A primary frequency modulation optimization method based on direct mining power network frequency

Abstract

The invention provides a primary frequency modulation optimization method based on the frequency of a direct mining power network, The method comprises the following steps of: (1) changing the sampling mode of frequency: configuring a primary frequency modulation sampling device; after the current and voltage signals are connected, the primary frequency modulation sampling device can calculate allelectrical quantities such as active power, reactive power and power factor, and output three independent high-precision frequency signals to participate in the primary frequency modulation; (2) Connect the GPS timing system of the whole plant: make the BPT9301FA primary frequency modulation sampling device align with the time scale of the whole plant, especially the time scale of PMU device is the same; (3) Connect the BPT9301 computer network dynamic monitor, record the relevant data changes of the power network and the unit, and ensure that our abnormal state can be traced, mainly including the following data: power network frequency, machine-side power, valve opening, load instruction, integrated electric quantity, etc.; (4) The strategy of thermal control system is optimized to makethe primary frequency modulation pass the test and ensure the safe and stable operation of the unit.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a primary frequency regulation optimization method based on the frequency of a direct mining power grid. Background technique [0002] At present, large-scale assessment events occur from time to time for thermal power units due to the lack of primary frequency regulation to respond to grid load. According to the analysis, it is mainly caused by the asynchronous frequency modulation load response, the different sources of the frequency signal used in the grid assessment and the measurement signal of the thermal power unit, the asynchronous collection clock caused by the fault of the power plant PMU, and the actual load of the unit being affected by the boiler combustion. [0003] The change trend of the network frequency signal used in the grid assessment should theoretically be ahead of the speed signal of the thermal power unit. At present, the speed measureme...

AI Technical Summary

Problems solved by technology

If the frequency regulation dead zone of the unit is artificially modified to be less than 2r / min, although the response amplitude of the primary frequency regulation can be improved, the excessive frequency of the valve regulation action of the unit will even affect the safe operation of the unit, such as EH oil leakage of the high-regulation valve and LVDT feedback wear fault problem

[0006] Although the power grid sends DCS system with grid frequency signals, the range is generally 45~55Hz, the accuracy cannot meet the demand, and the time is relatively long, which is difficult to meet the requirements of quick response