Circulating current derivation and comprehensive compensation of cascaded STATCOM under asymmetrical voltage conditions

He, Zhixing; Ma, Fujun; Luo, An; Xu, Qianming; Chen, Yandong; Xiao, Huagen; Jin, Guobin

doi:10.1049/iet-gtd.2015.1374

Cited by 14 publications

(4 citation statements)

References 36 publications

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“…The reason why countries around the world have had to start developing plans to optimize their energy mix is the accelerated consumption of fossil energy leading to further environmental problems and China's solemn commitment to "carbon neutrality" and "peak emissions" [1,2]. The microgrid is a useful supplement to the traditional grid, which not only allows green renewable energy to be fully utilized for power generation, but also overcomes the multiple disadvantages of long-distance transmission and fault chain reactions of the "centralized" grid [3][4][5]. Various forms of distributed energy, loads and energy storage devices are optimally integrated by the microgrid to form a controllable unit with a wider range of applications, higher carrying capacity and more flexible operation [6].…”

Section: Introductionmentioning

confidence: 99%

Virtual composite impedance circulating current suppression strategy with adaptive adjustment capability

Zhang

Liu

Wei

et al. 2022

IET Generation Trans & Dist

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In the process of accessing distributed power sources in microgrid, there will be serious coupling between active power and reactive power, which will lead to significant changes in the inverter outlet voltage and impedance and increase the circulating current phenomenon. The generation of circulating current will accelerate the aging of devices, reduce the inverter efficiency, and threaten the stable operation of the system. In this paper, the mechanism of circulating current generation is analysed, the basic characteristics of circulating current are studied, and an inverter parallel circulating current suppression strategy with adaptive virtual composite impedance and droop control dynamic adjustment algorithm is proposed. The virtual impedance setting can weaken the influence of line difference on system stability, make the system equivalent output impedance resistive, weaken the inductive device characteristics and reduce the circulating current amplitude; the adaptive droop algorithm implantation dynamically correlates the control power with the droop coefficient, enhance the power decoupling accuracy and weaken the circulating current influenced by power changes. The simulation platform and experimental setup established by the large‐scale simulation software PSCAD/EMTDC are used to study the basic scenarios of the inverter under two conditions of equal and unequal capacity, and the rationality of the proposed control strategy is tested.

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Section: Introductionmentioning

confidence: 99%

Virtual composite impedance circulating current suppression strategy with adaptive adjustment capability

Zhang

Liu

Wei

et al. 2022

IET Generation Trans & Dist

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“…Modular multilevel cascaded converter (MMCC) based STATCOMs are more effective for high voltage and power applications compared to the two-level and multilevel converters because of their benefits of scalability, modular nature, reduced switching losses and reduced filtering requirement [6][7][8][9][10]. Even with the above-mentioned benefits of the MMCC-STATCOM, when applied under asymmetric voltage or unbalanced load conditions, power imbalance is experienced across each phase of the MMCC.…”

Section: Introductionmentioning

confidence: 99%

Reactive Power Compensation of Modular Multilevel Cascaded Converter STATCOM using Average Power Inter-Cluster Control Method under Unbalanced Voltage Conditions

2021

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This presents a reactive power control strategy for the single delta bridge cell modular multilevel cascaded converter (SDBC-MMCC) for static synchronous compensator (STATCOM) under asymmetric voltage conditions. An average power balancing method is proposed to support continuous injection of reactive power under grid voltage fault conditions, considering sub-module capacitor voltage balancing and STATCOM maximum phase current protection. Analytical solutions of the STATCOM phase currents are presented. A maximum current limit control scheme is proposed to ensure continuous reactive power injection and STATCOM operation under unbalanced voltage condition. The fault-ride through capability of the SDBC STATCOM under asymmetrical condition is analyzed using the proposed method. A comparative analysis shows that the current requirement of the proposed strategy is superior to the zero-sequence current balancing technique.

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“…The static var generator (SVG) is an effective solution to supply reactive power for power systems to control the power factor and regulate the grid voltage. The SVG based on a cascaded multi-level structure is one of the most effective power quality solutions in high-voltage and high-capacity applications, due to its advantages of modular structure, fast reactive power adjustment, transformer-less, and desirable output performance [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Power Control and Fault Ride-Through Capability Analysis of Cascaded Star-Connected SVG under Asymmetrical Voltage Conditions

Xiao

Wang

et al. 2019

Energies

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The cascaded H-bridge static var generator (SVG) has been employed to provide reactive power and regulate grid voltages for many years because of its good modularity, easy scalability, and improved harmonic performance. A novel cluster-balancing power control method combining negative-sequence currents and zero-sequence voltage is proposed to redistribute the unbalanced active powers and eliminate the power oscillation under asymmetrical conditions. Simultaneously, the dynamic performance of the SVG power balance control can be improved under asymmetrical conditions with the zero-sequence voltage expression derived in this paper. On the basis of the proposed method, the fault ride through capability of star-connected SVG under asymmetrical conditions is compared among active power oscillation elimination (APOE), reactive power oscillation elimination (RPOE), and balanced positive sequence current (BPSC) injection references calculation strategies from the perspective of the zero-sequence voltage, maximum phase voltage, and maximum phase current. The method provides the theoretical reference for power control under asymmetric conditions and the analysis results show that under asymmetrical conditions, the current of BPSC is minimal and symmetrical, while the RPOE has the least voltage and no zero- sequence voltage needs to be injected. Finally, the results of simulation and experiment have been given to verify the theoretical studies.

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Circulating current derivation and comprehensive compensation of cascaded STATCOM under asymmetrical voltage conditions

Cited by 14 publications

References 36 publications

Virtual composite impedance circulating current suppression strategy with adaptive adjustment capability

Virtual composite impedance circulating current suppression strategy with adaptive adjustment capability

Reactive Power Compensation of Modular Multilevel Cascaded Converter STATCOM using Average Power Inter-Cluster Control Method under Unbalanced Voltage Conditions

Power Control and Fault Ride-Through Capability Analysis of Cascaded Star-Connected SVG under Asymmetrical Voltage Conditions

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