The control method of three phase AC/DC converter using droop controller for multi-parallel DC distribution system

2014 ◽  
Author(s):  
Han-Soo Kim ◽  
Hee-Jun Lee ◽  
Soo-Choel Shin ◽  
Chung-Yuen Won
Keyword(s):  
Distribution System ◽  
Control Method ◽  
Dc Distribution ◽  
Three Phase

A Novel Control Strategy for Three-Phase Four-Wire STATCOM

2012 ◽  
Vol 516-517 ◽  
pp. 1722-1727 ◽  
Author(s):  
Wei Jun Yun ◽  
Gang Yao ◽  
Li Dan Zhou ◽  
Chen Chen ◽  
Jun Min Pan
Keyword(s):  
Control Strategy ◽  
Power Distribution ◽  
Distribution System ◽  
Reactive Power ◽  
Control Method ◽  
Loop Control ◽  
Power Distribution System ◽  
Imbalance Problem ◽  
Three Phase ◽  
Close Loop Control

Nowadays Static Synchronous Compensator (STATCOM) has gradually become one of the representative techniques in the field of dynamic reactive power compensation in the power distribution system. This paper analyzed the topology and the voltage imbalance problem of the up and down capacitors on DC side of the three-phase four-wire STATCOM. In allusion to the imbalance problem of neutral point, a novel control strategy based on the control of zero-sequence current was proposed. By the triple close-loop control strategy, the STATCOM can achieve great control accuracy and dynamic performance. Simulation result proves that the proposed control method is effective.

A three-port three-phase isolated DC-DC converter feasible to PV connection on a DC distribution system

2017 ◽  
Author(s):  
Raimundo N. M. de Oliveira ◽  
Luan C. S. Mazza ◽  
Demercil S. Oliveira ◽  
Herminio M. Oliveira Filho
Keyword(s):  
Distribution System ◽  
Dc Distribution ◽  
Three Phase

scholarly journals Low-Voltage Ride-Through Capability of a Single-Stage Single-Phase Photovoltaic System Connected to the Low-Voltage Grid

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Yongheng Yang ◽  
Frede Blaabjerg
Keyword(s):  
Distribution System ◽  
Single Phase ◽  
Control Method ◽  
Low Voltage ◽  
Photovoltaic System ◽  
Pv System ◽  
Pv Systems ◽  
Low Voltage Ride Through ◽  
Three Phase ◽  
Future Challenges

The progressive growing of single-phase photovoltaic (PV) systems makes the Distribution System Operators (DSOs) update or revise the existing grid codes in order to guarantee the availability, quality, and reliability of the electrical system. It is expected that the future PV systems connected to the low-voltage grid will be more active with functionalities of low-voltage ride-through (LVRT) and the grid support capability, which is not the case today. In this paper, the operation principle is demonstrated for a single-phase grid-connected PV system in a low-voltage ride-through operation in order to map future challenges. The system is verified by simulations and experiments. Test results show that the proposed power control method is effective and the single-phase PV inverters connected to low-voltage networks are ready to provide grid support and ride-through voltage fault capability with a satisfactory performance based on the grid requirements for three-phase renewable energy systems.

scholarly journals A hierarchical voltage control method for multi-terminal AC/DC distribution system

2017 ◽  
Author(s):  
Zhoujun Ma ◽  
Hong Zhu ◽  
Dahong Zhou ◽  
Chunning Wang ◽  
Renquan Tang ◽  
...  
Keyword(s):  
Distribution System ◽  
Control Method ◽  
Voltage Control ◽  
Dc Distribution

scholarly journals Analysis and Design of Three-Phase Buck Rectifier Employing UPS to Supply High Reliable DC Power

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1704 ◽  
Author(s):  
Jun-Young Lee ◽  
Kyung-Wook Heo ◽  
Kyu-Tae Kim ◽  
Jee-Hoon Jung
Keyword(s):  
Distribution System ◽  
Output Voltage ◽  
High Reliability ◽  
Voltage Level ◽  
Analysis And Design ◽  
Dual Active Bridge ◽  
Dc Distribution ◽  
Thyristor Switch ◽  
Three Phase ◽  
Uninterruptible Power

In the DC distribution system, to step down the DC voltage level from the AC grid voltage, the conventional topologies require multiple power conversion stages and bulky line-frequency transformers, which degrade their power density and cost-effectiveness. In addition, the conventional topologies suffer from a shoot-through problem resulting in their low system reliability. In this paper, to overcome the above issues, systematic design approaches of a three-phase buck rectifier with an uninterruptible power supply (UPS) and a protection algorithm are proposed to obtain the high reliability of the DC distribution system, which can deal with fault conditions and can regulate the output voltage level. It only requires a single stage of the three-phase buck rectifier. Also, a thyristor switch is added without any commutation circuits to cut off the output from the fault circuit. The shoot-through faults do not occur in the buck rectifier, leading to high reliability. A dual-active-bridge (DAB) DC-DC converter is applied as the UPS to supply the electric power from the battery when the buck rectifier is shut down under the fault conditions. Finally, the protection algorithm is proposed to detect the fault conditions and to regulate the output voltage level.

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