Reducing Peak Current and Energy Dissipation in Hybrid HVDC CBs Using Disconnector Voltage Control

Hedayati, Mohammad H.; Jovcic, Dragan

doi:10.1109/pesgm40551.2019.8973798

Cited by 10 publications

(24 citation statements)

References 3 publications

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“…5 shows the experimental LC DC CB. The high-speed disconnector operates in around 2 ms with 3 mm separation in air, and it is described in [17,22]. Copper contacts of 20 mm width are used, while the closed-state overlap is OL = 1.5 mm.…”

Section: Experimental Circuitmentioning

confidence: 99%

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Series LC DC circuit breaker

Jovcic

2019

High Voltage

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The article proposes a mechanical DC circuit breaker (CB) based on a series LC circuit. It requires two switches (a fast disconnector and an AC circuit breaker), an inductor and a capacitor, and therefore the cost is expected to be low. A series LC circuit is analysed and it is concluded that fault current will always have natural zero-current crossings which enable use of simple AC CBs. The current commutation into a capacitor is investigated since this is important for successful operation. A number of analytical conditions are derived for the voltage stress across disconnector contacts which enable arc-less contact opening. Experimental results on a 900 V laboratory prototype LC DC CB illustrate successful DC fault clearing, with commutation of 130 A and peak DC current of 190 A. A detailed PSCAD model for 320 kV LC DC CB is developed and DC fault clearing is evaluated in order to understand the possible benefit for high-voltage direct current applications. Further comparisons with the commercialised hybrid DC CB and mechanical DC CB on 320 kV system illustrate some benefits in terms of performance and simplicity. The mechanical LC DC CB operates very fast because of early capacitor insertion, and this results in low peak current and energy dissipation.

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Section: Experimental Circuitmentioning

confidence: 99%

“…The experimental LC DC CB is using the same test system, same disconnector and control as the reported hybrid DC CB [22], to enable comparison. However in [22] the current peaks at much 6 Evaluation of 320 kV series LC DC CB…”

Section: Testing DC Fault Current Interruptionmentioning

confidence: 99%

Series LC DC circuit breaker

Jovcic

2019

High Voltage

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“…Although [24] proposed a new type of HCB based on a disconnector voltage control technique that can reduce peak current as well as energy wastage. And [25] proposed a LVDC HBD topology that was shown to dissipate less energy.…”

Section: A Problem Statementmentioning

confidence: 99%

An Improved DC Circuit Breaker Topology Capable of Efficient Current Breaking and Regeneration

Lumen

Kannan

Mahmud

et al. 2022

IEEE Trans. Power Electron.

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The DC power system, due to its convenience of conversion, integration, and use, is getting immense attention in the field of power transmission and distribution. It is superior to traditional AC systems in terms of efficiency, reliability, and control simplicity as well. A DC circuit breaker is one of the important elements of any DC power system. It is a sophisticated technology designed to break DC current only. The breaking of a DC current is always challenging compared to the breaking of an AC current, as DC current does not have natural zero crossing points like AC current has. Moreover, DC current breaking becomes more critical when the current is inductive as energy stored in the network inductance opposes instantaneous current breaking. Hence, this energy needs to be absorbed and dissipated as heat during the current breaking operation, which is exactly what is done in the traditional DC circuit breaker topologies. This paper introduces a new topology for DC circuit breakers with a mechanism to reuse this stored energy instead of dissipating it. The mechanism is analogous to regenerative braking in electric drive systems and can enhance the overall system efficiency. The proposed scheme was analyzed through rigorous computer simulation and was experimentally validated.

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“…Experimental verification of topology 2 has been carried out using 900 V, 500 A DC CB test circuit and HCB prototype, described in [18]. The main breaker parameters are given in Table III in the appendix.…”

Section: Laboratory Hardware Demonstrationmentioning

confidence: 99%

Bidirectional Hybrid HVDC CB With a Single HV Valve

Jovcic

Zaja

Hedayati

2020

IEEE Trans. Power Delivery

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This paper examines two new bidirectional hybrid dc circuit breaker topologies for application in meshed dc grids. The goal is to retain performance of hybrid DC CB with bidirectional current interruption, while reducing semiconductor count, DC CB size and weight. The fault current is routed to the unidirectional internal valve using multiple additional ultrafast disconnectors. Operation of both topologies is studied using a 320 kV, 16 kA simulation model, as well as demonstrated on a 900 V, 500 A lab prototype. The control systems are presented and discussed in detail. The low-voltage hardware prototypes verify performance of several new technical and operating solutions in laboratory conditions. A comparison is made with the existing DC CB topologies and performance and reliability compromises of each topology are assessed. The conclusion is that it might be possible to halve the DC CB semiconductor count while retaining same 2 ms opening speed and bidirectional operation.

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Reducing Peak Current and Energy Dissipation in Hybrid HVDC CBs Using Disconnector Voltage Control

Cited by 10 publications

References 3 publications

Series LC DC circuit breaker

Series LC DC circuit breaker

An Improved DC Circuit Breaker Topology Capable of Efficient Current Breaking and Regeneration

Bidirectional Hybrid HVDC CB With a Single HV Valve

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