Power Regulation Method for Multi-inverter Parallel Inductive Power Transfer System
An inductive power transmission, multi-inverter technology, applied in output power conversion devices, regulating electrical variables, control/regulation systems, etc., can solve the problems of large output DC voltage ripple and low system efficiency, and achieve the output voltage The effect of pulse density, improving system efficiency and reducing switching losses
Active Publication Date: 2019-03-08
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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[0008] The purpose of the present invention is to overcome the problems of low system efficiency and large output DC voltage ripple of the existing high-power multi-inverter parallel induction power transmission system at light load and half load, and propose a multi-inverter parallel connection Power regulation method for inductive power transfer system
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[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0032] figure 1 Shown is the basic composition of the parallel induction power transmission system with three inverters according to the embodiment of the present invention.
[0033] like figure 1 As shown, the inductive power transmission system of the embodiment of the present invention with three inverters connected in parallel (that is, k=3) includes a DC power supply 1, a parallel high-frequency inverter group 2, and high-frequency inverter modules 21, 22, 2k, matching Transformer group 3, matching transformer units 31, 32, 3k, separated transformer 4, separated transformer primary side coil 41, separated transformer secondary side coil 42, primary side compensation capacitor 5, secondary side compensation capacitor 6, high frequency rectifier 7 , and load 8.
[0034] The output ends of the DC power supply 1 are respectively connected t...
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A power regulation method for a multi-inverter parallel induction power transmission system, by making the high-frequency inverter module in the freewheeling state and short-circuiting the primary winding of the matching transformer unit, the output voltage pulse amplitude of the matching transformer is changed; the system k Among the high-frequency inverter modules, when all the k high-frequency inverter modules are in the working state, the matching transformers are combined to form an output voltage pulse amplitude of UP, and the m high-frequency inverter modules are in the working state, (k- m) When the high-frequency inverter module is in the freewheeling state, m=1, 2, 3,...,k, and the matching transformers are combined to form an output voltage pulse amplitude of m×UP / k. At the same time, the rated output power P of the system is divided into k power levels, and each level is m×P / k. Detect the system output power Po and compare it with the rated output power P. When the system output power Po is greater than (m-1)×P / k and less than or equal to m×P / k, control m high-frequency inverter modules to be in the working state , (k‑m) high-frequency inverter modules are in the freewheeling state, so that the matching transformers are combined to form an output voltage pulse amplitude of m×UP / k.
Description
technical field [0001] The invention relates to a high-frequency inverter power adjustment method of a multi-inverter parallel induction electric energy transmission system. Background technique [0002] Inductive electric energy wireless transmission technology has gradually entered the field of industry and life. It is the future development trend to apply to electric vehicle charging and rail transit vehicle power supply. Existing rail transit vehicles mostly use pantograph or third rail power supply. When the rail transit vehicle is running, the friction of the pantograph or the third rail is likely to produce carbon deposits, resulting in poor contact, and the vehicle is disconnected from the grid, which reduces the reliability of the power supply system and affects the service life of the vehicle power supply system equipment. Bows or third rails require high maintenance costs. The inductive power transmission using the principle of electromagnetic induction realizes ...
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IPC IPC(8): H02M3/335H02M7/483
CPCH02M3/335H02M7/483H02M1/0074H02M7/4835
Inventor 史黎明范满义李耀华
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI