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access icon openaccess Additional reactive power control and emergency control of the ±1100 kV UHVDC system with a hierarchical connection mode

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 22/08/2018, Accepted 19/09/2018, Published 23/10/2018

This paper proposes an additional reactive power control strategy and an emergency control strategy for ±1100 kV 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.

Inspec keywords: invertors; commutation; power transmission control; probability; power transmission faults; reactive power control; HVDC power transmission; HVDC power convertors

Other keywords: reactive power control strategy; DC voltage analysis; reactive power disturbance suppression; reactive power compensation devices; short-circuit fault; hierarchical connection mode; emergency control strategy; ultrahigh voltage direct current system; inverter station; commutation failure probability; reactive power support; fault-free AC system; UHVDC system

Subjects: AC-DC power convertors (rectifiers); Power and energy control; d.c. transmission; a.c. transmission; DC-AC power convertors (invertors); Power system control; Other topics in statistics; Other topics in statistics; Control of electric power systems

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