A novel three-phase four-leg inverter based load unbalance compensator for stand-alone microgrid

Kim, Gyeong-Hun; Hwang, Chul-Sang; Jeon, Jin-Hong; Ahn, Jong-Bo; Kim, Eung-Sang

doi:10.1016/j.ijepes.2014.09.035

Cited by 34 publications

(27 citation statements)

References 18 publications

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“…where U an , U bn , and U cn are the load voltages; U Af , U Bf , and U Cf are the inverter voltages; and i La , i Lb , and i Lc are the inductors currents. On the other hand, by using the Kirchhoff's current law (KCL) in the load neutral point n, the existing relation between the currents can be expressed as (2).…”

Section: Model Descriptionmentioning

confidence: 99%

A new digital control of four‐leg inverters in the natural reference frame for renewable energy–based distributed generation

Pichan

Rastegar

Monfared

2019

Int Trans Electr Energ Syst

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Summary Nowadays, stand‐alone dispersed generation (DG) supplied from renewable energies is rapidly growing. In such a condition, four‐leg inverter can be considered as a successful option to supply unbalanced loads, especially in transformerless systems. In this paper, four‐leg inverter is modeled considering the fourth line inductor. The neutral (fourth) line inductor causes a high coupling through control variables in the natural reference frame. To avoid several transformations among reference frames, a new digital controller based on deadbeat (DB) theory is proposed in the natural reference frame to regulate the load voltages under coupled model. The proposed method offers simplicity, ease of digital implementation, and a fast dynamic response. Furthermore, a delay compensation procedure is also proposed to make the overall performance of the proposed DB controller better. Experimental tests based on a 3kW prototype are implemented to support the analytical analysis. Different tests under various single/three‐phase, nonlinear/linear, and unbalanced/balanced load conditions were performed, which confirm the excellent performance of the proposed control system.

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Section: Model Descriptionmentioning

confidence: 99%

A new digital control of four‐leg inverters in the natural reference frame for renewable energy–based distributed generation

Pichan

Rastegar

Monfared

2019

Int Trans Electr Energ Syst

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“…The current. The each and _ can be nate _ , _ ry, the unbalance tem has AC values - (3). Hence, the e calculated using ted as a first-order the LPF is 10 Hz.…”

Section: Current Control Algorithmmentioning

confidence: 99%

“…Especially, the unbalance current is caused by unbalance loads in the small scale grid such as microgrid installed in remote country side and islands [2], [3]. The power system installed in a remote country may be small scale, and has a low voltage distribution network, in which they have a higher likelihood of significant load unbalance between phases.…”

Section: Introductionmentioning

confidence: 99%

Three-phase four-leg type PCS with individual phase control algorithm for compensating unbalance loads using ESS

Kim

Park

et al. 2015

2015 IEEE 11th International Conference on Power Electronics and Drive Systems

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The power systems have encountered with a problem such as unbalance current due to loads unbalance. Particularly, the problem rises in the small scale grid such as a microgrid that is installed in remote country and island which are difficult to reach existing power grid. To solve the unbalance current of the grid, we usually use compensators for balancing the current of the grid. In this paper, the authors propose a power conditioning system (PCS) using energy storage system which has not only normal operation functions but also a compensation function of the unbalance current of the grid without special compensators. The proposed PCS is modeled and simulated using PSCAD/EMTDC to demonstrate the effectiveness of the system.

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“…Several solutions have been proposed in the literature to compensate imbalance and harmonic distortion [15] [16] [17]. Among them Active Power Filters (APFs) are considered appropriate topologies with several papers discussing issues such as the design of APF's passive components [6] [12], compensation objectives [8] [18], serial and/or parallel connection of APFs [6], etc. The performance of the APF is heavily dependent on the control system applied which is usually based on a power theory, with many applications using the p-q or modified p-q power theories.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of a CPT-Based Four-Leg Active Power Compensator for Distributed Generation

Burgos-Mellado

Hernandez-Cariman

Cárdenas

et al. 2017

IEEE J. Emerg. Sel. Topics Power Electron.

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Abstract -Four-wire microgrids and distribution systems are inherently unbalanced with the presence of negative and zero sequence components in voltages and currents. In small autonomous systems the imbalance, in addition to the harmonic distortion produced by non-linear loads, can significantly affect power quality, loadability and stability of the system. Furthermore, in isolated networks with significant generation from intermittent renewable energy sources, the stiffness of the system is reduced and this could amplify the effects of imbalance on the stability and power quality. To mitigate some of these problems, a novel methodology based on the application of a 4-leg Active Power Filter (APF) is proposed in this paper. The control of the compensator is based on the Conservative Power Theory (CPT) augmented by Resonant Controllers. The behaviour of the proposed system is demonstrated using an experimental prototype deployed in a laboratory scale microgrid Index Terms-Active power filter, conservative power theory, resonant control, microgrids, imbalance, harmonic distortion.

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A novel three-phase four-leg inverter based load unbalance compensator for stand-alone microgrid

Cited by 34 publications

References 18 publications

A new digital control of four‐leg inverters in the natural reference frame for renewable energy–based distributed generation

A new digital control of four‐leg inverters in the natural reference frame for renewable energy–based distributed generation

Three-phase four-leg type PCS with individual phase control algorithm for compensating unbalance loads using ESS

Experimental Evaluation of a CPT-Based Four-Leg Active Power Compensator for Distributed Generation

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