Filter‐based perturbation control of low‐frequency oscillation in voltage‐mode H‐bridge DC–AC inverter

Lu, Weiguo; Zhao, Naikuan; Wu, Junke; Aroudi, Abdelali El; Zhou, Luowei

doi:10.1002/cta.1977

Cited by 11 publications

(11 citation statements)

References 20 publications

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“…A SISO block diagram has been used (Figure ) to design the controller. The change of the load current I O is treated as the disturbance, as in Lu et al , where the problem of the low‐frequency oscillations after the step decrease of the load is analysed. To solve the further problem of the microprocessor discrete control, the discrete SISO has been calculated for the transformed plant control transfer function using the bilinear transform for the sampling period T c = 1/25 600.…”

Section: Control System Examples Based On the Presented Modelssupporting

confidence: 52%

The dynamic properties of a single‐phase transformer‐based inverter for ups systems

Rymarski

Bernacki

2015

Circuit Theory & Apps

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SUMMARYThis paper presents two algorithms for the creation of an analytical model of a single-phase transformerbased inverter, using either the measurements of the control frequency-dependent characteristics of the inverter or the initial in-circuit frequency-dependent measurements of the transformer. The paper discusses how the parameters of the line transformer influence the dynamic properties of the inverter and, as a consequence, the design of the instantaneous control feedback loop. Line transformers, widely used in industry, have not yet been analysed for use at higher than normal operating frequencies. The basic parameters of the transformer are the nonlinear functions of the primary voltage amplitude and frequency. The paper includes verification of both methods using the breadboard experimental model. In the final step, the inverter control transfer functions are calculated. To show the utility of both models, an exemplary discrete controller for the experimental inverter model has been designed and tested.

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Section: Control System Examples Based On the Presented Modelssupporting

confidence: 52%

The dynamic properties of a single‐phase transformer‐based inverter for ups systems

Rymarski

Bernacki

2015

Circuit Theory & Apps

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“…However, the LCL parameters always change in practice. Thus, there is no accurate solution for (22), and the robustness is difficult to guarantee.…”

Section: ) Case Ii: the Inner Ad Control Is Unstablementioning

confidence: 99%

“…Therefore, this paper aims to provide a deep study of such AD. The model of a digital control system is more complex than that of the analog control system in [22]. This study focuses on the dynamics and stability at frequencies below the control frequency.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis and Improvement of the Capacitor Current Active Damping of the LCL Filters in Grid-Connected Applications

Xu¹,

Xie²,

Zhang³

2016

Journal of Power Electronics

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For grid-connected LCL-filtered inverters, dual-loop current control with an inner-loop active damping (AD) based on capacitor current feedback is generally used for the sake of current quality. However, existing studies on capacitor current feedback AD with a control delay do not reveal the mathematical relation among the dual-loop stability, capacitor current feedback factor, delay time and LCL parameters. The robustness was not investigated through mathematical derivations. Thus, this paper aims to provide a systematic study of dual-loop current control in a digitally-controlled inverter. At first, the stable region of the inner-loop AD is derived. Then, the dual-loop stability and robustness are analyzed by mathematical derivations when the inner-loop AD is stable and unstable. Robust design principles for the inner-loop AD feedback factor and the outer-loop current controller are derived. Most importantly, ensuring the stability of the inner-loop AD is critical for achieving high robustness against a large grid impedance. Then, several improved approaches are proposed and synthesized. The limitations and benefits of all of the approaches are identified to help engineers apply capacitor current feedback AD in practice.

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“…Three-phase unbalanced conditions are readily observed in a microgrid system [1][2][3][4][5][6][7] that incurs loss and potentially leads to stability issues [8][9][10][11][12][13][14][15]. Three-phase unbalanced conditions are readily observed in a microgrid system [1][2][3][4][5][6][7] that incurs loss and potentially leads to stability issues [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Microgrids are the key components of the future smart grids, which accommodate distributed generation (DG) and dynamically connected and disconnected loads in either grid-connected or islanded operation mode. Three-phase unbalanced conditions are readily observed in a microgrid system [1][2][3][4][5][6][7] that incurs loss and potentially leads to stability issues [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Modeling of unbalanced three‐phase driving‐point impedance with application to control of grid‐connected power converters

Wong

Tse

et al. 2015

Circuit Theory & Apps

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The dq transformation is widely used in the analysis and control of three-phase symmetrical and balanced systems. The transformation is the real counterpart of the complex transformations derived from the symmetrical component theory. The widespread distributed generation and dynamically connected unbalanced loads in a three-phase system inherently create unbalanced voltages to the point of common coupling. The unbalanced voltages will always be transformed as coupled positive-sequence and negative-sequence components with double-frequency ripples that can be removed by some filtering algorithms in the dq frame. However, a technique for modeling unbalanced three-phase impedance between voltages and currents of same sequences or of opposite sequences is still missing. We propose an effective method for modeling unbalanced three-phase impedance using a decoupled zero-sequence impedance and two interacting positive-sequence and negative-sequence balanced impedances in the dq frame. The proposed method can decompose a system with unbalanced resistance, inductance, or capacitance into a combination of independent reciprocal bases (IRB). Each IRB basis belongs to one of the positive-sequence, negative-sequence, or zero-sequence system components to facilitate further analysis. The effectiveness of this approach is verified with a case study of an unbalanced load and another case study of an unbalanced voltage compensator in a microgrid application.

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Filter‐based perturbation control of low‐frequency oscillation in voltage‐mode H‐bridge DC–AC inverter

Cited by 11 publications

References 20 publications

The dynamic properties of a single‐phase transformer‐based inverter for ups systems

The dynamic properties of a single‐phase transformer‐based inverter for ups systems

Stability Analysis and Improvement of the Capacitor Current Active Damping of the LCL Filters in Grid-Connected Applications

Modeling of unbalanced three‐phase driving‐point impedance with application to control of grid‐connected power converters

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