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Parallel current sharing method for converters with weighted average of per-unit values of output current

A technology of output current and weighted average, which is applied in the direction of converting irreversible DC power input to AC power output, and can solve the problem of inaccurate analog signals.

Inactive Publication Date: 2009-12-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The present invention uses a pulse width weighted voting method to realize parallel current sharing control of inverters. This control method can effectively improve the inaccuracy of analog signals and improve the accuracy of current sharing control. At the same time, it can ensure that each inverter module according to its own The rating bears the corresponding output current

Method used

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  • Parallel current sharing method for converters with weighted average of per-unit values of output current
  • Parallel current sharing method for converters with weighted average of per-unit values of output current
  • Parallel current sharing method for converters with weighted average of per-unit values of output current

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specific Embodiment

[0020] One of the specific embodiments: a 10kW inverter module and three 5kW inverter modules are connected in parallel

[0021] There are 4 parallel inverter modules in this embodiment, assuming that the output current of each module accounts for 20%, 40%, 50%, and 60% of its rated value at the initial moment, and the coefficients α=0.2 and β=0.8 are taken, then The widths of the pulse width signals of the four modules are ( 0.8 - 0.2 ) 20 100 T = 0.12 T , ( 0.8 - 0.2 ) 40 100 T = 0.24 T , ( 0.8 ...

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Abstract

The invention belongs to the technical field of parallel control of inverters, and relates to a parallel current sharing method for converters with the weighted average of per-unit values of output current. The widths of pulse signals of various inverter modules are used to represent per-unit values of output current, namely the percentage that the output current of a module accounts for the rated current thereof, the average value of the per-unit values of the output current of various modules is obtained through a mode of performing weighted voting on various pulse width signals, and the modules are converted into current values according to the average value to adjust respective output current to finally achieve that the per-unit values of the output current of the modules are equal within the allowed error range and realize the current sharing control of parallel inverters. The method is applicable to the parallel current sharing control of a plurality of inverter modules, particularly to the parallel current sharing control of a plurality of inverter modules with partially equal power. The current sharing control method can remarkably improve current sharing control accuracy, and ensure that the inverter modules bear corresponding output current according to the rated values thereof at the same time.

Description

technical field [0001] The invention relates to an inverter parallel current sharing method based on the weighted average per unit value of the output current, and belongs to the technical field of inverter parallel control. Background technique [0002] The rapid development of modern science and technology has higher and higher requirements for the capacity, performance and reliability of the power supply system, which promotes the continuous deepening and extensive research of power electronics technology. The parallel connection of modular power supplies can increase the system capacity, and the parallel operation of multiple inverter modules can improve the flexibility and redundancy of the system. The key to realizing the parallel operation of multiple inverter modules is to ensure that the output currents of each inverter in the parallel system have the same frequency and phase, and the output current of each module with the same rated power is consistent, that is, to...

Claims

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Application Information

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IPC IPC(8): H02M7/48
Inventor 马运东季晓兰王爽
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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