EPE Association: EPE 2017 - LS2b: Control Techniques for Power Converters II (Grid Connected Converters)

EPE 2017 - LS2b: Control Techniques for Power Converters II (Grid Connected Converters)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 03: Measurement and Control > EPE 2017 - LS2b: Control Techniques for Power Converters II (Grid Connected Converters)

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   A Comparison of Virtual Circuit-Based Control Designs for Half-Bridge Converters with LCL Output Filters
By Korawich NIYOMSATIAN [View]
[Download]

Abstract: This paper compares the design and performance of two controls for half-bridge converters with LCLoutput filters based on Virtual Circuit Design method, which is an intuitive way to achieve desiredclosed-loop behaviours as well as resonance damping and low-frequency behaviours. The first controlis represented by a circuit employing a resistor in series with a converter-side inductor to stabilize theresonance while the second one by a resistor in parallel with a filter capacitor. This yields differentlow-frequency behaviours and different designs of the current controllers. Moreover, both circuits featurethe adjustable virtual inductance to improve the bandwidth and the robustness. The experiment illustratesexcellent performances from the step response and fair robustness against grid-inductance variation.

   Limits, Stability and Disturbance Rejection Analysis of Voltage Control Loop Strategies for Grid Forming Converters in DC and AC Microgrids with High Penetratio
By ANGEL NAVARRO-RODRIGUEZ [View]
[Download]

Abstract: This paper extensively analyzes the operation limits, system stability and disturbance rejection capability of the voltage control loops used in master-slave AC and DC Microgrids (MGs). Two different control schemes are studied analytically, simulated and experimentally tested, focusing on Constant Power Loads (CPL). Additionally, the use of the virtual capacitance (VC) as a tool for response enhancement is introduced. The study pursues the proper selection of the controllers gains and minimization of capacitance values by considering the dynamic behavior.

   Self-Adaptive Resonance Frequency Tracking for Digital Notch-Filter-Based Active Damping in LCL-Filter-Based Active Power Filters
By Swen BOSCH [View]
[Download]

Abstract: In this paper, a self-adaptive resonance frequency tracking method is presented. The resonance frequency tracking is used in a LCL-filter-based active power filter to adapt the frequency of the notch filter applied for active resonance damping. By determining the resonance frequency of the LCL-filter and adapting the notch filter frequency, the bandwidth of the notch filter can be decreased, whereby the dynamic performance of the current control loop is increased. The notch filter frequency is adapted to the resonance frequency by a PI controller using the frequency depending difference in the attenuation of two band-pass filters which are kept equidistant below and above the notch filter frequency. At this, the symmetrical attenuation of both band-pass filters in the frequency range between them is used.

   Voltage harmonics suppression add-on functionality without additional sensors for existing grid-connected inverters
By Ya ZHANG [View]
[Download]

Abstract: A strategy for voltage harmonics suppression is proposed to upgrade existing grid-connected inverters.It utilizes the already available measurement of the voltage at the point of common connection and theinverter output current. As a result, on top of conventional power injection, the inverter is equipped withan additional feature for harmonics compensation. Model analysis, simulation and experiments verifythe effectiveness of the proposed strategy.

EPE 2017 - LS2b: Control Techniques for Power Converters II (Grid Connected Converters)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 03: Measurement and Control > EPE 2017 - LS2b: Control Techniques for Power Converters II (Grid Connected Converters)
	[return to parent folder]

	A Comparison of Virtual Circuit-Based Control Designs for Half-Bridge Converters with LCL Output Filters By Korawich NIYOMSATIAN	[View] [Download]
Abstract: This paper compares the design and performance of two controls for half-bridge converters with LCLoutput filters based on Virtual Circuit Design method, which is an intuitive way to achieve desiredclosed-loop behaviours as well as resonance damping and low-frequency behaviours. The first controlis represented by a circuit employing a resistor in series with a converter-side inductor to stabilize theresonance while the second one by a resistor in parallel with a filter capacitor. This yields differentlow-frequency behaviours and different designs of the current controllers. Moreover, both circuits featurethe adjustable virtual inductance to improve the bandwidth and the robustness. The experiment illustratesexcellent performances from the step response and fair robustness against grid-inductance variation.

	Limits, Stability and Disturbance Rejection Analysis of Voltage Control Loop Strategies for Grid Forming Converters in DC and AC Microgrids with High Penetratio By ANGEL NAVARRO-RODRIGUEZ	[View] [Download]
Abstract: This paper extensively analyzes the operation limits, system stability and disturbance rejection capability of the voltage control loops used in master-slave AC and DC Microgrids (MGs). Two different control schemes are studied analytically, simulated and experimentally tested, focusing on Constant Power Loads (CPL). Additionally, the use of the virtual capacitance (VC) as a tool for response enhancement is introduced. The study pursues the proper selection of the controllers gains and minimization of capacitance values by considering the dynamic behavior.

	Self-Adaptive Resonance Frequency Tracking for Digital Notch-Filter-Based Active Damping in LCL-Filter-Based Active Power Filters By Swen BOSCH	[View] [Download]
Abstract: In this paper, a self-adaptive resonance frequency tracking method is presented. The resonance frequency tracking is used in a LCL-filter-based active power filter to adapt the frequency of the notch filter applied for active resonance damping. By determining the resonance frequency of the LCL-filter and adapting the notch filter frequency, the bandwidth of the notch filter can be decreased, whereby the dynamic performance of the current control loop is increased. The notch filter frequency is adapted to the resonance frequency by a PI controller using the frequency depending difference in the attenuation of two band-pass filters which are kept equidistant below and above the notch filter frequency. At this, the symmetrical attenuation of both band-pass filters in the frequency range between them is used.

	Voltage harmonics suppression add-on functionality without additional sensors for existing grid-connected inverters By Ya ZHANG	[View] [Download]
Abstract: A strategy for voltage harmonics suppression is proposed to upgrade existing grid-connected inverters.It utilizes the already available measurement of the voltage at the point of common connection and theinverter output current. As a result, on top of conventional power injection, the inverter is equipped withan additional feature for harmonics compensation. Model analysis, simulation and experiments verifythe effectiveness of the proposed strategy.