In order to improve the low-frequency stability of photovoltaic integration into the railway power supply system through the railway power conditioner (RPC)
RPC variable-step-size adaptive neural network (Adaline) self-immune model predictive control strategy was proposed. Firstly
the operation principle of photovoltaic access to railway power supply system was analyzed
and the mathematical model of photovoltaic and RPC single-phase power supply arm were established. Secondly
the characteristics of the traditional model predictive control and ADRC in suppressing system disturbances were analyzed. In view of the difficulty of parameter setting of active disturbance rejection controller
the online parameter tuning using a variable-step-size Adaline was implemented to suppress system disturbance
and the low frequency stability of new energy photovoltaic system was im-proved when it was integrated into railway power supply system. Finally
After testing and comparison
the proposed strategy improves the low frequency stability of the system
reduces the total harmonic distortion rate of the system current
takes into account the fast response of DC voltage and overshoot suppression
and avoids the parameter tuning of the ADRC controller.
HU H T, ZHOU Y, LI X, et al.Low-frequency oscillation in electric railway depot: a comprehensive review[J]. IEEE transactions on power electronics, 2021, 36(1): 295-314.
LIAO Y C, LIU Z G, ZHANG H, et al.Low-frequency stability analysis of single-phase system with dq-frame impedance approach: part Ⅰ: impedance modeling and verification[J]. IEEE transactions on industry applications, 2018, 54(5): 4999-5011.
LIU Z G, XIANG C, WANG Y Q, et al.A model-based predictive direct power control for traction line-side converter in high-speed railway[J]. IEEE transactions on industry applications, 2017, 53(5): 4934-4943.
LIU Z G, YAN Q X, TASIU I A, et al.A model predictive control considering parameters and system uncertainties for suppressing low-frequency oscillations of traction dual rectifiers[J]. IEEE transactions on transportation electrification, 2021, 7(3): 1031-1046.
GENG Z Z, LIU Z G, HU X X, et al.Low-frequency oscillation suppression of the vehicle-grid system in high-speed railways based on H∞ control[J]. Energies, 2018, 11(6): 1594.
ZHOU Y, HU H T, YANG X W, et al.Impacts of quadrature signal generation-based PLLs on low-frequency oscillation in an electric railway system[J]. IEEE transactions on transportation electrification, 2021, 7(4): 3124-3136.
CHENG S K, MA L, GE X L, et al.Low-frequency oscillation analysis in train-traction power supply system using an SISO voltage loop model[J]. IEEE transactions on transportation electrification, 2022, 8(1): 636-648.
ZHOU Y, ZANG T L, ZHOU B X, et al.Impacts of dynamic frequency feedback loop in SOGI-PLL on low-frequency oscillation in an electric railway system[J]. IEEE transactions on transportation electrification, 2023, 9(3): 4080-4093.