Improved Passivity of Grid-Connected Impedance using Asymmetric Dual-Edge Modulators

Abedini, Hossein; Bonanno, Giovanni; Cvetanovic, Ruzica; Comacchio, Andrea; Biadene, Davide; Mattavelli, Paolo

doi:10.1109/pedg54999.2022.9923105

Cited by 3 publications

(4 citation statements)

References 29 publications

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“…When T d is reduced to 0.5T s , a passive Y c1 within the Nyquist frequency can be obtained. However, achieving delay reduction for one sampling period is costly and complex [20], [21].…”

Section: Admittance Shaping For Passivity Enhancement a Passivity Ana...mentioning

confidence: 99%

“…The first is to insert a phase compensator, such as discrete derivative controller [18] and biquad filter [19], into the current regulator in parallel to extend the passive region, but the nonpassive region still exists at high frequencies. The second is to use the improved pulsewidth modulation (PWM) method, such as multisampled PWM [20] and asymmetric dual edge carrier-based PWM [21], to reduce the control delay, which can eliminate the nonpassive region but increase the implementation cost and complexity. The third is to use active damping to provide an additional positive-real-part admittance, such as CVF or point of common coupling (PCC) voltage feedforward, thus compensating for the negative real part of the output admittance.…”

Section: Introductionmentioning

confidence: 99%

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Passivity Enhancement and Grid-Current Distortion Mitigation for Inverter-Side Current Controlled LCL-Type Grid-Connected Inverters

Liu,

Xu,

et al. 2024

IEEE Access

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Inverter-side current (ISC) control has been widely used in LCL-type grid-connected inverters due to its cost-effectiveness. However, the ISC-controlled inverters suffer from instability and injected grid current distortion under weak grid conditions, such as grid impedance variations and background harmonics. To solve these problems, this article presents an admittance shaping scheme based on capacitor voltage feedforward (CVF) for ISC-controlled LCL-type grid-connected inverters. A delay compensated proportional CVF method is used to shape the inverter output admittance to be passive almost up to the Nyquist frequency. Then, another high-pass filter-based CVF method is employed to shape the grid harmonic admittance to greatly reduce the admittance magnitude at the harmonic frequencies. Thanks to the proposed admittance shaping scheme, the ISC-controlled inverter system can operate stably regardless of the grid impedance and has excellent grid-current harmonic suppression capability. The effectiveness of the proposed admittance shaping scheme is verified by detailed simulation and experimental results.INDEX TERMS Grid-connected inverter, capacitor voltage feedforward, harmonic suppression, passivity.

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“…When T d is reduced to 0.5T s , a passive Y c1 within the Nyquist frequency can be obtained. However, achieving delay reduction for one sampling period is costly and complex [20], [21].…”

Section: Admittance Shaping For Passivity Enhancement a Passivity Ana...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Passivity Enhancement and Grid-Current Distortion Mitigation for Inverter-Side Current Controlled LCL-Type Grid-Connected Inverters

Liu,

Xu,

et al. 2024

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Thus, it is worth investigating alternative approaches for the delay reduction. The novel delay reductionbased method to improve the passivity properties of digitally controlled PEC is proposed in [27]. Instead of using stateof-the-art trailing-triangle edge (TTE) carrier-based DPWM [28], the recently proposed asymmetric dual-edge DPWM (ADE-DPWM) is considered [29], [30].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to delays, destabilization of poorly damped grid resonances at high frequencies may also be influenced by sampling and PWM sidebands [5], [13], [14], [21]. Extending the analysis in [27], this paper examines the passivity properties of PECs with ADE-DPWM above half of the switching frequency. To predict system performance at these frequencies, a multiple-frequency model that takes into account sidebands is essential [31].…”

Section: Introductionmentioning

confidence: 99%

High Frequency Passivity Properties of Grid-Connected Admittance With Double-Sampling Asymmetric Dual-Edge Modulator

Cvetanovic

Bonanno

Comacchio

et al. 2022

IEEE Open J. Power Electron.

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Small-signal stability and dynamic interactions among power electronic converters (PECs) and electrical grids are widely analyzed using the impedance-based approach. To reduce such interactions, a desirable feature of PECs is that their admittance exhibits dissipative behavior. Due to control delays, the PEC admittance usually exhibits non-dissipative zones around and above the crossover frequency of the inner control loop, possibly reducing the stability margins of the contemporary electrical grids. This paper proposes the double-sampling asymmetric dual-edge digital pulse-width modulator (ADE-DPWM) as an effective way to improve the passivity properties of the PEC admittance. Even in the digital implementation, the ADE-DPWM features zero delay and almost unity magnitude up to half of the switching frequency. Moreover, this paper examines the influence of ADE-DPWM on the PEC admittance even at higher frequencies, where destabilization of poorly damped grid resonances may be influenced by sampling and pulse-width modulation sidebands. Due to an operating point dependent ADE-DPWM small-signal model, the high-frequency passivity properties highly depend on the steady-state operating point. The analytical predictions are shown to be in excellent agreement with the experimental admittance measurements up to twice the switching frequency for all tested steady-state operating points.INDEX TERMS Admittance, asymmetric dual-edge digital pulse-width modulator (ADE-DPWM), passivity properties, power-electronic converters (PECs), sidebands.

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Controller parameter optimization of LCL-type grid-connected inverters for passivity margin enhancement

Liu,

Xu,

et al. 2024

International Journal of Electrical Power & Energy Systems

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Improved Passivity of Grid-Connected Impedance using Asymmetric Dual-Edge Modulators

Cited by 3 publications

References 29 publications

Passivity Enhancement and Grid-Current Distortion Mitigation for Inverter-Side Current Controlled LCL-Type Grid-Connected Inverters

Passivity Enhancement and Grid-Current Distortion Mitigation for Inverter-Side Current Controlled LCL-Type Grid-Connected Inverters

High Frequency Passivity Properties of Grid-Connected Admittance With Double-Sampling Asymmetric Dual-Edge Modulator

Controller parameter optimization of LCL-type grid-connected inverters for passivity margin enhancement

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