Utilizing Under Voltage Load Shedding Strategy to Prevent Delayed Voltage Recovery Problem in Korean Power System

  • Received : 2016.08.05
  • Accepted : 2017.08.21
  • Published : 2018.01.01


The presence of induction motor loads in a power system may cause the phenomenon of delayed voltage recovery after the occurrence of a severe fault. A high proportion of induction motor loads in the power system can be a significant influence on the voltage stability of the system. This problem referred to as FIDVR(Fault Induced Delayed Voltage Recovery) is commonly caused by stall of small HVAC unit(Heating, Ventilation, and Air Conditioner) after transmission or distribution system failure. This delayed voltage recovery arises from the dynamic characteristics associated with the kinetic energy of the induction motor load. This paper proposes the UVLS (Under Voltage Load Shedding) control strategy for dealing with FIDVR. UVLS based schemes prevent voltage instability by shedding the load and can help avoid major economic losses due to wide-ranging cascading outages. This paper review recent topic about under voltage load shedding and compare decentralized load shedding scheme with conventional load shedding scheme. The load shedding strategy is applied to an actual system in order to verify the proposed FIDVR mitigation solution. Simulations demonstrate the effectiveness of the proposed method in resolving the problem of delayed voltage recovery in the Korean Power System.

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Fig. 1. Characteristic of Korean power system

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Fig. 2. Voltage variation for ZIP and induction motormodel

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Fig. 3. PMU Installations

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Fig. 4. Centralized scheme procedure

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Fig. 5. Decentralized scheme procedure

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Fig. 6. Not considering induction motor load withoutFIDVR

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Fig. 7. Considering induction motor load with FIDVR

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Fig. 8. Induction motor slip (locked-rotor current)

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Fig. 9. After load shedding (Centralized)

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Fig. 10. After load shedding (Decentralized)

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Fig. 11. Induction motor slip (steady-state motor currentcondition)

Table 1. Review procedure UVLS scheme

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Table 2. Centralized load shedding ― Delay time and amount

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Table 3. Decentralized load shedding ― delay time and amount

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