基于模型预测与复合占空比的双有源全桥变换器电压电流暂稳态调控方法

doi:10.19595/j.cnki.1000-6753.tces.240257

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Abstract Because of excellent performance in electrical isolation, bidirectional energy flow, and soft switching, dual active bridge (DAB) converters are widely used in new energy grid connections, electric vehicles, and train traction. In the new power system, the types of source loads are diverse, and the DC bus voltage varies greatly, resulting in a mismatch between the input and output voltages of the DAB converter, high current stress, hard switching, and low system efficiency. Meanwhile, the high proportion of new energy makes the operating conditions of the new power system very complex, and various source load devices are frequently changed. Therefore, the DAB converter should have good steady-state and transient performance.
Existing modulation and control methods are challenging in achieving suppression of inductor current and output voltage ripple and improving system dynamic performance over the full power and wide voltage conversion ratio range. This paper proposes a control method for DAB converters based on model predictive control (MPC) and composite duty modulation (CDM). Firstly, a state-space average model considering various harmonics is established to optimize system steady-state performance. Then, a state-space average model of output voltage is established to reduce the number of sensors in the closed-loop control. Secondly, a CDM method is proposed to optimize the steady-state performance of DAB converters. Then, the forward Euler method calculates differential terms, and the output voltage is predicted to construct a transient- and steady-state control strategy based on MPC and CDM. Finally, experiments are conducted to verify the proposed control strategy.
The conclusions can be drawn as follows. (1) The state-space average model of DAB converters considering various harmonics can calculate inductor current and output voltage ripple, and high-frequency current information sampling can be avoided by eliminating the inductor current in the state-space equation. (2) The proposed control method can solve the problems of fundamental duty modulation and multi-order reactive-current suppression strategies. Compared with the single-phase-shift modulation strategy, the proposed regulation method can suppress inductor current and output voltage ripple over the full operating range, reducing the inductor rms current by 61.9% and output voltage ripple by 70.5%. (3) The proposed control method significantly improves the dynamic performance, achieving fast switching of the DAB converter operating state without overshooting. When the transmission power is changed abruptly, the proposed control method transits to the target state within 3 ms smoothly.

Key words： Solid-state transformers dual active bridge converters steady-state performance dynamic performance triple-phase-shift modulation

Received: 17 February 2024

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TM46

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	Yang Ming
	Wang Xiaofeng
	Sima Wenxia
	Tang Junhao

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Yang Ming,Wang Xiaofeng,Sima Wenxia等. Transient- and Steady-State Optimization of Voltage and Current for Dual Active Bridge Converters Based on Model Predictive Control and Composite Duty Modulation[J]. Transactions of China Electrotechnical Society, 2025, 40(4): 1203-1220.

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