Method and device for treating electric grid harmonic wave

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

Inactive Publication Date: 2007-04-11
张云一
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The above-mentioned various methods have a certain effect on eliminating harmonics, but the cost of the eq

Method used

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  • Method and device for treating electric grid harmonic wave
  • Method and device for treating electric grid harmonic wave
  • Method and device for treating electric grid harmonic wave

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0077] Example 1:

[0078] As shown in Figure 4, the harmonic control transmitter is an embodiment of a harmonic control transformer. XBYQ is a harmonic control transformer. governance resistance.

Example Embodiment

[0079] Example 2:

[0080] 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, Figure 5(b) is the sum of the three-phase voltages formed in parallel; Z is the harmonic control impedance; BHQ is the protector, when the harmonic control converter XBLQ When the voltage at both ends of the output reaches the setting, the protector BHQ is automatically turned on. The first function is to prevent the secondary side of the harmonic control converter XBLQ from being open, and the second is to prevent the voltage at both ends of Z from being too High breakdown equipment, the third is to prevent the high voltage breakdown equipment that will be generated when a large current acts on Z when the power grid is short-circuited.

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Abstract

This invention discloses a method and a device for treating power net harmonics characterizing in utilizing a harmonic signal transmitter to separate sum of harmonic three-phase voltage or current signals to set that a harmonic transmitter secondary circuit formed by the controllable impedance at the secondary side of the transmitter costs harmonic energy, or inverses harmonic signals at the secondary side of the transmitter then feeds back the inverse signal to the system via the harmonic transmitter first side to cancel the harmonic volume of the system.

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] AC harmonics are very harmfu...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 张云一
Owner 张云一
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