Model Predictive Control Method for Photovoltaic Storage System Based on Three-phase Buck-Boost Circuit
A technology of model predictive control and optical storage system, which is applied in the direction of circuit devices, AC network circuits, photovoltaic power generation, etc., can solve the problems of increasing system calculation amount, mathematical model and optimization calculation complexity, etc., to reduce ripple size and overshoot The effect of increasing the volume, improving the dynamic response speed and reducing the volume
Active Publication Date: 2021-11-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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However, if the control method of single-phase model prediction is applied to the three-phase DC / DC circuit, the calculation amount of the system will be greatly increased, and the mathematical model and optimization calculation will be more complicated.
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[0039] The present invention will be described in further detail below in conjunction with the implementation examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0040] Such as figure 1 As shown, the optical storage system applied in the present invention includes an energy storage device, a photovoltaic system and a three-phase BUCK-BOOST circuit. The energy storage device is connected to the photovoltaic system through the three-phase BUCK-BOOST circuit. The present invention is based on the three-phase BUCK-BOOST circuit. Propose a model predictive control method applied to the optical storage system, the structure diagram of the three-phase BUCK-BOOST circuit figure 1 As shown, including switch tubes D1-D6 and inductors L1-L3, the energy storage device is a battery as an example.
[0041] Repeating the model predictive control method proposed by the present invention can periodically optimize and adjust the optical...
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The invention discloses a model predictive control method for an optical storage system based on a three-phase BUCK-BOOST circuit, which belongs to the technical field of distributed off-grid solar-battery integrated power generation and power supply. First, calculate the reference charging and discharging current of the battery according to the output power of the photovoltaic cell and the rated load power; then judge whether the battery is working in the charging mode, discharging mode or stop working mode according to the reference current; then according to the working mode of the battery based on different topology A mathematical prediction model is established for the switching state, and the predicted current of a cycle under different switching states is calculated. Finally, the optimal switching state of the switching tube in the three-phase BUCK-BOOST circuit is selected after optimizing the objective function and satisfying the three-phase current balance. The present invention can improve the response speed of the system while reducing the current ripple; and the present invention does not need to establish prediction models for different states of each switch, and only needs simple comparison to realize control, greatly reducing the calculation amount of the algorithm.
Description
technical field [0001] The invention belongs to the technical field of distributed off-grid solar-battery integrated power generation and power supply, and in particular relates to a model predictive control method for an optical storage system based on a three-phase BUCK-BOOST circuit. Background technique [0002] In recent years, various new energy distributed power generation systems have begun to enter people's lives. Among them, solar energy has become the darling of new energy distributed power generation systems due to its abundant sources, cleanness and reliability. [0003] However, solar power generation is greatly affected by the environment, so that the output power of photovoltaic cells fluctuates greatly, and the phenomenon of low output power may also occur. In order to improve the power output quality of the photovoltaic system and make full use of solar energy resources, batteries are usually incorporated into the photovoltaic system to adjust the output p...
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IPC IPC(8): H02J3/32H02J3/38H02J3/01
CPCH02J3/383H02J3/01H02J3/32H02J2203/20Y02E10/56Y02E40/40
Inventor 徐自强马云飞吴孟强伍青李湜
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA