Optimal configuration method of energy storage equipment capacity in island mode of regional power grid with 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 capacity field of energy storage equipment, and more specifically, relates to a method for optimally configuring the capacity of energy storage equipment in the island mode of a regional power grid containing DG (distributed power supply). Stable operation and economical issues in grid island mode, to avoid depletion or saturation of energy storage equipment capacity. Background technique [0002] In the case of permanent faults, when the distribution network including Distributed Generation (DG) is in the island operation mode, the island operation of the system can be realized by regulating the distributed generation and meeting the power supply quality and load requirements. In the island operation mode, the energy storage device is used as the main control unit to conduct comprehensive regulation according to the photovoltaic output, wind turbine output and load conditions, and rely on the energy storage device ...

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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