A three-phase reactive power compensation device without a DC energy storage unit

Abstract

The invention discloses a three-phase reactive power compensation device without a DC energy storage unit, which comprises three identical circuit breakers, three identical compensation units and a filter inductance module. The filter inductance module consists of three star-shaped connected inductors Composition; one end of the first circuit breaker is connected between the a-phase power supply and the a-phase inductive reactive load, the other end is connected to the first compensation unit, and one end of the second circuit breaker is connected to the b-phase power supply and the b-phase inductive reactive load. The other end of the third circuit breaker is connected between the c-phase power supply and the c-phase inductive reactive load, and the other end is connected to the third compensation unit; the other end of the three compensation units One end is respectively connected to the three inductors of the filter inductor module. The invention does not need a DC energy storage unit, and the capacitors used are all AC capacitors. The whole device has high reliability, long service life, easy modular manufacturing and high cost performance.

Description

technical field [0001] The invention relates to a reactive power compensation technology of an electric power system, in particular to a three-phase reactive power compensation device without a DC energy storage unit. Background technique [0002] With the rapid development of the economy, reactive power has become an important physical quantity in the power system. Most network components and loads need to consume reactive power. It is obviously unreasonable for these reactive power to be provided by generators and to achieve long-distance transmission. It is even impossible, and the reasonable method is to set up reactive power compensation devices where reactive power needs to be consumed, and absorb (or send out) reactive power to the grid. [0003] For reactive power compensation devices, the earliest ones are synchronous condensers and fixed capacitor banks (Fixed CapacitorBank, FC). With the development of power electronics technology, the Static VAR Compensator (SVC...

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Problems solved by technology

[0004] The current research on the new static var compensator is based on the step-down AC-AC converter, the research content is single, and in the case of a certain reactive power compensation capacitor, the adjustment range of the reactive power compensation current provided by it is small; The static var compensator of the push-pull forward direct AC-AC converter, but it uses a large number of power switch tubes, which increases the volume of the device, increases the complexity of the control, and is not easy to modularize. Therefore, the new reactive power compensation topology The introduction of reactive power, the expansion of reactive power adjustment range, and the corresponding control technology need to be further studied.

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