Dynamic coordination control method of high-power APF parallel-machine harmonic compensation system
A system dynamic and coordinated control technology, applied in active power filtering, AC network to reduce harmonics/ripples, etc., to achieve the effect of improving compensation accuracy, improving operational reliability, and reducing system operating losses
Active Publication Date: 2016-02-24
SOUTHEAST UNIV
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[0008] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a dynamic coordination control method for a high-power APF parallel harmonic compensation system, which solves the deficiencies in the existing coordination control method for the treatment of large-current harmonic pollution sources, mainly For harmonic loads with complex dynamic waveforms such as DC speed control motors in rolling mills (the specific harmonics of such loads are much higher than other harmonics at a certain time), to achieve the optimal use of the compensation capacity of the whole machine
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[0030] The present invention will be further described below in conjunction with the accompanying drawings.
[0031] like figure 1 Shown is a schematic block diagram of the whole machine control system of the present invention, the master controller and several slave controllers realize dynamic coordinated control, each slave controller corresponds to a power module, and the slave controller monitors the module operation status of the corresponding power module.
[0032] The main controller includes a harmonic fractionation detection unit, a harmonic real-time comparison operation unit, a system operation state monitoring unit, a compensation command current generation and distribution unit, and a power module time base synchronization unit; the harmonic fractionation detection unit, according to the collected The load current signal and grid-side voltage signal can separate each harmonic in real time; the harmonic real-time comparison operation unit can compare the harmonic c...
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The invention discloses a dynamic coordination control method of a high-power APF parallel-machine harmonic compensation system. Dynamic coordination control is realized via a master controller and slave controllers. The method specifically includes: 1) when the load harmonic content is low and the distribution of subharmonic frequency spectrums is uniform, the compensation of the whole machine is realized according to a multi-machine current-sharing mode, and module minimization operation is performed; and when the load harmonic content is high or the distributions of the subharmonic frequency spectrums are quite different, the compensation of the whole machine is realized according to multi-machine divided and current sharing mode, and a multi-machine divided compensation group compensates main subharmonic waves in a centralized manner according to a dynamic priority sequence; 2) the master controller detects the load subharmonic contents in real time, compares the load subharmonic contents, sets a compensation dynamic priority, and selects the whole machine operation mode in real time; and 3) the master controller and the slave controllers monitor the operation state of a power module in real time, and selective fault restart is performed in the state of fault shutdown. According to the method, the reliability of the high-power APF parallel-machine system is improved, dynamic capacity optimization allocation is realized, and the feasibility and practical values are very good.
Description
technical field [0001] The invention relates to the field of power systems, in particular to a compensation capacity distribution method of a high-power multi-machine parallel active power filter in the power electronics technology. Background technique [0002] Low-voltage harmonic pollution sources widely exist in the power grid, such as rolling steel, electrolytic aluminum, shopping mall lighting, etc. These harmonic pollution will have a serious impact on the power grid, other electrical equipment, especially the reliability of power consumption. At present, the harmonic control scheme is mainly divided into passive type and active type: the passive type control device has a large volume and weight, and is prone to resonance, and is not easy to limit current output; the active type control device has high controllability and fast response performance , can dynamically compensate the harmonics in the power grid in real time, so it has gradually become the first choice for...
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Login to View More IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 赵剑锋刘康礼曹武尤鋆
Owner SOUTHEAST UNIV