Two Degrees of Freedom Active Damping Technique for  $LCL$ Filter-Based Grid Connected PV Systems

Hanif, Muhammad; Khadkikar, Vinod; Xiao, Weidong; Kirtley, James L.

doi:10.1109/tie.2013.2274416

Cited by 178 publications

(95 citation statements)

References 12 publications

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“…It has been proved that a resistor connected in parallel with the filter capacitor has an optimal magnitude characteristic for damping both in low and high frequency ranges, but collateral effects of high power losses are unaffordable [3]. To overcome this drawback, various active damping strategies are proposed to substitute the physical resistor by adding a feedback in the controller, which can be proportional to the capacitor current [4][5][6], or to the first-order differential of capacitor voltage [7], or to the second-order differential of the gridside current [8,9]. All of these damping strategies can be applied as a virtual resistor with the equivalently optimal performance, but proportional computation is more accurate compared with differential approximation in digital controller.…”

Section: Introductionmentioning

confidence: 99%

Stability of LCL-filtered grid-connected inverters with capacitor current feedback active damping considering controller time delays

Xia

Kang

2017

J. Mod. Power Syst. Clean Energy

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This paper investigates the stability of LCL-filtered grid-connected inverters with capacitor current feedback (CCF) active damping. The impact of time delays in the digital controller on active damping and its equivalent virtual impedance is analyzed. The inherent relationship between these time delays and stability is illustrated. Specially, a critical value of the CCF active damping coefficient k damp_c is proposed to define three distinct regions of stability evaluation. If k damp_c [ 0, a sufficient but smaller damping coefficient (k damp \ k damp_c ) is recommended as optimum damping solution; if k damp_c = 0, system will be unstable irrespective of active damping; and if k damp_c \ 0, active damping is not necessary to design a stable system. Necessary conditions to ensure stability are identified; guidelines for controller design are then presented to optimize the performance of active damping and dynamic response. Simulation and experimental results confirm the presented analysis.

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Section: Introductionmentioning

confidence: 99%

Stability of LCL-filtered grid-connected inverters with capacitor current feedback active damping considering controller time delays

Xia

Kang

2017

J. Mod. Power Syst. Clean Energy

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“…With this method, the injected current is not controlled directly and the damping capability relies on the LCL parameters. Therefore, among the AD methods, the method involving feedback of the capacitor current has attracted considerable attention due to its simple implementation and wide application [2], [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Stationary Frame Current Control Evaluations for Three-Phase Grid-Connected Inverters with PVR-based Active Damped LCL Filters

Han¹,

Shen²,

Guerrero³

2016

Journal of Power Electronics

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Grid-connected inverters (GCIs) with LCL output filter have the ability of attenuating high-frequency (HF) switching ripples. However, by using only grid-current control, the system is prone to resonances if it is not properly damped, and the current distortion would be amplified significantly under highly distorted grid conditions. In this paper, a synchronous reference frame equivalent proportional-integral (SRF-EPI) controller in αβ stationary frame using the parallel virtual resistance-based active damping (PVR -AD) strategy for grid-interfaced distributed generation (DG) systems to suppress the LCL resonance is proposed. Although both proportional-resonant (PR) controller in αβ stationary frame and PI controller in dq synchronous frame achieve zero steady-state error, the amplitude-and phase-frequency characteristics differ greatly from each other except for the reference tracking at fundamental frequency. Therefore, an accurate SRF-EPI controller in αβ stationary frame is established to achieve precise tracking accuracy. Moreover, the robustness, harmonic rejection capabilities, and influence of control delay are investigated by the Nyquist stability criterion when the PVR-based AD method is adopted. Furthermore, the grid voltage feed-forward and multiple PR controllers are integrated in the current loop to mitigate the current distortion introduced by the grid background distortion. Besides, the parameters design guidelines are presented to show the feasibility and effectiveness of the proposed strategy. Finally, simulation and experimental results are provided to validate the feasibility of the proposed control approach.

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“…The RTs also enables inexpensive verification of new control algorithms [10,11,16], and is particularly useful for testing systems such as HVDC or STATCOM before connecting these devices in the field [10,15,17,18]. Validation of control systems using the FPGA-based RTs model can be realized as: the tested control system and the physical model of the object (BLDC motor) are implemented in a single FPGA chip (Fig.…”

Section: Introductionmentioning

confidence: 99%

Low cost, high accuracy real-time simulation used for rapid prototyping and testing control algorithms on example of BLDC motor

Baszyński

2016

Archives of Electrical Engineering

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This article presents the simulation of a BLDC motor and its closed control system in FPGA. The simulation is based on a mathematical model of the motor, including the electromagnetic torque, phase currents, back electromotive force, etc. In order to ensure calculation precision, the equations describing the motor were solved using a floating point representation of real numbers, and a small step of numerical calculations of 1 μs was assumed. The time step selection methodology has been discussed in detail. The motor model was executed with the use of Textual Programming Languages (with HDL codes).

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Two Degrees of Freedom Active Damping Technique for $LCL$ Filter-Based Grid Connected PV Systems

Cited by 178 publications

References 12 publications

Stability of LCL-filtered grid-connected inverters with capacitor current feedback active damping considering controller time delays

Stability of LCL-filtered grid-connected inverters with capacitor current feedback active damping considering controller time delays

Stationary Frame Current Control Evaluations for Three-Phase Grid-Connected Inverters with PVR-based Active Damped LCL Filters

Low cost, high accuracy real-time simulation used for rapid prototyping and testing control algorithms on example of BLDC motor

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