Photovoltaic power stable output control method based on energy storage operation state

Abstract

The invention discloses a photovoltaic power stable output control method based on an energy storage operation state. The method comprises the steps that S1 the research object time window length y and the running data P(t) are selected; S2 an expected output target value PG is determined based on an optimal power output model; S3 the particle swarm dimension D, the maximum number of iterations Mmax and the convergence accuracy C sigma are set, and at the same time the particle group position x and the velocity v are initialized; S4 according to a charge and discharge strategy, the fitness value pxid of each particle is calculated; the particle extremum pi and the global particle extremum pg are compared; if the fitness value is small, pi and pg are updated, otherwise the particle velocity Vid and the position Xid are updated; and S5 delta sigma 2 is calculated; whether a convergence condition described in the description is satisfied is determined; if so, the best storage capacity WO is acquired; if not, particles are re-released to set up a new group, and the step S4 is repeated. According to the invention, the grid-connection power fluctuation can be effectively stabilized, and at the same time the charging state of an energy storage system can be accurately adjusted.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a method for controlling the stable output of photovoltaic power based on the energy storage operating state. Background technique [0002] As an important part of the national energy strategy, photovoltaic power generation has developed rapidly in recent years, delivering a large amount of clean energy to the grid. However, due to its inherent volatility, intermittent and uncontrollable characteristics, while the installed capacity and penetration rate of photovoltaic power generation systems continue to increase, it also brings many negative effects to the safe and stable operation of the power system, such as poor peak-shaving capabilities , The impact on the power grid is large, and the spinning reserve capacity needs to be increased. Therefore, installing a certain-capacity energy storage system for the photovoltaic field can effectively stabilize the ...

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Problems solved by technology

[0010] The above research has considered the fluctuation of the grid-connected power of the photovoltaic power station, but has not considered the influence of the operating state of the energy storage body on the fluctuation of the photovoltaic power, which makes the above method have a relatively large demand for energy storage capacity.

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