Reverse Power Flow Control in a ST-Fed Distribution Grid

@article{DeCarne2018ReversePF,
  title={Reverse Power Flow Control in a ST-Fed Distribution Grid},
  author={Giovanni De Carne and Giampaolo Buticchi and Zhixiang Zou and Marco Liserre},
  journal={IEEE Transactions on Smart Grid},
  year={2018},
  volume={9},
  pages={3811-3819}
}
The massive integration of distributed generation in the grid poses new challenges to the system operators, like the reverse power flow from the low voltage (LV) to medium voltage (MV) grid. In the case of high DG power production and low load absorption, the voltage rises in the line reaching the upper voltage limit. At this regard the smart transformer (ST) offers a new possibility to limit the reverse power flow in the MV grids. The ST can adapt the voltage waveform modifying the frequency… 

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References

SHOWING 1-10 OF 29 REFERENCES

Frequency adaptive control of a smart transformer-fed distribution grid

An advanced service provided by the Smart Transformer (ST) is the decoupling between the Medium Voltage (MV) and Low Voltage (LV) grids. In the LV side, the ST can modify the waveform's frequency in

Reactive Power Capacity Enhancement of a PV-Grid System to Increase PV Penetration Level in Smart Grid Scenario

TLDR
A novel scheme, where an auxiliary circuit (comprising an inverter and reactive power bank, RPB), in conjunction with a PV-grid system, increases the system's reactive power compensation capacity up to 300% compared to the original or dedicated VAR capacity of the main PV inverter, is proposed.

Load Control Using Sensitivity Identification by Means of Smart Transformer

TLDR
Two possible applications are proposed: 1) the smart transformer overload control by means of voltage control action and 2) the soft load reduction method, that reduces load consumption avoiding the load disconnection.

Load control using sensitivity identification by means of smart transformer

TLDR
Two possible applications are proposed: the Smart Transformer overload control by means of voltage control action, and the Soft Load Reduction method, that reduces load consumption avoiding the load disconnection.

Frequency-based control of a micro-grid with multiple renewable energy sources

Stand-alone micro-grids need a proper management of the active power exchange. This work is focused on the parallel operation of multiple grid-connected converters in an island-grid system. The

Improved Low Voltage Grid-Integration of Photovoltaic Systems in Germany

This work discusses the technical and economical benefits of different active and reactive power control strategies for grid-connected photovoltaic systems in Germany. The aim of these control

A Monitoring Technique for Reversed Power Flow Detection With High PV Penetration Level

TLDR
It will be shown that by utilizing this monitoring technique, not only the small variation of PV PL can be easily detected, but also some fast transients such as the effect of cloud movement on PV system can be monitored.

Coordinated Control of Distributed Energy Storage System With Tap Changer Transformers for Voltage Rise Mitigation Under High Photovoltaic Penetration

This paper proposes a coordinated control of distributed energy storage system (ESS) with traditional voltage regulators including the on-load tap changer transformers (OLTC) and step voltage

Optimal Power Scheduling for Smart Grids Considering Controllable Loads and High Penetration of Photovoltaic Generation

TLDR
A decision technique of an optimal reference schedule for DGs, battery energy storage system (BESS), CLs, and tap changing transformers to achieve loss reduction in the distribution system is proposed.

Distributed Reactive Power Generation Control for Voltage Rise Mitigation in Distribution Networks

This paper addresses the problem of voltage rise mitigation in distribution networks with distributed generation. A distributed automatic control approach is proposed to alleviate the voltage rise