Modular parallel inverting system with loading self-adapting function and control method thereof

Abstract

The invention relates to a modular parallel inverting system with a loading self-adapting function and a control method thereof. In the system, direct current is input through a power distribution module, and is output to the direct current input end of each inverting power module; and each inverting power module is used for inverting input direct current into alternating current for input to an inversion monitoring module, and the power distribution module is used for outputting alternating current to a user. The method comprises the following steps of: if the loading self-adapting function is allowed to be used, transmitting a parallel operation permission output signal to a first inverting power module; when the total loading current is increased and is more than the cut-over current I20 of a second inverting power module, transmitting a parallel operation permission output signal to the second inverting power module; specific to all inverting power modules, calculating the quantity m of the inverting power modules allowing parallel operation; and transmitting a current-sharing command I / m to each inverting power module. According to the invention, the put-in quantity of the inverting power modules is controlled automatically, so that the whole working efficiency of an inverting system is increased under the efficient working condition of the inverting power modules, and the loading ability is high.

Description

technical field [0001] The invention relates to an inverter technology in the field of power electronics, in particular to a modular parallel inverter system with a load self-adaptive function and a control method. Background technique [0002] At present, most of the modular parallel inverters are designed for fixed electric loads. During operation, all inverter power modules are in working state and share the load equally, which cannot be adjusted reasonably. Moreover, the transformer pre-settings in the inverter power modules generate The harmonics are large, the electromagnetic interference is large, and the load capacity and isolation performance are also poor, so the use of modular parallel inverter equipment is limited. And because the efficiency of the inverter equipment is low at light load, when using this kind of parallel inverter equipment to supply random and time-varying domestic electrical loads, the overall working efficiency of the inverter system is low. ...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the modular parallel inverters are designed for fixed electric loads. During operation, all inverter power modules are in working state and share the load equally, which cannot be adjusted reasonably. Moreover, the transformer pre-settings in the inverter power modules generate The harmonics are large, the electromagnetic interference is large, and the load capacity and isolation performance are also poor, so the use of modular parallel inverter equipment is limited

And because the efficiency of the inverter equipment is low at light load, when using this kind of parallel inverter equipment to supply random and time-varying domestic electrical loads, the overall working efficiency of the inverter system is low

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