双向隔离型AC-DC矩阵变换器最小开关损耗控制方法

doi:10.19595/j.cnki.1000-6753.tces.250350

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Abstract Bidirectional isolated matrix converter (BIMC) is acknowledged to possess significant application potential in energy storage systems and electric vehicles, owing to its inherent advantages of bidirectional power flow capability and high power density. Traditional BIMC control methods have high switching losses and efficiency limitations. This paper proposed a novel minimum-switching-loss control strategy. The optimal combination of phase-shift angles was selected within the modulation strategy to minimize power-electronic device losses, thereby enhancing the overall converter efficiency across the power operating range.
The dual-line-voltage modulation strategy and three established modulation techniques were compared. The number of independently adjustable phase-shift angles was increased, facilitating the implementation of a triple-phase-shift modulation strategy. This enhancement enabled precise, flexible control of power transfer direction and the operating states of the switching devices. In modeling the switching losses of BIMC power electronic devices, the superposition theorem was used to decompose the voltage and current waveforms, and the initial inductor current was determined. This derived initial value was then used to compute the instantaneous switching losses occurring at each switching transition. Consequently, a comprehensive mathematical model characterizing the total switching loss over a fundamental power-frequency cycle was formulated. The functional relationship between cumulative switching loss and the applied phase-shift angles was established under the dual-line-voltage modulation framework. The sequential quadratic programming (SQP) algorithm solves the nonlinear constrained optimization problem. Input power specifications and permissible ranges for phase shift angles were defined as the primary constraints. The optimal combination of phase-shift angles was dynamically computed in real time. This optimal set was then applied to generate pulse-width modulation (PWM) control signals. Furthermore, during the experimental phase, calorimetric techniques were employed to obtain highly accurate measurements of transformer core and copper losses. This methodology provided a reliable foundation for precisely isolating power electronic device switching losses from the aggregate system power dissipation.
The proposed control strategy was evaluated through Matlab/Simulink simulations and experimental validation on a 1.5 kW BIMC prototype platform. Key performance metrics, including grid-side current quality, input power factor, DC-link stability, and system efficiency, were assessed. Simulation results demonstrate that the proposed method generates a near-sinusoidal grid-side current with a total harmonic distortion (THD) below 3.38%, achieving a unity power factor operation and ensuring stable DC-link voltage and current. Experimental results demonstrate that the grid current THD consistently measures less than 3.38%. The overall converter efficiency remains above 94% across a wide load range, reaching a peak of 96.89%.

Key words： AC-DC matrix converter dual-line voltage modulation strategy switching loss sequential quadratic programming

Received: 05 March 2025

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TM46

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	Mei Yang
	Shi Yi
	Zhang Jiaqi

Cite this article:

Mei Yang,Shi Yi,Zhang Jiaqi. Minimum Switching Loss Control Method for Bidirectional Isolated AC-DC Matrix Converters[J]. Transactions of China Electrotechnical Society, 2026, 41(4): 1414-1424.

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