Timing sequence optimization control method for distributed power flow controller, and controller

Abstract

The invention discloses a timing sequence optimization control method for a distributed power flow controller, and the controller, wherein a DPFC (deviation of power frequency component) device is connected into a single-machine infinite bus system, and the both ends of the single-machine infinite bus system are connected with a Y-Delta-type transformer; the DPFC device is used for switching current converters at the series side of the DPFC device in different time periods, and the number of the current converters switched in each time period is calculated according to a corresponding formula. According to the timing sequence optimization control method disclosed by the invention, the active power flow of an electric transmission line is adjusted in real time by controlling the switching time of the single-phase current converters at the series side of the DPFC device; simultaneously, the reduction of the active power of the electric transmission line during the charging energy storage process of direct-current capacitors at the series side of the DPFC device is prevented, the total harmonic distortion of a line current caused by the plurality of single-phase current converters is avoided, and the reactive compensation performance of the DPFC device is optimized.

Description

technical field [0001] The present invention relates to a distributed power flow controller, in particular to a timing optimization control method and controller of a distributed power flow controller. Background technique [0002] One of the main characteristics of modern power grids is the use of grid interconnection, which will form an increasingly larger giant power system, which on the one hand lays the foundation for long-distance energy transmission and improves the reliability of power supply; Optimal allocation of resources and economies of scale. In power networks, power flow control is gradually becoming a key factor in the development of power systems. Much of this development trend is attributed to the rapidly growing electrical energy consumption and the complexity of electricity market development. As a result, the power sector now requires a new technology to increase the transmission capacity of existing power transmission systems. Under the year-by-year ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the prior art, when the series-side converters of the distributed power flow controller are put into system operation at the same time, the performance of the transmission line will be greatly affected, such as line harmonic distortion, active power drop, etc., The defect that makes the stability of the system decrease, provides a time sequence optimization control method and controller of a distributed power flow controller that can improve the operation stability and reliability of the system and optimize the control of the system performance

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