Controller for AC electric train

Abstract

In a controller for an AC electric train which can perform powering and regenerating operations and can detect any power failure on AC overhead wires for supplying the AC power, detection of any powerfailure on AC overhead wires is carried out quickly without fail. A power failure detector (14) provided on an electric train controller (8) includes a specific frequency signal arithmetic operationsection (16) which extracts a current component corresponding to a specific frequency setting value (26) from a main transformer output current detection signal (7) to output the extracted signal as aspecific frequency current signal (18), a subtracter (19) which subtracts the main transformer output current detection signal (7) from the specific frequency current signal (18) to output the subtraction result as a current deviation (20), and a power failure detection section (23) which compares the current deviation (20) with a specified power failure detection setting value (22) and outputs apower failure detection signal (15) when the current deviation (20) is greater than the power failure detection setting value (22).

Description

technical field [0001] The present invention relates to a control device for an AC electric vehicle driven by an AC motor, and more particularly to a control device for an AC electric vehicle having a power failure detection function for overhead wires (hereinafter referred to as "AC overhead wires") that supply alternating current. Background technique [0002] In the control device of an AC electric vehicle according to the prior art, first, for a current signal of a certain frequency component applied from a substation to an AC overhead line, the detector on the input side of the main transformer is used to detect the presence or absence of overlap in the substation. specific frequency components. Then, a current signal of a certain frequency component detected by the detector cannot be detected due to the opening of the circuit breaker of the power feeding system, etc., and power outage detection is performed (for example, refer to Patent Document 1). [0003] Patent Do...

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Problems solved by technology

[0006] On the other hand, in this conventional method, it is also possible to change the power failure detection setting value and set it to a value that reduces the probability of false detection. However, in this case, there is a problem that The detection of power outages is delayed, and depending on the conditions, excessive current may flow through ground equipment such as substations, which may cause equipment failure.

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