Transformer type adjustable reactor and static reactive compensator compose of it

Abstract

This invention relates to a transformer type adjustable reactance, and the static reactive compensator made thereof. The reactance comprises: a parallet transformer unit, voltage source type inverter combniation unit and an adjustable reactance combination unit. Above-said inverter combination unit involves a double arm inverter power source series connected with current-limiting reactance. Adjustable reactane combniation unit involves (N-1) pieces of crystal valve tube throw-over reactance branches, each of which being parallel connection respectively antiparallet connection crystal valve tube T(i1) and a reactance X(i1). The compensator composed by above-said reactance comprises also: a fixed parallet capacitor unit, testing unit and a control unit. Advantages are: no need of special fitler, large capacity, low harmonic wave pollution, quick dynamic response.

Description

technical field [0001] The invention belongs to the field of power system automation, and in particular relates to a transformer-type adjustable reactor and a static var compensator formed therefrom. Background technique [0002] The safety, stability and economic operation level of the power system are closely related to the reactive power balance. For this reason, it is necessary to install corresponding compensation devices to solve the problems of reactive power shortage and reactive power surplus that may occur in different operating modes of the power system. To sum up, the reactive power compensators currently being applied and researched are as follows: [0003] Static Var Compensator (Static Var Compensator, SVC): In this type of compensator, currently researched and used more is the SVC based on Thyristor Controlled Reactor (TCR), which can better solve the load However, a large amount of harmonic current will be injected into the system during the TCR workin...

AI Technical Summary

Problems solved by technology

However, CSRT has the following disadvantages: ① In order to reduce the harmonic distortion rate of the injected system current at light load, there is an unadjustable dead zone; ② In order to meet the harmonic limit of the reactor output current in the working area, the capacity of each level of the winding is controlled and the number of adjustment stages must satisfy a certain relationship, which makes the design and realization of the device complicated

However, limited to the production and development level of power electronic devices, there are still problems such as high technical difficulty and high cost in the manufacture of large-capacity ASVG.

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