Solid State Transformer for Low-Voltage Distribution System with DC/DC Stage-Controlled Split-Capacitor

Ouyang, Shaodi; Liu, Jinjun; Song, Shuguang; Chen, Xingxing; Yang, Yue; Wu, Hongda

doi:10.1109/ecce.2019.8913205

Cited by 4 publications

(6 citation statements)

References 9 publications

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“…2) Case 2 (0.1-0.2 s): the unbalanced power transfer requirement is -0.8P O (-0.8 MW). According to (10) and ( 23), the DC offset injected into the primary and secondary sides is 40 A and -106.67 A, respectively.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Considering that the bipolar system contains n SMs, the following equation can be obtained according to (9): (10) From ( 7) and ( 9), the DC offset injection at the secondary side of NPC-DAB converter does not affect the total power transmitted by the bipolar system, while the unbalanced power between two poles can be transferred.…”

Section: B Steady-state Model Of Grid-connected Modementioning

confidence: 99%

“…10(a). According to (10), DP between bipolar poles can be controlled by adjusting I dc2 . In the bipolar unbalanced power control, the PI controller takes the difference between the sampled DP and reference DP ref , and the outcome becomes a reference current value I dc2,1ref for the DC offset injection controller, as shown in Fig.…”

Section: Control Strategymentioning

confidence: 99%

“…1(b), the interface converter is indispensable for the interconnection of the bipolar LVDC distribution system and the medium-voltage DC (MVDC) utility grid. Three candidate implementations with bipolar DC configurations are discussed in [10] and [11]. The first type uses two sets of equipment to provide positive and negative poles, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…2(c). This, however, requires more semiconductors and more magnetic materials as well as much higher control complexity [18].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Power and Voltage Control Based on DC Offset Injection for Bipolar Low-voltage DC Distribution System

Kong,

Zhang,

Zhou

et al. 2023

Journal of Modern Power Systems and Clean Energy

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The bipolar low-voltage DC (LVDC) distribution system has become a prospective solution to better integration of renewables and improvement of system efficiency and reliability. However, it also faces the challenge of power and voltage imbalance between two poles. To solve this problem, an interface converter with bipolar asymmetrical operating capabilities is applied in this paper. The steady-state models of the bipolar LVDC distribution system equipped with this interface converter in the gridconnected mode and off-grid mode are analyzed. A control scheme based on DC offset injection at the secondary side of the interface converter is proposed, enabling the bipolar LVDC distribution system to realize the unbalanced power transfer between two poles in the grid-connected mode and maintain the inherentpole voltage balance in the off-grid mode. Furthermore, this paper also proposes a primary-side DC offset injection control scheme according to the analysis of the magnetic circuit model, which can eliminate the DC bias flux caused by the secondaryside DC offset. Thereby, the potential core magnetic saturation and overcurrent issues can be prevented, ensuring the safety of the interface converter and distribution system. Detailed simulations based on the proposed control scheme are conducted to validate the function of power and voltage balance under the operation conditions of different DC loads.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: B Steady-state Model Of Grid-connected Modementioning

confidence: 99%

Section: Control Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…2(c). This, however, requires more semiconductors and more magnetic materials as well as much higher control complexity [18].…”

Section: Introductionmentioning

confidence: 99%