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A scheduling method for tracking photovoltaic planned output using battery energy storage and hydrogen energy storage

A technology of planned output and battery energy storage, applied in the fields of photovoltaic power generation, computing, energy storage, etc., can solve the problems of high charging and discharging rate, battery life attenuation, and excessive battery discharge depth.

Active Publication Date: 2020-08-18
XI AN JIAOTONG UNIV +1
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  • Description
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Problems solved by technology

In addition, due to the large dependence of the existing dispatching scheme on the energy storage battery, when there is a large deviation between the actual photovoltaic output power and the planned output, the battery may have problems such as excessive discharge depth and high charge-discharge rate. Accelerated battery life decay

Method used

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  • A scheduling method for tracking photovoltaic planned output using battery energy storage and hydrogen energy storage
  • A scheduling method for tracking photovoltaic planned output using battery energy storage and hydrogen energy storage
  • A scheduling method for tracking photovoltaic planned output using battery energy storage and hydrogen energy storage

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Embodiment Construction

[0089] see figure 1 , The photovoltaic power generation system with battery energy storage and hydrogen energy storage includes two energy conversion lines of electric energy chain and hydrogen energy chain.

[0090] In the electric energy chain, the photovoltaic power generation system sells electricity to the grid, and the storage battery and electrolyzer are used to assist the photovoltaic power generation system to track its planned output. The tank can only absorb electrical energy and convert it into hydrogen energy. The input power range of the battery is -P Bmax to P Bmax , the rated input / output power is P BN . The input power of the battery P B A positive number indicates battery charging, and a negative number indicates battery discharge. The input power of the electrolyzer is P E , the input power range of its normal operation is P Emin to P Emax , in this power range, the hydrogen production rate of the electrolyzer is related to P E Proportional. When ...

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Abstract

The invention discloses a scheduling method for tracking a photovoltaic planned output by using a battery storage energy and a hydrogen storage energy. The scheduling method comprises the steps of making an output plan of a next day based on a short-term photovoltaic prediction power, and making different day-ahead scheduling schemes according to magnitudes and fluctuation violent degrees of prediction errors of photovoltaic powers in a sunny day and a non-sunny day; correcting a day-ahead photovoltaic planned output by using an ultrashort-term photovoltaic prediction power; and then, selecting an appropriate real-time scheduling scheme according to a state of charge of a storage battery, and calculating an actual output of a photovoltaic power generation system as well as input powers ofthe storage battery and an electrolytic bath to output to a central control unit of the photovoltaic power generation system, thereby performing real-time scheduling on each power generation electricmodule in the system. The impact on the power system is reduced, the frequency modulation pressures of water and thermal generation units are alleviated, an energy storage battery is guaranteed to work in a low-load state beneficial to prolonging the service life, the frequent change of the energy storage battery due to premature failure is prevented, and the total cost in a whole life cycle of the system is reduced.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation and energy storage, and in particular relates to a scheduling method for tracking photovoltaic planned output by utilizing battery energy storage and hydrogen energy storage. Background technique [0002] As global energy and environmental problems become more and more serious, photovoltaic power generation technology has become a research and development hotspot in countries all over the world. Since photovoltaic power is intermittent and fluctuating, connecting it directly to the grid will degrade power quality. This problem can be effectively solved with the help of large-scale energy storage technology. Hydrogen energy storage is a high-quality and cheap large-scale energy storage technology. It can meet the power supply demand of extremely short or long time at the same time. It has high energy density, low operation and maintenance costs, long-term storage, and no poll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/28H02J3/32G06Q10/06G06Q50/06
CPCG06Q10/06312G06Q50/06H02J3/28H02J3/32H02J3/383H02J2203/20Y02E10/56Y02E60/36Y02E70/30Y04S10/50
Inventor 宋政湘梁芷睿王建华张国钢
Owner XI AN JIAOTONG UNIV
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