Control method of series mixed active power filter having base wave by-pass channel
A power filter and bypass channel technology, applied in active power filtering, AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve the problem of reducing inverter capacity and active power filters without Problems such as being applied in practice and not being realized
Active Publication Date: 2007-04-04
上海南华兰陵电气有限公司
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Problems solved by technology
However, in practical applications, the grid voltage generally has a certain degree of distortion and asymmetry, and it is difficult to ensure that the load current is symmetrical at any time. The "fundamental current" is actually only the fundamental positive sequence current, and the detected "harmonic current" actually contains the fundamental negative sequence current. As a result, the negative sequence current of the grid will be between the PPF1 channel and the inverter Resonant amplification causes a large fundamental wave current of the grid to flow through the inverter
In this way, the main advantage of the active power filter with the fundamental current bypass channel: reducing the capacity of the inverter, it cannot be realized
This is the main reason why this active power filter has not been applied in practice
Method used
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[0023] The technical scheme is described in detail with reference to the accompanying drawings:
[0024] As shown in Fig. 1 and Fig. 2, the series hybrid active power filter with fundamental wave bypass channel involved in the present invention is composed of a passive main circuit, an inverter, a control circuit and the like. The passive main circuit includes a coupling transformer MT, a fundamental bypass channel namely PPF1 channel, and a passive filter bank PPFs. The PPF1 channel is composed of a resonant circuit of an inductor and a capacitor, which provides a low-resistance path for the fundamental current of the power grid. The second-order resonant circuit composed of the inductor L1 and the capacitor C1 is relatively simple and can generally meet the requirements. L1 and C1 are tuned to the power grid fundamental frequency. It is convenient to connect the PPF1 channel in parallel on the side of the coupling transformer connected to the inverter (as shown in Figure 1 ...
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The invention relates to a control method for series compound active electric filter with a base wave by-pass channel, which is used to control the inverter, has no base wave current passing by in the series compound active electric filter in spite of if the electric network and the load are balanced or not, it avoids from the resonance between the base wave by-pass channels and the inverter when it restrains the harmonic wave, thus the capacitance of the inverter and the cost of the machine are decreased, the efficiency of the inverter is upgraded. The technology character lies in: it uses full base wave current detecting method: using positive and reverse rotation double-dp transition base wave current detecting method or using base wave current detecting method based on cascade double-dp transition, or using the base wave current detecting method based on phase-by-phase dp transition, or using the base wave current detecting method based on the phase-by-phase band-pass filter. The technology applies to triphase three-wire system and the triphase four-wire system.
Description
technical field [0001] This patent belongs to power harmonic control technology, and relates to the control of a series hybrid active power filter with a fundamental wave bypass channel. Background technique [0002] Because it can overcome many shortcomings of traditional passive filters, active power filters (APF) have been extensively studied since they were proposed in the 1970s. However, active filters also have a fatal weakness: the cost is too high. This has become a bottleneck in the popularization and application of active power filters. Therefore, the development of active power filters with stable and reliable performance, good compensation effect and low cost is one of the main research directions of active power filters at present. [0003] In 1991, Japanese scholars Toshihiko Tanaka and Hirofumi Akagi proposed a series hybrid active power filter with a fundamental current bypass channel (Toshihiko Tanaka, Hirofumi Akagi, A new combined system of series active...
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IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 吕征宇钟洪浩钱照明
Owner 上海南华兰陵电气有限公司