EPE Association: EPE 2025 - DS3d: Modulation and Control Methods

EPE 2025 - DS3d: Modulation and Control Methods
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2025 - Conference > EPE 2025 - Topic 11: Measurement, Supervision and Control for Power Converters > EPE 2025 - DS3d: Modulation and Control Methods

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   A bounded controller for a class of bidirectional boost DC/DC converters: Application to storage devices
By Frederic MAZENC, Alessio IOVINE [View]
[Download]

Abstract: This paper lies in the research field of advanced control for power converters. We propose a bounded controller for a DC/DC boost converter, which ensures boundedness and stability of the closed loop systems. Guidelines on how to select the controller's parameters are provided. Simulations confirm that the developed control strategy effectively regulates the converter.

   Active Damping Strategies for Mitigating Resonances in Offshore Wind Farms: A Comparative Study of PWM and SHEPWM
By Iñigo PASCUAL, Naroa RAMOS, Eugenio GUBÍA, Jesús LÓPEZ, Javier SAMANES [View]
[Download]

Abstract: This paper presents an active damping strategy to mitigate resonances in offshore wind farms caused by the parasitic capacitance of submarine cables, which challenge system stability and grid code compliance. The proposed method emulates a virtual impedance damping the wide range of resonances that appear in offshore wind farms, depending on its configuration and number of turbines connected. Its effectiveness is evaluated for two modulation techniques: PWM and selective harmonic elimination PWM. PWM generates predictable harmonic content outside the resonance range, enabling robust damping of resonances. In contrast, selective harmonic elimination PWM---though optimized to eliminate the harmonics in the resonance frequency range---introduces distortion in this range due to modulation-control interactions in closed-loop operation. This distortion demands excessive corrective action from the AD, limiting its practicality. The strategy and its results are validated through simulation.

   Backstepping Controller Design with Inherent Current Limitation for a Voltage-Controlled Grid-Side Converter
By Lasse GNÄRIG, Robin WEISS, Steffen BERNET [View]
[Download]

Abstract: The control and optimization of grid-forming converters remain crucial in power electronics research. A key challenge is limiting the converter's output current during severe grid disturbances to protect equipment. Existing current-limiting strategies either indirectly modify the output voltage or directly control the current, the latter requiring an additional control loop that increases complexity and may introduce instability. To address these challenges, this paper proposes a backstepping-based control strategy that ensures asymptotic stability while maintaining current limitation. A novel selection of control Lyapunov functions enables a continuous control law, ensuring seamless operation across normal and fault conditions without switching between control modes. This feature is particularly beneficial for stability analysis of power electronic-based grids under fault conditions, as it allows for a more straightforward and unified stability assessment. The proposed method is implemented on a two-level voltage source converter (2L-VSC) with an LCL filter. Preliminary simulations validate its effectiveness in ensuring stable operation under both nominal and fault conditions.

   Carrier Synchronization Method using High-Speed Sampling for Parallel Inverters without Communication
By Takumi IWAMOTO, Hiroki WATANABE, Yuki NAKATA, Itoh JUN-ICHI [View]
[Download]

Abstract: This paper proposes a novel carriersynchronized control method for the parallel operation of two inverters using high-speed sampling. The proposed method focuses on the active power component at the switching frequency. When carrier synchronization is achieved, the active power at the switching frequency becomes zero for inverters connected in parallel. The proposed method calculates the active power at the switching frequency using high-speed sampling, switching states, and the fast Fourier transform (FFT). The proposed method requires only DC voltage and inductor current measurement without additional sensors. Furthermore, the proposed method is implemented in a single-phase inverter and does not need communication between units. Experimental results demonstrate that the circulating current is successfully suppressed to less than 66\% of the rated current, thereby, validating the efficacy of the proposed control method.

   Novel Control Methodologies of Back-to-Back B6 Bridges for an Application-Related Stress Test Setup
By Andreas WARMUTH, Kevin KAPAJ, Alexander ULBING [View]
[Download]

Abstract: Back-to-back (B2B) B6 bridges stand out as the go-to solution for power cycling and application related stress tests in the reliability sector of power electronics. This paper delves into novel control strategies for the electro-thermal stress reconstruction of Device-under-Tests (DUTs), with a specific focus on signal shape reconstruction and current ripple reduction. A novel precalculation method is introduced, enabling the prediction of an operating point for open-loop control, thus facilitating the reconstruction of complex signal shapes. The presented concepts are rigorously evaluated through hardware testing and real measurement results, underlining their practical viability in real-world applications.

