Modular Multilevel Converter for Photovoltaic Application with High Energy Yield under Uneven Irradiance

The direct integration of Photovoltaic (PV) to the three-phase Modular Multilevel Converter (MMC) without dc–dc converters results in high-efficiency PV power plant with increased energy yield. The arm power control method for the MMC further improves the extraction of available power under uneven irradiance across different phases of the MMC. However, the uneven irradiance between the sub-modules results in residual voltage that results in harmonics and unbalance components. In this paper, the effect of uneven irradiance across the sub-module of the MMC is investigated with arm power control method. A modified balancing algorithm for the arm power control of the MMC is proposed which enables balanced power to be injected into ac grid despite uneven irradiance across the sub-modules in the MMC. The modified balancing algorithm enables to keep the unbalance in the phase currents below 10% and the Total Harmonic Distortion (THD) is confined as per IEEE 519 standard.

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Input Current Balancing Control Method under Imbalanced Load for Three-phase Multi-port Converter based on Modular Multilevel Converter

2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia) ◽

10.1109/ipemc-ecceasia48364.2020.9368061 ◽

2020 ◽

Author(s):

Takumi Yasuda ◽

Mitsuru Miyashita ◽

Takahiro Kumagai ◽

Keisuke Kusaka ◽

Jun-ichi Itoh ◽

...

Keyword(s):

Control Method ◽

Input Current ◽

Modular Multilevel Converter ◽

Multilevel Converter ◽

Three Phase ◽

Balancing Control

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A Concept of Virtual-Flux Direct Power Control of Three-Phase AC-DC Converter

International Journal of Power Electronics and Drive Systems (IJPEDS) ◽

10.11591/ijpeds.v8.i4.pp1776-1784 ◽

2017 ◽

Vol 8 (4) ◽

pp. 1776

Author(s):

Nor Azizah Mohd Yusoff ◽

Azziddin M. Razali ◽

Kasrul Abdul Karim ◽

Tole Sutikno ◽

Auzani Jidin

Keyword(s):

Power Control ◽

Control Method ◽

Harmonic Distortion ◽

Input Voltage ◽

Control Technique ◽

Direct Power ◽

Direct Power Control ◽

Pulse Width Modulated ◽

Three Phase ◽

Virtual Flux

<p>This paper presents a proposed technique of virtual-flux direct power control (VF-DPC) as the improvement in control method from the basic of conventional direct power control (DPC) for front-end three-phase pulse width modulated (PWM) in ac-dc converter. Three sensors in order to measure the three phase input voltage have been eliminated in the proposed method of virtual flux (VF) regarding from the estimation technique. Theoritical principles of VF-DPC are discussed in this paper. The steady-state performance of VF-DPC and conventional DPC are evaluated and presented in this work to estinguish for the excellent performance. It is shown that the VF-DPC exhibits the several advantages, particularly in providing low total harmonic distortion with almost sinusoudal of input current and unity power factor (pf) operation under balanced three phase voltage supply. The simulation results from both methods through Matlab simulation have demonstrated the outstanding performance of the new proposed control technique from VF-DPC.</p>

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