Sensitivity Analysis to Operation Margin of Zone 3 Impedance Relays With Bus Power and Shunt Susceptance

Li, Shenghu; Yorino, Naoto; Ding, Ming; Zoka, Yoshifumi

doi:10.1109/tpwrd.2007.911174

Cited by 25 publications

(16 citation statements)

References 8 publications

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“…Eight given fault resistances Rf (f = 1, ..., 8) are selected and the comparison is shown in Figure 10. Iac/dc_ (1,2,3,4)(Rf) is the fundamental frequency current or DC current calculation result obtained by the expressions for three-phase, two-phase, single-phase, and none-phase circulating states, respectively. …”

Section: Analysis Of Fault Process Under Arbitrary Fault Resistancementioning

confidence: 99%

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Simplified Analytic Approach of Pole-to-Pole Faults in MMC-HVDC for AC System Backup Protection Setting Calculation

Lan

Duan

et al. 2018

Energies

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AC (alternating current) system backup protection setting calculation is an important basis for ensuring the safe operation of power grids. With the increasing integration of modular multilevel converter based high voltage direct current (MMC-HVDC) into power grids, it has been a big challenge for the AC system backup protection setting calculation, as the MMC-HVDC lacks the fault self-clearance capability under pole-to-pole faults. This paper focused on the pole-to-pole faults analysis for the AC system backup protection setting calculation. The principles of pole-to-pole faults analysis were discussed first according to the standard of the AC system protection setting calculation. Then, the influence of fault resistance on the fault process was investigated. A simplified analytic approach of pole-to-pole faults in MMC-HVDC for the AC system backup protection setting calculation was proposed. In the proposed approach, the derived expressions of fundamental frequency current are applicable under arbitrary fault resistance. The accuracy of the proposed approach was demonstrated by PSCAD/EMTDC (Power Systems Computer-Aided Design/Electromagnetic Transients including DC) simulations.

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Section: Analysis Of Fault Process Under Arbitrary Fault Resistancementioning

confidence: 99%

“…The backup protection setting calculation, which has to take protection coordination into consideration, is the most complicated and time-consuming part. Studies on backup protection setting calculation have been maturing with the expansion of AC power grids over the last few decades [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Simplified Analytic Approach of Pole-to-Pole Faults in MMC-HVDC for AC System Backup Protection Setting Calculation

Lan

Duan

et al. 2018

Energies

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“…In this paper, the method proposed in [16] is adopted here to calculate the sensitivity of apparent impedance to the change of electrical parameters, such as bus voltages and bus powers. Based on sensitivity information, a load shedding algorithm is proposed here executed by the CC agent.…”

Section: Sensitivity Based Load Shedding Strategymentioning

confidence: 99%

“…, is the sensitivity of relay operation margin to load power at bus n. So if we assume emergent load shedding on the loads in this paper have the same step size, which is represented by a percentage α (| | < 1), then the amount of LS at this moment will be obtained by (16). Assume that the power flowing into the bus is positive, the shedding amount ∆ is positive, the load powers and α will be negative.…”

Section: Sensitivity Based Load Shedding Strategymentioning

confidence: 99%

“…As for the study of long-term voltage stability, [12] used quasi-steady-state (QSS) time domain simulation to find if the network transmission power reaches the limit which was regarded as the static limit of voltage stability. Dynamic control strategies are also studied with excitation control, tap ratio of the LTC, shunt capacitor banks and load shedding to prevent voltage instability [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Control and protection cooperation strategy for voltage instability

Chen

Liu

2012

2012 47th International Universities Power Engineering Conference (UPEC)

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Abstract--Most cascaded blackouts are caused by unexpected backup relay operations due to low voltage or overload state caused by post fault load restoration dynamics. If such state can be sensed and adjusted appropriately prior to those relay actions, system stability might be sustained. This paper proposed a control and protection cooperation strategy to prevent post fault voltage instability. The multi-agent technology is applied for the strategy implementation; the criteria based on wide area measured apparent impedances are defined to choose the control strategy, such as tap changer adjusting or load shedding; and the sensitivity based load shedding has been adopted to save the system from severe states. A test system is built in real time digital simulator (RTDS) and has demonstrated the effectiveness of the proposed method.Index Terms-apparent impedance, cascaded blackout, cooperation strategy, multi agent, RTDS, unexpected relay operations, voltage instability

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