Harmonic current fractional frequency staggered compensation device and harmonic current fractional frequency giving algorithm thereof
A harmonic current and compensation device technology, applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as reduced compensation performance, large loss, and impact on filtering performance, and achieves reduced switching losses, Compensate for improved performance and improved efficiency
Inactive Publication Date: 2014-06-18
INNER MONGOLIA UNIV FOR THE NATITIES
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Problems solved by technology
PF has low cost, mature technology, and can also compensate reactive power, but there are some problems such as filtering only for specific harmonics, filter parameters affecting filtering performance, series-parallel resonance, and poor filtering effect for loads with frequently
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[0021] The structure diagram of this device used for harmonic control of three-phase rectifier bridge and resistive load is as follows figure 2 As shown, the power supply is a 50Hz three-phase 380V alternating current, and the load is a nonlinear load composed of a three-phase diode rectifier bridge and a resistive load. The resistance and inductance are 26Ω and 10mH respectively. The harmonic control device is composed of a phase-locked loop (PLL) module, a current and voltage sensor, a reference current divider given module, a current tracking control algorithm module, a PWM & drive current module and a dual inverter unit main circuit. The PLL module takes 74HC4046 as the core, plus a cumulative counter CD4040 and low-pass filter. Reference current frequency division given module such as image 3 As shown, It is to compensate the low-frequency component of the reference current, which is mainly composed of the reactive current, the 5th, 7th and 11th harmonic current obtained ...
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The invention discloses a harmonic current fractional frequency staggered compensation device and a harmonic current fractional frequency giving algorithm thereof. An active part of a main circuit of the device consists of a low-switching-frequency high-power inverter circuit unit and a high-switching-frequency low-power inverter circuit unit, wherein the low-switching-frequency high-power inverter circuit unit and the high-switching-frequency low-power inverter circuit unit are respectively responsible for generating low-frequency components and high-frequency components in harmonic reference current. The two inverter circuit units of the harmonic current compensation device share the same direct-current bus capacitor Cdc, and alternating-current sides of the two inverter circuit units are respectively and serially connected with a seventh serial harmonic branch circuit and a thirteenth serial harmonic branch circuit, then are connected with a filter capacitor and finally are connected to a power grid. A passive part formed by the serial harmonic branch circuits greatly reduces the power level of the active part. The separate giving of the reference current low-frequency components and high-frequency components is realized by adopting the harmonic current fractional frequency giving algorithm based on sliding DFT (Discrete Fourier Transform). The device effectively solves the contradictory constraint relationship among the active part components, the efficiency, the switching frequency and the compensation performance of the harmonic compensation device.
Description
technical field [0001] The invention relates to a harmonic compensation device and its harmonic current division frequency given algorithm, in particular to a high-performance and high-efficiency harmonic compensation device capable of dividing each component of harmonic current and reactive current into two groups according to frequency and performing compensation separately. wave compensation device. Background technique [0002] Medium and high voltage nonlinear loads generate a large amount of harmonic current during operation, which will bring serious power quality problems to the power grid where they are located. These problems are concentrated in the distortion and asymmetry of the load current, and the excessive distortion current will even cause the distortion of the access point voltage, and will also cause the rated operating point of other equipment to shift seriously, and the relay protection will malfunction, seriously Threats to the safe and stable operation...
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Login to view more IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 韩伟周立丽
Owner INNER MONGOLIA UNIV FOR THE NATITIES
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