Higher harmonic suppression device
A high-order harmonic suppression and harmonic technology, which is applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc. It can solve problems such as affecting power quality, inability to change, and inability to manage harmonics.
Inactive Publication Date: 2015-08-05
SOLVE AIR HEFEI
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] In the power grid, due to the existence of a large number of nonlinear loads, the current waveform of the grid is no longer a sine wave. This non-sinusoidal wave can be decomposed into a DC quantity, the fundamental sine quantity and a series of frequencies as the fundamental wave. The sum of the higher harmonic sine components of integer multiples of the frequency, for the voltage emitted by the current three-phase AC generator set, the fundamental wave is considered to be a sine wave, that is, there is basically no DC and higher harmonic components in the waveform, but due to the power There are various harmonic sources in the system, making the interference of higher harmonics a major "public nuisance" that affects power quality in the current power system
[0003] To suppress the grid harmonics, the traditional measures are: 1. The three-phase rectifier transformer is connected with Yd or Dy, so that the connection can eliminate the higher harmonics of integer multiples of 3, but the harmonic current in the grid is only 5, 7, 11 , 13 and other odd harmonics; 2. Increase the number of phases on the secondary side of the rectifier transformer; 3. Install a shunt filter; 4. Install a static var compensation device. Although the above four suppression methods play a certain role in the purification of the power grid function, but it has great limitations. It cannot fully manage harmonics or only limit them to a small range. These methods are passive and cannot change with harmonic changes.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0008] refer to figure 1 , which includes grid 1, active harmonic regulator 2 and nonlinear load 3, grid 1 is connected to nonlinear load 3 through active harmonic regulator 2.
[0009] Its main working process is: sampling the harmonics generated by the nonlinear load, then analyzing and monitoring, establishing a spectrum diagram, using the spectrum diagram as a basis to send a signal to the converter, and sending a harmonic generated by the nonlinear load to the grid side. The harmonics with opposite harmonics can achieve the purpose of suppressing harmonics. The active harmonic regulator can effectively suppress the 2--25th harmonics, and adjust the phase angle of the voltage and current waveforms according to the actual situation of the power grid. , Correct the current waveform and improve the power factor, thereby effectively suppressing the interference caused by harmonics to the power grid.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
Provided is a higher harmonic suppression device which relates to the technical field of an electric control switch cabinet. The suppression device is characterized in that the suppression device comprises a power grid, an active harmonic regulator and a nonlinear load, wherein the power grid is connected with the nonlinear load through the active harmonic regulator. The higher harmonic suppression device can transmit a harmonic opposite to the harmonic generated by the nonlinear load to the power grid side, so that the effect of harmonic suppression is achieved.
Description
technical field [0001] The invention relates to the technical field of electrical control switch cabinets, in particular to a high-order harmonic suppression device. Background technique [0002] In the power grid, due to the existence of a large number of nonlinear loads, the current waveform of the grid is no longer a sine wave. This non-sinusoidal wave can be decomposed into a DC quantity, the fundamental sine quantity and a series of frequencies as the fundamental wave. The sum of the higher harmonic sine components of integer multiples of the frequency, for the voltage emitted by the current three-phase AC generator set, the fundamental wave is considered to be a sine wave, that is, there is basically no DC and higher harmonic components in the waveform, but due to the power There are all kinds of harmonic sources in the system, making the interference of higher harmonics a major "public nuisance" that affects power quality in the current power system. [0003] To supp...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 不公告发明人
Owner SOLVE AIR HEFEI