Control of three phase power supplies for ultra low THD

Doncker, Rik W. De; Lyons, J.P.

doi:10.1109/apec.1991.146242

Cited by 33 publications

(11 citation statements)

References 11 publications

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“…Second, the restoration speed required to reach steady state is assumed to be slower than the speed of droop control to reach steady state. Equation (10), which can be derived from (4) and (8), implies that the difference between V dot and nominal V dot will decay to zero.…”

Section: Proposed Q-v Dot Droop Control Methodsmentioning

confidence: 99%

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A new droop control method for the autonomous operation of distributed energy resource interface converters

Lee

Chu

Cheng

2010

2010 IEEE Energy Conversion Congress and Exposition

134

176

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Microgrid is widely accepted as an effective mean of integrating various distributed energy resources (DERs) through their interface converters to provide electric power of high quality and reliability. These distributed resources interface converters (DICs) are required to operate in an autonomous fashion without any communication for enhanced reliability. Conventionally, the real power-frequency droop control and the reactive power-voltage droop are adopted as the de-centralized control strategies in these DICs for the autonomous power sharing operations. However, the reactive power sharing of Q-V droop control often deteriorates if there are mismatched transmission line impedance characteristics. In this paper, a Q-V dot droop control method with V dot restoration mechanism is proposed to improve the sharing of reactive power. Its operation principle and control method are explained and analyzed. In addition, simulation and experimental results are presented to validate the effectiveness of the proposed method.

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Section: Proposed Q-v Dot Droop Control Methodsmentioning

confidence: 99%

“…Its output is transformed into the stationary reference frame, and then a typical close-loop predictive current controller and the space vector PWM are used to generate the gating signals of the IGBTs in the DIC converter [8]. Besides, these two DIC controllers are both integrated with conventional P-f droop control.…”

Section: Voltage and Current Controllermentioning

confidence: 99%

A new droop control method for the autonomous operation of distributed energy resource interface converters

Lee

Chu

Cheng

2010

2010 IEEE Energy Conversion Congress and Exposition

134

176

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“…The other way is fixing the harmonic compensation equipment to compensate harmonic, which is applicable to all harmonic sources [4].…”

Section: Methods Of Harmonic Suppressionmentioning

confidence: 99%

Harmonic Suppression of Grid-Connected Distributed Generation Using Multi-Objective Genetic Algorithm

Chen

Sun

2009

2009 Asia-Pacific Power and Energy Engineering Conference

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Genetic algorithm (GA) is an important method of multi-objective optimization. The method is introduced that using GA optimizes PPF parameters in this thesis. Distributed generation (DG) is a hot spot nowadays, but the harmonic pollution isn't ignored when DG is connected with the power grid through power convertors. First discuss several harmonic suppression methods have been adopted in practice, such as increasing the pulse number of convertor, using pulse width modulation (PWM) convertor, passive power filter (PPF) equipment, active power filter (APF) equipment and so on, among these Hybrid type combining PPF and APF is the most economical and effective method, so Hybrid type equipment is applied to suppress harmonics that are brought by gridconnected DG. From three respects of the cost, the DG penetration power and the total harmonic distortion (THD), using GA optimizes the PPF parameters, namely R, L, C, optimization results make the PPF cost is the most economical, the DG penetration power is the largest and the THD is the smallest, simulation shows this method is effective.

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“…The topology is commonly a "full-bridge" VSI with LC filters suitable for producing sinusoidal output voltages [2], [4]. Previous analyses of the four-leg topology have utilized the well-known 3 3 " -" transformation [7] matrix in modeling the operation of the four-leg inverter [8], [10], [11], [14].…”

mentioning

confidence: 99%

“…3 fill out a rough "sphere" in -space; this is analogous to the "circle" formed by the six nonzero voltage-vectors of the three-leg inverter in the -plane [1]. The inverse of is found as (4) As the four-leg inverter produces only three independent output voltages, subsets of the Quad-Transform are formed as (5) Fig. 4.…”

mentioning

confidence: 99%

Decoupled control of a four-leg inverter via a new 4/spl times/4 transformation matrix

Ryan¹,

Doncker²,

Lorenz

2001

IEEE Trans. Power Electron.

Self Cite

104

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Abstract-Four-Leg (3-phase 4-wire) inverters are developed to power unbalanced/nonlinear three-phase loads. A unique 4 4 decoupling transformation matrix is used that enables direct transformation between the four degree-of-freedom (DOF) leg-modulation space of the inverter and its corresponding 3-DOF outputvoltage space. This is analogous to the well-known 3 3 " -" transformation developed for the three-leg inverter. Details of this new 4 4 "Quad" transform are provided, along with a depiction of the voltage-vectors produced. Advanced synchronousframe control techniques are applied with this 4-to-3 " -" transform to create a UPS-style inverter with sinewave output. Experimental results for an 8.6 kVA prototype inverter are presented.

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Control of three phase power supplies for ultra low THD

Cited by 33 publications

References 11 publications

A new droop control method for the autonomous operation of distributed energy resource interface converters

A new droop control method for the autonomous operation of distributed energy resource interface converters

Harmonic Suppression of Grid-Connected Distributed Generation Using Multi-Objective Genetic Algorithm

Decoupled control of a four-leg inverter via a new 4/spl times/4 transformation matrix

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