Hybrid Control Method for Dc-Dc Stage of Single-phase Photovoltaic System with Dc-link Voltage Regulation and MPPT

2021 ◽  
Author(s):  
Junyan Liu ◽  
Xiaohui Li ◽  
Liang Zhang ◽  
Yibo Hao ◽  
Hengshan Xu
Keyword(s):  
Single Phase ◽  
Control Method ◽  
Hybrid Control ◽  
Voltage Regulation ◽  
Photovoltaic System

scholarly journals Design Methodology of Tightly Regulated Dual-Output LLC Resonant Converter Using PFM-APWM Hybrid Control Method

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2146
Author(s):  
HwaPyeong Park ◽  
Mina Kim ◽  
HakSun Kim ◽  
JeeHoon Jung
Keyword(s):  
Design Methodology ◽  
Control Method ◽  
Hybrid Control ◽  
Pulse Frequency ◽  
Voltage Regulation ◽  
Resonant Converter ◽  
Pulse Frequency Modulation ◽  
Load Range ◽  
Worst Case ◽  
Llc Resonant Converter

A dual-output LLC resonant converter using pulse frequency modulation (PFM) and asymmetrical pulse width modulation (APWM) can achieve tight output voltage regulation, high power density, and high cost-effectiveness. However, an improper resonant tank design cannot achieve tight cross regulation of the dual-output channels at the worst-case load conditions. In addition, proper magnetizing inductance is required to achieve zero voltage switching (ZVS) of the power MOSFETs in the LLC resonant converter. In this paper, voltage gain of modulation methods and steady state operations are analyzed to implement the hybrid control method. In addition, the operation of the hybrid control algorithm is analyzed to achieve tight cross regulation performance. From this analysis, the design methodology of the resonant tank and the magnetizing inductance are proposed to compensate the output error of both outputs and to achieve ZVS over the entire load range. The cross regulation performance is verified with simulation and experimental results using a 190 W prototype converter.

scholarly journals Hybrid Control Strategy of MPC and DBC to Achieve a Fixed Frequency and Superior Robustness

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1176 ◽  
Author(s):  
Yuhan Zhang ◽  
Guiping Du ◽  
Jiajian Li ◽  
Yanxiong Lei
Keyword(s):  
Control Strategy ◽  
Single Phase ◽  
Control Method ◽  
Hybrid Control ◽  
Voltage Source ◽  
Switching Frequency ◽  
Transient Time ◽  
Finite Control ◽  
Control Set ◽  
Comparative Results

In this paper, a hybrid control strategy for power converters, based on improved deadbeat control (DBC) and improved finite control set model predictive control (MPC), is proposed. The presented control strategy employs a switched method to achieve a fixed switching frequency while maintaining a fast transient time. Moreover, the proposal incorporates error correction to achieve superior robustness. A prototype of a single-phase voltage source rectifier is established to verify the performance of the proposal. The comparative results with conventional MPC are given and illustrate the merits of the proposed control method.

scholarly journals Low-Voltage Ride-Through Capability of a Single-Stage Single-Phase Photovoltaic System Connected to the Low-Voltage Grid

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Yongheng Yang ◽  
Frede Blaabjerg
Keyword(s):  
Distribution System ◽  
Single Phase ◽  
Control Method ◽  
Low Voltage ◽  
Photovoltaic System ◽  
Pv System ◽  
Pv Systems ◽  
Low Voltage Ride Through ◽  
Three Phase ◽  
Future Challenges

The progressive growing of single-phase photovoltaic (PV) systems makes the Distribution System Operators (DSOs) update or revise the existing grid codes in order to guarantee the availability, quality, and reliability of the electrical system. It is expected that the future PV systems connected to the low-voltage grid will be more active with functionalities of low-voltage ride-through (LVRT) and the grid support capability, which is not the case today. In this paper, the operation principle is demonstrated for a single-phase grid-connected PV system in a low-voltage ride-through operation in order to map future challenges. The system is verified by simulations and experiments. Test results show that the proposed power control method is effective and the single-phase PV inverters connected to low-voltage networks are ready to provide grid support and ride-through voltage fault capability with a satisfactory performance based on the grid requirements for three-phase renewable energy systems.

Improving the Efficiency of a Photovoltaic System Using a Hybrid Control Method Based on a DPP Structure

2020 ◽  
Vol 16 (1) ◽  
pp. 625-632
Author(s):  
Dong-Eun Kim ◽  
Hyun-Jae Lee ◽  
Hak-Ryong Moon ◽  
Jin-Geun Shon
Keyword(s):  
Control Method ◽  
Hybrid Control ◽  
Photovoltaic System

scholarly journals Experimental Implementation of a Low-Cost Single Phase Five-Level Inverter for Autonomous PV System Applications Without Batteries

2018 ◽  
Vol 8 (1) ◽  
pp. 2452-2458 ◽  
Author(s):  
A. Nouaiti ◽  
A. Saad ◽  
A. Mesbahi ◽  
M. Khafallah
Keyword(s):  
Single Phase ◽  
Control Method ◽  
Low Cost ◽  
Multilevel Inverter ◽  
Photovoltaic System ◽  
Solar Panels ◽  
Pv System ◽  
Point Tracking ◽  
Switched Capacitor Converter ◽  
Storage Batteries

This paper presents the design and the implementation of a low-cost single phase five-level inverter for photovoltaic applications. The proposed multilevel inverter is composed of a simple boost converter, a switched-capacitor converter, and an H-bridge converter. An efficient control method which associates a closed-loop regulation method with a simple maximum power point tracking (MPPT) method is applied in order to allow the proposed multilevel inverter to transfer power energy from solar panels to autonomous load with no storage batteries. An experimental prototype of this inverter is fabricated at the laboratory and tested with a digital control system. Obtained results confirm the simplicity and the performance of the proposed photovoltaic system.

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