A high-precision special power supply and its control method
A special power supply, high-precision technology, applied in electrical components, output power conversion devices, AC power input conversion to AC power output and other directions, can solve problems such as high design difficulty, system instability, and system complexity, and achieve steady state The effect of high compensation accuracy, improved tracking accuracy and broad application prospects
Active Publication Date: 2018-12-18
HUNAN UNIV
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Problems solved by technology
Multiple PR controllers need to be used in parallel, and there is mutual interference between different frequency harmonics, which can easily lead to system instability, high design difficulty, and complex system
In the multi-synchronous rotating coordinate system, multiple synchronous rotating coordinates are generated through the phase-locked loop, so that the 6k±1 order harmonic of the load is converted into the DC flow in the rotating coordinate system, and the DC flow can be controlled by 2k sets of PI to achieve no static Poor tracking, but the high-frequency action of the switching device causes the output harmonic to have multi-frequency characteristics, and it is not easy to realize multiple rotating coordinates in the actual control system, so it can only be used in specific sub-harmonic control occasions in engineering
Method used
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[0042] see figure 1 , is a high-precision special power topology, including a full-bridge rectifier, a three-level flying capacitor dc / dc converter in the front stage, an active midpoint LC filter, and a three-level midpoint clamping dc / ac in the rear stage converter, output LC filter.
[0043] Among them, the active midpoint LC filter includes a filter inductor L o , two filter capacitors C 1 、C 2 . Filter inductance L o One end is connected to the neutral point of the previous three-level flying capacitor dc / dc converter, and the other end is connected to the neutral point of the subsequent three-level midpoint clamped dc / ac converter, that is, to the filter capacitor C 1 and C 2 connected at the midpoint. The two filter capacitors are connected in series with the two ends of the three-level mid-point clamping dc / ac converter of the subsequent stage, and the common connection point of the two filter capacitors is the three-level mid-point clamping dc / ac converter of...
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The invention discloses a high-precision special power supply and its control method. The high-precision special power supply includes a full-bridge rectifier, a three-level flying capacitor dc / dc converter in the front stage, an active mid-point LC filter, and a rear stage Three-level mid-point clamped dc / ac converter, output LC filter, through reasonable design of active mid-point LC filter can filter out the harmonic components of the front and rear converters and maintain the stability of the neutral point voltage; The dc / ac converter adopts a compound control method combining proportional integral and repetitive control. The high-precision repetitive controller adopts a fractional compensator to effectively avoid tracking frequency offset and improve control accuracy and tracking speed.
Description
technical field [0001] The invention relates to the field of power electronics, in particular to a high-precision special power supply and a control method thereof. Background technique [0002] With the rapid development of modern industry, the harmonics generated by various electrical equipment and power supply devices have become increasingly serious pollution problems to the mains power supply. In order to effectively eliminate the damage caused by various power grid interferences to electrical equipment and communication networks, and to provide reliable, high-quality pure power for electrical equipment, high-precision special power supplies are used in various power environments for their superior performance. All kinds of power supply equipment provide the most complete protection and are widely used. In aerospace, industry, environmental protection, medical treatment, national defense, and scientific research, high-precision special power supplies are widely used an...
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IPC IPC(8): H02M7/5387H02M7/5395H02M1/12H02M5/458
CPCH02M1/12H02M5/458H02M7/5387H02M7/5395H02M1/0067
Inventor 徐千鸣洪乐荣罗安陈燕东何志兴周乐明周小平戴瑜兴
Owner HUNAN UNIV