Robust Control of Grid-Tied Parallel Inverters Using Nonlinear Backstepping Approach

Ahmad, Aftab; Ullah, Nasim; Ahmed, Nisar; Ibeas, Asier; Mehdi, Ghulam; Herrera, Jorge; Ali, Anwar

doi:10.1109/access.2018.2875030

Cited by 25 publications

(8 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to achieve wide range operations, researchers have proposed different types of non-linear control techniques [8][9][10][11]. Out of these, sliding mode (SM) control is well known for being robust and parameter-invariant [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Robust Sliding Mode Control of a Unipolar Power Inverter

et al. 2021

View full text Add to dashboard Cite

The key issue in the practical implementation of the sliding mode (SM) control–based power inverter is the variable switching frequency. This variable switching frequency not only induces electromagnetic interference (EMI) noise, but also reduces the efficiency of the inverter, as the size of the inductor and capacitor does not alter in tandem with this variable frequency. In this context, fixed switching frequency–based SM control techniques are proposed; however, some of them are too complex, while others compromise the inherent properties of SM control. In this research, a fixed frequency SM controller is proposed, which is based on the novel low-pass filter extraction of the discontinuous control signal. This allows the technique to be implemented with fewer hardware components, thus reducing the complications of implementation, while maintaining the robustness and parametric invariance of SM control. A simulation-based comparison with an existing pulse width modulated (PWM) SM controller is presented as the benchmark. In comparison with the sigmoid function SM controller, an improvement of 50% in the settling time along with zero steady-state errors and a further 37% and 42% improvement in the undershoot and overshoot, respectively, is reported in the simulation. A hardware setup is established to validate the proposed technique, which substantiates the simulation results and its disturbance rejection properties.

show abstract

Section: Introductionmentioning

confidence: 99%

Robust Sliding Mode Control of a Unipolar Power Inverter

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The fast penetration of RES, such as Photovoltaics (PVs), increases the popularity of DC-AC power converters at gridconnected applications [1][2][3][4][5]. However, the new PV architectures have independent PV modules with low input voltages [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Single-Stage Three-Phase Grid-Tied Isolated SEPIC-Based Differential Inverter With Improved Control and Selective Harmonic Compensation

2020

View full text Add to dashboard Cite

The simple circuit based on DC-DC converters is the main attractive feature of the differential inverter topologies. It has a single-stage and provides modularity and scalability. However, the Negative Sequence Harmonic Component (NSHC) generated at the output terminal may hinder its practical applications. This paper presents a single-stage three-phase isolated differential inverter based on three High-Frequency Link (HFL) transformer-based DC-DC SEPIC converters. The utilized SEPIC converters perform voltage step-up/ down capability with galvanic isolation, which is essential for Renewable Energy Sources (RES). It mitigates the Common-Mode Voltage (CMV) and ElectroMagnetic Interference (EMI). Moreover, this paper proposes a two-loop based d-q synchronous frame grid-current control to mitigate its NSHC. A Type-II compensator and simple NSHC detection circuit are proposed to enhance the inverter's stability and compensate phase-delay of the utilized SEPIC converters. NSHC detection is developed using three cascaded Low Path Filters (LPFs). A 1.6kW inverter prototype was set to validate the performance of the proposed inverter and its control. The control is implemented by the MWPE3 C6713A Expert III DSP board. The proposed topology has a maximum efficiency of 89.744 at 700W output power and 86.4% at full power. The proposed control decreases the NSHC from 40.6 % to 1.614%, which shows its accuracy and precision. Furthermore, THD is reduced from 35.61% to 4.087% and satisfy the recent grid codes (<5%). The simulation results using PSIM software, power loss distribution, and a comparison study of the proposed inverter with similar topologies are also presented.

show abstract

“…The penetration of RES in the power grid is increasing at a very encouraging rate. RES are generally connected to the grid through grid-connected power converters [1]- [7]. Grid-connected converters are also used in various other power and energy systems applications, e.g.…”

Section: Introductionmentioning

confidence: 99%

Robust Gradient Estimator for Unknown Frequency Estimation in Noisy Environment: Application to Grid-Synchronization

et al. 2020

View full text Add to dashboard Cite

This work was supported by the U.K. Biotechnology and Biological Sciences Research Council through the Magnetic and Wireless Sensor Technology for improving profit, biosecurity and carbon footprint of regional oyster production (NOSy) under Grant BB/S004203/1. Data availability: The datasets and models generated during the current study are available from the corresponding author on reasonable request.

show abstract

Robust Control of Grid-Tied Parallel Inverters Using Nonlinear Backstepping Approach

Cited by 25 publications

References 34 publications

Robust Sliding Mode Control of a Unipolar Power Inverter

Robust Sliding Mode Control of a Unipolar Power Inverter

Single-Stage Three-Phase Grid-Tied Isolated SEPIC-Based Differential Inverter With Improved Control and Selective Harmonic Compensation

Robust Gradient Estimator for Unknown Frequency Estimation in Noisy Environment: Application to Grid-Synchronization

Contact Info

Product

Resources

About