CN104158453B - A kind of by the generator load sudden change start time shielding interference signal suppression anti-method adjusted of power - Google Patents

Abstract

The invention discloses a method for suppressing power reverse adjustment by shielding the interference signal at the beginning moment of generator load sudden change. The basic idea of the present invention is that the disturbance signal based on the power reverse adjustment is introduced into the load controller when the generator load mutation begins to occur, and the disturbance signal presents the characteristics of being strong at the beginning and then weak at the end, and rapidly attenuates, thus affecting the load of the speed control system The controller is modified to shield the disturbance signal during the period from the sudden change of generator load to the disturbance signal decaying to zero, so that the disturbance signal does not enter the load controller, so as to eliminate the reverse adjustment of steam turbine power.

Description

A method of suppressing power reverse adjustment by shielding interference signals at the beginning of generator load sudden change

technical field

The invention belongs to the control field of the speed regulating system of the electric power system, and specifically relates to providing a method for preventing the reverse adjustment of the power of the steam turbine when the load of the generator changes suddenly for the steam turbine generator set.

Background technique

The speed control system is used in power plants to control the speed and power of steam turbines. The speed regulation system is mainly composed of frequency regulation controller, load controller and regulating level pressure controller. When the unit is in load control state, it is mainly completed by frequency regulation controller and load controller.

The frequency modulation controller is a controller adopting the proportional control law, which is established for the generator set to participate in the primary frequency regulation of the power grid under the load control state. The frequency modulation controller calculates and generates a frequency difference signal reflecting the frequency fluctuation of the power grid according to the steam turbine speed signal. The frequency difference signal is subjected to a proportional control calculation, and the calculation result is used as the primary frequency modulation correction value of the generator power given command to control the output of the generator set Adapt to the requirements of grid frequency. , the FM controller takes into account the input dead zone setting, control operation and output limiter.

The load controller is the power control loop of the coordinated control system, which adopts a controller with proportional-integral law. The load controller uses the deviation between the given command of the steam turbine and the power signal of the generator corrected by the primary frequency adjustment correction value output by the frequency control controller to perform proportional integral control calculation, and uses the calculation result as a correction factor to further correct the power given by the steam turbine. Set instructions to control the actual power of the generator.

Since the power signal of the steam turbine is difficult to measure, the speed control system often uses the power signal of the generator instead of the power signal of the steam turbine in practical applications. From a static point of view, there is no difference between the two, but from a dynamic point of view, the difference between the two is very large. big. Because the negative value of the generator load signal is introduced into the speed control system, that is, the external disturbance negative signal participates in the regulation of the steam turbine, so the power reverse adjustment occurs when the generator suddenly increases or decreases the load. The occurrence of this reverse adjustment will bring great harm to the safe operation of the unit and the power system. Due to the different signals taken, the stability of different systems is different, and more importantly, the load shedding characteristics of the systems are very different. The root cause of the difference is that the turbine power signal is a feedback signal, while the generator power signal is a disturbance signal. The direction of force of this signal during load shedding makes the regulating steam valve open, thus deteriorating the transition process. Carrying out simulation calculations for the above two regulation systems, it can be seen that when the power of the generator is measured as the power signal, the speed rise is much higher than when the power of the steam turbine is measured. Instead of closing the regulating steam valve small, it is instead opening the large regulating steam valve. This phenomenon can only be overcome when the speed increases to a certain value.

With the implementation of the 750kV interconnection project between Xinjiang and Northwest main grids, the 750kV grid structure of Xinjiang power grid has been further extended, the system scale has also been continuously expanded, and the ability to withstand the impact of faults has gradually increased. However, the 750kV main grid structure of Xinjiang power grid is still in the initial stage of formation, and the connection between power grids in various regions is relatively weak. Most of the 750kV substations are single main transformers. The chain type is merged into Dongjiang, and the Hexi Corridor, which connects Dongjiang to the Northwest main network, is also a long chain structure. In order to prevent problems such as temporary stability, dynamic stability, and thermal stability after serious system failures, multiple 750/220kV electromagnetic ring networks in Xinjiang Province have been de-looped, and the local power grid and the main network are only connected through a single point or two points. Therefore, after an N-1 or N-2 fault occurs in the 750kV grid of the system, the local power grid will be separated from the main grid for isolated island operation, which will bring frequency stability problems to the local power grid.

Xinjiang Electric Power Research Institute has conducted field tests and model studies on multiple units, and found in power grid simulation calculations that many power plants have varying degrees of reverse regulation. If the structure of the speed control system is not changed and the reverse regulation is eliminated, the The safe operation of the unit and the power system will be adversely affected. If the power reverse adjustment occurs in multiple power plants when the local power grid is decoupled, it will only make the accident situation worse, so it is imminent to eliminate the reverse adjustment phenomenon of the speed control system.

Existing methods for eliminating countertones are mainly based on the following theories:

According to the torque balance equation of steam turbine

${\mathrm{<span\; class="notranslate">\; J\&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\frac{\mathrm{<span\; class="notranslate">\; d\&omega;</span>}}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; E.</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In formula (1), P _T , P _E —respectively represent the steam turbine power and generator load; J—moment of inertia of the turbine generator set rotor, ω—rotor angular velocity, ω ₀ —rotor rated angular velocity, — Angular acceleration of the rotor.

After shifting, we can get

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; J</span>}{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\frac{\mathrm{<span\; class="notranslate">\; d\&omega;</span>}}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; E.</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Equation (2) shows that if the generator power signal is added with the speed signal, it can be equal to the steam turbine power signal. Therefore, if the differential signal of the speed is introduced into the system, and the amplification factor of the differential signal is properly selected, the generator power signal can be corrected into the steam turbine power signal theoretically.

There are mainly the following methods to eliminate anti-tone:

1) Introduce the differential signal of the rotational speed into the system, and correct the power signal of the generator to the power signal of the steam turbine;

2) Connect the dynamometer element in series with a hysteresis link to delay the change of the electric power signal;

3) Introducing a negative power differential signal into the system.

Existing methods have the following deficiencies:

1) Method 1 or 3 needs to adjust the magnification of the differential signal due to the introduction of the rotational speed or power differential signal. This parameter is not easy to set. If the parameter is too small, the effect is not obvious. If the parameter is too large, it is easy to amplify the interference signal ;

2) Method 2 actually delays the response of the speed control system, and there will still be a small amount of anti-adjustment effect if this method is used alone.

