Method for reducing overshooting voltage in active filter

A technology of source filter and overshoot, which is applied to the AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as large voltage overshoot, capacitor voltage fluctuations, power device threats, etc., to achieve Ensure normal operation and reduce the effect of overshoot voltage

Inactive Publication Date: 2011-04-13
GUANGDONG YADA ELECTRONICS
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Problems solved by technology

After the pre-charging is completed, the main circuit is put into operation. If a relatively large command current is sent to the current tracking control circuit at this time, the main circuit will go through a transient process. In the transient process, the voltage overshoot is relatively small Large, it will cause large fluctuations in the capacitor voltage, which poses a threat to power devices

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  • Method for reducing overshooting voltage in active filter
  • Method for reducing overshooting voltage in active filter
  • Method for reducing overshooting voltage in active filter

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Embodiment Construction

[0013] A method for reducing the overshoot voltage in an active filter adopts a bell mouth charging method during the secondary charging process of an energy storage capacitor in the active filter from an active filter operating voltage of 540v to 800v.

[0014] like figure 1 As shown, after the shutdown signal arrives, the command current is set to zero. After the DSP receives the start signal, it adopts a 20s soft-start bell mouth strategy for the command current sent out, that is, after the actual command current is calculated, multiply it by a value greater than zero and less than The coefficient of 1, the coefficient is increased by 1 / 1000, the start counter is increased by 1, and then sent to the current tracking control circuit, this coefficient gradually increases from 0 to 1 within 20s, so that the command current gradually increases. When the counter reaches 1000, set the start and end flag, and send the command current value of APFR to D / A through the wellhead. ...

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Abstract

The invention discloses a method for reducing overshooting voltage in an active filter, which is characterized in that a horn mouth charging mode is used in the secondary charging process of a storage capacitor in an active filter from the operating voltage (540v) of the active filter to 800v, wherein the horn mouth charging mode comprises the following steps: after receiving a starting signal, a DSP (digital signal processor) implements a 20s soft-startup horn mouth strategy on the sent command current, i.e. after the actual command current is calculated, the current is multiplied by a coefficient which is more than zero and less than 1 and is then sent to a current tracking control circuit, wherein the coefficient gradually increases from zero to one within 20 seconds, so that the command current is also gradually increased. By using the horn mouth charging mode, the method disclosed in the invention greatly reduces the overshooting voltage in the active filter, thereby ensuring the normal operation of the active filter.

Description

technical field [0001] The invention relates to a voltage starting control method of an active power filter, in particular to a method for reducing the overshoot voltage in the active power filter. Background technique [0002] Active power filter is a new type of special equipment for power harmonic control made of modern power electronics technology and digital signal processing technology based on high-speed DSP devices. It is composed of two main parts: command current operation circuit and compensation current generation circuit. The command current operation circuit monitors the current in the line in real time, converts the analog current signal into a digital signal, and sends it to a high-speed digital signal processor (DSP) to process the signal, separates the harmonic from the fundamental wave, and modulates the signal with pulse width ( PWM) signal form sends drive pulses to the compensation current generation circuit, drives the IGBT or IPM power module, genera...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 汤晓宇张静
Owner GUANGDONG YADA ELECTRONICS
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