阅读说明：本技术 一种燃机气门调频持续响应控制方法 (Gas turbine valve frequency modulation continuous response control method ) 是由 赵毅 张长志 李浩然 倪玮晨 *** 周连升 甘智勇 张应田 郑卫洪 曹晓男 黄 于 2019-09-19 设计创作，主要内容包括：本发明涉及一种燃机气门调频持续响应控制方法,在变动负荷回路中增加限速模块,该限速模块分析输入的频率偏差的函数值并输出对应的指令。本发明在电网频率变化后,频率变化信号快速转化为负荷指令,最快速率调整发电负荷；在电网频率恢复后,频率变化信号缓慢转化为负荷指令,最大贡献量参与一次调频；在电网频率未变化时,限速模块采用最快的速率,避免影响机组正常调整负荷。(The invention relates to a continuous response control method for the frequency modulation of a gas turbine valve, wherein a speed limit module is added in a variable load loop, and the speed limit module analyzes the function value of the input frequency deviation and outputs a corresponding instruction. According to the invention, after the frequency of the power grid changes, the frequency change signal is quickly converted into a load instruction, and the power generation load is adjusted at the fastest rate; after the frequency of the power grid is recovered, the frequency change signal is slowly converted into a load instruction, and the maximum contribution amount participates in primary frequency modulation; when the frequency of the power grid is not changed, the speed limiting module adopts the fastest speed, so that the influence on the normal load adjustment of the unit is avoided.)

1. a continuous response control method for frequency modulation of a gas turbine valve is characterized by comprising the following steps: adding a speed limit module in the variable load loop, wherein the speed limit module analyzes the function value of the input frequency deviation and outputs a corresponding instruction, and the analysis process and the instruction output process of the function value comprise the following steps:

Acquiring a frequency deviation function value;

analyzing frequency deviation:

when the frequency deviation change needs to increase the instruction output, the lowest change per second is selected as the descending rate of 0.06, the ascending rate is the maximum change per second of 9999, and the next step is carried out after the instruction is increased;

When the frequency deviation change needs to reduce the instruction output, the lowest change per second is selected as the ascending rate to be 0.06, the descending rate is the maximum change per second to be 9999, and the next step is carried out after the instruction reduction is finished;

when the frequency deviation change is changed from the increasing instruction to 0, the lowest change of the descending speed is changed by 0.06 per second, the speed is continuously recovered to 9999 after the reducing process is finished, the ascending speed keeps the change of 9999 per second unchanged, and the next step is carried out;

when the frequency deviation change is changed from the reduction instruction to 0, the lowest change per second of the rising rate is selected to be 0.06, the change per second is recovered to be 9999 after the increasing process is finished, the descending rate keeps the change per second of the 9999 unchanged, and the next step is carried out;

when the output of the frequency deviation function is 0, all the speed is 9999 changes every second, and the next step is carried out;

And returning to the step.

Technical Field

The invention belongs to the technical field of gas turbine control, and particularly relates to a gas turbine valve frequency modulation continuous response control method.

Background

The frequency of the power grid is determined by the generated power and the user load, when the generated power is larger than the user load, the frequency is increased, otherwise, the frequency is reduced. The primary frequency modulation means that once the frequency of the power grid deviates from a standard frequency limit value, a generator set in the power grid automatically controls the increase and decrease of load, so that the frequency of the power grid is maintained stable. With the gradual expansion of the power grid capacity, it becomes more and more important to improve the frequency response capability when the load of the power grid changes and ensure high-quality power supply. The gas turbine valve is an important device for the gas turbine to continuously change load, and the opening of the valve is continuously adjusted according to the comprehensive instruction change of the gas turbine to adjust the natural gas flow entering a combustion chamber. The primary frequency modulation function of the gas turbine is completed by a turbine control system and a DCS control system together. The frequency deviation of the turbine control system can be responded at the first time, and the DCS control system can ensure that the load is kept contributing continuously under the condition that the frequency deviation exists all the time. At present, frequency changes are common, the amplitude of the changes is small, and the standard frequency is recovered in a short time. The DCS control side signal is not transmitted to the gas turbine control system, namely when the gas regulating valve does not act, the frequency is recovered to a standard value, so that the DCS command is frequently fluctuated but does not play a real role. In the fuel control mode, the primary frequency modulation operation capability is provided in both the manual mode and the pre-selection mode, but the technical requirements of the power grid on the primary frequency modulation are basically not met, so that a method for responding to frequency fluctuation continuously and playing an important role of the primary frequency modulation actively is required.

disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a continuous response control method for the frequency modulation of a gas turbine valve, which is used for slowing down the change process and the recovery process.

the invention adopts the following specific technical scheme:

A continuous response control method for frequency modulation of a gas turbine valve is characterized by comprising the following steps: adding a speed limit module in the variable load loop, wherein the speed limit module analyzes the function value of the input frequency deviation and outputs a corresponding instruction, and the analysis process and the instruction output process of the function value comprise the following steps:

Acquiring a frequency deviation function value;

Analyzing frequency deviation:

When the frequency deviation change needs to increase the instruction output, the lowest change per second is selected as the descending rate of 0.06, the ascending rate is the maximum change per second of 9999, and the next step is carried out after the instruction is increased;

When the frequency deviation change needs to reduce the instruction output, the lowest change per second is selected as the ascending rate to be 0.06, the descending rate is the maximum change per second to be 9999, and the next step is carried out after the instruction reduction is finished;

when the frequency deviation change is changed from the increasing instruction to 0, the lowest change of the descending speed is changed by 0.06 per second, the speed is continuously recovered to 9999 after the reducing process is finished, the ascending speed keeps the change of 9999 per second unchanged, and the next step is carried out;

When the frequency deviation change is changed from the reduction instruction to 0, the lowest change per second of the rising rate is selected to be 0.06, the change per second is recovered to be 9999 after the increasing process is finished, the descending rate keeps the change per second of the 9999 unchanged, and the next step is carried out;

When the output of the frequency deviation function is 0, all the speed is 9999 changes every second, and the next step is carried out;

and returning to the step.

the invention has the advantages and beneficial effects that:

In the invention, a speed limit module is added in the variable load loop, and the speed limit module analyzes the function value of the input frequency deviation and outputs a corresponding instruction. Therefore, after the frequency of the power grid changes, the frequency change signal is quickly converted into a load instruction, and the power generation load is adjusted at the fastest rate; after the frequency of the power grid is recovered, the frequency change signal is slowly converted into a load instruction, and the maximum contribution amount participates in primary frequency modulation; when the frequency of the power grid is not changed, the speed limiting module adopts the fastest speed, so that the influence on the normal load adjustment of the unit is avoided.

Drawings

FIG. 1 is a schematic diagram of the present invention;

fig. 2 is a schematic diagram of the prior art.

Detailed Description

the present invention is further described in the following examples, but the technical content described in the examples is illustrative and not restrictive, and the scope of the present invention should not be limited thereby.

the invention discloses a continuous response control method for frequency modulation of a valve of an internal combustion engine, which is characterized in that as shown in figure 1: adding a speed limit module in the variable load loop, wherein the speed limit module analyzes the function value of the input frequency deviation and outputs a corresponding instruction, and the analysis process and the instruction output process of the function value comprise the following steps:

Acquiring a frequency deviation function value;

Analyzing frequency deviation:

When the frequency deviation change needs to increase the instruction output, the lowest change of the descending rate is 0.06 per second, and the highest change of the ascending rate is 9999 per second;

when the frequency deviation change needs to reduce the instruction output, the lowest change per second of the ascending rate is 0.06, the highest change per second of the descending rate is 9999, and the next step is carried out;

when the frequency deviation change is changed from the increasing instruction to 0, the lowest change of the descending speed is changed by 0.06 per second, the speed is recovered to 9999 after 2 seconds, the ascending speed keeps the change of 9999 per second unchanged, and the next step is carried out;

when the frequency deviation change is changed from the reduction instruction to 0, the lowest change per second of the rising rate is changed by 0.06, the change per second is recovered to change per second 9999 after lasting for 2 seconds, the descending rate keeps the change per second 9999 unchanged, and the next step is carried out;

When the output of the frequency deviation function is 0, all the speed is 9999 changes every second, and the next step is carried out;

And returning to the step.

the invention is applied to a gas turbine control system, and has the main effects that when the frequency of a power grid changes, the load of a unit changes before the unit changes the generating power and increases a program, but the invention has the function of slowing down the change process, mainly the recovery process.