A Control Method for Active Power Filter Compensation Current Limiting
A power filter, compensation current technology, applied in active power filter, AC network to reduce harmonics/ripples and other directions, can solve problems such as occupation, jeopardizing the operation efficiency and reliability of the power grid system, and reducing the quality of power consumption by users , to achieve good application prospects, fast and accurate current limiting effect, improve reliability and flexibility
Active Publication Date: 2016-01-06
西安西驰电能技术有限公司
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Problems solved by technology
These nonlinear loads will generate a large amount of harmonic current while improving the quality of people's electricity consumption, causing a large amount of distorted current to flow through the power transmission and distribution system, and causing a series of power quality problems, such as occupying additional transmission and distribution equipment and line capacity, causing additional loss and heat, may cause voltage distortion in transmission and distribution networks, and may even induce resonance
On the one hand, the above-mentioned power quality problems seriously endanger the operation efficiency and reliability of the power grid system, and on the other hand, they will reduce the quality of power consumption of users, so they are widely concerned by people.
Compared with other devices, the implementation of the above-mentioned APF current limiting technology is more complicated
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[0030] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0031] like figure 1 and 2 As shown, a current limiting control method for an active power filter compensation current of the present invention includes the following steps:
[0032] 1) Set the desired active power filter compensation current RMS;
[0033] Among them, the desired effective value of the compensation current of the active power filter is set, which is preset according to the capacity of each power device of the active power filter, or the operating temperature of the semiconductor switching device in the active power filter is detected in real time. .
[0034] 2) Detect the distorted load current and calculate the effective value of the harmonic current to be compensated through the harmonic separation algorithm; divide the effective value of the compensation current of the active power filter by the effective value of the harmonic current to be comp...
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The invention discloses a control method for limiting offset current of an active power filter. According to the control method, an additional current limiting link is added on the basis of the traditional control method of the active power filter, the offset current output by the active power filter can be limited accurately and quickly, and control on rated output current of the active power filter can be achieved conveniently. Therefore, the control method has practical engineering application value. The control method for limiting the offset current of the active power filter is implemented based on an effective value of the offset current, and harmonic current compensation effect can be ensured as far as possible under the condition that the active power filter performs maximum power output. Furthermore, the control method adopts an open-loop control part and a closed-loop control part simultaneously, and quick and accurate current limiting effect can be ensured.
Description
【Technical field】 [0001] The invention belongs to the field of research and control of power electronic converters, in particular to a control method for compensating current and limiting current of an active power filter. 【Background technique】 [0002] With the continuous improvement of the degree of automation and precision of people's electrical equipment, a large number of nonlinear loads composed of power electronic devices are connected to the power grid system on a large scale. While improving the quality of people's power consumption, these nonlinear loads will generate a large amount of harmonic current, causing a large amount of distorted current to flow through the transmission and distribution system, and resulting in a series of power quality problems, such as occupying additional transmission and distribution equipment. and line capacity, causing additional loss and heat generation, which may cause voltage distortion in the transmission and distribution networ...
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IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 李昱郎丰杰
Owner 西安西驰电能技术有限公司