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A control method for energy storage to suppress rapid power changes of photovoltaic power plants

A photovoltaic power station and control method technology, applied in photovoltaic power generation, energy storage, electrical components, etc., can solve problems such as affecting the service life, large deviation, and the capacity of the energy storage system is not optimized, so as to improve stability and reduce system costs. Effect

Active Publication Date: 2021-03-02
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

The existing energy storage system control strategy only simply compensates the power output curve of the photovoltaic power station, and does not have an accurate photovoltaic power generation output prediction model. Using off-line methods to control the photovoltaic power station and energy storage will produce large deviations. The configured energy storage The system capacity has not been optimized, and at the same time, the deep charge and discharge of energy storage affects its service life

Method used

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  • A control method for energy storage to suppress rapid power changes of photovoltaic power plants
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  • A control method for energy storage to suppress rapid power changes of photovoltaic power plants

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] Such as figure 1 As shown, the topological structure of the combined system of photovoltaic power station and energy storage in the present invention is: including photovoltaic array, energy storage system, two converters, a transformer and an MPC (model predictive control) controller, photovoltaic array and energy storage The energy systems are respectively connected to the AC bus through the converter, and then connected to the power grid through the transformer. The active power input to the grid is the sum of the output power of the photovoltaic array and the energy storage system. The MPC controller receives the scheduling data of the power grid's output of photovoltaic power plants, the prediction data of the prediction model, and the constraint data of the energy storage battery, and brings these data into the optimization model, uses the metho...

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Abstract

The present invention provides a control method for energy storage to suppress rapid power changes of a photovoltaic power station. The method includes the following steps: (1) receiving the active power of the power grid, the dispatch data of the output of the photovoltaic power station, the prediction data of the prediction model, and the data of the energy storage system Constrain the data; (2) Establish a photovoltaic prediction model and predict the output of photovoltaics; (3) Solve the objective function using the method of chance constraints to obtain the output value of the energy storage system; (4) Control the output power of the energy storage system, Suppress fluctuations generated by photovoltaic arrays. The invention realizes a good effect of suppressing the power fluctuation of the photovoltaic power station, reduces the system cost, and improves the stability of the photovoltaic power station connected to the power grid.

Description

technical field [0001] The invention relates to a control method for controlling power changes of a photovoltaic power station, in particular to a control method for energy storage to suppress rapid power changes of a photovoltaic power station. Background technique [0002] With the rapid development of photovoltaic power generation technology and the promulgation of various national policies, the installed capacity of photovoltaic power generation in my country has continued to increase. The National Energy Administration announced that the cumulative installed capacity of photovoltaic power generation in 2014 was 28.05 million kilowatts, of which photovoltaic power stations were 23.38 million kilowatts and distributed photovoltaics were 467. Ten thousand kilowatts. Most of these photovoltaic power plants are located in Northwest China and Tibet, which are rich in light resources, and photovoltaic power generation is affected by weather conditions with great uncertainty, an...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/28G06F30/27
CPCG06F30/367H02J3/383H02J3/28Y02B10/10Y02E10/56Y02E70/30
Inventor 李建林张德隆田立亭惠东李春来
Owner CHINA ELECTRIC POWER RES INST
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