A Multiple Loops-Based Control Strategy of Current Source Rectifier for Low-Voltage DC Distribution Systems

The control of three-phase current source rectifiers presents intricate challenges due to the input LC filters and DC bus capacitors. To address these challenges, this paper proposes a multiple loops-based control strategy of current source PWM rectifiers for low-voltage DC distribution systems. Firstly, based on the adjustment of the d-axis and q-axis currents in the grid side, the independent control of the active and the reactive power is achieved. Subsequently, a compensation scheme of capacitance current based on phasor method is proposed. Next, as an alternative damping method, the capacitor-voltage feedback is used to suppress the LC resonance, and the influence of the feedback gains on the stability of the system is discussed. Furthermore, the system s dynamic performance is further improved by adopting dc-side inductor-current feedback and damping factor. Ultimately, the feasibility and efficacy of the proposed approach are confirmed through experiments.