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A network frequency adjustment method for rapid load reduction of generator sets

A technology of generator set and adjustment method, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as the inability to effectively reduce the number of non-stops of the unit, instability of the power grid, and inconsistent frequency matching between the machine and the network, so as to prevent incomplete combustion Stable, reduce the number of non-stops, and avoid the effect of network collapse

Active Publication Date: 2017-10-03
JIUQUAN IRON & STEEL GRP
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AI Technical Summary

Problems solved by technology

Inconsistent frequency matching between machine and network in the direct power supply system from large power source to large load will easily lead to instability of the power grid and cannot effectively reduce the number of non-stops of the unit, causing the large load shortage of the power supply system to cause network collapse

Method used

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  • A network frequency adjustment method for rapid load reduction of generator sets
  • A network frequency adjustment method for rapid load reduction of generator sets
  • A network frequency adjustment method for rapid load reduction of generator sets

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Embodiment Construction

[0016] According to the frequency adjustment capability and load situation of each unit in the direct power supply system from large power to large load, the rapid load reduction unit is formulated. A factory has 3 350MW units (marked #1, #2, #3), 2 41.5MW units (labeled #4, #5), and 2 30MW gas-fired units (labeled #6, #7) ) constitute a large power system with a maximum total capacity of 1193MW. The large load side is the electrolytic aluminum project, and the transient load demand is 810MW of active power and 305Mvar of reactive power, which is supplied by the large power system composed of the above-mentioned "3 large machines + 4 small machines". After testing the primary frequency modulation response characteristics of three 350MW units, it can realize 3s action under the three working conditions of 60% PN (PN refers to the rated load of the unit), 75% PN and 90% PN, according to the frequency adjustment within 15S. Through the comprehensive analysis of load adjustment r...

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Abstract

The invention discloses a grid frequency regulation method for reducing loads of a generator set rapidly. The method includes the steps that a rapid load reduction set is prepared, the control mode and the steam inlet mode of the rapid load reduction set are selected, the rapid load reduction capacity of the rapid load reduction set is obtained through a simulation experiment, then a grid frequency regulation range is determined according to the correspondence between grid frequency and loads in a large power source-heavy load direct power supply system, then the number of turbine steam inlet regulation valves, needing to be closed, in the generator set is determined according to the grid frequency regulation range and the corresponding amount of loads reduced by rapidly closing turbine steam inlet regulation valves, and the steam inlet regulation valves, on the power side, of the generator set are rapidly closed to rapidly reduce the loads. The method is suitable for rapidly reducing the loads of generators in the large power source-heavy load direct power supply system to achieve grid frequency regulation, solves the problem that when grid frequency in the large power source-heavy load direct power supply system is excessively high, no small set of an appropriate capacity is available to be cut off so as to reduce the grid frequency, achieves the purpose of reducing the loads to reduce the frequency without shutdown and avoids the risk of grid breakdown of a power source system.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and relates to a network frequency adjustment method for each generator set in a large power supply direct power supply system to a large load system, in particular to a network frequency adjustment for rapid load reduction of a generator set in a large power supply direct power supply system to a large load method. Background technique [0002] There is no operation and practice precedent for reference in China at present in the direct power supply grid mode of large unit to large cell electrolytic aluminum. The selection of the unit's rapid load reduction control mode, the setting of the load reduction amount and the number of closed steam turbine inlet valves directly affect the safe operation of the power grid. In the early stage of the direct power supply system, due to the small number of units and the limited frequency regulation capability of the units, the dir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/40
CPCH02J3/24H02J3/46
Inventor 文博任庆华章燎米玉鸿张长茂
Owner JIUQUAN IRON & STEEL GRP
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