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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Journal ArticleDOI
Hybrid Voltage and Current Control Approach for DG-Grid Interfacing Converters With LCL filters
Jinwei He,Yun Wei Li +1 more
TL;DR: The proposed hybrid voltage and current control method allows the coordinated closed-loop control of the DG unit fundamental voltage and line harmonic currents and guarantees smooth transition during the grid-connected/islanding operation mode transfer.
Journal ArticleDOI
Hybrid AC–DC Microgrids With Energy Storages and Progressive Energy Flow Tuning
TL;DR: In this article, a control scheme for the hybrid microgrids is developed, which can operate efficiently with progressive energy flow tuning and no requirement for fast communication links, and a plug-in scheme is also proposed for progressive and selective charging/discharging of storages for energy smoothing and ride-through purposes.
Journal ArticleDOI
Virtual Flux Droop Method—A New Control Strategy of Inverters in Microgrids
TL;DR: In this article, the authors proposed a new control strategy in microgrid applications by drooping the virtual flux instead of the inverter output voltage, which can achieve active and reactive power sharing with much lower frequency deviation than the conventional voltage droop method.
Journal ArticleDOI
Distributed Voltage and Frequency Control of Offshore Wind Farms Connected With a Diode-Based HVdc Link
TL;DR: In this article, a new technique for the distributed voltage and frequency control of the local ac-grid in offshore wind farms based on synchronous generators is introduced, which allows the connection of the offshore wind farm using a diode-based HVdc rectifier.
Journal ArticleDOI
Dynamic Stability Analysis of Synchronverter-Dominated Microgrid Based on Bifurcation Theory
TL;DR: A nonlinear model of a synchronverter-dominated microgrid is presented, using Bifurcation theory to predict and describe the unstable phenomenon as the system parameters fluctuate and the effect of these parameters on the system stability is examined.
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.