Protection collaborative fault control for power electronic-based power plants during unbalanced grid faults

Ma, Kaiqi; Chen, Zhe; Bak, Claus Leth; Castillo, Manuel

doi:10.1016/j.ijepes.2021.107009

“…In the diamond-shaped distribution network connection, the incoming and outgoing lines of the ring network room are equipped with full circuit breakers and full protection. On the one hand, it can avoid the change of relay protection (Ma et al, 2021) caused by the access of new elements such as distributed power sources and microgrids. On the other hand, it can solve the problem that the fuse curve of the fuse of the access point of largecapacity users is difficult to match with the zero-sequence current protection setting value, and meet the access needs of largecapacity users.…”

Section: Adaptability Security and Flexibility Analysismentioning

confidence: 99%

Research and Application of a Clear Diamond-Shaped Distribution Network Structure

Liu

¹

,

Jun

²

,

Longjiang

³

et al. 2021

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Aiming at the problems of low power supply reliability, poor transfer capacity between stations, and low line utilization in the current distribution network, this paper proposes a diamond-shaped distribution network structure with a clear structure. First, we investigated the typical wiring patterns of medium-voltage distribution networks in Tokyo, Japan, Paris, France, and China’s developed cities, and summarized experience and shortcomings. Secondly, combining the typical wiring patterns of distribution networks in China and abroad, construct a diamond-shaped distribution network structure, and study its adaptability, safety and flexibility, power supply reliability, and economy. Finally, take the transformation of the wiring mode of a regional distribution network in a certain city as an example, compare the use of the diamond-shaped distribution network structure in this article with the use of cable double-ring network wiring, cable “double petal” wiring, and Shanghai diamond-type wiring distribution network grid reconstruction The effect verifies the superiority of the diamond-shaped distribution network structure in this paper.

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“…Subscripts 1 and 2 denote the positive-and negative-sequence components during the fault, and b denotes the electric quantities before the fault. In general, the electric quantities before the fault only include positive-sequence components [17], so Δ𝑈 ̇2 in (4) is equal to 𝑈 ̇2. According to the reference positive direction from the busbar to the line, the impedance angle detected by directional relays should approach -90° for forward faults in the traditional grid [9].…”

Section: B the Performance Of Psfcbdrs And Nsdrsmentioning

confidence: 99%

“…When current references are set according to (17), PSFCBDRs can operate correctly since the impedance angle seen by them will be close to -90°.…”

Section: A Positive-sequence Current Referencesmentioning

confidence: 99%

“…Another time-domain method was proposed in [16] using the transient energy difference between internal and external faults, but this method based on traveling waves required a high sampling frequency. For frequency-domain methods, the fault direction was distinguished using the current amplitude difference because the short-circuit current of SGs would be much larger than that of CIRESs [17]. Reference [10] reported that sequence superimposed impedance magnitudes of CIRESs were much higher than those of SGs, hence a new directional relay using this feature was put forward.…”

Section: Introductionmentioning

confidence: 99%

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A Control based Solution for Directional Relays of Lines with Converter-Interfaced Sources

Yang¹,

Liu²,

Zhang³

et al. 2022

Preprint

Self Cite

0

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<p>The controlled fault current of converter-interfaced renewable energy sources (CIRESs) may bring about lower sensitivity level or misoperation of fault component based directional relays (FCBDRs). In order to cope with this issue, a new control scheme is proposed to adjust sequence superimposed impedance angles of CIRESs by computing suitable current references of the CIRES controller. Meanwhile, these current references are maximized by an iterative algorithm to make full use of the short-circuit capacity of CIRESs. The proposed control scheme is applicable to various faulty conditions such as different fault types, power factors, weak grids and larger fault resistances. Compared with new directional relays that need to update protection devices, the proposed control strategy can make CIRESs compatible with commercially existing directional relays whilst the necessary fault ride through (FRT) requirements can still be satisfied. Furthermore, all the controller parameters are not required to be revised according to the detected fault type, even with only local measured data collected. The associated PSCAD simulations, real-time digital simulator (RTDS) experiment and downscale hardware experiment verify the proposed method.</p>

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“…In order to calculate reasonable current references in (17) and (22), suitable initial values of the I1m and I2m must be given considering the current limiting of the inverter. Assumed that negative-sequence current is β times the positive-sequence current, ( 23) can be obtained:…”

Section: Initial Setting Of Positive-sequence Currentmentioning

confidence: 99%

A Control based Solution for Directional Relays of Lines with Converter-Interfaced Sources

Yang¹,

Liu²,

Zhang³

et al. 2022

Preprint

Self Cite

0

View full text Add to dashboard Cite

<p>The controlled fault current of converter-interfaced renewable energy sources (CIRESs) may bring about lower sensitivity level or misoperation of fault component based directional relays (FCBDRs). In order to cope with this issue, a new control scheme is proposed to adjust sequence superimposed impedance angles of CIRESs by computing suitable current references of the CIRES controller. Meanwhile, these current references are maximized by an iterative algorithm to make full use of the short-circuit capacity of CIRESs. The proposed control scheme is applicable to various faulty conditions such as different fault types, power factors, weak grids and larger fault resistances. Compared with new directional relays that need to update protection devices, the proposed control strategy can make CIRESs compatible with commercially existing directional relays whilst the necessary fault ride through (FRT) requirements can still be satisfied. Furthermore, all the controller parameters are not required to be revised according to the detected fault type, even with only local measured data collected. The associated PSCAD simulations, real-time digital simulator (RTDS) experiment and downscale hardware experiment verify the proposed method.</p>

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Protection collaborative fault control for power electronic-based power plants during unbalanced grid faults

Cited by 22 publications

References 12 publications

Research and Application of a Clear Diamond-Shaped Distribution Network Structure

Research and Application of a Clear Diamond-Shaped Distribution Network Structure

A Control based Solution for Directional Relays of Lines with Converter-Interfaced Sources

A Control based Solution for Directional Relays of Lines with Converter-Interfaced Sources

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