Dual-inverter for grid-connected photovoltaic system: Modeling and sliding mode control

Pires, V. Fernão; Martins, João; Chen, Hao

doi:10.1016/j.solener.2012.04.012

Cited by 65 publications

(8 citation statements)

References 26 publications

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“…As shown in Fig. 8a, a PLL is used to impose internal frequency synchronisation and set the reference frequency [36,37]. Unlike in P-f droop, where system dynamics mainly depend on the low-pass lter of the power controller, the dynamics of the proposed control scheme is mainly dependent on the VI and the line impedances.…”

Section: Adaptive Virtual Resistance Load Sharing Schemementioning

confidence: 99%

Adaptive virtual resistance load sharing for resistive microgrids

Egwebe

Fazeli

Holland

2018

Electric Power Systems Research

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is paper proposes an adaptive virtual resistance load sharing method in αβ frame, where the α-component of the virtual resistance is used to share the active power and the β-component of the virtual resistance is used to share reactive power. Using the proposed method for photovoltaic systems makes the active and reactive power sharing sensitive to the varying nature of the solar energy. It will be shown that the proposed adaptive active power sharing signi cantly reduces the energy required from a fossil-fuelled auxiliary generator. e proposed adaptive reactive power sharing reduces the reactive power exchanged with the auxiliary generator and the switching stress on each distributed generator's converter through, seamlessly, reducing the reactive power contribution of the units with higher active power contribution. is is all achieved without any communication between distributed generation units. Whilst the proposed method is also applicable on inductive microgrids, this paper focuses on a resistive microgrid since most microgrids are likely to be located on the low voltage side of the grid (where the network is mainly resistive). Di erent load sharing methods in a resistive microgrid are also categorized and brie y reviewed to justify the chosen approach in the paper. MATLAB/SIMULINK simulations are used to validate the proposed method.

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Section: Adaptive Virtual Resistance Load Sharing Schemementioning

confidence: 99%

Adaptive virtual resistance load sharing for resistive microgrids

Egwebe

Fazeli

Holland

2018

Electric Power Systems Research

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“…However, this structure has the disadvantage of requiring two DC voltage sources. Using the open-end windings and two 3-phase VSIs, several works have been presented, proposing several control and modulation methods [32][33][34]. Based on the usage of motors with open-end windings and two 3-phase VSIs, other topologies, such as the ones presented in [35,36], were developed.…”

Section: Introductionmentioning

confidence: 99%

Dual 3-Phase Bridge Multilevel Inverters for AC Drives with Voltage Sag Ride-through Capability

2019

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One of the main power quality issues that can affect variable speed drives (VSDs) is the occurrence of voltage sags on their AC power supply. Voltage sags can affect the inverter nominal operation, leading to a malfunction of the AC motor. This paper presents an inverter with resilient capability to voltage sags. The topology consists of two conventional three-phase bridge inverters arranged to require just a single DC source. This inverter is also characterized by a voltage multilevel operation, providing the full advantages of multilevel converters without the need for level balancing. Associated with this AC motor driver, a control system based on a field-oriented controller with a vector voltage modulator that will enable voltage sag ride-through capability is proposed. The proposed control system does not require any changes in the occurrence of voltage sags. To verify the characteristics of the proposed drive and control system, simulation tests are provided. Simulation results confirm the voltage sag resilient capability of the proposed multilevel converter.

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“…However, there are few papers considering the selection or design of the filters used in DI-OEWT-based grid-tied applications at present. In [23][24][25][26][27][28], single inductor filter was adopted in these DI-OEWT based grid-tied systems, which is obviously not a good choice. Owing to the weak harmonic suppression capability, it needs a large inductance value to meet the grid standard.…”

Section: Introductionmentioning

confidence: 99%

Research on the Filters for Dual-Inverter Fed Open-End Winding Transformer Topology in Photovoltaic Grid-Tied Applications

et al. 2019

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Owing to the necessity of the transformer for the multi-parallel inverters connected to the medium-voltage (MV) grid, the conventional multi-parallel inverter topology can be reconfigured to the dual-inverter fed open-end winding transformer (DI-OEWT) topology to obtain lower output voltage harmonics, which can reduce the requirement of the filter inductance. However, due to the special structure of the DI-OEWT topology, the arrangement scheme of the filter can be more than one kind, and different schemes may affect the filter performance. In this paper, research on the existing two kinds of filters, as well as a proposed one, for the DI-OEWT topology used in photovoltaic grid-tied applications is presented. The equivalent circuits of these filters are derived, and based on this, the harmonic suppression capability of these filters is analyzed and compared. Furthermore, a brief parameter design method of these filters is also introduced, and based on the design examples, the inductance and capacitance requirements of these filters are compared. In addition, these filters are also evaluated in terms of the applicability for fault tolerance. At last, the analysis is verified through an experiment on a 30 kW dual-three-level inverter prototype.

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Dual-inverter for grid-connected photovoltaic system: Modeling and sliding mode control

Cited by 65 publications

References 26 publications

Adaptive virtual resistance load sharing for resistive microgrids

Adaptive virtual resistance load sharing for resistive microgrids

Dual 3-Phase Bridge Multilevel Inverters for AC Drives with Voltage Sag Ride-through Capability

Research on the Filters for Dual-Inverter Fed Open-End Winding Transformer Topology in Photovoltaic Grid-Tied Applications

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