Adaptive Control for Parallel-Connected Energy Storage Converters with Line Parameter Mismatch

Wang，Cheng1; Hua，Hongting1; Peng，He1; Wang，Ze2

2021-10-20

10.3389/fenrg.2021.770372

Frontiers in Energy Research   影响因子和分区

2296-598X

Power electronics interfaced microgrid has become a major trend for modern power systems. In this paper, a three-phase microgrid system formed by multiple distributed energy storages (DES) converters is presented. To improve the reliability and flexibility, DESs are connected in parallel to feed the critical loads, and meanwhile, inject real power to the medium voltage (MV) distributed grid and the local dc bus through an interfacing smart transformer (ST). The ST is working at current control mode while the ac bus voltage is regulated in a sharing way through the DESs. However, due to the physical differences and different environment conditions, filter parameters are not likely to be matched for all the DES modules. Accurate load sharing is therefore the first challenging target. Furthermore, both DES module and ST can fail in event of single-point fault. Fast bus voltage restoring thus becomes the second challenging target. In this paper, the parameter mismatch is considered within the system modeling process. A control framework is then presented in form of a virtual current controller and a backstepping adaptive voltage controller. Adaptive laws are designed to fully compensate for the unknown dynamics within the system transient response. Convergence and boundedness of the signals in the closed-loop control system are demonstrated through rigorous Lyapunov-based stability analysis. Simulation results and experimental results are presented and have demonstrated the effectiveness of the proposed algorithm in terms of both fast bus voltage restoring and accurate power sharing.

adaptive control energy storage microgrids paralleled-inverter parameter mismatch

EI

英语

其他

20214511137925

Backstepping ; Closed loop control systems ; Controllers ; DC-DC converters ; Electric current control ; Electric inverters ; Energy storage ; Matched filters ; Transient analysis

Energy Storage:525.7 ; Electric Filters:703.2 ; Electric Components:704.1 ; Control Systems:731.1 ; Specific Variables Control:731.3 ; Control Equipment:732.1 ; Mathematics:921 ; Systems Science:961

2-s2.0-85118640340

Scopus

1.Intelligent Power Conversion Laboratory,Department of Electrical Engineering,Nanjing University of Science and Technology,Nanjing,China
2.Control and Learning for Robotics and Autonomy Laboratory,Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,China

Wang，Cheng,Hua，Hongting,Peng，He,et al. Adaptive Control for Parallel-Connected Energy Storage Converters with Line Parameter Mismatch[J]. Frontiers in Energy Research,2021,9.

Wang，Cheng,Hua，Hongting,Peng，He,&Wang，Ze.(2021).Adaptive Control for Parallel-Connected Energy Storage Converters with Line Parameter Mismatch.Frontiers in Energy Research,9.

Wang，Cheng,et al."Adaptive Control for Parallel-Connected Energy Storage Converters with Line Parameter Mismatch".Frontiers in Energy Research 9(2021).