Optimum control method and system for primary frequency modulation of thermal power units based on amplitude maintenance
A thermal power unit, optimization control technology, applied in the direction of reducing/preventing power oscillation, etc., can solve the problem that the response amplitude does not meet the requirements of the assessment standard, and achieve the goal of improving rapidity and accuracy, maintaining safe operation, and reducing adverse effects. Effect
Active Publication Date: 2016-07-27
STATE GRID CORP OF CHINA +2
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[0005] Due to the rapidity and transient characteristics of primary frequency regulation, its adjustment curve is mainly reflected in the form of sharp pulses on the power plant unit side. At the same time, due to the high sampling accuracy of WAMS data (40ms), the actual frequency, power and other parameter curves contain many Glitch, the scheduling side has carried out filtering processing, so the actual frequency modulation response is affected by the conversion calculation of various systems and the influence of network transmission and other factors, there will inevitably be a certain attenuation, resulting in the response amplitude in the actual assessment not reaching the assessment standard Require
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[0030] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0031] like figure 1 As shown, a thermal power unit primary frequency modulation optimization control system based on amplitude maintenance, including:
[0032] After the unit speed deviation signal Δn passes through the frequency modulation compensation function f(x), the load compensation ΔP1 is generated, and ΔP1 is respectively connected to the X2 input terminals of TWOSEL1 and TWOSEL2, and the output ΔP2 of the analog switcher AXSEL2 is respectively connected to TWOSEL1 and TWOSEL2 The X1 input terminal of , the output terminals of TWOSEL1 and TWOSEL2 are respectively connected to the Z1 input terminal and Z2 input terminal of the analog switcher AXSEL1.
[0033] The unit speed deviation signal Δn is connected to the X1 input terminal of the CMP, the X2 input terminal of the CMP is connected to zero, and the output terminal of the CMP is connected to th...
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The invention discloses a thermal power unit primary frequency modulation optimization control method and system based on amplitude maintenance, including: when the absolute value of the unit speed deviation signal Δn is within the set range, the system scheduling assessment action value is not reached, and the system outputs is the load compensation amount ΔP1 generated after the unit speed deviation signal Δn is compensated by a frequency modulation compensation function f(x); when the absolute value of the unit speed deviation signal Δn is outside the set range, it reaches the system scheduling assessment action value, The final output of the system is determined according to the positive or negative of the unit speed deviation signal Δn, and the duration of the final output of the system is determined according to the set lag time. Beneficial effects of the present invention: the present invention can solve practical problems such as poor primary frequency regulation assessment indicators of thermal power units, can effectively meet the requirements of the power grid for primary frequency regulation of the unit, and meet the needs of frequency regulation and peak regulation.
Description
technical field [0001] The invention relates to the field of frequency modulation of thermal power units, in particular to an optimization control method and system for primary frequency modulation of thermal power units based on amplitude maintenance. Background technique [0002] With new energy connected to the grid, load growth and the scale of the grid continue to increase, under the new situation of the interconnection of the UHV grid and the regional grid, the connection between the grids at all levels is becoming increasingly close, and the requirements for coordination and cooperation between the grid and the unit are also increasing. The higher the value, the primary frequency regulation in the network plant coordination function becomes one of the effective means to stabilize the power grid. The primary frequency regulation function of the generator set is an inherent function of the turbogenerator set. It is mainly through adjusting the steam inlet control door o...
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IPC IPC(8): H02J3/24
Inventor 李军李慧聪王昭鑫赵岩
Owner STATE GRID CORP OF CHINA