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首页> 外文期刊>Renewable Power Generation, IET >Improved phase-locked loop-based control for grid-integrated PV system
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Improved phase-locked loop-based control for grid-integrated PV system

机译：改进的基于锁相环的网格集成光伏系统控制

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摘要

This work presents an improved phase-locked loop (IPLL)-based control for grid-integrated photovoltaic (PV) system (GIPVS). It is used to extract amplitude, frequency, and phase angle of distorted load currents to control PV-grid-interfaced voltage source converter (VSC). The VSC controls active and reactive powers at unbalances and distortions in the grid voltages. The control algorithm of VSC includes power feed-forward term, DC-link voltage, and grid voltages. The feed-forward term improves the dynamic performance of a GIPVS and enhances the utilisation of VSC. Three-phase IPLLs extract the in-phase components of three-phase load currents at utility frequency. Further, these in-phase components of load currents are used for estimation of reference-grid currents. The proposed IPLL-based control algorithm offers good dynamic response even under unbalanced load condition. The efficient working of IPLL-based control algorithm is realised by extracting maximum power from PV-grid system and through its power-quality improvement. The perturb and observe (P & O) control algorithm is used for optimum utilisation of a PV array. A developed prototype of PV-grid system is used to implement an IPLL-based control algorithm under different operating conditions.
机译：该工作提出了一种改进的锁相环（IPLL）对网格集成光伏（PV）系统（GIPV）的基础控制。它用于提取失真负载电流的幅度，频率和相位角，以控制PV-栅极接口电压源转换器（VSC）。 VSC在不平衡和电压电压中的失值下控制有源和无功功率。 VSC的控制算法包括电力前馈期，直流链路电压和电网电压。前馈期限提高了GIPV的动态性能，并增强了VSC的利用率。三相IPLLS在实用频率下提取三相负载电流的相位分量。此外，负载电流的这些同相分量用于估计参考网格电流。即使在不平衡负载条件下，所提出的基于IPLL的控制算法也具有良好的动态响应。基于IPLL的控制算法的有效工作是通过从PV-Grid系统提取的最大功率和通过其电力质量改进来实现的。扰动和观察（P＆O）控制算法用于PV阵列的最佳利用。 PV-Grid系统的开发原型用于在不同的操作条件下实现基于IPLL的控制算法。

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