Power grid voltage control method for reducing near-zone voltage fluctuation of extra-high-voltage direct-current converter station

Abstract

The invention relates to a power grid voltage control method for reducing near-zone voltage fluctuation of an extra-high-voltage direct-current converter station, and belongs to the technical field ofautomatic voltage control of power systems. According to the method, when each automatic voltage control period arrives, an extra-high voltage direct-current active power transmission plan is read in, and the voltage value of a near-region power grid of a direct-current converter station in a period of time in the future is simulated and calculated according to the active power transmission plan.Active and reactive adjustment of a converter pole is simulated in the calculation process of adopting a power flow model, and a control system in a converter station automatically switches a high-voltage filter / compensation capacitor in the adjustment process, so that voltage values at all moments in the adjustment process are calculated. According to the method, the voltage safety threshold value of the near-zone power grid bus of the converter station is calculated according to the fluctuation amplitude of the voltage value and is input into an automatic voltage control system to realize prevention and control. According to the method, voltage out-of-limit caused by near-zone power grid voltage fluctuation in the converter station direct-current active power transmission capacity adjusting process can be avoided, and the voltage stability of the extra-high voltage direct-current power grid is improved.

Description

technical field [0001] The invention relates to a power grid voltage control method for reducing voltage fluctuations in the vicinity of an UHV DC converter station, and belongs to the technical field of automatic voltage control of electric power systems. Background technique [0002] Automatic voltage control (hereinafter referred to as AVC, Automatic Voltage Control) system is an important means to achieve safe (improved voltage stability margin), economical (reduced network loss), and high-quality (improved voltage qualification rate) operation of the transmission network. The AVC system architecture is based on the grid energy management system (EMS), which can use the real-time operation data of the transmission network to scientifically make the best reactive power and voltage adjustment plan from the perspective of overall optimization of the transmission network, and automatically send it to power plants, substations and subordinates The power grid dispatching organ...

AI Technical Summary

Problems solved by technology

Therefore, if the basic voltage of the converter station is at a high or low level when the active power transmission is adjusted, the voltage fluctuations caused by the switching of the filter / compensation capacitor during the active power adjustment process may cause The voltage exceeds the planned limit and affects the stable operation of the nearby power grid

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