   Numerically Stable Implementation of Active Power Decoupling Control Strategies
By Esther NTOW, Harminderjit Singh TOOR, Lakshmi Varaha IYER, Narayan C. KAR, Caniggia VIANA [View]
[Download]

Abstract: In active power decoupling (APD), image ambiguity in functions like 'sqrt' and 'atan2' can destabilize capacitor voltage control, leading to glitches. This paper proposes a phase unwrapping technique (PUT)that stabilizes angle computation, eliminating glitches from atan2-induced image ambiguity. Simulations results recreate and eliminate atan2-induced glitches using the proposed PUT.

   Passivity Analysis in Power Electronic Converters with SHE Modulation
By Naroa RAMOS, Iñigo PASCUAL, Eugenio GUBÍA, Jesús LÓPEZ, Javier SAMANES [View]
[Download]

Abstract: To ensure the stability of modern powergrids, particularly those dominated by power electronics,it is convenient for grid-connected converters to exhibitpassivity across the entire frequency spectrum. Furthermore,it is interesting not only for the system to be passive,that is, for the converter system's resistance to be positive,but also for this resistance to have a high value, as it helpsdampen potential grid resonances. This article presents astudy of a grid-connected converter, achieving passivityand increasing the converter's resistance through controlstrategies. Given the growing use of Selective HarmonicElimination (SHE) modulation techniques in high-powerconverters, the analysis will also focus on how to assessthe passivity of a system employing these modulationtechniques.

   Small-Signal Analysis of Grid-Forming Vector Current Control
By Ognjen STANOJEV, Orcun KARACA, Mario SCHWEIZER [View]
[Download]

Abstract: Grid-Forming Vector Current Control is a novel control strategy that enhances PLL-based vector current control to enable the grid-forming functionalities. This paper develops a differential-algebraic equation model of grid-forming vector current control in dq-domain and numerically linearizes it to perform small-signal analysis and uncover additional properties and tuning guidelines.

EPE 2025 - DS3d: Modulation and Control Methods
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2025 - Conference > EPE 2025 - Topic 11: Measurement, Supervision and Control for Power Converters > EPE 2025 - DS3d: Modulation and Control Methods
	[return to parent folder]

	A bounded controller for a class of bidirectional boost DC/DC converters: Application to storage devices By Frederic MAZENC, Alessio IOVINE	[View] [Download]
Abstract: This paper lies in the research field of advanced control for power converters. We propose a bounded controller for a DC/DC boost converter, which ensures boundedness and stability of the closed loop systems. Guidelines on how to select the controller's parameters are provided. Simulations confirm that the developed control strategy effectively regulates the converter.

	Active Damping Strategies for Mitigating Resonances in Offshore Wind Farms: A Comparative Study of PWM and SHEPWM By Iñigo PASCUAL, Naroa RAMOS, Eugenio GUBÍA, Jesús LÓPEZ, Javier SAMANES	[View] [Download]
Abstract: This paper presents an active damping strategy to mitigate resonances in offshore wind farms caused by the parasitic capacitance of submarine cables, which challenge system stability and grid code compliance. The proposed method emulates a virtual impedance damping the wide range of resonances that appear in offshore wind farms, depending on its configuration and number of turbines connected. Its effectiveness is evaluated for two modulation techniques: PWM and selective harmonic elimination PWM. PWM generates predictable harmonic content outside the resonance range, enabling robust damping of resonances. In contrast, selective harmonic elimination PWM---though optimized to eliminate the harmonics in the resonance frequency range---introduces distortion in this range due to modulation-control interactions in closed-loop operation. This distortion demands excessive corrective action from the AD, limiting its practicality. The strategy and its results are validated through simulation.

