CN103912319A - Rotation speed processing method for ultra-supercritical turboset in rotation speed signal failure - Google Patents

Abstract

The invention relates to a rotation speed processing method for ultra-supercritical turboset in rotation speed signal failure. The method includes: subjecting rotor speed values of speed sensor detection points on a same turbine rotor to subtraction to obtain bias in pairwise comparison, comparing the bias with a threshold to obtain a result, using a 2-of-3 logic method to obtain an actual rotation speed signal fault judgment result, if a rotation speed signal fault is judged, endowing a rotation speed set value to an actual rotation speed value in a previous sampling period before the fault, taking the rotation speed set value as set value input of a rotation speed regulator in a period from determination of the rotation speed signal fault to fault removal, taking the actual rotation speed signal value in the previous sampling period as a regulated variable input of the regulator, keeping output of the regulator and throttle flow unchanged, and keeping the turbine in an operation maintaining stage. Using the method can improve reliability in operation of the ultra-supercritical turboset and reduce economic loss resulted from rotation speed faults.

Description

Rotating speed processing method when a kind of supercritical turbine group tach signal fault

Technical field

The present invention relates to a kind of detection failure treatment technology, particularly actual speed signal processing method when a kind of supercritical turbine group tach signal fault.

Background technique

The steamer mechanical electronic hydraulic regulatory function of the supercritical turbine group of producing for Shanghai steam turbine plant; in the turbine rotor rotating speed control function of one of function; the decision logic that contains actual speed signal; but do not possess the output of judged result; in original system logic, need only tach signal simultaneously and be judged as fault; logic is carried out the shutdown of steam turbine automatically; this design logic; cause the judgement of the actual speed signal of original system not quote; can cause because of actual speed signal fault the shutdown of steam turbine simultaneously, cause economic loss.For this defect existing in former design logic, for improving the reliability of unit operation, speed setting value while being necessary to set up tach signal fault in original system logic keeps function, keep entering the constant of steam turbine acting steam flow with this, and form a kind of multifarious relation with original tach signal diagnostic logic.

The present invention can be in the situation that tach signal fault obtains on-call maintenance recovery; to avoid the shutdown that in former design logic, unit causes because of tach signal fault; effectively retrieve economic loss; therefore, when this invention is a kind of processing tach signal fault, improve the method for the economic reliable operation of supercritical turbine.

Summary of the invention

The present invention be directed to shutdown that supercritical turbine group causes because of tach signal fault and cause the problem of economic loss; actual speed signal processing method while having proposed a kind of supercritical turbine group tach signal fault; can break down at the tach signal detecting in real time; fault was not repaired in the time period of recovery; process rotating speed by method of the present invention; do not shut down, guarantee the normal operation of supercritical turbine group.

Technological scheme of the present invention is: rotating speed processing method when a kind of supercritical turbine group tach signal fault, specifically comprises the steps:

1) actual speed signal fault diagnosis:

A: the rotor speed value of establishing NT1 (K), NT2 (K), NT3 (K) and be respectively three speed probe measuring points on same turbine rotor, STNT1, STNT2, STNT3 are respectively the single measuring point condition diagnosing result mark of corresponding NT1 (K), NT2 (K), NT3 (K), STNT i (i=1,2,3) value is 1, represent measuring point fault, if value is 0 o'clock, represent that measuring point is normal, relatively diagnose according to the deviate of two measuring points and threshold value δ:

$\mathrm{STNT}1=\left\{\begin{array}{cc}1,& \left(\right|\mathrm{NT}1\left(K\right)-\mathrm{NT}3\left(K\right)|>\mathrm{\&delta;and}|\mathrm{NT}1\left(K\right)-\mathrm{NT}2\left(K\right)|>\mathrm{\&delta;})\\ 0,& \left(\right|\mathrm{NT}1\left(K\right)-\mathrm{NT}3\left(K\right)|<\mathrm{\&delta;or}|\mathrm{NT}1\left(K\right)-\mathrm{NT}2\left(K\right)|<\mathrm{\&delta;})\end{array}\right.$