In view of the shortcomings of the existing methods, it should be considered to observe the anti-tuning phenomenon from other angles, and propose a scheme that is easy to realize in engineering practice and easy to adjust the parameters.

Contents of the invention

The purpose of the present invention is to solve the power reverse adjustment problem of the speed control system when the generator load changes suddenly, and propose a method for suppressing the power reverse adjustment by shielding the interference signal at the beginning of the generator load sudden change. Shield the interference signal during the period from the sudden change of generator load to the time when the interference signal decays to zero, so that the interference signal does not enter the load controller of the speed control system, so as to eliminate the reverse adjustment of steam turbine power.

The purpose of this application is achieved through the following technical solutions.

A method for suppressing power reversal by shielding interference signals at the beginning of generator load mutation, characterized in that:

Shield the disturbance signal during the period from the sudden change of generator load to the disturbance signal attenuation to zero, so that the disturbance signal does not enter the load controller of the speed control system, so as to eliminate the reverse adjustment of steam turbine power.

A method for suppressing power reversal by shielding interference signals at the beginning of generator load mutation, characterized in that the method includes the following four steps:

(1) Measure the generator power signal and steam turbine speed signal in real time, and obtain the steam turbine power given command from the speed control system in real time, calculate the instantaneous change rate of generator power, steam turbine power given command instantaneous change rate, and steam turbine power given command in - the amount of change within a set time, the instantaneous rate of change of the speed of the steam turbine;

(2) Identify whether the sudden change in generator power is caused by a sudden change in generator load according to the following judging conditions, which include:

Judgment condition 1: Whether the instantaneous change rate of the generator power exceeds the specified threshold range of the instantaneous change rate of the generator power,

Judgment condition 2: Whether the instantaneous change rate of the steam turbine power given command is within the specified threshold range of the instantaneous change rate of the steam turbine power given command,

Judgment condition 3: Whether the change amount of the steam turbine power given command within a set time is within the specified change amount threshold range,

Judgment condition four: Whether the instantaneous change rate of the steam turbine speed exceeds the specified threshold range of the instantaneous change rate of the steam turbine speed;

(3) When the four judgment conditions in step (2) are all true, that is, the instantaneous change rate of generator power exceeds the specified threshold range of generator power instantaneous change rate, and the instantaneous change rate of steam turbine power given command is within the specified steam turbine power The instantaneous rate of change of the given power command is within the threshold range, and the change of the given command of the steam turbine within a set time is within the specified change threshold range, and the instantaneous change rate of the steam turbine speed exceeds the specified threshold of the instantaneous change rate of the steam turbine speed range, it is judged that the sudden change of generator power is caused by the sudden change of generator load, and an output maintenance command is issued to the load controller of the speed control system to shield the interference signal and suppress the reverse adjustment of generator power. Normal adjustment according to the frequency difference;

(4) When the four judgment conditions in step (2) are different and true at the same time, it is judged that the generator power mutation is not caused by the generator load mutation, and the load controller of the speed control system is normally adjusted according to the load controller deviation input, At the same time, the frequency modulation controller of the speed regulation system is normally adjusted according to the frequency difference.

The present invention further preferably has the following technical solutions.

In the first judgment condition of the step (2), when the absolute value of the instantaneous rate of change of the generator power is greater than the absolute value of the threshold absolute value of the instantaneous rate of change of the generator power, it is considered that the threshold range of the instantaneous rate of change of the generator power is exceeded, The judgment condition one is true;

When the generator power instantaneous change rate threshold is greater than zero, that is, the generator power instantaneous change rate exceeds the limit in the positive direction, and the threshold value at this time can be taken within the range of +0.5% to +6% generator rated active power/second;

When the generator power instantaneous change rate threshold is less than zero, that is, the generator power instantaneous change rate exceeds the limit in the negative direction, the threshold at this time can be in the range of -0.5% to -6% of the generator rated active power/s.

In the second judgment condition of the step (2), when the absolute value of the instantaneous rate of change of the given steam turbine power command is not greater than the specified absolute value of the instantaneous rate of change threshold of the given steam turbine power command, it is considered that the given steam turbine power command is instantaneous If the rate of change is within the threshold range of the instantaneous rate of change of the specified steam turbine power command, the second judgment condition is true;

When the instantaneous rate of change of the steam turbine power command is greater than zero, it means that the instantaneous rate of change of the steam turbine power command exceeds the limit in the positive direction. At this time, the threshold value of the instantaneous rate of change of the steam turbine power command can be +0.05% to +4% The value is taken within the range of active power/second, and the threshold of the instantaneous change rate of the steam turbine power given command is preferably +2% of the rated active power/second of the generator;

When the instantaneous rate of change of the steam turbine power command is less than zero, it means that the instantaneous rate of change of the steam turbine power command exceeds the limit in the negative direction. At this time, the threshold value of the instantaneous rate of change of the steam turbine power command can be -0.05% to -4% The value is selected within the range of active power/second, and the threshold value of the instantaneous change rate of the steam turbine power given command is preferably -2% of the rated active power/second of the generator.

In the third judgment condition of the step (2), when the absolute value of the change amount of the steam turbine power given command is not greater than the absolute value of the specified change threshold value, it is considered that the change amount of the steam turbine power is within the specified change amount Within the threshold range, the judgment condition three is true;

When the variation of the steam turbine power given instruction is greater than zero, the positive direction of the variation of the steam turbine power given instruction exceeds the limit. At this time, the set time is 1 second to 20 seconds, preferably 5 seconds, and the threshold value of the variation is +0.5 % to +8% of the rated active power of the generator, preferably +4% of the rated active power of the generator;

When the variation of the steam turbine power given instruction is less than zero, the negative direction of the variation of the steam turbine power given instruction exceeds the limit. At this time, the set time is 1 second to 20 seconds, preferably 5 seconds, and the threshold value of the variation is -0.5 % to -8% of the rated active power of the generator, preferably -4% of the rated active power of the generator.

