Analysis and Control of Grid-Tied Quad-PV LLC Converter with MPPT
Analysis and Control of Grid-Tied Quad-PV LLC Converter with MPPT
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带 MPPT 的并网四路 PV LLC 转换器的分析与控制
DOI：
10.1109/ecce44975.2020.9235601
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
I. Batarseh
中科院分区：
文献类型：
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作者：
Sumana Ghosh;Reza Rezaii;Abdullah Alhatlani;I. Batarseh
本文提出了一种多输入DC-DC转换器，它集成了四个光伏（PV）面板，通常其次是第二级并网逆变器。该拓扑使用单个LLC谐振回路，通过四个半桥转换器提供输出。最大功率点跟踪（MPPT）算法的所有四个光伏组件设计使用四个自由度。开关频率和三个相移可确保所有开关的精确脉宽调制（PWM），同时在所有开关上实现零电压开关（ZVS），以适应宽输入范围和负载变化。直流链路电压通过使用逆变器控制器的外部电压回路维持在300 V。为了减少注入电流中的谐波失真，开发了一种基于比例谐振（PR）控制器的锁相环（PLL）来调节单相电网的功率。最后，对一个1.2kW的四极光伏发电系统进行了仿真，并推导了该系统的增益方程。仿真结果表明，所提出的闭环控制的变换器成功地同意推导的数学模型。
This paper proposes a multi input DC-DC converter that integrates four photovoltaics (PV) panels that is typically followed by a second stage of grid-tied inverter. This topology uses single LLC resonant tank to supply the output using four half-bridge converters. Maximum power point tracking (MPPT) algorithm for all four PV module is designed using four degrees of freedom. The switching frequency and three phase shifts ensures the accurate pulse width modulation (PWM) for all switches while achieving zero-voltage switching (ZVS) across all the switches for a wide input range and load variations. The dc link voltage is maintained at 300V by using outer voltage loop of the inverter controller. To reduce the harmonic distortion in injected current, a phase locked loop (PLL) with proportional resonant (PR) based controller is developed to regulate the power with single phase grid. Finally, a 1.2kW quad-PV model has been simulated and the gain equation is derived for the proposed model. The simulation results ensure that the proposed converter with closed loop control successfully agree with the derived mathematical model.