A capacity configuration method for energy storage system based on adjusting battery state of charge

Abstract

The invention relates to an energy storage system capacity allocation method based on battery charge state adjustment. The method is characterized by including the steps of definition of wind power forecast errors, definition of a forecast error allowable fluctuation interval, definition of forecast error precision, definition of the annual utilization rate of an energy storage system, additional arrangement of a wind electric field unit and energy storage system united force outputting system with a resistive load, partitioning of the energy storage system, partition control rule making for the energy storage system, determination of an improved energy storage capacity collocation method and determination of parameters used in the energy storage capacity collocation method. The energy storage system capacity allocation method based on battery charge state adjustment is scientific and reasonable, the battery charge state adjustment of the energy storage system can be achieved, the charge state of an energy storage battery can recover quickly from adverse influence caused by discharging, the energy storage battery can keep in a high level and prepares for next discharging, the energy storage capacity is substantially lowered, target needs can be well tracked, and the method plays a good guiding role in planning the energy storage capacity at the earlier stage.

Description

technical field [0001] The invention is a method for configuring the capacity of an energy storage system based on adjusting the state of charge of a battery. Background technique [0002] Under the background of energy shortage, wind power, as a clean energy, has been paid more and more attention by more and more countries. The installed capacity of wind power in China has increased year after year. By the end of 2013, the installed capacity of wind power in China had reached 91412.89MW. With the continuous expansion of wind power grid-connected scale, wind power brings new challenges to power system dispatching due to its uncertainty. As an important means to meet challenges and resolve contradictions, wind power forecasting has attracted the attention and research of many scholars in recent years, and the accuracy of its forecasting has been greatly improved. The prediction accuracy cannot be very high. For this reason, many scholars have proposed to add an energy storag...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to make substantive improvements and innovations to the problems existing in the existing energy storage capacity configuration method that do not consider the adjustment of the battery charge state and the configuration capacity is too large, and constructively propose a A wind power grid-connected model with a resistive load is added here, and a small amount of local use of electric energy is exchanged for a large reduction in the capacity configuration of the energy storage system, and a method for capacity configuration of the energy storage system based on adjusting the state of charge of the battery is proposed. This method can keep the state of charge of the energy storage system as high as possible, and can greatly reduce the configuration capacity

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