In the fourth judgment condition of the step (2), when the absolute value of the instantaneous change rate of the steam turbine speed is greater than the absolute value of the specified threshold value of the instantaneous change rate of the steam turbine speed, it is considered that the instantaneous change rate of the steam turbine speed exceeds the specified instantaneous change rate of the steam turbine speed Change rate threshold range, the judgment condition four is true; when the instantaneous change rate of the steam turbine speed is greater than zero, the positive direction of the instantaneous change of the steam turbine speed exceeds the limit, and the threshold value of the instantaneous change rate of the steam turbine speed is +1 to +60 r/min/min Take a value between, preferably +10 rev/min/min;

When the instantaneous change rate of the steam turbine speed is less than zero, the negative direction of the instantaneous change of the steam turbine speed exceeds the limit, and the threshold value of the instantaneous change rate of the steam turbine speed is between -1 and -60 rpm/min, preferably -10 rpm/min/ point.

The output holding instruction in the step (3) begins to issue when four judgment conditions are true simultaneously in the step (2) for the first time, and the duration of the output holding instruction is carried out according to the preset duration parameter, and the preset duration parameter The value range is from 0.1 seconds to 1.0 seconds. The output hold command is canceled after the duration is over, and the output hold command cannot be issued to the load controller again within the preset block time. The value range of the preset block time parameter is 10 seconds to 300 seconds.

In the step (3), the load controller output of the speed regulating system can be kept constant by replacing the load controller deviation input with a constant 0.

Compared with the prior art, the present application has the following innovations:

1) Observing and suppressing the anti-tuning phenomenon in the time domain;

2) Observing and suppressing the anti-tuning phenomenon from the control law of PID itself.

Compared with the prior art, the present application has the following significant advantages:

1) The improvement method for the debugging system has simple steps, is not easy to make mistakes, and is easy to implement in engineering practice;

2) The parameters involved in the scheme of the present application are easy to set and have strong versatility;

3) This application only takes effect for a short time when the generator load changes suddenly, and has no effect on the original speed control system control strategy in other time periods.

4) This application will not introduce interference signals, let alone amplify interference signals.

Description of drawings

Fig. 1 is a block flow diagram of a method for suppressing power reverse adjustment disclosed by the present invention;

Fig. 2 is a logical block diagram of the method for suppressing power reverse adjustment in the present invention;

Among them: P _E —generator power signal, P _ref —steam turbine power given command, ω—steam turbine speed, —Instantaneous change rate of generator power, —Instantaneous rate of change of steam turbine power given command, ΔP _{ref —Variation} of steam turbine power given command, —Turbine speed instantaneous change rate, 1—speed module, 2—comparison module, 3—comparison fixed value setting module, 4—comparison module, 5—comparison fixed value setting module, 6—OR gate, 7—speed module, 8—comparison module, 9—comparison fixed value setting module, 10—comparison module, 11—comparison fixed value setting module, 12—NOR gate, 13—first-order inertia module, 14—lead lag module, 15—lead Lag module, 16—comparison module, 17—comparison fixed value setting module, 18—comparison module, 19—comparison fixed value setting module, 20—NOR gate, 21—speed module, 22—comparison module, 23—comparison Fixed value setting module, 24—comparison module, 25—comparative fixed value setting module, 26—OR gate, 27—AND gate, 28—pulse timing module, 29—block timing fixed value setting module, 30—pulse timing Modules, 31—maintain timing fixed value setting module, 32—controllable switch, 33—constant value assignment module, 34—load controller deviation input module, 35—load controller PID module.

detailed description

The present invention will be further described below in conjunction with drawings and embodiments.

The basic idea of the method of the present invention is that the interference signal that causes the reverse adjustment of the steam turbine power is generated when the external load of the generator spontaneously changes, and the interference signal is the strongest at the time of the sudden change, and decays rapidly with time, and the external load sudden change is less than or equal to the frequency modulation controller Disappears when the output changes. The interference signal works on the load controller, but has no effect on the frequency modulation controller. Therefore, as long as the output of the load controller remains unchanged when the external load of the generator spontaneously changes, the interference signal can be shielded and filtered. When the attenuation reaches zero, restore the load controller to normal adjustment in time, so as to solve the problem of reverse adjustment of steam turbine power.

The most important parameter in the method of the present invention is the length of time for which the output of the load controller remains constant. According to the characteristics of the interference signal being strong at the beginning and then weak at the end, the influence effect is the most obvious when the interference signal is generated, and the effect becomes weaker at the later stage. It can be seen that even if there is a certain error in the actual setting of the time parameter, as long as the duration can cover most of the time from the beginning of the interference signal to its disappearance, the difference is very small in terms of the effect of solving the reverse adjustment of the steam turbine power of. In this way, in actual engineering, this parameter is relatively easy to set and has strong versatility.

Using the method shown in Figure 1 to shield the interference signal at the beginning of the generator load mutation and suppress the power reverse adjustment method is divided into four steps:

(1) Measure the generator power signal and steam turbine speed signal in real time, and obtain the steam turbine power given command from the speed control system in real time, calculate the instantaneous change rate of generator power, steam turbine power given command instantaneous change rate, and steam turbine power given command in The amount of change within a set time, the instantaneous rate of change of the steam turbine speed; (2) identify whether the generator power mutation is caused by the generator load mutation according to the following judgment conditions, and the judgment conditions include:

Judgment condition 1: Whether the instantaneous change rate of the generator power exceeds the specified range of the threshold value of the instantaneous change rate of the generator power. The threshold range of the instantaneous rate of change of the generator power is specified, and the judgment condition 1 is true;

When the generator power instantaneous change rate threshold is greater than zero, that is, the generator power instantaneous change rate exceeds the limit in the positive direction, the threshold value at this time can be set within the range of +0.5% to +6% generator rated active power/s, Preferably, the threshold of the instantaneous change rate of the generator power is +4% of the rated active power of the generator per second.

When the generator power instantaneous change rate threshold is less than zero, that is, the generator power instantaneous change rate exceeds the limit in the negative direction, the threshold value at this time can be set within the range of -0.5% to -6% generator rated active power/s, Preferably, the threshold of the instantaneous change rate of generator power is -4% of the rated active power of the generator per second.

