Abstract
This paper proposes a predictive voltage control strategy for a direct matrix converter used in a renewable energy distributed generation (DG) system. A direct matrix converter with LC filters is controlled in order to work as a stable voltage supply for loads. This is especially relevant for the stand-alone operation of a renewable DG where a stable sinusoidal voltage, with desired amplitude and frequency under various load conditions, is the main control objective. The model predictive control is employed to regulate the matrix converter so that it produces stable sinusoidal voltages for different loads. With predictive control, many other control objectives, e.g., input power factor, common-mode voltage, and switching frequency, can be achieved depending on the application. To reduce the number of required measurements and sensors, this paper utilizes observers and makes the use of the switch matrices. In addition, the voltage transfer ratio can be improved with the proposed strategy. The controller is tested under various conditions including intermittent disturbance, nonlinear loads, and unbalanced loads. The proposed controller is effective, simple, and easy to implement. The simulation and experimental results verify the effectiveness of the proposed scheme and control strategy. This proposed scheme can be potentially used in microgrid applications.
Highlights
Energy generation issues are driving the development of renewable energy based distributed generation (DG) and microgrids and these have been the focus of great interest [3][4]
The main contributions of this paper include: (1) a control scheme for a matrix converter interfaced renewable energy DG system is proposed and the DG can be either islanded or grid-connected; (2) instead of controlling output currents, a predictive voltage control strategy for a direct matrix converter is proposed which supplies various loads in an islanded DG system; the output voltage control is achieved by utilizing LC filters; (3) with the proposed predictive voltage control, other control objectives and constraints can be readily considered including common-mode voltage, input power factor and average switching frequency; (4) the voltage transfer ratio (VTR) is improved with the proposed scheme and the number of required sensors is reduced by using observers; and (5) a matrix converter prototype is built to validate the proposed scheme
This paper proposes a renewable energybased DG involving a direct matrix converter
Summary
The main control objective during islanded operation is to maintain stable sinusoidal voltages for various loads [5]-[8] These operating modes depend on system operating conditions, users demand, availability of energy, and utility grid requirement. The main contributions of this paper include: (1) a control scheme for a matrix converter interfaced renewable energy DG system is proposed and the DG can be either islanded or grid-connected; (2) instead of controlling output currents, a predictive voltage control strategy for a direct matrix converter is proposed which supplies various loads in an islanded DG system; the output voltage control is achieved by utilizing LC filters; (3) with the proposed predictive voltage control, other control objectives and constraints can be readily considered including common-mode voltage, input power factor and average switching frequency; (4) the VTR is. The regulated voltage meets the voltage quality set in the IEEE standard: IEEE Std519-2014 [34]
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