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Multi-way MPPT photovoltaic inversion system

A photovoltaic inverter and inverter technology, applied in photovoltaic modules, photovoltaic power generation, control/regulation systems, etc., can solve problems such as failure to establish, reduce common mode current, poor practicability, etc., to increase power generation time and reduce common mode. Current, life-enhancing effect

Active Publication Date: 2015-04-29
TIANJIN RES INST OF ELECTRIC SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

The literature "Transformerless single-phase multilevel-based photovoltaic inverter" establishes a common-mode equivalent model for a single-phase bridge-type three-level grid-connected inverter, and draws the conclusion that the common-mode voltage is constant, thereby reducing the common-mode current. However, the The conclusion does not hold in the three-phase system
The literature "Research on Common-mode Current Suppression Technology of NPC Three-level Grid-connected Inverter" analyzes the common-mode characteristics of three-level photovoltaic inverters, and proposes compensation measures to enhance the common-mode suppression performance of three-level photovoltaic inverters, but , this method has poor practicability and is difficult to use in engineering practice

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Embodiment Construction

[0026] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] A multi-channel MPPT photovoltaic inverter system, including two parts: the main circuit of the inverter and the control circuit of the inverter, the photovoltaic inverter unit in the inverter circuit can be multiple, for example, the photovoltaic inverter unit can be two , three, four, six or eight, etc.; the inverter control loop includes a master station control system and multiple slave station control systems. According to the number of photovoltaic inverter units, the number of slave station control systems can be two one, three, four, six or eight, etc.; this embodiment takes four photovoltaic inverter units and four slave station control systems as an example for illustration. Such as figure 1 As shown, the current generated by the main circuit (i dc , i1 ABC ~i4 ABC ) signal, voltage (u dc , u ABC ) signal is sampled into ...

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Abstract

The invention relates to a multi-way MPPT photovoltaic inversion system which is technically characterized in that an inverter main circuit comprises a plurality of independent photovoltaic inversion units; a plurality of photovoltaic modules are connected with the corresponding photovoltaic inversion units via photovoltaic inversion unit direct current contactors and EMI (Electro-Magnetic Interference) filter circuits respectively; the photovoltaic inversion units are connected with a three-phrase power grid via an LCL (Lower Control Limit) filter circuit; the inverter control circuit is formed by connecting a main station control system and a plurality of slave station control systems; each photovoltaic inversion unit acquires respective alternating current inlet wire current, direct current voltage and direct current; and power grid voltage is acquired by the main station control system of the inverter control circuit and transmitted to the slave station control systems for common use at high speed. The system employs a high-speed communication manner between a main station and a slave station to achieve an inversion output carrier function, and reduces common mode voltage between inverters, the stability and reliability of the system are improved, common mode current through a PV (Photovoltaic) array is reduced, and the service life of a battery board is prolonged.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic inverters, in particular to a multi-channel MPPT photovoltaic inverter system. Background technique [0002] A photovoltaic power generation system usually consists of a battery panel array and a power conversion (inverter) part, and usually requires a low-frequency transformer to be placed between the inverter and the grid for electrical isolation between the grid and the PV array. Non-isolated inverters are more and more valued by manufacturers due to their advantages of high efficiency, low cost, and small size. However, if the transformer is removed, the PV array will be electrically connected to the grid, and the common-mode current will increase significantly, bringing Potential safety hazards, and will also have adverse effects on the battery board. At present, the use of multi-MPPT (Maximum Power Point Tracking, maximum power point tracking) to increase the power generation of invert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02S40/32
CPCG05F1/67H02J3/385H02S40/00Y02E10/56
Inventor 王建峰宋鹏李晓燕金雪峰田凯王自满
Owner TIANJIN RES INST OF ELECTRIC SCI
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