Judgment condition 2: Whether the instantaneous change rate of the steam turbine power given command is within the specified threshold range of the instantaneous change rate of the steam turbine power given command, when the absolute value of the instantaneous change rate of the steam turbine power given command is not greater than the specified instantaneous change of the steam turbine power given command When the absolute value of the power threshold is determined, it is considered that the instantaneous rate of change of the given steam turbine power command is within the specified threshold range of the instantaneous rate of change of the given steam turbine power command, and the second judgment condition is true;

When the instantaneous rate of change of the steam turbine power command is greater than zero, it means that the instantaneous rate of change of the steam turbine power command exceeds the limit in the positive direction. At this time, the threshold value of the instantaneous rate of change of the steam turbine power command can be +0.05% to +4% The value is taken within the range of active power/second, and the threshold of the instantaneous change rate of the steam turbine power given command is preferably +2% of the rated active power/second of the generator;

When the instantaneous rate of change of the steam turbine power command is less than zero, it means that the instantaneous rate of change of the steam turbine power command exceeds the limit in the negative direction. At this time, the threshold value of the instantaneous rate of change of the steam turbine power command can be -0.05% to -4% The value is taken within the range of active power/second, and the threshold of the instantaneous change rate of the steam turbine power given command is preferably -2% of the rated active power/second of the generator;

Judgment condition 3: Whether the variation of the steam turbine power given command within a set time is within the specified variation threshold range, when the absolute value of the variation of the steam turbine power given command is not greater than the absolute value of the specified variation threshold value, it is considered that the variation of the steam turbine power is within the specified variation threshold range, and the judgment condition three is true;

When the variation of the steam turbine power given instruction is greater than zero, the positive direction of the variation of the steam turbine power given instruction exceeds the limit. At this time, the set time is 1 second to 20 seconds, preferably 5 seconds, and the threshold value of the variation is +0.5 % to +8% of the rated active power of the generator, preferably +4% of the rated active power of the generator;

When the variation of the steam turbine power given instruction is less than zero, the negative direction of the variation of the steam turbine power given instruction exceeds the limit. At this time, the set time is 1 second to 20 seconds, preferably 5 seconds. The threshold of the variation is - The value is within the range of 0.5% to -8% of the rated active power of the generator, preferably -4% of the rated active power of the generator;

Judgment condition 4: Whether the instantaneous change rate of the steam turbine speed exceeds the specified range of the threshold value range of the instantaneous change rate of the steam turbine speed; If the rate of change exceeds the specified threshold range of the instantaneous change rate of the steam turbine speed, the judgment condition four is true; when the instantaneous change rate of the steam turbine speed is greater than zero, the positive direction of the instantaneous change of the steam turbine speed exceeds the limit, and the threshold value of the instantaneous change rate of the steam turbine speed is within + Values between 1 and +60 rpm/min, preferably +10 rpm/min;

When the instantaneous change rate of the steam turbine speed is less than zero, the negative direction of the instantaneous change of the steam turbine speed exceeds the limit, and the threshold value of the instantaneous change rate of the steam turbine speed is between -1 and -60 rpm/min, preferably -10 rpm/min/ Minute;

(3) When the four judgment conditions in step (2) are all true, that is, the instantaneous change rate of generator power exceeds the specified threshold range of generator power instantaneous change rate, and the instantaneous change rate of steam turbine power given command is within the specified steam turbine power The instantaneous rate of change of the given power command is within the threshold range, and the change of the given command of the steam turbine within a set time is within the specified change threshold range, and the instantaneous change rate of the steam turbine speed exceeds the specified threshold of the instantaneous change rate of the steam turbine speed When it is judged that the sudden change of generator power is caused by the sudden change of generator load, an output maintenance command is issued to the load controller of the speed control system to shield the interference signal and suppress the reverse adjustment of generator power. At the same time, the frequency modulation controller of the speed control system is Frequency difference normal adjustment;

The output holding instruction in the step (3) begins to issue when four judgment conditions are true simultaneously in the step (2) for the first time, and the duration of the output holding instruction is carried out according to the preset duration parameter, and the preset duration parameter The value range is from 0.1 seconds to 1.0 seconds. The output hold command is canceled after the duration is over, and the output hold command cannot be issued to the load controller again within the preset block time. The value range of the preset block time parameter is 10 seconds to 300 seconds.

In the step (3), the load controller output of the speed regulating system can be kept constant by replacing the load controller deviation input with a constant 0.

(4) When the four judgment conditions in step (2) are different and true at the same time, it is judged that the generator power mutation is not caused by the generator load mutation, and the load controller of the speed control system is normally adjusted according to the load controller deviation input, At the same time, the frequency modulation controller of the speed regulation system is normally adjusted according to the frequency difference.

Example 1

Further description will be made below in conjunction with accompanying drawing 2.

