposed a secondary control strategy with four controllers, including a current-sharing controller, a SoC balance controller, a virtual impedance correction controller, a local reference voltage controller, they collectively achieve voltage regulation and SoC balance [18].…”

Section: Introductionmentioning

confidence: 99%

Distributed Secondary Control of Battery Storage Systems in DC Microgrids with A Virtual State Variable

Su¹

2022

Preprint

View full text Add to dashboard Cite

<p>To simultaneously achieve average voltage regulation, accurate current-sharing and state-of-charge (SoC) balance, at least two state variables need to be transmitted between neighboring BESS nodes in conventional distributed secondary control. This paper proposes a distributed secondary control for BESSs in DC microgrids with the information of only one virtually defined state variable being transmitted. This virtual state variable combines the BESS converter output current and SoC, and a new voltage controller together with a new consensus-based current and SoC controller are designed all based on its information. Further, there is no need to change the control law when BESSs switch between charging/discharging modes with the designed current and SoC controller. Once SoCs are balanced, it works purely as a current controller. Stability and steady-state analysis are conducted to confirm the effectiveness of the proposed control strategy. Finally, three case studies assisted with hardware-in-loop (HIL) real-time tests are presented to validate the proposed control strategy.</p>

show abstract

An Improved Distributed Secondary Control Strategy for Battery Storage System in DC Shipboard Microgrid

Cited by 34 publications

References 24 publications

Distributed Unified Controller Design for Parallel Battery Storage System in DC Shipboard Microgrid

Distributed Unified Controller Design for Parallel Battery Storage System in DC Shipboard Microgrid

Fast State-of-Charge-Balancing Strategy for Distributed Energy Storage Units Interfacing with DC–DC Boost Converters

Distributed Secondary Control of Battery Storage Systems in DC Microgrids with A Virtual State Variable

Contact Info

Product

Resources

About