A parallel inverter system based on zigbee technology

Abstract

The invention discloses an inverter parallel connection system based on zigbee technology, comprising an AC bus, a bus controller connected to the AC bus, and a group of inverter modules connected in parallel to the AC bus; the bus controller includes a bus Controller zigbee radio frequency chip CC2430, bus controller detection circuit and bus controller wireless transceiver circuit; the inverter module includes an inverter connected to the AC bus, and an inverter controller, the inverter control The inverter includes inverter controller zigbee radio frequency chip CC2430, DSP chip, memory, peripheral input unit, output display unit and inverter controller wireless transceiver circuit. The inverter parallel system provided by the present invention can self-diagnose faults, quickly locate the faulty inverter module, remove it from the parallel system, and evenly distribute the load current to each inverter; and can realize hot plugging pull.

Description

technical field [0001] The invention relates to an inverter parallel connection technology, in particular to an inverter parallel connection system based on zigbee technology. Background technique [0002] With the development and demand of the society, many load devices have more and more requirements on the power capacity of the inverter, and the scalability and reliability of the single-module inverter are greatly restricted. Therefore, the parallel connection of multi-module inverters is designed Grid-connected power generation is particularly important. Parallel operation of multiple inverters is an effective way to expand the capacity of the inverter. Parallel inverters have the following advantages: (1) It can flexibly expand the capacity of the inverter system; (2) It can form a parallel redundant system , improve the reliability of the system operation, and in the event of failure, it can be easily replaced or repaired. However, there are still many technical prob...

AI Technical Summary

Problems solved by technology

However, there are still many technical problems to be solved urgently in the parallel connection of inverters. For example, when multiple inverters are connected in parallel, there will be phase differences, and the synchronization problem must be considered. In particular, how to avoid the generation of circulating current has become an important issue.

[0003] Several control methods commonly used at present include centralized control, master-slave control, 3C control, decentralized logic control and parallel control without interconnection wires, but these control methods have certain defects: the centralized control method has many signal lines. , making each other susceptible to interference, so the reliability is not high; the master-slave control method cannot fully realize the equivalence of the master-slave modules; the mutual influence between the modules in the 3C control method is enhanced, and the control of the parallel scheme is more difficult; the decentralized logic Due to the existence of interconnection wires in the control method, the system is susceptible to certain interference; and the parallel control method without interconnection wires is only a theoretical study so far, and there are no successful use cases in practice.

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