A novel active power decoupling method for single-phase photovoltaic or energy storage applications
A novel active power decoupling method for single-phase photovoltaic or energy storage applications
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DOI：
10.1109/ecce.2012.6342406
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发表时间：
2012-11
期刊：
影响因子：
--
通讯作者：
Shengfang Fan;Yaosuo Xue;Kai Zhang
中科院分区：
文献类型：
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作者：
Shengfang Fan;Yaosuo Xue;Kai Zhang
传统的单相逆变器表现出双线频率功率脉动，这会影响光伏性能和电池寿命等直流电源。大容量直流母线电解电容器通常用作瞬态能量缓冲器，以将脉动交流电源与恒定直流电源解耦，但此类无源元件存在温度和老化问题。为了获得高可靠性和高功率密度，优选有源功率解耦方法。本文提出了一种使用六开关单相逆变器拓扑的新型有源功率解耦方法。交流侧采用小型薄膜电容器作为脉动能量缓冲，不仅提高了可靠性，而且提高了效率。还提出了一种针对该拓扑的新型矢量 PWM，以最大限度地提高直流电压利用率，并实现逆变器输出功率和功率解耦的独立控制。仿真结果验证了所提出的功率解耦方法。
Conventional single-phase inverters exhibit double line frequency power pulsating, which affects dc sources such as photovoltaic performance and battery lifetime. Bulky dc-link electrolytic capacitors are typically employed as transient energy buffer to decouple the pulsating ac power from constant dc power, but such passive components suffer from temperature and aging concerns. For high reliability and high power density, active power decoupling approach is preferred. This paper presents a novel active power decoupling method by using a six-switch single-phase inverter topology. A small film capacitor is used as pulsating energy buffer in ac side, which not only improves the reliability but also the efficiency. A novel vector PWM for this topology is also proposed to maximize the dc voltage utilization, and to achieve the independent controls of the inverter output power and power decoupling. The simulation results have verified the proposed power decoupling method.