Determination method of power grid loss power shedding load based on linear interpolation method

A linear interpolation method, a technology of power grid loss, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of load loss, failure to consider system capacity, operating frequency of primary frequency regulation adjustable amount, etc., to achieve the effect of avoiding load loss

Active Publication Date: 2022-03-15
NORTHEAST ELECTRIC POWER DESIGN INST CO LTD OF CHINA POWER ENG CONSULTING GRP +1
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Problems solved by technology

The load shedding in this method does not take into account the system capacity, the adjustable amount of primary frequency regulation, and the influence of the operating frequency before the system loses power. In order to ensure that the measures work reliably, the load shedding is generally much larger than the required load shedding, causing unnecessary load loss

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  • Determination method of power grid loss power shedding load based on linear interpolation method
  • Determination method of power grid loss power shedding load based on linear interpolation method

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specific Embodiment approach

[0013] refer to figure 1 , the specific embodiment of the present invention comprises the following steps:

[0014] 1. Determine the maximum / minimum generating power of the system within a certain period of time (such as a year) according to the seasonal and daily variation of the system load and the load forecast. Set the system generating power to several power values ​​on average from small to large, represented by S1 (minimum generating power), S2, S3...Sn (maximum generating power); according to the primary frequency regulation parameters of the units in the system and possible operation Working conditions, determine the possible primary frequency regulation forward adjustable power range of the system, and set the system’s primary frequency regulation forward adjustable power range from small to large on average to several adjustable power values, respectively with ST1 (possible minimum primary frequency regulation Forward adjustable power), ST2, ST3...STm (possible max...

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Abstract

A method for determining load shedding of power grid loss power based on linear interpolation method, the steps are: (1) Combining each set value of power generation and primary frequency modulation forward adjustable power, and each combination forms a system operation mode ;(2) According to the system operation mode formed by each combination, calculate the power loss when the system runs at the rated frequency, the highest frequency and the lowest frequency, and the system frequency drops to a certain set minimum frequency due to the loss of power supply Power value; (3) Use the linear interpolation method to calculate the power supply power value lost when the system frequency drops from the rated frequency, the highest frequency, and the lowest frequency to the set minimum frequency under the current system state; (4) Use the linear interpolation method , to calculate the allowable power loss value of the system when the current frequency drops to the set minimum frequency. When the allowable power loss value is less than the actual power loss value, the difference is the load to be shed. The invention can accurately determine the required load shedding quantity and avoid unnecessary load loss.

Description

technical field [0001] The invention belongs to the field of safety and stability control of electric power systems, and relates to a method for determining load removal after a power grid loses power based on a linear interpolation method. Background technique [0002] During the operation of the power system, it is required to match the output power of the power supply with the power consumption of the load in real time to maintain the operation of the power system at the rated frequency. When the power system suddenly loses part of the power during operation, it will cause the system frequency to drop. After the system frequency is reduced, the generators and loads in the system are adjusted according to their own frequency characteristics, the generators increase their output, and the loads reduce their consumption. When the amount of power loss is small, the system frequency can be maintained within the allowable range through the adjustment of the generator and load a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 张嵩余加喜张宇毛李帆张忠华姜伟明吴锋郭佳王建华
Owner NORTHEAST ELECTRIC POWER DESIGN INST CO LTD OF CHINA POWER ENG CONSULTING GRP
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