Dynamic reactive compensating method

Abstract

The invention relates to a dynamic reactive compensation method which is applied to the power system field, in particular to an electrified railway traction substation. The method comprises the following steps: a signal detection device detects voltage and current signals of M phase and T phase in real time; a control device calculates reactive amount of M phase and T phase according to the voltage and current signals measured by the signal detection device in real time; according to the calculated real-time reactive amount, the control device determines the reactive amount that needs compensation, and dynamic switching of each compensation branch of the compensation device is realized by triggering a high voltage high power switching device of each compensation branch. By adopting the invention, the reactive compensation device can carry out real-time dynamic switching with rapid change of the load power factor without action of switch gears. Switching on starts when the voltage passes zero, switching-on inrush current does not occur, and switching off starts when the current passes zero, over-voltage does not occur, thus effectively filtering out harmonic waves in power network and further improving the quality of electric energy.

Description

Technical field [0001] The invention relates to a reactive power compensation method applied in the field of electric power systems, in particular to a dynamic reactive power compensation method applied to electrified railway traction substations. Background technique [0002] In our country, the railway transportation is booming, and the construction of electrified railway is expanding rapidly. Therefore, in order to better meet the needs of sustainable development of traffic volume and speed, solve network voltage drop, improve traction network power supply capacity, suppress grid harmonics, and improve power quality have become urgent technical problems in the railway field in recent years. At present, the reactive power compensation devices commonly used in my country's railway electrical field are mainly two types of traditional reactive power compensation devices. One is a static var compensation device that uses mechanical switches to switch, that is, in the form of ...

AI Technical Summary

Problems solved by technology

However, this kind of reactive power compensation device has a slow response speed and shows a constant impedance characteristic to the fluctuation of the grid voltage. Huge energy storage equipment (such as: capacitance and reactance) to achieve the purpose of reactive power compensation

In addition, this kind of reactive power compensation device can only produce lagging (inductive) reactive power for reactive power adjustment, the adjustment range is very limited, and the cost is high and the land occupation is large.

Images