Single Phase Current Source Inverter With Multiloop Control for Transformerless Grid–PV Interface

Rajeev, Mini; Agarwal, Vivek

doi:10.1109/tia.2017.2788414

Cited by 51 publications

(20 citation statements)

References 21 publications

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“…Grid voltage is assumed to be fixed, thus the active and reactive power of the inverter exchanges in reference to the grid are regulated by regulating the d-q quantities of output current directly. The reference current, i * o(dq) that needs to be injected into the grid is expressed in (5). [20].…”

Section: Literature Review: Three-phase Current Source Inverter Systemmentioning

confidence: 99%

Current control of grid connected three phase current source inverter based on medium power renewable energy system

Azmi¹,

Adam²,

Rahim³

et al. 2021

IJATEE

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Current source inverter (CSI) features simple converter structure and inherent voltage boost capability. In addition, it provides low instantaneous rate of voltage change with respect to time in comparison to voltage source inverter (VSI) and multilevel inverter (MLI). Nonetheless, CSI does not outshine as grid interfacing unit in photovoltaic (PV) generation system. This is because of requirement of large sizing of dc-link inductor and sluggish performance during light load condition. Contemplating both advantages and disadvantages of CSI, this work is aimed to investigate and analyze the superiority of CSI in PV system. The proposed system employs direct regular-sampled pulse width modulation (DRSPWM) as modulator and multi-loop proportional-integral (PI) in synchronous frame as the controller. The gridconnected CSI system is further evaluated along with photovoltaic maximum power point tracking (PV-MPPT) control.Simulation verification highlighted that the option of using CSI as medium power PV grid integration unit in exchanging active-reactive power with grid network is very satisfactory. In addition, balanced sinusoidal output currents with acceptable harmonic limit are successfully achieved; like other topologies in PV grid integration. The proposed CSI system is proved to be able to track the references in event of varying input condition from PV array. The theoretical equations and modeling are described, and the simulation are conducted in MATLAB / Simulink platform.

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Section: Literature Review: Three-phase Current Source Inverter Systemmentioning

confidence: 99%

Current control of grid connected three phase current source inverter based on medium power renewable energy system

Azmi¹,

Adam²,

Rahim³

et al. 2021

IJATEE

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show abstract

“…The basic concepts and operations are different for each inverter. Some CSI topologies have been shown in recent research [72][73][74]. Nowadays, CSI topologies try to reduce the leakage current, such as H5 [75], H6 [76] and HERIC [77].…”

Section: H5 H6 and Heric Invertersmentioning

confidence: 99%

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

et al. 2020

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The rise in renewable energy has increased the use of DC/AC converters, which transform the direct current to alternating current. These devices, generally called inverters, are mainly used as an interface between clean energy and the grid. It is estimated that 21% of the global electricity generation capacity from renewable sources is supplied by photovoltaic systems. In these systems, a transformer to ensure grid isolation is used. Nevertheless, the transformer makes the system expensive, heavy, bulky and reduces its efficiency. Therefore, transformerless schemes are used to eliminate the mentioned disadvantages. One of the main drawbacks of transformerless topologies is the presence of a leakage current between the physical earth of the grid and the parasitic capacitances of the photovoltaic module terminals. The leakage current depends on the value of the parasitic capacitances of the panel and the common-mode voltage. At the same time, the common-mode voltage depends on the modulation strategy used. Therefore, by the manipulation of the modulation technique, is accomplished a decrease in the leakage current. However, the connection standards for photovoltaic inverters establish a maximum total harmonic distortion of 5%. In this paper an analysis of the common-mode voltage and its influence on the value of the leakage current is described. The main topologies and strategies used to reduce the leakage current in transformerless schemes are summarized, highlighting advantages and disadvantages and establishing points of comparison with similar topologies. A comparative table with the most important aspects of each converter is shown based on number of components, modes of operation, type of modulation strategy used, and the leakage current value obtained. It is important to mention that analyzed topologies present a variation of the leakage current between 0 to 180 mA. Finally, the trends, problems, and researches on transformerless grid-connected PV systems are discussed.

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“…In practical PV grid-connected systems, the dc side should be able to achieve a wide range of MPPT control, while the ac side can achieve grid-connected power generation while it should also be able to provide reactive power compensation [27][28][29][30]. In order to obtain the above control objectives, the PV grid-connected system-based CSC requires that its dc current should be controllable over a wide range, and the amplitude of ac current can continuously change from 0 to the rated value, and the phase angle of ac current can freely regulate from +90° to −90°.…”

Section: Non-linear Control Of the Pv Systemmentioning

confidence: 99%

Implementation of a new high‐power current‐source single‐stage PV grid‐connected system with reactive power compensation

Liu

Wang

2019

IET Renewable Power Generation

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In view of the shortcoming of voltage source converter in the application of high-power photovoltaic (PV) gridconnected system, this study designs a new single-stage current source PV grid-connected system based on dc current reinjection conversion. The system can freely control the dc current in a wide range, so only one stage of conversion is needed to achieve wide range control of the dc side maximum power point tracking. The amplitude and phase angle of the ac output current can be freely regulated, so it is able to realise grid-connected power generation under unit power factor and supply a certain amount of reactive power according to the control order while grid-connected power generation. Meanwhile, the new current source converter topology eliminates the ac capacitors which are arranged between the converter and the power grid, and gets approximately sinusoidal ac currents without setting filters. This study describes the circuit structure and control of the PV grid-connected system, and builds an experimental prototype. The simulation and experimental results will be shown to demonstrate the feasibility of the converter topology, and the effectiveness of the control strategy.

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Single Phase Current Source Inverter With Multiloop Control for Transformerless Grid–PV Interface

Cited by 51 publications

References 21 publications

Current control of grid connected three phase current source inverter based on medium power renewable energy system

Current control of grid connected three phase current source inverter based on medium power renewable energy system

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

Implementation of a new high‐power current‐source single‐stage PV grid‐connected system with reactive power compensation

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