Embedded energy storage type multi-module series photovoltaic DC boost converter and application method
A DC boost and converter technology, which is applied in the direction of converting DC power input to DC power output, photovoltaic power generation, parallel operation of DC power supplies, etc. It can solve the outstanding stability problem of multiple inverters in parallel and cannot achieve the maximum power point of photovoltaics. Tracking, voltage out-of-limit and wide-frequency oscillations frequently occur, so as to improve the overall control response speed, improve the operating adaptability of the device, and eliminate the impact.
Active Publication Date: 2020-05-22
SHANGHAI JIAOTONG UNIV
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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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[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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The invention provides an embedded energy storage type multi-module series-connected photovoltaic DC boost converter and an application method, comprising a plurality of photovoltaic DC boost converter sub-modules connected in series in sequence, and the photovoltaic DC boost converter sub-module includes: Hybrid energy storage modules, isolated full-bridge DC‑DC circuits, bidirectional buck-boost converters, and photovoltaic arrays; hybrid energy storage modules are used to balance the power output of photovoltaic DC boost converter sub-modules; isolated full-bridge DC‑ The DC circuit is used to achieve boost and maximum power point tracking; the bidirectional boost / buck converter is used to control the output power of the hybrid energy storage module. The system in the present invention can fundamentally eliminate the influence of input power mismatch on the normal operation of the photovoltaic DC boost converter, without setting a low-voltage DC bus, and at the same time enhance the reliability of the system and facilitate the isolation of internal faults; It is convenient for system maintenance and improves the overall control response speed under special circumstances of the power station.
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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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 JIAOTONG UNIV
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