Capacitor Current Feedback-Based Active Resonance Damping Strategies for Digitally-Controlled Inductive-Capacitive-Inductive-Filtered Grid-Connected Inverters

Lorzadeh, Iman; Abyaneh, Hossein Askarian; Savaghebi, Mehdi; Bakhshai, Alireza; Guerrero, Josep M.

doi:10.3390/en9080642

Cited by 30 publications

(21 citation statements)

References 59 publications

(267 reference statements)

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“…Figure 10b shows the corresponding control block diagrams. The capacitor current feedback (CCF) active damping method is chosen due to its effective damping performance and simple application [38]. A PR controller, instead of the proposed controller, is used to analyze the system stability.…”

Section: Methods Transfer Functionmentioning

confidence: 99%

Performance Improvement for Two-Stage Single-Phase Grid-Connected Converters Using a Fast DC Bus Control Scheme and a Novel Synchronous Frame Current Controller

Huang

Chen

2017

Energies

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Two-stage single-phase grid-connected converters are widely used in renewable energy applications. Due to the presence of a second harmonic ripple across the DC bus voltage, it is very challenging to design the DC bus voltage control scheme in single-phase grid-connected inverters. The DC bus voltage controller must filter the ripple and balance a tradeoff between low harmonic distortion and high bandwidth. This paper presents a fast DC bus voltage controller, which uses a second order digital finite impulse response (FIR) notch filter in conjunction with input power feedforward scheme to ensure the steady-state and dynamic performance. To gain the input power without extra hardware, a Kalman filter is incorporated to estimate the DC bus input current. At the same time, a modulation compensation strategy is implemented to eliminate the nonlinearity of the grid current control loop, which is caused by the DC bus voltage ripple. Moreover, a novel synchronous frame current controller for single-phase systems is also introduced, and its equivalent model in stationary frame has been derived. Simulation and experimental results are provided to verify the effective of the proposed control scheme.

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Section: Methods Transfer Functionmentioning

confidence: 99%

Performance Improvement for Two-Stage Single-Phase Grid-Connected Converters Using a Fast DC Bus Control Scheme and a Novel Synchronous Frame Current Controller

Huang

Chen

2017

Energies

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“…In order to damp the resonance of the LCL filter, active and passive damping is utilized. The current of the capacitor or inverter side inductor is usually used for active damping [32,33]. In this paper, the inductor current feedback and a proportional controller (K D ) are employed as the third and damping part of the flexible controller.…”

Section: Proposed Flexible Controller For Unbalance and Harmonic Compmentioning

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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“…There are mainly two situations. First, for grid-side current control, feeding back converter-side current [22] or capacitor current [23,24] can both achieve good damping effect. In [22], the current control loop is double-loop structure.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Enhanced Error-Free Current Control Strategy for Inverter with Virtual Resistor Damping

et al. 2018

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In microgrid, the grid-connected inverter current with the LCL (inductor-capacitor-inductor) output filter is amplified at certain frequencies. Using virtual resistor damping method can help suppress the amplification. By choosing an appropriate virtual resistor value, the model of the inverter current control loop is simplified as a 2 nd -order lowpass filter. Based on such simplified model, this paper proposes a design method of reference current compensation controller, which does not require decomposition of harmonic components. With the reference compensation, the inverter output current control precision is improved obviously. The simulation and experimental results verify the accuracy of the inverter simplified model and effectiveness of the reference compensation design method.

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Capacitor Current Feedback-Based Active Resonance Damping Strategies for Digitally-Controlled Inductive-Capacitive-Inductive-Filtered Grid-Connected Inverters

Cited by 30 publications

References 59 publications

Performance Improvement for Two-Stage Single-Phase Grid-Connected Converters Using a Fast DC Bus Control Scheme and a Novel Synchronous Frame Current Controller

Performance Improvement for Two-Stage Single-Phase Grid-Connected Converters Using a Fast DC Bus Control Scheme and a Novel Synchronous Frame Current Controller

Flexible Compensation of Voltage and Current Unbalance and Harmonics in Microgrids

Modeling and Enhanced Error-Free Current Control Strategy for Inverter with Virtual Resistor Damping

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