Dynamic under-voltage load shedding scheme considering composite load modeling

• Published in: Electric power systems research 2022-01, Vol.202, p.107598, Article 107598
• Main Authors: Arief, Ardiaty, Nappu, Muhammad Bachtiar, Dong, Zhao Yang
• Format: Article
• Language: English
• Subjects: Air conditioning; Composite materials; Dynamic load modeling; Dynamic loads; Dynamic stability; Dynamic voltage curve sensitivity; Electric power systems; Electrical loads; Electricity distribution; Iterative methods; Load shedding; Modelling; Power supply; Sensitivity analysis; Simulation; System dynamics; Systems stability; Transmission lines; Under-voltage load shedding; Voltage collapse; Voltage stability; Voltage stability margin
• ISSN: 0378-7796; 1873-2046
• DOI: 10.1016/j.epsr.2021.107598

•A novel under-voltage load shedding (UVLS) scheme is developed using dynamic voltage stability analysis.•Detailed static and dynamic load modeling are considered, and load compositions are included for a more realistic, reliable, and effective UVLS design.•A new formulation of dynamic voltage active power sensitivity (DVPS) is formulated to determine location and amount of load shedding. This manuscript recommends an under-voltage load shedding scheme based on the sensitivity of dynamic voltage curves to mitigate voltage collapse in highly stressed power systems. The developed method can be used to determine the minimum amount and proper locations of load curtailment by considering power system dynamics including dynamic load modeling. The selected Indonesian regional system has a large number of dynamic loads in form of air conditioning and water pump loads whose dynamics contribute considerably to the complexity of the power system stability. Loss of the transmission line in the system caused by the impact of the composite load after major disturbance is studied. The proposed scheme involves an iterative procedure based on the sensitivity analysis of the dynamic voltage curve to solve the problem of load shedding. Furthermore, this work developed a new index named dynamic voltage-active power sensitivity (DVPS). The DVPS is calculated in all load buses to give information about the bus that has a predominant influence on improving system voltage stability through load shedding. Dynamic simulations are carried out with an Indonesian power system, the South Sulawesi interconnection power system with the proposed load shedding scheme. The results of this work show a noteworthy improvement in the magnitude of the voltage level as well as the voltage stability margin.