Arm Phase-Shift Conducting Modulation for Alternate Arm Multilevel Converter With Half-Bridge Submodules

Yang, Heya; Fan, Shiyuan; Dong, Yufei; Yang, Huan; Li, Wuhua; He, Xiangning

doi:10.1109/tpel.2020.3030865

Cited by 27 publications

(5 citation statements)

References 25 publications

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“…According to the operation principle of the FBSM, two switching devices (two IGBTs, two diodes, or one IGBT and one diode) are always activated to carry the grid current irrespective of whether the FBSM is positively inserted, negatively inserted, or bypassed, and regardless of the direction of grid current [17], [23]. Thus, the conduction power loss of the cascaded FBSMs per phase under the two CVB methods can be calculated by…”

Section: Power Loss Estimationmentioning

confidence: 99%

“…Although the methods presented in [21] and [22] can be easily applied to HMC, they still have these unavoidable drawbacks and inherent limitations. To enhance the operating capability of AAC under a lower modulation index, CVB methods based on regulating the switching pattern of DSs were proposed in [17], [23], and [24]. Furthermore, a zero-sequence voltage injection scheme was introduced to address the imbalance issue between the upper and lower bridge arms [17].…”

Section: Introductionmentioning

confidence: 99%

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Capacitor Voltage Balancing Method for the Hybrid Multilevel Converter Considering Grid Voltage Sags

Zhang,

Wang,

et al. 2024

IEEE Trans. Power Electron.

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Compared to the traditional modular multilevel converter (MMC) and alternative arm converter (AAC), the hybrid multilevel converter (HMC) exhibits superiority in terms of cost and volume. In the HMC, the pulse width of the direction switch (DS) is conventionally utilized to maintain capacitor voltage balancing (CVB). However, this method has certain limitations, including a restricted range of modulation indices and the inability to support pure reactive power operation. To address these drawbacks, a new CVB method based on the phase angle of the DS is proposed in this paper. Compared to the traditional method, the proposed method enables the HMC to achieve a full range of modulation index and four-quadrant operation. Additionally, it demonstrates improved performance in terms of SM capacitance and capacitor voltage ripple, especially under severe grid voltage sags and low power factors. A comparative analysis is conducted between two CVB methods, focusing on the SM number, switch number, and SM capacitance. Furthermore, a unified control strategy considering asymmetrical and symmetrical grid voltage sags is proposed for these two CVB methods. Finally, the effectiveness and superiority of the proposed CVB methods are verified by simulation and experimental testing.

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Section: Power Loss Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Capacitor Voltage Balancing Method for the Hybrid Multilevel Converter Considering Grid Voltage Sags

Zhang,

Wang,

et al. 2024

IEEE Trans. Power Electron.

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“…The cell of the HBSM has a lower power loss compared to other topologies. However, it has a clear shortcoming against DC faults [57]. Single-clamped submodule (SCSM): This type of circuit was introduced to control the DC fault current problem without a significant increase in power loss and cost, as this kind is typically used in hybrid MMC topologies.…”

Section: Unipolar Smsmentioning

confidence: 99%

“…The cell of the HBSM has a lower power loss compared to other topologies. However, it has a clear shortcoming against DC faults [57].…”

mentioning

confidence: 99%

A Review on Modular Converter Topologies Based on WBG Semiconductor Devices in Wind Energy Conversion Systems

Athwer,

Darwish

2023

Energies

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This paper presents a comprehensive review on the employment of wide bandgap (WBG) semiconductor power devices in wind energy conversion systems (WECSs). Silicon-carbide- (SiC) and gallium-nitride (GaN)-based power devices are highlighted and studied in this review, focusing on their application in the wind energy system. This is due to their premium characteristics such as the operation at high switching frequency, which can reduce the switching losses, and the capability to operate at high temperatures compared with silicon (Si)-based devices. These advantages promote the replacement of the conventional Si-based devices with the WBG semiconductor devices in the new modular converter topologies due to the persistent demand for a more-efficient power converter topology with lower losses and smaller sizes. The main objective of this paper was to provide a comprehensive overview of the WBG power devices commercially available on the market and employed in the modular converter topologies for renewable energy systems. The paper also provides a comparison between the WBG power technologies and the traditional ones based on the Si devices. The paper starts from the conventional modular power converter topology circuits, and then, it discusses the opportunities for integrating the SiC and WBG devices in the modular power converters to improve and enhance the system’s performance.

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“…The interoperability of MMC and AAC in Hybrid HVDC Systems are explored in [16]. In [17], the phase-shift modulation is extended to the control frame of AAC systems so that the AAC system can be constructed in a cost-efficient way by substituting all full-bridge submodules with half-bridge submodules. However, the stability assessment of AAC systems has not been reported in current literature.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Overlap Period on the Stability of Current-Controlled Alternate Arm Converter Based on dq Frame Impedance Analysis

Jiang¹,

Arraño-Vargas²,

Shen³

et al. 2022

Electronics

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As a variant modular converter configuration, the alternate arm converter (AAC) is well-suited for high-voltage power transmission and large-scale integration of renewables. In contrast to conventional multilevel converters, the director switches in the arms of AAC lead to the introduction of an overlap period, during which circuiting current can flow through the two arms in the same phase. Thus, fixed or variable overlap period control can be implemented in AAC systems so as to dynamically balance stored arm energy. However, the control of overlap period is linked to instability issues that might impede the safe operation of AAC systems, which are yet to be reported. In this paper, the stability of an AAC system is demonstrated based on measured grid and converter impedance, in conjunction with impedance-based stability criterion in the dq frame. The interaction between harmonic sources at AC and DC sides of the AAC system is analyzed to determine resonant frequencies in the AC current when any potential resonance is identified in the dq frame. Novel results with respect to the impact of overlap period on the system stability are obtained by depicting and comparing the Eigenloci in the polar plot, which are validated by real-time simulations.

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Arm Phase-Shift Conducting Modulation for Alternate Arm Multilevel Converter With Half-Bridge Submodules

Cited by 27 publications

References 25 publications

Capacitor Voltage Balancing Method for the Hybrid Multilevel Converter Considering Grid Voltage Sags

Capacitor Voltage Balancing Method for the Hybrid Multilevel Converter Considering Grid Voltage Sags

A Review on Modular Converter Topologies Based on WBG Semiconductor Devices in Wind Energy Conversion Systems

The Impact of Overlap Period on the Stability of Current-Controlled Alternate Arm Converter Based on dq Frame Impedance Analysis

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