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首页> 外文期刊>Advances in Electrical and Computer Engineering >Improvements on the Incremental Conductance MPPT Method Applied to a PV String with Single-Phase to Three-Phase Converter for Rural Grid Applications
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Improvements on the Incremental Conductance MPPT Method Applied to a PV String with Single-Phase to Three-Phase Converter for Rural Grid Applications

机译：应用于农村电网应用的单相至三相转换器光伏串的增量电导MPPT方法的改进

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摘要

A power electronic interface that integrates a photovoltaic string with a single-phase grid to feed a three-phase induction motor, while driving a fan-type load, is presented. The interface is composed of a single-phase active rectifier and a three-phase inverter with output transformer, wherein the Photovoltaic (PV) string is straightly connected to the DC-link, avoiding the use of additional converter for maximum power point tracking, commonly seen in previous works. However, in this system configuration, disturbances at the DC-link may occur due to increments and decrements of load active power, with consequent low-frequency oscillations at the AC grid side of the active rectifier. Therefore, a modified Incremental Conductance based algorithm is proposed, with which low-frequency oscillations around the maximum power point are minimized even under disturbances at the DC-link. Moreover, the overall system energy management, composed of control algorithms, that integrates maximum power point identification , DC-link voltage regulation, motor speed controller and power quality at the input AC mains, is also proposed. Simulation results are provided to evaluate the system effectiveness under AC mains with voltage sag occurrence, load transient and steady-state conditions at different solar irradiance levels.
机译：提出了一种功率电子接口，该接口将光伏串与单相电网集成在一起，以在驱动风扇型负载的同时为三相感应电动机供电。该接口由单相有源整流器和带有输出变压器的三相逆变器组成，其中光伏（PV）串直接连接到直流母线，从而避免了使用额外的转换器来跟踪最大功率点，通常在以前的作品中看到过。但是，在此系统配置中，由于负载有功功率的增加和减少，可能会在DC链路上发生干扰，从而在有源整流器的AC电网侧产生低频振荡。因此，提出了一种基于增量电导的改进算法，利用该算法，即使在直流母线受到干扰的情况下，最大功率点附近的低频振荡也得以最小化。此外，还提出了由控制算法组成的整体系统能量管理，该算法集成了最大功率点识别，直流母线电压调节，电动机速度控制器和输入交流电源的电能质量。提供了仿真结果，以评估在不同电压，不同太阳辐照度下交流骤降，负载瞬变和稳态条件下的交流市电下的系统有效性。

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