Review of control techniques for inverters parallel operation

Mohd, A.; Ortjohann, E.; Morton, D.; Omari, Osama

doi:10.1016/j.epsr.2010.06.009

Cited by 153 publications

(90 citation statements)

References 51 publications

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“…The peer-to-peer control strategy provides the inherent advantage of seamless mode switching within micro-grids as in [4][5][6][7][8][9][10][11]. Linear droop control technology in peer-to-peer strategy for inverters can be consistent in grid-connected mode or islanded mode, potentially sharing load power automatically.…”

Section: Introductionmentioning

confidence: 99%

Secondary Frequency Automatic Control Method for Micro-grid Inverters

Huang¹,

Xu²,

Li³

et al. 2017

Proceedings of the 2017 International Conference on Electronic Industry and Automation (EIA 2017)

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Abstract-Micro-grid is as an effective technology for controlling the influx of distributed generations and improving the percentage of renewable energy generation, both of which are researched all over the world. The traditional linear droop control is important for micro-grids in order to realize the plug and play characteristics. According to the defects of traditional linear droop control technology applied in DGs dealing with a large load demand fluctuation with the result of a larger frequency deviation problem, a new droop control method was presented. The new droop curve design is based on secondary frequency operations of synchronous generator trajectory, and the total frequency range was divided into segments, which consist of qualified and unqualified frequency segments by only primary frequency control. Through segmented design, the traditional primary frequency droop control is still used in the qualified frequency segment to keep the advantage of droop control. While in the unqualified frequency segment, the mathematical mapping function is built to project from the defect zone controlled by primary frequency operation to the aim projection zone controlled by secondary frequency operation. The mapping function builds the negative feedback relation between the source output power and frequency deviation to implement the automatic operation of secondary control. By means of the location set of projection points and the known droop coefficient value, the new nominal operation point can be located, which can be changed according to the load demand fluctuation in real time. The test in MATLAB/Simulink environments was carried out, and the results verified the validity of the auto-secondary control strategy, which deals with large load demand.

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Section: Introductionmentioning

confidence: 99%

Secondary Frequency Automatic Control Method for Micro-grid Inverters

Huang¹,

Xu²,

Li³

et al. 2017

Proceedings of the 2017 International Conference on Electronic Industry and Automation (EIA 2017)

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“…On the other hand, finding the state of art of different control approaches for the parallel inverter operation is not easy right now since there are many proposed control strategies in the literature [11,12]. One idea to solve the mismatching losses in PV system practice is to provide module, string and central based MPPT configurations.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of photovoltaic array through string and central based MPPT system under non-uniform irradiance conditions

Syafaruddin

Karatepe

Hiyama

2012

Energy Conversion and Management

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“…Microgrid (MG) and Distributed Generation DG concepts have emerged for better use of the RESs and enhancing efficiency, power quality and reliability of the conventional power systems [4,5]. Since the output voltage of many of the RESs are unregulated DC or variable/high frequency AC, the integration of renewable energy to the utility grids or MGs requires power electronic converters, with an inverter as the last conversion stage in case of AC systems [6]. These inverters are usually connected to the grid by an LCL or LC filter [7,8].…”

Section: Introductionmentioning

confidence: 99%

Flexible Compensation of Voltage and Current Unbalance and Harmonics in Microgrids

et al. 2017

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Abstract:In recent years, the harmonics and unbalance problems endanger the voltage and current quality of power systems, due to increasing usage of nonlinear and unbalanced loads. Use of Distributed Generation (DG)-interfacing inverters is proposed for voltage or current compensation. In this paper, a flexible control method is proposed to compensate voltage and current unbalance and harmonics using the distributed generation (DG)-interfacing inverters. This method is applicable to both grid-connected and islanded Microgrids (MGs). In the proposed method, not only the proper control of active and reactive powers can be achieved, but also there is flexibility in compensating the voltage or current quality problems at DG terminals or Points of Common Coupling (PCCs). This control strategy consists of active and reactive power controllers and a voltage/current quality-improvement block. The controller is designed in a stationary (αβ) frame. An extensive simulation study has been performed and the results demonstrate the effectiveness of the proposed control scheme. Depending on the compensation modes, the harmonics and unbalance compensation of DG output current, MG-injected current to the grid, as well as PCC and DG voltages, can be achieved in grid-connected operation of MG while in the islanded operation, and the PCC and DG voltages compensation can be obtained through the proposed control scheme.

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Review of control techniques for inverters parallel operation

Cited by 153 publications

References 51 publications

Secondary Frequency Automatic Control Method for Micro-grid Inverters

Secondary Frequency Automatic Control Method for Micro-grid Inverters

Performance enhancement of photovoltaic array through string and central based MPPT system under non-uniform irradiance conditions

Flexible Compensation of Voltage and Current Unbalance and Harmonics in Microgrids

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