Adaptive control mode switching-based UPFC alternating iteration power flow calculation method

Abstract

The invention provides an adaptive control mode switching-based UPFC alternating iteration power flow calculation method, which comprises the steps of: setting a head-end control power value of a series module of a UPFC, voltage phasor initial values of a head-end node i and a tail-end node j of the series module, the voltage phasor initial value of a node of a parallel module and an initial control mode of the series module; solving a UPFC module and an AC network equation; judging whether a power flow exit condition is met or not, and if so, exiting; judging whether to switch the control mode of the series module of the UPFC or not; updating voltage phasors of the head-end node and the tail-end node of the series module of the UPFC, the voltage phasor of the node of the parallel module and the control mode of the series module; and commanding k=k+1 and solving the network equation of the UPFC again. By the method provided by the invention, the problem of power flow calculation of a power system comprising the UPFC is solved; active power and reactive power of the UPFC on line power can be achieved; the control mode of the UPFC is adaptively adjusted; and the alternating iteration convergence is improved while the control precision of the UPFC is ensured.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a UPFC alternate iterative power flow calculation method based on adaptive control mode switching. Background technique [0002] UPFC is the most representative device in the comprehensive flexible AC transmission system (FACTS) equipment. flow control device. The UPFC parallel module can control the node voltage and the injected reactive power of the node; the series terminal can control the active power and reactive power transmitted by the line, and can also control the amplitude and phase angle of the injected voltage. From the perspective of engineering application Generally speaking, it is more intuitive and effective to control the active and reactive power of the line. [0003] The main application field of UPFC is power flow control. After the UPFC device is installed in the system, the power flow calculation method needs to be modified. The existing technology research o...

AI Technical Summary

Problems solved by technology

However, the unified iterative method needs to modify the admittance matrix and Jacobian matrix, and consider various control modes and constraints of UPFC itself, which requires a large modification of the power flow program

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