Output-side-switching-based dynamic power flow control device and control method for controllable transformer

Abstract

The invention discloses an output-side-switching-based dynamic power flow control device for a controllable transformer. The device consists of the controllable transformer, a power unit, a measurement and control module, a bypass switch, an input voltage transformer, an output voltage transformer and an output current transformer. In a dynamic power flow control method, the switching-on and switching-off of an output side / secondary tapping point of the controllable transformer are controlled by utilizing a fast switching-on / off power electronic switch, a frequency doubling signal is injectedinto a pulse width modulation signal of the power electronic switch of the controllable transformer by adopting a direct current signal, and the amplitude of the direct current signal and the amplitude and initial phase of the frequency doubling signal in the pulse width modulation signal are changed, thereby changing the phase and amplitude of output voltage of the controllable transformer and realize active power adjustment and passive power adjustment. The switching-on of the tapping point of the controllable transformer is controlled, thereby realizing adjustment control over the dynamic power flow of a power grid. The device and the method have the characteristics of low cost and high dynamic power flow control reliability.

Description

technical field [0001] The invention relates to the technical field of flexible power transmission, in particular to a dynamic power flow control device and a control method of a 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. . Therefore, the flexibility of power grid operation, controllability of power flow and stability of power grid have become more and more urgent problems to be solved. [0003] Therefore, the demand generated by the operating pressure of the transmission system in the 21st century can be summarized into the following three aspects: [0004] (1) Increase power transmission...

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Problems solved by technology

[0008] However, the current FACTS technology also has great limitations: the cost of the FACTS device is high, and it is difficult to popularize and apply; there are adverse effects between the FACTS device and power equipment and other controllers; the loss of the FACTS device itself is large; The control structure and the requirements for corresponding auxiliary equipment such as communication facilities put forward stricter requirements for the operation and control of the power grid; additional problems caused by device failures; system stability problems caused by series connection, etc. The application in the grid is greatly restricted

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