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A primary frequency regulation system of a gas-steam combined cycle unit

A combined cycle unit, gas steam technology, applied in electrical components, reducing/preventing power oscillation, AC network circuits, etc. Improve the pass rate and ensure stable results

Active Publication Date: 2022-02-18
HUADIAN ZHEJIANG LONGYOU THERMAL POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The TCS control system (traction control system) of the gas turbine has the function of primary frequency regulation. From the assessment and analysis of the two operation conditions of the power system, the qualified rate of primary frequency regulation is about 93%. The original system has gas turbine speed deviation, primary frequency regulation without blocking, There are defects in the load command circuit, and the primary frequency regulation corresponds to the gas turbine load action range is too large; there is an urgent need for a primary frequency regulation system with stable primary frequency regulation and high pass rate

Method used

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  • A primary frequency regulation system of a gas-steam combined cycle unit
  • A primary frequency regulation system of a gas-steam combined cycle unit
  • A primary frequency regulation system of a gas-steam combined cycle unit

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Embodiment 1

[0058] Such as figure 1 As shown, the present invention discloses a primary frequency regulation system of a gas-steam combined cycle unit. In the temperature control mode, the frequency regulation load is reserved once, and the temperature control load fixed value operation unit that takes into account the load rate of the stable gas turbine is connected to the main control unit and can control the initial action base value of the frequency regulation when the first frequency regulation load deviation is small The load auxiliary control unit for the running of the gas turbine unit and the primary frequency regulation test unit for performing an online frequency regulation test on the gas turbine unit; wherein, the main control unit includes an acquisition unit for obtaining the rotational speed signal source of the primary frequency regulation, connected to the acquisition unit The control unit, the execution unit connected to the control unit and used to control the load of ...

Embodiment 2

[0061] Such as Figure 2-7As shown, the difference between this embodiment and Embodiment 1 is: in this embodiment: the acquisition unit includes: a rotational speed acquisition unit for acquiring the rotational speed of a turbogenerator set, and the rotational speed acquisition unit includes a plurality of rotational speed probes; The time detection unit collects the initial time and duration of a frequency modulation action, and the time unilateral unit includes a timer; the frequency comparison unit lists the initial time and duration comparison table of a frequency modulation action in a certain period of time, and compares the selected positions The speed value of the turbine generator with the smallest deviation from the frequency of the grid; signal output unit: connected to the frequency comparison unit, select the minimum speed value of the deviation between the speed of the turbine generator set and the grid frequency, and output it as a primary frequency modulation s...

Embodiment 3

[0076] Such as Figure 8 As shown, the difference between this embodiment and Embodiment 1 is that: In this embodiment, a synchrophasor measurement unit is also included to monitor the entire power system and provide system protection; a frequency detection unit is connected to the synchronization The phasor measurement unit is used to analyze the frequency data of the synchrophasor measurement unit; the frequency sending unit is connected to the frequency detection unit and used to send the data information analyzed by the frequency detection unit to DCS or DEH.

[0077] In this embodiment, the frequency sending unit is connected to the DCS or the DEH through a communication unit.

[0078] Through the above technical solution, using the frequency data of the synchrophasor measurement unit, the frequency detection unit is used to analyze the required frequency data of the synchrophasor measurement unit, and the frequency data is sent to the DCS or DEH of the generator set thro...

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Abstract

The technical solution of the present invention is realized in the following way: a primary frequency regulation system of a gas-steam combined cycle unit, which is characterized in that it includes: a main control unit for controlling the operation of primary frequency regulation; a temperature control load fixed value operation unit for When the gas turbine unit is in the temperature control mode, a frequency regulation load is reserved, and the load rate of the gas turbine is stabilized; the load auxiliary control unit controls the operation of the initial action value of the frequency regulation when the load deviation of the primary frequency regulation is small; a frequency regulation test The unit is used to perform an online primary frequency regulation test on the gas turbine unit; the main control unit includes: an acquisition unit that obtains a speed signal source for primary frequency regulation; a control unit that includes DCS, AGC and TCS; an execution unit that controls the load of the gas turbine unit; The beneficial effect of the invention is that the primary frequency modulation is stable, the qualified rate of the primary frequency modulation is high, and it is not easy to fail.

Description

technical field [0001] The invention relates to the technical field of power system frequency regulation, in particular to a primary frequency regulation system of a gas-steam combined cycle unit. Background technique [0002] Primary frequency regulation refers to the automatic control process that once the frequency of the power grid deviates from the rated value, the control system of the unit in the power grid will automatically control the increase or decrease of the active power of the unit, limit the change of the power grid frequency, and maintain the stability of the power grid frequency; the power grid is a huge According to the rotor motion equation, when the active power of the grid is insufficient, the rotor of the generator accelerates, and the frequency of the grid increases; otherwise, the frequency of the grid decreases; therefore, the primary frequency regulation function is one of the means to dynamically ensure the balance of the active power of the grid; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/48H02J3/24
CPCH02J3/48H02J3/241
Inventor 石磊箭黄月丽胡程斌吕玥婷徐毕增楼华栋张昊胡孟文胡海航陈海文
Owner HUADIAN ZHEJIANG LONGYOU THERMAL POWER CO LTD