Control method of active power filler

A source filter and control method technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, AC network circuits, etc., can solve problems such as the influence of control effects, and achieve the goal of improving compensation accuracy and dynamic performance Effect

Active Publication Date: 2017-02-22
YANGZHOU POWER SUPPLY CO OF STATE GRID JIANGSU ELECTRIC POWER CO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the inherent sampling delay in the digital c...

Method used

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  • Control method of active power filler
  • Control method of active power filler
  • Control method of active power filler

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Embodiment Construction

[0018] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] The purpose of the present invention is to provide an APF control method to improve the inherent sampling delay problem of the digital control system, thereby improving the compensation performance of the active filter.

[0020] System structure such as figure 1 As shown, the APF is connected to the load through the connection reactor. Among them, R and L are the equivalent resistance and inductance of the connected reactor, U a , U b , U c is the three-phase voltage output by the APF. u sa , U sb , U sc is the three-phase voltage at the connection point of the APF to the system.

[0021] The specific steps are:

[0022] Step 1), transform the harmonic current of the load and the output current of the active filter through park transformation, and the generated dq component is used as the input of the controller, wherein the ...

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Abstract

The invention discloses a control method of an APF (active power filler) and particularly relates to an APF output current and instruction current prediction method. The method includes: instruction current and APF output current are substituted into a passive control law through one-beat prediction; a passive controller generates modulated waves through operation, and pulse signals for controlling an APF switching tube are generated after PWM (pulse width modulation); prediction of the instruction current is realized through one-order linear interpolation, and a prediction value of the APF output current at a next sampling moment is obtained by means of Kalman optimal prediction based on an APF discrete mathematical model. By prediction of the instruction current and the APF output current, intrinsic sampling delay of a digital system can be offset, and compensation performance of the active power filler is improved.

Description

technical field [0001] The invention relates to a control method of an APF (active filter), in particular to a prediction method of the APF output current and command current. Background technique [0002] Active filter (APF) as a means of harmonic control has attracted more and more people's attention and application. Its structure is as follows: figure 1 shown in . The control method of APF is an important factor affecting its compensation performance and effect, and real-time and dynamic performance are important indicators to measure the control effect of the controller. However, due to the inherent sampling delay in the digital control system, it will have a certain impact on the control effect. [0003] Therefore, the Kalman optimal prediction is used to predict the compensation current, and the first-order linear interpolation method is used to predict the compensation command current, which can compensate the sampling delay of the digital control system and improve...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01H02J2203/20Y02E40/40
Inventor 丁俊曹俊杰韦斌
Owner YANGZHOU POWER SUPPLY CO OF STATE GRID JIANGSU ELECTRIC POWER CO
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