Constant frequency-unified power quality conditioner for wind turbine generator connected with micro grid

According to the power quality problems of micro-grid, this paper presents a control program of the Unified Power Quality Conditioner (UPQC) to improve the micro-grid power quality.The shunt side of UPQC is used to eliminate the harmonic current brought by nonlinear load into the micro-grid. And the conditioner series part is used to suppress distributed new energy generation intermittence. In the paper synchronous coordinate transformation is used to detect compensated components and tracking control method is adopted to control the converter. The simulation results demonstrate the effectiveness of the UPQC on improving the power quality of the micro-grid.

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A Wavelet-Based Unified Power Quality Conditioner to Eliminate Wind Turbine Non-Ideality Consequences on Grid-Connected Photovoltaic Systems

Energies ◽

10.3390/en9060390 ◽

2016 ◽

Vol 9 (6) ◽

pp. 390 ◽

Cited By ~ 1

Author(s):

Bijan Rahmani ◽

Weixing Li ◽

Guihua Liu

Keyword(s):

Wind Turbine ◽

Power Quality ◽

Photovoltaic Systems ◽

Unified Power Quality Conditioner ◽

Power Quality Conditioner

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An application phase-modular rectifier applied to MMC with medium voltage based on wind turbine generator

International Journal of Engineering & Technology ◽

10.14419/ijet.v3i3.2996 ◽

2014 ◽

Vol 3 (3) ◽

pp. 378

Author(s):

Narin Watanakul

Keyword(s):

Power Control ◽

Wind Turbine ◽

Power Quality ◽

Power Factor ◽

Reactive Power ◽

Current Phase ◽

Unity Power Factor ◽

Turbine Generator ◽

Medium Voltage ◽

Wind Turbine Generator

This paper proposes two stages of controller. First stage, direct power control (P-Q control) applied single-phase structure of multilevel modular converter (MMC) , multilevel cascaded H-Bridge inverter with 9-level SPWM injection to medium voltage (24kV) based on wind turbine generator (PMSG)rated capacity 25kVA. Second stage, three-phase PFC rectifier with phase-modular Y-rectifier, boosttype. The separate dc sources (DC-links) average voltage at 178V (Vdc1-Vdc12). This study is concerned with the application, operating, principle, and design example. The unity power factor operation of PMSG is realized by controlling of phase-modular Y-Rectifier system, and the current waveform distortion results increase of the lower harmonics distortion. The P-Q controller can make it possible of the grid line current phase by providing the direct instantaneous power control in the steady state under the active power and reactive power command. The data collected by PSIM and MATLAB simulation are used in comparison with the experimental tester of results. This provides guideline to further analyze and improvement energy efficiency and power quality in electrical system pertinent to wind turbine generator (PMSG). Keywords: Wind Turbine Generator, Permanent Magnet Synchronous Generator (PMSG), Phase-Modular Y-Rectifier, Cascaded H-Bridges, Modular Multilevel Converter (MMC), Power Quality, Unity Power Factor, Harmonics.

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The Voltage Control Strategy of a DC-Link Bus Integrated Photovoltaic Charging Module in a Unified Power Quality Conditioner

Energies ◽

10.3390/en12101842 ◽

2019 ◽

Vol 12 (10) ◽

pp. 1842 ◽

Cited By ~ 1

Author(s):

Fuyin Ni ◽

Zhengming Li ◽

Qi Wang

Keyword(s):

Power Quality ◽

Control Strategy ◽

Voltage Control ◽

Pi Controller ◽

Voltage Control Strategy ◽

Unified Power Quality Conditioner ◽

Novel Approach ◽

Micro Grid ◽

Bus Voltage ◽

Power Quality Conditioner

In order to improve the functionality and efficiency of a unified power quality conditioner (UPQC), a DC-link bus integrated photovoltaic charging module is proposed in a UPQC. It can generate power for essential loads apart from providing energy to a DC-link bus. A conventional proportional integral (PI) controller fails to run smoothly in dynamic conditions of the micro-grid, since it has poor capabilities in determining suitable values of proportional gain and integral gain. So, the optimization algorithm for a PI controller based on chaos particle swarm optimization based on a multi-agent system (CPSO-MAS) algorithm was developed in this paper to overcome properties such as intermittent instability in the micro-grid. Through verification by simulation and experiment of UPQC harmonic compensation, it showed that the proposed DC link bus voltage control strategy can be effectively applied to UPQC towards various conditions related to voltage and current distortion. In addition, it proved that the proposed strategy has faster convergence than other algorithms, which enhances the stability of DC-link bus voltage. Hence, the contribution presented in this paper is to provide a novel approach for the power quality improvement of UPQC.

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