Control method for stabilizing wind and light output power fluctuation through hybrid energy storage system

Abstract

The invention provides a control method for stabilizing wind and light output power fluctuation through a hybrid energy storage system. The control method is characterized in that a super capacitor and a storage battery complement each other to conduct two-level stabilizing on wind and light output power, the same algorithm is adopted in two levels of stabilizing, required smooth wind and light output power, surplus capacity of an energy storage element and other data are collected and analyzed, an expectation value of the wind and light output power is calculated, and meanwhile the wind and light power fluctuation and the electrical charge state of the energy storage element are considered to conduct optimizing control on a mobile step size; finally, deviation between a wind and light output power actual value and the expectation value serves as the stabilizing target of the energy storage element, charging and discharging of an energy storage unit are controlled, and smoothness of the wind and light output power is achieved. On the basis that the highest power output of wind electricity and photoelectricity can be kept, by flexibly and rapidly controlling the storage battery and the super capacitor, stabilization of the wind and light power fluctuation is achieved, electricity energy quality is effectively improved, and the energy using ratio and admitting ability for renewable energy sources of a power grid are improved.

Description

technical field [0001] The invention relates to a control method for a hybrid energy storage system to stabilize wind and solar output power fluctuations, and belongs to the field of power quality. Background technique [0002] In consideration of primary energy depletion and environmental protection, the development of renewable energy is regarded as an important strategy worldwide. In recent years, the installed capacity of wind power and photovoltaics in my country has increased significantly, while the growth of grid-connected power generation has been slow. The reason is that the randomness and volatility of wind and solar energy pose a huge challenge to wind power grid-connected consumption. Adjusting distributed power itself can reduce the output fluctuation of distributed power to a certain extent, but at the same time it also reduces the effective utilization rate of renewable energy; the rapid development of energy storage technology provides a new idea for smoothi...

AI Technical Summary

Problems solved by technology

Adjusting distributed power itself can reduce the output fluctuation of distributed power to a certain extent, but at the same time it also reduces the effective utilization rate of renewable energy; the rapid development of energy storage technology provides a new idea for smoothing the fluctuation of wind power and photovoltaic output power , on the basis of not affecting the maximum power tracking of wind energy and solar energy, the wind and solar output can be adjusted "over time", reducing the fluctuation of wind and solar output, improving the stability of the power grid and the ability to accept renewable energy

Images