Wide-range controllable transformer-based dynamic power flow control device provided with bidirectional thyristors

Abstract

The invention discloses a wide-range controllable transformer-based dynamic power flow control device provided with bidirectional thyristors. The wide-range controllable transformer-based dynamic power flow control device provided with the bidirectional thyristors is composed of a controllable transformer, a power unit, a measurement and control module, a cross-phase conversion module, a filtering capacitor, an input and output voltage transformer and an output current transformer. According to the dynamic power flow control method, a power electronic switch enabling rapid turning on and turning off is utilized to control the turning on and turning off of the taps of the input side (primary side) of the wide-range controllable transformer; another two phases of windings are connected in series into each phase of tap of the wide-range controllable transformer; four bidirectional thyristors are additionally adopted, so that the turn-on direction of cross-phase windings can be changed, and therefore, the phase and amplitude of the output voltage of the controllable transformer can be changed in a largest range, and the adjustment of active power and reactive power can be realized; and since the turning on of the taps of the wide-range controllable transformer is controlled, so that adjustment and control on the dynamic power flow of a power grid can be realized. The control device has the advantages of low cost and high reliability of dynamic power flow control.

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 based on a wide-range controllable transformer including bidirectional thyristors and a control method thereof. 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 a...

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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