Power system minimum startup mode optimization method based on on-line calculation

A startup method and power system technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as long review cycles, reduce the number of startup units, reduce spinning reserve capacity, and improve flexibility and power supply.

Active Publication Date: 2020-12-11
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The review cycle is longer, usually once every six months

Method used

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  • Power system minimum startup mode optimization method based on on-line calculation
  • Power system minimum startup mode optimization method based on on-line calculation
  • Power system minimum startup mode optimization method based on on-line calculation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] If the maximum load on a certain day is predicted to be 21 million kilowatts, in order to ensure the consumption of clean energy, the thermal power unit is usually started with one more unit on the basis of the minimum number of units required for the maximum DC power to ensure that any thermal power unit fails to trip After that, it will not affect the transmission power of DC. According to the requirements in Table 1, 19 thermal power units will be operated on that day, and the maximum DC transmission power can reach 4 million kilowatts.

[0036] If the actual load on that day exceeds the predicted load by 21.5 million kWh due to the high temperature, according to the requirements in Table 1, under this load level, when the minimum power-on of thermal power units in the load center is 19 units, the maximum power of DC transmission is only 3 million kilowatt. Therefore, it is necessary to reduce the DC transmission power from 4 million kilowatts to 3 million kilowatts...

Embodiment 2

[0039] If the load level of the provincial power grid reaches 31 million kilowatts during a peak load period, the DC transmission power is 4 million kilowatts, and the power supply pressure is relatively high. According to Table 1, the minimum number of thermal power units in the load center is 24, and the minimum rotating reserve capacity is 3 million kilowatts.

[0040] The method for optimizing the minimum start-up mode of the present invention is used to obtain real-time operation status data and model parameters of the power grid to form online calculation data for the power grid, to check the minimum start-up mode of the power grid at this time, and to evaluate whether the minimum start-up mode obtained by off-line calculation has room for optimization. If the minimum spinning reserve capacity can be reduced from 3 million kilowatts to 2.7 million kilowatts at this time, the output of the limited unit can be increased by 300 thousand kilowatts, thereby increasing the powe...

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PUM

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Abstract

The invention discloses a power system minimum startup mode optimization method based on online calculation, which comprises the following steps: real-time operation state data and model parameters ofa power grid are obtained to form online calculation data of the power grid; the number of initial simulation shutdown generator sets and simulating the initial value of the spinning reserve capacitycoefficient are set; according to the method, a specific number of generator sets are stopped in sequence, and safety and stability evaluation is performed: if the safety and stability requirements are met, the number of the stopped generator sets is updated, and the step is repeated, so that the starting number of the minimum starting mode calculated online is determined; and the spinning reserve capacity of the generator set is simulated and reduced in proportion, and safety and stability evaluation is carried out: if the safety and stability requirements are met, the spinning reserve capacity is updated and simulated to be reduced, and the step is repeated, so that the spinning reserve capacity of each started generator set is determined. The constraint of the minimum startup mode determined by offline calculation on the generator set can be reduced, and the flexibility and the power supply capability of the power grid operation mode are improved.

Description

technical field [0001] The invention belongs to the technical field of power grid dispatching operation control, and in particular relates to an online calculation-based optimization method for a minimum start-up mode of a power system. Background technique [0002] When the load in a certain area increases to a certain extent, in order to maintain the voltage at the load point within the specified range, it is usually necessary to maintain a certain number of start-up units and spinning reserve capacity, which is the origin of the minimum start-up mode of the regional power grid. With the application and development of UHV DC transmission technology, the power of DC transmission is increasing, and its impact on the connected AC grid is becoming more and more obvious. Mainly manifested as UHV DC blocking or large disturbances in the AC grid, the sending-end AC grid will cause high-frequency, high-voltage and even generator power angle stability problems due to power surplus,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/46
CPCH02J3/466H02J2203/20
Inventor 呙虎陈道君王玎柳永妍崔挺左剑杨丹
Owner STATE GRID HUNAN ELECTRIC POWER
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