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Single-tuned filter and optimal quality factor calculation method thereof

A technology of quality factor and calculation method, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, reactive power adjustment/elimination/compensation, etc. Ensure system stability and ensure the effect of filtering effects

Inactive Publication Date: 2014-01-01
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0002] The first-order single-tuned filter in the power system is widely used due to its advantages of small loss, good single-order harmonic filtering effect, and small short-circuit current, and the filter quality factor plays an important role in the filtering effect of the single-tuned filter. Currently, designers Most rely on engineering experience to select the filter quality factor, which cannot achieve the best filtering effect and ensure the stable operation of the system under extreme conditions

Method used

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  • Single-tuned filter and optimal quality factor calculation method thereof
  • Single-tuned filter and optimal quality factor calculation method thereof
  • Single-tuned filter and optimal quality factor calculation method thereof

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Embodiment Construction

[0030] The method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments of the present invention.

[0031] figure 1 It is a structural schematic diagram of a single-tuned filter of the present invention, such as figure 1 As shown, the single tuned filter is mainly composed of a capacitor C, an inductor L and a resistor R connected in series in sequence. The realization method of the optimal figure of merit of the single-tuned filter mainly comprises the following steps:

[0032] Step 1: Calculate the maximum equivalent frequency offset of the system .

[0033] According to the circuit principle, the impedance of the single-tuned filter The expression is:

[0034] (1)

[0035] in: is the fundamental frequency ( ); for subharmonic frequency.

[0036] When the power system is actually running, the voltage frequency with rated frequency There is always a certain deviation betw...

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Abstract

The invention discloses a single-tuned filter and an optimal quality factor calculation method thereof. The single-tuned filter mainly comprises a capacitor C, an inductor L and a resistor R which are sequentially connected in series, wherein the other end of the capacitor C is connected with an alternating current voltage line; and the other end of the resistor R is grounded. The method comprises the following steps of: A, calculating the maximum equivalent frequency offset of a system; B, determining a maximum impedance angle of the system; and C, calculating an optimal quality factor of the filter. By the single-tuned filter and the method, the terminal voltage of the filter can be ensured to have a minimum value at characteristic frequency when the system has the maximum impedance angle, so filtering effects and system stability are ensured.

Description

technical field [0001] The invention relates to reactive power compensation and harmonic control technology in the electric power industry, in particular to a single-tuned filter and a calculation method for its optimal quality factor. Background technique [0002] The first-order single-tuned filter in the power system is widely used due to its advantages of small loss, good single-order harmonic filtering effect, and small short-circuit current, and the filter quality factor plays an important role in the filtering effect of the single-tuned filter. Currently, designers Relying on engineering experience to select the quality factor of the filter cannot achieve the best filtering effect and ensure the stable operation of the system under extreme conditions. Contents of the invention [0003] In view of this, the main purpose of the present invention is to provide a single-tuned filter and its optimal quality factor calculation method, using derivation filter impedance and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/30Y02E40/40
Inventor 张华军蔡炜
Owner STATE GRID CORP OF CHINA
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