Method for achieving optimal configuration of capacity of energy storage equipment in islanding mode of regional power grid comprising DG

Abstract

The invention discloses a method for achieving optimal configuration of the capacity of energy storage equipment in the islanding mode of a regional power grid comprising a DG. The method comprises the steps of monitoring output power data and load data of the DG at each time point, and fitting the probability distribution function of the output power data and the probability distribution function of the load data respectively; establishing a control strategy for charging and discharging of the energy storage equipment, and obtaining a control rule for the output power of the energy storage equipment; establishing the dynamic semi-invariant of the DG and the load, and obtaining the probability distribution of the charging and discharging power of the energy storage equipment; establishing a configuration optimization model with the minimization of the capacity of the energy storage equipment as the target and the charged state of the energy storage equipment as the inequality constraint condition, and working out the configuration capacity of the energy storage equipment. According to the method, the dynamic semi-invariant is introduced to constrain the probability distribution of the output power of the energy storage equipment within a certain confidence coefficient, the control strategy for the charging and discharging power of the energy storage equipment is introduced to guarantee that the energy storage equipment does not operate in the depleted state or the saturated state for a long time and the capacity of the energy storage equipment is fully utilized, and therefore the power quality and the economy can be guaranteed in the islanding mode of the regional power grid.

Description

Technical field [0001] The present invention relates to the field of energy storage equipment capacity, and more specifically, to a method for optimizing the configuration of energy storage equipment capacity under DG (distributed power supply) regional grid island mode. The method is particularly suitable for troubleshooting areas containing distributed power sources. Stable operation and economic problems in the grid island mode can avoid the depletion or saturation of energy storage equipment. Background technique [0002] In the case of permanent faults, when the distribution network with distributed generation (DG) is in island operation mode, the distributed power supply is regulated and controlled, and the system is isolated on the premise of meeting the power supply quality and load demand. In island operation mode, the energy storage device is used as the main control unit to perform comprehensive regulation based on photovoltaic output, wind turbine output and load cond...

AI Technical Summary

Problems solved by technology

At present, the same probability distribution characteristic is used to describe the distributed power output and load changes, but the actual DG output and load fluctuation characteristics will change dynamically with time, and the probability characteristics at each moment may be different

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