Optimization method for improving safety and stability of grid frequency

Abstract

The invention discloses an optimization method for improving safety and stability of grid frequency. The optimization method comprises the following steps of: determining a grid size, grid characteristics, an operation mode and a setting condition of a safety and stability control device of a target power system; determining whether the risk that the grid frequency is out of limit exists after a grid fails; implementing a measure for cutting off a pumped storage power station unit; determining a control measure for power of a speed-up or speed-down direct current line; and selecting starting frequency of the power of the speed-up or speed-down direct current line and determining speed-up or speed-down regulating quantity for power of the direct current line through simulating calculation. According to the optimization method, the frequency stability of the grid after failure is improved by using the control measure for the direct current line and a pumped storage power station, the direct current adjustable capacity and the pumped storage power station in the system can be effectively utilized, the frequency maintenance level of the system after failure is improved, the safety and stability control measures such as cut-off of a power set and load shedding are reduced, and the influence of the failure of the power system on power operation, industrial production and life of people is reduced.

Description

technical field

[0001] The invention belongs to the field of power systems, and in particular relates to an optimization method for improving the safety and stability of power grid frequency by using a direct current line and a pumped storage power station. Background technique

[0002] One of the important symbols of the stable operation of the power system is the stability of the system frequency. Frequency stability refers to the ability of the system frequency to maintain or recover within the allowable range without frequency collapse after active power disturbances occur in the power system. If the frequency instability occurs in the system, it will lead to a large-scale power outage with serious consequences. With the development of power system power generation and transmission technology, the maximum capacity of a single unit has reached 1 million kilowatts, the transmission capacity of a single UHV AC line has reached 5 million kilowatts, and the transmission capa...

Examples

Embodiment Construction

[0040] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] The following takes the optimization of the frequency stability of the Central China-North China power grid after the failure of the 1000kV UHV AC tie line (hereinafter referred to as the Changnan Line) as an example to describe in detail. Such as figure 2 As shown, the specific steps of the optimization method include:

[0042] Step (1): Determine the grid scale, grid characteristics, operation mode and setting of safety and stability control devices of the target power system. The power grids studied in this embodiment include power grids in three large regions: Central China, North China, and East China. Under the typical operation mode at the end of 2011, the load of the central China power grid was about 90 million kilowatts, the load of the north China power grid was about 120 million kilowatts, and the l...

technical field

[0001] The invention belongs to the field of power systems, and in particular relates to an optimization method for improving the safety and stability of power grid frequency by using a direct current line and a pumped storage power station. Background technique

[0002] One of the important symbols of the stable operation of the power system is the stability of the system frequency. Frequency stability refers to the ability of the system frequency to maintain or recover within the allowable range without frequency collapse after active power disturbances occur in the power system. If the frequency instability occurs in the system, it will lead to a large-scale power outage with serious consequences. With the development of power system power generation and transmission technology, the maximum capacity of a single unit has reached 1 million kilowatts, the transmission capacity of a single UHV AC line has reached 5 million kilowatts, and the transmission capa...

Examples

Embodiment Construction

[0040] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] The following takes the optimization of the frequency stability of the Central China-North China power grid after the failure of the 1000kV UHV AC tie line (hereinafter referred to as the Changnan Line) as an example to describe in detail. Such as figure 2 As shown, the specific steps of the optimization method include:

[0042] Step (1): Determine the grid scale, grid characteristics, operation mode and setting of safety and stability control devices of the target power system. The power grids studied in this embodiment include power grids in three large regions: Central China, North China, and East China. Under the typical operation mode at the end of 2011, the load of the central China power grid was about 90 million kilowatts, the load of the north China power grid was about 120 million kilowatts, and the l...

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