Auxiliary decision-making calculation method for eliminating overload of near-zone equipment of unified power flower controller (UPFC)

Abstract

The invention discloses an auxiliary decision-making calculation method for eliminating overload of near-zone equipment of a unified power flower controller (UPFC). A UPFC module and a network equation are alternatively iterated by power flow calculation on UPFC power flow control, an active power flow setting value of a series connection end of the UPFC is automatically adjusted according to a relative relation between control adjustment of active power flow of the series connection end in iteration and overload quantity of a controlled component when a controlled voltage source of the seriesend is not limited, the UPFC power flow is finally controlled within an adjustable range, and the static unsafety of the near-zone equipment of the UPFC is eliminated. By the auxiliary decision-making calculation method, a control strategy of the UPFC can be rapidly calculated on the premise that the effectiveness of eliminating the overload of the controlled component by UPFC power flow controlis ensured, the problem that an injection quantity perturbation method used for calculation of traditional static safety auxiliary decision making is not suitable for a strong non-linear controlled component such as the UPFC is solved, direct perturbation of a UPFC control target is also prevented, and the power flow calculation is short in time.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a UPFC power flow control calculation method for eliminating overload of UPFC near-area equipment. Background technique [0002] UPFC is composed of static var compensator for parallel compensation and static synchronous series compensator for series compensation. It is a power flow control device in comprehensive flexible AC transmission system equipment. Considering UPFC's power flow control calculation method in engineering applications, UPFC is usually equivalent to node power injection, and the network equation and UPFC solution are separated, so that it is convenient to consider UPFC's various control mode switching and control variable constraints in the calculation . [0003] At present, my country has put into operation UPFC power flow control projects of 220kV in Nanjing and 500kV in southern Jiangsu. The main function is to solve the overload problem of nearby lines throu...

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Problems solved by technology

However, the sensitivity of control measures to static unsafe components is based on the perturbation of injection volume, which describes the linear relationship between the variables of the power flow equation, and is not suitable for strongly nonlinear controlled components, such as UPFC. Simple perturbations cannot be calculated. And UPFC's own constraints, the validity of the calculation results cannot be guaranteed, and if the UPFC control target is directly perturbed, multiple detailed power flow calculations will take a long time

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