Peak load shaving lever control method based on battery energy storage

A technology of peak shaving and valley filling and lever control, applied in the field of power grid, can solve the problems of increasing the capacity of backup units, energy waste, insufficient peak shaving capacity of new energy power generation, etc., to save energy, improve the capacity of peak shaving and valley filling, and reduce backup The effect of capacity

CN109378843AActive Publication Date: 2019-02-22STATE GRID LIAONING ELECTRIC POWER RES INST +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-02-22

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Abstract

The invention belongs to the technical field of power grids, and in particular relates to a peak load shaving lever control method based on battery energy storage. In a large number of storage battery-mounted power grid systems, a storage battery not only serves to store electrical energy, but also plays an irreplaceable role in alleviating peak load regulating of the power grids. The method includes the following steps: performing modeling on its own energy storage state of the storage battery; calculating reduced power generation capacity during a low valley period; calculating a lifted lowvalley value at a low valley moment; and calculating peak-shaving capacity, and overall peak load shaving capability in a system with rated storage energy power and capacity of the storage battery. Through control of a difference in power generation capacity at different stages and load conditions, charging and discharging time are calculated, the charging and discharging time are controlled to achieve a lever form, less battery storage energy is utilized to achieve a function of peak load shaving to a great extent, and so, under the premise of reducing the spare capacity of a unit, the reliability of power supply can be ensured, a lot of energy is saved, the peak load shaving capacity of the power grids is improved, a peak-to-valley difference is reduced, and the control of the power grids is more stable and reliable.
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Description

technical field

[0001] The invention belongs to the technical field of power grids, and in particular relates to a control method for peak-shaving and valley-filling levers based on battery energy storage. In the power grid system where a large number of batteries are installed, the battery not only fulfills the requirement of storing electric energy, but also plays an irreplaceable role in alleviating the peak shaving of the power grid. Background technique

[0002] In the current power system where multi-energy power generation is continuously connected to the grid, traditional generator sets are not capable of peak regulation for current new energy power generation. In order to ensure the safe operation of the power grid, the main method adopted in the current power grid When the load in the grid is at a peak time, all the units are put into the grid to ensure the reliability of power consumption of the grid. However, when the load is in a low period, due to the large num...

Examples

Embodiment 1

[0058] The present invention is a peak-shaving and valley-filling lever control method based on battery energy storage. The peak-shaving and valley-filling lever model of battery energy storage is established by using the battery peak-shaving technology, including the following steps:

[0059] Step 1: Suppose the energy storage capacity of the battery is Q=10000MW.h, the overload capacity of all transformers in the power system is 20%, and the energy storage power of the battery is P=500MW under normal circumstances. Grid load peak time maintenance time Δt 1 =2.7h, the average power P of the load in the grid at the peak time j =5000MW, then the thermal power standby unit P that can be reduced by energy storage power generation at peak times 1 Calculated as the following formula, the time t when the power grid peak occurs jf0 =8.5, the time when the battery is connected to the grid Calculated as follows, where [Δt 1 ] for no more than Δt 1 largest integer of . First, cal...