UPQC with uninterrupted power source function

Abstract

The invention relates to a UPQC with an uninterrupted power source function, belonging to the electric power equipment technical field, and comprises three super capacitor energy storage modules, three single-phase converter modules and a bidirectional thyristor module. The super capacitor energy storage modules are all in parallel connection with direct current sides of the single-phase converter modules; the AC output terminals of the single-phase converter modules are all parallelly connected between the output terminal of the bidirectional thyristor module, and a load, and are in connection with the load; the input terminal of the bidirectional thyristor module is in connection with a system power supply, and the output terminal of the bidirectional thyristor module is meanwhile directly in connection with the load. The UPQC of the invention enlarges the scope of solving the problem of electric energy quality, reduces cost, is easy to realize high capacity output, and has the characteristics of fast response speed, high standby efficiency, stable operation, and simple structure; in addition, the UPQC effectively reduces product cost, is convenient to maintain and easy to operate, and has higher cost performance.

Description

technical field [0001] The invention relates to a unified power quality regulator with the function of uninterrupted power supply, which belongs to the technical field of power equipment. Background technique [0002] With the improvement of my country's modern industrial technology and people's living standards, power quality problems have become increasingly prominent, and power quality control technology has become the key to solving power quality problems. At present, power quality problems mainly include system power supply voltage transient faults, harmonic pollution, low power factor, three-phase imbalance, etc. The corresponding solutions mainly include dynamic voltage restorer (DVR), active filter (APF), static var compensation generator (SVG), etc., but because these power quality control equipment have single functions, in order to further reduce costs and realize functional integration, unified power quality conditioner (hereinafter referred to as UPQC) has been ...

AI Technical Summary

Problems solved by technology

[0003] However, with the continuous improvement of power quality requirements in modern industrial production, the increasing stability of power grids, and the widespread adoption of multi-circuit line power supply modes, new requirements have been put forward on the transient power quality of system power supply voltages. The requirements include The short-term deep drop and short-term interruption of the system power supply voltage, because the current UPQC is based on the principle of series voltage compensation, its principle is as follows figure 1 As shown, it cannot meet the voltage compensation requirements of short-term deep voltage drops and interruptions. At the same time, UPQC does not have a bidirectional DC-DC conversion function, which makes it difficult to apply to related energy storage devices such as supercapacitors. UPQC does not have soft start function

[0004] Although the uninterruptible power supply can ensure the stable operation of the load when the system power supply is interrupted, the uninterruptible power supply is basically designed according to the long-term interruption of the system power supply, and the cost is relatively high. Governance functions, such as active filtering, reactive power compensation and other functions

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