A multimodule parallelable series-connected PWM voltage regulator

Chiang, S.J.; Yen, Chih-Ying; Chang, Kuo-Tsai

doi:10.1109/41.925577

Cited by 139 publications

(72 citation statements)

References 13 publications

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“…3. Resistive output impedance can be a good solution to share linear and nonlinear loads in applications such as uninterruptible-power-supply systems [23]. However, when the distance between the inverters is considerable, an inductive impedance component appears which impoverishes active and reactive power sharing.…”

Section: Output-impedance Impact Over Power Sharingmentioning

confidence: 99%

“…To solve this, interface inductors can be included between the inverter and the load bus, but they are heavy and bulky [22]. As an alternative, novel control loops that fix the output impedance of the units by emulating lossless resistors or reactors have been proposed [23], [24]. However, although the output impedance of the inverter can be well established, the line impedance is unknown, which can result in an unbalance of reactive power flow [18].…”

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confidence: 99%

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Wireless-Control Strategy for Parallel Operation of Distributed-Generation Inverters

Guerrero

Matas

Vicuña

et al. 2006

IEEE Trans. Ind. Electron.

589

113

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Abstract-In this paper, a method for the parallel operation of inverters in an ac-distributed system is proposed. This paper explores the control of active and reactive power flow through the analysis of the output impedance of the inverters and its impact on the power sharing. As a result, adaptive virtual output impedance is proposed in order to achieve a proper reactive power sharing, regardless of the line-impedance unbalances. A soft-start operation is also included, avoiding the initial current peak, which results in a seamless hot-swap operation. Active power sharing is achieved by adjusting the frequency in load transient situations only, owing to which the proposed method obtains a constant steady-state frequency and amplitude. As opposed to the conventional droop method, the transient response can be modified by acting on the main control parameters. Linear and nonlinear loads can be properly shared due to the addition of a current harmonic loop in the control strategy. Experimental results are presented from a two-6-kVA parallel-connected inverter system, showing the feasibility of the proposed approach.

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Section: Output-impedance Impact Over Power Sharingmentioning

confidence: 99%

mentioning

confidence: 99%

Wireless-Control Strategy for Parallel Operation of Distributed-Generation Inverters

Guerrero

Matas

Vicuña

et al. 2006

IEEE Trans. Ind. Electron.

589

113

View full text Add to dashboard Cite

show abstract

“…In [7], an enhanced droop control featuring a transient droop performance is proposed. To improve the active and reactive power decoupling performance, improved droop controllers with virtual output impedance are reported [8]. To account for nonlinear load sharing, harmonic droop controller is reported in [9].In [10] a new control scheme for DGs using a current controlled voltage source inverter (VSI) was proposed.…”

Section: Introductionmentioning

confidence: 99%

Optimization of microgrids based on controller designing for islanded operation

Arefi

Unesi

Ruzbehi

2016

J. Fundam and Appl Sci.

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The power quality of microgrid during islanded operation is strongly related with the controller performance of DGs. Therefore a new optimal control strategy for distributed generation based inverter to connect to the generalized microgrid is proposed. This work shows developing optimal control algorithms for the DG interface that guarantee stable and high power quality injection under the occurrence of network disturbances. In this paper, two typical distributed generation (DG) units are connected in parallel to configuration the Microgrid. One of DG units has voltage-frequency (VF) controller loop and other has active-reactive (PQ) power controller loop that based on the conventional PI regulators.Through simulation in Matlab by selecting appropriate genetic algorithm is designed to tune the parameters Kp i and Ki i of the PI controllers, the performance of the system to demonstrate the effectiveness of the proposed methodology.

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“…An example of this application are the so-called grid-supporting inverters, which are designed to flexibly support the voltage and/or frequency of either a stand-alone or a interconnected grid, as shown in [6].…”

Section: A Grid Connected Modementioning

confidence: 99%

Microgrid connection management based on an intelligent connection agent

Rocabert

Azevedo

Candela

et al. 2010

IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society

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Abstract-The increasing penetration of generation power plants based on renewable energies in the electrical networks has boosted the number of systems connected to the grid. In this scenario the microgrid, providing advanced functionalities to improve the stability and operation of the network, have become very popular. In this paper a control strategy for the microgrid management is presented. The proposed system improves the performance of microgrids and its interaction with the main network, or another microgrid, under grid voltage transients. This technique gives rise to a simple and robust control scheme to ensure the appropriate microgrid disconnection, and further resynchronization and reconnection, from the main grid. In the following, the control algorithm for the intelligent connection agent will be shown, and the grid synchronization system, as well as the voltage and current control loops will be detailed. Finally, results obtained using the MATLAB/Simulink & PSIM platform will be presented and discussed.

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A multimodule parallelable series-connected PWM voltage regulator

Cited by 139 publications

References 13 publications

Wireless-Control Strategy for Parallel Operation of Distributed-Generation Inverters

Wireless-Control Strategy for Parallel Operation of Distributed-Generation Inverters

Optimization of microgrids based on controller designing for islanded operation

Microgrid connection management based on an intelligent connection agent

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