Integrated Solution for Microgrid Power Quality Assurance

Nine-Switch Inverter (NSI) is composed of two conventional inverters with three common switches. Two sets of three phase ac loads can be connected to the outputs of NSI and independently controlled without any undesirable interaction. In conventional multi-step Model Predictive Control (MPC) of a nine-switch inverter, the prediction steps of both load stages must be equal. Unfortunately, this results in losing the freedom of selecting independent prediction horizon for individual loads. To overcome this problem, a novel asymmetrical multi-step direct model predictive control method is presented in this paper. The proposed method finds two independent optimum solutions for each load to match with their utilization profile. It is assumed that two individual loads are controlled by two separate virtual inverters, and two separate model predictive control problems with their own prediction steps are solved to identify optimum control actions. The control calculations are performed in a Cyclone IV Field Programmable Gate Array (FPGA) by using a pipelined architecture. The system stability is analyzed using Lyapunov stability method. To highlight the effectiveness of introduced strategy, mathematical proof for controlling two separate loads with an asymmetrical prediction step is validated in experimentally. INDEX TERMS Model predictive control, nine-switch inverter, FPGA, digital control, dual-output inverter systems.

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“…The relationship between inverter leg voltages and dc-link voltage for upper load stage and lower load stage are defined in (3) and (4).…”

Section: A Nine-switch Inverter Modelmentioning

confidence: 99%

“…energy conversion systems. In [1]- [4], uninterruptible power supplies (UPS) and power conditioners interfacing with the utility grid have been presented. In [5], bidirectional Z-Source nine-switch inverter has been used for providing clean power to electrical cars.…”

Section: Introductionmentioning

confidence: 99%

Asymmetrical Multi-Step Direct Model Predictive Control of Nine-Switch Inverter for Dual-Output Mode Operation

Gülbudak

Gökdağ

2019

IEEE Access

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“…Other topologies derived from nine-switch topology such as dual output single phase, four leg inverter, and their applications were presented in [21]- [29]. In [30] for the first time, three switches leg was used as two input dc-dc converter.…”

Section: Three Switches Legsmentioning

confidence: 99%

A New Family of Multi-Input Converters Based on Three Switches Leg

Azizi

Mohamadian

Beiranvand

2016

IEEE Trans. Ind. Electron.

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Multi-terminal converters eliminate using several single-input-single-output converters and simplify their topologies and reduce their cost. In this paper, a new family of multi-input converters based on three switches leg is introduced. Inputs of the proposed converters are similar and they are topologically interchangeable and have boost or buck operation modes. The proposed converter has one output which operates as an inverter. Here, all operating modes of the proposed converters and their effects on each other are investigated, in details. Also, an appropriate switching technique for the converters is given. A detailed comparison between conventional and proposed two-input converters is also presented. A two-input, one-output prototype converter has been implemented to validate the given analyses and to verify the proposed converter's performance. The experimental results are in good agreement with the theoretical and simulated analyses. Index Terms-dc-ac power conversion, multi-input converter, nine-switch inverter, three-switch leg converter.

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“…In summary, the part of reference current for power generation can be derived by (21) and (22); meanwhile, the part of reference current for power quality enhancement can be yielded by (17) and (18). Summation of these two parts forms total reference current, as shown in Fig.…”

Section: Coordinated Control Strategy Of Mfgtis Using Fbd Theorymentioning

confidence: 99%

“…So far, much literature has investigated the topologies and control schemes of single MFGTI [19][20][21], but little of them considered the coordinated control of multiple MFGTIs [22,23].…”

Section: Introductionmentioning

confidence: 99%

Coordinated control of multi‐functional grid‐tied inverters using conductance and susceptance limitation

Zeng

Zhao

2014

IET Power Electronics

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Owing to the numerous non-linear and reactive local loads, the applied grid-tied inverters etc., the quality of power supply of micro-grids becomes a challenging issue need to be highly addressed. As the power quality can significantly affect the secure, stable, effective and economic operation of the micro-grids, the compensation of the harmonic and reactive current in the micro-grids by the use of power quality conditioners and/or advanced control strategies has been highlighted. In this study, the multi-functional grid-tied inverters (MFGTIs) are attempted to interface renewable energy resources and enhance the power quality within the micro-grid. The MFGTIs encompassed with the coordinated control strategy based on the Fryze-Buchholz-Dpenbrock (FBD) theory. Through limiting the harmonic and reactive conductance and susceptance detected by FBD theory, the harmonic and reactive current within the micro-grid can be shared among the MFGTIs in a coordinated and automatic fashion in accordance with their capacities without communication. A set of the experiments based on the microgrid test-bed are carried out and the results confirm the effectiveness and feasibility of the suggested control strategies.

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Integrated Solution for Microgrid Power Quality Assurance

Cited by 29 publications

References 21 publications

Asymmetrical Multi-Step Direct Model Predictive Control of Nine-Switch Inverter for Dual-Output Mode Operation

Asymmetrical Multi-Step Direct Model Predictive Control of Nine-Switch Inverter for Dual-Output Mode Operation

A New Family of Multi-Input Converters Based on Three Switches Leg

Coordinated control of multi‐functional grid‐tied inverters using conductance and susceptance limitation

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