A real-time calculation method of resonance point based on apf device
A technology of real-time calculation and resonance point, which is applied to the AC network to reduce harmonics/ripples, active power filtering, etc., and can solve problems such as constraints on the 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: 2021-06-29
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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[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 circuit, L is the inductance value of the resonance circuit, and C is the capacitance value of the resonance circuit.
[0028] Step 2: Repeat step 1 to obtain the phase difference between the voltage and current of another harmonic signal;
[0029] Step 3: Establish the corresponding relationship equations of the resistance value, capacitance value, inductance value, the phase difference obtained in the abo...
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The invention discloses a real-time calculation method of a resonance point based on an APF device, comprising the following steps: APF sends a harmonic current signal not included in the power grid for 2s, simultaneously collects a corresponding harmonic voltage signal, detects and records the difference between the voltage and the current signal Repeat the previous step to obtain the phase difference between the voltage and current of another harmonic signal; establish the resistance value, capacitance value, inductance value in the parallel resonant circuit, the phase difference obtained from the above steps and the angular frequency of the transmitted harmonic current The corresponding relationship equations, compare the two equations and then simplify and solve to obtain the product value of LC, and then obtain the resonant frequency of the parallel resonant circuit. The invention realizes the calculation of the resonant frequency of the parallel resonant circuit according to the voltage and current phase difference data of the harmonic signal sent by the APF. The harmonic signal sent during work causes the circuit to resonate, which has strong 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