Master-slave confirmation method of inverter

Abstract

The invention discloses a master-slave confirmation method for an inverter, and belongs to the technical field of inverters, and the method comprises the steps: DC / AC module topologies of a plurality of devices are powered on for the first time, the DC / AC module topologies of the devices are in signal interaction with a CAN communication bus, and the CAN communication bus carries out the selection of a host according to the signals sent by the plurality of DC / AC modules; the host selection method comprises the following steps: if the DC / AC module topology of only one device generates signal interaction with the CAN communication bus, selecting the device as a host; and if the DC / AC module topologies of the plurality of devices perform signal interaction with the CAN communication bus at the same time, selecting a host according to a preset strategy, and taking other devices as slaves. According to the scheme, an external dial key is canceled, bootstrap logic and preemptive sequencing are carried out in software, and manual intervention faults are fundamentally eliminated.

Description

technical field [0001] The invention relates to the technical field of inverters, in particular to a master-slave confirmation method of an inverter. Background technique [0002] The process of inverter modularization is getting faster and faster, and the parallel connection between modular inverter modules has become more and more important; the current parallel connection scheme between inverter modules promoted in the market mainly adopts the master-slave method There is an important step in the parallel mode of the inverter module master-slave mode, which is to confirm which module is the master module and which module is the slave module. [0003] At present, in the process of confirming the master and the slave, the n modules of the inverter manually set the serial number of each module through the dial buttons outside the module; during the system operation, the system automatically selects the one with the smallest (or largest) serial number by default. The inverte...

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Problems solved by technology

[0004] However, there are great defects in such a solution: if the operation buttons are encapsulated inside the casing, the unity of the inverter modules will be lost, and the purpose of mutual replacement between inverter modules will not be achieved; if the buttons are reserved in the Outside the casing, it will leave a big design problem for the structural design and lose the IP level design of the inverter module; moreover, it needs to rely on external manual operation of the dial buttons; this leaves a lot of opportunities for operational errors;

[0006] However, if the slave machine happens to also fail when the master machine fails, the system may have to go through multiple inquiries before it can select the slave machine as the master machine to make the system run normally from the beginning; such a switching process logic switching delay It will be further lengthened, and the longest switching time needs to be queried N-2 times (N is the number of inverter modules)

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