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Control system of APF (active power filter)

A power filter and control system technology, which is applied in active power filtering, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc., and can solve problems such as resonance and large influence of passive filter device system parameters , to avoid misoperation, increase anti-interference ability, and realize the effect of communication and management

Inactive Publication Date: 2014-02-12
SHANDONG BLUE POWER TECH
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Problems solved by technology

[0003] Based on the above situation and the characteristics of the passive filter device are greatly affected by the system parameters, it can only eliminate specific harmonics, and some harmonics will cause amplification and even resonance.

Method used

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  • Control system of APF (active power filter)
  • Control system of APF (active power filter)

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Embodiment Construction

[0014] In order to further illustrate the present invention, the active power filter control system of the present invention will be described in more detail below in conjunction with the embodiments.

[0015] Such as figure 1 As shown, the active power filter control system of the present invention includes three-phase voltage transformers and current transformers in the system grid, DC voltage transformers and current transformers output by the APF, corresponding conditioning circuits and AD converters, Dual-core structure and drive protection circuit composed of DSP and ARM.

[0016] Various voltage transformers are provided with two sets of first voltage transformer and second voltage transformer respectively; A conditioning circuit and a second conditioning circuit, the AD converter are respectively provided with a first AD converter and a first AD converter. The sampling signals of the first voltage transformer and the current transformer are connected to the DSP throu...

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Abstract

The invention provides a control system of an APF (active power filter). The control system comprises three-phase voltage transformers and current transformers, DC voltage transformers and current transformers output by the APF, corresponding conditioning circuits and AD (analog to digital) converters, a dual-core structure comprising a DSP (digital signal processor) and an ARM as well as a drive protection circuit in a system grid. The drive protection circuit comprises a logic protection circuit, an optical coupling isolation circuit and a signal differential circuit which are sequentially connected. The control system of the APF has the benefits as follows: the multi-channel sampling of the DSP and the ARM is performed separately, the layout is clear and simple, the debugging is convenient, the communication and the management are realized, the anti-jamming capability of signals is improved, the equipment stability is improved, the stable operation of the APF is guaranteed, and the cost is saved furthest.

Description

technical field [0001] The invention relates to a control system, in particular to an active power filter control system. Background technique [0002] With the increasingly frequent use of power electronic devices and the widespread use of nonlinear loads such as rectifiers, switching power supplies, inverters, and frequency converters, the fundamental current of the power grid is distorted and harmonics are generated. Harmonics will induce grid resonance and cause serious accidents caused by harmonic overvoltage and overcurrent. Harmonics will also seriously interfere with various electrical devices, reducing service life and causing device malfunction. Increased line loss and increased heat generation will cause premature aging of the insulation, and it is very easy to cause a fire due to a grounding short circuit fault. According to different applications of nonlinear loads, the generated harmonics are also different, which brings unprecedented challenges to the traditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/20
Inventor 邵泽华姜文东周娜娜
Owner SHANDONG BLUE POWER TECH
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