Energy-saving method for distributing load for thermal power generating units by combining dynamic unit combination with equation incremental rate

Abstract

The invention relates to the field of power grid generation planning and energy-saving running of thermal power generating units and discloses an energy-saving method for distributing load for thermal power generating units by combining dynamic unit combination with equation incremental rate method. Requirements of energy-saving generation dispatching of a power grid and practical running of the thermal power generating units are met, energy saving and consumption reduction of the power grid and reasonable adjustment of exertion of the thermal power generating units when load fluctuates are realized. The technical scheme includes that by means of dynamic unit combination, combination of the thermal power generating units involved in system load adjustment is determined, and exertion values of the units are determined by the equation incremental rate method taking exertion continuous periods constraint table and creep and descending speed constraint into consideration; unit exertion trend revising policies are introduced, unit exertion is revised according to difference between exertion adjustment trends and system load variation trends, and accordingly, a final load adjustment scheme is obtained. The problem that distribution results are not complied with practical running requirements when generation sequence and the equation incremental rate method are applied to load distribution is effectively solved, practicality and stability of the energy-saving method are verified by practical application, and the energy-saving method for distributing load for thermal power generating units by combining dynamic unit combination with equation incremental rate method has rational and practical reference significance in energy-saving generation dispatching of other power grids.

Description

technical field [0001] The invention relates to the field of power grid generation planning and thermal power unit energy-saving operation, in particular to a thermal power unit energy-saving load distribution method combining dynamic unit combination and equal micro-increase rate method. technical background [0002] Energy-saving power generation dispatching is a power generation dispatching rule with energy saving and emission reduction as the core goal. It is an important measure that China is vigorously promoting in the power system industry in order to realize the sustainable development strategy. As of the beginning of 2010, the total installed capacity of my country's power system reached 874 million kW, of which thermal power was 625 million kW, accounting for 74.60% of the total installed capacity. Therefore, in meeting the actual operation requirements of the power grid, taking into account factors such as safety and fairness, and proposing a new energy-saving loa...

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Problems solved by technology

[0003] In the energy-saving power generation scheduling rules issued by the National Development and Reform Commission, it is recommended to carry out energy-saving power generation scheduling in the power system based on the power generation sequence table and the equal micro-increase rate method, but the above methods have encountered some problems in actual engineering applications: 1. Firepower It is difficult for generating units to ensure the safety of power grid operation and peak-shaving requirements during the period when the system load peak-valley difference is large. The power generation sequence table is that the local economic and information commissions sort the generating units in the area according to the coal consumption level from low to high according to certain guidelines. The higher the order is, the more energy-efficient the units are. The principle also requires that the units with the highest order should be fully powered as much as possible, and the units with the lower order should be kept at the lowest output state as much as possible. This may lead to serious polarization, and it is very likely to cause system fluctuations. The output rate cannot meet the system load change rate; 2. The conventional equal micro-increase rate algorithm does not consider the upper and lower limits of the unit output and the constraints of the climbing and descending rate when distributing the system load, and the load distribution results will not meet the actual operation of the unit 3. In the time period when the system load fluctuates greatly, the unit output process changes too frequently in the equal micro-increment rate algorithm allocation scheme, which not only increases additional fuel consumption but also causes a large loss to the unit; 4. Utilizes equal micro-increment rate The result obtained by the distribution of the rate algorithm may appear that the change trend of the unit output is inconsistent with the change trend of the system load, and does not meet the actual operation requirements.

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