$\mathrm{STNT}2=\left\{\begin{array}{cc}1,& \left(\right|\mathrm{NT}2\left(K\right)-\mathrm{NT}3\left(K\right)|>\mathrm{\&delta;and}|\mathrm{NT}2\left(K\right)-\mathrm{NT}1\left(K\right)|>\mathrm{\&delta;})\\ 0,& \left(\right|\mathrm{NT}2\left(K\right)-\mathrm{NT}3\left(K\right)|<\mathrm{\&delta;or}|\mathrm{NT}2\left(K\right)-\mathrm{NT}1\left(K\right)|<\mathrm{\&delta;})\end{array}\right.$

$\mathrm{STNT}3=\left\{\begin{array}{cc}1,& \left(\right|\mathrm{NT}3\left(K\right)-\mathrm{NT}1\left(K\right)|>\mathrm{\&delta;and}|\mathrm{NT}3\left(K\right)-\mathrm{NT}2\left(K\right)|>\mathrm{\&delta;})\\ 0,& \left(\right|\mathrm{NT}3\left(K\right)-\mathrm{NT}1\left(K\right)|<\mathrm{\&delta;or}|\mathrm{NT}3\left(K\right)-\mathrm{NT}2\left(K\right)|<\mathrm{\&delta;})\end{array}\right.$

Wherein threshold value value δ=1rpm;

B: the actual speed signal value of rotating speed control and protection is X (k), corresponding actual speed signal fault diagnosis is masked as NBAD, carries out the judgement of actual speed signal fault according to STNT1, STNT2, STNT3:

NBAD=STNT1×STNT2+STNT2×STNT3+STNT3×STNT1

NBAD value is 1, represents actual speed signal fault, and NBAD value is 0, represents that actual speed signal is normal;

2) speed setting value when actual speed signal fault: when actual speed signal breaks down, be also that NBAD is masked as at 1 o'clock, system speed setting value X _set(k) maintain a cycle actual speed value X (k-1), that is:

X _set(k)=X(k-1)

Wherein, X _set(k) represent corresponding k cycle setting value, X (k-1) represents k-1 cycle actual speed signal value, i.e. the actual speed signal actual speed value in previous sampling period that breaks down;

3) tachometer value when actual speed signal fault: when actual speed signal breaks down, be also that NBAD is masked as at 1 o'clock, now tachometer value is used a cycle actual speed signal value and replaced, and is:

X (k)=X (k-1), the tachometer value that wherein X (k) is fault moment;

4) during tach signal fault is determined and is got rid of, using step 3) the fault moment tachometer value set is as the input of speed regulator.

Beneficial effect of the present invention is: rotating speed processing method when supercritical turbine group tach signal fault of the present invention, the reliability of raising supercritical turbine, reduces the economic loss producing because of rotating speed fault.

Accompanying drawing explanation

Fig. 1 is logic module diagram corresponding function explanation schematic diagram of the present invention;

Fig. 2 is the logic realization schematic diagram of the fault diagnosis algorithm of three tach signals of the present invention;

Fig. 3 is the logic realization schematic diagram of actual speed signal fault diagnosis algorithm of the present invention;

The logic realization schematic diagram of speed setting value-based algorithm when Fig. 4 is actual speed signal fault of the present invention.

Embodiment

Speed setting value function when occurring for actual speed signal fault of complete calculated in setting value output during by actual speed signal fault diagnosis function and tach signal fault.

One, actual speed signal fault diagnosis algorithm

1, the fault diagnosis algorithm of three tach signals

If NT1 (K), NT2 (K), NT3 (K) are respectively the rotor speed value of three speed probe measuring points on same turbine rotor, STNT1, STNT2, STNT3 are respectively the single measuring point condition diagnosing result mark of corresponding NT1 (K), NT2 (K), NT3 (K), STNT i (i=1,2,3) value is 1, represent measuring point fault, if value is 0 o'clock, represent that measuring point is normal, the comparison method of two logics is got in employing three, according to the deviate of two measuring points and threshold value δ comparison, concrete diagnosis algorithm is:

$\mathrm{STNT}1=\left\{\begin{array}{cc}1,& \left(\right|\mathrm{NT}1\left(K\right)-\mathrm{NT}3\left(K\right)|>\mathrm{\&delta;and}|\mathrm{NT}1\left(K\right)-\mathrm{NT}2\left(K\right)|>\mathrm{\&delta;})\\ 0,& \left(\right|\mathrm{NT}1\left(K\right)-\mathrm{NT}3\left(K\right)|<\mathrm{\&delta;or}|\mathrm{NT}1\left(K\right)-\mathrm{NT}2\left(K\right)|<\mathrm{\&delta;})\end{array}\right.$

