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Energy storage system control strategy oriented to power grid AGC frequency modulation

An energy storage system and control strategy technology, applied in the direction of circuit devices, AC network circuits, AC network load balancing, etc., can solve the problems of limiting the frequency modulation characteristics of the energy storage system and affecting the regulation performance of the energy storage system, and achieve a scientific and reasonable method. Strong applicability and the effect of preventing overcharge and overdischarge

Active Publication Date: 2017-08-18
NORTHEAST DIANLI UNIVERSITY +1
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AI Technical Summary

Problems solved by technology

[0003] The energy storage system has fast charging and discharging capabilities, can dynamically absorb energy and release it in a timely manner, so it can accurately and quickly respond to the frequency regulation command of the power grid, and ensure the safe operation of the power system while increasing the penetration of new energy in the power grid. Therefore, designing a reasonable AGC control method for the energy storage system to respond to the grid is of great significance to the frequency adjustment of the high wind power penetration grid.

Method used

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  • Energy storage system control strategy oriented to power grid AGC frequency modulation
  • Energy storage system control strategy oriented to power grid AGC frequency modulation
  • Energy storage system control strategy oriented to power grid AGC frequency modulation

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Embodiment Construction

[0034] The control strategy of the energy storage system oriented to grid AGC frequency modulation of the present invention will be further described below using the drawings and embodiments.

[0035] This example takes a provincial power grid as an example, selects the AGC data with a sampling interval of 1min, and takes the grid structure of the province as the research object, the frequency response coefficient B is -172.5MW / 0.1Hz, and the time scale of the simulation calculation is 1 months; due to the advantages of high density, high efficiency and long service life of lithium-ion batteries, lithium-ion batteries are used in the energy storage system; the rated capacity and power of the lithium-ion battery energy storage system are set to 50MWh and 100MW respectively, and the charging and discharging The efficiency is 90%.

[0036] The calculation parameters of the embodiment are described as follows:

[0037] Table 1 Simulation parameters of lithium battery energy stora...

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Abstract

The invention relates to an energy storage system control strategy oriented to power grid AGC frequency modulation, characterized by comprising the following steps of battery energy storage involving in AGC frequency modulation structure design and of SOC layered control strategy. According to the invention, starting from the perspective of power grid AGC frequency modulation control, safety factors are designed for the battery energy storage operation cycle; the energy storage system's capacity and power restriction are fully considered; through the energy management to the energy storage system and based on the SOC layered control strategy, the power charging and discharging frequency modulation power for the energy storage system is determined, which means that while the power grid frequency becomes more stable, the energy storage system is steered clear of excessively charging and discharging. The method of the invention is scientific and reasonable. With strong practicability, the method can also achieve good performances.

Description

technical field [0001] The invention relates to the technical field of power grid AGC frequency modulation, and is an energy storage system control strategy oriented to power grid AGC frequency modulation. Background technique [0002] In recent years, China's new energy power generation has developed rapidly. As of the end of 2016, China's wind power grid-connected installed capacity reached 150 million kilowatts, and the cumulative installed photovoltaic capacity was 77.42 million kilowatts. With the development of new energy, some regions in China, such as Gansu, Ningxia, Xinjiang and other new energy sources, including wind power / photovoltaic installed capacity, account for more than 30% of local power installed capacity; large-scale new energy access replaces some traditional power sources, reduces the inertia of the entire system, and seriously threatens the frequency stability of the power grid. [0003] The energy storage system has fast charging and discharging capa...

Claims

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Application Information

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IPC IPC(8): H02J3/32H02J3/06H02J3/24
CPCH02J3/008H02J3/06H02J3/24H02J3/32H02J2203/20
Inventor 李军徽范兴凯穆钢严干贵邢志同
Owner NORTHEAST DIANLI UNIVERSITY
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