Resonance point real-time calculation method based on APF device
A real-time calculation and resonance point technology, applied in the AC network to reduce harmonics/ripples, active power filtering, etc., can solve problems such as constraints on the working performance of APF devices, grid voltage distortion, and large resonance currents, and achieve accuracy High, small amount of calculation, avoiding the effect of circuit resonance
Active Publication Date: 2021-01-12
QINGDAO TOPSCOMM COMM
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Problems solved by technology
[0003] If the compensation frequency of the active power filter device is near the load resonance frequency on the user side, the grid voltage will be distorted, and a large resonance current will be generated on the user side and the grid, causing damage to the equipment
Therefore, the APF should first detect the resonance point of the user-side load before working, but the existing resonance point calculation method can only obtain the frequency range value of the resonance point, and needs to send and collect a large amount of harmonic data, which limits the The working performance of the APF device, so in-depth study of the calculation method of the resonance point has important practical significance
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[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0022] Example.
[0023] Such as figure 1 As shown, a method for real-time calculation of the resonance point based on the APF device comprises the following steps:
[0024] Step 1: The APF device sends the harmonic current signal not included in the power grid for 2s, and collects the corresponding harmonic voltage signal at the same time, detects and records the phase difference between the voltage and current signal;
[0025] phase difference
[0026]
[0027] Among them, ω is the angular frequency of the transmitted harmonic current signal, R is the resistance value of the resonance circu...
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The invention discloses a resonance point real-time calculation method based on an APF device, and the method comprises the following steps: an APF transmitting a 2s harmonic current signal which is not included in a power grid, collecting a corresponding harmonic voltage signal, and detecting and recording the phase difference between a voltage signal and a current signal; repeating the previousstep to obtain the phase difference between the voltage and the current of the other harmonic signal; and establishing a corresponding relation equation set of a resistance value, a capacitance value,an inductance value, the phase difference obtained in the previous steps and the angular frequency of the sent harmonic current in the parallel resonance circuit, comparing the two equations, simplifying and solving to obtain a product value of LC, and further solving the resonance frequency of the parallel resonance circuit. The resonant frequency of the parallel resonant circuit is calculated according to the voltage and current phase difference data of the harmonic signal sent by the APF, the calculation amount is small, the accuracy is high, real-time detection of the resonant frequency of the circuit behind the APF is achieved, the situation that circuit resonance is caused by the harmonic signal sent by the APF during work is avoided, and the method has very high engineering practicability.
Description
technical field [0001] The invention relates to the technical field of resonance point calculation, in particular to a method for real-time calculation of resonance point based on an APF device. Background technique [0002] With the vigorous development of the energy-saving industry, various energy-saving devices based on power electronic technology are widely used in power grid equipment, followed by harmonic pollution caused by more and more nonlinear loads in the power grid, which damages the power grid equipment. Harmonic control devices are generally installed on the user side where harmonics are generated. Currently, commonly used devices are divided into static reactive power compensation devices (SVC), passive power filter devices (PF / FC) and active power filter devices (APF ) three types, among which the structure of the active filter APF is simple, the compensation characteristics are not affected by the grid impedance, and can compensate multiple harmonic current...
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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 范建华曹乾磊尹怀强李保安
Owner QINGDAO TOPSCOMM COMM