Suppression of Line Voltage Related Distortion in Current Controlled Grid Connected Inverters

Abeyasekera, T.; Johnson, C.M.; Atkinson, David; Armstrong, Matthew

doi:10.1109/tpel.2005.857557

Cited by 159 publications

(83 citation statements)

References 9 publications

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“…The method based on the concept of harmonic impedance, which is to incorporate the grid voltage harmonics in the control loop through an additional feedforward path could also suppress the effects of the unwanted harmonics, would not affect the phase margin. However, the compensation accuracy of this approach is not satisfactory [32]. Fig.…”

Section: Grid Voltage Disturbance Rejectionmentioning

confidence: 96%

“…According to Fig. 6(b), the open-loop transfer function of the PVR-based AD is given by 32 , From (10), it shows that there is no unstable open-loop poles, i.e., P=0. If the PI current controller is used, by using the parameters in Table I, the bode plots of the open-loop transfer function Gopen(s) with AD method when Rd,eq is 0, 8 and 26 is illustrated in Fig.…”

Section: Virtual Resistance Based Active Damping (Ad) Strategymentioning

confidence: 99%

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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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Section: Grid Voltage Disturbance Rejectionmentioning

confidence: 96%

Section: Virtual Resistance Based Active Damping (Ad) Strategymentioning

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

View full text Add to dashboard Cite

show abstract

“…To increase the damping term in (1) without additional energy loss, an effective resistance emulation method, so-called active damping control, was introduced in [24,25,[28][29][30]. Figure 2a shows the resonance damping method utilizing capacitor current feedback.…”

Section: Active Damping Control With Capacitor Current Feedbackmentioning

confidence: 99%

Improved Direct Deadbeat Voltage Control with an Actively Damped Inductor-Capacitor Plant Model in an Islanded AC Microgrid

2016

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Abstract:A direct deadbeat voltage control design method for inverter-based microgrid applications is proposed in this paper. When the inductor-capacitor (LC) filter output voltage is directly controlled using voltage source inverters (VSIs), the plant dynamics exhibit second-order resonant characteristics with a load current disturbance. To effectively damp the resonance caused by the output LC filter, an active damping strategy that does not cause additional energy loss is utilized. The proposed direct deadbeat voltage control law is devised from a detailed, actively damped LC plant model. The proposed deadbeat control method enhances voltage control performance owing to its better disturbance rejection capability than the conventional deadbeat or proportional-integral-based control methods. The most important advantage of the proposed deadbeat control method is that it makes the deadbeat control more robust by bringing discrete closed-loop poles closer to the origin. Simulation and experimental results are shown to verify the enhanced voltage control performance and stability of the proposed voltage control method.

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“…The larger the value of o Z , the stronger the rejection of grid voltage disturbances [10] [26]. Hence, if the output impedance is high enough in the whole frequency range, the power quality will be much more improved in terms of harmonic distortion.…”

Section: B Rejection Of Grid Disturbancesmentioning

confidence: 99%

Co-design of the LCL Filter and Control for Grid-Connected Inverters

Zhang

Xue

Li³

et al. 2014

Journal of Power Electronics

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In most grid-connected inverters (GCI) with an LCL filter, since the design of both the LCL filter and the controller is done separately, considerable tuning efforts have to be exerted when compared to inverters using an L filter. Consequently, an integrated co-design of the filter and the controller for an LCL-type GCI is proposed in this paper. The control strategy includes only a PI current controller and a proportional grid voltage feed-forward controller. The capacitor is removed from the LCL filer and the design procedure starts from an L-type GCI with a PI current controller. After the PI controller has been settled, the capacitor is added back to the filter. Hence, it introduces a resonance frequency, which is identified based on the crossover frequencies to accommodate the preset PI controller. Using the proposed co-design method, harmonic standards are satisfied and other practical constraints are met. Furthermore, the grid voltage feed-forward control can bring an inherent damping characteristic. In such a way, the good control performance offered by the original L-type GCI and the sharp harmonic attenuation offered by the latter designed LCL filter can be well integrated. Moreover, only the grid current and grid voltage are sensed. Simulation and experimental results verify the feasibility of the proposed design methodology.

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Suppression of Line Voltage Related Distortion in Current Controlled Grid Connected Inverters

Cited by 159 publications

References 9 publications

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

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

Improved Direct Deadbeat Voltage Control with an Actively Damped Inductor-Capacitor Plant Model in an Islanded AC Microgrid

Co-design of the LCL Filter and Control for Grid-Connected Inverters

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