Dynamic power flow control method for wide-range controllable transformer including bidirectional thyristors

Abstract

The invention discloses a dynamic power flow control device based on a wide-range controllable transformer including bidirectional thyristors. The dynamic power flow control device is formed by a controllable transformer, a power unit, a measuring and controlling module, a cross phase conversion module, a filter capacitor, an input/output voltage transformer and an output current transformer. The dynamic power flow control method is carried out in a way that an electronic power switch which can be turned on/off quickly is employed to control the turn-on/off of a tap joint at the output side (secondary side) of the wide-range controllable transformer, other two phases of windings are connected in series with each phase tap joint of the wide-range controllable transformer, at the same time, four bidirectional thyristors are added to change the conducting direction of the cross phase winding, and therefore the phase and amplitude of the output voltage of the controllable transformer can be changed in a maximum range, and active power and reactive power can be adjusted; because the conduction of the tap joints of the wide-range controllable transformer is controlled, the dynamic power flow of a power network can be adjusted and controlled. The dynamic power flow control method for the wide-range controllable transformer including the bidirectional thyristors is characterized by being low in cost and high in dynamic power flow control reliability.

Description

technical field [0001] The invention relates to the technical field of flexible AC power transmission, in particular to a dynamic power flow control device and a control method of a wide-range controllable transformer based on an output-side switch. Background technique [0002] With the interconnection of large-scale power systems and the use of various new equipment, while making power generation and transmission more economical and efficient, the scale and complexity of the power system have also increased, and the possibility of the power grid operating on the edge of the stability limit has also greatly increased. . At present, my country has reached a new stage of regional power grid interconnection and national unified networking. Large-scale interconnection brings many advantages, but grid operation and stability control will become more complex. The flexibility of grid operation, controllability of power flow and grid stability have become more and more urgent pro...

AI Technical Summary

Problems solved by technology

However, due to the complexity of power system control, the current FACTS technology also has great limitations:

[0007] (1) FACTS device controllers interact with each other, leading to performance deterioration;

[0008] (2) The cost of the project is high, and it is difficult to popularize and apply;

[0009] (3) The loss of itself is relatively large;

[0010] (4) Power system stability problems caused by FACTS device failure

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