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Primary frequency modulation electric quantity compensation refined control method and apparatus under giant hydroelectric generating set power mode

A fine control and power mode technology, applied in the direction of reducing/preventing power oscillation, single network parallel feeding arrangement, etc., can solve the problems of insufficient power regulation, insufficient integral power, low contribution rate of unit frequency regulation, etc., to improve qualified efficiency, improve power quality, and ensure safe and stable operation

Active Publication Date: 2017-12-08
CHINA YANGTZE POWER
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Problems solved by technology

[0010] In order to solve the problems of insufficient power regulation of the first frequency regulation action, insufficient integral power, and quick action under the power mode of the giant hydroelectric unit, solve the problem of low contribution rate of the unit's primary frequency regulation

Method used

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  • Primary frequency modulation electric quantity compensation refined control method and apparatus under giant hydroelectric generating set power mode

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Embodiment Construction

[0036] like figure 1 As shown, the refined control method of primary frequency modulation compensation in the power mode of giant hydroelectric units includes the following steps:

[0037] Step 1: Grid standard frequency f 0Obtain the frequency difference signal △f* of the actual grid frequency f in real time;

[0038] Step 2: Determine whether the frequency difference signal △f* in step 1 is in the frequency dead zone of primary frequency modulation △f 0 In addition, if it exceeds the frequency dead zone △f of primary frequency modulation 0 , execute step 3, if in the frequency dead zone △f 0 Inside, return to step 1;

[0039] Step 3: Using the frequency difference signal △f* in step 1, when the governor of the giant water turbine unit is in power mode,

[0040] If the frequency modulation dead zone △f 0 0 + power dead zone equivalent frequency m, then the actual equivalent frequency difference signal △f = frequency difference signal △f*±(primary FM frequency dead zone ...

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Abstract

The invention discloses a primary frequency modulation electric quantity compensation refined control method and apparatus under a giant hydroelectric generating set power mode. The control method comprises the steps of obtaining a frequency difference signal between a power grid standard frequency and an actual power grid frequency obtained in real time; judging whether the frequency difference signal is outside a primary frequency modulation frequency dead zone or not, if the frequency difference signal exceeds the primary frequency modulation frequency dead zone, delaying for 0.1second and then outputting a primary frequency modulation action signal; using the frequency difference signal, and enabling a giant hydroelectric generating set speed regulator to be in a power mode; if the actual power grid frequency obtained in real time exceeds the primary frequency modulation frequency dead zone and is within in a range of a superposition value between the primary frequency modulation frequency dead zone and power dead zone equivalent power, performing superposition between a frequency compensation coefficient and the corresponding function of a frequency modulation load according to the frequency difference signal to obtain corresponding theoretical frequency modulation power; obtaining corresponding theoretical regulation power according to the frequency difference signal and the corresponding function of the frequency modulation load; and forming a PID closed loop by a new active given value and the actual power value of the giant hydroelectric generating set, and outputting a corresponding frequency modulation load instruction. By virtue of the primary frequency modulation electric quantity compensation refined control method and apparatus, the primary frequency modulation contribution rate of the giant hydroelectric generating set can be accurately controlled, the primary frequency modulation percent of pass is improved, and the electric energy quality can be improved.

Description

technical field [0001] The invention relates to the field of primary frequency modulation of giant hydroelectric generating units, in particular to a refined control method and device for primary frequency modulation compensation in the power mode of giant hydroelectric generating units. Background technique [0002] For giant hydropower stations, as the power system has higher and higher requirements on the safety and stability of the power grid and the quality of the power grid, in order to ensure the safe operation of the power grid and generating units, so that the grid-connected operating units can adapt to changes in grid load and frequency at any time, it is necessary Give full play to the primary frequency modulation function of the giant power station. Grid frequency is the balance relationship between grid load and generator active power. It is an important parameter of grid operation and is related to many factors such as the safety, stability, and economy of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/48
CPCH02J3/24H02J3/48
Inventor 汪林丁伦军夏建华张辉李妮婷周云飞田源泉
Owner CHINA YANGTZE POWER
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