Increasing Energy Efficiency of Saturated-Core Fault Current Limiters With Permanent Magnets

To develop mechanical circuit breaker in high voltage direct current (HVDC) system, a fault current limiter is required. Traditional method to limit DC fault current is to use superconducting technology or power electronic devices, which is quite difficult to be brought to practical use under high voltage circumstances. In this paper, a novel concept of high voltage DC transmission system fault current limiter (DCS-FCL) based on saturable core was proposed. In the DCSFCL, the permanent magnets (PM) are added on both up and down side of the core to generate reverse magnetic flux that offset the magnetic flux generated by DC current and make the DC winding present a variable inductance to the DC system. In normal state, DCSFCL works as a smoothing reactor and its inductance is within the scope of the design requirements. When a fault occurs, the inductance of DCSFCL rises immediately and limits the steepness of the fault current. Magnetic field simulations were carried out, showing that compared with conventional smoothing reactor, DCSFCL can decrease the high steepness of DC fault current by 17% in less than 10ms, which verifies the feasibility and effectiveness of this method. © 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license

show abstract

“…1(a). Former researchers 12 proposed a modified AC FCL and its simplified topology is shown in Fig. 1(b).…”

Section: A Basic Principal Of the Conceptmentioning

confidence: 99%

A novel concept of fault current limiter based on saturable core in high voltage DC transmission system

et al. 2018

View full text Add to dashboard Cite

show abstract

“…What"s more, the DC biasing circuit cost is one of the largest costs of operating saturatedcore FCLs. The energy consumption is estimated assuming each coil has a nominal resistance of 0.1 and a projected lifetime of 30 years (≈263000hours) [9]. It can be found that a significant reduction in energy consumption can be achieved by using PMs.…”

Section: B Mmf and The Energy Consumptionmentioning

confidence: 99%

“…Content may change prior to final publication. The uniformity of core saturation is related to the normal condition impedance, which could affect the voltage drop under normal condition [9]. Fig.…”

Section: B Mmf and The Energy Consumptionmentioning

confidence: 99%

“…However, superconducting biased method is expensive and complex, and permanent magnet (PM) biased FCLs are only suitable for applying in the low voltage system for the finite flux density of PM [6][7][8]. A hybrid DC-coil/PM method is discussed in an open-core SFCL to reduce the required DC MMF [9]. The hybrid FCL greatly increased the energy efficiency, whereas the reduced DC MMF is still great compared to closed-core FCLs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Bridge-Type Hybrid Saturated-Core Fault Current Limiter Based on Permanent Magnets

et al. 2015

View full text Add to dashboard Cite

To reduce the requirement of DC-coil-generated magneto-motive force (DC MMF), this paper analyses the method of using permanent magnets (PMs) to saturate the core. In this paper, a novel bridge-type hybrid saturated-core fault current limiter (BHFCL) is proposed to investigate the influence of PM. For the BHFCL, a bridge structure is designed to guarantee fault clipping performance, with a fault limiting reactor. Also, the compact structure of magnetic device and the shared coil of AC and DC could reduce cost and losses. To compare the influence of PMs on the performance of BHFCL and validate the effectiveness of the proposed BHFCL, various FEA simulation models in a simple system are carried out by ANSOFT. Simulation results demonstrate that the BHFCL could achieve considerable energy consumption reduction with little effect on the normal condition voltage drop as well as fault clipping ability. The BHFCL is efficient in fault clipping and the performance is shown to depend mainly on the value of the reactor included in the bridge.Index Terms-Fault current limiter (FCL), permanent magnet, steel core, magneto-motive force (MMF).

show abstract

“…One major problem of SCFCLs is their high requirement for DCcoil-generated magneto-motive force (MMF). The required MMF can also be produced by permanent magnets beside superconducting coils [4][5]. With the development of permanent magnets, a number of permanent magnet-biased fault-current limiters (PFCLs) have been proposed in recent years for limiting fault current levels [6][7][8][9].Two main reasons that available PFCLs remain limited to low-voltage prototypes are the finite flux density of permanent magnets as biasing sources and the risks of demagnetization and reverse saturation.…”

Section: Introductionmentioning

confidence: 99%

Performance Investigation of a Novel Permanent Magnet-Biased Fault-Current Limiter

et al. 2015

View full text Add to dashboard Cite

The fault current limiter (FCL) is one of the most useful measures for limiting fault currents in power systems. This paper introduces a new structure for a parallel-type permanent magnet-biased saturation-based fault current limiter (PPFCL). The PPFCL consists of two magnetic devices connected in parallel and in magnetic counter opposite to each other. The operating principle and the core inductances in different states were analyzed using an electromagnetic equivalent circuit. In addition, a 220V/10A experimental prototype was designed and tested in a simple system and compared with Maxwell-3D simulation and analytical methods. Finally, a 10-kV case-study model was created and compared with a series-type FCL, which verified the effectiveness of the limiter in high-voltage, large-capacity application. Experimental and simulation results have demonstrated that the PPFCL exhibits fast response and low impedance during normal operations, as well as high bias capability and low possibility of demagnetization of the permanent magnet during fault conditions.Index Terms-Fault current limiter (FCL), permanent magnet, topology, parameter design.

show abstract

Increasing Energy Efficiency of Saturated-Core Fault Current Limiters With Permanent Magnets

Cited by 41 publications

References 7 publications

A novel concept of fault current limiter based on saturable core in high voltage DC transmission system

A novel concept of fault current limiter based on saturable core in high voltage DC transmission system

A Novel Bridge-Type Hybrid Saturated-Core Fault Current Limiter Based on Permanent Magnets

Performance Investigation of a Novel Permanent Magnet-Biased Fault-Current Limiter

Contact Info

Product

Resources

About