Inverter parallel system based on zigbee technology

Abstract

The invention discloses an inverter parallel system based on a zigbee technology. The inverter parallel system comprises an alternating current bus, a bus controller which is connected to the alternating current bus, and a group of inverter modules which are connected to the alternating current bus in parallel, wherein the bus controller comprises a bus controller zigbee radio frequency chip CC2430, a bus controller detection circuit and a bus controller wireless transmitting and receiving circuit; the inverter modules respectively comprise an inverter which is connected to the alternating current bus, and an inverter controller; and the inverter controller comprises an inverter controller zigbee radio frequency chip CC2430, a digital signal processing (DSP) chip, a memory, a peripheral input unit, an output display unit and an inverter controller wireless transmitting and receiving circuit. By adoption of the inverter parallel system provided by the invention, a fault can be self-diagnosed; a fault inverter module is quickly positioned; the fault inverter module is cut off from the parallel system; a load current is uniformly allocated to each inverter; and hot-plug can be realized.

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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