Journal ArticleDOI
A wireless controller to enhance dynamic performance of parallel inverters in distributed generation systems
TLDR
In this paper, a novel control strategy for parallel inverters of distributed generation units in an AC distribution system is presented, based on the droop control method, using only locally measurable feedback signals.Abstract:
This paper presents a novel control strategy for parallel inverters of distributed generation units in an AC distribution system. The proposed control technique, based on the droop control method, uses only locally measurable feedback signals. This method is usually applied to achieve good active and reactive power sharing when communication between the inverters is difficult due to its physical location. However, the conventional voltage and frequency droop methods of achieving load sharing have a slow and oscillating transient response. Moreover, there is no possibility to modify the transient response without the loss of power sharing precision or output-voltage and frequency accuracy. In this work, a great improvement in transient response is achieved by introducing power derivative-integral terms into a conventional droop scheme. Hence, better controllability of the system is obtained and, consequently, correct transient performance can be achieved. In addition, an instantaneous current control loop is also included in the novel controller to ensure correct sharing of harmonic components when supplying nonlinear loads. Simulation and experimental results are presented to prove the validity of this approach, which shows excellent performance as opposed to the conventional one.read more
Citations
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Proceedings ArticleDOI
A controller for the smooth transition from grid-connected to autonomous operation mode
TL;DR: In this paper, a local controller for inverter of DERs is presented to manage a microgrid during grid-connected and autonomous operation modes and also during the transition, which is based on the P-f and Q-V droop control.
Journal ArticleDOI
Designing robust controller to improve current-sharing for parallel-connected inverter-based DGs considering line impedance impact in microgrid networks
TL;DR: In this article, a robust controller for parallel-connected inverters of DGs in an islanded microgrid is presented, considering effect of line impedance, and a new approach based on robust control design method, H∞ loop-shaping design (HLSD) procedure, is presented.
Journal ArticleDOI
Decentralized and Real-Time Power Dispatch Control for an Islanded Microgrid Supported by Distributed Power Sources
Changsun Ahn,Huei Peng +1 more
TL;DR: In this paper, a combined system identification-Lagrange function minimization algorithm is proposed to minimize a cost function that can be adjusted to reflect the desire to minimize energy cost and/or losses.
Journal ArticleDOI
An Improved Finite Control Set-MPC-Based Power Sharing Control Strategy for Islanded AC Microgrids
TL;DR: An improved FCS-MPC strategy for paralleled Voltage Source Inverters (VSIs) is introduced, which has the merits of good extensibility, low system cost and compact structure, and the transient response is significantly improved.
Proceedings ArticleDOI
Hierarchical control techniques applied in micro-grid
Hou Chaoyong,Xuehao Hu,Dong Hui +2 more
TL;DR: In this paper, a hierarchical control for micro-grid is proposed, this control method still have a certain degree of decentralization but also keep a degree of centralization through a higher level control layer that controls lower level units.
References
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Journal ArticleDOI
Control of parallel connected inverters in stand-alone AC supply systems
TL;DR: In this article, a control scheme for parallel-connected inverters in a standalone AC supply system is presented, which uses feedback of only those variables that can be measured locally at the inverter and does not need communication of control signals between the inverters.
Book
Power Systems Analysis
TL;DR: In this article, the authors present a model of a single machine-infinite bus (SIB) with three-phase transformer connections for the purpose of detecting faults in a generator.
Journal ArticleDOI
Parallel operation of voltage source inverters
T. Kawabata,S. Higashino +1 more
TL;DR: In this paper, the authors discuss the problem of parallel operating systems of voltage source inverters with other inverters or with the utility source and propose several methods for protection against failure.
Journal ArticleDOI
Sharing of nonlinear load in parallel connected three-phase converters
TL;DR: In this article, a new control method is presented which enables equal sharing of linear and nonlinear loads in three-phase power converters connected in parallel, without communication between the converters.
Proceedings ArticleDOI
Parallel operation of single phase inverter modules with no control interconnections
TL;DR: In this article, the authors developed a control technique for operating two or more single phase inverter modules in parallel with no auxiliary interconnections, using frequency, fundamental voltage, and harmonic voltage droop to allow independent inverters to share the load in proportion to their capacities.