An Inverter Light-load Efficiency Optimization Method Based on Inductor Current Critical Continuous Control Strategy
A technology of inductive current and critical continuity, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problems of inverter efficiency reduction and light load efficiency, and improve efficiency , the effect of improving efficiency
Active Publication Date: 2019-04-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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It can be seen from the figure that the lighter the load, the higher the switching frequency of the switching tube in the entire power frequency cycle. Based on the critical continuous control strategy of the inductor current, the switching tube can be turned on at zero voltage, and there is basically no turn-on loss, but the turn-off loss cannot be avoided. The higher the frequency, the greater the turn-off loss, resulting in lower efficiency at light load
attached Figure 4 This is the measured efficiency curve of the inverter based on the inductor current critical continuous control strategy. It can be seen from the efficiency curve that the efficiency of the inverter is reduced by 3.5% under 10% light load compared with full load
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[0024] The method of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0025] attached image 3 As shown, it is the switching frequency change diagram of the high-frequency switching tube within half the power frequency cycle range under different output powers. The lighter the load, the higher the switching frequency, so the greater the turn-off loss, resulting in lower efficiency at light load , with Figure 4 As shown, is the efficiency of the entire load range of the inverter, and it can be seen that under light load, the efficiency decreases obviously. For the critical continuous control strategy of the inductor current, reducing the input bus voltage value can reduce the switching frequency, thereby reducing the turn-off loss and improving the light-load efficiency of the inverter. attached Figure 5 It is the efficiency test curve of the input voltage lowered from 380V to 330V under light load and resistive load ...
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The invention discloses a method for optimizing light load efficiency of an inverter based on an inductive current critical continuous control strategy and belongs to the technical field of power electronic converters. Soft switching-on of an inverter switching element is realized through the inductive current critical continuous control strategy; and a switching frequency of an inverter is directly related to output power and input voltage. Under the condition of a constant input voltage, the switching frequency of the inverter increases with reduction of a load, the switching-off loss is increased, and the light load efficiency of the inverter is reduced. In order to improve the light load conversion efficiency, the switching frequency is reduced and the switching loss is decreased through a method of reducing the input voltage under the condition of a light load, and thus the light load conversion efficiency is improved.
Description
technical field [0001] The invention relates to an inverter light-load efficiency optimization method based on an inductor current critical continuous control strategy, and belongs to the technical field of power electronic converters. Background technique [0002] Grid-connected inverters have broad application prospects in new energy power generation and distributed power generation. Increasing the switching frequency of the inverter is an important trend in the design of grid-connected inverters. A high switching frequency can reduce the size of passive components, thereby increasing the power density of the grid-connected inverter. However, increasing the switching frequency will not only increase the switching loss, but also bring greater EMI interference. [0003] Soft switching technology can increase the switching frequency while ensuring higher efficiency and lower EMI interference. At present, soft switching technology mainly includes passive soft switching techn...
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IPC IPC(8): H02M7/5387H02M7/5395H02J3/38
CPCH02J3/38H02M7/53873H02M7/5395
Inventor 胡海兵赵阳于波许亚坡
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS