Model predictive control method based on grid-connection inversion of photovoltaic system

A model predictive control, photovoltaic system technology, applied in photovoltaic power generation, single-grid parallel feeding arrangement, output power conversion device, etc., can solve the problem that the generated current brings into the harmonic impurities, the response speed is limited, and the quality of the merged current is affected. And other issues

Inactive Publication Date: 2014-11-05
上海紫竹新兴产业技术研究院
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Problems solved by technology

Due to the introduction of the carrier signal, such a method will bring harmonic impurities to the generated current, which will affect the quality of the merged current; secondly, the frequency of the generated PWM wave will be limited by the hardware conditions, resulting in a limited response speed of the adjustment. When operating When the environment becomes complex, it is easy to cause control failure

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[0033] The following will be combined with Figure 1-5 Specific embodiments of the present invention will be described in detail.

[0034] According to the effective grid-connected efficiency of cascaded inverters, the present invention proposes performance indicators with three goals of current tracking, minimum voltage variation, and minimum switching frequency. By minimizing the above performance indicators, the optimal switching variable is selected and the input inverter The output current is adjusted in the transformer circuit, so that the grid-connected current not only maintains the same frequency and phase as the grid voltage, tracks the target current, introduces the least harmonics, and has the smallest switching frequency, which is beneficial to protecting devices and saving energy.

[0035] In order to achieve the above object, the present invention proposes a model predictive control method based on photovoltaic system grid-connected inverter, which includes the ...

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Abstract

The invention relates to a model predictive control method based on grid-connection inversion of a photovoltaic system. The model predictive control method comprises the following steps: 1, building a cascade full-bridge inversion model, analyzing an output current and a DC side voltage according to an analysis result of a two-stable single-phase full-bridge inversion circuit, and acquiring an instantaneous dynamic model of a continuous time system by Kirchhoff laws; 2, building a simulation model according to the built instantaneous dynamic model by using PSIM simulation software, and performing simulation calculation based on the simulation model; 3, designing a model predictive controller based on three indexes such as expected power grid current tracking, an ideal voltage working point and switch switching frequency; and 4, determining the cascade comprehensive performance index of the model predictive controller according to the three indexes obtained in the step 3. By the model predictive control method, frequency and phase of grid-connected current and power grid voltage can be kept same, target current is traced, minimum harmonic wave is introduced, the minimum switch switching frequency is achieved, and device protection is promoted, and energy is saved.

Description

technical field [0001] The invention relates to a distributed optimization control method for grid-connected photovoltaic system inverters, in particular to a model predictive control method based on photovoltaic system grid-connected inverters, which is used in the technical field of multivariable system control. Background technique [0002] Photovoltaic power generation technology has a significant role in promoting the development and application of new energy technology and smart grid technology. Through the introduction, digestion and absorption of foreign advanced technology and independent research and development, my country has mastered the world's advanced photovoltaic device manufacturing technology, but the research on improving photovoltaic power generation efficiency, friendly grid connection, and low-voltage ride-through started relatively late. As of the end of 2011, the grid-connected installed capacity of solar photovoltaic power generation was only 2.14 m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38
CPCY02B10/10Y02E10/56
Inventor 陈友仁魏永松李少远邬晶李柠浦云飞马超
Owner 上海紫竹新兴产业技术研究院
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