Detecting High-Impedance Fault with Z-Source Circuit Breakers in Smart Grids

Bhatta, Sagar; Zhang, Yucheng; Fu, Ruiyun

doi:10.1109/apec39645.2020.9124091

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…Figure 2 shows the operation of a ZCB with the specification of Table 1 for two different cases of fault current: Case I with a fault current I F = 5 A, which was less than twice the rated load current; and Case II with I F = 7 A, which was higher than twice the rated load current. It is observed that the breaker was irresponsive in Case I, whereas the fault current was cut off successfully in Case II [38]. This test proved the feasibility of control of ZCB's responsive behavior to HIFs by specifying its parameters.…”

Section: Parametermentioning

confidence: 57%

“…The specification of ZCB is enabled by adjusting the Z-source capacitors properly. Beyond the feasibility of HIF detection revealed in [38], this paper conducted comprehensive analysis on the The result of Table 5 proved the effectiveness of using (1) to specify the HI-Mode/HI-Mode for ZCB in another high power case. It also verified the general usage of (1) for the proposed method of specifying ZCBs for HIF detection and interruption.…”

Section: Discussionmentioning

confidence: 90%

“…This is an easy and efficient way in the practical application to realize the HDM/HIM specification in ZCB. The feasibility of this new method was originally revealed in our prior study of [38]. Beyond that point, this paper introduces the theoretical analysis to the revealed, derives a mathematical relationship between the maximum HIF resistance and the required Z-source capacitances in ZCB, and verify its effectiveness with the original experiment tests in [38] and the new high power simulation tests first presented in this paper.…”

Section: Zcb and Hif Detection/interruption Modesmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

“…The specification of ZCB is enabled by adjusting the Z-source capacitors properly. Beyond the feasibility of HIF detection revealed in [38], this paper conducted comprehensive analysis on the Z-source capacitance specification and derived a mathematical relationship between the maximum HIF resistance and required Z-source capacitance with enhanced verification tests. The derived equation has been verified by the circuit analysis and parameter specification methods.…”

Section: Discussionmentioning

confidence: 99%

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A New Method of Detecting and Interrupting High Impedance Faults by Specifying the Z-Source Breaker in DC Power Networks

Bhatta

Zhang

2020

Electronics

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High impedance faults (HIFs) that cause a relatively smaller current magnitude compared to the traditional low impedance faults are not easily detectable but can cause an extreme threat to electric apparatus and system operation. This paper introduces a new method of detecting and interrupting HIFs in DC power networks by specifying Z-source circuit breakers (ZCBs). The ZCB is a protective device for high power DC branches, with the capabilities of protecting bidirectional power flow and automatic/controllable turnoff function. In this new method, the operational mode of ZCB (i.e., either the detection mode or interruption mode) can be specified. Beyond previous research, the theoretical analysis has been performed on this method and the mathematical relationship between the maximum HIF resistance and required Z-source capacitance has been derived and verified. It has been found that the ZCB can respond to a HIF accordingly when its capacitances are properly adjusted in the ZCB circuit. With the adjustment of these Z-source capacitances, the ZCB can be specified to detect and report a HIF status to power system operators, or cut off the HIF branch and protect the rest of the DC system directly. The new method can detect/interrupt a HIF that is as small as 2 times of its nominal rated current and the effectiveness and general usage of the derived equation have been verified by both low power experiments in lab and high power simulation tests.

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Section: Parametermentioning

confidence: 57%

Section: Discussionmentioning

confidence: 90%

Section: Zcb and Hif Detection/interruption Modesmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

“…The specification of ZCB is enabled by adjusting the Z-source capacitors properly. Beyond the feasibility of HIF detection revealed in [38], this paper conducted comprehensive analysis on the Z-source capacitance specification and derived a mathematical relationship between the maximum HIF resistance and required Z-source capacitance with enhanced verification tests. The derived equation has been verified by the circuit analysis and parameter specification methods.…”

Section: Discussionmentioning

confidence: 99%

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