Distributed new energy power generation system and distributed mixing maximum power tracking method

Abstract

The invention discloses a distributed new energy power generation system and a distributed mixing maximum power tracking method. When the system operates, a DC-DC converter and a rear-end centralized converter respectively perform MPPT on the output power difference portion of a single new energy power generating device and the output power of a whole new energy power generation system, at the same time, the DC-DC converter can draw out energy from a rear-end DC bus to offset the difference of the output power of a front-end single new energy power generating device, and through the mutual coordination and cooperation of two MPPT functions, the whole new energy power generation system reaches maximum power output. According to the invention, the maximum power output of each new energy power generating device in the system can be realized, accurate monitoring of output power can be provided, and precision data is provided for system analysis so that the system can adjust control strategies to improve system generating efficiency, and rapid positioning of problematic assemblies is facilitated.

Description

technical field [0001] The invention belongs to the technical field of new energy, and relates to a maximum power point tracking technology of a solar photovoltaic cell grid-connected / off-grid system, in particular to a new energy power generation system, a corresponding distributed hybrid maximum power tracking system and a corresponding tracking method. Background technique [0002] The development and utilization of new energy generation technologies such as solar energy and thermoelectricity are important measures to deal with energy and environmental crises. Due to the high cost of new energy power generation equipment and low energy conversion efficiency, the cost of power generation has been greatly increased, which limits the promotion and application of new energy power generation technology. The application background of the present invention will be described below by taking a solar photovoltaic power generation system as an example. [0003] Photovoltaic grid-co...

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Problems solved by technology

[0004] At present, distributed MPPT systems are generally connected to the back end of photovoltaic modules in series. Each MPPT system processes the overall power of the photovoltaic modules connected to it, so each distributed MPPT system has a large self-loss and a large heat generation. , higher cost, lower reliability

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