Abstract
In order to overcome the problems of power flow control and fault current limiting in multiterminal HVDC (MTDC) Grids, this paper proposes a Modular Multi-terminal DC Power Flow Controller (MM-DCPFC) with fault current limiting function. The topology structure, operation principle and equivalent circuit of MM-DCPFC are introduced, and such a structure has the advantages of modularity and scalability. The power balance mechanism is studied and a hierarchical power balance control strategy is proposed. The results show that MM-DCPC can achieve internal power exchange, which avoid the use of external power supply. The fault characteristics of MM-DCPFC are analyzed, fault current limiting and self-protection methods are proposed, and the factors affecting the current limiting capability are studied. The simulation models are established in PLECS, and the simulation results verify the effectiveness of MM-DCPFC in power flow control, fault current limiting, and scalability. In addition, a prototype is developed to validate the function and control method of MM-DCPFC.
Highlights
IT is beneficial for solving the problem of energy shortage by developing renewable energy vigorously [1], [2]
Multi-terminal high voltage direct current (MTDC) grid, which is highly reliable and stable relative to conventional AC grid, is one of the most effective technologies to solve the issues of grid integration, transmission, and absorption of renewable energy [3], [4]
This paper proposes a modular multi-terminal DC power flow controller (MM-DC power flow controllers (DCPFCs)), which can realize the free regulation of the current between multiple lines and perform a current limiting function when a short-circuit fault occurs in the DC system
Summary
IT is beneficial for solving the problem of energy shortage by developing renewable energy vigorously [1], [2]. This paper proposes a modular multi-terminal DC power flow controller (MM-DCPFC), which can realize the free regulation of the current between multiple lines and perform a current limiting function when a short-circuit fault occurs in the DC system. Since MM-DCPFC achieves its power balance through a hierarchical control strategy, it does not need external power supply, nor does it need transformers, inductors, and other magnetic components to complete pow‐ er exchange It is of small size, low cost, and high efficiency. The fault current limiting is realized by the original topology without increasing the complexity of DCPFC structure, which can reduce the interruption current of the DCCB.
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