$\mathrm{STNT}2=\left\{\begin{array}{cc}1,& \left(\right|\mathrm{NT}2\left(K\right)-\mathrm{NT}3\left(K\right)|>\mathrm{\&delta;and}|\mathrm{NT}2\left(K\right)-\mathrm{NT}1\left(K\right)|>\mathrm{\&delta;})\\ 0,& \left(\right|\mathrm{NT}2\left(K\right)-\mathrm{NT}3\left(K\right)|<\mathrm{\&delta;or}|\mathrm{NT}2\left(K\right)-\mathrm{NT}1\left(K\right)|<\mathrm{\&delta;})\end{array}\right.$

$\mathrm{STNT}3=\left\{\begin{array}{cc}1,& \left(\right|\mathrm{NT}3\left(K\right)-\mathrm{NT}1\left(K\right)|>\mathrm{\&delta;and}|\mathrm{NT}3\left(K\right)-\mathrm{NT}2\left(K\right)|>\mathrm{\&delta;})\\ 0,& \left(\right|\mathrm{NT}3\left(K\right)-\mathrm{NT}1\left(K\right)|<\mathrm{\&delta;or}|\mathrm{NT}3\left(K\right)-\mathrm{NT}2\left(K\right)|<\mathrm{\&delta;})\end{array}\right.$

Wherein threshold value value δ=1rpm, NT1 (K), NT2 (K), NT3 (K) subtract each other respectively the deviation that obtains comparing between two, and for STNT1, STNT2, STNT3, in the time that the deviation comparing between two is all greater than threshold value, value is 1; As long as when the deviation comparing between two has one to be less than threshold value, value is 0;

2, actual speed signal fault diagnosis algorithm

Actual speed value for rotating speed control and protection is X (k), and corresponding actual speed signal fault diagnosis is masked as NBAD, and NBAD value is 1; represent actual speed signal fault, if value is, represent that actual speed signal is normal at 0 o'clock; adopt three to get two logics, concrete diagnosis algorithm is:

NBAD=STNT1×STNT2+STNT2×STNT3+STNT3×STNT1。

Two, speed setting value-based algorithm when actual speed signal fault

When actual speed signal breaks down, be also that NBAD is masked as at 1 o'clock, system speed setting value X _set(k) maintain a cycle actual speed value X (k-1), that is:

X _set(k)=X(k-1)

Wherein, X _set(k) represent corresponding k cycle setting value, X (k-1) represents k-1 cycle actual speed value, i.e. the actual speed signal actual speed value in previous sampling period that breaks down.

Three, actual speed signal value algorithm when actual speed signal fault

When actual speed signal breaks down, also being that NBAD is masked as at 1 o'clock, there is the moment in actual speed signal fault, before recovering to trouble signal, the upper cycle actual speed signal value X (k-1) that actual speed signal value occurs by fault replaces, and specific algorithm is:

X(k)=X(k-1)

Speed setting value and actual speed signal value are as two inputs of speed regulator thus, in the rotating speed control stage, can keep the output of regulator constant, keep throttle flow constant, steam turbine is in the maintenance work stage, under the cooperation of diagnostic markers, keep in repair, with the normal state of a control of steam turbine to rotating speed of resuming operation fast.

The corresponding function of logic module diagram shown in contrast Fig. 1 explanation schematic diagram, Fig. 2 is the logic realization schematic diagram of the fault diagnosis algorithm of three tach signals, NT1 (K), NT2 (K), NT3 (K) signal, compare between two by comparison module, export three tunnels respectively to threshold value comparison module, threshold value is δ=1rpm, if higher than threshold value threshold value be relatively output as 1, be instead 0, this output is after negate module, three roads are inputted three or logic module between two, three roads or logic negate output: STNT1, STNT2, STNT3 is respectively three tach signal NT1 (K), NT2 (K), NT3 (K) measuring point condition diagnosing result mark.

The corresponding function of logic module diagram shown in contrast Fig. 1 explanation schematic diagram, the logic realization schematic diagram of actual speed signal fault diagnosis algorithm as shown in Figure 3, STNT1, STNT2, STNT3 input between two with gate logic module phase Yu Hou tri-tunnels output inputs or logic module phase or, output is actual speed signal fault diagnosis mark.

