Energy control strategy of photovoltaic/lithium battery hybrid system based on single particle physical model
A hybrid system and particle physics technology, applied in photovoltaic power generation, flexible AC transmission systems, battery circuit devices, etc., can solve the problems of less research on overall energy control strategies and less consideration of internal states
Active Publication Date: 2019-12-03
ZHEJIANG UNIV CITY COLLEGE
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However, in the simulation and control algorithm of the PV-BES hybrid system, the battery is regarded as a black box, its internal state is less considered, and the overall energy control strategy is less studied
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[0064] The present invention will be further described below in conjunction with the examples. The description of the following examples is provided only to aid the understanding of the present invention. It should be pointed out that for those skilled in the art, some modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
[0065] In order to overcome the following problems:
[0066] 1) The microgrid still needs fossil fuels as auxiliary energy, which is not good for environmental protection;
[0067] 2) The equivalent circuit model ECM depends on the resistance-capacitance (RC) network, and the control module under dynamic conditions will deviate from the experimental data;
[0068] 3) In the simulation and control algorithm of the PV-BES hybrid system, the battery is regarded as a black box, and ...
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The invention relates to an energy control strategy of a photovoltaic / lithium battery hybrid system based on a single particle physical model. The energy control strategy comprises the following steps: step 1, PV-BES hybrid system module design, including a photovoltaic panel array, a maximum power point tracking controller, a lithium battery pack and electronic components, wherein the whole photovoltaic panel array and the related electronic components are expressed as a set of differential algebraic equations and integrated with lithium battery model equations; step 2, modeling of the photovoltaic panel array: establishing an equivalent circuit model of the photovoltaic panel array based on a single diode; step 3, hardware and algorithm flow design of PV-BES hybrid system; and step 4, energy control strategy design of the PV-BES hybrid system, wherein the power flow between the photovoltaic panel and the battery energy storage system BES is controlled. The energy control strategy hasthe beneficial effects that the control algorithm can be effectively realized, the more accurate performance prediction and robust control can be realized, and the energy control algorithm can meet multiple performance indexes, such as zero residual energy, no overcharge phenomenon, maintaining a safe SOC range and the like.
Description
technical field [0001] The invention relates to the field of energy control, in particular to an energy control strategy for a photovoltaic / lithium battery hybrid system based on a single-particle physical model. More specifically, it involves a physical-property-based single-event model of lithium batteries and a standalone photovoltaic / lithium battery energy storage hybrid system based on mixed order finite difference method (Mixed FD) and maximum power point tracking (MPPT) mode ( PV-BES) energy control strategy. Background technique [0002] The establishment of solar photovoltaic power plants has become a feasible measure to meet the growing demand for clean energy, and the battery-free photovoltaic microgrid with optimal operation strategy can also provide uninterrupted power and reduce the total dispatching energy cost. However, at present, microgrids still need fossil fuels as auxiliary energy, which is not good for environmental protection. [0003] The lithium ba...
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Login to View More IPC IPC(8): H02J3/38H02J7/35
CPCH02J7/35Y02E10/56Y02E40/10
Inventor 汪秋婷沃奇中戚伟肖铎
Owner ZHEJIANG UNIV CITY COLLEGE