Power network harmonic wave management method and device

A harmonic control and harmonic technology, applied to the AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as unbearable for users and expensive equipment, and achieve convenient operation and maintenance, reliable methods, The effect of simple equipment structure

Inactive Publication Date: 2007-10-17
张云一
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The above-mentioned various methods have a certain effect on eliminating harmonics, but the cost of the equipment used is expensive, often tens of millions or even tens of millions, which is unbearable for ordinary users

Method used

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  • Power network harmonic wave management method and device
  • Power network harmonic wave management method and device
  • Power network harmonic wave management method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] As shown in Figure 4, the harmonic control transmitter is an embodiment of a harmonic control transformer. XBYQ is a harmonic control transformer. The primary side is connected to the system, and the three-phase windings on the secondary side are connected in series to form the sum of three-phase voltages. The LC oscillation discharge path of the three-phase symmetrical harmonics on one phase on the side converts the three-phase symmetrical harmonics of the system into three-phase asymmetrical harmonics, and Z is the harmonic control impedance.

Embodiment 2

[0098] As shown in Figure 5, the harmonic control transmitter is an embodiment of a harmonic control converter. XBLQ is a harmonic control converter. and, Figure 5(a) is the sum of the three-phase voltages formed in series, DCXB is the LC oscillation discharge path for the three-phase symmetrical harmonics on one phase of the secondary side of the harmonic transmitter, and the three-phase symmetrical harmonics of the system Converted to three-phase asymmetric harmonics, Figure 5(b) is the sum of the three-phase voltages formed in parallel, DCXB is the LC oscillation discharge path for the three-phase symmetrical harmonics on the primary side of the system, and the three-phase symmetrical harmonics of the system The harmonics are converted into three-phase asymmetrical harmonics; Z is the harmonic control impedance; BHQ is a protector, and when the voltage at both ends of the output of the harmonic control converter XBLQ reaches the set value, the protector BHQ is automatically ...

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Abstract

An electrical network harmonic administration method and equipment, is charactered in that it uses a harmonic transmitter to separate from system a harmonic three-phase voltage or the sum of the three-phase current signal; the secondary side loop of the harmonic transmitter formed by the impedance disposed on the secondary side of the harmonic transmitter, is used to consume the harmonic energy; or the secondary side loop of the harmonic transmitter carry out the phase inversion to the harmonic signals, and then again the phase inversion signal is feedback to the system to counteract the system harmonic quantity through a first side of the harmonic transmitter, and the said harmonic is the three-phase asymmetric harmonic; a symmetrical harmonic release path is disposed in the first phase or second phase of the system, located on first side of the system, or located on the secondary side of the harmonic transmitter, which converts the systema three-phase symmetrical harmonic into a three-phase asymmetric harmonic. The invention method is reliable; has a simple equipment structure; has a convenience of operating and maintenance; and the investment of the invention is only one of or even one of tens of the investment of other harmonics administration methods.

Description

technical field [0001] The invention relates to a method for controlling harmonics in a power grid and equipment for controlling harmonics. Background technique [0002] Harmonic load currents are generated by non-linear loads. Including switch-mode power supplies, ballasts for electronic fluorescent lamps, variable speed drives, uninterruptible power supplies, magnetic core devices, frequency conversion equipment, electric arc furnaces, etc. On the one hand, with the development of the economy, the types and quantities of equipment that generate harmonics have increased sharply; on the other hand, with the popularization and application of sensitive equipment represented by computers, the requirements for the power supply quality of public power grids are getting higher and higher. Many Countries and regions have formulated their own harmonic standards to limit the harmonic pollution of power supply systems and electrical equipment. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 张云一
Owner 张云一
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