Overload compensation method based on railway power quality comprehensive control device

A comprehensive management and power quality technology, applied in the direction of circuit devices, reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems such as load instability, loss of compensation ability, sudden change of current, etc., to avoid grid load increase Large, save energy consumption, increase the effect of stability

Pending Publication Date: 2018-03-23
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0004] However, the load of the railway locomotive is unstable, and a sudden change of current will be generated in the case of starting and emergency braking, and the current sudden change may also occur when the peripheral power equipment is aging.
Existing RPC equipment will immediately start the protection mechanism when the current exceeds the maximum value of its own compensation, thus completely losing the compensation ability, which will cause the unbalanced power supply network to be even more unbalanced, and bring great safety hazards to the upper power supply system

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  • Overload compensation method based on railway power quality comprehensive control device
  • Overload compensation method based on railway power quality comprehensive control device
  • Overload compensation method based on railway power quality comprehensive control device

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Embodiment Construction

[0042] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0043] Such as figure 2 As shown, when the compensation power requirement exceeds the maximum compensation power of the railway power quality comprehensive control device (RPC), the RPC cannot perform complete compensation. Due to the characteristics of RPC parallel compensation, incomplete compensation can be performed at this time, and the compensation output at the maximum power can be performed. , in order to minimize the influence of the locomotive on the upper power supply system.

[0044] Let U A ,U B ,U C After the bus voltage passes through the V / V transformer, the low-v...

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Abstract

The invention relates to an overload compensation method based on a railroad power quality comprehensive control device. The method comprises the steps of calculating a negative sequence unbalance degree according to the running status of a railway power quality comprehensive control device; according to relevant parameter values when the railway power quality comprehensive control device is in afully compensated state, combined with the negative sequence unbalance degree, determining an optimal compensation point; and according to the optimal compensation point, determining an overload compensation value to achieve overload compensation. Compared with the prior art, the method of the invention has the advantages of being able to ensure maximum load compensation when the compensation demand exceeds the compensation capacity and keeping the grid operation stable.

Description

technical field [0001] The invention relates to the control field of railway traction substations, in particular to an overload compensation method based on a comprehensive control device for railway power quality. Background technique [0002] The reliability and safety of power supply in the traction power supply network of electrified railways is an important guarantee for the safe, reliable and economical operation of electric locomotives. As a special electric load, the electric locomotive adopts a single-phase power supply mode, and it will inevitably inject negative sequence current into the upper power system when no compensation measures are taken; since the electric locomotive load is rectified drive and has randomness, at the same time It brings power quality problems such as reactive power, harmonics, and voltage fluctuations, which seriously deteriorates the power quality of the traction power supply network and its superior power system. Among them, the negati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/24H02J3/26H02J3/18
CPCH02J3/00H02J3/18H02J3/24H02J3/26H02J2203/20Y02E40/30Y02E40/50
Inventor 江友华江相伟刘雪莹
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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