Power supply risk assessment method for relay protection system faults

Tuyou, Si; Jiekang, Wu; Wang, Yüan; An'an, Du

doi:10.1515/aee-2016-0056

Cited by 2 publications

(3 citation statements)

References 22 publications

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“…The method for assessing the probability of risk in the power supply is due to faults of the system's protection relay, which considers the probability of a malfunction in relay protection systems. The availability and suitability of the risk assessment method for the protection relay of systems were tested on two models studied in [20]. Power systems can be affected by unforeseen and unavoidable faults and failures, making safety assessment a serious issue that requires significant research work [21].…”

Section: Related Workmentioning

confidence: 99%

“…The power flow program is used to assess all buses' voltage and active power. The static security risk (R) and load shedding can be calculated using Equations ( 13) to (20), in the values of the constants are ∝ L =∝ V =∝ f = 0.005, P r r j = 1/33, V max = 1.05, V min = 0.95, f max = 1.05 and f min = 0.95. The net loss coefficient can be calculated using the steady-state load flow of the IEEE distribution system σ = P netlosses P gnet , P netlosses are the net losses of the network, and P gnet is the overall generation of the system.…”

Section: Static Security Risk Evaluation Outcomesmentioning

confidence: 99%

“…The static security risk (R) and load shedding can be calculated using Equations ( 13)- (20). Table 7 shows the static security risk and load shedding values during the fault at buses #2, 3, 4, 6, 7, 8, 12 and 13.…”

Section: Static Security Risk Evaluation Outcomesmentioning

confidence: 99%

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Improvement of Fault Current Calculation and Static Security Risk for Droop Control of the Inverter-Interfaced DG of Grid-Connected and Isolated Microgrids

et al. 2022

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The contribution current of an inverter-interfaced distributed generator unit during a fault is one of the significant challenges for two modes: grid-connected and isolated AC microgrid. For this challenge, this article is aimed to study two methods of fault current calculation for two modes: grid-connected and isolated microgrids. These methods include a virtual equivalent impedance and a proposed method. The proposed method is a new technique for calculating the fault current contribution depending on the droop control of inverter-interfaced DG. The proposed method can control the contribution short-circuit current of DG within its limit (2 p.u.) where it is dependent on the voltage value of the DG bus to calculate the short circuit current of DG by using the control criterion. Static security risk and load shedding are calculated after fault clearance using an operation scenario in which the distribution system will be divided into small subsystems and is then grid-connected and isolated due to the removal of the faulted bus by protection devices. The proposed technique is applied to a standard IEEE 33-bus distribution network with five DGs. The results show that the contribution current of inverter-interfaced DG during the fault has more effects than the fault current of the nearest faulted bus to the DG bus. The proposed technique improves the calculated fault current value by about 30% for the grid-connected microgrid and by about 50% for the isolated microgrid from its value of the virtual impedance method. The static security risk is improved after load shedding. The static security risk improved by about 0.025%.

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Section: Related Workmentioning

confidence: 99%

Section: Static Security Risk Evaluation Outcomesmentioning

confidence: 99%

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Improvement of Fault Current Calculation and Static Security Risk for Droop Control of the Inverter-Interfaced DG of Grid-Connected and Isolated Microgrids

et al. 2022

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Application of Wavelet Packet and Fuzzy Algorithm in Power System Short Circuit Fault Classification

Qiu

2022

Mathematical Problems in Engineering

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Short-circuit fault, also known as a lateral fault, is one of the common types of faults in power transmission lines. This paper proposes an accurate method for identifying short-circuit fault types for power transmission line systems. According to the three-phase A, B, and C values, short-circuit faults can be subdivided into ten classes. An MDL power system with controllable short-circuit fault types is designed and tested. The method of using wavelet packet to analyze short-circuit fault waveforms and using the fuzzy controller to analyze eigenvectors is also proposed. Wavelet packet analysis makes up for the defect that wavelet transform usually only decomposes low frequencies and retains high frequency. Therefore, more accurate frequency band information and eigenvectors are obtained through wavelet packet transform, and then, the fuzzy controller is used to identify the eigenvectors, which can effectively detect and discriminate short-circuit fault types. Accurate identification of short-circuit fault types can improve transmission lines’ overall operational efficiency and promote the power system’s development.

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Power supply risk assessment method for relay protection system faults

Cited by 2 publications

References 22 publications

Improvement of Fault Current Calculation and Static Security Risk for Droop Control of the Inverter-Interfaced DG of Grid-Connected and Isolated Microgrids

Improvement of Fault Current Calculation and Static Security Risk for Droop Control of the Inverter-Interfaced DG of Grid-Connected and Isolated Microgrids

Application of Wavelet Packet and Fuzzy Algorithm in Power System Short Circuit Fault Classification

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