Power transformer having harmonic suppression function and based on harmonic paraphase principle
A technology of power transformers and transformers, applied to AC networks to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as power quality degradation, impact of electrical equipment, inaccurate indication and measurement of measuring and measuring instruments, etc. , to achieve the effect of weakening the harmonic component and suppressing the harmonic
Inactive Publication Date: 2007-05-23
TSINGHUA UNIV
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Problems solved by technology
Cause damage to equipment such as rotating electrical machines, transformers, transmission lines and power capacitors in the power supply system, affecting their normal operation
[0005] 2. Affect the work and reliability of relay protection and automatic devices
[0006] 3. To make the indication and measurement of measuring and measuring instruments inaccurate
[0007] 4. Interfere with the work of the communication system
[0008] 5. Impact on electrical equipment
Due to the wide use of power electronic devices, it often leads to the decline of power quality in the power grid of a certain voltage level, especially the large harmonic content
Method used
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Embodiment Construction
[0030] In this embodiment, a single-phase transformer with a harmonic suppression function based on the principle of harmonic inversion is taken as an example, and a specific implementation manner is described with reference to the accompanying drawings.
[0031] Figure 1 is a schematic diagram of a harmonic suppression transformer. The harmonic suppression transformer is provided with a harmonic inverting branch composed of inductor L and capacitor C. Using this LC branch, the phase difference between the nth harmonic voltage at both ends of the capacitor and the nth harmonic voltage of the power supply is 180°, where n For the harmonic order of the harmonic voltage that needs to be eliminated, the phase of the nth harmonic in the power supply voltage is inverted, and then the original voltage and the inverted voltage are respectively added to the primary side of the two transformers. Then connect the secondary sides of the two transformers in series, so that the nth harmonic...
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The disclosed power transformer is in use for restraining and weakening influence on load at secondary side from harmonic in primary side. The transformer includes harmonic inverting circuit composed of cascaded inductance and capacitance. Parameters of inductance and capacitance are so selected that phase difference between phases of n order harmonic voltage obtained from voltage division on capacitor and phase of n order harmonic voltage obtained from power source is 180 degrees. Meanwhile, their voltage phases of fundamental wave obtained from said voltage division and from power source are equal basically. Two independent power transformers with same capacity and transformation ratio are adopted in the invention, and each capacity is half of total capacity. First transformer is connected to power source directly, and second transformer through harmonic phase inversion branch is connected to power source. Secondary sides of two transformers are cascaded to provide power for load.
Description
technical field [0001] The present invention relates to a power transformer with harmonic suppression function (abbreviated as harmonic suppression transformer), in particular to a power transformer with harmonic suppression function based on the phase inversion principle. Background technique [0002] In the production, transmission, conversion and use of electric power, there will be some sine wave components whose frequency is an integer multiple of the fundamental frequency (in my country, the industrial power frequency 50Hz is the fundamental frequency), also known as high-order harmonics. . The generation of harmonics mainly comes from the following electrical equipment with nonlinear characteristics: (1) devices with ferromagnetic saturation characteristics, such as transformers, reactors, etc.; (2) arcs with strong nonlinear characteristics as the working medium (3) Switching power supply equipment based on power electronic components, such as: various power conversi...
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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 王善铭王祥珩李隆年杨青谢鹏
Owner TSINGHUA UNIV