The logic block diagram of shielding the interference signal and suppressing the power reverse adjustment at the beginning of the generator load mutation, including: generator power signal P _E , steam turbine power given command P _ref , steam turbine speed ω, generator power instantaneous change rate Instantaneous change rate of steam turbine power given command Turbine power given command variation ΔP _ref , steam turbine speed instantaneous change rate Speed module 1, comparison module 2, comparison fixed value setting module 3, comparison module 4, comparison fixed value setting module 5, OR gate 6, speed module 7, comparison module 8, comparison fixed value setting module 9, comparison module 10. Comparison fixed value setting module 11, NOR gate 12, first-order inertia module 13, lead lag module 14, lead lag module 15, comparison module 16, comparison fixed value setting module 17, comparison module 18, comparison fixed value Setting module 19, NOR gate 20, rate module 21, comparison module 22, comparative fixed value setting module 23, comparison module 24, comparative fixed value setting module 25, OR gate 26, AND gate 27, pulse timing module 28 , block timing fixed value setting module 29, pulse timing module 30, hold timing fixed value setting module 31, controllable switch 32, constant value assignment module 33, load controller deviation input module 34, load controller PID module 35, The input end of the rate module 1 is connected to the generator power signal P _E , and the output is the instantaneous rate of change of the generator power The output end of the rate module 1 is connected to the input end of the comparison module 2, and the comparison fixed value setting module 3 is connected to the input end of the comparison module 2 for setting the comparison fixed value of the comparison module 2, and the comparison module 2 The output terminal of the said rate module 1 is connected to the input terminal of the comparison module 4, and the comparison fixed value setting module 5 is connected to the input terminal of the comparison module 4 for setting the comparison module 4. The comparative fixed value of module 4, the output terminal of described comparison module 4 is connected to the input terminal of OR gate 6, the output terminal of described OR gate 6 is connected to the input terminal of AND gate 27, and the input terminal of described rate module 7 is connected Turbine power given command P _ref , the output is the instantaneous rate of change of steam turbine power given command The output terminal of the rate module 7 is connected to the input terminal of the comparison module 8, and the comparison fixed value setting module 9 is connected to the input terminal of the comparison module 8 for setting the comparison fixed value of the comparison module 8. The comparison module 8 The output terminal of the rate module 7 is connected to the input terminal of the NOR gate 12, the output terminal of the rate module 7 is connected to the input terminal of the comparison module 10, and the comparison fixed value setting module 11 is connected to the input terminal of the comparison module 10 for setting The comparative fixed value of the comparison module 10, the output terminal of the comparison module 10 is connected to the input terminal of the NOR gate 12, and the output terminal of the NOR gate 12 is connected to the input terminal of the AND gate 27, and the first-order inertial module The input end of 13 is connected to the steam turbine power given command _Pref , the output end of the first-order inertia module 13 is connected to the input end of the lead-lag module 14, and the output end of the lead-lag module 14 is connected to the input end of the lead-lag module 15, The output of the lead-lag module 15 is the steam turbine power given instruction variation ΔP _ref , the output end of the lead-lag module 15 is connected to the input end of the comparison module 16, and the comparison fixed value setting module 17 is connected to the comparison module 16. The input end is used to set the comparative fixed value of the comparison module 16, the output end of the comparison module 16 is connected to the input end of the NOR gate 20, the output end of the lead-lag module 15 is connected to the input end of the comparison module 18, The comparison fixed value setting module 19 is connected to the input end of the comparison module 18 for setting the comparison fixed value of the comparison module 18, the output end of the comparison module 18 is connected to the input end of the NOR gate 20, and the OR The output end of the NOT gate 20 is connected to the input end of the AND gate 27, the input end of the rate module 21 is connected to the steam turbine speed ω, and the output is the instantaneous rate of change of the steam turbine speed The output end of the rate module 21 is connected to the input end of the comparison module 22, and the comparison fixed value setting module 23 is connected to the input end of the comparison module 22 for setting the comparison fixed value of the comparison module 22. The comparison module 22 The output terminal of the speed module 21 is connected to the input terminal of the OR gate 26, the output terminal of the speed module 21 is connected to the input terminal of the comparison module 24, and the comparison fixed value setting module 25 is connected to the input terminal of the comparison module 24 for setting comparison The comparison fixed value of module 24, the output terminal of described comparison module 24 is connected to the input terminal of OR gate 26, and the output terminal of described OR gate 26 is connected to the input terminal of AND gate 27, and the output terminal of described AND gate 27 is connected To the input end of pulse timing module 28, described blocking timing fixed value setting module 29 connects the input end of pulse timing module 28, is used to set the pulse duration of pulse timing module 28, the output end of described pulse timing module 28 Be connected to the input end of pulse timing module 30, described maintenance timing fixed value setting module 31 connects the input end of pulse timing module 30, is used to set the pulse duration of pulse timing module 30, the output of described pulse timing module 30 terminal is connected to the control terminal of the controllable switch 32, the output terminal of the constant assignment module 33 and the output terminal of the load controller deviation input module 34 are connected to the input terminal of the controllable switch 32, and the controllable switch 32 The output terminal of is connected to the input terminal of the PID module 35 of the load controller.

The transfer function of the first-order inertia module 13 is:

${\mathrm{<span\; class="notranslate">\; G</span>}}_{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; the\; s</span>}}$

Among them, K ₁ is the proportional coefficient, and D ₁ is the inertial time constant.

The transfer function of the lead-lag module 14 is:

${\mathrm{<span\; class="notranslate">\; G</span>}}_{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; the\; s</span>}}$

Among them, K ₂ is the differential amplification factor, and D ₂ is the inertial time constant.

The transfer function of the lead-lag module 15 is:

${\mathrm{<span\; class="notranslate">\; G</span>}}_{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}\mathrm{<span\; class="notranslate">\; the\; s</span>}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}\mathrm{<span\; class="notranslate">\; the\; s</span>}}$

Among them, K ₃ is the differential amplification factor, and D ₃ is the inertial time constant.

Through the first-order inertia module 13, the steam turbine power given command is standardized, that is, the steam turbine power given command with different capacities is converted into the range of 0 to 100, and the steam turbine power given command is passed through a short time lag, It is used to match the action response of steam turbine valves.

Through the lead-lag module 14, the amount of change within a certain period of time is extracted from the given order of steam turbine power after the punit, and the change amount of the given order of the steam turbine power after the punit is accelerated within a certain period of time by the lead-lag module 15, changing Its change rate is to shorten its change cycle, so that the change rate of the change amount within a certain period of time matches the change rate of the steam turbine power given command.

The method of shielding the interference signal and suppressing the power reverse adjustment at the beginning of the generator load mutation is divided into four steps:

(1) Measure the generator power signal and steam turbine speed signal in real time, and obtain the steam turbine power command from the CCS coordination controller in real time, and calculate the instantaneous change rate of generator power, steam turbine power command instantaneous change rate, and steam turbine power command The amount of change within a set time, the instantaneous rate of change of the speed of the steam turbine;

The generator power signal _PE is the generator power signal whose value is in the middle of the three generator power signals, and the generator power signal _{PE passes} through a rate module 1 to obtain the instantaneous rate of change of the generator power

The steam turbine power given command is the value after the rate limit in the CCS coordination controller, and the steam turbine power given command P _ref passes through a rate module 7 to obtain the instantaneous rate of change of the steam turbine power given command

The given steam turbine power command P _ref passes through the first-order inertia module 13, the lead-lag module 14, and the lead-lag module 15 in order to obtain the steam turbine power given command variation ΔP _ref ;

The steam turbine speed signal ω is the value of the three steam turbine speed signals after being judged by the logic of the three, and the steam turbine speed signal ω passes through a rate module 21 to obtain the instantaneous rate of change of the steam turbine speed

(2) Identify whether the sudden change in generator power is caused by a sudden change in generator load according to the following judging conditions, which include:

Judgment condition one: whether the instantaneous change rate of generator power exceeds the specified threshold range of the instantaneous change rate of generator power.

When the instantaneous rate of change of generator power When , the comparison module 2 and the comparison fixed value setting module 3 constitute the generator power instantaneous change rate Comparing and judging whether the positive direction exceeds the limit; when the instantaneous change rate of generator power When , the comparison module 4 and the comparison fixed value setting module 5 constitute the instantaneous change rate of generator power Comparing and judging whether the negative direction exceeds the limit. When the output is true, it represents the instantaneous rate of change of generator power The limit is exceeded in the positive direction. When the output of the comparison module 4 is true, it represents the instantaneous rate of change of the generator power Negative direction over limit. When any output of the comparison module 2 or the comparison module 4 is true, the output of the OR gate 6 is true; otherwise, the output of the OR gate 6 is false. When the output of the OR gate 6 is true, it means that the condition 1 is established, and when the output of the OR gate 6 is false, it means that the condition 1 is not established.

in:

The output fixed value of the comparative fixed value setting module 3 is +4% of the rated active power of the generator/second, and the selectable value range is from +0.5% to +6% of the rated active power of the generator/second;

The output value of the comparative fixed value setting module 5 is -4% of the rated active power of the generator/second, and the selectable value range is from -0.5% to -6% of the rated active power of the generator/second;

Judgment condition two: whether the instantaneous rate of change of the given command of the steam turbine power is within the threshold range of the instantaneous rate of change of the given command of the steam turbine power.

When the steam turbine power command instantaneous change rate When , the comparison module 8 and the comparison fixed value setting module 9 constitute the instantaneous change rate of the steam turbine power given command Comparing and judging whether the positive direction exceeds the limit; when the instantaneous change rate of the steam turbine power given instruction When , the comparison module 10 and the comparison fixed value setting module 11 constitute the instantaneous change rate of the steam turbine power given command Comparing and judging whether the negative direction exceeds the limit. When the output of the comparison module 8 is true, it represents the instantaneous rate of change of the steam turbine power given command The limit is exceeded in the positive direction. When the output of the comparison module 10 is true, it represents the instantaneous rate of change of the steam turbine power given command. Negative direction over limit. When any output of the comparison module 8 or the comparison module 10 is true, the output of the NOR gate 12 is false; otherwise, the output of the NOR gate 12 is true. When the output of the NOR gate 12 is true, it means that the condition 2 is established, and when the output of the NOR gate 12 is false, it means that the condition 2 is not established.

in:

The output fixed value of the comparative fixed value setting module 9 is +2% of the rated active power of the generator/second, and the selectable value range is from +0.05% to +4% of the rated active power of the generator/second;

The output fixed value of the comparative fixed value setting module 11 is -2% of the rated active power of the generator/second, and the selectable value range is from -0.05% to -4% of the rated active power of the generator/second;

Judgment condition three: whether the change amount of the steam turbine power given command within a set time is within the specified change amount threshold range.

When the steam turbine power given command variation ΔP _ref >0, the comparison module 16 and the comparison fixed value setting module 17 constitute a comparative judgment on whether the positive direction of the steam turbine power given command variation ΔP _ref exceeds the limit; When the fixed command variation ΔP _ref <0, the comparison module 18 and the comparison constant value setting module 19 constitute a comparative judgment on whether the steam turbine power given command variation ΔP _ref exceeds the limit in the negative direction. When the output of the comparison module 16 is true, it means that the steam turbine power given command variation ΔP _{ref exceeds} the limit in the positive direction; when the output of the comparison module 18 is true, it means that the steam turbine power given command variation ΔP _{ref exceeds} the limit in the negative direction. When any output of the comparison module 16 or the comparison module 18 is true, the output of the NOR gate 20 is false; otherwise, the output of the NOR gate 20 is true. When the output of the NOR gate 20 is true, it means that the condition 3 is established, and when the output of the NOR gate 20 is false, it means that the condition 3 is not established.

in:

The proportional coefficient K of the _first -order inertia link 13 is _The inertial time constant D1 is 0.02 seconds;

The differential amplification factor K ₂ of the lead-lag module 14 is 5, and the inertial time constant D ₂ is 5 seconds;

The differential amplification factor K ₃ of the lead-lag module 15 is 5, and the inertial time constant D ₃ is 5 seconds;

The output of the comparative fixed value setting module 17 is +4% of the rated active power of the generator, and the selectable value range is from +0.5% to +8% of the rated active power of the generator;

The output of the comparative fixed value setting module 19 is -4% of the rated active power of the generator, and the selectable value range is from +0.5% to +8% of the rated active power of the generator.

Judgment condition four: Whether the instantaneous change rate of the steam turbine speed exceeds the specified threshold range of the instantaneous change rate of the steam turbine speed;

The steam turbine speed ω is the steam turbine speed signal whose numerical value is in the middle among the three steam turbine speed signals, and the value passes through a rate module 21 to obtain the instantaneous change rate of the steam turbine speed when When , the comparison module 22 and the comparison fixed value setting module 23 constitute the instantaneous rate of change of the steam turbine speed Comparing and judging whether the positive direction exceeds the limit; When , the comparison module 24 and the comparison fixed value setting module 25 constitute the instantaneous rate of change of the steam turbine speed Comparing and judging whether the negative direction exceeds the limit. When the output of the comparison module 22 is true, it represents the instantaneous rate of change of the steam turbine speed The limit is exceeded in the positive direction, when the output of the comparison module 24 is true, it represents the instantaneous rate of change of the steam turbine speed Negative direction over limit. When any output of the comparison module 22 or the comparison module 24 is true, the output of the OR gate 26 is true; otherwise, the output of the OR gate 26 is false. When the output of the OR gate 26 is true, it means that the condition 4 is established, and when the output of the OR gate 26 is false, it means that the condition 4 is not established.

in:

The output of comparative fixed value setting module 23 is +10 rev/min/min, and the selectable value range is +1 to +60 rev/min/min;

The output of the comparative fixed value setting module 25 is -10 rpm/min, and the selectable value range is from -1 to -60 rpm/min.

The result of judgment condition 1 is the output of OR gate 6, the result of judgment condition 2 is the output of NOR gate 12, the result of judgment condition 3 is the output of NOR gate 20, the result of judgment condition 4 is the output of OR gate 26, The output of these 4 modules is used as the input of the AND gate 27. Only when the outputs of the 4 modules are all true, that is, when the judgment conditions 1, 2, 3, and 4 are all true, the output of the AND gate 27 is true, otherwise the gate The output of 27 is false.

The output of the AND gate 27 is true, which means that the judgment result of step (2) is true, otherwise the judgment result of step (2) is false.

