High-speed load increasing peak regulation system and method of thermal power generating unit

Abstract

The invention discloses a high-speed load increasing peak regulation system and method of a thermal power generating unit. According to the high-speed load increasing peak regulation system and methodof the thermal power generating unit, a high-precision power grid side frequency meter is adopted to measure power grid frequency of a main transformer high-voltage side, the power grid frequency isinput to a lower limit-crossing trigger module, when the power grid frequency is lower than a frequency action lower limit set by the lower limit-crossing trigger module, a high-speed load increasingdemand signal is output and sent to a load increasing peak regulation action and gate, when the high-speed load increasing demand signal and the high-speed load increasing permission instruction fromthe thermal power generating unit are simultaneously ture or 1, a final high-speed load increasing action instruction is output, entering a high-speed load increasing peak regulation control action selection switch group is carried out , a corresponding bypass valve is switched according to the switch configuration of the action group capable of being reselected, and high-speed load increasing peak regulation of the thermal power generating unit is realized. According to the high-speed load increasing peak regulation system and method of the thermal power generating unit, remote triggering ofpower grid dispatching is not needed, the response speed and reliability are good, the system is used for power grid dispatching in emergency, and the system particularly has important practical significance for the power grid of the middle-east receiving end area where ultra-high-voltage high-power long-distance power transmission is implemented in China.

Description

technical field [0001] The invention relates to the technical field of automatic control of thermal power plants, in particular to a system and method for peak load regulation by limit-up load of a thermal power unit. Background technique [0002] my country's three northern regions are rich in wind and light resources. In recent years, the installed capacity of wind power and photovoltaics has continued to grow rapidly. These local grids that receive high-power transmission are called receiving end grids. [0003] An important feature of the receiving power grid is that the power generated by the local unit is much smaller than the local power load. Although it is supplemented by external power generation, this brings a huge risk to the operation of the power grid, that is, the failure of the high-power long-distance power transmission line. Tripping, low-voltage ride-through fault removal of large-scale wind farms at the transmission end, etc., will cause the power generat...

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Problems solved by technology

[0013] Based on the above analysis, it can be found that the high-speed primary frequency regulation cannot last long, and the large and long-lasting AGC and tertiary frequency regulation cannot achieve high-speed peak regulation, and in high-load conditions such as peak power consumption in summer, a large number of units operate at rated load. The ability to increase load peak regulation is very weak, which is also the biggest problem facing the load dispatching of the receiving power grid at present, that is, there is a lack of a high-speed and large-scale load regulation method to deal with large load disturbances

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