	Backstepping Controller Design with Inherent Current Limitation for a Voltage-Controlled Grid-Side Converter By Lasse GNÄRIG, Robin WEISS, Steffen BERNET	[View] [Download]
Abstract: The control and optimization of grid-forming converters remain crucial in power electronics research. A key challenge is limiting the converter's output current during severe grid disturbances to protect equipment. Existing current-limiting strategies either indirectly modify the output voltage or directly control the current, the latter requiring an additional control loop that increases complexity and may introduce instability. To address these challenges, this paper proposes a backstepping-based control strategy that ensures asymptotic stability while maintaining current limitation. A novel selection of control Lyapunov functions enables a continuous control law, ensuring seamless operation across normal and fault conditions without switching between control modes. This feature is particularly beneficial for stability analysis of power electronic-based grids under fault conditions, as it allows for a more straightforward and unified stability assessment. The proposed method is implemented on a two-level voltage source converter (2L-VSC) with an LCL filter. Preliminary simulations validate its effectiveness in ensuring stable operation under both nominal and fault conditions.

	Carrier Synchronization Method using High-Speed Sampling for Parallel Inverters without Communication By Takumi IWAMOTO, Hiroki WATANABE, Yuki NAKATA, Itoh JUN-ICHI	[View] [Download]
Abstract: This paper proposes a novel carriersynchronized control method for the parallel operation of two inverters using high-speed sampling. The proposed method focuses on the active power component at the switching frequency. When carrier synchronization is achieved, the active power at the switching frequency becomes zero for inverters connected in parallel. The proposed method calculates the active power at the switching frequency using high-speed sampling, switching states, and the fast Fourier transform (FFT). The proposed method requires only DC voltage and inductor current measurement without additional sensors. Furthermore, the proposed method is implemented in a single-phase inverter and does not need communication between units. Experimental results demonstrate that the circulating current is successfully suppressed to less than 66\% of the rated current, thereby, validating the efficacy of the proposed control method.

	Novel Control Methodologies of Back-to-Back B6 Bridges for an Application-Related Stress Test Setup By Andreas WARMUTH, Kevin KAPAJ, Alexander ULBING	[View] [Download]
Abstract: Back-to-back (B2B) B6 bridges stand out as the go-to solution for power cycling and application related stress tests in the reliability sector of power electronics. This paper delves into novel control strategies for the electro-thermal stress reconstruction of Device-under-Tests (DUTs), with a specific focus on signal shape reconstruction and current ripple reduction. A novel precalculation method is introduced, enabling the prediction of an operating point for open-loop control, thus facilitating the reconstruction of complex signal shapes. The presented concepts are rigorously evaluated through hardware testing and real measurement results, underlining their practical viability in real-world applications.

	Numerically Stable Implementation of Active Power Decoupling Control Strategies By Esther NTOW, Harminderjit Singh TOOR, Lakshmi Varaha IYER, Narayan C. KAR, Caniggia VIANA	[View] [Download]
Abstract: In active power decoupling (APD), image ambiguity in functions like 'sqrt' and 'atan2' can destabilize capacitor voltage control, leading to glitches. This paper proposes a phase unwrapping technique (PUT)that stabilizes angle computation, eliminating glitches from atan2-induced image ambiguity. Simulations results recreate and eliminate atan2-induced glitches using the proposed PUT.

	Passivity Analysis in Power Electronic Converters with SHE Modulation By Naroa RAMOS, Iñigo PASCUAL, Eugenio GUBÍA, Jesús LÓPEZ, Javier SAMANES	[View] [Download]
Abstract: To ensure the stability of modern powergrids, particularly those dominated by power electronics,it is convenient for grid-connected converters to exhibitpassivity across the entire frequency spectrum. Furthermore,it is interesting not only for the system to be passive,that is, for the converter system's resistance to be positive,but also for this resistance to have a high value, as it helpsdampen potential grid resonances. This article presents astudy of a grid-connected converter, achieving passivityand increasing the converter's resistance through controlstrategies. Given the growing use of Selective HarmonicElimination (SHE) modulation techniques in high-powerconverters, the analysis will also focus on how to assessthe passivity of a system employing these modulationtechniques.

	Small-Signal Analysis of Grid-Forming Vector Current Control By Ognjen STANOJEV, Orcun KARACA, Mario SCHWEIZER	[View] [Download]
Abstract: Grid-Forming Vector Current Control is a novel control strategy that enhances PLL-based vector current control to enable the grid-forming functionalities. This paper develops a differential-algebraic equation model of grid-forming vector current control in dq-domain and numerically linearizes it to perform small-signal analysis and uncover additional properties and tuning guidelines.