Reactive current loop given amount calculation method, rectifier control method and system

Abstract

The present invention provides a reactive current loop given quantity calculation method, comprising: obtaining the real-time d-axis component U of the grid side voltage of the three-phase PWM rectifier d ;When the grid side real-time voltage d-axis component U d When the preset conditions are not met and the three-phase PWM rectifier is not fully loaded, the given value I of the reactive current loop q_ref not equal to zero. The present invention controls the given quantity I of the reactive current loop q_ref It is not equal to zero to control the reactive power of the three-phase PWM rectifier to realize the corresponding reactive power compensation, which can replace the special reactive power compensation device, save cost and land occupation, easy to implement, and can generate huge economic benefits.

Description

technical field [0001] The invention relates to the technical field of traction converters for AC electrified railway locomotives, in particular to a reactive current loop given amount calculation method and module, and a three-phase PWM rectifier control method and system. Background technique [0002] Looking back on the history of more than one hundred years and the advantages of three-phase power, the technical problem that the traction power supply system dreams of solving now is: how to realize the three-phase AC traction power supply without increasing the complexity of the traction power supply contact structure, so that the three-phase AC power supply The advantages of this technology are brought into full play in trunk railways and urban rails, increasing power supply capacity (capacity) with the same material, saving materials at the same capacity, and improving material utilization. At the same time, the contact structure does not take up additional space and can ...

AI Technical Summary

Problems solved by technology

[0004] However, when the inductive load of the three-phase traction network is too large, the voltage loss of the three-phase traction network is too large, and the voltage amplitude may be smaller than the lower limit of the normal voltage. On the contrary, when the capacitive load of the three-phase traction network is too large, it will The voltage amplitude of the three-phase traction network increases, and the voltage amplitude may be greater than the upper limit of the normal voltage

The long-term low-voltage or high-voltage operation of the traction network will bring great harm to the safety of the power grid. The system stability is poor, and it cannot withstand the impact of abnormal accidents and strong load changes on the system. It is very easy to cause large-scale power outages and system collapse.

To improve the current situation that the catenary voltage amplitude is too small or too large, we generally add reactive power compensation devices on the catenary line to improve the catenary voltage amplitude by compensating the reactive power on the catenary line. There will be a series of problems such as construction site and cost when upgrading and adding reactive power compensation devices to existing lines

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