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Control method for stabilizing photovoltaic output power fluctuation of energy storage device

An energy storage device and output power technology, applied in photovoltaic power generation, circuit devices, reducing/preventing power oscillation, etc., to achieve the effect of improving the stabilization effect, optimizing system performance and system economy, and improving the utilization rate of predicted data

Active Publication Date: 2019-07-30
PINGYANG ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER +2
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Problems solved by technology

If the PV output forecast values ​​at all times are treated equally, it is obvious that the effectiveness of the forecast data has not been maximized

Method used

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  • Control method for stabilizing photovoltaic output power fluctuation of energy storage device
  • Control method for stabilizing photovoltaic output power fluctuation of energy storage device
  • Control method for stabilizing photovoltaic output power fluctuation of energy storage device

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Embodiment Construction

[0064] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0065] Energy storage device to stabilize photovoltaic output power fluctuation system such as figure 1 As shown, it consists of four parts: photovoltaic power generation device, energy storage device, prediction system and control system. The control system receives the photovoltaic power prediction data from the prediction system and the power feedback of the photovoltaic power generation system, and optimizes the power command of the photovoltaic system at the next moment through the model predictive control algorithm, and transmits it to the photovoltaic system output. The specific optimization control method is described as follows.

[0066] The objective ...

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Abstract

The invention discloses a control method for stabilizing photovoltaic output power fluctuation of an energy storage device. According to a characteristic of different photovoltaic prediction accuracies in different time periods, on the basis of constructing model prediction control constraints according to photovoltaic prediction data in all time periods, constraints based on the photovoltaic prediction data in two short-term time periods are additionally constructed, so that the utilization rate of the photovoltaic prediction data with higher accuracy is improved. At the same time, an objective function which is used to comprehensively consider the photovoltaic output power fluctuation satisfaction rate and the energy storage service lifetime loss is established for prediction control. Byadopting the two-stage model prediction control method, the stabilizing effect of the energy storage device on the photovoltaic fluctuation can be effectively improved. By adopting the method, the impact of large-scale photovoltaic grid-connected power fluctuation on the power system can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of energy storage control, in particular to a control method for an energy storage device to stabilize photovoltaic output power fluctuations. Background technique [0002] In recent years, with the increasing requirements for energy conservation, emission reduction and control of greenhouse gas emissions, renewable energy represented by photovoltaics and wind turbines has been connected to the grid on a large scale. Compared with traditional synchronous units, the output of renewable energy is less predictable and often fluctuates violently, which brings huge challenges to the operation of the power grid. Restricting the output of renewable energy is a commonly used method to reduce its impact on the grid. However, this power-limiting method reduces the total amount of renewable energy generation and sacrifices system economics. [0003] With the rapid decline in the cost of electrochemical energy storage component...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38H02J3/32
CPCH02J3/383H02J3/24H02J3/32H02J2203/20Y02E70/30
Inventor 戴瑞海林厚飞马帮文金建新支秉忠黄益宏李健林启待施亦治
Owner PINGYANG ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER
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