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Optimized Selection and Utilization of DC-Link Capacitor in a Single-Phase PV Grid Inverter System

机译：单相光伏并网逆变器系统中直流母线电容器的优化选择与利用

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order harmonics. This paper shows in a design how to improve the utilization of metalized polypropylene film capacitor (MPFC) specifications in multiple dimensions simultaneously: breakdown voltage rating, capacitance, ripple current capability and warranted reliability performance. As a result, the system size and cost can be reduced, while the overall energy capturing efficiency is guaranteed. Under low-capacitance conditions the DC-Link voltage varies within a fundamental cycle; a boost converter is placed between the PV panel and the DC-Link to provide MPPT (maximum power point tracking). The modulation index of the output inverter can be dynamically varied for waveform compensation. Comparison is made with electrolytic capacitors and it is found that when using an optimized capacitor selection strategy, it is possible to mitigate the increased size and cost implications of film capacitors. Simulation demonstrates the design of a 2.5kW system, while experiment is conducted to prove the design concept.
机译：有序谐波。本文在设计中展示了如何在多个维度上同时提高金属化聚丙烯薄膜电容器（MPFC）规格的利用率：击穿电压额定值，电容，纹波电流能力和有保证的可靠性。结果，可以减小系统尺寸和成本，同时保证了整体的能量捕获效率。在低电容条件下，直流母线电压在一个基本周期内变化。在PV面板和DC-Link之间放置了一个升压转换器，以提供MPPT（最大功率点跟踪）。输出反相器的调制指数可以动态变化以进行波形补偿。与电解电容器进行了比较，发现使用优化的电容器选择策略时，可以减轻薄膜电容器的尺寸增加和成本影响。仿真演示了一个2.5kW系统的设计，同时进行了实验以证明设计概念。

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