(3) When the four judgment conditions in step (2) are all true, that is, the instantaneous change rate of generator power exceeds the specified threshold range of generator power instantaneous change rate, and the instantaneous change rate of steam turbine power given command exceeds the specified steam turbine When the threshold range of the instantaneous change rate of the power given command is exceeded, and the change of the steam turbine power given command exceeds the specified change threshold range within a set time, and the instantaneous change rate of the steam turbine speed exceeds the specified threshold range of the instantaneous change rate of the steam turbine speed , it is judged that the sudden change of generator power is caused by the sudden change of generator load, and an output maintenance command is issued to the load controller to shield the interference signal and suppress the reverse adjustment of generator power, and at the same time, the frequency modulation controller is normally adjusted according to the frequency difference;

The output holding instruction in the step (3) begins to issue when four judgment conditions are true simultaneously in the step (2) for the first time, and the duration of the output holding instruction is carried out according to the preset duration parameter, and the preset duration parameter The value range is from 0.1 seconds to 1.0 seconds. The output hold command is canceled after the duration is over, and the output hold command cannot be issued to the load controller again within the preset block time. The value range of the preset block time parameter is 10 seconds to 300 seconds.

If the judgment result of step (2) is true, the output of the AND gate 27 is true, otherwise the output of the AND gate 27 is false. And gate 27 has realized by pulse timing module 28 and blocking timing fixed value setting module 29 when AND gate 27 is true for the first time, triggers the pulse signal of a longer time, because pulse timing module 28 only from false to its input signal Detect to true change state, even if the input signal of pulse timing module 28 has a plurality of changing states from false to true within the duration of pulse timing, the output of pulse timing module 28 will not change to true state. In this way, the pulse timing module 28 has realized that the possible multiple output of the AND gate 27 from false to true is converted into an output from false to true in the duration of the lock timing fixed value setting module 29, and the pulse timing Module 28 responds only to the first false-to-true output of AND gate 27.

The pulse timing module 28 has realized the issuing of the output holding instruction through the pulse timing module 30 and the holding timing fixed value setting module 31, the output of the pulse timing module 30 is the output holding instruction, and the holding timing fixed value setting module 31 has set the output holding The duration of the command. The output of the pulse timing module 30 is the output hold instruction.

The duration of the output hold command can be obtained according to the measured parameters of the generator set speed control system model and the simulation analysis results under various accident states of the regional power grid where the generator set is located. The duration of the interference signal in various accident states can be simulated and calculated, and then the median value is taken as the duration of the output hold command, that is, the set value of the hold timing constant value setting module 31 .

in:

The output of the blocking timing fixed value setting module 29 is 10 seconds, and the selectable value range is 10 seconds to 300 seconds;

The output of the timing constant value setting module 31 is kept at 0.3 seconds, and the selectable value range is from 0.1 seconds to 1.0 seconds.

In the step (3), the load controller output can be kept constant by replacing the load controller deviation input with a constant 0.

The pulse timing module 30 controls whether the input signal of the load controller PID module 35 is the constant value assignment module 33 or the load controller deviation input module 34 through the controllable switch 32 . When the selected input signal is the constant assignment module 33, because the output value of the constant assignment module 33 is 0, according to the calculation principle of the PID module, the output of the load controller PID module 35 will remain unchanged; when the selected input signal is When the load controller deviation is input to the module 34, then the load controller PID module 35 adjusts in the normal manner.

When the four judgment conditions in step (2) are true at the same time, the output of the AND gate 27 is true, and the pulse timing module 30 controls the controllable switch 32 to select the constant assignment module 33 as the input signal of the load controller PID module 35 . Since the output value of the constant assignment module 33 is 0, according to the calculation principle of the PID module, the output of the load controller PID module 35 will remain unchanged. The controllable toggle switch 32 selects the load controller deviation input module 34 as the input signal to the load controller PID module 35 when the output of the pulse timing module 30 is withdrawn after the duration expires.

Since the FM controller is not changed, it has been adjusted normally according to the frequency difference.

in:

The output of the constant assignment module 33 is 0;

(4) When the four judgment conditions in step (2) are different and true at the same time, it is judged that the generator power mutation is not caused by the generator load mutation, and the load controller is normally adjusted according to the load controller deviation input, and the frequency modulation control The transmitter is normally adjusted according to the frequency difference.

When the 4 judging conditions in step (2) are not true at the same time, the AND gate 27 output is false, the output of the pulse timing module 30, that is, the output hold instruction is always false, and the controllable switch 32 always selects the load controller deviation input module 34 is controlled as the input signal of the PID module 35 of the load controller.

Since the FM controller is not changed, it has been adjusted normally according to the frequency difference.

Above is that the applicant of the present application has done a detailed description and description of the embodiments of the present application in conjunction with the accompanying drawings, but those skilled in the art should understand that the above embodiments are only preferred implementations of the present application, and the detailed description is only to help Readers can better understand the spirit of the present invention, but not limit the protection scope of the application. On the contrary, any improvement or modification made based on the spirit of the invention of the application should fall within the protection scope of the application.

Claims (10)

1. one kind is suppressed the anti-method adjusted of power by generator load sudden change start time shielding interference signal, it is characterised in that Described method comprises following four step:

(1) measure dynamo power signal, turbine speed signal in real time, and obtain steam turbine power from governing system in real time Given instruction, calculating generator power instantaneous rate of change, steam turbine power given instruction instantaneous rate of change, steam turbine power are given Determine instruction variable quantity within the setting time, turbine speed instantaneous rate of change；

(2) whether caused by generator load sudden change according to the sudden change of following Rule of judgment identification generator power, described judgement bar Part includes:

Rule of judgment one: whether generator power instantaneous rate of change exceedes the generator power instantaneous rate of change threshold range of regulation,

Rule of judgment two: it is the most instantaneous in the given instruction of steam turbine power of regulation that steam turbine power gives instruction instantaneous rate of change In rate of change threshold range,

Rule of judgment three: whether steam turbine power gives instruction variable quantity within the setting time in the variable quantity threshold value specified In the range of,

Rule of judgment four: whether turbine speed instantaneous rate of change exceedes the turbine speed instantaneous rate of change threshold range of regulation；

(3) when in step (2) 4 Rule of judgment be true time, i.e. generator power instantaneous rate of change exceed regulation send out Power of motor instantaneous rate of change threshold range, and steam turbine power give instruction instantaneous rate of change regulation steam turbine power In given instruction instantaneous rate of change threshold range, and steam turbine power gives instruction variable quantity within the setting time on rule In fixed variable quantity threshold range, and turbine speed instantaneous rate of change exceedes the turbine speed instantaneous rate of change threshold of regulation During value scope, then judge that generator power sudden change is caused, to the load governor of governing system by generator load sudden change Assigning to export and keep instruction, generator power is counter to be adjusted to disturb signal to suppress with shielding, the frequency modulation control device to governing system simultaneously According to frequency difference normal regulating；

(4) it is true time when 4 Rule of judgment differences in step (2), it is judged that generator power sudden change is not by electromotor Sudden load change causes, and according to load governor deviation, the load governor of governing system is inputted normal regulating, exchanges simultaneously The frequency modulation control device of speed system is according to frequency difference normal regulating.

