Optical storage system model prediction control method based on three-phase BUCK-BOOST circuit
A technology of model predictive control and optical storage system, which is applied to circuit devices, AC network circuits, photovoltaic power generation, etc., can solve the problems of complex mathematical models and optimization calculations, increase the amount of system calculations, etc., to improve dynamic response speed and reduce ripple. Wave size and overshoot, and the effect of increasing power density
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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 an optical storage system model prediction control method based on a three-phase BUCK-BOOST circuit and belongs to the technical flied of distributed off-grid solar energy-storage cell integrated power generation supply. A reference charge / discharge current of a storage cell is computed according to an output power of a photovoltaic cell and a rated load power; whether thestorage cell works in a charge mode or a discharge mode or is in a work stopped mode is judged according to the reference current; a mathematical prediction model is established according to a workingmode of the storage cell based on different switching states of a topology, predicted currents of a next period in different switching states are computed, and the optimum switching states of switchtubes in the three-phase BUCK-BOOST circuit are selected through target function optimization, on the premise of satisfying three-phase current balance. According to the method, current ripples are reduced, moreover, response speed of a system is improved, prediction models for different states of each switch do not need to be established, and control can be realized through simple comparison, socomputing quantity of an algorithm is greatly reduced.
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