Bridge‐type fault current limiter and hybrid breaker for HVDC grids applications

Heidary, Amir; Rouzbehi, Kumars; Hesami, Morteza; Bigdeli, Mehdi; Bordons, Carlos

doi:10.1049/iet-gtd.2020.0013

Cited by 27 publications

(7 citation statements)

References 24 publications

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“…In other words, during the fault period, the control system does not reduce the firing angle of the inverter and does not block the inverter and keeps the DC line ready to be immediately connected when the fault is cleared. After detecting AC fault (three-phase or single-phase) by ( 19) to (21), the created forced angle value is sent to the inverter control system.…”

Section: Fault Ride Through Capability Under Dc/ac Faultsmentioning

confidence: 99%

“…In the HVDC systems, the initial voltage surge wave frequency can be estimated based on the damping rate and the control system uses such signals for voltage/frequency control under faults [20]. The equivalent models of LCC‐HVDC system under symmetric and asymmetric faults of the AC system can be presented by considering the relationship between the current injection of the LCC‐HVDC system and the phase voltage of the discharge passage fault [21]. Application of reverse blocker modular multi‐level converter topology to improve DC fault control capability of HVDC system is also reported.…”

Section: Introductionmentioning

confidence: 99%

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Multifunctional scheme for frequency/voltage/stability control in HVDC line under concurrent cyber‐attacks and faults

Hemmati

Faraji

2021

IET Generation Trans & Dist

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This paper presents a control mechanism on high voltage direct current (HVDC) transmission line for frequency/voltage regulation, fault ride through (FRT) capability, and cyber‐attack/fault detection. The network under study consists of two areas with different frequencies that are connected through one 300 km HVDC line. The proposed control system regulates the frequency in both areas by managing power through HVDC line. The converters on both sides of HVDC line are controlled to handle faults on the DC and AC sections as well as improving fault ride through capability. The control strategies are implemented and operated depending on fault/cyber‐attack type and behaviour. In this respect, the control mechanism may change the firing angle of converters, switch their operating mode from rectifier to converter and vice‐versa or even block the converters. The proposed paradigm successfully distinguishes between the cyber‐attacks and faults. The simulations in MATLAB software validate that the proposed mechanism realizes all the objectives and the cyber‐attacks are completely identified and separated from the faults.

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Section: Fault Ride Through Capability Under Dc/ac Faultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multifunctional scheme for frequency/voltage/stability control in HVDC line under concurrent cyber‐attacks and faults

Hemmati

Faraji

2021

IET Generation Trans & Dist

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“…Two independent AC asynchronous systems, denoted as AC area #1 and AC area #2, were connected through different grid-side VSCs (GVSCs), denoted as GVSC1 and GVSC2, respectively. B1~B8 are DC circuit breakers, which might include significant series inductors [25], [26].…”

Section: Multi-terminal Hvdc With Wind Farmsmentioning

confidence: 99%

Adaptive Virtual Capacitor Control for MTDC System With Deloaded Wind Power Plants

2020

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Coordinated droop control strategies can provide frequency support for AC area grids from wind farms integrated through multi-terminal high-voltage DC (MTDC) transmission. However, such a strategy inevitably causes DC voltage deviation for transmitting AC area frequency information, thereby deteriorating the stability and security of the MTDC system operation. This paper reports an improved adaptive virtual capacitor control strategy that can provide inertial support for the system. Instead of increasing the capacitance of the physical capacitor, a virtual capacitor is generated by utilizing the rest energy of the deloaded wind farm. Furthermore, an S-shape function is designed to adaptively adjust the capacitance of the virtual capacitor based on the operating points of the system, in order to provide a better inertial support than with the fixed virtual capacitor control strategy. The proposed strategy not only enhances the DC voltage nadir but also improves the frequency nadir of the AC area by releasing additional power from the deloaded wind farm., a MTDC system of a four-terminal voltage source converter with two wind farms is simulated using PSCAD/EMTDC. Case studies are conducted to compare and demonstrate the effectiveness of the proposed strategy under sudden load variations. INDEX TERMS droop control, frequency regulation, wind farm, inertia response, virtual capacitor, VSC-MTDC.

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“…Literature [19] suggested that the ability to recover from DC line faults could be achieved by delaying the trigger angle of the LCC and by installing high power diodes in overhead lines close to the inverter. With the emergence of the multi-terminal DC transmission technology, the design and application of DC circuit breakers have been significantly progressed [20]. Literature [21] presented the key technologies of the DC circuit breaker with the commutation drive circuit from four aspects (I.e., topology, fast mechanical switch, power electronics and com-mutation principle).…”

Section: Introductionmentioning

confidence: 99%

Research on Overvoltage Suppression by Blocking Diode and DC Circuit Breaker in LCC-VSC Hybrid HVDC System

Wang

Zhou

2021

IEEE Access

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In this study, a LCC-VSC hybrid HVDC transmission system was taken as an example. The valve and neutral overvoltage of the hybrid HVDC system were simulated and then calculated at the VSC converter station by installing a blocking diode and a DC circuit breaker, as well as by grounding after neutral bus outage. The isolation effect of the blocking diode and the DC circuit breaker on the VSC converter station in the protection and the effect on the DC overvoltage were compared, and the difference was analyzed by complying with the mechanism of overvoltage. The effect of different locations of the blocking diode on the overvoltage suppression was compared, and it was concluded that different locations of blocking diode could raise different requirements for the insulation coordination of the converter valve. By analyzing energy sources of the neutral bus overvoltage at different stages, it was further concluded that the energy stored in the distributed inductance of the metal return line could be a vital source of neutral bus overvoltage energy. On that basis, an overvoltage suppression strategy for grounding neutral bus directly after the stop of the converter station was proposed.

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Bridge‐type fault current limiter and hybrid breaker for HVDC grids applications

Cited by 27 publications

References 24 publications

Multifunctional scheme for frequency/voltage/stability control in HVDC line under concurrent cyber‐attacks and faults

Multifunctional scheme for frequency/voltage/stability control in HVDC line under concurrent cyber‐attacks and faults

Adaptive Virtual Capacitor Control for MTDC System With Deloaded Wind Power Plants

Research on Overvoltage Suppression by Blocking Diode and DC Circuit Breaker in LCC-VSC Hybrid HVDC System

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