Control method of railway power regulator

Abstract

Disclosed is a control method of a railway power regulator. The control method comprises the following steps of carrying out voltage stabilization control on a direct-current side voltage by adoptingvariable-parameter PI control, and carrying out tracking control on an alternating-current side compensation current by adopting prediction PR control, so that the precision and rapidity of control are improved, the operation capacity of the RPC is effectively reduced, and the utilization rate of electric energy and the economical efficiency of the compensation device are improved. According to the control method disclosed by the invention, the voltage stabilization control of the direct-current side voltage is carried out by adopting the improved PI control, and compared with the conventionalPI regulation, the regulation time is shortened, the current required control amount can be predicted according to the pre-estimated control amount of the last stage, so that the feedback is more timely, and the steady-state tracking error of the RPC alternating-current side current is reduced, the adjusting time used when the electric energy quality reaches the standard requirement is shortened,no overshoot exists in the adjusting process, the operation capacity of the RPC can be reduced, and the economical efficiency of the device is improved.

Description

technical field [0001] The invention relates to a control method, in particular to a control method for a railway power regulator. Background technique [0002] High-speed railway has the characteristics of large transportation capacity, comfort and convenience, low energy consumption, small environmental impact, energy saving and environmental protection, etc., and has been widely valued and applied in the world. The development of high-speed railway has become the common trend of railway development in the world today. Due to the substantial increase in traction power of high-speed railway traction power supply and single-phase load power supply, a large amount of negative sequence current will be generated, resulting in three-phase imbalance of the public power grid. Therefore, the impact of high-speed railways on the power quality of power systems is mainly the problem of harmonics and negative sequence. Negative-sequence current causes additional loss, heat and additio...

AI Technical Summary

Problems solved by technology

[0005] (1) As a high-power power electronic device, RPC has relatively high operating costs;

[0006] (2) The use of "active + passive" hybrid compensation system can reduce the RPC compensation capacity and reduce costs, but increases the complexity of the system and the difficulty of control

And the passive device itself will increase the current distortion and increase the management burden;

[0007] (3) Traditional control methods are difficult to meet the accuracy and rapidity of the system

For RPC, the DC side voltage is still controlled by PI, and the current is controlled by PR to improve the dynamic performance, but there are still problems such as large overshoot and slow response speed in the DC side voltage transition phase, and there are also steady-state errors in the AC side current.

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