Power system energy and standby combined scheduling method based on power supply reliability

Abstract

The invention relates to a power system energy and standby combined scheduling method based on power supply reliability and belongs to the technical field of power system scheduling. According to thescheduling method, the minimum sum of power system energy cost, standby cost and risk loss cost is taken as a target, a power shortage expectation is taken as a reliability index for constraint, and an obtained power system operation mode is optimized. According to the method, a system standby capacity is determined according to s real-time load level and a startup combination of the power system,the system standby pressure is effectively relieved, power generation resources are fully utilized, the system operation standby cost is saved, and the economy of power system operation is improved.The method can be used for large power grid energy and standby combined economic scheduling, the reliability of the system operation can be significantly improved with a small cost increment, and themethod has important practical significance and good application prospects.

Description

technical field [0001] The invention relates to a power system energy and backup joint scheduling method based on power supply reliability, and belongs to the technical field of power system scheduling. Background technique [0002] The reserve capacity of the power system is the reserve capacity beyond the guaranteed supply system load. It is the additional active capacity required to meet load forecast errors, unexpected outages of equipment, and new energy forecast deviations, so as to ensure that the system is under a certain range. smooth transition to a new stable operating state when disturbed. In the traditional reserve capacity reservation method, in order to ensure the safe and reliable operation of the system, extreme situations such as large load fluctuations or unexpected equipment outages are usually considered, and a constant reserve capacity is reserved. The capacity is based on a fixed ratio of the maximum power generation load or the maximum The capacity o...

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Problems solved by technology

The method of determining reserve capacity based on uncertain factors and operating costs at home and abroad has achieved some research results, but considering the requirements of safe and economical operation of the power system, there are still the following problems: Under the traditional operation reserve management method that only considers reliability, reserve The utilization efficiency of the reserve capacity is very low, resulting in a serious waste of power generation resources, and the system must bear high reserve costs and energy opportunity costs, and the economy is poor; the method of determining the reserve capacity through joint optimization of electric energy and reserve capacity is more accurate High, and the reserve capacity is relatively small. Once a more serious load deviation or equipment failure occurs than expected, it will cause a large power outage loss, and a certain risk cost needs to be borne; no quantitative assessment of the risk or reliability of system operation is considered. , the lack of a unified economic index to weigh the reliability and economy of the power grid operation

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