A combined energy storage discharge method for maintaining frequency stability of a power grid

A grid frequency and combined energy storage technology, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of limited and insufficient energy storage capacity of supercapacitors and flywheels, and solve the problem of limited flywheel energy storage capacity and avoid The effect of reduced lifespan

Inactive Publication Date: 2018-12-21
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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AI Technical Summary

Problems solved by technology

[0003] The invention provides a combined energy storage method for maintaining the grid frequency stability, which solves the problem of limited capacity of supercapacitor and flywheel energy storage, and insufficient capacity when charging and discharging for a long time is required

Method used

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Embodiment Construction

[0011] The present invention will be described in detail below:

[0012] A combined energy storage and discharge method for keeping the grid frequency stable, including the following steps:

[0013] The first step is to select a flywheel energy storage device with a maximum charge and discharge power of 3-4 MW and a capacity of 90-120 MW seconds;

[0014] The second step is to select a battery energy storage device with a maximum charge and discharge power of 10% of the power supply or grid rated power. The capacity requirement of the energy storage device is: the maximum charge and discharge power can last for 15 minutes when charging and discharging energy;

[0015] The third step is to connect the flywheel energy storage device and battery energy storage device selected in the above two steps in parallel to the grid, and the electric energy storage of the two energy storage devices should be maintained at about 50% of their rated capacity;

[0016] Step 4. When the unbalanced frequen...

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Abstract

The invention discloses a combined energy storage and discharge method for maintaining the frequency stability of a power network, which solves the problem that the energy storage capacity of a supercapacitor and a flywheel is limited and the capacity is insufficient when charging and discharging for a long time is required. The method comprises selecting a flywheel energy storage device; selecting a storage battery energy storage device; after connecting the flywheel energy storage device and the battery energy storage device in parallel to the power grid, the electric energy storage of the two energy storage devices should be kept at about 50% of their rated capacity. When the unbalanced frequency of power supply and demand decreases, that is, when the power consumption is greater than the power generation, first starting the flywheel energy storage device to discharge; If the frequency of the power grid has been balanced before the power margin exceeds 2-3 seconds, terminating thedischarge of the flywheel energy storage device; If, the grid frequency is not balanced before the flywheel energy storage device of the remaining power capacity of 2-3 seconds, , then startting the battery energy storage device discharge to ensure the continuity of the discharge for the grid frequency modulation.

Description

Technical field [0001] The invention relates to a combined energy storage method of a battery, a flywheel energy storage, and a super capacitor, in particular to a combined energy storage method for maintaining the stability of the grid frequency in terms of power system frequency modulation, peak regulation and ACE adjustment. Background technique [0002] Wind power and photovoltaic power generation use wind and solar energy as energy sources respectively, and natural resources such as wind and solar energy are easily affected by the environment and climate, making the power of wind power and photovoltaic power generation intermittent, uncertain and volatile Features. As wind power and photovoltaic power generation are connected to the grid on a large scale, their impact on the safe and stable operation of the grid cannot be ignored. For these intermittent energy sources, the power output changes drastically. When the installed capacity increases to a certain scale, its power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/32H02J3/30
CPCH02J3/30H02J3/32H02J3/241Y02E60/16
Inventor 郭强薛志伟田亮白志刚王浩霖韩国强武杰荀康
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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