Single-phase module combined active power filter for tractive power supply

Abstract

The invention discloses a single-phase module combined active power filter for tractive power supply, which belongs to the technical field of power quality and multilevel. A two-phase alternating current connecting terminal of a first power unit (U1) is respectively and serially connected with n third power units (U3) in sequence to form a two-phase upper bridge arm, a two-phase alternating current connecting terminal of a second power unit (U2) is respectively serially connected with n fourth power units (U4) in sequence to form a two-phase lower bridge arm, the two-phase upper bridge arm isserially connected with the two-phase lower bridge arm through two reactors, a two-phase alternating current output terminal is arranged at the connecting point between the two reactors, and n is a positive integer. The alternating current output terminal of the active power filter is directly connected with positive and negative feeders of a tractive power supply network and the purpose that thetractive power supply system directly runs in the network without an industrial frequency transformer can be realized. The single-phase module combined active power filter for the tractive power supply can be used by being connected with the active power filter and other devices in series and parallel to form a hybrid compensation system, and the concrete combining form is determined according tothe filter and the reactive performance indexes.

Description

Single-phase module combined active power filter for traction power supply technical field The invention relates to a power quality compensation device, in particular to a single-phase module combined active power filter for traction power supply. Background technique Electric locomotive is a single-phase nonlinear large-capacity load with strong volatility and randomness. When connected to a three-phase symmetrical power system through a traction transformer, a large amount of negative sequence current, harmonic current and The reactive component affects the power quality of the traction power supply system. One of the current research focus issues is the harmonic problem. Although the harmonics generated by electric locomotives can be reduced by improving the new models put into use in the future, and the power factor is approximately 1, it is almost impossible to completely transform the large number of electric locomotives currently in operation in my country. Therefo...

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Problems solved by technology

The technical problem to be solved by the present invention is to solve the limitations of traditional active power filters in the high-voltage field, and propose a single-phase module combined active power filter for traction power supply that does not need a power frequency transformer to be directly connected to the grid. device

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