Optimization method for capacity calculation of black-start diesel units in thermal power plants and start-up sequence of plant loads

Abstract

The present invention provides an optimization method for the capacity calculation of black-start diesel units in thermal power plants and the start-up sequence of plant loads. Capacity Se1; Step S2, use the particle swarm optimization algorithm to optimize the start-up sequence of the plant loads, and obtain the total capacity Se2 of the plant loads corresponding to the optimized start-up sequence; Step S3, take the larger value of Se1 and Se2 as the diesel engine Set capacity Se; simulate the voltage drop of the service bus when the maximum capacity service load is started. When the bus voltage drop ΔV is greater than the set condition ΔVset, gradually increase the diesel unit capacity Se=Se+ΔSe until the bus voltage drop meets the requirements; based on this, the optimal calculation capacity of the diesel unit is determined to be Se. The invention can reduce the cost of the thermal power plant equipped with diesel units on the basis of ensuring the normal start-up of the plant load.

Description

technical field [0001] The invention belongs to the technical field of electric power supply, in particular to an optimization method for the capacity calculation of black-start diesel generating units in thermal power plants and the starting sequence of plant loads. Background technique [0002] Due to the high interconnection of the current power grid and the influence of various uncertain factors, the power system blackout accident is almost unavoidable. Therefore, it is necessary to consider how to quickly carry out self-rescue and recovery after the system crashes, so as to reduce the economic losses and social unrest caused by the accident. In recent years, the frequent occurrence of large-scale power outages in the power system in various countries has fully demonstrated the importance of studying the black-start process of the power system, and the black-start of thermal power plants is an important part of it. [0003] The process system of thermal power units is c...

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Problems solved by technology

[0005] The thermal power unit needs to be equipped with a diesel unit with sufficient capacity to ensure the normal start-up of the factory load; on the one hand, the load start-up sequence has not been optimized at present, and the capacity setting value of the diesel unit is generally large, which will increase the cost; on the other hand, there is a lack of model establishment and simulation verification to ensure that the thermal power plant can successfully complete the entire black start process under the set diesel unit capacity

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