Master-slave inverter parallel system switching control method and device
A control method and system switching technology, applied in the direction of output power conversion device, circuit device, AC power input conversion to DC power output, etc., can solve the problem that the reliability of parallel system operation is difficult to guarantee, and the lack of inverter output voltage self-test to achieve smooth switching and transition, avoid shocks, and improve operational reliability
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[0080] Example 1
[0081] A master-slave inverter parallel system switching control method, such as figure 2 As shown, it is a schematic structural diagram of the master-slave inverter parallel system provided by the present invention. The master-slave inverter parallel system includes multiple inverters, and each inverter is correspondingly provided with an AC output switch and a control board. The output terminals of multiple inverters are respectively connected to the same AC side common busbar through the AC output switch, and the control board of each inverter is connected in turn through the sending terminal and the receiving terminal to form a ring; such as image 3 As shown, a control flow chart of a switching control method for a master-slave inverter parallel system provided by the present invention is given, and the switching control method includes:
[0082] Step 1: In the parallel system of master-slave inverters, each inverter is started in voltage mode; the co...
Example Embodiment
[0106] Example 2
[0107] Corresponding to Embodiment 1 of the present invention, Embodiment 2 of the present invention further provides a switching control device for a master-slave inverter parallel system, wherein the master-slave inverter parallel system includes multiple inverters, and each inverter The inverter is provided with an AC output switch and a control board. The output terminals of multiple inverters are respectively connected to the same AC side common busbar through the AC output switch. The control board of each inverter is sequentially connected through the sending terminal and the receiving terminal. The switching control device includes: an output voltage harmonic content detection module, which is used to detect the output voltage harmonic content of all inverters before the parallel system starts, and control the inverter with abnormal output voltage to automatically exit the parallel system .
[0108] Specifically, the output voltage harmonic content ...
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