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An improved constant on/off time control scheme for photovoltaic DC/DC MIC

机译:光伏DC / DC MIC的改进的恒定开/关时间控制方案

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In the medium and large PV power generation systems, a popular commercialized module integrated converter (MIC), comprised of H-bridge Buck-Boost topology with a pass through switch, would increase the MPPT efficiency when irradiation mismatch occurs. This paper proposes a novel control structure that, in Boost-mode, it works with constant on time control, in Buck-mode, and it works with constant off time control. The scheme can achieve ultra-fast transient response to track the fast-changing input voltage reference from MPPT block. In constant on time control, an improved ramp compensation which is from input capacitor current would increase the efficiency compared with the popular inductor current ramp compensation. A digital and analog mixed technology would be taken in this paper to realize a low cost and high performance structure. The simulation and experiment have been taken to verify the good performance of this control scheme.
机译:在中型和大型PV发电系统中,当发生辐照不匹配时,由H桥Buck-Boost拓扑和直通开关组成的流行的商用模块集成转换器(MIC)会提高MPPT效率。本文提出了一种新颖的控制结构,在Boost模式下,它可以在恒定的导通时间控制下工作,在Buck模式下,可以在恒定的关断时间控制下工作。该方案可以实现超快速瞬态响应,以跟踪来自MPPT模块的快速变化的输入参考电压。在恒定导通时间控制中,与常用的电感器电流斜坡补偿相比,来自输入电容器电流的改进的斜坡补偿将提高效率。本文将采用数字和模拟混合技术来实现低成本和高性能的结构。通过仿真和实验验证了该控制方案的良好性能。

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