Optimization design of non-harmonic detection active power filter of power supply circuit for radar
A power filter, power supply circuit technology, applied in DC circuits to reduce harmonics/ripples, active power filtering, AC networks to reduce harmonics/ripples, etc., can solve the electromagnetic interference of communication equipment, power supply circuit voltage Distortion, DC side voltage fluctuation and other problems, to achieve the effect of improving compensation accuracy, improving output waveform and reducing voltage fluctuation
Pending Publication Date: 2021-10-29
珠海中科慧智科技有限公司
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Problems solved by technology
[0005] 1. When the capacitance is low, the DC side voltage fluctuates greatly, and the voltage of the power supply circuit is distorted, which affects the normal operation of electrical equipment, generates additional transmission loss, reduces the operating efficiency of the system, and increases the operating cost of the system
[0006] 2. The residual harmonics of the DC side voltage cause electromagnetic interference to the communication equipment near the equipment
Method used
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Embodiment
[0042] figure 2 A three-phase active power filter system for a radar power supply circuit involved in this embodiment is given, including: a DC power supply, a three-phase inverter circuit, an APF circuit, a load, and the like. If the grid voltage has no distortion, the grid voltage u a , u b , u c , APF compensation current i ca i cb i cc can be expressed as
[0043]
[0044]
[0045] In the formula, k represents the harmonic order, ω represents the fundamental angular velocity, and θ represents the initial phase angle of the current.
[0046] According to the voltage and current of the active power filter, the instantaneous power p on the AC side can be obtained c As follows, since the filter inductance is generally small, the instantaneous power component of the filter inductance can be ignored.
[0047]
[0048] It can be seen from the above formula that the system has power fluctuations of 6n times frequency, and the power fluctuations are proportional t...
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The invention provides an optimal design of a non-harmonic detection active power filter of a power supply circuit for radar, which mainly comprises the following steps of: comparing main ripple fluctuation power with direct current side instantaneous power according to direct current side power and alternating current side power of a system, and designing a direct current side split capacitance decoupling circuit; introducing closed-loop control, reducing 6-frequency-multiplication fluctuation quantity to 3-frequency-multiplication through 3-frequency-multiplication orthogonal transformation by direct-current side voltage fluctuation quantity, and performing frequency selection by a PR controller to extract a 3-frequency-multiplication component as an inductive current instruction value; filtering the instruction signal through a sliding window average filter, removing residual harmonic waves, and reserving a direct-current component simultaneously; connecting a phase lead link in series behind the sliding window average filter for phase compensation, and obtaining an ideal power grid current waveform. The split capacitance decoupling circuit is introduced to the direct current side, and direct current side capacitance and main voltage ripples are reduced. In addition, residual harmonic waves are eliminated through sliding window average filtering with a phase lead compensation link, the compensation precision is further improved, and the output waveform of the power grid is improved.
Description
technical field [0001] The invention relates to the field of harmonic analysis of power grids, in particular to an optimized design of a harmonic-free detection active power filter for a radar power supply circuit. Background technique [0002] With the development of modern power electronics technology, a large number of nonlinear loads such as power electronic devices are put into industrial production and people's daily life. While people's living standards and quality of life are improved, the problem of power quality in the power grid is becoming more and more serious. The active power filter (APF) is a power electronic device used to dynamically suppress harmonics and compensate reactive power. The compensation of harmonics is flexible and the response speed is fast. It is an important means of effectively controlling harmonics. extensive attention. [0003] At present, the control method of the traditional active power filter can be equivalent to the composite contro...
Claims
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IPC IPC(8): H02J3/01H02J1/02H02J3/24
CPCH02J3/01H02J1/02H02J3/241Y02E40/20
Inventor 唐惠琼胡奋恩
Owner 珠海中科慧智科技有限公司