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High-frequency isolated multi-low voltage DC bus collecting photovoltaic medium voltage grid-connected power generation system

A low-voltage direct current, high-frequency isolation technology, applied in the direction of photovoltaic power generation, AC network circuits, control/regulation systems, etc., can solve the problem of small harmonic content of the output voltage waveform, achieve stable output voltage and power, reduce volume, high efficiency effect

Inactive Publication Date: 2019-04-26
浙江华云清洁能源有限公司 +1
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  • Abstract
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Problems solved by technology

The structure of the photovoltaic medium-voltage grid-connected power generation system has high-voltage and large-capacity frequency conversion capabilities, and the harmonic content of the output voltage waveform is small. It is easy to be modularized and expanded. The high-voltage side of each module no longer needs capacitor support and voltage equalization control. It has the advantages of being connected to the high-voltage power grid, and at the same time solves the problems of secondary side commutation and voltage spikes of traditional single-stage converters, and can realize power conversion between low-voltage DC and high-voltage AC

Method used

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  • High-frequency isolated multi-low voltage DC bus collecting photovoltaic medium voltage grid-connected power generation system
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  • High-frequency isolated multi-low voltage DC bus collecting photovoltaic medium voltage grid-connected power generation system

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Embodiment Construction

[0068] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0069] The structure of the high-frequency isolated multi-low-voltage DC busbars collecting photovoltaic medium-voltage grid-connected power generation system is characterized in that: the structure of the photovoltaic grid-connected power generation system, its centralized photovoltaic cell components are divided into multiple arrays, and each photovoltaic array (PV array ) is connected in parallel with the isolated modular cascaded converter module group (inverter cellAn, inverter cellBn, inverter cellAn) corresponding to the three phases. The advantages of this structure are: there is no problem of unbalanced three-phase power caused by partial shadows; indepe...

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Abstract

The invention discloses a high-frequency isolated multi-low voltage DC bus collecting photovoltaic medium voltage grid-connected power generation system comprising a plurality of arrays of concentrated photovoltaic battery packs, and an array of each concentrated photovoltaic battery pack and an isolated modular cascade converter module group corresponding to three phases are connected in parallel. The system has the advantages of solving the problem of three-phase power imbalance caused by partial shadow; achieving the independent MPPT control and improving the power generation efficiency; reducing the DC side voltage and improving the stability and the safety; improving the system scalability and the redundancy; eliminating or reducing secondary power fluctuation of an independent capacitor at the low-voltage DC bus connecting portion, thereby greatly reducing the size of the individual capacitor at the low-voltage DC bus connecting portion.

Description

technical field [0001] The invention relates to the field of photovoltaic grid-connected power generation systems, in particular to a high-frequency isolated multi-low voltage DC bus-bar collection photovoltaic grid-connected power generation system. Background technique [0002] The depletion of fossil energy and the increasingly severe environmental pollution have made it more urgent for people to develop clean and pollution-free renewable energy. Due to its abundant reserves, wide distribution and environmental friendliness, solar photovoltaic power generation is an ideal solution. How to improve the utilization rate of solar energy and reduce the overall volume of photovoltaic power generation system devices is an urgent problem to be solved at present. [0003] Usually, the new energy power generation system unit generates the desired grid-connected voltage (6-36kV) through a voltage source converter and installs a low-voltage power frequency transformer, and collects ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/537H02M3/335
CPCH02J3/383H02J3/385H02M3/33576H02M7/537H02M1/007Y02E10/56Y02A30/60
Inventor 应鸿游锋沈宝兴刘闯蔡国伟张皓然陈琦吴星昂
Owner 浙江华云清洁能源有限公司
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