The corresponding function of logic module diagram shown in contrast Fig. 1 explanation schematic diagram, the logic realization schematic diagram of speed setting value-based algorithm when actual speed signal fault as shown in Figure 4, when NBAD is true logic, represent that actual speed signal breaks down, speed setting value value is X (k-1), otherwise speed setting value is exported according to original system speed setting value.

Claims (1)

1. actual speed signal processing method when supercritical turbine group tach signal fault, is characterized in that, specifically comprises the steps:

1) actual speed signal fault diagnosis:

A: the rotor speed value of establishing NT1 (K), NT2 (K), NT3 (K) and be respectively three speed probe measuring points on same turbine rotor, STNT1, STNT2, STNT3 are respectively the single measuring point condition diagnosing result mark of corresponding NT1 (K), NT2 (K), NT3 (K), STNT i (i=1,2,3) value is 1, represent measuring point fault, if value is 0 o'clock, represent that measuring point is normal, relatively diagnose according to the deviate of two measuring points and threshold value δ:

$\mathrm{STNT}1=\left\{\begin{array}{cc}1,& \left(\right|\mathrm{NT}1\left(K\right)-\mathrm{NT}3\left(K\right)|>\mathrm{\&delta;and}|\mathrm{NT}1\left(K\right)-\mathrm{NT}2\left(K\right)|>\mathrm{\&delta;})\\ 0,& \left(\right|\mathrm{NT}1\left(K\right)-\mathrm{NT}3\left(K\right)|<\mathrm{\&delta;or}|\mathrm{NT}1\left(K\right)-\mathrm{NT}2\left(K\right)|<\mathrm{\&delta;})\end{array}\right.$

$\mathrm{STNT}2=\left\{\begin{array}{cc}1,& \left(\right|\mathrm{NT}2\left(K\right)-\mathrm{NT}3\left(K\right)|>\mathrm{\&delta;and}|\mathrm{NT}2\left(K\right)-\mathrm{NT}1\left(K\right)|>\mathrm{\&delta;})\\ 0,& \left(\right|\mathrm{NT}2\left(K\right)-\mathrm{NT}3\left(K\right)|<\mathrm{\&delta;or}|\mathrm{NT}2\left(K\right)-\mathrm{NT}1\left(K\right)|<\mathrm{\&delta;})\end{array}\right.$

$\mathrm{STNT}3=\left\{\begin{array}{cc}1,& \left(\right|\mathrm{NT}3\left(K\right)-\mathrm{NT}1\left(K\right)|>\mathrm{\&delta;and}|\mathrm{NT}3\left(K\right)-\mathrm{NT}2\left(K\right)|>\mathrm{\&delta;})\\ 0,& \left(\right|\mathrm{NT}3\left(K\right)-\mathrm{NT}1\left(K\right)|<\mathrm{\&delta;or}|\mathrm{NT}3\left(K\right)-\mathrm{NT}2\left(K\right)|<\mathrm{\&delta;})\end{array}\right.$

Wherein threshold value value δ=1rpm;

B: the actual speed signal value of rotating speed control and protection is X (k), corresponding actual speed signal fault diagnosis is masked as NBAD, carries out the judgement of actual speed signal fault according to STNT1, STNT2, STNT3:

NBAD=STNT1×STNT2+STNT2×STNT3+STNT3×STNT1

NBAD value is 1, represents actual speed signal fault, and NBAD value is 0, represents that actual speed signal is normal;

2) speed setting value when actual speed signal fault: when actual speed signal breaks down, be also that NBAD is masked as at 1 o'clock, system speed setting value X _set(k) maintain a cycle actual speed value X (k-1), that is:

X _set(k)=X(k-1)

Wherein, X _set(k) represent corresponding k cycle setting value, X (k-1) represents k-1 cycle actual speed signal value, i.e. the actual speed signal actual speed value in previous sampling period that breaks down;

3) actual speed signal value when actual speed signal fault: when actual speed signal breaks down, be also that NBAD is masked as at 1 o'clock, now actual speed signal value is used a cycle actual speed signal value and replaced, and is:

X (k)=X (k-1), the tachometer value that wherein X (k) is fault moment;

4) during tach signal fault is determined and is got rid of, using step 3) the fault moment tachometer value set is as the input of speed regulator.