Abstract
When the high-voltage DC (HVDC) system is operated in low-power transmission, the overplus of reactive power provided by AC filters may still exist apart from satisfying the need of the converter station, restricted by the minimum number of filter banks. This will lead to a large number of surplus reactive power into AC system, affecting the safe and stable operation of power grid. Here, the impacts of the adjustment of on-load tap changer of converter transformer and the adjustment of control angle of the converter station on reactive power consumption are analysed. Taking effects on the adjustment of control devices and the interchange of reactive power into account, a static reactive power optimisation model based on the actual control strategy of reactive power in a converter station is set up, which provides theoretical basis for an optimal control during low-power operation. Taking Tian-Guang HVDC project as an example, the simulation results verify its effectiveness of the proposed method.
Highlights
The reactive power compensation and voltage control in converter station are key points for the security and stability of high-voltage DC (HVDC) and ultra-HVDC (UHVDC)
When HVDC system runs during the period of low power, the reactive power provided by AC filters will far greater than that consumed by converter, which leads to considerable interchange of reactive power between the converter station and AC system
If a large amount of reactive power is injected into AC system at this time, the voltage rise of the converter station and nearby grid will aggravate the difficulty of voltage regulation in local area, which brings great impact to the stability of power grid operation, and DC system might be even forced to stop under specific way
Summary
The reactive power compensation and voltage control in converter station are key points for the security and stability of high-voltage DC (HVDC) and ultra-HVDC (UHVDC). The DC converter will consume a large amount of reactive power in the transmission of active power, and the fluctuation of AC voltage occurs due to insufficient or excess reactive power, which might seriously affect the safety of power grid. The load is usually low in power grid, and excess reactive power exists in AC line under light load during this period. If a large amount of reactive power is injected into AC system at this time, the voltage rise of the converter station and nearby grid will aggravate the difficulty of voltage regulation in local area, which brings great impact to the stability of power grid operation, and DC system might be even forced to stop under specific way
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