Harmonic wave counteracting apparatus
A harmonic and regulator technology, applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as inability to manage harmonics, affect power quality, and increase the number of phases on the secondary side of rectifier transformers.
Inactive Publication Date: 2016-11-09
HEFEI JINTONGWEI LOW TEMPERATURE TECH CO LTD
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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.
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[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.
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The invention discloses a harmonic wave counteracting apparatus, and relates to the technical field of an electrical control switch cabinet. The harmonic wave counteracting apparatus is characterized by comprising a power grid, an active harmonic wave regulator and a nonlinear load, wherein the power grid is connected with the nonlinear load through the active harmonic wave regulator. Harmonic wave which is opposite to the harmonic wave generated by the nonlinear load can be transmitted to the power grid, so that an effect of harmonic wave suppression can be achieved consequently.
Description
technical field [0001] The invention relates to the technical field of electric control switch cabinets, in particular to a harmonic wave offset 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 suppress the grid...
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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 武行峰
Owner HEFEI JINTONGWEI LOW TEMPERATURE TECH CO LTD