A carrier synchronization method and device for a photovoltaic inverter parallel system
A photovoltaic inverter, carrier synchronization technology, applied in synchronization devices, transmission systems, digital transmission systems, etc., can solve the problems of long-distance carrier synchronization, which is highly disturbed and difficult to implement in one master and multiple slaves.
Active Publication Date: 2018-07-03
SUNGROW POWER SUPPLY CO LTD
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[0004] In view of this, the present invention provides a method and device for carrier synchronization of a photovoltaic inverter parallel system to solve the problems in the prior art that long-distance carrier synchronization is highly disturbed and difficult to implement in a multi-slave mode.
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[0067] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0068] The invention provides a method and device for carrier synchronization of a photovoltaic inverter parallel system to solve the problems in the prior art that long-distance carrier synchronization is highly disturbed and difficult to implement in a multi-slave mode with one master.
[0069] Specifically, the photovoltaic inverter parallel system carrier synchronization method is applied to the photovoltaic inverter parallel system carrier synchronization ...
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This application provides a method for carrier synchronization of a photovoltaic inverter parallel system. The CPLD carrier synchronization processing unit is set according to the priority to detect whether the master has received the PWM synchronization clock signal; to detect whether the slave has received the carrier of the upper level. The synchronous signal output by the control circuit, when detected, the synchronous signal output by the carrier control circuit of the upper stage is used as the PWM synchronous clock signal; the two carrier control circuits connected to the carrier control circuit receive the PWM synchronous clock signal, through Ring communication realizes carrier synchronization control. Adopting the carrier synchronization method of the photovoltaic inverter parallel system to realize carrier synchronization control, even if the distance between each inverter is relatively long, the carrier control circuit connected to each inverter is connected in a ring shape, which can solve the current problem There is a problem that the long-distance carrier synchronization of the technology is greatly disturbed, and it is difficult to realize the multi-slave mode of one master.
Description
technical field [0001] The invention relates to the technical field of photovoltaic inverters, in particular to a carrier synchronization method and device for a parallel system of photovoltaic inverters. Background technique [0002] In the parallel connection system of two or more photovoltaic inverters, there is a circulation problem between the inverters, which affects the normal operation of the system. When the DC voltage of each inverter is inconsistent or has a large difference, the circulation problem and the resulting The DC common-mode voltage problem will be more prominent. At present, the purpose of suppressing the circulating current is mainly achieved by controlling the current sharing of each photovoltaic inverter in the inverter parallel system, or connecting impedance elements in series on the output side of the inverter, but it is impossible to fundamentally solve the problem between inverters. The difference in voltage, phase, etc., cannot fundamentally ...
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IPC IPC(8): H04L7/00
Inventor 王志成程林陶磊潘年安冯纪归
Owner SUNGROW POWER SUPPLY CO LTD