Hybrid energy storage output control method and system for stabilizing peak-valley difference of power grid

Abstract

The application relates to a hybrid energy storage output control method and system for stabilizing the peak-valley difference of a power grid, and aims at the problem that the expected value of charge and discharge power of a hybrid energy storage system does not consider the peak and valley of load. The method includes the following steps: first, the measured power of a hybrid energy storage system for peak load shifting is detected and collected in real time, and the expected value of charge and discharge power of the hybrid energy storage system is calculated by adopting a quadratic exponential smoothing algorithm and considering a peak-valley factor; and then, the output of a super capacitor and a lithium battery is determined according to the change of the expected value of charge and discharge power of the hybrid energy storage system, and is optimized by a global parallel optimization algorithm. The method of the invention combines the peak-valley factor, a variable-coefficientexponential peak load shifting method, a non-linear state observation method and the global parallel optimization algorithm, and provides effective reference for the capacity configuration of the energy storage system.

Description

technical field

[0001] The present application belongs to the technical field of grid hybrid energy storage, and in particular relates to a hybrid energy storage output control method and system for smoothing the peak-valley difference of the grid. Background technique

[0002] With the intensification of global traditional energy shortage and the vigorous promotion of clean energy policies around the world, under the dual pressures of energy demand and environmental protection, the application of distributed renewable energy such as solar energy and wind energy has attracted more and more attention from all countries. However, a large number of distributed power sources are connected to the distribution network, and the randomness and uncertainty of their output have brought new problems to the safe operation of the distribution network. The new energy represented by wind power is profoundly changing the world's power and energy structure. However, the uncertainty, randomne...

Examples

Embodiment Construction

[0097] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0098] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0099] Embodiment of control method

[0100] This embodiment provides a hybrid energy storage system output control method for smoothing the peak-to-valley difference of the power grid, such as figure 1 shown, including:

[0101] Step 1, real-time acquisition of the measured power P of the hybrid energy storage system for peak shaving and valley filling bess,t , to calculate the measured power P bess,t and the set deviation value ΔP(t) of the power value that satisfies the requirements for stabilizing the peak-valley difference of the power grid, and compares the deviation value ΔP(t) with the set peak-valley difference limit value Det to obtain the pe...

technical field

[0001] The present application belongs to the technical field of grid hybrid energy storage, and in particular relates to a hybrid energy storage output control method and system for smoothing the peak-valley difference of the grid. Background technique

[0002] With the intensification of global traditional energy shortage and the vigorous promotion of clean energy policies around the world, under the dual pressures of energy demand and environmental protection, the application of distributed renewable energy such as solar energy and wind energy has attracted more and more attention from all countries. However, a large number of distributed power sources are connected to the distribution network, and the randomness and uncertainty of their output have brought new problems to the safe operation of the distribution network. The new energy represented by wind power is profoundly changing the world's power and energy structure. However, the uncertainty, randomne...

Examples

Embodiment Construction

[0097] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0098] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0099] Embodiment of control method

[0100] This embodiment provides a hybrid energy storage system output control method for smoothing the peak-to-valley difference of the power grid, such as figure 1 shown, including:

[0101] Step 1, real-time acquisition of the measured power P of the hybrid energy storage system for peak shaving and valley filling bess,t , to calculate the measured power P bess,t and the set deviation value ΔP(t) of the power value that satisfies the requirements for stabilizing the peak-valley difference of the power grid, and compares the deviation value ΔP(t) with the set peak-valley difference limit value Det to obtain the pe...

Images