Dynamic power flow control device and method of controllable transformer

Abstract

The invention provides a dynamic power flow control device of a controllable transformer. The dynamic power flow control device is composed 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. The dynamic power flow control method comprises the following steps of: controlling the ON and OFF of a subconnector at an input side (original edge) of the controllable transformer by using a quickly powered-on / off electronic power switch; injecting a duple-frequency signal in a pulse-width modulation signal of the electronic power switch of the controllable transformer by using a DC (Direct Current) signal; and changing the phase position and the amplitude of output voltage of the controllable transformer through changing the amplitude of the DC signal in the pulse-width modulation signal as well as the amplitude and the initial phase position of the duple-frequency signal so as to realize the adjustment of active power and reactive power. In the invention, as the conduction of the subconnector of the controllable transformer is controlled, the dynamicpower flow of a power network is adjusted and controlled; and the dynamic power flow control device has the characteristics of low cost and high reliability for the control of dynamic power flow.

Description

technical field [0001] The invention relates to the technical field of flexible power transmission, in particular to a dynamic power flow control device of a controllable transformer and a control method thereof. Background technique [0002] The modern power system is characterized by large units, ultra-high voltage, long distances, and heavy loads. It is a typical strong nonlinear, high-dimensional, and dynamic large system. With the interconnection of large-scale power systems and the use of various new equipment, the scale and complexity of the power system have also increased while making power generation and transmission more economical and efficient, coupled with the widespread use of fast excitation systems and competition in the power market With the introduction of the mechanism, the possibility of the power grid operating on the edge of the stability limit is also greatly increased. Therefore, the flexibility of power grid operation, controllability of power flow...

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Problems solved by technology

[0008] Although the current FACTS technology has many of the above advantages, it 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 FACTS and power equipment and other controllers; the loss of the FACTS device itself is large ; The complex control structure of the FACTS device 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 failure; system stability problems caused by series connection etc. make its application in the power grid very limited

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