A Coordinate Control Strategy for Circulating Current Suppression in Multiparalleled Three-Phase Inverters

Zhang, Xueguang; Wang, Tian-Yi; Wang, Xiongfei; Wang, Gaolin; Chen, Zhe; Xu, Dianguo

doi:10.1109/tie.2016.2578280

Cited by 67 publications

(22 citation statements)

References 39 publications

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“…Tsung [18] proposed the feed-forward method, which allows each converter to use a common zero-sequence modulation signal. On the other hand, Zhang [19], [20] proposed a feed-forward zero-sequence modulation signal to expand the bandwidth of the 0-axis current loop. [21] proposes a PIquasi resonant controller to control circulating current and feed-forward controller to reduce the difference in duty cycles.…”

Section: Circulating Current Controlmentioning

confidence: 99%

The d and q Axes Technique for Suppression Zero-Sequence Circulating Current in Directly Parallel Three-Phase PWM Converters

Panprasert

Neammanee

2021

IEEE Access

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The directly parallel pulse width modulated converter (DPC) method is used to construct large-scale converter systems to increase system performance and reduce costs. However, circulating currents arise when the converters supply unbalanced currents or have different converter parameters. Circulating currents cause distortions in the current, increase the current coming from each converter, and degrade the system performance. This paper proposes a circulating current control (CCC) methodology to eliminate circulating currents through the analysis and approximation of the circulating current of the fundamental harmonic current at 150 Hz. By using the phase shift technique, this new model of the circulating current in the 0-axis was extended to the 0dand 0q-axes. The proposed CCC was then designed according to the new circulating current model and added to the conventional controller. The performance of the proposed CCC converter was verified via simulation and experimentally with three directly parallel 5.5 kVA converters. The proposed CCC enhanced controller and conventional controller were tested with various current values, and all resulting circulating currents were recorded. The experimental results showed that the proposed CCC eliminated nearly all the circulating currents and that it had a fast, dynamic response to step-change currents. Using ramp current sharing, the experimental results were confirmed. Additionally, the efficiency of the proposed CCC in the DPC was significantly higher than the conventional controller, and the system's efficiency was the same as that of a single converter connection. Thus, using the proposed CCC in DPC systems is economical, highly efficient, modular, and flexible. INDEX TERMSPWM converter, directly parallel PWM converters, circulating current control, current sharing, CCC NOMENCLATURE d ax , d bx , d cx modulation signal of phases a, b, c of converter x : x = 1, 2, …n d acx , d bcx , d ccx compensated modulation signal of phases a, b, c of converter x : x = 1, 2, …n d aSVMx , d bSVMx , d cSVMx space vector modulation (SVM) of phases a, b, c of converter x : x = 1, 2, …n d dx , d qx , modulation signal of the d-, q-axes d kx duty ratio for phase k of the x th converter d 0x zero-sequence modulation signal of the 0-axis of converter x com x d , com x d zero-sequence modulation compensation signal of the 0-, 0-axes

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Section: Circulating Current Controlmentioning

confidence: 99%

The d and q Axes Technique for Suppression Zero-Sequence Circulating Current in Directly Parallel Three-Phase PWM Converters

Panprasert

Neammanee

2021

IEEE Access

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“…The above-mentioned fault tolerance methods are not suitable to deal with this multiphase failure situation, but an effective solution is to deploy multiple redundant phase legs or multiple converters in parallel. However, this will undoubtably increase the overall cost [22], [23].…”

Section: Introductionmentioning

confidence: 99%

Fault Tolerant Control of Advanced Power Generation Center for More-Electric Aircraft Applications

Lang

Yang

Wang

et al. 2022

IEEE Trans. Transp. Electrific.

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This paper presents a control scheme for a recently reported aircraft advanced power generation center (APGC) during postfault operation conditions. Within the APGC, two electrical generators extract power from two separate engine shafts and supply electrical power to a common HVDC bus through their dedicated main AC/DC power converters. An extra back-to-back (BTB) converter is also used to connect the ac terminals of the two generators. This architecture provides merits of fault tolerance capabilities of the APGC. In the case of main AC/DC power converter failure, the system can be reconfigured and the BTB converter provides an extra power flow path from the generators to the HVDC bus. This ensures electrical power generation capabilities onboard. The paper discusses in detail the control of the APGC under fault conditions with one main AC/DC converter failure. A seamless transition scheme from normal operation to postfault conditions is proposed using a voltage command initialization technique within the BTB converter. Both experimental and simulation results have verified the fault tolerance improvement and control performances of the APGC.

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“…A feed-forward term is added to the zero-sequence PI controller, and then depending on the reference signals, duty cycles are generated. Another duty cycle correction based control strategy is proposed in [18]. In both the above methods, the mismatch among the line inductance values of a VSI is not considered.…”

Section: Introductionmentioning

confidence: 99%

Circulating Current Suppression in Parallel Interleaved 2L VSIs Using Modified CM Offset Based Method During Inductors Mismatch Condition

Shukla

Maheshwari

2021

IEEE Trans. on Ind. Applicat.

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A Coordinate Control Strategy for Circulating Current Suppression in Multiparalleled Three-Phase Inverters

Cited by 67 publications

References 39 publications

The d and q Axes Technique for Suppression Zero-Sequence Circulating Current in Directly Parallel Three-Phase PWM Converters

The d and q Axes Technique for Suppression Zero-Sequence Circulating Current in Directly Parallel Three-Phase PWM Converters

Fault Tolerant Control of Advanced Power Generation Center for More-Electric Aircraft Applications

Circulating Current Suppression in Parallel Interleaved 2L VSIs Using Modified CM Offset Based Method During Inductors Mismatch Condition

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