Accurate PWM Model of Multi-Updated L-filtered Voltage-Source Converters

Wang, Yangwen; Jin, Zheming; Wang, Xiongfei

doi:10.1109/ecce44975.2020.9236178

Cited by 2 publications

(5 citation statements)

References 15 publications

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“…13, from the output of the CCF loop, the system operated stably under the different grid inductance without resonance issues. Hence, the simulation results confirmed the robustness of PDBAM control and the effectiveness of the stable region derived in (23) and (35).…”

Section: ) Robustnesssupporting

confidence: 69%

“…The effectiveness and reliability of the PDBAM control method have been verified by simulation and experiment. The system parameters of the PCS are shown in Table I, where the LCL filter design is based on reasonable resonance frequency according to (23), tolerable voltage drop across the inductors, and tolerable power factor decrease caused by the capacitor.…”

Section: Simulation and Experiments Resultsmentioning

confidence: 99%

“…Generally, the methods to eliminate the impact of time delay can be classified into time-delay reduction methods and time-delay compensation methods [16], [22]. Timedelay reduction methods, such as sampling point shifting [21] and multi-updated PWM method [23], can reduce time delay to a degree, which is less than a control period. Time-delay compensation methods are mainly based on predictive control, including deadbeat control [24], [25] and linear predictor [26]; nevertheless, to ensure prediction accuracy, the predictive control is typically model-based and usually compensate for finite time delays that are integer multiples of the control period.…”

Section: Introductionmentioning

confidence: 99%

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Predictive Deadbeat Average Model Control for Power Conversion System With LCL Filter

Zhu,

Xiao,

Ouyang

et al. 2023

IEEE Access

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The inherent resonance issue of LCL filters in the power conversion system(PCS) will significantly degrade the system's stability. Researches indicate that decreasing the time delay contributes to the system's stability under converter-side current feedback(CCF) control. To improve the system's stability, this paper is devoted to alleviating the impact of time delay on the system's stability by the combination of time-delay compensation and time-delay reduction. Since the effectiveness of time-delay compensation provided by predictive control depends on the accuracy of the control model, a deadbeat average model (DBAM) for the CCF loop is established based on the use of the oversampling technique. The proposed control model, which ingeniously transforms conventional single-point sampling control into multi-point average control, improves the accuracy of the system description. Furthermore, through the introduction of predictive control combined with the double-updated PWM method, a predictive deadbeat average model (PDBAM) control method is proposed for the PCS. The proposed control method minimizes the impact of time delay on CCF loop, which enhances the system's stability and overcomes the resonance issue of LCL filter. Besides, the stable region of the PDBAM control is deduced. Simulation and experimental results demonstrate the effectiveness of the PDBAM control.INDEX TERMS LCL filter, power conversion system, predictive control, system stability.

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Section: ) Robustnesssupporting

confidence: 69%

Section: Simulation and Experiments Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Predictive Deadbeat Average Model Control for Power Conversion System With LCL Filter

Zhu,

Xiao,

Ouyang

et al. 2023

IEEE Access

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“…It not only slows down the regulation speed of the control loop, but also lead to coupling. There are two main methods to eliminate the time delay, one is model prediction control (MPC) [5–8], and the other is updating and sampling concepts improvement in the digital control [9, 10]. An open‐loop current controller based on MPC is proposed in [6], the sensitivity of the method to time delay is analysed and compensated.…”

Section: Introductionmentioning

confidence: 99%

“…The conclusion is that the double updated pulse width modulation (PWM) method has a smaller time delay. In [10], a multi‐updated PWM‐based digital controller is given to reduce the negative impact of time delay on the inverter system. However, the improvement of updating method would introduce additional noise and the corresponding compensations are still needed [11, 12].…”

Section: Introductionmentioning

confidence: 99%

Complete decoupling compensation of three‐phase inverter with LCL filter in synchronous reference frame

Shi

Huang

Zheng

2022

IET Power Electronics

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A decoupling control strategy of three‐phase inverter, which can realize complete decoupling of the active and reactive current in the synchronous reference frame (SRF) is proposed here. There are two coupling factors of current loop in SRF, one is time delay caused by digital control, and the other is AC filter. Dynamic time delay compensation is applied to eliminate coupling caused by the first factor. The phase of the bridge leg voltage can be predicted. The difference between it and the phase of reference voltage which takes part in pulse width modulation (PWM) is the dynamic compensation angle, which can compensate the time delay. High‐order feedforward compensation is applied to eliminate coupling caused by the second factor. Complex vector model of the LCL filter is derived and the high‐order coupling coefficients can be offset by feedforward compensation. The coupling characteristics and compensation principles are analysed in detail. The system stability is discussed. Finally, the simulation and experimental results are given to verify the theoretical analysis.

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Accurate PWM Model of Multi-Updated L-filtered Voltage-Source Converters

Cited by 2 publications

References 15 publications

Predictive Deadbeat Average Model Control for Power Conversion System With LCL Filter

Predictive Deadbeat Average Model Control for Power Conversion System With LCL Filter

Complete decoupling compensation of three‐phase inverter with LCL filter in synchronous reference frame

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