The shielding interference signal suppression anti-method adjusted of power the most according to claim 1, it is characterised in that:

In the Rule of judgment one of described step (2), when generator power instantaneous rate of change absolute value is more than the electromotor merit of regulation During rate instantaneous rate of change threshold value absolute value, then it is assumed that having exceeded the generator power instantaneous rate of change threshold range of regulation, this is sentenced Broken strip part one is true；

When generator power instantaneous rate of change threshold is more than zero, i.e. generator power instantaneous rate of change positive direction is out-of-limit, now Threshold value is value in the range of+0.5% to+6% electromotor specified active power/second；

When generator power instantaneous rate of change threshold is less than zero, i.e. generator power instantaneous rate of change negative direction is out-of-limit, now Threshold value is value in the range of-0.5% to-6% electromotor specified active power/second.

The shielding interference signal suppression anti-method adjusted of power the most according to claim 1, it is characterised in that:

In the Rule of judgment two of described step (2), when steam turbine power given instruction instantaneous rate of change absolute value is not more than regulation Steam turbine power given instruction instantaneous rate of change threshold value absolute value time, then it is assumed that described steam turbine power is given instructs instantaneous change Rate is in the steam turbine power given instruction instantaneous rate of change threshold range of regulation, and this Rule of judgment two is true；

When steam turbine power given instruction instantaneous rate of change is more than zero, just representing steam turbine power given instruction instantaneous rate of change Direction is out-of-limit, now steam turbine power given instruction instantaneous rate of change threshold value+0.05% to+4% specified active power of electromotor/ Value in the range of Miao；When steam turbine power given instruction instantaneous rate of change is less than zero, represent the given instruction of steam turbine power Instantaneous rate of change negative direction is out-of-limit, and now steam turbine power given instruction instantaneous rate of change threshold value is at-0.05% to-4% electromotor Value in the range of specified active power/second.

The shielding interference signal suppression anti-method adjusted of power the most according to claim 3, it is characterised in that:

In the Rule of judgment two of described step (2), when steam turbine power given instruction instantaneous rate of change is more than zero, now Steam turbine power given instruction instantaneous rate of change threshold value was+2% electromotor specified active power/second；Refer to when steam turbine power is given When making instantaneous rate of change be less than zero, now steam turbine power given instruction instantaneous rate of change threshold value is that-2% electromotor is specified meritorious Power/second.

The shielding interference signal suppression anti-method adjusted of power the most according to claim 1, it is characterised in that:

In the Rule of judgment three of described step (2), when steam turbine power gives the absolute value no more than regulation of the variable quantity of instruction The absolute value of variable quantity threshold value time, then it is assumed that the variable quantity of described steam turbine power in the variable quantity threshold range of regulation, This Rule of judgment three is true；

When steam turbine power given instruction variable quantity is more than zero, steam turbine power given instruction variable quantity positive direction is out-of-limit, this Time the set time be 1 second to 20 seconds, described variable quantity threshold value is in the range of+0.5% to+8% specified active power of electromotor Value；

When steam turbine power given instruction variable quantity is less than zero, steam turbine power given instruction variable quantity negative direction is out-of-limit, this Time the set time be 1 second to 20 seconds, described variable quantity threshold value is in the range of-0.5% to-8% specified active power of electromotor Value.

The shielding interference signal suppression anti-method adjusted of power the most according to claim 5, it is characterised in that:

In the Rule of judgment three of described step (2), when steam turbine power given instruction variable quantity is more than zero, now set Fixing time is 5 seconds, and described variable quantity threshold value is+4% specified active power of electromotor；

When steam turbine power given instruction variable quantity is less than zero, now the set time is 5 seconds, and described variable quantity threshold value is -4% specified active power of electromotor.

The shielding interference signal suppression anti-method adjusted of power the most according to claim 1, it is characterised in that:

In the Rule of judgment four of described step (2), when described turbine speed instantaneous rate of change absolute value is more than the steamer of regulation During the absolute value of machine rotating speed instantaneous rate of change threshold value, then it is assumed that turbine speed instantaneous rate of change has exceeded the steam turbine of regulation and turned Speed instantaneous rate of change threshold range, this Rule of judgment four is true；

When turbine speed instantaneous rate of change is more than zero, turbine speed transient change positive direction is out-of-limit, and described steam turbine turns Speed instantaneous rate of change threshold value value between+1 to+60 revs/min/point；

When turbine speed instantaneous rate of change is less than zero, turbine speed transient change negative direction is out-of-limit, and described steam turbine turns Speed instantaneous rate of change threshold value value between-1 to-60 revs/min/point.

The shielding interference signal suppression anti-method adjusted of power the most according to claim 7, it is characterised in that:

In the Rule of judgment four of described step (2), when turbine speed instantaneous rate of change is more than zero, described turbine speed Instantaneous rate of change threshold value value is+10 revs/min/points；When turbine speed instantaneous rate of change is less than zero, described steam turbine turns Speed instantaneous rate of change threshold value value is-10 revs/min/points.

The shielding interference signal suppression anti-method adjusted of power the most according to claim 1, it is characterised in that:

Under output in described step (3) keeps instruction four Rule of judgment starts for true time in step (2) the most simultaneously Reaching, output keeps the persistent period of instruction to perform according to the duration parameters preset, the duration parameters value model preset Enclosing is 0.1 second to 1.0 seconds, and output keeps instruction to cancel after the persistent period terminates, and in default blocking time not Again can assign output to load governor and keep instruction, the blocking time parameter value scope preset is 10 seconds to 300 seconds.

The shielding interference signal suppression anti-method adjusted of power the most according to claim 1, it is characterised in that:

In described step (3), make the load governor of governing system by constant 0 replaces load governor deviation input Output keeps constant.