A Communication Method for Modular Design of Photovoltaic DC Boost Converter
A modular design, DC boost technology, applied in DC power input conversion to DC power output, photovoltaic power generation, instruments, etc., can solve problems such as module voltage imbalance, to maintain operating speed, realize decoupling, and protect equipment Effect
Active Publication Date: 2021-11-05
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology
This solution adopts the combination of system centralized control and module decentralized control, which effectively solves the problem of resource allocation of the main control unit of the multi-module system, and at the same time avoids the risk of system failure caused by the unbalanced voltage of the modules in operation caused by complete decentralized control.
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[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.
[0023] like figure 1 As shown, the photovoltaic DC boost converter control system includes a main control unit and multiple module control units. The photoelectric isolation unit is used as a unified external interface between the main control unit and the module control unit, and optical fiber high-speed communication is used to realize the coordinated control between the system and the modules. In order to realize the high-speed and reliable ope...
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The invention discloses a communication method aimed at the modular design of photovoltaic DC boost converters. The combined structure of the module input parallel / output series (IPOS) of the centralized photovoltaic DC boost converter is aimed at the circuit characteristics of the IPOS cascading scheme. The system adopts a distributed control architecture. The photoelectric isolation unit is used as a unified external interface between the main control unit and the module control unit. Optical fiber high-speed communication is used to realize the coordinated control between the system and modules. The invention is a communication protocol for the converter of the distributed control architecture, which adds a communication self-check function before the converter is started, checks the communication link before the system starts, and improves the communication reliability of the converter. At the same time, in order to ensure the speed of communication, the communication self-inspection data and the effective communication data are switched. After the communication self-inspection is completed, only effective data is transmitted between the communication links, and the main control unit and the module control unit are maintained at the same time. communication speed and reliability.
Description
technical field [0001] The invention relates to the field of power electronics, in particular to a communication method for the modular design of a photovoltaic DC boost converter. Background technique [0002] In order to adapt to the wide range variation characteristics of photovoltaic output power and voltage, the system integration and control technology of high-efficiency DC / DC boost converter is studied. The photovoltaic DC boost converter adopts a modular design, and realizes the design requirements of high voltage, high power and high boost ratio of the converter through the module input parallel output series (IPOS) method. In the prior art, resource allocation of the main control unit of the multi-module system is difficult, and at the same time, complete decentralized control leads to unbalanced module voltage during operation, which easily causes system failure. Contents of the invention [0003] The purpose of the present invention is to realize the high-spee...
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IPC IPC(8): H02M3/00H04L12/26
CPCH02M3/00H04L43/50Y02E10/56
Inventor 魏苗苗张新雷王环王一波周宇窦德刚
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI