Protection Coordination of AC/DC Intersystem Faults in Hybrid Transmission Grids

Prommetta, Jonas; Schindler, Jakob; Jaeger, Johann; Keil, T.; Butterer, Christoph; Ebner, G.

doi:10.1109/tpwrd.2020.3000731

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…Moreover, high voltage AC transmission has the characteristics of high voltage level, large transmission capacity, and long transmission distance. The implementation of real-time online monitoring of its line is a necessary measure to ensure the safe, stable, and reliable operation of EHV line [1].…”

Section: Introductionmentioning

confidence: 99%

Application of Internet of Things Energy System in Dynamic Risk Assessment of Composite Fault of Transmission Line

Liu

Jia

Ding

et al. 2022

Wireless Communications and Mobile Computing

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In order to study the application of Internet of things energy system in complex fault risk dynamic assessment of transmission line. Firstly, the concept of power grid dynamic risk assessment is introduced, and the process of power grid dynamic risk assessment system based on Internet of things is designed. Then, it puts forward how to use the ubiquitous Internet of things multisource data to solve the key problems such as dynamic perception of fault probability, dynamic selection of fault set, dynamic generation of post fault state, and dynamic risk assessment of operation process. Finally, taking the maximum operation mode of a provincial power grid in summer 2013 as an example, this paper selects key 500 kV transmission lines for risk assessment, and the actual power grid example shows that. The power grid comprehensive risk assessment system considering the fault characteristics of transmission lines can effectively predict the fault probability of transmission lines; distinguish the two risks of high loss, low probability, and low loss and high probability; and provide guidance for operators. It is practical and effective.

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Section: Introductionmentioning

confidence: 99%

Application of Internet of Things Energy System in Dynamic Risk Assessment of Composite Fault of Transmission Line

Liu

Jia

Ding

et al. 2022

Wireless Communications and Mobile Computing

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“…The DC system is a bipolar half-bridge MMC-HVDC system. The neutral points on both ends are connected through dedicated metallic return (DMR) line [20], which is grounded on M side. The HVAC system is solid-grounded on both ends.…”

Section: Equivalent Fault Circuitmentioning

confidence: 99%

“…Since a significant 50 Hz component intrudes into DC system after intersystem faults, the criteria based on 50 Hz voltage and current are applied to DC system to detect intersystem faults in a targeted manner, including LCC-HVDC system and flexible HVDC system [13,14,17,20]. Since intersystem fault can still cause significant overcurrent, as shown in Figure 4, half-bridge MMC will still be blocked within several ms, which is shorter than the time required to detect 50 Hz component.…”

Section: Intersystem Fault Protection Based On 50 Hz Componentmentioning

confidence: 99%

“…The impact of intersystem faults on AC protection was analysed in [19], where solid‐ and resonant‐ grounded AC systems were considered respectively. Consequently, the coordination scheme for DC and AC protections was proposed in [20]. The electrical characteristics of DC systems based on half‐bridge and full‐bridge MMC after intersystem faults were compared in [21], which emphasized the hazard when an intersystem fault occurs to half‐bridge MMC‐HVDC system.…”

Section: Introductionmentioning

confidence: 99%

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Intersystem fault between MMC‐HVDC and AC systems and its impact on DC/AC protection

Wang

et al. 2021

IET Generation Trans & Dist

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Flexible DC and AC transmission lines can be arranged across vertically or sharing transmission corridor. Under this condition, the possibility of intersystem fault increases significantly, which endangers the safety of both DC and AC systems. Here, the intersystem fault between bipolar half‐bridge MMC‐HVDC system and AC system is analysed. The reliability of DC wavefront protection after intersystem fault is analysed based on initial traveling wave, while the reliability of DC intersystem fault protection and AC protection is analysed based on 50 Hz component characteristics. Since wavefront protection cannot be guaranteed to operate reliably, intersystem fault protection based on 50 Hz components is applied to DC system to reliably detect intersystem faults and isolate the fault by commanding DC circuit breaker to trip. Although current differential relaying and zero‐sequence overcurrent relaying in AC system can reliably detect intersystem faults, a large DC offset prevents effective fault isolation of AC circuit breaker. This highlights the necessity of MMC‐HVDC system to reliably isolate intersystem faults.

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Transient characteristics and protection coordination strategy of hybrid AC / DC system based on modular multilevel converters under AC/DC transmission lines touching fault

Protection Coordination of AC/DC Intersystem Faults in Hybrid Transmission Grids

Cited by 8 publications

References 18 publications

Application of Internet of Things Energy System in Dynamic Risk Assessment of Composite Fault of Transmission Line

Application of Internet of Things Energy System in Dynamic Risk Assessment of Composite Fault of Transmission Line

Intersystem fault between MMC‐HVDC and AC systems and its impact on DC/AC protection

Transient characteristics and protection coordination strategy of hybrid AC / DC system based on modular multilevel converters under AC/DC transmission lines touching fault

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