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Embedded energy storage type multi-module series-connected photovoltaic DC (direct current) boost converter and application method

A technology of DC boost and converter, which is applied in the direction of converting DC power input to DC power output, photovoltaic power generation, and parallel operation of DC power supplies, which can solve the outstanding problem of parallel stability of multiple inverters and the inability to realize the maximum power point of photovoltaics Problems such as tracking, voltage over-limit and wide-frequency oscillation frequently occur, so as to improve the overall control response speed, improve the operation adaptability of the device, and eliminate the effect of influence

Active Publication Date: 2017-05-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) The stability problem of multi-inverter parallel connection under the support of weak synchronization is prominent, and the voltage exceeds the limit and the wide frequency domain oscillation occurs frequently;
[0005] 2) The loss of the exchange and collection lines in the station and between stations is large, and the overall efficiency of the system is low
The DC-DC device selected in this document is a non-isolated DC-DC converter. The range of voltage gain that can be achieved by this converter is small. Modules cannot achieve maximum power point tracking of photovoltaics

Method used

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  • Embedded energy storage type multi-module series-connected photovoltaic DC (direct current) boost converter and application method
  • Embedded energy storage type multi-module series-connected photovoltaic DC (direct current) boost converter and application method
  • Embedded energy storage type multi-module series-connected photovoltaic DC (direct current) boost converter and application method

Examples

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Embodiment

[0115] Such as Figure 4The shown multi-sub-module series structure uses a system of 8 modules for simulation experiments. The photovoltaic cell module used in the simulation is SunPower SPR-305-WHT, and the module is connected in series and parallel to form 15×22 (that is, each photovoltaic array contains 22 photovoltaic strings in parallel, and each photovoltaic string is composed of 15 photovoltaic cell modules in series. into) photovoltaic array. Under the conditions of light intensity of 1000W / m2 and temperature of 25°C, the voltage of the maximum power point of the photovoltaic array is 820.5V, and the maximum power is about 100kW. The rated voltage of the battery pack is 600V, the rated capacity is 300Ah, and the internal resistance is 1Ω; the rated voltage of the supercapacitor is 600V, the rated capacity is 30F, and the internal resistance is 0.1Ω.

[0116] The parameters of the simulation circuit are: (1) the inductance value L2 of the Buck-Boost converter = 5mH; (...

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Abstract

The invention provides an embedded energy storage type multi-module series-connected photovoltaic DC (direct current) boost converter and an application method. The embedded energy storage type multi-module series-connected photovoltaic DC boost converter comprises multiple photovoltaic DC boost converter submodules which are connected in series sequentially, wherein each photovoltaic DC boost converter submodule comprises a hybrid energy storage module, an isolated type full-bridge DC-DC circuit, a two-way boost / buck converter and a photovoltaic array, the hybrid energy storage module is used for balancing power output by the photovoltaic DC boost converter submodule, the isolated type full-bridge DC-DC circuit is used for realizing voltage boosting and maximum power point tracking, and the two-way boost / buck converter is used for controlling output power of the hybrid energy storage module. The system can eliminate influence of input power mismatch on normal operation of the photovoltaic DC boost converter fundamentally, a low-voltage DC bus is not needed, meanwhile, reliability of the system is enhanced, and internal fault isolation is convenient; a header box is not required to be arranged, the system is convenient to maintain, and overall control response speed under the special condition of a power station is increased.

Description

technical field [0001] The invention relates to the field of new energy power generation and the field of topological structure of power electronic converters, in particular to an embedded energy storage type multi-module series photovoltaic DC boost converter and an application method. Background technique [0002] Photovoltaic power generation is one of the most important forms of new energy power generation at present, and it is the main force for my country to realize the replacement of renewable energy in the future. The distribution of light resources in my country and the pattern of the power system determine that large-scale construction and centralized grid connection will become an important form of photovoltaic development and utilization in the future. [0003] Photovoltaic power generation has the inherent characteristics of low power density, low export voltage, and large random fluctuations. It must be boosted and converged by the collection system to achieve ...

Claims

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Application Information

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IPC IPC(8): H02M3/155H02J1/12H02J3/38H02J7/34
CPCH02J3/385H02J1/12H02J7/345H02M3/155H02M1/0077H02M1/0083Y02E10/56
Inventor 朱淼徐莉婷李修一苏明章蔡旭
Owner SHANGHAI JIAO TONG UNIV
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