Journal
JOURNAL OF ENGINEERING-JOE
Volume -, Issue 16, Pages 1523-1527Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/joe.2018.8437
Keywords
invertors; power transmission faults; reactive power control; HVDC power transmission; HVDC power convertors; power transmission control; commutation; probability; commutation failure probability; reactive power disturbance suppression; fault-free AC system; short-circuit fault; DC voltage analysis; inverter station; ultrahigh voltage direct current system; UHVDC system; emergency control strategy; reactive power control strategy; reactive power support; reactive power compensation devices; hierarchical connection mode
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Funding
- National Key Research and Development Program of China [2016YFB0900800]
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This paper proposes an additional reactive power control strategy and an emergency control strategy for +/- 1100kV ultra-high voltage direct current (UHVDC) system with a hierarchical connection mode, in which the inverter station connect to two AC systems with different voltage levels. Firstly, the relationship between reactive power and DC voltage is analysed. Then, an additional reactive power control strategy is proposed to solve the voltage fluctuation caused by reactive power disturbance. Next, the reactive power emergency control strategy is proposed when a short-circuit fault occurs. Reactive power compensation devices will be inputted into the fault-free AC system to provide reactive power support through coupling relationship between two AC systems in the inverter side. Simulation results show that the additional reactive power control strategy can suppress reactive power disturbances without affecting the active power. Moreover, the reactive power emergency control strategy can reduce the probability of commutation failure in converters connected to the fault AC system while a short-circuit fault occurs.
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