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Multifunctional adjuster for quality of voltage in low voltage system

A voltage quality and low-voltage system technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as long-term overvoltage, voltage fluctuations, voltage harmonics, etc., to protect electrical equipment, save electric energy, and Reduced effect

Inactive Publication Date: 2007-08-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a low-voltage system (rated line voltage is a three-phase four-wire system of 380V) multifunctional voltage quality regulator, which is based on insulated gate bipolar transistor (IGBT) devices and pulse width modulation (PWM) control Advanced power electronic devices, which can solve most of the power supply voltage quality problems that have adverse effects on sensitive loads, such as voltage sags, swells, voltage harmonics, voltage fluctuations, long-term overvoltage, undervoltage, etc.

Method used

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  • Multifunctional adjuster for quality of voltage in low voltage system
  • Multifunctional adjuster for quality of voltage in low voltage system
  • Multifunctional adjuster for quality of voltage in low voltage system

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Embodiment Construction

[0023] Multifunctional voltage quality regulator (UVQC) for low-voltage systems, consisting of parallel converter transformers, three-phase full-bridge PWM converters, DC choppers and supercapacitor energy storage systems, single-phase full-bridge PWM converters, series injection The transformer group consists of 5 parts, as shown in Figure 1. The part marked 1 is a parallel converter transformer, see attached drawing 2; the part marked 2 is a three-phase full-bridge PWM converter, see attached drawing 3; the part marked 3 is a DC chopper and a supercapacitor For the energy storage system, see attached drawing 4; the part marked 4 is a single-phase full-bridge PWM converter group, see attached drawing 5; the part marked 5 is a single-phase series injection transformer group, see attached drawing 6, respectively as follows.

[0024] The parallel converter transformer shown in Figure 2 is a three-phase double-winding transformer. The primary and secondary sides are star-shaped ...

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Abstract

The invention belongs to technical area for analyzing and controlling quality of electrical energy. Multifunctional adjuster is composed of converter transformer connected in parallel, full bridge type PWM converter in three phases, DC chopper and super capacitance type energy storage system, group of full bridge type PWM converter in single phase, and group of cascaded feeding transformer. Control functions of dynamic voltage recovery, active filtering, limiting short circuit current and energy saving are realized for devices operated on three phase four wire system at 380V. Advantages are: for issue of under voltage and over voltage possible to appear for long period, the adjuster guarantees that over voltage is limited at rated voltage, load is operated at allowed range of voltage. Thus, energy is saved and wires and electro-devices are protected.

Description

technical field [0001] The invention belongs to the technical field of power quality analysis and control, and in particular provides a multifunctional voltage quality regulator for low-voltage systems. Background technique [0002] With the development of science and technology and the continuous improvement of production automation, digitization, and integration, a large number of sensitive loads related to continuous production processes have higher and higher requirements for power quality. Voltage quality problems, which did not pose a major threat in the past, have directly or indirectly affected the production and economic benefits of these sensitive users. The present invention (multifunctional voltage quality regulator in low-voltage system) can effectively solve the problem of power supply voltage quality, and it has the functions of suppressing voltage harmonics, compensating voltage sags and swells, suppressing voltage fluctuations, limiting load short-circuit cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/01H02J3/28
CPCY02E40/40
Inventor 尹忠东
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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